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//
// Pattern matching routines for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2020 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// https://www.fltk.org/COPYING.php
//
// Please see the following page on how to report bugs and issues:
//
// https://www.fltk.org/bugs.php
//
/* Adapted from Rich Salz. */
#include <FL/filename.H>
#include <ctype.h>
/**
Checks if a string \p s matches a pattern \p p.
The following syntax is used for the pattern:
- * matches any sequence of 0 or more characters.
- ? matches any single character.
- [set] matches any character in the set. Set can contain any single characters, or a-z to represent a range.
To match ] or - they must be the first characters. To match ^ or ! they must not be the first characters.
- [^set] or [!set] matches any character not in the set.
- {X|Y|Z} or {X,Y,Z} matches any one of the subexpressions literally.
- \\x quotes the character x so it has no special meaning.
- x all other characters are matched "exactly" on a \b case-insensitive basis.
Notes:
- \p s and \p p are matched on a char/byte basis, not as UCS codepoints or UTF-8 sequences.
- [set] ranges must run from low to high, i.e. [a-z] and not [z-a]
- [set] comparison is \b case-sensitive, i.e. [a-z] won't match "A".
- \\x only applies to the fl_filename_match special characters * ? [ {
- \\x needs a double \\ or the compiler will complain about non-standard escape sequences.
\b Include:
\code
#include <FL/filename.H>
\endcode
\param[in] s the string to check for a match
\param[in] p the string pattern
\return non zero if the string matches the pattern
*/
int fl_filename_match(const char *s, const char *p) {
int matched;
for (;;) {
switch(*p++) {
case '?' : // match any single character
if (!*s++) return 0;
break;
case '*' : // match 0-n of any characters
if (!*p) return 1; // do trailing * quickly
while (!fl_filename_match(s, p)) if (!*s++) return 0;
return 1;
case '[': { // match one character in set of form [abc-d] or [^a-b]
if (!*s) return 0;
int reverse = (*p=='^' || *p=='!'); if (reverse) p++;
matched = 0;
char last = 0;
while (*p) {
if (*p=='-' && last) {
if (*s <= *++p && *s >= last ) matched = 1;
last = 0;
} else {
if (*s == *p) matched = 1;
}
last = *p++;
if (*p==']') break;
}
if (matched == reverse) return 0;
s++; p++;}
break;
case '{' : // {pattern1|pattern2|pattern3}
NEXTCASE:
if (fl_filename_match(s,p)) return 1;
for (matched = 0;;) {
switch (*p++) {
case '\\': if (*p) p++; break;
case '{': matched++; break;
case '}': if (!matched--) return 0; break;
case '|': case ',': if (matched==0) goto NEXTCASE;
case 0: return 0;
}
}
case '|': // skip rest of |pattern|pattern} when called recursively
case ',':
for (matched = 0; *p && matched >= 0;) {
switch (*p++) {
case '\\': if (*p) p++; break;
case '{': matched++; break;
case '}': matched--; break;
}
}
break;
case '}':
break;
case 0: // end of pattern
return !*s;
case '\\': // quote next character
if (*p) p++;
/* FALLTHROUGH */
default:
if (tolower(*s) != tolower(*(p-1))) return 0;
s++;
break;
}
}
}
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