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203 lines
4.0 KiB
C
203 lines
4.0 KiB
C
/*
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* contrib/xml2/xslt_proc.c
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*
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* XSLT processing functions (requiring libxslt)
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*
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* John Gray, for Torchbox 2003-04-01
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*/
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#include "postgres.h"
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#include "executor/spi.h"
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#include "fmgr.h"
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#include "funcapi.h"
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#include "miscadmin.h"
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#include "utils/builtins.h"
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#include "utils/xml.h"
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#ifdef USE_LIBXSLT
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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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#endif /* USE_LIBXSLT */
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/* externally accessible functions */
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Datum xslt_process(PG_FUNCTION_ARGS);
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#ifdef USE_LIBXSLT
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/* declarations to come from xpath.c */
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extern void pgxml_parser_init(void);
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/* local defs */
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static const char **parse_params(text *paramstr);
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#endif /* USE_LIBXSLT */
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PG_FUNCTION_INFO_V1(xslt_process);
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Datum
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xslt_process(PG_FUNCTION_ARGS)
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{
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#ifdef USE_LIBXSLT
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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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const char **params;
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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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if (fcinfo->nargs == 3)
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{
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paramstr = PG_GETARG_TEXT_P(2);
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params = parse_params(paramstr);
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}
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else
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{
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/* No parameters */
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params = (const char **) palloc(sizeof(char *));
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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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doctree = xmlParseMemory((char *) VARDATA(doct), VARSIZE(doct) - VARHDRSZ);
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else
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doctree = xmlParseFile(text_to_cstring(doct));
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if (doctree == NULL)
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xml_ereport(ERROR, ERRCODE_EXTERNAL_ROUTINE_EXCEPTION,
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"error parsing XML document");
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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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xml_ereport(ERROR, ERRCODE_EXTERNAL_ROUTINE_EXCEPTION,
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"error parsing stylesheet as XML document");
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}
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stylesheet = xsltParseStylesheetDoc(ssdoc);
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}
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else
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stylesheet = xsltParseStylesheetFile((xmlChar *) text_to_cstring(ssheet));
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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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xml_ereport(ERROR, ERRCODE_EXTERNAL_ROUTINE_EXCEPTION,
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"failed to parse stylesheet");
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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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if (resstat < 0)
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PG_RETURN_NULL();
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PG_RETURN_TEXT_P(cstring_to_text_with_len((char *) resstr, reslen));
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#else /* !USE_LIBXSLT */
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ereport(ERROR,
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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errmsg("xslt_process() is not available without libxslt")));
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PG_RETURN_NULL();
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#endif /* USE_LIBXSLT */
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}
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#ifdef USE_LIBXSLT
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static const char **
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parse_params(text *paramstr)
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{
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char *pos;
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char *pstr;
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char *nvsep = "=";
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char *itsep = ",";
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const char **params;
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int max_params;
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int nparams;
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pstr = text_to_cstring(paramstr);
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max_params = 20; /* must be even! */
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params = (const char **) palloc((max_params + 1) * sizeof(char *));
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nparams = 0;
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pos = pstr;
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while (*pos != '\0')
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{
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if (nparams >= max_params)
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{
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max_params *= 2;
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params = (const char **) repalloc(params,
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(max_params + 1) * sizeof(char *));
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}
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params[nparams++] = pos;
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pos = strstr(pos, nvsep);
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if (pos != NULL)
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{
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*pos = '\0';
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pos++;
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}
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else
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{
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/* No equal sign, so ignore this "parameter" */
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nparams--;
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break;
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}
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/* since max_params is even, we still have nparams < max_params */
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params[nparams++] = pos;
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pos = strstr(pos, itsep);
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if (pos != NULL)
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{
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*pos = '\0';
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pos++;
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}
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else
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break;
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}
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/* Add the terminator marker; we left room for it in the palloc's */
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params[nparams] = NULL;
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return params;
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}
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#endif /* USE_LIBXSLT */
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