185 lines
3.5 KiB
C
185 lines
3.5 KiB
C
/* XSLT processing functions (requiring libxslt) */
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/* John Gray, for Torchbox 2003-04-01 */
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#include "postgres.h"
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#include "fmgr.h"
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#include "executor/spi.h"
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#include "funcapi.h"
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#include "miscadmin.h"
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/* libxml includes */
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#include <libxml/xpath.h>
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#include <libxml/tree.h>
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#include <libxml/xmlmemory.h>
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/* libxslt includes */
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#include <libxslt/xslt.h>
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#include <libxslt/xsltInternals.h>
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#include <libxslt/transform.h>
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#include <libxslt/xsltutils.h>
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/* declarations to come from xpath.c */
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extern void elog_error(int level, char *explain, int force);
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extern void pgxml_parser_init();
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extern xmlChar *pgxml_texttoxmlchar(text *textstring);
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#define GET_STR(textp) DatumGetCString(DirectFunctionCall1(textout, PointerGetDatum(textp)))
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/* local defs */
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static void parse_params(const char **params, text *paramstr);
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Datum xslt_process(PG_FUNCTION_ARGS);
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#define MAXPARAMS 20
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PG_FUNCTION_INFO_V1(xslt_process);
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Datum xslt_process(PG_FUNCTION_ARGS) {
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const char *params[MAXPARAMS + 1]; /* +1 for the terminator */
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xsltStylesheetPtr stylesheet = NULL;
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xmlDocPtr doctree;
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xmlDocPtr restree;
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xmlDocPtr ssdoc = NULL;
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xmlChar *resstr;
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int resstat;
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int reslen;
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text *doct = PG_GETARG_TEXT_P(0);
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text *ssheet = PG_GETARG_TEXT_P(1);
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text *paramstr;
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text *tres;
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if (fcinfo->nargs == 3)
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{
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paramstr = PG_GETARG_TEXT_P(2);
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parse_params(params,paramstr);
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}
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else /* No parameters */
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{
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params[0] = NULL;
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}
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/* Setup parser */
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pgxml_parser_init();
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/* Check to see if document is a file or a literal */
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if (VARDATA(doct)[0] == '<')
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{
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doctree = xmlParseMemory((char *) VARDATA(doct), VARSIZE(doct)-VARHDRSZ);
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}
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else
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{
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doctree = xmlParseFile(GET_STR(doct));
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}
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if (doctree == NULL)
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{
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xmlCleanupParser();
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elog_error(ERROR,"Error parsing XML document",0);
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PG_RETURN_NULL();
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}
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/* Same for stylesheet */
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if (VARDATA(ssheet)[0] == '<')
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{
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ssdoc = xmlParseMemory((char *) VARDATA(ssheet),
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VARSIZE(ssheet)-VARHDRSZ);
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if (ssdoc == NULL)
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{
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xmlFreeDoc(doctree);
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xmlCleanupParser();
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elog_error(ERROR,"Error parsing stylesheet as XML document",0);
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PG_RETURN_NULL();
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}
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stylesheet = xsltParseStylesheetDoc(ssdoc);
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}
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else
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{
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stylesheet = xsltParseStylesheetFile(GET_STR(ssheet));
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}
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if (stylesheet == NULL)
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{
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xmlFreeDoc(doctree);
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xsltCleanupGlobals();
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xmlCleanupParser();
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elog_error(ERROR,"Failed to parse stylesheet",0);
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PG_RETURN_NULL();
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}
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restree = xsltApplyStylesheet(stylesheet, doctree, params);
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resstat = xsltSaveResultToString(&resstr, &reslen, restree, stylesheet);
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xsltFreeStylesheet(stylesheet);
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xmlFreeDoc(restree);
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xmlFreeDoc(doctree);
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xsltCleanupGlobals();
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xmlCleanupParser();
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if (resstat < 0) {
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PG_RETURN_NULL();
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}
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tres = palloc(reslen + VARHDRSZ);
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memcpy(VARDATA(tres),resstr,reslen);
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VARATT_SIZEP(tres) = reslen + VARHDRSZ;
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PG_RETURN_TEXT_P(tres);
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}
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void parse_params(const char **params, text *paramstr)
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{
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char *pos;
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char *pstr;
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int i;
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char *nvsep="=";
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char *itsep=",";
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pstr = GET_STR(paramstr);
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pos=pstr;
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for (i=0; i < MAXPARAMS; i++)
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{
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params[i] = pos;
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pos = strstr(pos,nvsep);
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if (pos != NULL) {
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*pos = '\0';
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pos++;
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} else {
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params[i]=NULL;
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break;
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}
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/* Value */
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i++;
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params[i]=pos;
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pos = strstr(pos,itsep);
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if (pos != NULL) {
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*pos = '\0';
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pos++;
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} else {
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break;
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}
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}
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if (i < MAXPARAMS)
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{
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params[i+1]=NULL;
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}
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}
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