diff options
Diffstat (limited to 'xml-parser.c')
| -rw-r--r-- | xml-parser.c | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/xml-parser.c b/xml-parser.c new file mode 100644 index 0000000..88373dd --- /dev/null +++ b/xml-parser.c @@ -0,0 +1,211 @@ +/* Cataract - Static web photo gallery generator + * Copyright (C) 2008 Tomas Bzatek <tbzatek@users.sourceforge.net> + * + * 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 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. + */ +#include <stdio.h> +#include <string.h> +#include <stdlib.h> +#include <errno.h> +#include <unistd.h> + +#include <libxml/xmlmemory.h> +#include <libxml/parser.h> +#include <libxml/xpath.h> +#include <libxml/xpathInternals.h> + +#include <glib.h> + +#include "xml-parser.h" + + + +/* + * xml_parser_load: initialize and load the XML document + */ +TXMLFile * +xml_parser_load (const char *filename) +{ + TXMLFile *file; + + file = malloc (sizeof (TXMLFile)); + memset (file, 0, sizeof (TXMLFile)); + + /* Load XML document */ + file->doc = xmlParseFile (filename); + if (file->doc == NULL) { + fprintf (stderr, "Error: unable to parse file \"%s\"\n", filename); + free (file); + return NULL; + } + + /* Create xpath evaluation context */ + file->xpathCtx = xmlXPathNewContext (file->doc); + if (file->xpathCtx == NULL) { + fprintf (stderr, "Error: unable to create new XPath context\n"); + xmlFreeDoc (file->doc); + free (file); + return FALSE; + } + + return file; +} + + +/* + * xml_parser_close: close the XML document parser + */ +void +xml_parser_close (TXMLFile *file) +{ + if (file) + { + xmlXPathFreeContext (file->xpathCtx); + xmlFreeDoc (file->doc); + free (file); + file = NULL; + } +} + + +/* + * xml_file_get_node_value: retrieve value from XPath node + */ +char * +xml_file_get_node_value (TXMLFile *file, const char *x_path) +{ + xmlXPathObjectPtr xpathObj; + xmlNodePtr cur; + char *val; + + if ((! file) || (! x_path)) + return NULL; + + /* Evaluate xpath expression */ + xpathObj = xmlXPathEvalExpression ((const xmlChar *) x_path, file->xpathCtx); + if (xpathObj == NULL) { + fprintf (stderr, "Error: unable to evaluate xpath expression \"%s\"\n", x_path); + return NULL; + } + + val = NULL; + if ((xpathObj->nodesetval) && (xpathObj->nodesetval->nodeNr > 0)) { + cur = xpathObj->nodesetval->nodeTab[0]; + + #ifdef __DEBUG_ALL__ + printf("Result (%d nodes):\n", xpathObj->nodesetval->nodeNr); + printf(" XPATH matched: element node \"%s\", value = '%s'\n", cur->name, cur->content); + #endif + + if (cur->content) + val = strdup ((char *) cur->content); + } + + xmlXPathFreeObject (xpathObj); + return val; +} + + +/* + * xml_file_get_node_attribute: retrieve attribute value from XPath node + */ +char * +xml_file_get_node_attribute (TXMLFile *file, const char *x_path, const char *attr) +{ + xmlXPathObjectPtr xpathObj; + xmlNodePtr cur; + xmlChar *attrvx; + char *attrv; + + if ((! file) || (! x_path)) + return NULL; + + /* Evaluate xpath expression */ + xpathObj = xmlXPathEvalExpression ((const xmlChar *) x_path, file->xpathCtx); + if (xpathObj == NULL) { + fprintf (stderr, "Error: unable to evaluate xpath expression \"%s\"\n", x_path); + return NULL; + } + + attrv = NULL; + if ((xpathObj->nodesetval) && (xpathObj->nodesetval->nodeNr > 0)) { + cur = xpathObj->nodesetval->nodeTab[0]; + attrvx = xmlGetProp (cur, (const xmlChar *) attr); + if (attrvx) { + attrv = strdup ((char*) attrvx); + xmlFree (attrvx); + } + + #ifdef __DEBUG_ALL__ + printf("Result (%d nodes):\n", xpathObj->nodesetval->nodeNr); + printf(" XPATH matched: element node \"%s\", value = '%s', property value = '%s'\n", cur->name, cur->content, attrv); + #endif + } + + xmlXPathFreeObject (xpathObj); + return attrv; +} + +long +xml_file_get_node_attribute_long (TXMLFile *file, const char *x_path, const char *attr, const int _default) +{ + char *s; + long int i; + + s = xml_file_get_node_attribute (file, x_path, attr); + if (s == NULL) + return _default; + + i = atol (s); + free (s); + return i; +} + +/* + * xml_file_get_node_present: existency test of the XPath node + */ +gboolean +xml_file_get_node_present (TXMLFile *file, const char *x_path) +{ + return xml_file_node_get_children_count (file, x_path) > 0; +} + + +/* + * xml_file_node_get_children_count: retrieve number of children items of the specified XPath node + */ +int +xml_file_node_get_children_count (TXMLFile *file, const char *x_path) +{ + xmlXPathObjectPtr xpathObj; + int count; + + if ((! file) || (! x_path)) + return 0; + + /* Evaluate xpath expression */ + xpathObj = xmlXPathEvalExpression ((const xmlChar *) x_path, file->xpathCtx); + if (xpathObj == NULL) { + fprintf (stderr, "Error: unable to evaluate xpath expression \"%s\"\n", x_path); + return 0; + } + + count = 0; + if (xpathObj->nodesetval) + count = xpathObj->nodesetval->nodeNr; + + xmlXPathFreeObject (xpathObj); + return count; +} |