C++ (Cpp) g_regex_get_max_backref Beispiele

Beispiel #1

Datei: gtksourcelanguage-parser-2.c Projekt: anduchs/gtksourceview-headlining

static gchar *
expand_regex (ParserState *parser_state,
	      gchar *regex,
	      GRegexCompileFlags flags,
	      gboolean do_expand_vars,
	      gboolean insert_parentheses,
	      GError **error)
{
	gchar *tmp_regex;
	GString *expanded_regex;
	static GRegex *backref_re = NULL;

	g_assert (parser_state != NULL);
	g_return_val_if_fail (error == NULL || *error == NULL, NULL);

	if (regex == NULL)
		return NULL;

	if (backref_re == NULL)
		backref_re = g_regex_new ("(?<!\\\\)(\\\\\\\\)*\\\\[0-9]",
					  G_REGEX_OPTIMIZE | G_REGEX_NEWLINE_LF,
					  0,
					  NULL);

	if (g_regex_match (backref_re, regex, 0, NULL))
	{
		/* This may be a backreference, or it may be an octal character */
		GRegex *compiled;

		compiled = g_regex_new (regex, flags | G_REGEX_NEWLINE_LF, 0, error);

		if (compiled == NULL)
			return NULL;

		if (g_regex_get_max_backref (compiled) > 0)
		{
			g_set_error (error, PARSER_ERROR, PARSER_ERROR_MALFORMED_REGEX,
				     _("in regex '%s': backreferences are not supported"),
				     regex);
			g_regex_unref (compiled);
			return NULL;
		}

		g_regex_unref (compiled);
	}

	if (do_expand_vars)
	{
		tmp_regex = expand_regex_vars (parser_state, regex, -1, error);

		if (tmp_regex == NULL)
			return NULL;
	}
	else
	{
		tmp_regex = g_strdup (regex);
	}

	regex = tmp_regex;
	tmp_regex = expand_regex_delimiters (parser_state, regex, -1);
	g_free (regex);

	/* Set the options and add not capturing parentheses if
	 * insert_parentheses is TRUE (this is needed for included
	 * regular expressions.) */
	expanded_regex = g_string_new ("");
	if (insert_parentheses)
		g_string_append (expanded_regex, "(?:");
	g_string_append (expanded_regex, "(?");

	if (flags != 0)
	{
		if (flags & G_REGEX_CASELESS)
			g_string_append (expanded_regex, "i");
		if (flags & G_REGEX_EXTENDED)
			g_string_append (expanded_regex, "x");
		/* J is added here if it's used, but -J isn't added
		 * below */
		if (flags & G_REGEX_DUPNAMES)
			g_string_append (expanded_regex, "J");
	}

	if ((flags & (G_REGEX_CASELESS | G_REGEX_EXTENDED)) != (G_REGEX_CASELESS | G_REGEX_EXTENDED))
	{
		g_string_append (expanded_regex, "-");
		if (!(flags & G_REGEX_CASELESS))
			g_string_append (expanded_regex, "i");
		if (!(flags & G_REGEX_EXTENDED))
			g_string_append (expanded_regex, "x");
	}

	g_string_append (expanded_regex, ")");
	g_string_append (expanded_regex, tmp_regex);
	if (insert_parentheses)
	{
		/* The '\n' is needed otherwise, if the regex is "extended"
		 * and it ends with a comment, the ')' is appended inside the
		 * comment itself */
		if (flags & G_REGEX_EXTENDED)
			g_string_append (expanded_regex, "\n");

		/* FIXME: if the regex is not extended this doesn't works */
		g_string_append (expanded_regex, ")");
	}
	g_free (tmp_regex);

	return g_string_free (expanded_regex, FALSE);
}

Beispiel #2

static VALUE
rg_max_backref(VALUE self)
{
    return INT2NUM(g_regex_get_max_backref(_SELF(self)));
}