loudmouth/lm-parser.c
author Mikael Hallendal <micke@imendio.com>
Wed, 08 Oct 2008 13:11:02 +0200
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permissions -rw-r--r--
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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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 * Copyright (C) 2003 Imendio AB
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 *
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 * This program is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public License as
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 * published by the Free Software Foundation; either version 2 of the
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 * License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this program; if not, write to the
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 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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 * Boston, MA 02111-1307, USA.
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 */
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#include <config.h>
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#include <string.h>
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#include <glib.h>
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#include "lm-debug.h"
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#include "lm-internals.h"
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#include "lm-message-node.h"
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#include "lm-parser.h"
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#define SHORT_END_TAG "/>"
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#define XML_MAX_DEPTH 5
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#define LM_PARSER(o) ((LmParser *) o)
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struct LmParser {
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    LmParserMessageFunction  function;
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    gpointer                 user_data;
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    GDestroyNotify           notify;
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    LmMessageNode           *cur_root;
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    LmMessageNode           *cur_node;
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    GMarkupParser           *m_parser;
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    GMarkupParseContext     *context;
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};
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/* Used while parsing */
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static void    parser_start_node_cb (GMarkupParseContext  *context,
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                                     const gchar          *node_name,
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                                     const gchar         **attribute_names,
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                                     const gchar         **attribute_values,
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                                     gpointer              user_data,
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                                     GError              **error);
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static void    parser_end_node_cb   (GMarkupParseContext  *context,
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                                     const gchar          *node_name,
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                                     gpointer              user_data,
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                                     GError              **error);
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static void    parser_text_cb       (GMarkupParseContext  *context,
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                                     const gchar          *text,
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                                     gsize                 text_len,  
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                                     gpointer              user_data,
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                                     GError              **error);
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static void    parser_error_cb      (GMarkupParseContext  *context,
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                                     GError               *error,
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                                     gpointer              user_data);
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static void
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parser_start_node_cb (GMarkupParseContext  *context,
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                      const gchar          *node_name,
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                      const gchar         **attribute_names,
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                      const gchar         **attribute_values,
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                      gpointer              user_data,
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                      GError              **error)
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{   
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    LmParser     *parser;
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    gint          i;
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    parser = LM_PARSER (user_data);;
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/*  parser->cur_depth++; */
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    if (!parser->cur_root) {
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        /* New toplevel element */
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        parser->cur_root = _lm_message_node_new (node_name);
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        parser->cur_node = parser->cur_root;
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    } else {
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        LmMessageNode *parent_node;
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        parent_node = parser->cur_node;
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        parser->cur_node = _lm_message_node_new (node_name);
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        _lm_message_node_add_child_node (parent_node,
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                                         parser->cur_node);
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    }
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    for (i = 0; attribute_names[i]; ++i) {
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        g_log (LM_LOG_DOMAIN, LM_LOG_LEVEL_PARSER, 
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               "ATTRIBUTE: %s = %s\n", 
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               attribute_names[i],
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               attribute_values[i]);
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        lm_message_node_set_attributes (parser->cur_node,
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                                        attribute_names[i],
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                                        attribute_values[i], 
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                                        NULL);
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    }
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    if (strcmp ("stream:stream", node_name) == 0) {
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        parser_end_node_cb (context,
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                            "stream:stream",
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                            user_data, 
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                            error);
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    }
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}
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static void
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parser_end_node_cb (GMarkupParseContext  *context,
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                    const gchar          *node_name,
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                    gpointer              user_data,
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                    GError              **error)
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{
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    LmParser     *parser;
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    parser = LM_PARSER (user_data);
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    g_log (LM_LOG_DOMAIN, LM_LOG_LEVEL_PARSER,
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           "Trying to close node: %s\n", node_name);
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    if (!parser->cur_node) {
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        /* FIXME: LM-1 should look at this */
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        return;
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    }
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    if (strcmp (parser->cur_node->name, node_name) != 0) {
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        if (strcmp (node_name, "stream:stream")) {
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            g_print ("Got an stream:stream end\n");
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        }
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        g_log (LM_LOG_DOMAIN, LM_LOG_LEVEL_PARSER,
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               "Trying to close node that isn't open: %s",
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               node_name);
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        return;
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    }
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    if (parser->cur_node == parser->cur_root) {
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        LmMessage *m;
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        m = _lm_message_new_from_node (parser->cur_root);
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        if (!m) {
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            g_log (LM_LOG_DOMAIN, LM_LOG_LEVEL_PARSER,
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                   "Couldn't create message: %s\n",
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                   parser->cur_root->name);
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            return;
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        }
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        g_log (LM_LOG_DOMAIN, LM_LOG_LEVEL_PARSER,
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               "Have a new message\n");
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        if (parser->function) {
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            (* parser->function) (parser, m, parser->user_data);
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        }
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        lm_message_unref (m);
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        lm_message_node_unref (parser->cur_root);
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        parser->cur_node = parser->cur_root = NULL;
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    } else {
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        LmMessageNode *tmp_node;
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        tmp_node = parser->cur_node;
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        parser->cur_node = parser->cur_node->parent;
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        lm_message_node_unref (tmp_node);
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    }
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}
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static void
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parser_text_cb (GMarkupParseContext   *context,
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                const gchar           *text,
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                gsize                  text_len,  
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                gpointer               user_data,
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                GError               **error)
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{
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    LmParser *parser;
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    g_return_if_fail (user_data != NULL);
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    parser = LM_PARSER (user_data);
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    if (parser->cur_node && strcmp (text, "") != 0) {
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        lm_message_node_set_value (parser->cur_node, text);
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    } 
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}
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static void
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parser_error_cb (GMarkupParseContext *context,
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                 GError              *error,
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                 gpointer             user_data)
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{
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    g_return_if_fail (user_data != NULL);
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    g_return_if_fail (error != NULL);
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    g_log (LM_LOG_DOMAIN, LM_LOG_LEVEL_PARSER,
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           "Parsing failed: %s\n", error->message);
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}
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LmParser *
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lm_parser_new (LmParserMessageFunction function, 
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               gpointer                user_data, 
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               GDestroyNotify          notify)
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{
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    LmParser *parser;
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    parser = g_new0 (LmParser, 1);
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    if (!parser) {
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        return NULL;
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    }
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    parser->m_parser = g_new0 (GMarkupParser, 1);
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    if (!parser->m_parser) {
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        g_free (parser);
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        return NULL;
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    }
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    parser->function  = function;
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    parser->user_data = user_data;
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    parser->notify    = notify;
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    parser->m_parser->start_element = parser_start_node_cb;
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    parser->m_parser->end_element   = parser_end_node_cb;
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    parser->m_parser->text          = parser_text_cb;
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    parser->m_parser->error         = parser_error_cb;
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    parser->context = g_markup_parse_context_new (parser->m_parser, 0,
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                                                  parser, NULL);
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    parser->cur_root = NULL;
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    parser->cur_node = NULL;
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    return parser;
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}
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gboolean
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lm_parser_parse (LmParser *parser, const gchar *string)
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{
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    g_return_val_if_fail (parser != NULL, FALSE);
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    if (!parser->context) {
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        parser->context = g_markup_parse_context_new (parser->m_parser, 0,
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                                                      parser, NULL);
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    }
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    if (g_markup_parse_context_parse (parser->context, string, 
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                                      (gssize)strlen (string), NULL)) {
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        return TRUE;
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    } else {
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        g_markup_parse_context_free (parser->context);
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        parser->context = NULL;
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        return FALSE;
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    }
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}
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void
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lm_parser_free (LmParser *parser)
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{
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    if (parser->notify) {
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        (* parser->notify) (parser->user_data);
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    }
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518
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    if (parser->context) {
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        g_markup_parse_context_free (parser->context);
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    }
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    g_free (parser->m_parser);
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    g_free (parser);
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}
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