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postgresql/contrib/xml2/xslt_proc.c

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/*
* $PostgreSQL: pgsql/contrib/xml2/xslt_proc.c,v 1.13 2008/05/17 01:28:22 adunstan Exp $
*
* XSLT processing functions (requiring libxslt) */
/* John Gray, for Torchbox 2003-04-01 */
#include "postgres.h"
#include "fmgr.h"
#include "executor/spi.h"
#include "funcapi.h"
#include "miscadmin.h"
/* libxml includes */
#include <libxml/xpath.h>
#include <libxml/tree.h>
#include <libxml/xmlmemory.h>
/* libxslt includes */
#include <libxslt/xslt.h>
#include <libxslt/xsltInternals.h>
#include <libxslt/transform.h>
#include <libxslt/xsltutils.h>
/* declarations to come from xpath.c */
extern void elog_error(int level, char *explain, int force);
extern void pgxml_parser_init();
extern xmlChar *pgxml_texttoxmlchar(text *textstring);
/* local defs */
static void parse_params(const char **params, text *paramstr);
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Datum xslt_process(PG_FUNCTION_ARGS);
#define MAXPARAMS 20
PG_FUNCTION_INFO_V1(xslt_process);
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Datum
xslt_process(PG_FUNCTION_ARGS)
{
text *doct = PG_GETARG_TEXT_P(0);
text *ssheet = PG_GETARG_TEXT_P(1);
text *paramstr;
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const char *params[MAXPARAMS + 1]; /* +1 for the terminator */
xsltStylesheetPtr stylesheet = NULL;
xmlDocPtr doctree;
xmlDocPtr restree;
xmlDocPtr ssdoc = NULL;
xmlChar *resstr;
int resstat;
int reslen;
if (fcinfo->nargs == 3)
{
paramstr = PG_GETARG_TEXT_P(2);
parse_params(params, paramstr);
}
else
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/* No parameters */
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params[0] = NULL;
/* Setup parser */
pgxml_parser_init();
/* Check to see if document is a file or a literal */
if (VARDATA(doct)[0] == '<')
doctree = xmlParseMemory((char *) VARDATA(doct), VARSIZE(doct) - VARHDRSZ);
else
doctree = xmlParseFile(text_to_cstring(doct));
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if (doctree == NULL)
{
xmlCleanupParser();
elog_error(ERROR, "error parsing XML document", 0);
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PG_RETURN_NULL();
}
/* Same for stylesheet */
if (VARDATA(ssheet)[0] == '<')
{
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ssdoc = xmlParseMemory((char *) VARDATA(ssheet),
VARSIZE(ssheet) - VARHDRSZ);
if (ssdoc == NULL)
{
xmlFreeDoc(doctree);
xmlCleanupParser();
elog_error(ERROR, "error parsing stylesheet as XML document", 0);
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PG_RETURN_NULL();
}
stylesheet = xsltParseStylesheetDoc(ssdoc);
}
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else
stylesheet = xsltParseStylesheetFile((xmlChar *) text_to_cstring(ssheet));
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if (stylesheet == NULL)
{
xmlFreeDoc(doctree);
xsltCleanupGlobals();
xmlCleanupParser();
elog_error(ERROR, "failed to parse stylesheet", 0);
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PG_RETURN_NULL();
}
restree = xsltApplyStylesheet(stylesheet, doctree, params);
resstat = xsltSaveResultToString(&resstr, &reslen, restree, stylesheet);
xsltFreeStylesheet(stylesheet);
xmlFreeDoc(restree);
xmlFreeDoc(doctree);
xsltCleanupGlobals();
xmlCleanupParser();
if (resstat < 0)
PG_RETURN_NULL();
PG_RETURN_TEXT_P(cstring_to_text_with_len((char *) resstr, reslen));
}
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void
parse_params(const char **params, text *paramstr)
{
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char *pos;
char *pstr;
int i;
char *nvsep = "=";
char *itsep = ",";
pstr = text_to_cstring(paramstr);
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pos = pstr;
for (i = 0; i < MAXPARAMS; i++)
{
params[i] = pos;
pos = strstr(pos, nvsep);
if (pos != NULL)
{
*pos = '\0';
pos++;
}
else
{
params[i] = NULL;
break;
}
/* Value */
i++;
params[i] = pos;
pos = strstr(pos, itsep);
if (pos != NULL)
{
*pos = '\0';
pos++;
}
else
break;
}
if (i < MAXPARAMS)
params[i + 1] = NULL;
}