64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
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/*
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* vim:ts=4:sw=4:expandtab
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*
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* i3 - an improved dynamic tiling window manager
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* © 2009-2011 Michael Stapelberg and contributors (see also: LICENSE)
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*
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*
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*/
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#include "all.h"
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/*
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* Creates a new 'regex' struct containing the given pattern and a PCRE
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* compiled regular expression. Also, calls pcre_study because this regex will
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* most likely be used often (like for every new window and on every relevant
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* property change of existing windows).
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*
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* Returns NULL if the pattern could not be compiled into a regular expression
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* (and ELOGs an appropriate error message).
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*
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*/
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struct regex *regex_new(const char *pattern) {
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const char *error;
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int offset;
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struct regex *re = scalloc(sizeof(struct regex));
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re->pattern = sstrdup(pattern);
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if (!(re->regex = pcre_compile(pattern, 0, &error, &offset, NULL))) {
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ELOG("PCRE regular expression compilation failed at %d: %s",
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offset, error);
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return NULL;
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}
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re->extra = pcre_study(re->regex, 0, &error);
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return re;
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}
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/*
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* Checks if the given regular expression matches the given input and returns
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* true if it does. In either case, it logs the outcome using LOG(), so it will
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* be visible without any debug loglevel.
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*
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*/
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bool regex_matches(struct regex *regex, const char *input) {
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int rc;
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/* TODO: is strlen(input) correct for UTF-8 matching? */
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/* TODO: enable UTF-8 */
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if ((rc = pcre_exec(regex->regex, regex->extra, input, strlen(input), 0, 0, NULL, 0)) == 0) {
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LOG("Regular expression \"%s\" matches \"%s\"\n",
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regex->pattern, input);
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return true;
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}
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if (rc == PCRE_ERROR_NOMATCH) {
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LOG("Regular expression \"%s\" does not match \"%s\"\n",
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regex->pattern, input);
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return false;
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}
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/* TODO: handle the other error codes */
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LOG("PCRE error\n");
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return false;
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}
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