/* * markup.c - markup functions * * Copyright © 2008 Julien Danjou * * 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 #include #include #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 . * 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", 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); p_delete(&esc); } /** 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, "", -1, &error) || !g_markup_parse_context_parse(mkp_ctx, str, slen, &error) || !g_markup_parse_context_parse(mkp_ctx, "", -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