247 lines
8.1 KiB
C
247 lines
8.1 KiB
C
/*
|
|
* markup.c - markup functions
|
|
*
|
|
* Copyright © 2008 Julien Danjou <julien@danjou.info>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program 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 General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*
|
|
*/
|
|
|
|
/* asprintf */
|
|
#define _GNU_SOURCE
|
|
|
|
#include <glib.h>
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
#include "common/markup.h"
|
|
|
|
/** Callback to invoke when the opening tag of an element is seen.
|
|
* Here is just copies element elements we do not care about, and copies
|
|
* values we care.
|
|
* \param context the context of GMarkup
|
|
* \param element_name element name
|
|
* \param attribute_names array of attribute names
|
|
* \param attribute_values array of attribute values
|
|
* \param user_data pointer to user data, here a markup_parser_data_t pointer
|
|
* \param error a GError
|
|
*/
|
|
static void
|
|
markup_parse_start_element(GMarkupParseContext *context __attribute__ ((unused)),
|
|
const gchar *element_name,
|
|
const gchar **attribute_names,
|
|
const gchar **attribute_values,
|
|
gpointer user_data,
|
|
GError **error __attribute__ ((unused)))
|
|
{
|
|
markup_parser_data_t *p = (markup_parser_data_t *) user_data;
|
|
char *newtext;
|
|
int i, j;
|
|
ssize_t len;
|
|
|
|
for(i = 0; p->elements[i]; i++)
|
|
if(!a_strcmp(element_name, p->elements[i]))
|
|
{
|
|
for(j = 0; attribute_names[j]; j++);
|
|
p->attribute_names[i] = p_new(char *, j);
|
|
p->attribute_values[i] = p_new(char *, j);
|
|
|
|
for(j = 0; attribute_names[j]; j++)
|
|
{
|
|
p->attribute_names[i][j] = a_strdup(attribute_names[j]);
|
|
p->attribute_values[i][j] = a_strdup(attribute_values[j]);
|
|
}
|
|
if(p->elements_sub && p->elements_sub[i])
|
|
{
|
|
asprintf(&newtext, "%s%s", NONULL(p->text), p->elements_sub[i]);
|
|
p_delete(&p->text);
|
|
p->text = newtext;
|
|
}
|
|
return;
|
|
}
|
|
|
|
if(a_strcmp(element_name, "markup"))
|
|
{
|
|
if(!(len = asprintf(&newtext, "%s<%s ", NONULL(p->text), element_name)))
|
|
return;
|
|
len++; /* add \0 that asprintf does not return in len */
|
|
for(i = 0; attribute_names[i]; i++)
|
|
{
|
|
len += a_strlen(attribute_names[i]) + a_strlen(attribute_values[i]) + 5;
|
|
p_realloc(&newtext, len);
|
|
a_strcat(newtext, len, attribute_names[i]);
|
|
a_strcat(newtext, len, "=\"");
|
|
a_strcat(newtext, len, attribute_values[i]);
|
|
a_strcat(newtext, len, "\" ");
|
|
}
|
|
p_realloc(&newtext, ++len);
|
|
a_strcat(newtext, len, ">");
|
|
p_delete(&p->text);
|
|
p->text = newtext;
|
|
}
|
|
}
|
|
|
|
/** Callback to invoke when the closing tag of an element is seen. Note that
|
|
* this is also called for empty tags like <empty/>.
|
|
* Here is just copies element elements we do not care about.
|
|
* \param context the context of GMarkup
|
|
* \param element_name element name
|
|
* \param user_data pointer to user data, here a markup_parser_data_t pointer
|
|
* \param error a GError
|
|
*/
|
|
static void
|
|
markup_parse_end_element(GMarkupParseContext *context __attribute__ ((unused)),
|
|
const gchar *element_name,
|
|
gpointer user_data,
|
|
GError **error __attribute__ ((unused)))
|
|
{
|
|
markup_parser_data_t *p = (markup_parser_data_t *) user_data;
|
|
char *newtext;
|
|
int i;
|
|
|
|
for(i = 0; p->elements[i]; i++)
|
|
if(!a_strcmp(element_name, p->elements[i]))
|
|
return;
|
|
|
|
if(a_strcmp(element_name, "markup"))
|
|
{
|
|
asprintf(&newtext, "%s</%s>", p->text, element_name);
|
|
p_delete(&p->text);
|
|
p->text = newtext;
|
|
}
|
|
}
|
|
|
|
/** Callback to invoke when some text is seen (text is always inside an
|
|
* element). Note that the text of an element may be spread over multiple calls
|
|
* of this function. If the G_MARKUP_TREAT_CDATA_AS_TEXT flag is set, this
|
|
* function is also called for the content of CDATA marked sections.
|
|
* Here it recopies blindly the text in the text attribute of user_data.
|
|
* \param context the context of GMarkup
|
|
* \param text the text
|
|
* \param text_len the text length
|
|
* \param user_data pointer to user data, here a markup_parser_data_t pointer
|
|
* \param error a GError
|
|
*/
|
|
static void
|
|
markup_parse_text(GMarkupParseContext *context __attribute__ ((unused)),
|
|
const gchar *text,
|
|
gsize text_len,
|
|
gpointer user_data,
|
|
GError **error __attribute__ ((unused)))
|
|
{
|
|
markup_parser_data_t *p = (markup_parser_data_t *) user_data;
|
|
ssize_t rlen;
|
|
char *esc;
|
|
|
|
esc = g_markup_escape_text(text, text_len);
|
|
text_len = a_strlen(esc);
|
|
rlen = a_strlen(p->text) + 1 + text_len;
|
|
p_realloc(&p->text, rlen);
|
|
a_strncat(p->text, rlen, esc, text_len);
|
|
}
|
|
|
|
/** Create a markup_parser_data_t structure with elements list.
|
|
* \param elements an array of elements to look for, NULL terminated
|
|
* \param elements_sub an optionnal array of values to substitude to elements, NULL
|
|
* terminated, or NULL if not needed
|
|
* \param nelem number of elements in the array (without NULL)
|
|
* \return a pointer to an allocated markup_parser_data_t which must be freed
|
|
* with markup_parser_data_delete()
|
|
*/
|
|
markup_parser_data_t *
|
|
markup_parser_data_new(const char **elements, const char **elements_sub, ssize_t nelem)
|
|
{
|
|
markup_parser_data_t *p;
|
|
|
|
p = p_new(markup_parser_data_t, 1);
|
|
|
|
p->text = p_new(char, 1);
|
|
p->elements = elements;
|
|
p->elements_sub = elements_sub;
|
|
p->attribute_names = p_new(char **, nelem);
|
|
p->attribute_values = p_new(char **, nelem);
|
|
|
|
return p;
|
|
}
|
|
|
|
/** Delete a markup_parser_data_t allocated.
|
|
* \param p markup_parser_data_t pointer address
|
|
*/
|
|
void
|
|
markup_parser_data_delete(markup_parser_data_t **p)
|
|
{
|
|
int i, j;
|
|
|
|
for(i = 0; (*p)->elements[i]; i++)
|
|
if((*p)->attribute_names[i])
|
|
{
|
|
for(j = 0; (*p)->attribute_names[i][j]; j++);
|
|
{
|
|
p_delete(&(*p)->attribute_names[i][j]);
|
|
p_delete(&(*p)->attribute_values[i][j]);
|
|
}
|
|
p_delete(&(*p)->attribute_names[i]);
|
|
p_delete(&(*p)->attribute_values[i]);
|
|
}
|
|
|
|
p_delete(&(*p)->text);
|
|
p_delete(p);
|
|
}
|
|
|
|
/** Parse markup defined in data on the string str.
|
|
* \param data a markup_parser_data_t allocated by markup_parser_data_new()
|
|
* \param str a string to parse markup from
|
|
* \param slen str length
|
|
* \return true if success, false otherwise
|
|
*/
|
|
bool
|
|
markup_parse(markup_parser_data_t *data, const char *str, ssize_t slen)
|
|
{
|
|
GMarkupParseContext *mkp_ctx;
|
|
GMarkupParser parser =
|
|
{
|
|
/* start_element */
|
|
markup_parse_start_element,
|
|
/* end_element */
|
|
markup_parse_end_element,
|
|
/* text */
|
|
markup_parse_text,
|
|
/* passthrough */
|
|
NULL,
|
|
/* error */
|
|
NULL
|
|
};
|
|
GError *error = NULL;
|
|
|
|
mkp_ctx = g_markup_parse_context_new(&parser, 0, data, NULL);
|
|
|
|
if(!g_markup_parse_context_parse(mkp_ctx, "<markup>", -1, &error)
|
|
|| !g_markup_parse_context_parse(mkp_ctx, str, slen, &error)
|
|
|| !g_markup_parse_context_parse(mkp_ctx, "</markup>", -1, &error)
|
|
|| !g_markup_parse_context_end_parse(mkp_ctx, &error))
|
|
{
|
|
warn("unable to parse text \"%s\": %s\n", str, error->message);
|
|
g_error_free(error);
|
|
return false;
|
|
}
|
|
|
|
g_markup_parse_context_free(mkp_ctx);
|
|
|
|
return true;
|
|
}
|
|
|
|
// vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80
|