ENH: Add rudamentary mathematical expression support

13 files changed, 4425 insertions, 3 deletions

diff --git a/Source/CMakeLists.txt b/Source/CMakeLists.txt
index 970d11b9a5..db9035dc38 100644
--- a/Source/CMakeLists.txt
+++ b/Source/CMakeLists.txt
@@ -21,6 +21,7 @@ OPTION(CMAKE_REGENERATE_YACCLEX
   "Regenerate YACC and LEXX files" OFF)
 MARK_AS_ADVANCED(CMAKE_REGENERATE_YACCLEX)
 IF(CMAKE_REGENERATE_YACCLEX)
+  SET(parsersLexers cmCommandArgument cmExpr)
   FIND_PROGRAM(YACC_EXECUTABLE
     NAMES yacc bison
     PATHS /usr/bin
@@ -36,7 +37,7 @@ IF(CMAKE_REGENERATE_YACCLEX)
       SET(BISON_FLAGS "--yacc")
     ENDIF(YACC_EXECUTABLE MATCHES "bison")
     SET(yacc_files)
-    FOREACH(name cmCommandArgument)
+    FOREACH(name ${parsersLexers})
       SET(src "${CMAKE_CURRENT_SOURCE_DIR}/${name}Parser.y")
       SET(dst "${CMAKE_CURRENT_BINARY_DIR}/${name}Parser.cxx")
       SET(hdr "${CMAKE_CURRENT_BINARY_DIR}/${name}ParserTokens.h")
@@ -51,7 +52,7 @@ IF(CMAKE_REGENERATE_YACCLEX)
   ENDIF(YACC_EXECUTABLE)
   IF(FLEX_EXECUTABLE)
     SET(lex_files)
-    FOREACH(name cmCommandArgument)
+    FOREACH(name ${parsersLexers})
       SET(src "${CMAKE_CURRENT_SOURCE_DIR}/${name}Lexer.in.l")
       SET(dst "${CMAKE_CURRENT_BINARY_DIR}/${name}Lexer.cxx")
       SET(hdr "${CMAKE_CURRENT_BINARY_DIR}/${name}Lexer.h")
@@ -98,6 +99,9 @@ SET(SRCS
   cmDocumentation.cxx
   cmDynamicLoader.cxx
   cmDynamicLoader.h
+  cmExprLexer.cxx
+  cmExprParser.cxx
+  cmExprParserHelper.cxx
   cmGeneratedFileStream.cxx
   cmGlob.cxx
   cmGlobalGenerator.cxx
@@ -346,6 +350,16 @@ IF(BUILD_TESTING)
     --build-makeprogram ${MAKEPROGRAM}
     --test-command StringFileTest)
 
+  ADD_TEST(MathTest ${CMAKE_CTEST_COMMAND}
+    --build-and-test 
+    "${CMake_SOURCE_DIR}/Tests/MathTest"
+    "${CMake_BINARY_DIR}/Tests/MathTest"
+    --build-two-config
+    --build-generator ${CMAKE_GENERATOR}
+    --build-project MathTest
+    --build-makeprogram ${MAKEPROGRAM}
+    --test-command MathTestExec)
+
   ADD_TEST(TryCompile ${CMAKE_CTEST_COMMAND}
     --build-and-test
     "${CMake_SOURCE_DIR}/Tests/TryCompile"
diff --git a/Source/cmCommands.cxx b/Source/cmCommands.cxx
index 3d1f3061bb..ec989d4eab 100644
--- a/Source/cmCommands.cxx
+++ b/Source/cmCommands.cxx
@@ -27,6 +27,7 @@
 #include "cmIncludeExternalMSProjectCommand.cxx"
 #include "cmLinkLibrariesCommand.cxx"
 #include "cmLoadCacheCommand.cxx"
+#include "cmMathCommand.cxx"
 #include "cmOutputRequiredFilesCommand.cxx"
 #include "cmRemoveCommand.cxx"
 #include "cmSetDirectoryPropertiesCommand.cxx"
@@ -68,6 +69,7 @@ void GetPredefinedCommands(std::list<cmCommand*>&
   commands.push_back(new cmLinkLibrariesCommand);
   commands.push_back(new cmLoadCacheCommand);
   commands.push_back(new cmLoadCommandCommand);
+  commands.push_back(new cmMathCommand);
   commands.push_back(new cmOutputRequiredFilesCommand);
   commands.push_back(new cmRemoveCommand);
   commands.push_back(new cmSetDirectoryPropertiesCommand);
diff --git a/Source/cmExprLexer.cxx b/Source/cmExprLexer.cxx
new file mode 100644
index 0000000000..a039ccc6b7
--- /dev/null
+++ b/Source/cmExprLexer.cxx
@@ -0,0 +1,1954 @@
+#line 2 "/home/andy/vtk/CMake-bin/Source/cmExprLexer.cxx"
+
+#line 4 "/home/andy/vtk/CMake-bin/Source/cmExprLexer.cxx"
+
+#define  YY_INT_ALIGNED short int
+
+/* A lexical scanner generated by flex */
+
+#define FLEX_SCANNER
+#define YY_FLEX_MAJOR_VERSION 2
+#define YY_FLEX_MINOR_VERSION 5
+#define YY_FLEX_SUBMINOR_VERSION 31
+#if YY_FLEX_SUBMINOR_VERSION > 0
+#define FLEX_BETA
+#endif
+
+/* First, we deal with  platform-specific or compiler-specific issues. */
+
+/* begin standard C headers. */
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <stdlib.h>
+
+/* end standard C headers. */
+
+/* flex integer type definitions */
+
+#ifndef FLEXINT_H
+#define FLEXINT_H
+
+/* C99 systems have <inttypes.h>. Non-C99 systems may or may not. */
+
+#if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
+#include <inttypes.h>
+typedef int8_t flex_int8_t;
+typedef uint8_t flex_uint8_t;
+typedef int16_t flex_int16_t;
+typedef uint16_t flex_uint16_t;
+typedef int32_t flex_int32_t;
+typedef uint32_t flex_uint32_t;
+#else
+typedef signed char flex_int8_t;
+typedef short int flex_int16_t;
+typedef int flex_int32_t;
+typedef unsigned char flex_uint8_t; 
+typedef unsigned short int flex_uint16_t;
+typedef unsigned int flex_uint32_t;
+#endif /* ! C99 */
+
+/* Limits of integral types. */
+#ifndef INT8_MIN
+#define INT8_MIN               (-128)
+#endif
+#ifndef INT16_MIN
+#define INT16_MIN              (-32767-1)
+#endif
+#ifndef INT32_MIN
+#define INT32_MIN              (-2147483647-1)
+#endif
+#ifndef INT8_MAX
+#define INT8_MAX               (127)
+#endif
+#ifndef INT16_MAX
+#define INT16_MAX              (32767)
+#endif
+#ifndef INT32_MAX
+#define INT32_MAX              (2147483647)
+#endif
+#ifndef UINT8_MAX
+#define UINT8_MAX              (255U)
+#endif
+#ifndef UINT16_MAX
+#define UINT16_MAX             (65535U)
+#endif
+#ifndef UINT32_MAX
+#define UINT32_MAX             (4294967295U)
+#endif
+
+#endif /* ! FLEXINT_H */
+
+#ifdef __cplusplus
+
+/* The "const" storage-class-modifier is valid. */
+#define YY_USE_CONST
+
+#else  /* ! __cplusplus */
+
+#if __STDC__
+
+#define YY_USE_CONST
+
+#endif  /* __STDC__ */
+#endif  /* ! __cplusplus */
+
+#ifdef YY_USE_CONST
+#define yyconst const
+#else
+#define yyconst
+#endif
+
+/* Returned upon end-of-file. */
+#define YY_NULL 0
+
+/* Promotes a possibly negative, possibly signed char to an unsigned
+ * integer for use as an array index.  If the signed char is negative,
+ * we want to instead treat it as an 8-bit unsigned char, hence the
+ * double cast.
+ */
+#define YY_SC_TO_UI(c) ((unsigned int) (unsigned char) c)
+
+/* An opaque pointer. */
+#ifndef YY_TYPEDEF_YY_SCANNER_T
+#define YY_TYPEDEF_YY_SCANNER_T
+typedef void* yyscan_t;
+#endif
+
+/* For convenience, these vars (plus the bison vars far below)
+   are macros in the reentrant scanner. */
+#define yyin yyg->yyin_r
+#define yyout yyg->yyout_r
+#define yyextra yyg->yyextra_r
+#define yyleng yyg->yyleng_r
+#define yytext yyg->yytext_r
+#define yylineno (YY_CURRENT_BUFFER_LVALUE->yy_bs_lineno)
+#define yycolumn (YY_CURRENT_BUFFER_LVALUE->yy_bs_column)
+#define yy_flex_debug yyg->yy_flex_debug_r
+
+int cmExpr_yylex_init (yyscan_t* scanner);
+
+/* Enter a start condition.  This macro really ought to take a parameter,
+ * but we do it the disgusting crufty way forced on us by the ()-less
+ * definition of BEGIN.
+ */
+#define BEGIN yyg->yy_start = 1 + 2 *
+
+/* Translate the current start state into a value that can be later handed
+ * to BEGIN to return to the state.  The YYSTATE alias is for lex
+ * compatibility.
+ */
+#define YY_START ((yyg->yy_start - 1) / 2)
+#define YYSTATE YY_START
+
+/* Action number for EOF rule of a given start state. */
+#define YY_STATE_EOF(state) (YY_END_OF_BUFFER + state + 1)
+
+/* Special action meaning "start processing a new file". */
+#define YY_NEW_FILE cmExpr_yyrestart(yyin ,yyscanner )
+
+#define YY_END_OF_BUFFER_CHAR 0
+
+/* Size of default input buffer. */
+#ifndef YY_BUF_SIZE
+#define YY_BUF_SIZE 16384
+#endif
+
+#ifndef YY_TYPEDEF_YY_BUFFER_STATE
+#define YY_TYPEDEF_YY_BUFFER_STATE
+typedef struct yy_buffer_state *YY_BUFFER_STATE;
+#endif
+
+#define EOB_ACT_CONTINUE_SCAN 0
+#define EOB_ACT_END_OF_FILE 1
+#define EOB_ACT_LAST_MATCH 2
+
+    #define YY_LESS_LINENO(n)
+    
+/* Return all but the first "n" matched characters back to the input stream. */
+#define yyless(n) \
+  do \
+    { \
+    /* Undo effects of setting up yytext. */ \
+        int yyless_macro_arg = (n); \
+        YY_LESS_LINENO(yyless_macro_arg);\
+    *yy_cp = yyg->yy_hold_char; \
+    YY_RESTORE_YY_MORE_OFFSET \
+    yyg->yy_c_buf_p = yy_cp = yy_bp + yyless_macro_arg - YY_MORE_ADJ; \
+    YY_DO_BEFORE_ACTION; /* set up yytext again */ \
+    } \
+  while ( 0 )
+
+/* The following is because we cannot portably get our hands on size_t
+ * (without autoconf's help, which isn't available because we want
+ * flex-generated scanners to compile on their own).
+ */
+
+#ifndef YY_TYPEDEF_YY_SIZE_T
+#define YY_TYPEDEF_YY_SIZE_T
+typedef unsigned int yy_size_t;
+#endif
+
+#ifndef YY_STRUCT_YY_BUFFER_STATE
+#define YY_STRUCT_YY_BUFFER_STATE
+struct yy_buffer_state
+  {
+  FILE *yy_input_file;
+
+  char *yy_ch_buf;    /* input buffer */
+  char *yy_buf_pos;    /* current position in input buffer */
+
+  /* Size of input buffer in bytes, not including room for EOB
+   * characters.
+   */
+  yy_size_t yy_buf_size;
+
+  /* Number of characters read into yy_ch_buf, not including EOB
+   * characters.
+   */
+  int yy_n_chars;
+
+  /* Whether we "own" the buffer - i.e., we know we created it,
+   * and can realloc() it to grow it, and should free() it to
+   * delete it.
+   */
+  int yy_is_our_buffer;
+
+  /* Whether this is an "interactive" input source; if so, and
+   * if we're using stdio for input, then we want to use getc()
+   * instead of fread(), to make sure we stop fetching input after
+   * each newline.
+   */
+  int yy_is_interactive;
+
+  /* Whether we're considered to be at the beginning of a line.
+   * If so, '^' rules will be active on the next match, otherwise
+   * not.
+   */
+  int yy_at_bol;
+
+    int yy_bs_lineno; /**< The line count. */
+    int yy_bs_column; /**< The column count. */
+    
+  /* Whether to try to fill the input buffer when we reach the
+   * end of it.
+   */
+  int yy_fill_buffer;
+
+  int yy_buffer_status;
+
+#define YY_BUFFER_NEW 0
+#define YY_BUFFER_NORMAL 1
+  /* When an EOF's been seen but there's still some text to process
+   * then we mark the buffer as YY_EOF_PENDING, to indicate that we
+   * shouldn't try reading from the input source any more.  We might
+   * still have a bunch of tokens to match, though, because of
+   * possible backing-up.
+   *
+   * When we actually see the EOF, we change the status to "new"
+   * (via cmExpr_yyrestart()), so that the user can continue scanning by
+   * just pointing yyin at a new input file.
+   */
+#define YY_BUFFER_EOF_PENDING 2
+
+  };
+#endif /* !YY_STRUCT_YY_BUFFER_STATE */
+
+/* We provide macros for accessing buffer states in case in the
+ * future we want to put the buffer states in a more general
+ * "scanner state".
+ *
+ * Returns the top of the stack, or NULL.
+ */
+#define YY_CURRENT_BUFFER ( yyg->yy_buffer_stack \
+                          ? yyg->yy_buffer_stack[yyg->yy_buffer_stack_top] \
+                          : NULL)
+
+/* Same as previous macro, but useful when we know that the buffer stack is not
+ * NULL or when we need an lvalue. For internal use only.
+ */
+#define YY_CURRENT_BUFFER_LVALUE yyg->yy_buffer_stack[yyg->yy_buffer_stack_top]
+
+void cmExpr_yyrestart (FILE *input_file ,yyscan_t yyscanner );
+void cmExpr_yy_switch_to_buffer (YY_BUFFER_STATE new_buffer ,yyscan_t yyscanner );
+YY_BUFFER_STATE cmExpr_yy_create_buffer (FILE *file,int size ,yyscan_t yyscanner );
+void cmExpr_yy_delete_buffer (YY_BUFFER_STATE b ,yyscan_t yyscanner );
+void cmExpr_yy_flush_buffer (YY_BUFFER_STATE b ,yyscan_t yyscanner );
+void cmExpr_yypush_buffer_state (YY_BUFFER_STATE new_buffer ,yyscan_t yyscanner );
+void cmExpr_yypop_buffer_state (yyscan_t yyscanner );
+
+static void cmExpr_yyensure_buffer_stack (yyscan_t yyscanner );
+static void cmExpr_yy_load_buffer_state (yyscan_t yyscanner );
+static void cmExpr_yy_init_buffer (YY_BUFFER_STATE b,FILE *file ,yyscan_t yyscanner );
+
+#define YY_FLUSH_BUFFER cmExpr_yy_flush_buffer(YY_CURRENT_BUFFER ,yyscanner)
+
+YY_BUFFER_STATE cmExpr_yy_scan_buffer (char *base,yy_size_t size ,yyscan_t yyscanner );
+YY_BUFFER_STATE cmExpr_yy_scan_string (yyconst char *yy_str ,yyscan_t yyscanner );
+YY_BUFFER_STATE cmExpr_yy_scan_bytes (yyconst char *bytes,int len ,yyscan_t yyscanner );
+
+void *cmExpr_yyalloc (yy_size_t ,yyscan_t yyscanner );
+void *cmExpr_yyrealloc (void *,yy_size_t ,yyscan_t yyscanner );
+void cmExpr_yyfree (void * ,yyscan_t yyscanner );
+
+#define yy_new_buffer cmExpr_yy_create_buffer
+
+#define yy_set_interactive(is_interactive) \
+  { \
+  if ( ! YY_CURRENT_BUFFER ){ \
+        cmExpr_yyensure_buffer_stack (yyscanner); \
+    YY_CURRENT_BUFFER_LVALUE =    \
+            cmExpr_yy_create_buffer(yyin,YY_BUF_SIZE ,yyscanner); \
+  } \
+  YY_CURRENT_BUFFER_LVALUE->yy_is_interactive = is_interactive; \
+  }
+
+#define yy_set_bol(at_bol) \
+  { \
+  if ( ! YY_CURRENT_BUFFER ){\
+        cmExpr_yyensure_buffer_stack (yyscanner); \
+    YY_CURRENT_BUFFER_LVALUE =    \
+            cmExpr_yy_create_buffer(yyin,YY_BUF_SIZE ,yyscanner); \
+  } \
+  YY_CURRENT_BUFFER_LVALUE->yy_at_bol = at_bol; \
+  }
+
+#define YY_AT_BOL() (YY_CURRENT_BUFFER_LVALUE->yy_at_bol)
+
+/* Begin user sect3 */
+
+#define cmExpr_yywrap(n) 1
+#define YY_SKIP_YYWRAP
+
+typedef unsigned char YY_CHAR;
+
+typedef int yy_state_type;
+
+#define yytext_ptr yytext_r
+
+static yy_state_type yy_get_previous_state (yyscan_t yyscanner );
+static yy_state_type yy_try_NUL_trans (yy_state_type current_state  ,yyscan_t yyscanner);
+static int yy_get_next_buffer (yyscan_t yyscanner );
+static void yy_fatal_error (yyconst char msg[] ,yyscan_t yyscanner );
+
+/* Done after the current pattern has been matched and before the
+ * corresponding action - sets up yytext.
+ */
+#define YY_DO_BEFORE_ACTION \
+  yyg->yytext_ptr = yy_bp; \
+  yyleng = (size_t) (yy_cp - yy_bp); \
+  yyg->yy_hold_char = *yy_cp; \
+  *yy_cp = '\0'; \
+  yyg->yy_c_buf_p = yy_cp;
+
+#define YY_NUM_RULES 15
+#define YY_END_OF_BUFFER 16
+/* This struct is not used in this scanner,
+   but its presence is necessary. */
+struct yy_trans_info
+  {
+  flex_int32_t yy_verify;
+  flex_int32_t yy_nxt;
+  };
+static yyconst flex_int16_t yy_accept[23] =
+    {   0,
+        0,    0,   16,   15,    6,    8,   13,   14,    4,    2,
+        3,    5,    1,   15,   15,    9,    7,   10,    1,   11,
+       12,    0
+    } ;
+
+static yyconst flex_int32_t yy_ec[256] =
+    {   0,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    2,    3,    1,    4,
+        5,    6,    7,    1,    8,    1,    9,   10,   10,   10,
+       10,   10,   10,   10,   10,   10,   10,    1,    1,   11,
+        1,   12,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,   13,    1,    1,    1,    1,    1,    1,
+
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,   14,    1,   15,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1
+    } ;
+
+static yyconst flex_int32_t yy_meta[16] =
+    {   0,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1
+    } ;
+
+static yyconst flex_int16_t yy_base[23] =
+    {   0,
+        0,    0,   20,   21,   21,   21,   21,   21,   21,   21,
+       21,   21,    9,    7,    5,   21,   21,   21,    6,   21,
+       21,   21
+    } ;
+
+static yyconst flex_int16_t yy_def[23] =
+    {   0,
+       22,    1,   22,   22,   22,   22,   22,   22,   22,   22,
+       22,   22,   22,   22,   22,   22,   22,   22,   22,   22,
+       22,    0
+    } ;
+
+static yyconst flex_int16_t yy_nxt[37] =
+    {   0,
+        4,    5,    6,    7,    8,    9,   10,   11,   12,   13,
+       14,   15,   16,   17,   18,   19,   21,   20,   19,   22,
+        3,   22,   22,   22,   22,   22,   22,   22,   22,   22,
+       22,   22,   22,   22,   22,   22
+    } ;
+
+static yyconst flex_int16_t yy_chk[37] =
+    {   0,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,   19,   15,   14,   13,    3,
+       22,   22,   22,   22,   22,   22,   22,   22,   22,   22,
+       22,   22,   22,   22,   22,   22
+    } ;
+
+/* The intent behind this definition is that it'll catch
+ * any uses of REJECT which flex missed.
+ */
+#define REJECT reject_used_but_not_detected
+#define yymore() yymore_used_but_not_detected
+#define YY_MORE_ADJ 0
+#define YY_RESTORE_YY_MORE_OFFSET
+#line 1 "/home/andy/vtk/CMake/Source/cmExprLexer.in.l"
+#line 2 "/home/andy/vtk/CMake/Source/cmExprLexer.in.l"
+/*=========================================================================
+
+  Program:   CMake - Cross-Platform Makefile Generator
+  Module:    $RCSfile$
+  Language:  C++
+  Date:      $Date$
+  Version:   $Revision$
+
+  Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
+  See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
+
+     This software is distributed WITHOUT ANY WARRANTY; without even
+     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+     PURPOSE.  See the above copyright notices for more information.
+
+=========================================================================*/
+/*
+
+This file must be translated to C and modified to build everywhere.
+
+Run flex like this:
+
+  flex --prefix=cmExpr_yy --header-file=cmExprLexer.h -ocmExprLexer.cxx cmExprLexer.in.l
+
+Modify cmExprLexer.cxx:
+  - remove TABs
+  - remove "yyscanner" argument from these methods:
+      yy_fatal_error, cmExpr_yyalloc, cmExpr_yyrealloc, cmExpr_yyfree
+  - remove all YY_BREAK lines occurring right after return statements
+  - change while ( 1 ) to for(;;)
+
+Modify cmExprLexer.h:
+  - remove TABs
+  - remove the yy_init_globals function
+  - remove the block that includes unistd.h
+  - remove #line directives (avoids bogus warning on old Sun)
+
+*/
+
+#include "cmExprParserHelper.h"
+
+/* Disable some warnings.  */
+#if defined(_MSC_VER)
+# pragma warning ( disable : 4127 )
+# pragma warning ( disable : 4131 )
+# pragma warning ( disable : 4244 )
+# pragma warning ( disable : 4251 )
+# pragma warning ( disable : 4267 )
+# pragma warning ( disable : 4305 )
+# pragma warning ( disable : 4309 )
+# pragma warning ( disable : 4706 )
+# pragma warning ( disable : 4786 )
+#endif
+
+/* Disable features we do not need. */
+#define YY_NEVER_INTERACTIVE 1
+#undef ECHO /* SGI termios defines this differently. */
+#define ECHO
+
+/* Replace the lexer input function.  */
+#undef YY_INPUT
+#define YY_INPUT(buf, result, max_size) \
+  { result = yyextra->LexInput(buf, max_size); }
+
+/* Include the set of tokens from the parser.  */
+#include "cmExprParserTokens.h"
+
+
+#if defined( _WIN32 ) && !defined( __CYGWIN__ )
+/* Handle Windows properly */
+#  include <io.h>
+#  if defined( _MSC_VER )
+#    define isatty _isatty
+#  endif
+#  define YY_NO_UNISTD_H 1
+#endif
+
+/*--------------------------------------------------------------------------*/
+#line 518 "/home/andy/vtk/CMake-bin/Source/cmExprLexer.cxx"
+
+#define INITIAL 0
+
+#ifndef YY_NO_UNISTD_H
+/* Special case for "unistd.h", since it is non-ANSI. We include it way
+ * down here because we want the user's section 1 to have been scanned first.
+ * The user has a chance to override it with an option.
+ */
+#include <unistd.h>
+#endif
+
+#ifndef YY_EXTRA_TYPE
+#define YY_EXTRA_TYPE void *
+#endif
+
+/* Holds the entire state of the reentrant scanner. */
+struct yyguts_t
+    {
+
+    /* User-defined. Not touched by flex. */
+    YY_EXTRA_TYPE yyextra_r;
+
+    /* The rest are the same as the globals declared in the non-reentrant scanner. */
+    FILE *yyin_r, *yyout_r;
+    size_t yy_buffer_stack_top; /**< index of top of stack. */
+    size_t yy_buffer_stack_max; /**< capacity of stack. */
+    YY_BUFFER_STATE * yy_buffer_stack; /**< Stack as an array. */
+    char yy_hold_char;
+    int yy_n_chars;
+    int yyleng_r;
+    char *yy_c_buf_p;
+    int yy_init;
+    int yy_start;
+    int yy_did_buffer_switch_on_eof;
+    int yy_start_stack_ptr;
+    int yy_start_stack_depth;
+    int *yy_start_stack;
+    yy_state_type yy_last_accepting_state;
+    char* yy_last_accepting_cpos;
+
+    int yylineno_r;
+    int yy_flex_debug_r;
+
+    char *yytext_r;
+    int yy_more_flag;
+    int yy_more_len;
+
+    }; /* end struct yyguts_t */
+
+/* Accessor methods to globals.
+   These are made visible to non-reentrant scanners for convenience. */
+
+int cmExpr_yylex_destroy (yyscan_t yyscanner );
+
+int cmExpr_yyget_debug (yyscan_t yyscanner );
+
+void cmExpr_yyset_debug (int debug_flag ,yyscan_t yyscanner );
+
+YY_EXTRA_TYPE cmExpr_yyget_extra (yyscan_t yyscanner );
+
+void cmExpr_yyset_extra (YY_EXTRA_TYPE user_defined ,yyscan_t yyscanner );
+
+FILE *cmExpr_yyget_in (yyscan_t yyscanner );
+
+void cmExpr_yyset_in  (FILE * in_str ,yyscan_t yyscanner );
+
+FILE *cmExpr_yyget_out (yyscan_t yyscanner );
+
+void cmExpr_yyset_out  (FILE * out_str ,yyscan_t yyscanner );
+
+int cmExpr_yyget_leng (yyscan_t yyscanner );
+
+char *cmExpr_yyget_text (yyscan_t yyscanner );
+
+int cmExpr_yyget_lineno (yyscan_t yyscanner );
+
+void cmExpr_yyset_lineno (int line_number ,yyscan_t yyscanner );
+
+/* Macros after this point can all be overridden by user definitions in
+ * section 1.
+ */
+
+#ifndef YY_SKIP_YYWRAP
+#ifdef __cplusplus
+extern "C" int cmExpr_yywrap (yyscan_t yyscanner );
+#else
+extern int cmExpr_yywrap (yyscan_t yyscanner );
+#endif
+#endif
+
+#ifndef yytext_ptr
+static void yy_flex_strncpy (char *,yyconst char *,int ,yyscan_t yyscanner);
+#endif
+
+#ifdef YY_NEED_STRLEN
+static int yy_flex_strlen (yyconst char * ,yyscan_t yyscanner);
+#endif
+
+#ifndef YY_NO_INPUT
+
+#ifdef __cplusplus
+static int yyinput (yyscan_t yyscanner );
+#else
+static int input (yyscan_t yyscanner );
+#endif
+
+#endif
+
+/* Amount of stuff to slurp up with each read. */
+#ifndef YY_READ_BUF_SIZE
+#define YY_READ_BUF_SIZE 8192
+#endif
+
+/* Copy whatever the last rule matched to the standard output. */
+#ifndef ECHO
+/* This used to be an fputs(), but since the string might contain NUL's,
+ * we now use fwrite().
+ */
+#define ECHO (void) fwrite( yytext, yyleng, 1, yyout )
+#endif
+
+/* Gets input and stuffs it into "buf".  number of characters read, or YY_NULL,
+ * is returned in "result".
+ */
+#ifndef YY_INPUT
+#define YY_INPUT(buf,result,max_size) \
+  if ( YY_CURRENT_BUFFER_LVALUE->yy_is_interactive ) \
+    { \
+    int c = '*'; \
+    size_t n; \
+    for ( n = 0; n < max_size && \
+           (c = getc( yyin )) != EOF && c != '\n'; ++n ) \
+      buf[n] = (char) c; \
+    if ( c == '\n' ) \
+      buf[n++] = (char) c; \
+    if ( c == EOF && ferror( yyin ) ) \
+      YY_FATAL_ERROR( "input in flex scanner failed" ); \
+    result = n; \
+    } \
+  else \
+    { \
+    errno=0; \
+    while ( (result = fread(buf, 1, max_size, yyin))==0 && ferror(yyin)) \
+      { \
+      if( errno != EINTR) \
+        { \
+        YY_FATAL_ERROR( "input in flex scanner failed" ); \
+        break; \
+        } \
+      errno=0; \
+      clearerr(yyin); \
+      } \
+    }\
+\
+
+#endif
+
+/* No semi-colon after return; correct usage is to write "yyterminate();" -
+ * we don't want an extra ';' after the "return" because that will cause
+ * some compilers to complain about unreachable statements.
+ */
+#ifndef yyterminate
+#define yyterminate() return YY_NULL
+#endif
+
+/* Number of entries by which start-condition stack grows. */
+#ifndef YY_START_STACK_INCR
+#define YY_START_STACK_INCR 25
+#endif
+
+/* Report a fatal error. */
+#ifndef YY_FATAL_ERROR
+#define YY_FATAL_ERROR(msg) yy_fatal_error( msg , yyscanner)
+#endif
+
+/* end tables serialization structures and prototypes */
+
+/* Default declaration of generated scanner - a define so the user can
+ * easily add parameters.
+ */
+#ifndef YY_DECL
+#define YY_DECL_IS_OURS 1
+
+extern int cmExpr_yylex (yyscan_t yyscanner);
+
+#define YY_DECL int cmExpr_yylex (yyscan_t yyscanner)
+#endif /* !YY_DECL */
+
+/* Code executed at the beginning of each rule, after yytext and yyleng
+ * have been set up.
+ */
+#ifndef YY_USER_ACTION
+#define YY_USER_ACTION
+#endif
+
+/* Code executed at the end of each rule. */
+#ifndef YY_BREAK
+#define YY_BREAK break;
+#endif
+
+#define YY_RULE_SETUP \
+  YY_USER_ACTION
+
+/** The main scanner function which does all the work.
+ */
+YY_DECL
+{
+  register yy_state_type yy_current_state;
+  register char *yy_cp, *yy_bp;
+  register int yy_act;
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+
+#line 86 "/home/andy/vtk/CMake/Source/cmExprLexer.in.l"
+
+
+#line 736 "/home/andy/vtk/CMake-bin/Source/cmExprLexer.cxx"
+
+  if ( yyg->yy_init )
+    {
+    yyg->yy_init = 0;
+
+#ifdef YY_USER_INIT
+    YY_USER_INIT;
+#endif
+
+    if ( ! yyg->yy_start )
+      yyg->yy_start = 1;  /* first start state */
+
+    if ( ! yyin )
+      yyin = stdin;
+
+    if ( ! yyout )
+      yyout = stdout;
+
+    if ( ! YY_CURRENT_BUFFER ) {
+      cmExpr_yyensure_buffer_stack (yyscanner);
+      YY_CURRENT_BUFFER_LVALUE =
+        cmExpr_yy_create_buffer(yyin,YY_BUF_SIZE ,yyscanner);
+    }
+
+    cmExpr_yy_load_buffer_state(yyscanner );
+    }
+
+  for(;;)    /* loops until end-of-file is reached */
+    {
+    yy_cp = yyg->yy_c_buf_p;
+
+    /* Support of yytext. */
+    *yy_cp = yyg->yy_hold_char;
+
+    /* yy_bp points to the position in yy_ch_buf of the start of
+     * the current run.
+     */
+    yy_bp = yy_cp;
+
+    yy_current_state = yyg->yy_start;
+yy_match:
+    do
+      {
+      register YY_CHAR yy_c = yy_ec[YY_SC_TO_UI(*yy_cp)];
+      if ( yy_accept[yy_current_state] )
+        {
+        yyg->yy_last_accepting_state = yy_current_state;
+        yyg->yy_last_accepting_cpos = yy_cp;
+        }
+      while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )
+        {
+        yy_current_state = (int) yy_def[yy_current_state];
+        if ( yy_current_state >= 23 )
+          yy_c = yy_meta[(unsigned int) yy_c];
+        }
+      yy_current_state = yy_nxt[yy_base[yy_current_state] + (unsigned int) yy_c];
+      ++yy_cp;
+      }
+    while ( yy_base[yy_current_state] != 21 );
+
+yy_find_action:
+    yy_act = yy_accept[yy_current_state];
+    if ( yy_act == 0 )
+      { /* have to back up */
+      yy_cp = yyg->yy_last_accepting_cpos;
+      yy_current_state = yyg->yy_last_accepting_state;
+      yy_act = yy_accept[yy_current_state];
+      }
+
+    YY_DO_BEFORE_ACTION;
+
+do_action:  /* This label is used only to access EOF actions. */
+
+    switch ( yy_act )
+  { /* beginning of action switch */
+      case 0: /* must back up */
+      /* undo the effects of YY_DO_BEFORE_ACTION */
+      *yy_cp = yyg->yy_hold_char;
+      yy_cp = yyg->yy_last_accepting_cpos;
+      yy_current_state = yyg->yy_last_accepting_state;
+      goto yy_find_action;
+
+case 1:
+YY_RULE_SETUP
+#line 88 "/home/andy/vtk/CMake/Source/cmExprLexer.in.l"
+{ yylvalp->Number = atoi(yytext); return exp_NUMBER; } 
+case 2:
+YY_RULE_SETUP
+#line 90 "/home/andy/vtk/CMake/Source/cmExprLexer.in.l"
+{ return exp_PLUS; }
+case 3:
+YY_RULE_SETUP
+#line 91 "/home/andy/vtk/CMake/Source/cmExprLexer.in.l"
+{ return exp_MINUS; } 
+case 4:
+YY_RULE_SETUP
+#line 92 "/home/andy/vtk/CMake/Source/cmExprLexer.in.l"
+{ return exp_TIMES; } 
+case 5:
+YY_RULE_SETUP
+#line 93 "/home/andy/vtk/CMake/Source/cmExprLexer.in.l"
+{ return exp_DIVIDE; } 
+case 6:
+YY_RULE_SETUP
+#line 94 "/home/andy/vtk/CMake/Source/cmExprLexer.in.l"
+{ return exp_MOD; } 
+case 7:
+YY_RULE_SETUP
+#line 95 "/home/andy/vtk/CMake/Source/cmExprLexer.in.l"
+{ return exp_OR; } 
+case 8:
+YY_RULE_SETUP
+#line 96 "/home/andy/vtk/CMake/Source/cmExprLexer.in.l"
+{ return exp_AND; } 
+case 9:
+YY_RULE_SETUP
+#line 97 "/home/andy/vtk/CMake/Source/cmExprLexer.in.l"
+{ return exp_XOR; } 
+case 10:
+YY_RULE_SETUP
+#line 98 "/home/andy/vtk/CMake/Source/cmExprLexer.in.l"
+{ return exp_NOT; } 
+case 11:
+YY_RULE_SETUP
+#line 99 "/home/andy/vtk/CMake/Source/cmExprLexer.in.l"
+{ return exp_SHIFTLEFT; } 
+case 12:
+YY_RULE_SETUP
+#line 100 "/home/andy/vtk/CMake/Source/cmExprLexer.in.l"
+{ return exp_SHIFTRIGHT; } 
+case 13:
+YY_RULE_SETUP
+#line 101 "/home/andy/vtk/CMake/Source/cmExprLexer.in.l"
+{ return exp_OPENPARENT; }
+case 14:
+YY_RULE_SETUP
+#line 102 "/home/andy/vtk/CMake/Source/cmExprLexer.in.l"
+{ return exp_CLOSEPARENT; }
+case 15:
+YY_RULE_SETUP
+#line 104 "/home/andy/vtk/CMake/Source/cmExprLexer.in.l"
+ECHO;
+  YY_BREAK
+#line 894 "/home/andy/vtk/CMake-bin/Source/cmExprLexer.cxx"
+case YY_STATE_EOF(INITIAL):
+  yyterminate();
+
+  case YY_END_OF_BUFFER:
+    {
+    /* Amount of text matched not including the EOB char. */
+    int yy_amount_of_matched_text = (int) (yy_cp - yyg->yytext_ptr) - 1;
+
+    /* Undo the effects of YY_DO_BEFORE_ACTION. */
+    *yy_cp = yyg->yy_hold_char;
+    YY_RESTORE_YY_MORE_OFFSET
+
+    if ( YY_CURRENT_BUFFER_LVALUE->yy_buffer_status == YY_BUFFER_NEW )
+      {
+      /* We're scanning a new file or input source.  It's
+       * possible that this happened because the user
+       * just pointed yyin at a new source and called
+       * cmExpr_yylex().  If so, then we have to assure
+       * consistency between YY_CURRENT_BUFFER and our
+       * globals.  Here is the right place to do so, because
+       * this is the first action (other than possibly a
+       * back-up) that will match for the new input source.
+       */
+      yyg->yy_n_chars = YY_CURRENT_BUFFER_LVALUE->yy_n_chars;
+      YY_CURRENT_BUFFER_LVALUE->yy_input_file = yyin;
+      YY_CURRENT_BUFFER_LVALUE->yy_buffer_status = YY_BUFFER_NORMAL;
+      }
+
+    /* Note that here we test for yy_c_buf_p "<=" to the position
+     * of the first EOB in the buffer, since yy_c_buf_p will
+     * already have been incremented past the NUL character
+     * (since all states make transitions on EOB to the
+     * end-of-buffer state).  Contrast this with the test
+     * in input().
+     */
+    if ( yyg->yy_c_buf_p <= &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[yyg->yy_n_chars] )
+      { /* This was really a NUL. */
+      yy_state_type yy_next_state;
+
+      yyg->yy_c_buf_p = yyg->yytext_ptr + yy_amount_of_matched_text;
+
+      yy_current_state = yy_get_previous_state( yyscanner );
+
+      /* Okay, we're now positioned to make the NUL
+       * transition.  We couldn't have
+       * yy_get_previous_state() go ahead and do it
+       * for us because it doesn't know how to deal
+       * with the possibility of jamming (and we don't
+       * want to build jamming into it because then it
+       * will run more slowly).
+       */
+
+      yy_next_state = yy_try_NUL_trans( yy_current_state , yyscanner);
+
+      yy_bp = yyg->yytext_ptr + YY_MORE_ADJ;
+
+      if ( yy_next_state )
+        {
+        /* Consume the NUL. */
+        yy_cp = ++yyg->yy_c_buf_p;
+        yy_current_state = yy_next_state;
+        goto yy_match;
+        }
+
+      else
+        {
+        yy_cp = yyg->yy_c_buf_p;
+        goto yy_find_action;
+        }
+      }
+
+    else switch ( yy_get_next_buffer( yyscanner ) )
+      {
+      case EOB_ACT_END_OF_FILE:
+        {
+        yyg->yy_did_buffer_switch_on_eof = 0;
+
+        if ( cmExpr_yywrap(yyscanner ) )
+          {
+          /* Note: because we've taken care in
+           * yy_get_next_buffer() to have set up
+           * yytext, we can now set up
+           * yy_c_buf_p so that if some total
+           * hoser (like flex itself) wants to
+           * call the scanner after we return the
+           * YY_NULL, it'll still work - another
+           * YY_NULL will get returned.
+           */
+          yyg->yy_c_buf_p = yyg->yytext_ptr + YY_MORE_ADJ;
+
+          yy_act = YY_STATE_EOF(YY_START);
+          goto do_action;
+          }
+
+        else
+          {
+          if ( ! yyg->yy_did_buffer_switch_on_eof )
+            YY_NEW_FILE;
+          }
+        break;
+        }
+
+      case EOB_ACT_CONTINUE_SCAN:
+        yyg->yy_c_buf_p =
+          yyg->yytext_ptr + yy_amount_of_matched_text;
+
+        yy_current_state = yy_get_previous_state( yyscanner );
+
+        yy_cp = yyg->yy_c_buf_p;
+        yy_bp = yyg->yytext_ptr + YY_MORE_ADJ;
+        goto yy_match;
+
+      case EOB_ACT_LAST_MATCH:
+        yyg->yy_c_buf_p =
+        &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[yyg->yy_n_chars];
+
+        yy_current_state = yy_get_previous_state( yyscanner );
+
+        yy_cp = yyg->yy_c_buf_p;
+        yy_bp = yyg->yytext_ptr + YY_MORE_ADJ;
+        goto yy_find_action;
+      }
+    break;
+    }
+
+  default:
+    YY_FATAL_ERROR(
+      "fatal flex scanner internal error--no action found" );
+  } /* end of action switch */
+    } /* end of scanning one token */
+} /* end of cmExpr_yylex */
+
+/* yy_get_next_buffer - try to read in a new buffer
+ *
+ * Returns a code representing an action:
+ *  EOB_ACT_LAST_MATCH -
+ *  EOB_ACT_CONTINUE_SCAN - continue scanning from current position
+ *  EOB_ACT_END_OF_FILE - end of file
+ */
+static int yy_get_next_buffer (yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+  register char *dest = YY_CURRENT_BUFFER_LVALUE->yy_ch_buf;
+  register char *source = yyg->yytext_ptr;
+  register int number_to_move, i;
+  int ret_val;
+
+  if ( yyg->yy_c_buf_p > &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[yyg->yy_n_chars + 1] )
+    YY_FATAL_ERROR(
+    "fatal flex scanner internal error--end of buffer missed" );
+
+  if ( YY_CURRENT_BUFFER_LVALUE->yy_fill_buffer == 0 )
+    { /* Don't try to fill the buffer, so this is an EOF. */
+    if ( yyg->yy_c_buf_p - yyg->yytext_ptr - YY_MORE_ADJ == 1 )
+      {
+      /* We matched a single character, the EOB, so
+       * treat this as a final EOF.
+       */
+      return EOB_ACT_END_OF_FILE;
+      }
+
+    else
+      {
+      /* We matched some text prior to the EOB, first
+       * process it.
+       */
+      return EOB_ACT_LAST_MATCH;
+      }
+    }
+
+  /* Try to read more data. */
+
+  /* First move last chars to start of buffer. */
+  number_to_move = (int) (yyg->yy_c_buf_p - yyg->yytext_ptr) - 1;
+
+  for ( i = 0; i < number_to_move; ++i )
+    *(dest++) = *(source++);
+
+  if ( YY_CURRENT_BUFFER_LVALUE->yy_buffer_status == YY_BUFFER_EOF_PENDING )
+    /* don't do the read, it's not guaranteed to return an EOF,
+     * just force an EOF
+     */
+    YY_CURRENT_BUFFER_LVALUE->yy_n_chars = yyg->yy_n_chars = 0;
+
+  else
+    {
+      size_t num_to_read =
+      YY_CURRENT_BUFFER_LVALUE->yy_buf_size - number_to_move - 1;
+
+    while ( num_to_read <= 0 )
+      { /* Not enough room in the buffer - grow it. */
+
+      /* just a shorter name for the current buffer */
+      YY_BUFFER_STATE b = YY_CURRENT_BUFFER;
+
+      int yy_c_buf_p_offset =
+        (int) (yyg->yy_c_buf_p - b->yy_ch_buf);
+
+      if ( b->yy_is_our_buffer )
+        {
+        int new_size = b->yy_buf_size * 2;
+
+        if ( new_size <= 0 )
+          b->yy_buf_size += b->yy_buf_size / 8;
+        else
+          b->yy_buf_size *= 2;
+
+        b->yy_ch_buf = (char *)
+          /* Include room in for 2 EOB chars. */
+          cmExpr_yyrealloc((void *) b->yy_ch_buf,b->yy_buf_size + 2 ,yyscanner );
+        }
+      else
+        /* Can't grow it, we don't own it. */
+        b->yy_ch_buf = 0;
+
+      if ( ! b->yy_ch_buf )
+        YY_FATAL_ERROR(
+        "fatal error - scanner input buffer overflow" );
+
+      yyg->yy_c_buf_p = &b->yy_ch_buf[yy_c_buf_p_offset];
+
+      num_to_read = YY_CURRENT_BUFFER_LVALUE->yy_buf_size -
+            number_to_move - 1;
+
+      }
+
+    if ( num_to_read > YY_READ_BUF_SIZE )
+      num_to_read = YY_READ_BUF_SIZE;
+
+    /* Read in more data. */
+    YY_INPUT( (&YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[number_to_move]),
+      yyg->yy_n_chars, num_to_read );
+
+    YY_CURRENT_BUFFER_LVALUE->yy_n_chars = yyg->yy_n_chars;
+    }
+
+  if ( yyg->yy_n_chars == 0 )
+    {
+    if ( number_to_move == YY_MORE_ADJ )
+      {
+      ret_val = EOB_ACT_END_OF_FILE;
+      cmExpr_yyrestart(yyin  ,yyscanner);
+      }
+
+    else
+      {
+      ret_val = EOB_ACT_LAST_MATCH;
+      YY_CURRENT_BUFFER_LVALUE->yy_buffer_status =
+        YY_BUFFER_EOF_PENDING;
+      }
+    }
+
+  else
+    ret_val = EOB_ACT_CONTINUE_SCAN;
+
+  yyg->yy_n_chars += number_to_move;
+  YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[yyg->yy_n_chars] = YY_END_OF_BUFFER_CHAR;
+  YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[yyg->yy_n_chars + 1] = YY_END_OF_BUFFER_CHAR;
+
+  yyg->yytext_ptr = &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[0];
+
+  return ret_val;
+}
+
+/* yy_get_previous_state - get the state just before the EOB char was reached */
+
+    static yy_state_type yy_get_previous_state (yyscan_t yyscanner)
+{
+  register yy_state_type yy_current_state;
+  register char *yy_cp;
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+
+  yy_current_state = yyg->yy_start;
+
+  for ( yy_cp = yyg->yytext_ptr + YY_MORE_ADJ; yy_cp < yyg->yy_c_buf_p; ++yy_cp )
+    {
+    register YY_CHAR yy_c = (*yy_cp ? yy_ec[YY_SC_TO_UI(*yy_cp)] : 1);
+    if ( yy_accept[yy_current_state] )
+      {
+      yyg->yy_last_accepting_state = yy_current_state;
+      yyg->yy_last_accepting_cpos = yy_cp;
+      }
+    while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )
+      {
+      yy_current_state = (int) yy_def[yy_current_state];
+      if ( yy_current_state >= 23 )
+        yy_c = yy_meta[(unsigned int) yy_c];
+      }
+    yy_current_state = yy_nxt[yy_base[yy_current_state] + (unsigned int) yy_c];
+    }
+
+  return yy_current_state;
+}
+
+/* yy_try_NUL_trans - try to make a transition on the NUL character
+ *
+ * synopsis
+ *  next_state = yy_try_NUL_trans( current_state );
+ */
+    static yy_state_type yy_try_NUL_trans  (yy_state_type yy_current_state , yyscan_t yyscanner)
+{
+  register int yy_is_jam;
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+  register char *yy_cp = yyg->yy_c_buf_p;
+
+  register YY_CHAR yy_c = 1;
+  if ( yy_accept[yy_current_state] )
+    {
+    yyg->yy_last_accepting_state = yy_current_state;
+    yyg->yy_last_accepting_cpos = yy_cp;
+    }
+  while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )
+    {
+    yy_current_state = (int) yy_def[yy_current_state];
+    if ( yy_current_state >= 23 )
+      yy_c = yy_meta[(unsigned int) yy_c];
+    }
+  yy_current_state = yy_nxt[yy_base[yy_current_state] + (unsigned int) yy_c];
+  yy_is_jam = (yy_current_state == 22);
+
+  return yy_is_jam ? 0 : yy_current_state;
+}
+
+#ifndef YY_NO_INPUT
+#ifdef __cplusplus
+    static int yyinput (yyscan_t yyscanner)
+#else
+    static int input  (yyscan_t yyscanner)
+#endif
+
+{
+  int c;
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+
+  *yyg->yy_c_buf_p = yyg->yy_hold_char;
+
+  if ( *yyg->yy_c_buf_p == YY_END_OF_BUFFER_CHAR )
+    {
+    /* yy_c_buf_p now points to the character we want to return.
+     * If this occurs *before* the EOB characters, then it's a
+     * valid NUL; if not, then we've hit the end of the buffer.
+     */
+    if ( yyg->yy_c_buf_p < &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[yyg->yy_n_chars] )
+      /* This was really a NUL. */
+      *yyg->yy_c_buf_p = '\0';
+
+    else
+      { /* need more input */
+      int offset = yyg->yy_c_buf_p - yyg->yytext_ptr;
+      ++yyg->yy_c_buf_p;
+
+      switch ( yy_get_next_buffer( yyscanner ) )
+        {
+        case EOB_ACT_LAST_MATCH:
+          /* This happens because yy_g_n_b()
+           * sees that we've accumulated a
+           * token and flags that we need to
+           * try matching the token before
+           * proceeding.  But for input(),
+           * there's no matching to consider.
+           * So convert the EOB_ACT_LAST_MATCH
+           * to EOB_ACT_END_OF_FILE.
+           */
+
+          /* Reset buffer status. */
+          cmExpr_yyrestart(yyin ,yyscanner);
+
+          /*FALLTHROUGH*/
+
+        case EOB_ACT_END_OF_FILE:
+          {
+          if ( cmExpr_yywrap(yyscanner ) )
+            return EOF;
+
+          if ( ! yyg->yy_did_buffer_switch_on_eof )
+            YY_NEW_FILE;
+#ifdef __cplusplus
+          return yyinput(yyscanner);
+#else
+          return input(yyscanner);
+#endif
+          }
+
+        case EOB_ACT_CONTINUE_SCAN:
+          yyg->yy_c_buf_p = yyg->yytext_ptr + offset;
+          break;
+        }
+      }
+    }
+
+  c = *(unsigned char *) yyg->yy_c_buf_p;  /* cast for 8-bit char's */
+  *yyg->yy_c_buf_p = '\0';  /* preserve yytext */
+  yyg->yy_hold_char = *++yyg->yy_c_buf_p;
+
+  return c;
+}
+#endif  /* ifndef YY_NO_INPUT */
+
+/** Immediately switch to a different input stream.
+ * @param input_file A readable stream.
+ * @param yyscanner The scanner object.
+ * @note This function does not reset the start condition to @c INITIAL .
+ */
+    void cmExpr_yyrestart  (FILE * input_file , yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+
+  if ( ! YY_CURRENT_BUFFER ){
+        cmExpr_yyensure_buffer_stack (yyscanner);
+    YY_CURRENT_BUFFER_LVALUE =
+            cmExpr_yy_create_buffer(yyin,YY_BUF_SIZE ,yyscanner);
+  }
+
+  cmExpr_yy_init_buffer(YY_CURRENT_BUFFER,input_file ,yyscanner);
+  cmExpr_yy_load_buffer_state(yyscanner );
+}
+
+/** Switch to a different input buffer.
+ * @param new_buffer The new input buffer.
+ * @param yyscanner The scanner object.
+ */
+    void cmExpr_yy_switch_to_buffer  (YY_BUFFER_STATE  new_buffer , yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+
+  /* TODO. We should be able to replace this entire function body
+   * with
+   *    cmExpr_yypop_buffer_state();
+   *    cmExpr_yypush_buffer_state(new_buffer);
+     */
+  cmExpr_yyensure_buffer_stack (yyscanner);
+  if ( YY_CURRENT_BUFFER == new_buffer )
+    return;
+
+  if ( YY_CURRENT_BUFFER )
+    {
+    /* Flush out information for old buffer. */
+    *yyg->yy_c_buf_p = yyg->yy_hold_char;
+    YY_CURRENT_BUFFER_LVALUE->yy_buf_pos = yyg->yy_c_buf_p;
+    YY_CURRENT_BUFFER_LVALUE->yy_n_chars = yyg->yy_n_chars;
+    }
+
+  YY_CURRENT_BUFFER_LVALUE = new_buffer;
+  cmExpr_yy_load_buffer_state(yyscanner );
+
+  /* We don't actually know whether we did this switch during
+   * EOF (cmExpr_yywrap()) processing, but the only time this flag
+   * is looked at is after cmExpr_yywrap() is called, so it's safe
+   * to go ahead and always set it.
+   */
+  yyg->yy_did_buffer_switch_on_eof = 1;
+}
+
+static void cmExpr_yy_load_buffer_state  (yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+  yyg->yy_n_chars = YY_CURRENT_BUFFER_LVALUE->yy_n_chars;
+  yyg->yytext_ptr = yyg->yy_c_buf_p = YY_CURRENT_BUFFER_LVALUE->yy_buf_pos;
+  yyin = YY_CURRENT_BUFFER_LVALUE->yy_input_file;
+  yyg->yy_hold_char = *yyg->yy_c_buf_p;
+}
+
+/** Allocate and initialize an input buffer state.
+ * @param file A readable stream.
+ * @param size The character buffer size in bytes. When in doubt, use @c YY_BUF_SIZE.
+ * @param yyscanner The scanner object.
+ * @return the allocated buffer state.
+ */
+    YY_BUFFER_STATE cmExpr_yy_create_buffer  (FILE * file, int  size , yyscan_t yyscanner)
+{
+  YY_BUFFER_STATE b;
+    
+  b = (YY_BUFFER_STATE) cmExpr_yyalloc(sizeof( struct yy_buffer_state ) ,yyscanner );
+  if ( ! b )
+    YY_FATAL_ERROR( "out of dynamic memory in cmExpr_yy_create_buffer()" );
+
+  b->yy_buf_size = size;
+
+  /* yy_ch_buf has to be 2 characters longer than the size given because
+   * we need to put in 2 end-of-buffer characters.
+   */
+  b->yy_ch_buf = (char *) cmExpr_yyalloc(b->yy_buf_size + 2 ,yyscanner );
+  if ( ! b->yy_ch_buf )
+    YY_FATAL_ERROR( "out of dynamic memory in cmExpr_yy_create_buffer()" );
+
+  b->yy_is_our_buffer = 1;
+
+  cmExpr_yy_init_buffer(b,file ,yyscanner);
+
+  return b;
+}
+
+/** Destroy the buffer.
+ * @param b a buffer created with cmExpr_yy_create_buffer()
+ * @param yyscanner The scanner object.
+ */
+    void cmExpr_yy_delete_buffer (YY_BUFFER_STATE  b , yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+
+  if ( ! b )
+    return;
+
+  if ( b == YY_CURRENT_BUFFER ) /* Not sure if we should pop here. */
+    YY_CURRENT_BUFFER_LVALUE = (YY_BUFFER_STATE) 0;
+
+  if ( b->yy_is_our_buffer )
+    cmExpr_yyfree((void *) b->yy_ch_buf ,yyscanner );
+
+  cmExpr_yyfree((void *) b ,yyscanner );
+}
+
+#ifndef __cplusplus
+extern int isatty (int );
+#endif /* __cplusplus */
+    
+/* Initializes or reinitializes a buffer.
+ * This function is sometimes called more than once on the same buffer,
+ * such as during a cmExpr_yyrestart() or at EOF.
+ */
+    static void cmExpr_yy_init_buffer  (YY_BUFFER_STATE  b, FILE * file , yyscan_t yyscanner)
+
+{
+  int oerrno = errno;
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+
+  cmExpr_yy_flush_buffer(b ,yyscanner);
+
+  b->yy_input_file = file;
+  b->yy_fill_buffer = 1;
+
+    /* If b is the current buffer, then cmExpr_yy_init_buffer was _probably_
+     * called from cmExpr_yyrestart() or through yy_get_next_buffer.
+     * In that case, we don't want to reset the lineno or column.
+     */
+    if (b != YY_CURRENT_BUFFER){
+        b->yy_bs_lineno = 1;
+        b->yy_bs_column = 0;
+    }
+
+        b->yy_is_interactive = file ? (isatty( fileno(file) ) > 0) : 0;
+    
+  errno = oerrno;
+}
+
+/** Discard all buffered characters. On the next scan, YY_INPUT will be called.
+ * @param b the buffer state to be flushed, usually @c YY_CURRENT_BUFFER.
+ * @param yyscanner The scanner object.
+ */
+    void cmExpr_yy_flush_buffer (YY_BUFFER_STATE  b , yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+  if ( ! b )
+    return;
+
+  b->yy_n_chars = 0;
+
+  /* We always need two end-of-buffer characters.  The first causes
+   * a transition to the end-of-buffer state.  The second causes
+   * a jam in that state.
+   */
+  b->yy_ch_buf[0] = YY_END_OF_BUFFER_CHAR;
+  b->yy_ch_buf[1] = YY_END_OF_BUFFER_CHAR;
+
+  b->yy_buf_pos = &b->yy_ch_buf[0];
+
+  b->yy_at_bol = 1;
+  b->yy_buffer_status = YY_BUFFER_NEW;
+
+  if ( b == YY_CURRENT_BUFFER )
+    cmExpr_yy_load_buffer_state(yyscanner );
+}
+
+/** Pushes the new state onto the stack. The new state becomes
+ *  the current state. This function will allocate the stack
+ *  if necessary.
+ *  @param new_buffer The new state.
+ *  @param yyscanner The scanner object.
+ */
+void cmExpr_yypush_buffer_state (YY_BUFFER_STATE new_buffer , yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+  if (new_buffer == NULL)
+    return;
+
+  cmExpr_yyensure_buffer_stack(yyscanner);
+
+  /* This block is copied from cmExpr_yy_switch_to_buffer. */
+  if ( YY_CURRENT_BUFFER )
+    {
+    /* Flush out information for old buffer. */
+    *yyg->yy_c_buf_p = yyg->yy_hold_char;
+    YY_CURRENT_BUFFER_LVALUE->yy_buf_pos = yyg->yy_c_buf_p;
+    YY_CURRENT_BUFFER_LVALUE->yy_n_chars = yyg->yy_n_chars;
+    }
+
+  /* Only push if top exists. Otherwise, replace top. */
+  if (YY_CURRENT_BUFFER)
+    yyg->yy_buffer_stack_top++;
+  YY_CURRENT_BUFFER_LVALUE = new_buffer;
+
+  /* copied from cmExpr_yy_switch_to_buffer. */
+  cmExpr_yy_load_buffer_state(yyscanner );
+  yyg->yy_did_buffer_switch_on_eof = 1;
+}
+
+/** Removes and deletes the top of the stack, if present.
+ *  The next element becomes the new top.
+ *  @param yyscanner The scanner object.
+ */
+void cmExpr_yypop_buffer_state (yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+  if (!YY_CURRENT_BUFFER)
+    return;
+
+  cmExpr_yy_delete_buffer(YY_CURRENT_BUFFER ,yyscanner);
+  YY_CURRENT_BUFFER_LVALUE = NULL;
+  if (yyg->yy_buffer_stack_top > 0)
+    --yyg->yy_buffer_stack_top;
+
+  if (YY_CURRENT_BUFFER) {
+    cmExpr_yy_load_buffer_state(yyscanner );
+    yyg->yy_did_buffer_switch_on_eof = 1;
+  }
+}
+
+/* Allocates the stack if it does not exist.
+ *  Guarantees space for at least one push.
+ */
+static void cmExpr_yyensure_buffer_stack (yyscan_t yyscanner)
+{
+  int num_to_alloc;
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+
+  if (!yyg->yy_buffer_stack) {
+
+    /* First allocation is just for 2 elements, since we don't know if this
+     * scanner will even need a stack. We use 2 instead of 1 to avoid an
+     * immediate realloc on the next call.
+         */
+    num_to_alloc = 1;
+    yyg->yy_buffer_stack = (struct yy_buffer_state**)cmExpr_yyalloc
+                (num_to_alloc * sizeof(struct yy_buffer_state*)
+                , yyscanner);
+    
+    memset(yyg->yy_buffer_stack, 0, num_to_alloc * sizeof(struct yy_buffer_state*));
+        
+    yyg->yy_buffer_stack_max = num_to_alloc;
+    yyg->yy_buffer_stack_top = 0;
+    return;
+  }
+
+  if (yyg->yy_buffer_stack_top >= (yyg->yy_buffer_stack_max) - 1){
+
+    /* Increase the buffer to prepare for a possible push. */
+    int grow_size = 8 /* arbitrary grow size */;
+
+    num_to_alloc = yyg->yy_buffer_stack_max + grow_size;
+    yyg->yy_buffer_stack = (struct yy_buffer_state**)cmExpr_yyrealloc
+                (yyg->yy_buffer_stack,
+                num_to_alloc * sizeof(struct yy_buffer_state*)
+                , yyscanner);
+
+    /* zero only the new slots.*/
+    memset(yyg->yy_buffer_stack + yyg->yy_buffer_stack_max, 0, grow_size * sizeof(struct yy_buffer_state*));
+    yyg->yy_buffer_stack_max = num_to_alloc;
+  }
+}
+
+/** Setup the input buffer state to scan directly from a user-specified character buffer.
+ * @param base the character buffer
+ * @param size the size in bytes of the character buffer
+ * @param yyscanner The scanner object.
+ * @return the newly allocated buffer state object. 
+ */
+YY_BUFFER_STATE cmExpr_yy_scan_buffer  (char * base, yy_size_t  size , yyscan_t yyscanner)
+{
+  YY_BUFFER_STATE b;
+    
+  if ( size < 2 ||
+       base[size-2] != YY_END_OF_BUFFER_CHAR ||
+       base[size-1] != YY_END_OF_BUFFER_CHAR )
+    /* They forgot to leave room for the EOB's. */
+    return 0;
+
+  b = (YY_BUFFER_STATE) cmExpr_yyalloc(sizeof( struct yy_buffer_state ) ,yyscanner );
+  if ( ! b )
+    YY_FATAL_ERROR( "out of dynamic memory in cmExpr_yy_scan_buffer()" );
+
+  b->yy_buf_size = size - 2;  /* "- 2" to take care of EOB's */
+  b->yy_buf_pos = b->yy_ch_buf = base;
+  b->yy_is_our_buffer = 0;
+  b->yy_input_file = 0;
+  b->yy_n_chars = b->yy_buf_size;
+  b->yy_is_interactive = 0;
+  b->yy_at_bol = 1;
+  b->yy_fill_buffer = 0;
+  b->yy_buffer_status = YY_BUFFER_NEW;
+
+  cmExpr_yy_switch_to_buffer(b ,yyscanner );
+
+  return b;
+}
+
+/** Setup the input buffer state to scan a string. The next call to cmExpr_yylex() will
+ * scan from a @e copy of @a str.
+ * @param str a NUL-terminated string to scan
+ * @param yy_str a NUL-terminated string to scan
+ * @param yyscanner The scanner object.
+ * @return the newly allocated buffer state object.
+ * @note If you want to scan bytes that may contain NUL values, then use
+ *       cmExpr_yy_scan_bytes() instead.
+ */
+YY_BUFFER_STATE cmExpr_yy_scan_string (yyconst char * yy_str , yyscan_t yyscanner)
+{
+    
+  return cmExpr_yy_scan_bytes(yy_str,strlen(yy_str) ,yyscanner);
+}
+
+/** Setup the input buffer state to scan the given bytes. The next call to cmExpr_yylex() will
+ * scan from a @e copy of @a bytes.
+ * @param bytes the byte buffer to scan
+ * @param len the number of bytes in the buffer pointed to by @a bytes.
+ * @param yyscanner The scanner object.
+ * @return the newly allocated buffer state object.
+ */
+YY_BUFFER_STATE cmExpr_yy_scan_bytes  (yyconst char * bytes, int  len , yyscan_t yyscanner)
+{
+  YY_BUFFER_STATE b;
+  char *buf;
+  yy_size_t n;
+  int i;
+    
+  /* Get memory for full buffer, including space for trailing EOB's. */
+  n = len + 2;
+  buf = (char *) cmExpr_yyalloc(n ,yyscanner );
+  if ( ! buf )
+    YY_FATAL_ERROR( "out of dynamic memory in cmExpr_yy_scan_bytes()" );
+
+  for ( i = 0; i < len; ++i )
+    buf[i] = bytes[i];
+
+  buf[len] = buf[len+1] = YY_END_OF_BUFFER_CHAR;
+
+  b = cmExpr_yy_scan_buffer(buf,n ,yyscanner);
+  if ( ! b )
+    YY_FATAL_ERROR( "bad buffer in cmExpr_yy_scan_bytes()" );
+
+  /* It's okay to grow etc. this buffer, and we should throw it
+   * away when we're done.
+   */
+  b->yy_is_our_buffer = 1;
+
+  return b;
+}
+
+#ifndef YY_EXIT_FAILURE
+#define YY_EXIT_FAILURE 2
+#endif
+
+static void yy_fatal_error (yyconst char* msg , yyscan_t)
+{
+      (void) fprintf( stderr, "%s\n", msg );
+  exit( YY_EXIT_FAILURE );
+}
+
+/* Redefine yyless() so it works in section 3 code. */
+
+#undef yyless
+#define yyless(n) \
+  do \
+    { \
+    /* Undo effects of setting up yytext. */ \
+        int yyless_macro_arg = (n); \
+        YY_LESS_LINENO(yyless_macro_arg);\
+    yytext[yyleng] = yyg->yy_hold_char; \
+    yyg->yy_c_buf_p = yytext + yyless_macro_arg; \
+    yyg->yy_hold_char = *yyg->yy_c_buf_p; \
+    *yyg->yy_c_buf_p = '\0'; \
+    yyleng = yyless_macro_arg; \
+    } \
+  while ( 0 )
+
+/* Accessor  methods (get/set functions) to struct members. */
+
+/** Get the user-defined data for this scanner.
+ * @param yyscanner The scanner object.
+ */
+YY_EXTRA_TYPE cmExpr_yyget_extra  (yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+    return yyextra;
+}
+
+/** Get the current line number.
+ * @param yyscanner The scanner object.
+ */
+int cmExpr_yyget_lineno  (yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+    
+        if (! YY_CURRENT_BUFFER)
+            return 0;
+    
+    return yylineno;
+}
+
+/** Get the current column number.
+ * @param yyscanner The scanner object.
+ */
+int cmExpr_yyget_column  (yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+    
+        if (! YY_CURRENT_BUFFER)
+            return 0;
+    
+    return yycolumn;
+}
+
+/** Get the input stream.
+ * @param yyscanner The scanner object.
+ */
+FILE *cmExpr_yyget_in  (yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+    return yyin;
+}
+
+/** Get the output stream.
+ * @param yyscanner The scanner object.
+ */
+FILE *cmExpr_yyget_out  (yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+    return yyout;
+}
+
+/** Get the length of the current token.
+ * @param yyscanner The scanner object.
+ */
+int cmExpr_yyget_leng  (yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+    return yyleng;
+}
+
+/** Get the current token.
+ * @param yyscanner The scanner object.
+ */
+
+char *cmExpr_yyget_text  (yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+    return yytext;
+}
+
+/** Set the user-defined data. This data is never touched by the scanner.
+ * @param user_defined The data to be associated with this scanner.
+ * @param yyscanner The scanner object.
+ */
+void cmExpr_yyset_extra (YY_EXTRA_TYPE  user_defined , yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+    yyextra = user_defined ;
+}
+
+/** Set the current line number.
+ * @param line_number
+ * @param yyscanner The scanner object.
+ */
+void cmExpr_yyset_lineno (int  line_number , yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+
+        /* lineno is only valid if an input buffer exists. */
+        if (! YY_CURRENT_BUFFER )
+           yy_fatal_error( "cmExpr_yyset_lineno called with no buffer" , yyscanner); 
+    
+    yylineno = line_number;
+}
+
+/** Set the current column.
+ * @param line_number
+ * @param yyscanner The scanner object.
+ */
+void cmExpr_yyset_column (int  column_no , yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+
+        /* column is only valid if an input buffer exists. */
+        if (! YY_CURRENT_BUFFER )
+           yy_fatal_error( "cmExpr_yyset_column called with no buffer" , yyscanner); 
+    
+    yycolumn = column_no;
+}
+
+/** Set the input stream. This does not discard the current
+ * input buffer.
+ * @param in_str A readable stream.
+ * @param yyscanner The scanner object.
+ * @see cmExpr_yy_switch_to_buffer
+ */
+void cmExpr_yyset_in (FILE *  in_str , yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+    yyin = in_str ;
+}
+
+void cmExpr_yyset_out (FILE *  out_str , yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+    yyout = out_str ;
+}
+
+int cmExpr_yyget_debug  (yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+    return yy_flex_debug;
+}
+
+void cmExpr_yyset_debug (int  bdebug , yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+    yy_flex_debug = bdebug ;
+}
+
+/* Accessor methods for yylval and yylloc */
+
+static int yy_init_globals (yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+    /* Initialization is the same as for the non-reentrant scanner.
+       This function is called once per scanner lifetime. */
+
+    yyg->yy_buffer_stack = 0;
+    yyg->yy_buffer_stack_top = 0;
+    yyg->yy_buffer_stack_max = 0;
+    yyg->yy_c_buf_p = (char *) 0;
+    yyg->yy_init = 1;
+    yyg->yy_start = 0;
+    yyg->yy_start_stack_ptr = 0;
+    yyg->yy_start_stack_depth = 0;
+    yyg->yy_start_stack = (int *) 0;
+
+/* Defined in main.c */
+#ifdef YY_STDINIT
+    yyin = stdin;
+    yyout = stdout;
+#else
+    yyin = (FILE *) 0;
+    yyout = (FILE *) 0;
+#endif
+
+    /* For future reference: Set errno on error, since we are called by
+     * cmExpr_yylex_init()
+     */
+    return 0;
+}
+
+/* User-visible API */
+
+/* cmExpr_yylex_init is special because it creates the scanner itself, so it is
+ * the ONLY reentrant function that doesn't take the scanner as the last argument.
+ * That's why we explicitly handle the declaration, instead of using our macros.
+ */
+
+int cmExpr_yylex_init(yyscan_t* ptr_yy_globals)
+
+{
+    if (ptr_yy_globals == NULL){
+        errno = EINVAL;
+        return 1;
+    }
+
+    *ptr_yy_globals = (yyscan_t) cmExpr_yyalloc ( sizeof( struct yyguts_t ), NULL );
+
+    if (*ptr_yy_globals == NULL){
+        errno = ENOMEM;
+        return 1;
+    }
+
+    memset(*ptr_yy_globals,0,sizeof(struct yyguts_t));
+
+    return yy_init_globals ( *ptr_yy_globals );
+}
+
+/* cmExpr_yylex_destroy is for both reentrant and non-reentrant scanners. */
+int cmExpr_yylex_destroy  (yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+
+    /* Pop the buffer stack, destroying each element. */
+  while(YY_CURRENT_BUFFER){
+    cmExpr_yy_delete_buffer(YY_CURRENT_BUFFER ,yyscanner );
+    YY_CURRENT_BUFFER_LVALUE = NULL;
+    cmExpr_yypop_buffer_state(yyscanner);
+  }
+
+  /* Destroy the stack itself. */
+  cmExpr_yyfree(yyg->yy_buffer_stack ,yyscanner);
+  yyg->yy_buffer_stack = NULL;
+
+    /* Destroy the start condition stack. */
+        cmExpr_yyfree(yyg->yy_start_stack ,yyscanner );
+        yyg->yy_start_stack = NULL;
+
+    /* Destroy the main struct (reentrant only). */
+    cmExpr_yyfree ( yyscanner , yyscanner );
+    return 0;
+}
+
+/*
+ * Internal utility routines.
+ */
+
+#ifndef yytext_ptr
+static void yy_flex_strncpy (char* s1, yyconst char * s2, int n , yyscan_t yyscanner)
+{
+  register int i;
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+  for ( i = 0; i < n; ++i )
+    s1[i] = s2[i];
+}
+#endif
+
+#ifdef YY_NEED_STRLEN
+static int yy_flex_strlen (yyconst char * s , yyscan_t yyscanner)
+{
+  register int n;
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+  for ( n = 0; s[n]; ++n )
+    ;
+
+  return n;
+}
+#endif
+
+void *cmExpr_yyalloc (yy_size_t  size , yyscan_t)
+{
+  return (void *) malloc( size );
+}
+
+void *cmExpr_yyrealloc  (void * ptr, yy_size_t  size , yyscan_t)
+{
+  /* The cast to (char *) in the following accommodates both
+   * implementations that use char* generic pointers, and those
+   * that use void* generic pointers.  It works with the latter
+   * because both ANSI C and C++ allow castless assignment from
+   * any pointer type to void*, and deal with argument conversions
+   * as though doing an assignment.
+   */
+  return (void *) realloc( (char *) ptr, size );
+}
+
+void cmExpr_yyfree (void * ptr , yyscan_t)
+{
+  free( (char *) ptr );  /* see cmExpr_yyrealloc() for (char *) cast */
+}
+
+#define YYTABLES_NAME "yytables"
+
+#undef YY_NEW_FILE
+#undef YY_FLUSH_BUFFER
+#undef yy_set_bol
+#undef yy_new_buffer
+#undef yy_set_interactive
+#undef yytext_ptr
+#undef YY_DO_BEFORE_ACTION
+
+#ifdef YY_DECL_IS_OURS
+#undef YY_DECL_IS_OURS
+#undef YY_DECL
+#endif
+#line 104 "/home/andy/vtk/CMake/Source/cmExprLexer.in.l"
+
+
+
diff --git a/Source/cmExprLexer.h b/Source/cmExprLexer.h
new file mode 100644
index 0000000000..ce20bfd4e9
--- /dev/null
+++ b/Source/cmExprLexer.h
@@ -0,0 +1,316 @@
+#ifndef cmExpr_yyHEADER_H
+#define cmExpr_yyHEADER_H 1
+#define cmExpr_yyIN_HEADER 1
+
+
+
+
+
+#define  YY_INT_ALIGNED short int
+
+/* A lexical scanner generated by flex */
+
+#define FLEX_SCANNER
+#define YY_FLEX_MAJOR_VERSION 2
+#define YY_FLEX_MINOR_VERSION 5
+#define YY_FLEX_SUBMINOR_VERSION 31
+#if YY_FLEX_SUBMINOR_VERSION > 0
+#define FLEX_BETA
+#endif
+
+/* First, we deal with  platform-specific or compiler-specific issues. */
+
+/* begin standard C headers. */
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <stdlib.h>
+
+/* end standard C headers. */
+
+/* flex integer type definitions */
+
+#ifndef FLEXINT_H
+#define FLEXINT_H
+
+/* C99 systems have <inttypes.h>. Non-C99 systems may or may not. */
+
+#if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
+#include <inttypes.h>
+typedef int8_t flex_int8_t;
+typedef uint8_t flex_uint8_t;
+typedef int16_t flex_int16_t;
+typedef uint16_t flex_uint16_t;
+typedef int32_t flex_int32_t;
+typedef uint32_t flex_uint32_t;
+#else
+typedef signed char flex_int8_t;
+typedef short int flex_int16_t;
+typedef int flex_int32_t;
+typedef unsigned char flex_uint8_t; 
+typedef unsigned short int flex_uint16_t;
+typedef unsigned int flex_uint32_t;
+#endif /* ! C99 */
+
+/* Limits of integral types. */
+#ifndef INT8_MIN
+#define INT8_MIN               (-128)
+#endif
+#ifndef INT16_MIN
+#define INT16_MIN              (-32767-1)
+#endif
+#ifndef INT32_MIN
+#define INT32_MIN              (-2147483647-1)
+#endif
+#ifndef INT8_MAX
+#define INT8_MAX               (127)
+#endif
+#ifndef INT16_MAX
+#define INT16_MAX              (32767)
+#endif
+#ifndef INT32_MAX
+#define INT32_MAX              (2147483647)
+#endif
+#ifndef UINT8_MAX
+#define UINT8_MAX              (255U)
+#endif
+#ifndef UINT16_MAX
+#define UINT16_MAX             (65535U)
+#endif
+#ifndef UINT32_MAX
+#define UINT32_MAX             (4294967295U)
+#endif
+
+#endif /* ! FLEXINT_H */
+
+#ifdef __cplusplus
+
+/* The "const" storage-class-modifier is valid. */
+#define YY_USE_CONST
+
+#else  /* ! __cplusplus */
+
+#if __STDC__
+
+#define YY_USE_CONST
+
+#endif  /* __STDC__ */
+#endif  /* ! __cplusplus */
+
+#ifdef YY_USE_CONST
+#define yyconst const
+#else
+#define yyconst
+#endif
+
+/* An opaque pointer. */
+#ifndef YY_TYPEDEF_YY_SCANNER_T
+#define YY_TYPEDEF_YY_SCANNER_T
+typedef void* yyscan_t;
+#endif
+
+/* For convenience, these vars (plus the bison vars far below)
+   are macros in the reentrant scanner. */
+#define yyin yyg->yyin_r
+#define yyout yyg->yyout_r
+#define yyextra yyg->yyextra_r
+#define yyleng yyg->yyleng_r
+#define yytext yyg->yytext_r
+#define yylineno (YY_CURRENT_BUFFER_LVALUE->yy_bs_lineno)
+#define yycolumn (YY_CURRENT_BUFFER_LVALUE->yy_bs_column)
+#define yy_flex_debug yyg->yy_flex_debug_r
+
+int cmExpr_yylex_init (yyscan_t* scanner);
+
+#ifndef YY_TYPEDEF_YY_BUFFER_STATE
+#define YY_TYPEDEF_YY_BUFFER_STATE
+typedef struct yy_buffer_state *YY_BUFFER_STATE;
+#endif
+
+/* The following is because we cannot portably get our hands on size_t
+ * (without autoconf's help, which isn't available because we want
+ * flex-generated scanners to compile on their own).
+ */
+
+#ifndef YY_TYPEDEF_YY_SIZE_T
+#define YY_TYPEDEF_YY_SIZE_T
+typedef unsigned int yy_size_t;
+#endif
+
+#ifndef YY_STRUCT_YY_BUFFER_STATE
+#define YY_STRUCT_YY_BUFFER_STATE
+struct yy_buffer_state
+  {
+  FILE *yy_input_file;
+
+  char *yy_ch_buf;    /* input buffer */
+  char *yy_buf_pos;    /* current position in input buffer */
+
+  /* Size of input buffer in bytes, not including room for EOB
+   * characters.
+   */
+  yy_size_t yy_buf_size;
+
+  /* Number of characters read into yy_ch_buf, not including EOB
+   * characters.
+   */
+  int yy_n_chars;
+
+  /* Whether we "own" the buffer - i.e., we know we created it,
+   * and can realloc() it to grow it, and should free() it to
+   * delete it.
+   */
+  int yy_is_our_buffer;
+
+  /* Whether this is an "interactive" input source; if so, and
+   * if we're using stdio for input, then we want to use getc()
+   * instead of fread(), to make sure we stop fetching input after
+   * each newline.
+   */
+  int yy_is_interactive;
+
+  /* Whether we're considered to be at the beginning of a line.
+   * If so, '^' rules will be active on the next match, otherwise
+   * not.
+   */
+  int yy_at_bol;
+
+    int yy_bs_lineno; /**< The line count. */
+    int yy_bs_column; /**< The column count. */
+    
+  /* Whether to try to fill the input buffer when we reach the
+   * end of it.
+   */
+  int yy_fill_buffer;
+
+  int yy_buffer_status;
+
+  };
+#endif /* !YY_STRUCT_YY_BUFFER_STATE */
+
+void cmExpr_yyrestart (FILE *input_file ,yyscan_t yyscanner );
+void cmExpr_yy_switch_to_buffer (YY_BUFFER_STATE new_buffer ,yyscan_t yyscanner );
+YY_BUFFER_STATE cmExpr_yy_create_buffer (FILE *file,int size ,yyscan_t yyscanner );
+void cmExpr_yy_delete_buffer (YY_BUFFER_STATE b ,yyscan_t yyscanner );
+void cmExpr_yy_flush_buffer (YY_BUFFER_STATE b ,yyscan_t yyscanner );
+void cmExpr_yypush_buffer_state (YY_BUFFER_STATE new_buffer ,yyscan_t yyscanner );
+void cmExpr_yypop_buffer_state (yyscan_t yyscanner );
+
+YY_BUFFER_STATE cmExpr_yy_scan_buffer (char *base,yy_size_t size ,yyscan_t yyscanner );
+YY_BUFFER_STATE cmExpr_yy_scan_string (yyconst char *yy_str ,yyscan_t yyscanner );
+YY_BUFFER_STATE cmExpr_yy_scan_bytes (yyconst char *bytes,int len ,yyscan_t yyscanner );
+
+void *cmExpr_yyalloc (yy_size_t ,yyscan_t yyscanner );
+void *cmExpr_yyrealloc (void *,yy_size_t ,yyscan_t yyscanner );
+void cmExpr_yyfree (void * ,yyscan_t yyscanner );
+
+/* Begin user sect3 */
+
+#define cmExpr_yywrap(n) 1
+#define YY_SKIP_YYWRAP
+
+#define yytext_ptr yytext_r
+
+#ifdef YY_HEADER_EXPORT_START_CONDITIONS
+#define INITIAL 0
+
+#endif
+
+#ifndef YY_EXTRA_TYPE
+#define YY_EXTRA_TYPE void *
+#endif
+
+/* Accessor methods to globals.
+   These are made visible to non-reentrant scanners for convenience. */
+
+int cmExpr_yylex_destroy (yyscan_t yyscanner );
+
+int cmExpr_yyget_debug (yyscan_t yyscanner );
+
+void cmExpr_yyset_debug (int debug_flag ,yyscan_t yyscanner );
+
+YY_EXTRA_TYPE cmExpr_yyget_extra (yyscan_t yyscanner );
+
+void cmExpr_yyset_extra (YY_EXTRA_TYPE user_defined ,yyscan_t yyscanner );
+
+FILE *cmExpr_yyget_in (yyscan_t yyscanner );
+
+void cmExpr_yyset_in  (FILE * in_str ,yyscan_t yyscanner );
+
+FILE *cmExpr_yyget_out (yyscan_t yyscanner );
+
+void cmExpr_yyset_out  (FILE * out_str ,yyscan_t yyscanner );
+
+int cmExpr_yyget_leng (yyscan_t yyscanner );
+
+char *cmExpr_yyget_text (yyscan_t yyscanner );
+
+int cmExpr_yyget_lineno (yyscan_t yyscanner );
+
+void cmExpr_yyset_lineno (int line_number ,yyscan_t yyscanner );
+
+/* Macros after this point can all be overridden by user definitions in
+ * section 1.
+ */
+
+#ifndef YY_SKIP_YYWRAP
+#ifdef __cplusplus
+extern "C" int cmExpr_yywrap (yyscan_t yyscanner );
+#else
+extern int cmExpr_yywrap (yyscan_t yyscanner );
+#endif
+#endif
+
+#ifndef yytext_ptr
+static void yy_flex_strncpy (char *,yyconst char *,int ,yyscan_t yyscanner);
+#endif
+
+#ifdef YY_NEED_STRLEN
+static int yy_flex_strlen (yyconst char * ,yyscan_t yyscanner);
+#endif
+
+#ifndef YY_NO_INPUT
+
+#endif
+
+/* Amount of stuff to slurp up with each read. */
+#ifndef YY_READ_BUF_SIZE
+#define YY_READ_BUF_SIZE 8192
+#endif
+
+/* Number of entries by which start-condition stack grows. */
+#ifndef YY_START_STACK_INCR
+#define YY_START_STACK_INCR 25
+#endif
+
+/* Default declaration of generated scanner - a define so the user can
+ * easily add parameters.
+ */
+#ifndef YY_DECL
+#define YY_DECL_IS_OURS 1
+
+extern int cmExpr_yylex (yyscan_t yyscanner);
+
+#define YY_DECL int cmExpr_yylex (yyscan_t yyscanner)
+#endif /* !YY_DECL */
+
+/* yy_get_previous_state - get the state just before the EOB char was reached */
+
+#undef YY_NEW_FILE
+#undef YY_FLUSH_BUFFER
+#undef yy_set_bol
+#undef yy_new_buffer
+#undef yy_set_interactive
+#undef yytext_ptr
+#undef YY_DO_BEFORE_ACTION
+
+#ifdef YY_DECL_IS_OURS
+#undef YY_DECL_IS_OURS
+#undef YY_DECL
+#endif
+
+
+
+
+#undef cmExpr_yyIN_HEADER
+#endif /* cmExpr_yyHEADER_H */
diff --git a/Source/cmExprLexer.in.l b/Source/cmExprLexer.in.l
new file mode 100644
index 0000000000..7e6b6cd260
--- /dev/null
+++ b/Source/cmExprLexer.in.l
@@ -0,0 +1,104 @@
+%{
+/*=========================================================================
+
+  Program:   CMake - Cross-Platform Makefile Generator
+  Module:    $RCSfile$
+  Language:  C++
+  Date:      $Date$
+  Version:   $Revision$
+
+  Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
+  See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
+
+     This software is distributed WITHOUT ANY WARRANTY; without even
+     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+     PURPOSE.  See the above copyright notices for more information.
+
+=========================================================================*/
+/*
+
+This file must be translated to C and modified to build everywhere.
+
+Run flex like this:
+
+  flex --prefix=cmExpr_yy --header-file=cmExprLexer.h -ocmExprLexer.cxx cmExprLexer.in.l
+
+Modify cmExprLexer.cxx:
+  - remove TABs
+  - remove "yyscanner" argument from these methods:
+      yy_fatal_error, yyalloc, yyrealloc, yyfree
+  - remove all YY_BREAK lines occurring right after return statements
+  - change while ( 1 ) to for(;;)
+
+Modify cmExprLexer.h:
+  - remove TABs
+  - remove the yy_init_globals function
+  - remove the block that includes unistd.h
+  - remove #line directives (avoids bogus warning on old Sun)
+
+*/
+
+#include "cmExprParserHelper.h"
+
+/* Disable some warnings.  */
+#if defined(_MSC_VER)
+# pragma warning ( disable : 4127 )
+# pragma warning ( disable : 4131 )
+# pragma warning ( disable : 4244 )
+# pragma warning ( disable : 4251 )
+# pragma warning ( disable : 4267 )
+# pragma warning ( disable : 4305 )
+# pragma warning ( disable : 4309 )
+# pragma warning ( disable : 4706 )
+# pragma warning ( disable : 4786 )
+#endif
+
+/* Disable features we do not need. */
+#define YY_NEVER_INTERACTIVE 1
+#undef ECHO /* SGI termios defines this differently. */
+#define ECHO
+
+/* Replace the lexer input function.  */
+#undef YY_INPUT
+#define YY_INPUT(buf, result, max_size) \
+  { result = yyextra->LexInput(buf, max_size); }
+
+/* Include the set of tokens from the parser.  */
+#include "cmExprParserTokens.h"
+
+
+#if defined( _WIN32 ) && !defined( __CYGWIN__ )
+/* Handle Windows properly */
+#  include <io.h>
+#  if defined( _MSC_VER )
+#    define isatty _isatty
+#  endif
+#  define YY_NO_UNISTD_H 1
+#endif
+
+/*--------------------------------------------------------------------------*/
+%}
+
+%option reentrant
+%option noyywrap
+%pointer
+
+%%
+
+[0-9][0-9]* { yylvalp->Number = atoi(yytext); return exp_NUMBER; } 
+
+"+" { return exp_PLUS; }
+"-" { return exp_MINUS; } 
+"*" { return exp_TIMES; } 
+"/" { return exp_DIVIDE; } 
+"%" { return exp_MOD; } 
+"\|" { return exp_OR; } 
+"&" { return exp_AND; } 
+"^" { return exp_XOR; } 
+"~" { return exp_NOT; } 
+"<<" { return exp_SHIFTLEFT; } 
+">>" { return exp_SHIFTRIGHT; } 
+"(" { return exp_OPENPARENT; }
+")" { return exp_CLOSEPARENT; }
+
+%%
diff --git a/Source/cmExprParser.cxx b/Source/cmExprParser.cxx
new file mode 100644
index 0000000000..00b9c5eb73
--- /dev/null
+++ b/Source/cmExprParser.cxx
@@ -0,0 +1,1428 @@
+/* A Bison parser, made by GNU Bison 1.875d.  */
+
+/* Skeleton parser for Yacc-like parsing with Bison,
+   Copyright (C) 1984, 1989, 1990, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+/* As a special exception, when this file is copied by Bison into a
+   Bison output file, you may use that output file without restriction.
+   This special exception was added by the Free Software Foundation
+   in version 1.24 of Bison.  */
+
+/* Written by Richard Stallman by simplifying the original so called
+   ``semantic'' parser.  */
+
+/* All symbols defined below should begin with yy or YY, to avoid
+   infringing on user name space.  This should be done even for local
+   variables, as they might otherwise be expanded by user macros.
+   There are some unavoidable exceptions within include files to
+   define necessary library symbols; they are noted "INFRINGES ON
+   USER NAME SPACE" below.  */
+
+/* Identify Bison output.  */
+#define YYBISON 1
+
+/* Skeleton name.  */
+#define YYSKELETON_NAME "yacc.c"
+
+/* Pure parsers.  */
+#define YYPURE 1
+
+/* Using locations.  */
+#define YYLSP_NEEDED 0
+
+/* If NAME_PREFIX is specified substitute the variables and functions
+   names.  */
+#define yyparse cmExpr_yyparse
+#define yylex   cmExpr_yylex
+#define yyerror cmExpr_yyerror
+#define yylval  cmExpr_yylval
+#define yychar  cmExpr_yychar
+#define yydebug cmExpr_yydebug
+#define yynerrs cmExpr_yynerrs
+
+
+/* Tokens.  */
+#ifndef YYTOKENTYPE
+# define YYTOKENTYPE
+   /* Put the tokens into the symbol table, so that GDB and other debuggers
+      know about them.  */
+   enum yytokentype {
+     exp_PLUS = 258,
+     exp_MINUS = 259,
+     exp_TIMES = 260,
+     exp_DIVIDE = 261,
+     exp_MOD = 262,
+     exp_SHIFTLEFT = 263,
+     exp_SHIFTRIGHT = 264,
+     exp_OPENPARENT = 265,
+     exp_CLOSEPARENT = 266,
+     exp_OR = 267,
+     exp_AND = 268,
+     exp_XOR = 269,
+     exp_NOT = 270,
+     exp_NUMBER = 271
+   };
+#endif
+#define exp_PLUS 258
+#define exp_MINUS 259
+#define exp_TIMES 260
+#define exp_DIVIDE 261
+#define exp_MOD 262
+#define exp_SHIFTLEFT 263
+#define exp_SHIFTRIGHT 264
+#define exp_OPENPARENT 265
+#define exp_CLOSEPARENT 266
+#define exp_OR 267
+#define exp_AND 268
+#define exp_XOR 269
+#define exp_NOT 270
+#define exp_NUMBER 271
+
+
+
+
+/* Copy the first part of user declarations.  */
+#line 1 "/home/andy/vtk/CMake/Source/cmExprParser.y"
+
+/*=========================================================================
+
+  Program:   CMake - Cross-Platform Makefile Generator
+  Module:    $RCSfile$
+  Language:  C++
+  Date:      $Date$
+  Version:   $Revision$
+
+  Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
+  See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
+
+     This software is distributed WITHOUT ANY WARRANTY; without even
+     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+     PURPOSE.  See the above copyright notices for more information.
+
+=========================================================================*/
+/*
+
+This file must be translated to C and modified to build everywhere.
+
+Run bison like this:
+
+  bison --yacc --name-prefix=cmExpr_yy --defines=cmExprParserTokens.h -ocmExprParser.cxx cmExprParser.y
+
+Modify cmExprParser.cxx:
+  - remove TABs
+  - add __HP_aCC to the #if test for yyerrorlab warning suppression
+
+*/
+
+/* Configure the parser to use a lexer object.  */
+#define YYPARSE_PARAM yyscanner
+#define YYLEX_PARAM yyscanner
+#define YYERROR_VERBOSE 1
+#define cmExpr_yyerror(x) \
+        cmExprError(yyscanner, x)
+#define yyGetParser (cmExpr_yyget_extra(yyscanner))
+
+/*-------------------------------------------------------------------------*/
+#include "cmExprParserHelper.h" /* Interface to parser object.  */
+#include "cmExprLexer.h"  /* Interface to lexer object.  */
+#include "cmExprParserTokens.h" /* Need YYSTYPE for YY_DECL.  */
+
+#include <math.h>
+
+/* Forward declare the lexer entry point.  */
+YY_DECL;
+
+/* Internal utility functions.  */
+static void cmExprError(yyscan_t yyscanner, const char* message);
+
+#define YYDEBUG 1
+//#define YYMAXDEPTH 100000
+//#define YYINITDEPTH 10000
+
+
+/* Disable some warnings in the generated code.  */
+#ifdef __BORLANDC__
+# pragma warn -8004 /* Variable assigned a value that is not used.  */
+#endif
+#ifdef _MSC_VER
+# pragma warning (disable: 4102) /* Unused goto label.  */
+# pragma warning (disable: 4065) /* Switch statement contains default but no case. */
+#endif
+
+
+/* Enabling traces.  */
+#ifndef YYDEBUG
+# define YYDEBUG 0
+#endif
+
+/* Enabling verbose error messages.  */
+#ifdef YYERROR_VERBOSE
+# undef YYERROR_VERBOSE
+# define YYERROR_VERBOSE 1
+#else
+# define YYERROR_VERBOSE 0
+#endif
+
+#if ! defined (YYSTYPE) && ! defined (YYSTYPE_IS_DECLARED)
+typedef int YYSTYPE;
+# define yystype YYSTYPE /* obsolescent; will be withdrawn */
+# define YYSTYPE_IS_DECLARED 1
+# define YYSTYPE_IS_TRIVIAL 1
+#endif
+
+
+
+/* Copy the second part of user declarations.  */
+
+
+/* Line 214 of yacc.c.  */
+#line 195 "/home/andy/vtk/CMake-bin/Source/cmExprParser.cxx"
+
+#if ! defined (yyoverflow) || YYERROR_VERBOSE
+
+# ifndef YYFREE
+#  define YYFREE free
+# endif
+# ifndef YYMALLOC
+#  define YYMALLOC malloc
+# endif
+
+/* The parser invokes alloca or malloc; define the necessary symbols.  */
+
+# ifdef YYSTACK_USE_ALLOCA
+#  if YYSTACK_USE_ALLOCA
+#   define YYSTACK_ALLOC alloca
+#  endif
+# else
+#  if defined (alloca) || defined (_ALLOCA_H)
+#   define YYSTACK_ALLOC alloca
+#  else
+#   ifdef __GNUC__
+#    define YYSTACK_ALLOC __builtin_alloca
+#   endif
+#  endif
+# endif
+
+# ifdef YYSTACK_ALLOC
+   /* Pacify GCC's `empty if-body' warning. */
+#  define YYSTACK_FREE(Ptr) do { /* empty */; } while (0)
+# else
+#  if defined (__STDC__) || defined (__cplusplus)
+#   include <stdlib.h> /* INFRINGES ON USER NAME SPACE */
+#   define YYSIZE_T size_t
+#  endif
+#  define YYSTACK_ALLOC YYMALLOC
+#  define YYSTACK_FREE YYFREE
+# endif
+#endif /* ! defined (yyoverflow) || YYERROR_VERBOSE */
+
+
+#if (! defined (yyoverflow) \
+     && (! defined (__cplusplus) \
+   || (defined (YYSTYPE_IS_TRIVIAL) && YYSTYPE_IS_TRIVIAL)))
+
+/* A type that is properly aligned for any stack member.  */
+union yyalloc
+{
+  short int yyss;
+  YYSTYPE yyvs;
+  };
+
+/* The size of the maximum gap between one aligned stack and the next.  */
+# define YYSTACK_GAP_MAXIMUM (sizeof (union yyalloc) - 1)
+
+/* The size of an array large to enough to hold all stacks, each with
+   N elements.  */
+# define YYSTACK_BYTES(N) \
+     ((N) * (sizeof (short int) + sizeof (YYSTYPE))      \
+      + YYSTACK_GAP_MAXIMUM)
+
+/* Copy COUNT objects from FROM to TO.  The source and destination do
+   not overlap.  */
+# ifndef YYCOPY
+#  if defined (__GNUC__) && 1 < __GNUC__
+#   define YYCOPY(To, From, Count) \
+      __builtin_memcpy (To, From, (Count) * sizeof (*(From)))
+#  else
+#   define YYCOPY(To, From, Count)    \
+      do          \
+  {          \
+    register YYSIZE_T yyi;    \
+    for (yyi = 0; yyi < (Count); yyi++)  \
+      (To)[yyi] = (From)[yyi];    \
+  }          \
+      while (0)
+#  endif
+# endif
+
+/* Relocate STACK from its old location to the new one.  The
+   local variables YYSIZE and YYSTACKSIZE give the old and new number of
+   elements in the stack, and YYPTR gives the new location of the
+   stack.  Advance YYPTR to a properly aligned location for the next
+   stack.  */
+# define YYSTACK_RELOCATE(Stack)          \
+    do                  \
+      {                  \
+  YYSIZE_T yynewbytes;            \
+  YYCOPY (&yyptr->Stack, Stack, yysize);        \
+  Stack = &yyptr->Stack;            \
+  yynewbytes = yystacksize * sizeof (*Stack) + YYSTACK_GAP_MAXIMUM; \
+  yyptr += yynewbytes / sizeof (*yyptr);        \
+      }                  \
+    while (0)
+
+#endif
+
+#if defined (__STDC__) || defined (__cplusplus)
+   typedef signed char yysigned_char;
+#else
+   typedef short int yysigned_char;
+#endif
+
+/* YYFINAL -- State number of the termination state. */
+#define YYFINAL  12
+/* YYLAST -- Last index in YYTABLE.  */
+#define YYLAST   25
+
+/* YYNTOKENS -- Number of terminals. */
+#define YYNTOKENS  17
+/* YYNNTS -- Number of nonterminals. */
+#define YYNNTS  9
+/* YYNRULES -- Number of rules. */
+#define YYNRULES  20
+/* YYNRULES -- Number of states. */
+#define YYNSTATES  34
+
+/* YYTRANSLATE(YYLEX) -- Bison symbol number corresponding to YYLEX.  */
+#define YYUNDEFTOK  2
+#define YYMAXUTOK   271
+
+#define YYTRANSLATE(YYX)             \
+  ((unsigned int) (YYX) <= YYMAXUTOK ? yytranslate[YYX] : YYUNDEFTOK)
+
+/* YYTRANSLATE[YYLEX] -- Bison symbol number corresponding to YYLEX.  */
+static const unsigned char yytranslate[] =
+{
+       0,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     1,     2,     3,     4,
+       5,     6,     7,     8,     9,    10,    11,    12,    13,    14,
+      15,    16
+};
+
+#if YYDEBUG
+/* YYPRHS[YYN] -- Index of the first RHS symbol of rule number YYN in
+   YYRHS.  */
+static const unsigned char yyprhs[] =
+{
+       0,     0,     3,     5,     7,    11,    13,    17,    19,    23,
+      25,    29,    33,    35,    39,    43,    47,    49,    53,    57,
+      59
+};
+
+/* YYRHS -- A `-1'-separated list of the rules' RHS. */
+static const yysigned_char yyrhs[] =
+{
+      18,     0,    -1,    19,    -1,    20,    -1,    19,    12,    20,
+      -1,    21,    -1,    20,    14,    21,    -1,    22,    -1,    21,
+      13,    22,    -1,    23,    -1,    22,     3,    23,    -1,    22,
+       4,    23,    -1,    24,    -1,    23,     5,    24,    -1,    23,
+       6,    24,    -1,    23,     7,    24,    -1,    25,    -1,    24,
+       8,    25,    -1,    24,     9,    25,    -1,    16,    -1,    10,
+      19,    11,    -1
+};
+
+/* YYRLINE[YYN] -- source line where rule number YYN was defined.  */
+static const unsigned char yyrline[] =
+{
+       0,    94,    94,   100,   103,   107,   110,   114,   117,   121,
+     124,   127,   131,   134,   137,   140,   144,   147,   150,   155,
+     158
+};
+#endif
+
+#if YYDEBUG || YYERROR_VERBOSE
+/* YYTNME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
+   First, the terminals, then, starting at YYNTOKENS, nonterminals. */
+static const char *const yytname[] =
+{
+  "$end", "error", "$undefined", "exp_PLUS", "exp_MINUS", "exp_TIMES",
+  "exp_DIVIDE", "exp_MOD", "exp_SHIFTLEFT", "exp_SHIFTRIGHT",
+  "exp_OPENPARENT", "exp_CLOSEPARENT", "exp_OR", "exp_AND", "exp_XOR",
+  "exp_NOT", "exp_NUMBER", "$accept", "Start", "exp", "bitwiseor",
+  "bitwisexor", "bitwiseand", "term", "factor", "shift", 0
+};
+#endif
+
+# ifdef YYPRINT
+/* YYTOKNUM[YYLEX-NUM] -- Internal token number corresponding to
+   token YYLEX-NUM.  */
+static const unsigned short int yytoknum[] =
+{
+       0,   256,   257,   258,   259,   260,   261,   262,   263,   264,
+     265,   266,   267,   268,   269,   270,   271
+};
+# endif
+
+/* YYR1[YYN] -- Symbol number of symbol that rule YYN derives.  */
+static const unsigned char yyr1[] =
+{
+       0,    17,    18,    19,    19,    20,    20,    21,    21,    22,
+      22,    22,    23,    23,    23,    23,    24,    24,    24,    25,
+      25
+};
+
+/* YYR2[YYN] -- Number of symbols composing right hand side of rule YYN.  */
+static const unsigned char yyr2[] =
+{
+       0,     2,     1,     1,     3,     1,     3,     1,     3,     1,
+       3,     3,     1,     3,     3,     3,     1,     3,     3,     1,
+       3
+};
+
+/* YYDEFACT[STATE-NAME] -- Default rule to reduce with in state
+   STATE-NUM when YYTABLE doesn't specify something else to do.  Zero
+   means the default is an error.  */
+static const unsigned char yydefact[] =
+{
+       0,     0,    19,     0,     2,     3,     5,     7,     9,    12,
+      16,     0,     1,     0,     0,     0,     0,     0,     0,     0,
+       0,     0,     0,    20,     4,     6,     8,    10,    11,    13,
+      14,    15,    17,    18
+};
+
+/* YYDEFGOTO[NTERM-NUM]. */
+static const yysigned_char yydefgoto[] =
+{
+      -1,     3,     4,     5,     6,     7,     8,     9,    10
+};
+
+/* YYPACT[STATE-NUM] -- Index in YYTABLE of the portion describing
+   STATE-NUM.  */
+#define YYPACT_NINF -12
+static const yysigned_char yypact[] =
+{
+     -10,   -10,   -12,    18,     7,     6,     8,     1,    -4,     2,
+     -12,     3,   -12,   -10,   -10,   -10,   -10,   -10,   -10,   -10,
+     -10,   -10,   -10,   -12,     6,     8,     1,    -4,    -4,     2,
+       2,     2,   -12,   -12
+};
+
+/* YYPGOTO[NTERM-NUM].  */
+static const yysigned_char yypgoto[] =
+{
+     -12,   -12,    21,    10,    11,     9,     0,   -11,    -9
+};
+
+/* YYTABLE[YYPACT[STATE-NUM]].  What to do in state STATE-NUM.  If
+   positive, shift that token.  If negative, reduce the rule which
+   number is the opposite.  If zero, do what YYDEFACT says.
+   If YYTABLE_NINF, syntax error.  */
+#define YYTABLE_NINF -1
+static const unsigned char yytable[] =
+{
+       1,    18,    19,    20,    16,    17,     2,    29,    30,    31,
+      21,    22,    32,    33,    23,    13,    27,    28,    12,    13,
+      14,    15,    11,    24,    26,    25
+};
+
+static const unsigned char yycheck[] =
+{
+      10,     5,     6,     7,     3,     4,    16,    18,    19,    20,
+       8,     9,    21,    22,    11,    12,    16,    17,     0,    12,
+      14,    13,     1,    13,    15,    14
+};
+
+/* YYSTOS[STATE-NUM] -- The (internal number of the) accessing
+   symbol of state STATE-NUM.  */
+static const unsigned char yystos[] =
+{
+       0,    10,    16,    18,    19,    20,    21,    22,    23,    24,
+      25,    19,     0,    12,    14,    13,     3,     4,     5,     6,
+       7,     8,     9,    11,    20,    21,    22,    23,    23,    24,
+      24,    24,    25,    25
+};
+
+#if ! defined (YYSIZE_T) && defined (__SIZE_TYPE__)
+# define YYSIZE_T __SIZE_TYPE__
+#endif
+#if ! defined (YYSIZE_T) && defined (size_t)
+# define YYSIZE_T size_t
+#endif
+#if ! defined (YYSIZE_T)
+# if defined (__STDC__) || defined (__cplusplus)
+#  include <stddef.h> /* INFRINGES ON USER NAME SPACE */
+#  define YYSIZE_T size_t
+# endif
+#endif
+#if ! defined (YYSIZE_T)
+# define YYSIZE_T unsigned int
+#endif
+
+#define yyerrok    (yyerrstatus = 0)
+#define yyclearin  (yychar = YYEMPTY)
+#define YYEMPTY    (-2)
+#define YYEOF    0
+
+#define YYACCEPT  goto yyacceptlab
+#define YYABORT    goto yyabortlab
+#define YYERROR    goto yyerrorlab
+
+
+/* Like YYERROR except do call yyerror.  This remains here temporarily
+   to ease the transition to the new meaning of YYERROR, for GCC.
+   Once GCC version 2 has supplanted version 1, this can go.  */
+
+#define YYFAIL    goto yyerrlab
+
+#define YYRECOVERING()  (!!yyerrstatus)
+
+#define YYBACKUP(Token, Value)          \
+do                \
+  if (yychar == YYEMPTY && yylen == 1)        \
+    {                \
+      yychar = (Token);            \
+      yylval = (Value);            \
+      yytoken = YYTRANSLATE (yychar);        \
+      YYPOPSTACK;            \
+      goto yybackup;            \
+    }                \
+  else                \
+    {                 \
+      yyerror ("syntax error: cannot back up");\
+      YYERROR;              \
+    }                \
+while (0)
+
+#define YYTERROR  1
+#define YYERRCODE  256
+
+/* YYLLOC_DEFAULT -- Compute the default location (before the actions
+   are run).  */
+
+#ifndef YYLLOC_DEFAULT
+# define YYLLOC_DEFAULT(Current, Rhs, N)    \
+   ((Current).first_line   = (Rhs)[1].first_line,  \
+    (Current).first_column = (Rhs)[1].first_column,  \
+    (Current).last_line    = (Rhs)[N].last_line,  \
+    (Current).last_column  = (Rhs)[N].last_column)
+#endif
+
+/* YYLEX -- calling `yylex' with the right arguments.  */
+
+#ifdef YYLEX_PARAM
+# define YYLEX yylex (&yylval, YYLEX_PARAM)
+#else
+# define YYLEX yylex (&yylval)
+#endif
+
+/* Enable debugging if requested.  */
+#if YYDEBUG
+
+# ifndef YYFPRINTF
+#  include <stdio.h> /* INFRINGES ON USER NAME SPACE */
+#  define YYFPRINTF fprintf
+# endif
+
+# define YYDPRINTF(Args)      \
+do {            \
+  if (yydebug)          \
+    YYFPRINTF Args;        \
+} while (0)
+
+# define YYDSYMPRINT(Args)      \
+do {            \
+  if (yydebug)          \
+    yysymprint Args;        \
+} while (0)
+
+# define YYDSYMPRINTF(Title, Token, Value, Location)    \
+do {                \
+  if (yydebug)              \
+    {                \
+      YYFPRINTF (stderr, "%s ", Title);        \
+      yysymprint (stderr,           \
+                  Token, Value);  \
+      YYFPRINTF (stderr, "\n");          \
+    }                \
+} while (0)
+
+/*------------------------------------------------------------------.
+| yy_stack_print -- Print the state stack from its BOTTOM up to its |
+| TOP (included).                                                   |
+`------------------------------------------------------------------*/
+
+#if defined (__STDC__) || defined (__cplusplus)
+static void
+yy_stack_print (short int *bottom, short int *top)
+#else
+static void
+yy_stack_print (bottom, top)
+    short int *bottom;
+    short int *top;
+#endif
+{
+  YYFPRINTF (stderr, "Stack now");
+  for (/* Nothing. */; bottom <= top; ++bottom)
+    YYFPRINTF (stderr, " %d", *bottom);
+  YYFPRINTF (stderr, "\n");
+}
+
+# define YY_STACK_PRINT(Bottom, Top)        \
+do {                \
+  if (yydebug)              \
+    yy_stack_print ((Bottom), (Top));        \
+} while (0)
+
+
+/*------------------------------------------------.
+| Report that the YYRULE is going to be reduced.  |
+`------------------------------------------------*/
+
+#if defined (__STDC__) || defined (__cplusplus)
+static void
+yy_reduce_print (int yyrule)
+#else
+static void
+yy_reduce_print (yyrule)
+    int yyrule;
+#endif
+{
+  int yyi;
+  unsigned int yylno = yyrline[yyrule];
+  YYFPRINTF (stderr, "Reducing stack by rule %d (line %u), ",
+             yyrule - 1, yylno);
+  /* Print the symbols being reduced, and their result.  */
+  for (yyi = yyprhs[yyrule]; 0 <= yyrhs[yyi]; yyi++)
+    YYFPRINTF (stderr, "%s ", yytname [yyrhs[yyi]]);
+  YYFPRINTF (stderr, "-> %s\n", yytname [yyr1[yyrule]]);
+}
+
+# define YY_REDUCE_PRINT(Rule)    \
+do {          \
+  if (yydebug)        \
+    yy_reduce_print (Rule);    \
+} while (0)
+
+/* Nonzero means print parse trace.  It is left uninitialized so that
+   multiple parsers can coexist.  */
+int yydebug;
+#else /* !YYDEBUG */
+# define YYDPRINTF(Args)
+# define YYDSYMPRINT(Args)
+# define YYDSYMPRINTF(Title, Token, Value, Location)
+# define YY_STACK_PRINT(Bottom, Top)
+# define YY_REDUCE_PRINT(Rule)
+#endif /* !YYDEBUG */
+
+
+/* YYINITDEPTH -- initial size of the parser's stacks.  */
+#ifndef  YYINITDEPTH
+# define YYINITDEPTH 200
+#endif
+
+/* YYMAXDEPTH -- maximum size the stacks can grow to (effective only
+   if the built-in stack extension method is used).
+
+   Do not make this value too large; the results are undefined if
+   SIZE_MAX < YYSTACK_BYTES (YYMAXDEPTH)
+   evaluated with infinite-precision integer arithmetic.  */
+
+#if defined (YYMAXDEPTH) && YYMAXDEPTH == 0
+# undef YYMAXDEPTH
+#endif
+
+#ifndef YYMAXDEPTH
+# define YYMAXDEPTH 10000
+#endif
+
+
+
+#if YYERROR_VERBOSE
+
+# ifndef yystrlen
+#  if defined (__GLIBC__) && defined (_STRING_H)
+#   define yystrlen strlen
+#  else
+/* Return the length of YYSTR.  */
+static YYSIZE_T
+#   if defined (__STDC__) || defined (__cplusplus)
+yystrlen (const char *yystr)
+#   else
+yystrlen (yystr)
+     const char *yystr;
+#   endif
+{
+  register const char *yys = yystr;
+
+  while (*yys++ != '\0')
+    continue;
+
+  return yys - yystr - 1;
+}
+#  endif
+# endif
+
+# ifndef yystpcpy
+#  if defined (__GLIBC__) && defined (_STRING_H) && defined (_GNU_SOURCE)
+#   define yystpcpy stpcpy
+#  else
+/* Copy YYSRC to YYDEST, returning the address of the terminating '\0' in
+   YYDEST.  */
+static char *
+#   if defined (__STDC__) || defined (__cplusplus)
+yystpcpy (char *yydest, const char *yysrc)
+#   else
+yystpcpy (yydest, yysrc)
+     char *yydest;
+     const char *yysrc;
+#   endif
+{
+  register char *yyd = yydest;
+  register const char *yys = yysrc;
+
+  while ((*yyd++ = *yys++) != '\0')
+    continue;
+
+  return yyd - 1;
+}
+#  endif
+# endif
+
+#endif /* !YYERROR_VERBOSE */
+
+
+
+#if YYDEBUG
+/*--------------------------------.
+| Print this symbol on YYOUTPUT.  |
+`--------------------------------*/
+
+#if defined (__STDC__) || defined (__cplusplus)
+static void
+yysymprint (FILE *yyoutput, int yytype, YYSTYPE *yyvaluep)
+#else
+static void
+yysymprint (yyoutput, yytype, yyvaluep)
+    FILE *yyoutput;
+    int yytype;
+    YYSTYPE *yyvaluep;
+#endif
+{
+  /* Pacify ``unused variable'' warnings.  */
+  (void) yyvaluep;
+
+  if (yytype < YYNTOKENS)
+    {
+      YYFPRINTF (yyoutput, "token %s (", yytname[yytype]);
+# ifdef YYPRINT
+      YYPRINT (yyoutput, yytoknum[yytype], *yyvaluep);
+# endif
+    }
+  else
+    YYFPRINTF (yyoutput, "nterm %s (", yytname[yytype]);
+
+  switch (yytype)
+    {
+      default:
+        break;
+    }
+  YYFPRINTF (yyoutput, ")");
+}
+
+#endif /* ! YYDEBUG */
+/*-----------------------------------------------.
+| Release the memory associated to this symbol.  |
+`-----------------------------------------------*/
+
+#if defined (__STDC__) || defined (__cplusplus)
+static void
+yydestruct (int yytype, YYSTYPE *yyvaluep)
+#else
+static void
+yydestruct (yytype, yyvaluep)
+    int yytype;
+    YYSTYPE *yyvaluep;
+#endif
+{
+  /* Pacify ``unused variable'' warnings.  */
+  (void) yyvaluep;
+
+  switch (yytype)
+    {
+
+      default:
+        break;
+    }
+}
+
+
+/* Prevent warnings from -Wmissing-prototypes.  */
+
+#ifdef YYPARSE_PARAM
+# if defined (__STDC__) || defined (__cplusplus)
+int yyparse (void *YYPARSE_PARAM);
+# else
+int yyparse ();
+# endif
+#else /* ! YYPARSE_PARAM */
+#if defined (__STDC__) || defined (__cplusplus)
+int yyparse (void);
+#else
+int yyparse ();
+#endif
+#endif /* ! YYPARSE_PARAM */
+
+
+
+
+
+
+/*----------.
+| yyparse.  |
+`----------*/
+
+#ifdef YYPARSE_PARAM
+# if defined (__STDC__) || defined (__cplusplus)
+int yyparse (void *YYPARSE_PARAM)
+# else
+int yyparse (YYPARSE_PARAM)
+  void *YYPARSE_PARAM;
+# endif
+#else /* ! YYPARSE_PARAM */
+#if defined (__STDC__) || defined (__cplusplus)
+int
+yyparse (void)
+#else
+int
+yyparse ()
+
+#endif
+#endif
+{
+  /* The lookahead symbol.  */
+int yychar;
+
+/* The semantic value of the lookahead symbol.  */
+YYSTYPE yylval;
+
+/* Number of syntax errors so far.  */
+int yynerrs;
+
+  register int yystate;
+  register int yyn;
+  int yyresult;
+  /* Number of tokens to shift before error messages enabled.  */
+  int yyerrstatus;
+  /* Lookahead token as an internal (translated) token number.  */
+  int yytoken = 0;
+
+  /* Three stacks and their tools:
+     `yyss': related to states,
+     `yyvs': related to semantic values,
+     `yyls': related to locations.
+
+     Refer to the stacks thru separate pointers, to allow yyoverflow
+     to reallocate them elsewhere.  */
+
+  /* The state stack.  */
+  short int yyssa[YYINITDEPTH];
+  short int *yyss = yyssa;
+  register short int *yyssp;
+
+  /* The semantic value stack.  */
+  YYSTYPE yyvsa[YYINITDEPTH];
+  YYSTYPE *yyvs = yyvsa;
+  register YYSTYPE *yyvsp;
+
+
+
+#define YYPOPSTACK   (yyvsp--, yyssp--)
+
+  YYSIZE_T yystacksize = YYINITDEPTH;
+
+  /* The variables used to return semantic value and location from the
+     action routines.  */
+  YYSTYPE yyval;
+
+
+  /* When reducing, the number of symbols on the RHS of the reduced
+     rule.  */
+  int yylen;
+
+  YYDPRINTF ((stderr, "Starting parse\n"));
+
+  yystate = 0;
+  yyerrstatus = 0;
+  yynerrs = 0;
+  yychar = YYEMPTY;    /* Cause a token to be read.  */
+
+  /* Initialize stack pointers.
+     Waste one element of value and location stack
+     so that they stay on the same level as the state stack.
+     The wasted elements are never initialized.  */
+
+  yyssp = yyss;
+  yyvsp = yyvs;
+
+
+  goto yysetstate;
+
+/*------------------------------------------------------------.
+| yynewstate -- Push a new state, which is found in yystate.  |
+`------------------------------------------------------------*/
+ yynewstate:
+  /* In all cases, when you get here, the value and location stacks
+     have just been pushed. so pushing a state here evens the stacks.
+     */
+  yyssp++;
+
+ yysetstate:
+  *yyssp = yystate;
+
+  if (yyss + yystacksize - 1 <= yyssp)
+    {
+      /* Get the current used size of the three stacks, in elements.  */
+      YYSIZE_T yysize = yyssp - yyss + 1;
+
+#ifdef yyoverflow
+      {
+  /* Give user a chance to reallocate the stack. Use copies of
+     these so that the &'s don't force the real ones into
+     memory.  */
+  YYSTYPE *yyvs1 = yyvs;
+  short int *yyss1 = yyss;
+
+
+  /* Each stack pointer address is followed by the size of the
+     data in use in that stack, in bytes.  This used to be a
+     conditional around just the two extra args, but that might
+     be undefined if yyoverflow is a macro.  */
+  yyoverflow ("parser stack overflow",
+        &yyss1, yysize * sizeof (*yyssp),
+        &yyvs1, yysize * sizeof (*yyvsp),
+
+        &yystacksize);
+
+  yyss = yyss1;
+  yyvs = yyvs1;
+      }
+#else /* no yyoverflow */
+# ifndef YYSTACK_RELOCATE
+      goto yyoverflowlab;
+# else
+      /* Extend the stack our own way.  */
+      if (YYMAXDEPTH <= yystacksize)
+  goto yyoverflowlab;
+      yystacksize *= 2;
+      if (YYMAXDEPTH < yystacksize)
+  yystacksize = YYMAXDEPTH;
+
+      {
+  short int *yyss1 = yyss;
+  union yyalloc *yyptr =
+    (union yyalloc *) YYSTACK_ALLOC (YYSTACK_BYTES (yystacksize));
+  if (! yyptr)
+    goto yyoverflowlab;
+  YYSTACK_RELOCATE (yyss);
+  YYSTACK_RELOCATE (yyvs);
+
+#  undef YYSTACK_RELOCATE
+  if (yyss1 != yyssa)
+    YYSTACK_FREE (yyss1);
+      }
+# endif
+#endif /* no yyoverflow */
+
+      yyssp = yyss + yysize - 1;
+      yyvsp = yyvs + yysize - 1;
+
+
+      YYDPRINTF ((stderr, "Stack size increased to %lu\n",
+      (unsigned long int) yystacksize));
+
+      if (yyss + yystacksize - 1 <= yyssp)
+  YYABORT;
+    }
+
+  YYDPRINTF ((stderr, "Entering state %d\n", yystate));
+
+  goto yybackup;
+
+/*-----------.
+| yybackup.  |
+`-----------*/
+yybackup:
+
+/* Do appropriate processing given the current state.  */
+/* Read a lookahead token if we need one and don't already have one.  */
+/* yyresume: */
+
+  /* First try to decide what to do without reference to lookahead token.  */
+
+  yyn = yypact[yystate];
+  if (yyn == YYPACT_NINF)
+    goto yydefault;
+
+  /* Not known => get a lookahead token if don't already have one.  */
+
+  /* YYCHAR is either YYEMPTY or YYEOF or a valid lookahead symbol.  */
+  if (yychar == YYEMPTY)
+    {
+      YYDPRINTF ((stderr, "Reading a token: "));
+      yychar = YYLEX;
+    }
+
+  if (yychar <= YYEOF)
+    {
+      yychar = yytoken = YYEOF;
+      YYDPRINTF ((stderr, "Now at end of input.\n"));
+    }
+  else
+    {
+      yytoken = YYTRANSLATE (yychar);
+      YYDSYMPRINTF ("Next token is", yytoken, &yylval, &yylloc);
+    }
+
+  /* If the proper action on seeing token YYTOKEN is to reduce or to
+     detect an error, take that action.  */
+  yyn += yytoken;
+  if (yyn < 0 || YYLAST < yyn || yycheck[yyn] != yytoken)
+    goto yydefault;
+  yyn = yytable[yyn];
+  if (yyn <= 0)
+    {
+      if (yyn == 0 || yyn == YYTABLE_NINF)
+  goto yyerrlab;
+      yyn = -yyn;
+      goto yyreduce;
+    }
+
+  if (yyn == YYFINAL)
+    YYACCEPT;
+
+  /* Shift the lookahead token.  */
+  YYDPRINTF ((stderr, "Shifting token %s, ", yytname[yytoken]));
+
+  /* Discard the token being shifted unless it is eof.  */
+  if (yychar != YYEOF)
+    yychar = YYEMPTY;
+
+  *++yyvsp = yylval;
+
+
+  /* Count tokens shifted since error; after three, turn off error
+     status.  */
+  if (yyerrstatus)
+    yyerrstatus--;
+
+  yystate = yyn;
+  goto yynewstate;
+
+
+/*-----------------------------------------------------------.
+| yydefault -- do the default action for the current state.  |
+`-----------------------------------------------------------*/
+yydefault:
+  yyn = yydefact[yystate];
+  if (yyn == 0)
+    goto yyerrlab;
+  goto yyreduce;
+
+
+/*-----------------------------.
+| yyreduce -- Do a reduction.  |
+`-----------------------------*/
+yyreduce:
+  /* yyn is the number of a rule to reduce with.  */
+  yylen = yyr2[yyn];
+
+  /* If YYLEN is nonzero, implement the default value of the action:
+     `$$ = $1'.
+
+     Otherwise, the following line sets YYVAL to garbage.
+     This behavior is undocumented and Bison
+     users should not rely upon it.  Assigning to YYVAL
+     unconditionally makes the parser a bit smaller, and it avoids a
+     GCC warning that YYVAL may be used uninitialized.  */
+  yyval = yyvsp[1-yylen];
+
+
+  YY_REDUCE_PRINT (yyn);
+  switch (yyn)
+    {
+        case 2:
+#line 95 "/home/andy/vtk/CMake/Source/cmExprParser.y"
+    {
+  yyGetParser->SetResult(yyvsp[0].Number);
+}
+    break;
+
+  case 3:
+#line 101 "/home/andy/vtk/CMake/Source/cmExprParser.y"
+    {yyval.Number = yyvsp[0].Number;}
+    break;
+
+  case 4:
+#line 104 "/home/andy/vtk/CMake/Source/cmExprParser.y"
+    {yyval.Number = yyvsp[-2].Number | yyvsp[0].Number;}
+    break;
+
+  case 5:
+#line 108 "/home/andy/vtk/CMake/Source/cmExprParser.y"
+    {yyval.Number = yyvsp[0].Number;}
+    break;
+
+  case 6:
+#line 111 "/home/andy/vtk/CMake/Source/cmExprParser.y"
+    {yyval.Number = yyvsp[-2].Number ^ yyvsp[0].Number;}
+    break;
+
+  case 7:
+#line 115 "/home/andy/vtk/CMake/Source/cmExprParser.y"
+    {yyval.Number = yyvsp[0].Number;}
+    break;
+
+  case 8:
+#line 118 "/home/andy/vtk/CMake/Source/cmExprParser.y"
+    {yyval.Number = yyvsp[-2].Number & yyvsp[0].Number;}
+    break;
+
+  case 9:
+#line 122 "/home/andy/vtk/CMake/Source/cmExprParser.y"
+    {yyval.Number = yyvsp[0].Number;}
+    break;
+
+  case 10:
+#line 125 "/home/andy/vtk/CMake/Source/cmExprParser.y"
+    {yyval.Number = yyvsp[-2].Number + yyvsp[0].Number;}
+    break;
+
+  case 11:
+#line 128 "/home/andy/vtk/CMake/Source/cmExprParser.y"
+    {yyval.Number = yyvsp[-2].Number - yyvsp[0].Number;}
+    break;
+
+  case 12:
+#line 132 "/home/andy/vtk/CMake/Source/cmExprParser.y"
+    {yyval.Number = yyvsp[0].Number;}
+    break;
+
+  case 13:
+#line 135 "/home/andy/vtk/CMake/Source/cmExprParser.y"
+    {yyval.Number = yyvsp[-2].Number * yyvsp[0].Number;}
+    break;
+
+  case 14:
+#line 138 "/home/andy/vtk/CMake/Source/cmExprParser.y"
+    {yyval.Number = yyvsp[-2].Number / yyvsp[0].Number;}
+    break;
+
+  case 15:
+#line 141 "/home/andy/vtk/CMake/Source/cmExprParser.y"
+    {yyval.Number = yyvsp[-2].Number % yyvsp[0].Number;}
+    break;
+
+  case 16:
+#line 145 "/home/andy/vtk/CMake/Source/cmExprParser.y"
+    {yyval.Number = yyvsp[0].Number;}
+    break;
+
+  case 17:
+#line 148 "/home/andy/vtk/CMake/Source/cmExprParser.y"
+    {yyval.Number = yyvsp[-2].Number << yyvsp[0].Number;}
+    break;
+
+  case 18:
+#line 151 "/home/andy/vtk/CMake/Source/cmExprParser.y"
+    {yyval.Number = yyvsp[-2].Number >> yyvsp[0].Number;}
+    break;
+
+  case 19:
+#line 156 "/home/andy/vtk/CMake/Source/cmExprParser.y"
+    {yyval.Number = yyvsp[0].Number;}
+    break;
+
+  case 20:
+#line 159 "/home/andy/vtk/CMake/Source/cmExprParser.y"
+    {yyval.Number = yyvsp[-1].Number;}
+    break;
+
+
+    }
+
+/* Line 1010 of yacc.c.  */
+#line 1194 "/home/andy/vtk/CMake-bin/Source/cmExprParser.cxx"
+
+  yyvsp -= yylen;
+  yyssp -= yylen;
+
+
+  YY_STACK_PRINT (yyss, yyssp);
+
+  *++yyvsp = yyval;
+
+
+  /* Now `shift' the result of the reduction.  Determine what state
+     that goes to, based on the state we popped back to and the rule
+     number reduced by.  */
+
+  yyn = yyr1[yyn];
+
+  yystate = yypgoto[yyn - YYNTOKENS] + *yyssp;
+  if (0 <= yystate && yystate <= YYLAST && yycheck[yystate] == *yyssp)
+    yystate = yytable[yystate];
+  else
+    yystate = yydefgoto[yyn - YYNTOKENS];
+
+  goto yynewstate;
+
+
+/*------------------------------------.
+| yyerrlab -- here on detecting error |
+`------------------------------------*/
+yyerrlab:
+  /* If not already recovering from an error, report this error.  */
+  if (!yyerrstatus)
+    {
+      ++yynerrs;
+#if YYERROR_VERBOSE
+      yyn = yypact[yystate];
+
+      if (YYPACT_NINF < yyn && yyn < YYLAST)
+  {
+    YYSIZE_T yysize = 0;
+    int yytype = YYTRANSLATE (yychar);
+    const char* yyprefix;
+    char *yymsg;
+    int yyx;
+
+    /* Start YYX at -YYN if negative to avoid negative indexes in
+       YYCHECK.  */
+    int yyxbegin = yyn < 0 ? -yyn : 0;
+
+    /* Stay within bounds of both yycheck and yytname.  */
+    int yychecklim = YYLAST - yyn;
+    int yyxend = yychecklim < YYNTOKENS ? yychecklim : YYNTOKENS;
+    int yycount = 0;
+
+    yyprefix = ", expecting ";
+    for (yyx = yyxbegin; yyx < yyxend; ++yyx)
+      if (yycheck[yyx + yyn] == yyx && yyx != YYTERROR)
+        {
+    yysize += yystrlen (yyprefix) + yystrlen (yytname [yyx]);
+    yycount += 1;
+    if (yycount == 5)
+      {
+        yysize = 0;
+        break;
+      }
+        }
+    yysize += (sizeof ("syntax error, unexpected ")
+         + yystrlen (yytname[yytype]));
+    yymsg = (char *) YYSTACK_ALLOC (yysize);
+    if (yymsg != 0)
+      {
+        char *yyp = yystpcpy (yymsg, "syntax error, unexpected ");
+        yyp = yystpcpy (yyp, yytname[yytype]);
+
+        if (yycount < 5)
+    {
+      yyprefix = ", expecting ";
+      for (yyx = yyxbegin; yyx < yyxend; ++yyx)
+        if (yycheck[yyx + yyn] == yyx && yyx != YYTERROR)
+          {
+      yyp = yystpcpy (yyp, yyprefix);
+      yyp = yystpcpy (yyp, yytname[yyx]);
+      yyprefix = " or ";
+          }
+    }
+        yyerror (yymsg);
+        YYSTACK_FREE (yymsg);
+      }
+    else
+      yyerror ("syntax error; also virtual memory exhausted");
+  }
+      else
+#endif /* YYERROR_VERBOSE */
+  yyerror ("syntax error");
+    }
+
+
+
+  if (yyerrstatus == 3)
+    {
+      /* If just tried and failed to reuse lookahead token after an
+   error, discard it.  */
+
+      if (yychar <= YYEOF)
+        {
+          /* If at end of input, pop the error token,
+       then the rest of the stack, then return failure.  */
+    if (yychar == YYEOF)
+       for (;;)
+         {
+     YYPOPSTACK;
+     if (yyssp == yyss)
+       YYABORT;
+     YYDSYMPRINTF ("Error: popping", yystos[*yyssp], yyvsp, yylsp);
+     yydestruct (yystos[*yyssp], yyvsp);
+         }
+        }
+      else
+  {
+    YYDSYMPRINTF ("Error: discarding", yytoken, &yylval, &yylloc);
+    yydestruct (yytoken, &yylval);
+    yychar = YYEMPTY;
+
+  }
+    }
+
+  /* Else will try to reuse lookahead token after shifting the error
+     token.  */
+  goto yyerrlab1;
+
+
+/*---------------------------------------------------.
+| yyerrorlab -- error raised explicitly by YYERROR.  |
+`---------------------------------------------------*/
+yyerrorlab:
+
+#if defined( __GNUC__ ) || defined(__HP_aCC)
+  /* Pacify GCC when the user code never invokes YYERROR and the label
+     yyerrorlab therefore never appears in user code.  */
+  if (0)
+     goto yyerrorlab;
+#endif
+
+  yyvsp -= yylen;
+  yyssp -= yylen;
+  yystate = *yyssp;
+  goto yyerrlab1;
+
+
+/*-------------------------------------------------------------.
+| yyerrlab1 -- common code for both syntax error and YYERROR.  |
+`-------------------------------------------------------------*/
+yyerrlab1:
+  yyerrstatus = 3;  /* Each real token shifted decrements this.  */
+
+  for (;;)
+    {
+      yyn = yypact[yystate];
+      if (yyn != YYPACT_NINF)
+  {
+    yyn += YYTERROR;
+    if (0 <= yyn && yyn <= YYLAST && yycheck[yyn] == YYTERROR)
+      {
+        yyn = yytable[yyn];
+        if (0 < yyn)
+    break;
+      }
+  }
+
+      /* Pop the current state because it cannot handle the error token.  */
+      if (yyssp == yyss)
+  YYABORT;
+
+      YYDSYMPRINTF ("Error: popping", yystos[*yyssp], yyvsp, yylsp);
+      yydestruct (yystos[yystate], yyvsp);
+      YYPOPSTACK;
+      yystate = *yyssp;
+      YY_STACK_PRINT (yyss, yyssp);
+    }
+
+  if (yyn == YYFINAL)
+    YYACCEPT;
+
+  YYDPRINTF ((stderr, "Shifting error token, "));
+
+  *++yyvsp = yylval;
+
+
+  yystate = yyn;
+  goto yynewstate;
+
+
+/*-------------------------------------.
+| yyacceptlab -- YYACCEPT comes here.  |
+`-------------------------------------*/
+yyacceptlab:
+  yyresult = 0;
+  goto yyreturn;
+
+/*-----------------------------------.
+| yyabortlab -- YYABORT comes here.  |
+`-----------------------------------*/
+yyabortlab:
+  yyresult = 1;
+  goto yyreturn;
+
+#ifndef yyoverflow
+/*----------------------------------------------.
+| yyoverflowlab -- parser overflow comes here.  |
+`----------------------------------------------*/
+yyoverflowlab:
+  yyerror ("parser stack overflow");
+  yyresult = 2;
+  /* Fall through.  */
+#endif
+
+yyreturn:
+#ifndef yyoverflow
+  if (yyss != yyssa)
+    YYSTACK_FREE (yyss);
+#endif
+  return yyresult;
+}
+
+
+#line 163 "/home/andy/vtk/CMake/Source/cmExprParser.y"
+
+/* End of grammar */
+
+/*--------------------------------------------------------------------------*/
+void cmExprError(yyscan_t yyscanner, const char* message)
+{
+  yyGetParser->Error(message);
+}
+
+
diff --git a/Source/cmExprParser.y b/Source/cmExprParser.y
new file mode 100644
index 0000000000..485972cb13
--- /dev/null
+++ b/Source/cmExprParser.y
@@ -0,0 +1,171 @@
+%{
+/*=========================================================================
+
+  Program:   CMake - Cross-Platform Makefile Generator
+  Module:    $RCSfile$
+  Language:  C++
+  Date:      $Date$
+  Version:   $Revision$
+
+  Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
+  See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
+
+     This software is distributed WITHOUT ANY WARRANTY; without even
+     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+     PURPOSE.  See the above copyright notices for more information.
+
+=========================================================================*/
+/*
+
+This file must be translated to C and modified to build everywhere.
+
+Run bison like this:
+
+  bison --yacc --name-prefix=cmExpr_yy --defines=cmExprParserTokens.h -ocmExprParser.cxx cmExprParser.y
+
+Modify cmExprParser.cxx:
+  - remove TABs
+  - add __HP_aCC to the #if test for yyerrorlab warning suppression
+
+*/
+
+/* Configure the parser to use a lexer object.  */
+#define YYPARSE_PARAM yyscanner
+#define YYLEX_PARAM yyscanner
+#define YYERROR_VERBOSE 1
+#define cmExpr_yyerror(x) \
+        cmExprError(yyscanner, x)
+#define yyGetParser (cmExpr_yyget_extra(yyscanner))
+
+/*-------------------------------------------------------------------------*/
+#include "cmExprParserHelper.h" /* Interface to parser object.  */
+#include "cmExprLexer.h"  /* Interface to lexer object.  */
+#include "cmExprParserTokens.h" /* Need YYSTYPE for YY_DECL.  */
+
+#include <math.h>
+
+/* Forward declare the lexer entry point.  */
+YY_DECL;
+
+/* Internal utility functions.  */
+static void cmExprError(yyscan_t yyscanner, const char* message);
+
+#define YYDEBUG 1
+//#define YYMAXDEPTH 100000
+//#define YYINITDEPTH 10000
+
+
+/* Disable some warnings in the generated code.  */
+#ifdef __BORLANDC__
+# pragma warn -8004 /* Variable assigned a value that is not used.  */
+#endif
+#ifdef _MSC_VER
+# pragma warning (disable: 4102) /* Unused goto label.  */
+# pragma warning (disable: 4065) /* Switch statement contains default but no case. */
+#endif
+%}
+
+/* Generate a reentrant parser object.  */
+%pure_parser
+
+/*-------------------------------------------------------------------------*/
+/* Tokens */
+%token exp_PLUS
+%token exp_MINUS
+%token exp_TIMES
+%token exp_DIVIDE
+%token exp_MOD
+%token exp_SHIFTLEFT
+%token exp_SHIFTRIGHT
+%token exp_OPENPARENT
+%token exp_CLOSEPARENT
+%token exp_OR;
+%token exp_AND;
+%token exp_XOR;
+%token exp_NOT;
+%token exp_NUMBER;
+
+/*-------------------------------------------------------------------------*/
+/* grammar */
+%%
+
+
+Start:
+exp
+{
+  yyGetParser->SetResult($<Number>1);
+}
+
+exp:
+bitwiseor
+{$<Number>$ = $<Number>1;}
+|
+exp exp_OR bitwiseor
+{$<Number>$ = $<Number>1 | $<Number>3;}
+
+bitwiseor:
+bitwisexor
+{$<Number>$ = $<Number>1;}
+|
+bitwiseor exp_XOR bitwisexor
+{$<Number>$ = $<Number>1 ^ $<Number>3;}
+
+bitwisexor:
+bitwiseand
+{$<Number>$ = $<Number>1;}
+|
+bitwisexor exp_AND bitwiseand
+{$<Number>$ = $<Number>1 & $<Number>3;}
+
+bitwiseand:
+term
+{$<Number>$ = $<Number>1;}
+|
+bitwiseand exp_PLUS term
+{$<Number>$ = $<Number>1 + $<Number>3;}
+|
+bitwiseand exp_MINUS term
+{$<Number>$ = $<Number>1 - $<Number>3;}
+
+term:
+factor
+{$<Number>$ = $<Number>1;}
+|
+term exp_TIMES factor
+{$<Number>$ = $<Number>1 * $<Number>3;}
+|
+term exp_DIVIDE factor
+{$<Number>$ = $<Number>1 / $<Number>3;}
+|
+term exp_MOD factor
+{$<Number>$ = $<Number>1 % $<Number>3;}
+
+factor:
+shift
+{$<Number>$ = $<Number>1;}
+|
+factor exp_SHIFTLEFT shift
+{$<Number>$ = $<Number>1 << $<Number>3;}
+|
+factor exp_SHIFTRIGHT shift
+{$<Number>$ = $<Number>1 >> $<Number>3;}
+
+
+shift:
+exp_NUMBER
+{$<Number>$ = $<Number>1;}
+|
+exp_OPENPARENT exp exp_CLOSEPARENT
+{$<Number>$ = $<Number>2;}
+;
+
+
+%%
+/* End of grammar */
+
+/*--------------------------------------------------------------------------*/
+void cmExprError(yyscan_t yyscanner, const char* message)
+{
+  yyGetParser->Error(message);
+}
+
diff --git a/Source/cmExprParserHelper.cxx b/Source/cmExprParserHelper.cxx
new file mode 100644
index 0000000000..2a70bb6dbc
--- /dev/null
+++ b/Source/cmExprParserHelper.cxx
@@ -0,0 +1,133 @@
+/*=========================================================================
+
+  Program:   CMake - Cross-Platform Makefile Generator
+  Module:    $RCSfile$
+  Language:  C++
+  Date:      $Date$
+  Version:   $Revision$
+
+  Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
+  See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
+
+     This software is distributed WITHOUT ANY WARRANTY; without even 
+     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
+     PURPOSE.  See the above copyright notices for more information.
+
+=========================================================================*/
+#include "cmExprParserHelper.h"
+
+#include "cmSystemTools.h"
+#include "cmExprLexer.h"
+
+#include "cmMakefile.h"
+
+int cmExpr_yyparse( yyscan_t yyscanner );
+//
+cmExprParserHelper::cmExprParserHelper()
+{
+  m_FileLine = -1;
+  m_FileName = 0;
+}
+
+
+cmExprParserHelper::~cmExprParserHelper()
+{
+  this->CleanupParser();
+}
+
+void cmExprParserHelper::SetLineFile(long line, const char* file)
+{
+  m_FileLine = line;
+  m_FileName = file;
+}
+
+int cmExprParserHelper::ParseString(const char* str, int verb)
+{
+  if ( !str)
+    {
+    return 0;
+    }
+  //printf("Do some parsing: %s\n", str);
+
+  this->Verbose = verb;
+  this->InputBuffer = str;
+  this->InputBufferPos = 0;
+  this->CurrentLine = 0;
+  
+  m_Result = 0;
+
+  yyscan_t yyscanner;
+  cmExpr_yylex_init(&yyscanner);
+  cmExpr_yyset_extra(this, yyscanner);
+  int res = cmExpr_yyparse(yyscanner);
+  cmExpr_yylex_destroy(yyscanner);
+  if ( res != 0 )
+    {
+    //str << "CAL_Parser returned: " << res << std::endl;
+    //std::cerr << "When parsing: [" << str << "]" << std::endl;
+    return 0;
+    }
+
+  this->CleanupParser();
+
+  if ( Verbose )
+    {
+    std::cerr << "Expanding [" << str << "] produced: [" << m_Result << "]" << std::endl;
+    }
+  return 1;
+}
+
+void cmExprParserHelper::CleanupParser()
+{
+}
+
+int cmExprParserHelper::LexInput(char* buf, int maxlen)
+{
+  //std::cout << "JPLexInput ";
+  //std::cout.write(buf, maxlen);
+  //std::cout << std::endl;
+  if ( maxlen < 1 )
+    {
+    return 0;
+    }
+  if ( this->InputBufferPos < this->InputBuffer.size() )
+    {
+    buf[0] = this->InputBuffer[ this->InputBufferPos++ ];
+    if ( buf[0] == '\n' )
+      {
+      this->CurrentLine ++;
+      }
+    return(1);
+    }
+  else
+    {
+    buf[0] = '\n';
+    return( 0 );
+    }
+}
+
+void cmExprParserHelper::Error(const char* str)
+{
+  unsigned long pos = static_cast<unsigned long>(this->InputBufferPos);
+  //fprintf(stderr, "Argument Parser Error: %s (%lu / Line: %d)\n", str, pos, this->CurrentLine);
+  cmOStringStream ostr;
+  ostr << str << " (" << pos << ")";
+  /*
+  int cc;
+  std::cerr << "String: [";
+  for ( cc = 0; cc < 30 && *(this->InputBuffer.c_str() + this->InputBufferPos + cc);
+    cc ++ )
+    {
+    std::cerr << *(this->InputBuffer.c_str() + this->InputBufferPos + cc);
+    }
+  std::cerr << "]" << std::endl;
+  */
+  m_Error = ostr.str();
+}
+
+void cmExprParserHelper::SetResult(int value)
+{
+  m_Result = value;
+}
+
+
diff --git a/Source/cmExprParserHelper.h b/Source/cmExprParserHelper.h
new file mode 100644
index 0000000000..5fd2c3d2f4
--- /dev/null
+++ b/Source/cmExprParserHelper.h
@@ -0,0 +1,79 @@
+/*=========================================================================
+
+  Program:   CMake - Cross-Platform Makefile Generator
+  Module:    $RCSfile$
+  Language:  C++
+  Date:      $Date$
+  Version:   $Revision$
+
+  Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
+  See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
+
+     This software is distributed WITHOUT ANY WARRANTY; without even 
+     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
+     PURPOSE.  See the above copyright notices for more information.
+
+=========================================================================*/
+#ifndef cmExprParserHelper_h 
+#define cmExprParserHelper_h
+
+#include "cmStandardIncludes.h"
+
+#define YYSTYPE cmExprParserHelper::ParserType
+#define YYSTYPE_IS_DECLARED
+#define YY_EXTRA_TYPE cmExprParserHelper*
+#define YY_DECL int cmExpr_yylex(YYSTYPE* yylvalp, yyscan_t yyscanner)
+
+/** \class cmExprParserHelper
+ * \brief Helper class for parsing java source files
+ *
+ * Finds dependencies for java file and list of outputs
+ */
+
+class cmMakefile;
+
+class cmExprParserHelper
+{
+public:
+  typedef struct {
+    int Number;
+  } ParserType;
+
+  cmExprParserHelper();
+  ~cmExprParserHelper();
+
+  int ParseString(const char* str, int verb);
+
+  int LexInput(char* buf, int maxlen);
+  void Error(const char* str);
+
+  void SetResult(int value);
+
+  int GetResult() { return m_Result; }
+
+  void SetLineFile(long line, const char* file);
+
+  const char* GetError() { return m_Error.c_str(); }
+
+private:
+  cmStdString::size_type InputBufferPos;
+  cmStdString InputBuffer;
+  std::vector<char> OutputBuffer;
+  int CurrentLine;
+  int UnionsAvailable;
+  int Verbose;
+
+  void Print(const char* place, const char* str);
+
+  void CleanupParser();
+
+  int m_Result;
+  const char* m_FileName;
+  long m_FileLine;
+  std::string m_Error;
+};
+
+#endif
+
+
+
diff --git a/Source/cmExprParserTokens.h b/Source/cmExprParserTokens.h
new file mode 100644
index 0000000000..f76e537bfb
--- /dev/null
+++ b/Source/cmExprParserTokens.h
@@ -0,0 +1,76 @@
+/* A Bison parser, made by GNU Bison 1.875d.  */
+
+/* Skeleton parser for Yacc-like parsing with Bison,
+   Copyright (C) 1984, 1989, 1990, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+/* As a special exception, when this file is copied by Bison into a
+   Bison output file, you may use that output file without restriction.
+   This special exception was added by the Free Software Foundation
+   in version 1.24 of Bison.  */
+
+/* Tokens.  */
+#ifndef YYTOKENTYPE
+# define YYTOKENTYPE
+   /* Put the tokens into the symbol table, so that GDB and other debuggers
+      know about them.  */
+   enum yytokentype {
+     exp_PLUS = 258,
+     exp_MINUS = 259,
+     exp_TIMES = 260,
+     exp_DIVIDE = 261,
+     exp_MOD = 262,
+     exp_SHIFTLEFT = 263,
+     exp_SHIFTRIGHT = 264,
+     exp_OPENPARENT = 265,
+     exp_CLOSEPARENT = 266,
+     exp_OR = 267,
+     exp_AND = 268,
+     exp_XOR = 269,
+     exp_NOT = 270,
+     exp_NUMBER = 271
+   };
+#endif
+#define exp_PLUS 258
+#define exp_MINUS 259
+#define exp_TIMES 260
+#define exp_DIVIDE 261
+#define exp_MOD 262
+#define exp_SHIFTLEFT 263
+#define exp_SHIFTRIGHT 264
+#define exp_OPENPARENT 265
+#define exp_CLOSEPARENT 266
+#define exp_OR 267
+#define exp_AND 268
+#define exp_XOR 269
+#define exp_NOT 270
+#define exp_NUMBER 271
+
+
+
+
+#if ! defined (YYSTYPE) && ! defined (YYSTYPE_IS_DECLARED)
+typedef int YYSTYPE;
+# define yystype YYSTYPE /* obsolescent; will be withdrawn */
+# define YYSTYPE_IS_DECLARED 1
+# define YYSTYPE_IS_TRIVIAL 1
+#endif
+
+
+
+
+
diff --git a/Source/cmMathCommand.cxx b/Source/cmMathCommand.cxx
new file mode 100644
index 0000000000..bbb3edc43f
--- /dev/null
+++ b/Source/cmMathCommand.cxx
@@ -0,0 +1,65 @@
+/*=========================================================================
+
+  Program:   CMake - Cross-Platform Makefile Generator
+  Module:    $RCSfile$
+  Language:  C++
+  Date:      $Date$
+  Version:   $Revision$
+
+  Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
+  See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
+
+     This software is distributed WITHOUT ANY WARRANTY; without even 
+     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
+     PURPOSE.  See the above copyright notices for more information.
+
+=========================================================================*/
+#include "cmMathCommand.h"
+
+#include "cmExprParserHelper.h"
+
+//----------------------------------------------------------------------------
+bool cmMathCommand::InitialPass(std::vector<std::string> const& args)
+{
+  if ( args.size() < 1 )
+    {
+    this->SetError("must be called with at least one argument.");
+    return false;
+    }
+  const std::string &subCommand = args[0];
+  if(subCommand == "EXPR")
+    {
+    return this->HandleExprCommand(args);
+    }
+  std::string e = "does not recognize sub-command "+subCommand;
+  this->SetError(e.c_str());
+  return false;
+}
+
+//----------------------------------------------------------------------------
+bool cmMathCommand::HandleExprCommand(std::vector<std::string> const& args)
+{
+  if ( args.size() != 3 )
+    {
+    this->SetError("EXPR called with incorrect arguments.");
+    return false;
+    }
+
+  const std::string& outputVariable = args[1];
+  const std::string& expression = args[2];
+  
+  cmExprParserHelper helper;
+  if ( !helper.ParseString(expression.c_str(), 0) )
+    {
+    std::string e = "cannot parse the expression: \""+expression+"\": ";
+    e += helper.GetError();
+    this->SetError(e.c_str());
+    return false;
+    }
+
+  char buffer[1024];
+  sprintf(buffer, "%d", helper.GetResult());
+
+  m_Makefile->AddDefinition(outputVariable.c_str(), buffer);
+  return true;
+}
diff --git a/Source/cmMathCommand.h b/Source/cmMathCommand.h
new file mode 100644
index 0000000000..ddebac54aa
--- /dev/null
+++ b/Source/cmMathCommand.h
@@ -0,0 +1,80 @@
+/*=========================================================================
+
+  Program:   CMake - Cross-Platform Makefile Generator
+  Module:    $RCSfile$
+  Language:  C++
+  Date:      $Date$
+  Version:   $Revision$
+
+  Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
+  See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
+
+     This software is distributed WITHOUT ANY WARRANTY; without even 
+     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
+     PURPOSE.  See the above copyright notices for more information.
+
+=========================================================================*/
+#ifndef cmMathCommand_h
+#define cmMathCommand_h
+
+#include "cmCommand.h"
+
+/** \class cmMathCommand
+ * \brief Common string operations
+ *
+ */
+class cmMathCommand : public cmCommand
+{
+public:
+  /**
+   * This is a virtual constructor for the command.
+   */
+  virtual cmCommand* Clone() 
+    {
+    return new cmMathCommand;
+    }
+
+  /**
+   * This is called when the command is first encountered in
+   * the CMakeLists.txt file.
+   */
+  virtual bool InitialPass(std::vector<std::string> const& args);
+
+  /**
+   * This determines if the command is invoked when in script mode.
+   */
+  virtual bool IsScriptable() { return true; }
+
+  /**
+   * The name of the command as specified in CMakeList.txt.
+   */
+  virtual const char* GetName() { return "MATH";}
+
+  /**
+   * Succinct documentation.
+   */
+  virtual const char* GetTerseDocumentation() 
+    {
+    return "Mathematical expressions.";
+    }
+  
+  /**
+   * More documentation.
+   */
+  virtual const char* GetFullDocumentation()
+    {
+    return
+      "  MATH(EXPR <output variable> <math expression>)\n"
+      "EXPR evaluates mathematical expression and return result in the "
+      "output variable. Example mathematical expression is '5 * ( 10 + 13 )'.";
+    }
+  
+  cmTypeMacro(cmMathCommand, cmCommand);
+protected:
+ 
+  bool HandleExprCommand(std::vector<std::string> const& args);
+};
+
+
+#endif
+
diff --git a/Source/cmStringCommand.cxx b/Source/cmStringCommand.cxx
index d7b6a91775..d0063c83b3 100644
--- a/Source/cmStringCommand.cxx
+++ b/Source/cmStringCommand.cxx
@@ -29,7 +29,7 @@ bool cmStringCommand::InitialPass(std::vector<std::string> const& args)
     return false;
     }
   
-  std::string subCommand = args[0];
+  const std::string &subCommand = args[0];
   if(subCommand == "REGEX")
     {
     return this->HandleRegexCommand(args);