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GRegex: add g_regex_get_max_lookbehind()
It is useful for multi-segment regex matching. A unit test is included. https://bugzilla.gnome.org/show_bug.cgi?id=689794
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@ -1018,6 +1018,7 @@ g_regex_get_pattern
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g_regex_get_max_backref
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g_regex_get_capture_count
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g_regex_get_has_cr_or_lf
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g_regex_get_max_lookbehind
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g_regex_get_string_number
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g_regex_get_compile_flags
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g_regex_get_match_flags
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@ -1519,6 +1519,29 @@ g_regex_get_has_cr_or_lf (const GRegex *regex)
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return !!value;
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}
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/**
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* g_regex_get_max_lookbehind:
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* @regex: a #GRegex structure
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*
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* Gets the number of characters in the longest lookbehind assertion in the
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* pattern. This information is useful when doing multi-segment matching using
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* the partial matching facilities.
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*
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* Returns: the number of characters in the longest lookbehind assertion.
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*
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* Since: 2.38
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*/
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gint
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g_regex_get_max_lookbehind (const GRegex *regex)
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{
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gint max_lookbehind;
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pcre_fullinfo (regex->pcre_re, regex->extra,
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PCRE_INFO_MAXLOOKBEHIND, &max_lookbehind);
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return max_lookbehind;
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}
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/**
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* g_regex_get_compile_flags:
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* @regex: a #GRegex
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@ -454,6 +454,8 @@ GLIB_AVAILABLE_IN_ALL
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gint g_regex_get_capture_count (const GRegex *regex);
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GLIB_AVAILABLE_IN_ALL
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gboolean g_regex_get_has_cr_or_lf (const GRegex *regex);
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GLIB_AVAILABLE_IN_2_38
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gint g_regex_get_max_lookbehind (const GRegex *regex);
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GLIB_AVAILABLE_IN_ALL
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gint g_regex_get_string_number (const GRegex *regex,
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const gchar *name);
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@ -2084,6 +2084,24 @@ test_explicit_crlf (void)
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g_regex_unref (regex);
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}
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static void
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test_max_lookbehind (void)
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{
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GRegex *regex;
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regex = g_regex_new ("abc", 0, 0, NULL);
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g_assert_cmpint (g_regex_get_max_lookbehind (regex), ==, 0);
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g_regex_unref (regex);
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regex = g_regex_new ("\\babc", 0, 0, NULL);
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g_assert_cmpint (g_regex_get_max_lookbehind (regex), ==, 1);
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g_regex_unref (regex);
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regex = g_regex_new ("(?<=123)abc", 0, 0, NULL);
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g_assert_cmpint (g_regex_get_max_lookbehind (regex), ==, 3);
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g_regex_unref (regex);
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}
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int
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main (int argc, char *argv[])
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{
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@ -2102,6 +2120,7 @@ main (int argc, char *argv[])
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g_test_add_func ("/regex/recursion", test_recursion);
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g_test_add_func ("/regex/multiline", test_multiline);
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g_test_add_func ("/regex/explicit-crlf", test_explicit_crlf);
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g_test_add_func ("/regex/max-lookbehind", test_max_lookbehind);
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/* TEST_NEW(pattern, compile_opts, match_opts) */
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TEST_NEW("[A-Z]+", G_REGEX_CASELESS | G_REGEX_EXTENDED | G_REGEX_OPTIMIZE, G_REGEX_MATCH_NOTBOL | G_REGEX_MATCH_PARTIAL);
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