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regex: Add JavaScript compat mode

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Since PCRE 7.7, there's a flag that changes the behaviour to be more
JavaScript compatible. Since it's no effort to expose it, just do so.
This commit is contained in:
Christian Persch
2012-06-07 20:12:11 +02:00
parent e5550a24db
commit 0a2967030a
3 changed files with 40 additions and 21 deletions
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52
glib/gregex.c
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@@ -88,6 +88,18 @@
* unescaped "#" outside a character class is encountered. This indicates
* a comment that lasts until after the next newline.
*
* When setting the %G_REGEX_JAVASCRIPT_COMPAT flag, pattern syntax and pattern
* matching is changed to be compatible with the way that regular expressions
* work in JavaScript. More precisely, a lonely ']' character in the pattern
* is a syntax error; the '\x' escape only allows 0 to 2 hexadecimal digits, and
* you must use the '\u' escape sequence with 4 hex digits to specify a unicode
* codepoint instead of '\x' or 'x{....}'. If '\x' or '\u' are not followed by
* the specified number of hex digits, they match 'x' and 'u' literally; also
* '\U' always matches 'U' instead of being an error in the pattern. Finally,
* pattern matching is modified so that back references to an unset subpattern
* group produces a match with the empty string instead of an error. See
* <ulink>man:pcreapi(3)<ulink> for more information.
*
* Creating and manipulating the same #GRegex structure from different
* threads is not a problem as #GRegex does not modify its internal
* state between creation and destruction, on the other hand #GMatchInfo
@@ -114,7 +126,8 @@
G_REGEX_NEWLINE_LF | \
G_REGEX_NEWLINE_CRLF | \
G_REGEX_NEWLINE_ANYCRLF | \
G_REGEX_BSR_ANYCRLF)
G_REGEX_BSR_ANYCRLF | \
G_REGEX_JAVASCRIPT_COMPAT)
/* Mask of all GRegexCompileFlags values that are (not) passed trough to PCRE */
#define G_REGEX_COMPILE_PCRE_MASK (G_REGEX_COMPILE_MASK & ~G_REGEX_COMPILE_NONPCRE_MASK)
@@ -136,20 +149,21 @@
G_REGEX_MATCH_BSR_ANY)
/* we rely on these flags having the same values */
G_STATIC_ASSERT (G_REGEX_CASELESS == PCRE_CASELESS);
G_STATIC_ASSERT (G_REGEX_MULTILINE == PCRE_MULTILINE);
G_STATIC_ASSERT (G_REGEX_DOTALL == PCRE_DOTALL);
G_STATIC_ASSERT (G_REGEX_EXTENDED == PCRE_EXTENDED);
G_STATIC_ASSERT (G_REGEX_ANCHORED == PCRE_ANCHORED);
G_STATIC_ASSERT (G_REGEX_DOLLAR_ENDONLY == PCRE_DOLLAR_ENDONLY);
G_STATIC_ASSERT (G_REGEX_UNGREEDY == PCRE_UNGREEDY);
G_STATIC_ASSERT (G_REGEX_NO_AUTO_CAPTURE == PCRE_NO_AUTO_CAPTURE);
G_STATIC_ASSERT (G_REGEX_DUPNAMES == PCRE_DUPNAMES);
G_STATIC_ASSERT (G_REGEX_NEWLINE_CR == PCRE_NEWLINE_CR);
G_STATIC_ASSERT (G_REGEX_NEWLINE_LF == PCRE_NEWLINE_LF);
G_STATIC_ASSERT (G_REGEX_NEWLINE_CRLF == PCRE_NEWLINE_CRLF);
G_STATIC_ASSERT (G_REGEX_NEWLINE_ANYCRLF == PCRE_NEWLINE_ANYCRLF);
G_STATIC_ASSERT (G_REGEX_BSR_ANYCRLF == PCRE_BSR_ANYCRLF);
G_STATIC_ASSERT (G_REGEX_CASELESS == PCRE_CASELESS);
G_STATIC_ASSERT (G_REGEX_MULTILINE == PCRE_MULTILINE);
G_STATIC_ASSERT (G_REGEX_DOTALL == PCRE_DOTALL);
G_STATIC_ASSERT (G_REGEX_EXTENDED == PCRE_EXTENDED);
G_STATIC_ASSERT (G_REGEX_ANCHORED == PCRE_ANCHORED);
G_STATIC_ASSERT (G_REGEX_DOLLAR_ENDONLY == PCRE_DOLLAR_ENDONLY);
G_STATIC_ASSERT (G_REGEX_UNGREEDY == PCRE_UNGREEDY);
G_STATIC_ASSERT (G_REGEX_NO_AUTO_CAPTURE == PCRE_NO_AUTO_CAPTURE);
G_STATIC_ASSERT (G_REGEX_DUPNAMES == PCRE_DUPNAMES);
G_STATIC_ASSERT (G_REGEX_NEWLINE_CR == PCRE_NEWLINE_CR);
G_STATIC_ASSERT (G_REGEX_NEWLINE_LF == PCRE_NEWLINE_LF);
G_STATIC_ASSERT (G_REGEX_NEWLINE_CRLF == PCRE_NEWLINE_CRLF);
G_STATIC_ASSERT (G_REGEX_NEWLINE_ANYCRLF == PCRE_NEWLINE_ANYCRLF);
G_STATIC_ASSERT (G_REGEX_BSR_ANYCRLF == PCRE_BSR_ANYCRLF);
G_STATIC_ASSERT (G_REGEX_JAVASCRIPT_COMPAT == PCRE_JAVASCRIPT_COMPAT);
G_STATIC_ASSERT (G_REGEX_MATCH_ANCHORED == PCRE_ANCHORED);
G_STATIC_ASSERT (G_REGEX_MATCH_NOTBOL == PCRE_NOTBOL);
@@ -472,6 +486,9 @@ translate_compile_error (gint *errcode, const gchar **errmsg)
case G_REGEX_ERROR_MISSING_DIGIT:
*errmsg = _("digit expected after (?+");
break;
case G_REGEX_ERROR_INVALID_DATA_CHARACTER:
*errmsg = _("] is an invalid data character in JavaScript compatibility mode");
break;
case G_REGEX_ERROR_EXTRA_SUBPATTERN_NAME:
*errmsg = _("different names for subpatterns of the same number are not allowed");
break;
@@ -513,11 +530,6 @@ translate_compile_error (gint *errcode, const gchar **errmsg)
case 174: /* invalid UTF-16 string */
/* These errors should not happen as we are using an UTF-8 and UCP-enabled PCRE
* and we do not check if strings are valid */
case 164: /* ] is an invalid data character in JavaScript compatibility mode */
/* This should not happen as we don't use PCRE_JAVASCRIPT_COMPAT */
g_warning ("%s", *errmsg);
*errcode = G_REGEX_ERROR_COMPILE;
break;
case 170: /* internal error: unknown opcode in find_fixedlength() */
*errcode = G_REGEX_ERROR_INTERNAL;
break;