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/**
* This example looks up a node from a document with an
* xpath expression, then reports all properties that apply
* from a given stylesheet.
*
* To compile it using gcc, type
*
* gcc `croco-config --cflags` `croco-config --libs` -o selection-example-1 selection-example-1.c
*
* @author Stefan Seefeld <seefeld@sympatico.ca>
*/
#include <libcroco.h>
#include <libxml/tree.h>
#include <libxml/xpath.h>
void usage_and_exit(char *progname)
{
fprintf(stderr, "Usage: %s <xml doc> <stylesheet> <xpath>\n", progname);
exit(-1);
}
struct workspace
{
xmlDoc *document;
xmlXPathContext *xpath;
xmlXPathObject *result;
CRStyleSheet *stylesheet;
CRCascade *cascade;
CRSelEng *selector;
};
/**
*construct workspace members in order...
* return 0 on success and -1 on error
*/
int init(struct workspace *ws, char **args)
{
short i = 0;
enum CRStatus status = CR_OK;
ws->document = 0;
ws->xpath = 0;
ws->result = 0;
ws->stylesheet = 0;
ws->cascade = 0;
ws->selector = 0;
ws->document = xmlParseFile(args[0]);
if (!ws->document)
{
fprintf(stderr, "could not parse the document %s", args[0]);
return -1;
}
ws->xpath = xmlXPathNewContext(ws->document);
if (!ws->xpath)
{
fprintf(stderr, "Error: unable to create new XPath context\n");
return -1;
}
ws->result = xmlXPathEvalExpression((xmlChar *)args[2], ws->xpath);
if (!ws->result)
{
fprintf(stderr, "Error: unable to evaluate xpath expression\n");
return -1;
}
if (ws->result->type != XPATH_NODESET || !ws->result->nodesetval)
{
fprintf(stderr, "Error: xpath does not evaluate to a node set\n");
return -1;
}
status = cr_om_parser_simply_parse_file((const guchar*)args[1] /*sheet*/,
CR_ASCII /*the encoding*/,
&ws->stylesheet);
if (status != CR_OK || !ws->stylesheet)
{
fprintf(stderr, "could not parse the stylesheet %s", args[1]);
return -1;
}
ws->cascade = cr_cascade_new(ws->stylesheet, 0, 0);
ws->selector = cr_sel_eng_new();
}
/* ...and destruct in reverse order*/
void fini(struct workspace *ws)
{
if (ws->selector)
{
cr_sel_eng_destroy(ws->selector);
ws->selector = NULL ;
}
if (ws->cascade)
{
cr_cascade_destroy(ws->cascade);
ws->cascade = NULL ;
}
if (ws->result)
{
xmlXPathFreeObject(ws->result);
ws->result = NULL ;
}
if (ws->xpath)
{
xmlXPathFreeContext(ws->xpath);
ws->xpath = NULL ;
}
if (ws->document)
{
xmlFreeDoc(ws->document);
ws->document = NULL ;
}
}
void print_property(gpointer name, gpointer decl, gpointer data)
{
CRDeclaration *declaration = (CRDeclaration *)decl;
printf("%s\n", (char *)cr_declaration_to_string(declaration, 0));
}
void print_properties(struct workspace *ws)
{
enum CRStatus status;
GHashTable *table = g_hash_table_new(g_str_hash, g_str_equal);
xmlNode *node = ws->result->nodesetval->nodeTab[0];
if (!table)
{
fprintf(stderr, "unable to allocate a hash table\n");
return;
}
status = cr_sel_eng_get_matched_properties_from_cascade(ws->selector,
ws->cascade,
node,
&table);
if (status != CR_OK)
fprintf(stderr, "Error retrieving properties\n");
else
{
printf("properties for node %s :\n", (char *)xmlGetNodePath(node));
g_hash_table_foreach(table, print_property, 0);
}
g_hash_table_destroy(table);
}
int main(int argc, char **argv)
{
struct workspace ws;
if (argc != 4) usage_and_exit(argv[0]);
if (!init(&ws, argv + 1)) fini(&ws);
if (ws.result->nodesetval->nodeNr == 0)
printf("no matching nodes found\n");
else
print_properties(&ws);
fini(&ws);
return 0;
}
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