1 files changed, 61 insertions, 0 deletions
diff --git a/tools/build/src/engine/scan.h b/tools/build/src/engine/scan.h
new file mode 100644
index 000000000..745477fc1
--- /dev/null
+++ b/tools/build/src/engine/scan.h
@@ -0,0 +1,61 @@
+/*
+ * Copyright 1993, 1995 Christopher Seiwald.
+ *
+ * This file is part of Jam - see jam.c for Copyright information.
+ */
+
+/*
+ * scan.h - the jam yacc scanner
+ *
+ * External functions:
+ *  yyerror( char *s ) - print a parsing error message.
+ *  yyfparse( char *s ) - scan include file s.
+ *  yylex() - parse the next token, returning its type.
+ *  yymode() - adjust lexicon of scanner.
+ *  yyparse() - declaration for yacc parser.
+ *  yyanyerrors() - indicate if any parsing errors occured.
+ *
+ * The yymode() function is for the parser to adjust the lexicon of the scanner.
+ * Aside from normal keyword scanning, there is a mode to handle action strings
+ * (look only for the closing }) and a mode to ignore most keywords when looking
+ * for a punctuation keyword. This allows non-punctuation keywords to be used in
+ * lists without quoting.
+ */
+
+#include "lists.h"
+#include "object.h"
+#include "parse.h"
+
+
+/*
+ * YYSTYPE - value of a lexical token
+ */
+
+#define YYSTYPE YYSYMBOL
+
+typedef struct _YYSTYPE
+{
+    int          type;
+    OBJECT     * string;
+    PARSE      * parse;
+    LIST       * list;
+    int          number;
+    OBJECT     * file;
+    int          line;
+    char const * keyword;
+} YYSTYPE;
+
+extern YYSTYPE yylval;
+
+void yymode( int n );
+void yyerror( char const * s );
+int yyanyerrors();
+void yyfparse( OBJECT * s );
+int yyline();
+int yylex();
+int yyparse();
+void yyinput_last_read_token( OBJECT * * name, int * line );
+
+#define SCAN_NORMAL  0  /* normal parsing */
+#define SCAN_STRING  1  /* look only for matching } */
+#define SCAN_PUNCT   2  /* only punctuation keywords */