Imported nx-X11-3.1.0-1.tar.gznx-X11/3.1.0-1

Summary: Imported nx-X11-3.1.0-1.tar.gz
Keywords:

Imported nx-X11-3.1.0-1.tar.gz
into Git repository

1 files changed, 142 insertions, 0 deletions

diff --git a/nx-X11/programs/xterm/charclass.c b/nx-X11/programs/xterm/charclass.c
new file mode 100644
index 000000000..96220607c
--- /dev/null
+++ b/nx-X11/programs/xterm/charclass.c
@@ -0,0 +1,142 @@
+/* $XTermId: charclass.c,v 1.10 2005/01/14 01:50:02 tom Exp $ */
+
+/*
+ * Compact and efficient reimplementation of the
+ * xterm character class mechanism for large character sets
+ *
+ * Markus Kuhn -- mkuhn@acm.org -- 2000-07-03
+ *
+ * Xterm allows users to select entire words with a double-click on
+ * the left mouse button. Opinions might differ on what type of
+ * characters are part of separate words, therefore xterm allows users
+ * to configure a class code for each 8-bit character. Words are
+ * maximum length sequences of neighboring characters with identical
+ * class code. Extending this mechanism to Unicode naively would
+ * create an at least 2^16 entries (128 kB) long class code table.
+ * Instead, we transform the character class table into a list
+ * of intervals, that will be accessed via a linear search.
+ * Changes made to the table by the user will be appended. A special
+ * class code -1 (default) marks characters who have their code number
+ * as the class code. We could alternatively use a sorted table of
+ * non-overlapping intervals that can be accessed via binary search,
+ * but merging in new intervals is significantly more hassle and
+ * not worth the effort here.
+ */
+/* $XFree86: xc/programs/xterm/charclass.c,v 1.5 2005/01/14 01:50:02 dickey Exp $ */
+
+#include <xterm.h>
+#include <charclass.h>
+
+#if OPT_WIDE_CHARS
+
+static struct classentry {
+    int cclass;
+    int first;
+    int last;
+} *classtab;
+
+/*
+ * Special convention for classtab[0]:
+ * - classtab[0].cclass is the allocated number of entries in classtab
+ * - classtab[0].first = 1 (first used entry in classtab)
+ * - classtab[0].last is the last used entry in classtab
+ */
+
+int
+SetCharacterClassRange(int low, int high, int value)
+{
+    if (high < low)
+	return -1;		/* nothing to do */
+
+    /* make sure we have at least one free entry left at table end */
+    if (classtab[0].last > classtab[0].cclass - 2) {
+	classtab[0].cclass += 5 + classtab[0].cclass / 4;
+	classtab = TypeRealloc(struct classentry, classtab[0].cclass, classtab);
+	if (!classtab)
+	    abort();
+    }
+
+    /* simply append new interval to end of interval array */
+    classtab[0].last++;
+    classtab[classtab[0].last].first = low;
+    classtab[classtab[0].last].last = high;
+    classtab[classtab[0].last].cclass = value;
+
+    return 0;
+}
+
+void
+init_classtab(void)
+{
+    const int size = 50;
+
+    classtab = TypeMallocN(struct classentry, size);
+    if (!classtab)
+	abort();
+    classtab[0].cclass = size;
+    classtab[0].first = 1;
+    classtab[0].last = 0;
+
+    /* old xterm default classes */
+    SetCharacterClassRange(0, 0, 32);
+    SetCharacterClassRange(1, 31, 1);
+    SetCharacterClassRange('\t', '\t', 32);
+    SetCharacterClassRange('0', '9', 48);
+    SetCharacterClassRange('A', 'Z', 48);
+    SetCharacterClassRange('_', '_', 48);
+    SetCharacterClassRange('a', 'z', 48);
+    SetCharacterClassRange(127, 159, 1);
+    SetCharacterClassRange(160, 191, -1);
+    SetCharacterClassRange(192, 255, 48);
+    SetCharacterClassRange(215, 215, 216);
+    SetCharacterClassRange(247, 247, 248);
+
+    /* added Unicode classes */
+    SetCharacterClassRange(0x0100, 0xffdf, 48);		/* mostly characters */
+    SetCharacterClassRange(0x037e, 0x037e, -1);		/* Greek question mark */
+    SetCharacterClassRange(0x0387, 0x0387, -1);		/* Greek ano teleia */
+    SetCharacterClassRange(0x055a, 0x055f, -1);		/* Armenian punctuation */
+    SetCharacterClassRange(0x0589, 0x0589, -1);		/* Armenian full stop */
+    SetCharacterClassRange(0x0700, 0x070d, -1);		/* Syriac punctuation */
+    SetCharacterClassRange(0x104a, 0x104f, -1);		/* Myanmar punctuation */
+    SetCharacterClassRange(0x10fb, 0x10fb, -1);		/* Georgian punctuation */
+    SetCharacterClassRange(0x1361, 0x1368, -1);		/* Ethiopic punctuation */
+    SetCharacterClassRange(0x166d, 0x166e, -1);		/* Canadian Syl. punctuation */
+    SetCharacterClassRange(0x17d4, 0x17dc, -1);		/* Khmer punctuation */
+    SetCharacterClassRange(0x1800, 0x180a, -1);		/* Mongolian punctuation */
+    SetCharacterClassRange(0x2000, 0x200a, 32);		/* spaces */
+    SetCharacterClassRange(0x200b, 0x27ff, -1);		/* punctuation and symbols */
+    SetCharacterClassRange(0x2070, 0x207f, 0x2070);	/* superscript */
+    SetCharacterClassRange(0x2080, 0x208f, 0x2080);	/* subscript */
+    SetCharacterClassRange(0x3000, 0x3000, 32);		/* ideographic space */
+    SetCharacterClassRange(0x3001, 0x3020, -1);		/* ideographic punctuation */
+    SetCharacterClassRange(0x3040, 0x309f, 0x3040);	/* Hiragana */
+    SetCharacterClassRange(0x30a0, 0x30ff, 0x30a0);	/* Katakana */
+    SetCharacterClassRange(0x3300, 0x9fff, 0x4e00);	/* CJK Ideographs */
+    SetCharacterClassRange(0xac00, 0xd7a3, 0xac00);	/* Hangul Syllables */
+    SetCharacterClassRange(0xf900, 0xfaff, 0x4e00);	/* CJK Ideographs */
+    SetCharacterClassRange(0xfe30, 0xfe6b, -1);		/* punctuation forms */
+    SetCharacterClassRange(0xff00, 0xff0f, -1);		/* half/fullwidth ASCII */
+    SetCharacterClassRange(0xff1a, 0xff20, -1);		/* half/fullwidth ASCII */
+    SetCharacterClassRange(0xff3b, 0xff40, -1);		/* half/fullwidth ASCII */
+    SetCharacterClassRange(0xff5b, 0xff64, -1);		/* half/fullwidth ASCII */
+
+    return;
+}
+
+int
+CharacterClass(int c)
+{
+    int i, cclass = -1;
+
+    for (i = classtab[0].first; i <= classtab[0].last; i++)
+	if (classtab[i].first <= c && classtab[i].last >= c)
+	    cclass = classtab[i].cclass;
+
+    if (cclass < 0)
+	cclass = c;
+
+    return cclass;
+}
+
+#endif /* OPT_WIDE_CHARS */