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/*
* Copyright (C) 2002 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <config.h>
#include <sys/types.h>
#include <string.h>
#include <glib-object.h>
#include "debug.h"
#include "caps.h"
#include "matcher.h"
#include "table.h"
struct _vte_matcher {
_vte_matcher_match_func match; /* shortcut to the most common op */
struct _vte_matcher_impl *impl;
GValueArray *free_params;
};
static GMutex _vte_matcher_mutex;
static struct _vte_matcher *_vte_matcher_singleton = NULL;
static int _vte_matcher_ref_count = 0;
static struct _vte_matcher_impl dummy_vte_matcher_table = {
&_vte_matcher_table
};
/* Add a string to the matcher. */
static void
_vte_matcher_add(const struct _vte_matcher *matcher,
const char *pattern, gssize length,
const char *result)
{
matcher->impl->klass->add(matcher->impl, pattern, length, result);
}
/* Loads all sequences into matcher */
static void
_vte_matcher_init(struct _vte_matcher *matcher)
{
const char *code, *value;
char *c1;
int i, k, n, variants;
_vte_debug_print(VTE_DEBUG_LIFECYCLE, "_vte_matcher_init()\n");
code = _vte_xterm_capability_strings;
do {
value = strchr(code, '\0') + 1;
/* Escape sequences from \e@ to \e_ have a C1 counterpart
* with the eighth bit set instead of a preceding '\x1b'.
* This is encoded in the current encoding, e.g. in UTF-8
* the C1 CSI (U+009B) becomes \xC2\x9B.
*
* When matching, the bytestream is already decoded to
* Unicode codepoints. In the "code" string, each byte
* is interpreted as a Unicode codepoint (in other words,
* Latin-1 is assumed). So '\x80' .. '\x9F' bytes
* (e.g. the byte '\x9B' for CSI) are the right choice here.
*
* For each sequence containing N occurrences of \e@ to \e_,
* we create 2^N variants, by replacing every subset of them
* with their C1 counterpart.
*/
variants = 1;
for (i = 0; code[i] != '\0'; i++) {
if (code[i] == '\x1B' && code[i + 1] >= '@' && code[i + 1] <= '_') {
variants <<= 1;
}
}
for (n = 0; n < variants; n++) {
c1 = g_strdup(code);
k = 0;
for (i = 0; c1[i] != '\0'; i++) {
if (c1[i] == '\x1B' && c1[i + 1] >= '@' && c1[i + 1] <= '_') {
if (n & (1 << k)) {
memmove(c1 + i, c1 + i + 1, strlen(c1 + i + 1) + 1);
c1[i] += 0x40;
}
k++;
}
}
_vte_matcher_add(matcher, c1, strlen(c1), value);
g_free(c1);
}
code = strchr(value, '\0') + 1;
} while (*code);
_VTE_DEBUG_IF(VTE_DEBUG_MATCHER) {
g_printerr("Matcher contents:\n");
_vte_matcher_print(matcher);
g_printerr("\n");
}
}
/* Allocates new matcher structure. */
static struct _vte_matcher *
_vte_matcher_create(void)
{
struct _vte_matcher *ret = NULL;
_vte_debug_print(VTE_DEBUG_LIFECYCLE, "_vte_matcher_create()\n");
ret = g_slice_new(struct _vte_matcher);
ret->impl = &dummy_vte_matcher_table;
ret->match = NULL;
ret->free_params = NULL;
return ret;
}
/* Noone uses this matcher, free it. */
static void
_vte_matcher_destroy(struct _vte_matcher *matcher)
{
_vte_debug_print(VTE_DEBUG_LIFECYCLE, "_vte_matcher_destroy()\n");
if (matcher->free_params != NULL) {
g_value_array_free (matcher->free_params);
}
if (matcher->match != NULL) /* do not call destroy on dummy values */
matcher->impl->klass->destroy(matcher->impl);
g_slice_free(struct _vte_matcher, matcher);
}
/* Create and init matcher. */
struct _vte_matcher *
_vte_matcher_new(void)
{
struct _vte_matcher *ret = NULL;
g_mutex_lock(&_vte_matcher_mutex);
if (_vte_matcher_ref_count++ == 0) {
g_assert(_vte_matcher_singleton == NULL);
ret = _vte_matcher_create();
if (ret->match == NULL) {
ret->impl = ret->impl->klass->create();
ret->match = ret->impl->klass->match;
_vte_matcher_init(ret);
}
_vte_matcher_singleton = ret;
}
g_mutex_unlock(&_vte_matcher_mutex);
return _vte_matcher_singleton;
}
/* Free a matcher. */
void
_vte_matcher_free(struct _vte_matcher *matcher)
{
g_assert(_vte_matcher_singleton != NULL);
g_mutex_lock(&_vte_matcher_mutex);
if (--_vte_matcher_ref_count == 0) {
_vte_matcher_destroy(matcher);
_vte_matcher_singleton = NULL;
}
g_mutex_unlock(&_vte_matcher_mutex);
}
/* Check if a string matches a sequence the matcher knows about. */
const char *
_vte_matcher_match(struct _vte_matcher *matcher,
const gunichar *pattern, gssize length,
const char **res, const gunichar **consumed,
GValueArray **array)
{
if (G_UNLIKELY (array != NULL && matcher->free_params != NULL)) {
*array = matcher->free_params;
matcher->free_params = NULL;
}
return matcher->match(matcher->impl, pattern, length,
res, consumed, array);
}
/* Dump out the contents of a matcher, mainly for debugging. */
void
_vte_matcher_print(struct _vte_matcher *matcher)
{
matcher->impl->klass->print(matcher->impl);
}
/* Free a parameter array. Most of the GValue elements can clean up after
* themselves, but we're using gpointers to hold unicode character strings, and
* we need to free those ourselves. */
void
_vte_matcher_free_params_array(struct _vte_matcher *matcher,
GValueArray *params)
{
guint i;
for (i = 0; i < params->n_values; i++) {
GValue *value = ¶ms->values[i];
if (G_UNLIKELY (g_type_is_a (value->g_type, G_TYPE_POINTER))) {
g_free (g_value_get_pointer (value));
}
}
if (G_UNLIKELY (matcher == NULL || matcher->free_params != NULL)) {
g_value_array_free (params);
} else {
matcher->free_params = params;
params->n_values = 0;
}
}
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