summaryrefslogtreecommitdiff
path: root/src/libs/libgroff/nametoindex.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/libs/libgroff/nametoindex.cpp')
-rw-r--r--src/libs/libgroff/nametoindex.cpp117
1 files changed, 117 insertions, 0 deletions
diff --git a/src/libs/libgroff/nametoindex.cpp b/src/libs/libgroff/nametoindex.cpp
new file mode 100644
index 00000000..def26b32
--- /dev/null
+++ b/src/libs/libgroff/nametoindex.cpp
@@ -0,0 +1,117 @@
+// -*- C++ -*-
+/* Copyright (C) 1989, 1990, 1991, 1992, 2000, 2001, 2002, 2003
+ Free Software Foundation, Inc.
+ Written by James Clark (jjc@jclark.com)
+
+This file is part of groff.
+
+groff 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.
+
+groff 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 groff; see the file COPYING. If not, write to the Free Software
+Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+#include "lib.h"
+
+#include <ctype.h>
+#include <assert.h>
+#include <stdlib.h>
+#include "errarg.h"
+#include "error.h"
+#include "font.h"
+#include "ptable.h"
+
+declare_ptable(int)
+implement_ptable(int)
+
+class character_indexer {
+public:
+ character_indexer();
+ ~character_indexer();
+ int ascii_char_index(unsigned char);
+ int named_char_index(const char *);
+ int numbered_char_index(int);
+private:
+ enum { NSMALL = 256 };
+ int next_index;
+ int ascii_index[256];
+ int small_number_index[NSMALL];
+ PTABLE(int) table;
+};
+
+character_indexer::character_indexer()
+: next_index(0)
+{
+ int i;
+ for (i = 0; i < 256; i++)
+ ascii_index[i] = -1;
+ for (i = 0; i < NSMALL; i++)
+ small_number_index[i] = -1;
+}
+
+character_indexer::~character_indexer()
+{
+}
+
+int character_indexer::ascii_char_index(unsigned char c)
+{
+ if (ascii_index[c] < 0)
+ ascii_index[c] = next_index++;
+ return ascii_index[c];
+}
+
+int character_indexer::numbered_char_index(int n)
+{
+ if (n >= 0 && n < NSMALL) {
+ if (small_number_index[n] < 0)
+ small_number_index[n] = next_index++;
+ return small_number_index[n];
+ }
+ // Not the most efficient possible implementation.
+ char buf[INT_DIGITS + 3];
+ buf[0] = ' ';
+ strcpy(buf + 1, i_to_a(n));
+ return named_char_index(buf);
+}
+
+int character_indexer::named_char_index(const char *s)
+{
+ int *np = table.lookup(s);
+ if (!np) {
+ np = new int[1];
+ *np = next_index++;
+ table.define(s, np);
+ }
+ return *np;
+}
+
+static character_indexer indexer;
+
+int font::number_to_index(int n)
+{
+ return indexer.numbered_char_index(n);
+}
+
+int font::name_to_index(const char *s)
+{
+ assert(s != 0 && s[0] != '\0' && s[0] != ' ');
+ if (s[1] == '\0')
+ return indexer.ascii_char_index(s[0]);
+ /* char128 and \200 are synonyms */
+ if (s[0] == 'c' && s[1] == 'h' && s[2] == 'a' && s[3] == 'r') {
+ char *res;
+ long n = strtol(s + 4, &res, 10);
+ if (res != s + 4 && *res == '\0' && n >= 0 && n < 256)
+ return indexer.ascii_char_index((unsigned char)n);
+ }
+ return indexer.named_char_index(s);
+}
+