xml.c 79 KB
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/*-------------------------------------------------------------------------
 *
 * xml.c
 *	  XML data type support.
 *
 *
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 * Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
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 * Portions Copyright (c) 1994, Regents of the University of California
 *
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 * $PostgreSQL: pgsql/src/backend/utils/adt/xml.c,v 1.49 2007/10/13 20:46:47 tgl Exp $
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 *
 *-------------------------------------------------------------------------
 */

/*
 * Generally, XML type support is only available when libxml use was
 * configured during the build.  But even if that is not done, the
 * type and all the functions are available, but most of them will
 * fail.  For one thing, this avoids having to manage variant catalog
 * installations.  But it also has nice effects such as that you can
 * dump a database containing XML type data even if the server is not
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 * linked with libxml.  Thus, make sure xml_out() works even if nothing
 * else does.
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 */

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/*
 * Note on memory management: Via callbacks, libxml is told to use
 * palloc and friends for memory management.  Sometimes, libxml
 * allocates global structures in the hope that it can reuse them
 * later on, but if "later" is much later, the memory context
 * management of PostgreSQL will have blown those structures away
 * without telling libxml about it.  Therefore, it is important to
 * call xmlCleanupParser() or perhaps some other cleanup function
 * after using such functions, for example something from
 * libxml/parser.h or libxml/xmlsave.h.  Unfortunately, you cannot
 * readily tell from the API documentation when that happens, so
 * careful evaluation is necessary when introducing new libxml APIs
 * here.
 */

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#include "postgres.h"

#ifdef USE_LIBXML
#include <libxml/chvalid.h>
#include <libxml/parser.h>
#include <libxml/tree.h>
#include <libxml/uri.h>
#include <libxml/xmlerror.h>
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#include <libxml/xmlwriter.h>
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#include <libxml/xpath.h>
#include <libxml/xpathInternals.h>
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#endif /* USE_LIBXML */

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#include "catalog/namespace.h"
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#include "catalog/pg_type.h"
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#include "commands/dbcommands.h"
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#include "executor/executor.h"
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#include "executor/spi.h"
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#include "fmgr.h"
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#include "lib/stringinfo.h"
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#include "libpq/pqformat.h"
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#include "mb/pg_wchar.h"
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#include "miscadmin.h"
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#include "nodes/execnodes.h"
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#include "parser/parse_expr.h"
#include "utils/array.h"
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#include "utils/builtins.h"
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#include "utils/date.h"
#include "utils/datetime.h"
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#include "utils/lsyscache.h"
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#include "utils/memutils.h"
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#include "access/tupmacs.h"
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#include "utils/xml.h"


#ifdef USE_LIBXML

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static StringInfo xml_err_buf = NULL;
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static void 	xml_init(void);
static void    *xml_palloc(size_t size);
static void    *xml_repalloc(void *ptr, size_t size);
static void 	xml_pfree(void *ptr);
static char    *xml_pstrdup(const char *string);
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static void 	xml_ereport(int level, int sqlcode,
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							const char *msg);
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static void 	xml_errorHandler(void *ctxt, const char *msg, ...);
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static void 	xml_ereport_by_code(int level, int sqlcode,
									const char *msg, int errcode);
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static xmlChar *xml_text2xmlChar(text *in);
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static int		parse_xml_decl(const xmlChar *str, size_t *lenp, xmlChar **version, xmlChar **encoding, int *standalone);
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static bool		print_xml_decl(StringInfo buf, const xmlChar *version, pg_enc encoding, int standalone);
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static xmlDocPtr xml_parse(text *data, XmlOptionType xmloption_arg, bool preserve_whitespace, xmlChar *encoding);
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static text		*xml_xmlnodetoxmltype(xmlNodePtr cur);
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#endif /* USE_LIBXML */

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static StringInfo query_to_xml_internal(const char *query, char *tablename, const char *xmlschema, bool nulls, bool tableforest, const char *targetns, bool top_level);
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static const char * map_sql_table_to_xmlschema(TupleDesc tupdesc, Oid relid, bool nulls, bool tableforest, const char *targetns);
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static const char * map_sql_schema_to_xmlschema_types(Oid nspid, List *relid_list, bool nulls, bool tableforest, const char *targetns);
static const char * map_sql_catalog_to_xmlschema_types(List *nspid_list, bool nulls, bool tableforest, const char *targetns);
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static const char * map_sql_type_to_xml_name(Oid typeoid, int typmod);
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static const char * map_sql_typecoll_to_xmlschema_types(List *tupdesc_list);
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static const char * map_sql_type_to_xmlschema_type(Oid typeoid, int typmod);
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static void SPI_sql_row_to_xmlelement(int rownum, StringInfo result, char *tablename, bool nulls, bool tableforest, const char *targetns, bool top_level);
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XmlBinaryType xmlbinary;
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XmlOptionType xmloption;

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#define NO_XML_SUPPORT() \
	ereport(ERROR, \
			(errcode(ERRCODE_FEATURE_NOT_SUPPORTED), \
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			 errmsg("unsupported XML feature"), \
			 errdetail("This functionality requires libxml support."), \
			 errhint("You need to re-compile PostgreSQL using --with-libxml.")))
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#define _textin(str) DirectFunctionCall1(textin, CStringGetDatum(str))
#define _textout(x) DatumGetCString(DirectFunctionCall1(textout, PointerGetDatum(x)))


/* from SQL/XML:2003 section 4.7 */
#define NAMESPACE_XSD "http://www.w3.org/2001/XMLSchema"
#define NAMESPACE_XSI "http://www.w3.org/2001/XMLSchema-instance"
#define NAMESPACE_SQLXML "http://standards.iso.org/iso/9075/2003/sqlxml"


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#ifdef USE_LIBXML

static int
xmlChar_to_encoding(xmlChar *encoding_name)
{
	int		encoding = pg_char_to_encoding((char *) encoding_name);

	if (encoding < 0)
		ereport(ERROR,
				(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
				 errmsg("invalid encoding name \"%s\"",
						(char *) encoding_name)));
	return encoding;
}

#endif


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Datum
xml_in(PG_FUNCTION_ARGS)
{
#ifdef USE_LIBXML
	char		*s = PG_GETARG_CSTRING(0);
	size_t		len;
	xmltype		*vardata;
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	xmlDocPtr	 doc;
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	len = strlen(s);
	vardata = palloc(len + VARHDRSZ);
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	SET_VARSIZE(vardata, len + VARHDRSZ);
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	memcpy(VARDATA(vardata), s, len);

	/*
	 * Parse the data to check if it is well-formed XML data.  Assume
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	 * that ERROR occurred if parsing failed.
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	 */
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	doc = xml_parse(vardata, xmloption, true, NULL);
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	xmlFreeDoc(doc);
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	PG_RETURN_XML_P(vardata);
#else
	NO_XML_SUPPORT();
	return 0;
#endif
}


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#define PG_XML_DEFAULT_VERSION "1.0"


static char *
xml_out_internal(xmltype *x, pg_enc target_encoding)
{
	char		*str;
	size_t		len;
#ifdef USE_LIBXML
	xmlChar		*version;
	xmlChar		*encoding;
	int			standalone;
	int			res_code;
#endif

	len = VARSIZE(x) - VARHDRSZ;
	str = palloc(len + 1);
	memcpy(str, VARDATA(x), len);
	str[len] = '\0';

#ifdef USE_LIBXML
	if ((res_code = parse_xml_decl((xmlChar *) str, &len, &version, &encoding, &standalone)) == 0)
	{
		StringInfoData buf;

		initStringInfo(&buf);

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		if (!print_xml_decl(&buf, version, target_encoding, standalone))
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		{
			/*
			 * If we are not going to produce an XML declaration, eat
			 * a single newline in the original string to prevent
			 * empty first lines in the output.
			 */
			if (*(str + len) == '\n')
				len += 1;
		}
		appendStringInfoString(&buf, str + len);

		return buf.data;
	}

	xml_ereport_by_code(WARNING, ERRCODE_INTERNAL_ERROR,
						"could not parse XML declaration in stored value", res_code);
#endif
	return str;
}


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Datum
xml_out(PG_FUNCTION_ARGS)
{
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	xmltype	   *x = PG_GETARG_XML_P(0);
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	/*
	 * xml_out removes the encoding property in all cases.  This is
	 * because we cannot control from here whether the datum will be
	 * converted to a different client encoding, so we'd do more harm
	 * than good by including it.
	 */
	PG_RETURN_CSTRING(xml_out_internal(x, 0));
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}


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Datum
xml_recv(PG_FUNCTION_ARGS)
{
#ifdef USE_LIBXML
	StringInfo	buf = (StringInfo) PG_GETARG_POINTER(0);
	xmltype	   *result;
	char	   *str;
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	char	   *newstr;
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	int			nbytes;
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	xmlDocPtr	doc;
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	xmlChar	   *encoding = NULL;
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	/*
	 * Read the data in raw format. We don't know yet what the encoding
	 * is, as that information is embedded in the xml declaration; so we
	 * have to parse that before converting to server encoding.
	 */
	nbytes = buf->len - buf->cursor;
	str = (char *) pq_getmsgbytes(buf, nbytes);
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	/*
	 * We need a null-terminated string to pass to parse_xml_decl().  Rather
	 * than make a separate copy, make the temporary result one byte bigger
	 * than it needs to be.
	 */
	result = palloc(nbytes + 1 + VARHDRSZ);
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	SET_VARSIZE(result, nbytes + VARHDRSZ);
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	memcpy(VARDATA(result), str, nbytes);
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	str = VARDATA(result);
	str[nbytes] = '\0';
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	parse_xml_decl((xmlChar *) str, NULL, NULL, &encoding, NULL);
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	/*
	 * Parse the data to check if it is well-formed XML data.  Assume
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	 * that xml_parse will throw ERROR if not.
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	 */
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	doc = xml_parse(result, xmloption, true, encoding);
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	xmlFreeDoc(doc);
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	/* Now that we know what we're dealing with, convert to server encoding */
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	newstr = (char *) pg_do_encoding_conversion((unsigned char *) str,
												nbytes,
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												encoding ?
												xmlChar_to_encoding(encoding) :
												PG_UTF8,
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												GetDatabaseEncoding());

	if (newstr != str)
	{
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		pfree(result);
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		nbytes = strlen(newstr);

		result = palloc(nbytes + VARHDRSZ);
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		SET_VARSIZE(result, nbytes + VARHDRSZ);
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		memcpy(VARDATA(result), newstr, nbytes);
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		pfree(newstr);
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	}

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	PG_RETURN_XML_P(result);
#else
	NO_XML_SUPPORT();
	return 0;
#endif
}


Datum
xml_send(PG_FUNCTION_ARGS)
{
	xmltype	   *x = PG_GETARG_XML_P(0);
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	char	   *outval;
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	StringInfoData buf;
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	/*
	 * xml_out_internal doesn't convert the encoding, it just prints
	 * the right declaration. pq_sendtext will do the conversion.
	 */
	outval = xml_out_internal(x, pg_get_client_encoding());
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	pq_begintypsend(&buf);
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	pq_sendtext(&buf, outval, strlen(outval));
	pfree(outval);
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	PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
}


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#ifdef USE_LIBXML
static void
appendStringInfoText(StringInfo str, const text *t)
{
	appendBinaryStringInfo(str, VARDATA(t), VARSIZE(t) - VARHDRSZ);
}
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#endif
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static xmltype *
stringinfo_to_xmltype(StringInfo buf)
{
	int32 len;
	xmltype *result;

	len = buf->len + VARHDRSZ;
	result = palloc(len);
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	SET_VARSIZE(result, len);
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	memcpy(VARDATA(result), buf->data, buf->len);

	return result;
}
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static xmltype *
cstring_to_xmltype(const char *string)
{
	int32		len;
	xmltype	   *result;

	len = strlen(string) + VARHDRSZ;
	result = palloc(len);
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	SET_VARSIZE(result, len);
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	memcpy(VARDATA(result), string, len - VARHDRSZ);

	return result;
}


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#ifdef USE_LIBXML
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static xmltype *
xmlBuffer_to_xmltype(xmlBufferPtr buf)
{
	int32		len;
	xmltype	   *result;

	len = xmlBufferLength(buf) + VARHDRSZ;
	result = palloc(len);
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	SET_VARSIZE(result, len);
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	memcpy(VARDATA(result), xmlBufferContent(buf), len - VARHDRSZ);

	return result;
}
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#endif


Datum
xmlcomment(PG_FUNCTION_ARGS)
{
#ifdef USE_LIBXML
	text *arg = PG_GETARG_TEXT_P(0);
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	int len =  VARSIZE(arg) - VARHDRSZ;
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	StringInfoData buf;
	int i;

	/* check for "--" in string or "-" at the end */
	for (i = 1; i < len; i++)
		if ((VARDATA(arg)[i] == '-' && VARDATA(arg)[i - 1] == '-')
			|| (VARDATA(arg)[i] == '-' && i == len - 1))
					ereport(ERROR,
							(errcode(ERRCODE_INVALID_XML_COMMENT),
							 errmsg("invalid XML comment")));

	initStringInfo(&buf);
	appendStringInfo(&buf, "<!--");
	appendStringInfoText(&buf, arg);
	appendStringInfo(&buf, "-->");

	PG_RETURN_XML_P(stringinfo_to_xmltype(&buf));
#else
	NO_XML_SUPPORT();
	return 0;
#endif
}


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/*
 * TODO: xmlconcat needs to merge the notations and unparsed entities
 * of the argument values.  Not very important in practice, though.
 */
xmltype *
xmlconcat(List *args)
{
#ifdef USE_LIBXML
	StringInfoData buf;
	ListCell   *v;

	int			global_standalone = 1;
	xmlChar	   *global_version = NULL;
	bool		global_version_no_value = false;

	initStringInfo(&buf);
	foreach(v, args)
	{
		size_t		len;
		xmlChar	   *version;
		int			standalone;
		xmltype	   *x = DatumGetXmlP(PointerGetDatum(lfirst(v)));
		char	   *str;

		len = VARSIZE(x) - VARHDRSZ;
		str = palloc(len + 1);
		memcpy(str, VARDATA(x), len);
		str[len] = '\0';

		parse_xml_decl((xmlChar *) str, &len, &version, NULL, &standalone);

		if (standalone == 0 && global_standalone == 1)
			global_standalone = 0;
		if (standalone < 0)
			global_standalone = -1;

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		if (!version)
			global_version_no_value = true;
		else if (!global_version)
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			global_version = xmlStrdup(version);
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		else if (xmlStrcmp(version, global_version) != 0)
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			global_version_no_value = true;

		appendStringInfoString(&buf, str + len);
		pfree(str);
	}

	if (!global_version_no_value || global_standalone >= 0)
	{
		StringInfoData buf2;

		initStringInfo(&buf2);

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		print_xml_decl(&buf2,
					   (!global_version_no_value && global_version) ? global_version : NULL,
					   0,
					   global_standalone);
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		appendStringInfoString(&buf2, buf.data);
		buf = buf2;
	}

	return stringinfo_to_xmltype(&buf);
#else
	NO_XML_SUPPORT();
	return NULL;
#endif
}


/*
 * XMLAGG support
 */
Datum
xmlconcat2(PG_FUNCTION_ARGS)
{
	if (PG_ARGISNULL(0))
	{
		if (PG_ARGISNULL(1))
			PG_RETURN_NULL();
		else
			PG_RETURN_XML_P(PG_GETARG_XML_P(1));
	}
	else if (PG_ARGISNULL(1))
		PG_RETURN_XML_P(PG_GETARG_XML_P(0));
	else
		PG_RETURN_XML_P(xmlconcat(list_make2(PG_GETARG_XML_P(0), PG_GETARG_XML_P(1))));
}


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Datum
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texttoxml(PG_FUNCTION_ARGS)
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{
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	text	   *data = PG_GETARG_TEXT_P(0);
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	PG_RETURN_XML_P(xmlparse(data, xmloption, true));
}


Datum
xmltotext(PG_FUNCTION_ARGS)
{
	xmltype	   *data = PG_GETARG_XML_P(0);

	PG_RETURN_TEXT_P(xmltotext_with_xmloption(data, xmloption));
}


text *
xmltotext_with_xmloption(xmltype *data, XmlOptionType xmloption_arg)
{
	if (xmloption_arg == XMLOPTION_DOCUMENT && !xml_is_document(data))
		ereport(ERROR,
				(errcode(ERRCODE_NOT_AN_XML_DOCUMENT),
				 errmsg("not an XML document")));

	/* It's actually binary compatible, save for the above check. */
	return (text *) data;
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}
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xmltype *
xmlelement(XmlExprState *xmlExpr, ExprContext *econtext)
{
#ifdef USE_LIBXML
	XmlExpr	   *xexpr = (XmlExpr *) xmlExpr->xprstate.expr;
	int			i;
	ListCell   *arg;
	ListCell   *narg;
	bool		isnull;
	xmltype	   *result;
	Datum		value;
	char	   *str;

	xmlBufferPtr buf;
	xmlTextWriterPtr writer;

	buf = xmlBufferCreate();
	writer = xmlNewTextWriterMemory(buf, 0);

	xmlTextWriterStartElement(writer, (xmlChar *) xexpr->name);

	i = 0;
	forboth(arg, xmlExpr->named_args, narg, xexpr->arg_names)
	{
		ExprState 	*e = (ExprState *) lfirst(arg);
		char	*argname = strVal(lfirst(narg));

		value = ExecEvalExpr(e, econtext, &isnull, NULL);
		if (!isnull)
		{
			str = OutputFunctionCall(&xmlExpr->named_outfuncs[i], value);
			xmlTextWriterWriteAttribute(writer, (xmlChar *) argname, (xmlChar *) str);
			pfree(str);
		}
		i++;
	}

	foreach(arg, xmlExpr->args)
	{
		ExprState 	*e = (ExprState *) lfirst(arg);

		value = ExecEvalExpr(e, econtext, &isnull, NULL);
		if (!isnull)
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			xmlTextWriterWriteRaw(writer, (xmlChar *) map_sql_value_to_xml_value(value, exprType((Node *) e->expr)));
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	}

	xmlTextWriterEndElement(writer);
	xmlFreeTextWriter(writer);

	result = xmlBuffer_to_xmltype(buf);
	xmlBufferFree(buf);
	return result;
#else
	NO_XML_SUPPORT();
	return NULL;
#endif
}


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xmltype *
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xmlparse(text *data, XmlOptionType xmloption_arg, bool preserve_whitespace)
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{
#ifdef USE_LIBXML
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	xmlDocPtr	doc;

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	doc = xml_parse(data, xmloption_arg, preserve_whitespace, NULL);
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	xmlFreeDoc(doc);
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	return (xmltype *) data;
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#else
	NO_XML_SUPPORT();
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	return NULL;
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#endif
}


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xmltype *
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xmlpi(char *target, text *arg, bool arg_is_null, bool *result_is_null)
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{
#ifdef USE_LIBXML
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	xmltype *result;
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	StringInfoData buf;

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	if (pg_strncasecmp(target, "xml", 3) == 0)
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		ereport(ERROR,
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				(errcode(ERRCODE_SYNTAX_ERROR),	/* really */
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				 errmsg("invalid XML processing instruction"),
				 errdetail("XML processing instruction target name cannot start with \"xml\".")));

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	/*
	 * Following the SQL standard, the null check comes after the
	 * syntax check above.
	 */
	*result_is_null = arg_is_null;
	if (*result_is_null)
		return NULL;		

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	initStringInfo(&buf);

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	appendStringInfo(&buf, "<?%s", target);

	if (arg != NULL)
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	{
		char *string;

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		string = DatumGetCString(DirectFunctionCall1(textout,
													 PointerGetDatum(arg)));
		if (strstr(string, "?>") != NULL)
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		ereport(ERROR,
				(errcode(ERRCODE_INVALID_XML_PROCESSING_INSTRUCTION),
				 errmsg("invalid XML processing instruction"),
				 errdetail("XML processing instruction cannot contain \"?>\".")));

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		appendStringInfoChar(&buf, ' ');
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		appendStringInfoString(&buf, string + strspn(string, " "));
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		pfree(string);
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	}
	appendStringInfoString(&buf, "?>");

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	result = stringinfo_to_xmltype(&buf);
	pfree(buf.data);
	return result;
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#else
	NO_XML_SUPPORT();
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	return NULL;
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#endif
}


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xmltype *
xmlroot(xmltype *data, text *version, int standalone)
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{
#ifdef USE_LIBXML
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	char	   *str;
	size_t		len;
	xmlChar	   *orig_version;
	int			orig_standalone;
	StringInfoData buf;
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	len = VARSIZE(data) - VARHDRSZ;
	str = palloc(len + 1);
	memcpy(str, VARDATA(data), len);
	str[len] = '\0';

	parse_xml_decl((xmlChar *) str, &len, &orig_version, NULL, &orig_standalone);
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	if (version)
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		orig_version = xml_text2xmlChar(version);
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	else
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		orig_version = NULL;
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	switch (standalone)
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	{
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		case XML_STANDALONE_YES:
			orig_standalone = 1;
			break;
		case XML_STANDALONE_NO:
			orig_standalone = 0;
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			break;
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		case XML_STANDALONE_NO_VALUE:
			orig_standalone = -1;
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			break;
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		case XML_STANDALONE_OMITTED:
			/* leave original value */
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			break;
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	}

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	initStringInfo(&buf);
	print_xml_decl(&buf, orig_version, 0, orig_standalone);
	appendStringInfoString(&buf, str + len);
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	return stringinfo_to_xmltype(&buf);
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#else
	NO_XML_SUPPORT();
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	return NULL;
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#endif
}


/*
 * Validate document (given as string) against DTD (given as external link)
 * TODO !!! use text instead of cstring for second arg
 * TODO allow passing DTD as a string value (not only as an URI)
 * TODO redesign (see comment with '!!!' below)
 */
Datum
xmlvalidate(PG_FUNCTION_ARGS)
{
#ifdef USE_LIBXML
	text				*data = PG_GETARG_TEXT_P(0);
	text				*dtdOrUri = PG_GETARG_TEXT_P(1);
729 730 731 732
	bool				result = false;
	xmlParserCtxtPtr	ctxt = NULL;
	xmlDocPtr 			doc = NULL;
	xmlDtdPtr			dtd = NULL;
733 734 735

	xml_init();

736 737 738 739 740 741
	/* We use a PG_TRY block to ensure libxml is cleaned up on error */
	PG_TRY();
	{
		ctxt = xmlNewParserCtxt();
		if (ctxt == NULL)
			xml_ereport(ERROR, ERRCODE_INTERNAL_ERROR,
742
						"could not allocate parser context");
743 744 745

		doc = xmlCtxtReadMemory(ctxt, (char *) VARDATA(data),
								VARSIZE(data) - VARHDRSZ,
746
								NULL, NULL, 0);
747 748
		if (doc == NULL)
			xml_ereport(ERROR, ERRCODE_INVALID_XML_DOCUMENT,
749
						"could not parse XML data");
750 751

#if 0
752 753 754 755 756 757
		uri = xmlCreateURI();
		elog(NOTICE, "dtd - %s", dtdOrUri);
		dtd = palloc(sizeof(xmlDtdPtr));
		uri = xmlParseURI(dtdOrUri);
		if (uri == NULL)
			xml_ereport(ERROR, ERRCODE_INTERNAL_ERROR,
758
						"not implemented yet... (TODO)");
759
		else
760
#endif
761 762 763 764
			dtd = xmlParseDTD(NULL, xml_text2xmlChar(dtdOrUri));

		if (dtd == NULL)
			xml_ereport(ERROR, ERRCODE_INVALID_XML_DOCUMENT,
765
						"could not load DTD");
766 767 768 769 770 771

		if (xmlValidateDtd(xmlNewValidCtxt(), doc, dtd) == 1)
			result = true;

		if (!result)
			xml_ereport(NOTICE, ERRCODE_INVALID_XML_DOCUMENT,
772
						"validation against DTD failed");
773 774

#if 0
775 776
		if (uri)
			xmlFreeURI(uri);
777
		uri = NULL;
778
#endif
779 780
		if (dtd)
			xmlFreeDtd(dtd);
781
		dtd = NULL;
782 783
		if (doc)
			xmlFreeDoc(doc);
784
		doc = NULL;
785 786
		if (ctxt)
			xmlFreeParserCtxt(ctxt);
787
		ctxt = NULL;
788
		xmlCleanupParser();
789
	}
790 791
	PG_CATCH();
	{
792
#if 0
793 794
		if (uri)
			xmlFreeURI(uri);
795
#endif
796 797 798 799 800 801 802
		if (dtd)
			xmlFreeDtd(dtd);
		if (doc)
			xmlFreeDoc(doc);
		if (ctxt)
			xmlFreeParserCtxt(ctxt);
		xmlCleanupParser();
803

804 805 806
		PG_RE_THROW();
	}
	PG_END_TRY();
807 808 809 810 811 812 813 814 815

	PG_RETURN_BOOL(result);
#else /* not USE_LIBXML */
	NO_XML_SUPPORT();
	return 0;
#endif /* not USE_LIBXML */
}


816 817 818 819 820 821 822 823 824 825
bool
xml_is_document(xmltype *arg)
{
#ifdef USE_LIBXML
	bool		result;
	xmlDocPtr	doc = NULL;
	MemoryContext ccxt = CurrentMemoryContext;

	PG_TRY();
	{
826
		doc = xml_parse((text *) arg, XMLOPTION_DOCUMENT, true, NULL);
827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859
		result = true;
	}
	PG_CATCH();
	{
		ErrorData *errdata;
		MemoryContext ecxt;

		ecxt = MemoryContextSwitchTo(ccxt);
		errdata = CopyErrorData();
		if (errdata->sqlerrcode == ERRCODE_INVALID_XML_DOCUMENT)
		{
			FlushErrorState();
			result = false;
		}
		else
		{
			MemoryContextSwitchTo(ecxt);
			PG_RE_THROW();
		}
	}
	PG_END_TRY();

	if (doc)
		xmlFreeDoc(doc);

	return result;
#else /* not USE_LIBXML */
	NO_XML_SUPPORT();
	return false;
#endif /* not USE_LIBXML */
}


860 861 862 863 864 865 866 867 868 869 870 871 872 873
#ifdef USE_LIBXML

/*
 * Container for some init stuff (not good design!)
 * TODO xmlChar is utf8-char, make proper tuning (initdb with enc!=utf8 and check)
 */
static void
xml_init(void)
{
	/*
	 * Currently, we have no pure UTF-8 support for internals -- check
	 * if we can work.
	 */
	if (sizeof (char) != sizeof (xmlChar))
874 875 876 877 878
		ereport(ERROR,
				(errmsg("could not initialize XML library"),
				 errdetail("libxml2 has incompatible char type: sizeof(char)=%u, sizeof(xmlChar)=%u.",
						   (int) sizeof(char), (int) sizeof(xmlChar))));

879 880 881 882 883 884 885 886 887 888 889 890
	if (xml_err_buf == NULL)
	{
		/* First time through: create error buffer in permanent context */
		MemoryContext oldcontext;

		oldcontext = MemoryContextSwitchTo(TopMemoryContext);
		xml_err_buf = makeStringInfo();
		MemoryContextSwitchTo(oldcontext);
	}
	else
	{
		/* Reset pre-existing buffer to empty */
891
		resetStringInfo(xml_err_buf);
892 893 894 895
	}
	/* Now that xml_err_buf exists, safe to call xml_errorHandler */
	xmlSetGenericErrorFunc(NULL, xml_errorHandler);

896
	xmlMemSetup(xml_pfree, xml_palloc, xml_repalloc, xml_pstrdup);
897

898 899 900 901 902
	xmlInitParser();
	LIBXML_TEST_VERSION;
}


903 904 905 906 907 908 909 910 911 912 913 914 915
/*
 * SQL/XML allows storing "XML documents" or "XML content".  "XML
 * documents" are specified by the XML specification and are parsed
 * easily by libxml.  "XML content" is specified by SQL/XML as the
 * production "XMLDecl? content".  But libxml can only parse the
 * "content" part, so we have to parse the XML declaration ourselves
 * to complete this.
 */

#define CHECK_XML_SPACE(p) if (!xmlIsBlank_ch(*(p))) return XML_ERR_SPACE_REQUIRED
#define SKIP_XML_SPACE(p) while (xmlIsBlank_ch(*(p))) (p)++

static int
916
parse_xml_decl(const xmlChar *str, size_t *lenp, xmlChar **version, xmlChar **encoding, int *standalone)
917 918 919
{
	const xmlChar *p;
	const xmlChar *save_p;
920
	size_t		len;
921 922 923

	p = str;

924 925 926 927 928 929 930
	if (version)
		*version = NULL;
	if (encoding)
		*encoding = NULL;
	if (standalone)
		*standalone = -1;

931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946
	if (xmlStrncmp(p, (xmlChar *)"<?xml", 5) != 0)
		goto finished;

	p += 5;

	/* version */
	CHECK_XML_SPACE(p);
	SKIP_XML_SPACE(p);
	if (xmlStrncmp(p, (xmlChar *)"version", 7) != 0)
		return XML_ERR_VERSION_MISSING;
	p += 7;
	SKIP_XML_SPACE(p);
	if (*p != '=')
		return XML_ERR_VERSION_MISSING;
	p += 1;
	SKIP_XML_SPACE(p);
947 948 949 950 951 952 953 954 955 956 957 958 959 960

	if (*p == '\'' || *p == '"')
	{
		const xmlChar *q;

		q = xmlStrchr(p + 1, *p);
		if (!q)
			return XML_ERR_VERSION_MISSING;

		if (version)
			*version = xmlStrndup(p + 1, q - p - 1);
		p = q + 1;
	}
	else
961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983
		return XML_ERR_VERSION_MISSING;

	/* encoding */
	save_p = p;
	SKIP_XML_SPACE(p);
	if (xmlStrncmp(p, (xmlChar *)"encoding", 8) == 0)
	{
		CHECK_XML_SPACE(save_p);
		p += 8;
		SKIP_XML_SPACE(p);
		if (*p != '=')
			return XML_ERR_MISSING_ENCODING;
		p += 1;
		SKIP_XML_SPACE(p);

		if (*p == '\'' || *p == '"')
		{
			const xmlChar *q;

			q = xmlStrchr(p + 1, *p);
			if (!q)
				return XML_ERR_MISSING_ENCODING;

984
			if (encoding)
985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031
			*encoding = xmlStrndup(p + 1, q - p - 1);
			p = q + 1;
		}
		else
			return XML_ERR_MISSING_ENCODING;
	}
	else
	{
		p = save_p;
	}

	/* standalone */
	save_p = p;
	SKIP_XML_SPACE(p);
	if (xmlStrncmp(p, (xmlChar *)"standalone", 10) == 0)
	{
		CHECK_XML_SPACE(save_p);
		p += 10;
		SKIP_XML_SPACE(p);
		if (*p != '=')
			return XML_ERR_STANDALONE_VALUE;
		p += 1;
		SKIP_XML_SPACE(p);
		if (xmlStrncmp(p, (xmlChar *)"'yes'", 5) == 0 || xmlStrncmp(p, (xmlChar *)"\"yes\"", 5) == 0)
		{
			*standalone = 1;
			p += 5;
		}
		else if (xmlStrncmp(p, (xmlChar *)"'no'", 4) == 0 || xmlStrncmp(p, (xmlChar *)"\"no\"", 4) == 0)
		{
			*standalone = 0;
			p += 4;
		}
		else
			return XML_ERR_STANDALONE_VALUE;
	}
	else
	{
		p = save_p;
	}

	SKIP_XML_SPACE(p);
	if (xmlStrncmp(p, (xmlChar *)"?>", 2) != 0)
		return XML_ERR_XMLDECL_NOT_FINISHED;
	p += 2;

finished:
1032 1033 1034 1035 1036 1037 1038 1039 1040
	len = p - str;

	for (p = str; p < str + len; p++)
		if (*p > 127)
			return XML_ERR_INVALID_CHAR;

	if (lenp)
		*lenp = len;

1041 1042 1043 1044
	return XML_ERR_OK;
}


1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091
/*
 * Write an XML declaration.  On output, we adjust the XML declaration
 * as follows.  (These rules are the moral equivalent of the clause
 * "Serialization of an XML value" in the SQL standard.)
 *
 * We try to avoid generating an XML declaration if possible.  This is
 * so that you don't get trivial things like xml '<foo/>' resulting in
 * '<?xml version="1.0"?><foo/>', which would surely be annoying.  We
 * must provide a declaration if the standalone property is specified
 * or if we include an encoding declaration.  If we have a
 * declaration, we must specify a version (XML requires this).
 * Otherwise we only make a declaration if the version is not "1.0",
 * which is the default version specified in SQL:2003.
 */
static bool
print_xml_decl(StringInfo buf, const xmlChar *version, pg_enc encoding, int standalone)
{
	if ((version && strcmp((char *) version, PG_XML_DEFAULT_VERSION) != 0)
		|| (encoding && encoding != PG_UTF8)
		|| standalone != -1)
	{
		appendStringInfoString(buf, "<?xml");

		if (version)
			appendStringInfo(buf, " version=\"%s\"", version);
		else
			appendStringInfo(buf, " version=\"%s\"", PG_XML_DEFAULT_VERSION);

		if (encoding && encoding != PG_UTF8)
			/* XXX might be useful to convert this to IANA names
			 * (ISO-8859-1 instead of LATIN1 etc.); needs field
			 * experience */
			appendStringInfo(buf, " encoding=\"%s\"", pg_encoding_to_char(encoding));

		if (standalone == 1)
			appendStringInfoString(buf, " standalone=\"yes\"");
		else if (standalone == 0)
			appendStringInfoString(buf, " standalone=\"no\"");
		appendStringInfoString(buf, "?>");

		return true;
	}
	else
		return false;
}


1092 1093
/*
 * Convert a C string to XML internal representation
1094
 *
1095 1096 1097
 * TODO maybe, libxml2's xmlreader is better? (do not construct DOM, yet do not use SAX - see xml_reader.c)
 */
static xmlDocPtr
1098
xml_parse(text *data, XmlOptionType xmloption_arg, bool preserve_whitespace, xmlChar *encoding)
1099 1100 1101
{
	int32				len;
	xmlChar				*string;
1102
	xmlChar				*utf8string;
1103 1104
	xmlParserCtxtPtr 	ctxt = NULL;
	xmlDocPtr 			doc = NULL;
1105 1106 1107

	len = VARSIZE(data) - VARHDRSZ; /* will be useful later */
	string = xml_text2xmlChar(data);
1108

1109 1110
	utf8string = pg_do_encoding_conversion(string,
										   len,
1111 1112 1113
										   encoding ?
										   xmlChar_to_encoding(encoding) :
										   GetDatabaseEncoding(),
1114 1115
										   PG_UTF8);

1116
	xml_init();
1117

1118 1119
	/* We use a PG_TRY block to ensure libxml is cleaned up on error */
	PG_TRY();
1120
	{
1121 1122 1123
		ctxt = xmlNewParserCtxt();
		if (ctxt == NULL)
			xml_ereport(ERROR, ERRCODE_INTERNAL_ERROR,
1124
						"could not allocate parser context");
1125

1126
		if (xmloption_arg == XMLOPTION_DOCUMENT)
1127
		{
1128 1129 1130 1131 1132 1133 1134
			/*
			 * Note, that here we try to apply DTD defaults
			 * (XML_PARSE_DTDATTR) according to SQL/XML:10.16.7.d:
			 * 'Default valies defined by internal DTD are applied'.
			 * As for external DTDs, we try to support them too, (see
			 * SQL/XML:10.16.7.e)
			 */
1135
			doc = xmlCtxtReadDoc(ctxt, utf8string,
1136
								 NULL,
1137
								 "UTF-8",
1138 1139
								 XML_PARSE_NOENT | XML_PARSE_DTDATTR
								 | (preserve_whitespace ? 0 : XML_PARSE_NOBLANKS));
1140 1141
			if (doc == NULL)
				xml_ereport(ERROR, ERRCODE_INVALID_XML_DOCUMENT,
1142
							"invalid XML document");
1143
		}
1144
		else
1145
		{
1146
			int			res_code;
1147
			size_t count;
1148
			xmlChar	   *version = NULL;
1149 1150
			int standalone = -1;

1151
			doc = xmlNewDoc(NULL);
1152

1153
			res_code = parse_xml_decl(utf8string, &count, &version, NULL, &standalone);
1154
			if (res_code != 0)
1155
				xml_ereport_by_code(ERROR, ERRCODE_INVALID_XML_CONTENT,
1156 1157 1158 1159 1160 1161
									"invalid XML content: invalid XML declaration", res_code);

			res_code = xmlParseBalancedChunkMemory(doc, NULL, NULL, 0, utf8string + count, NULL);
			if (res_code != 0)
				xml_ereport(ERROR, ERRCODE_INVALID_XML_CONTENT,
							"invalid XML content");
1162

1163 1164
			doc->version = xmlStrdup(version);
			doc->encoding = xmlStrdup((xmlChar *) "UTF-8");
1165
			doc->standalone = standalone;
1166 1167
		}

1168 1169
		if (ctxt)
			xmlFreeParserCtxt(ctxt);
1170
		ctxt = NULL;
1171
		xmlCleanupParser();
1172
	}
1173 1174 1175 1176 1177 1178 1179
	PG_CATCH();
	{
		if (doc)
			xmlFreeDoc(doc);
		if (ctxt)
			xmlFreeParserCtxt(ctxt);
		xmlCleanupParser();
1180

1181 1182 1183
		PG_RE_THROW();
	}
	PG_END_TRY();
1184

1185 1186 1187 1188
	return doc;
}


1189 1190
/*
 * xmlChar<->text convertions
1191 1192 1193 1194 1195 1196 1197 1198 1199 1200
 */
static xmlChar *
xml_text2xmlChar(text *in)
{
	int32 		len = VARSIZE(in) - VARHDRSZ;
	xmlChar		*res;

	res = palloc(len + 1);
	memcpy(res, VARDATA(in), len);
	res[len] = '\0';
1201

1202 1203 1204 1205
	return(res);
}


1206 1207
/*
 * Wrappers for memory management functions
1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237
 */
static void *
xml_palloc(size_t size)
{
	return palloc(size);
}


static void *
xml_repalloc(void *ptr, size_t size)
{
	return repalloc(ptr, size);
}


static void
xml_pfree(void *ptr)
{
	pfree(ptr);
}


static char *
xml_pstrdup(const char *string)
{
	return pstrdup(string);
}


/*
1238 1239 1240 1241
 * Wrapper for "ereport" function for XML-related errors.  The "msg"
 * is the SQL-level message; some can be adopted from the SQL/XML
 * standard.  This function adds libxml's native error messages, if
 * any, as detail.
1242 1243
 */
static void
1244
xml_ereport(int level, int sqlcode,
1245
			const char *msg)
1246
{
1247
	char *detail;
1248

1249
	if (xml_err_buf->len > 0)
1250
	{
1251
		detail = pstrdup(xml_err_buf->data);
1252
		resetStringInfo(xml_err_buf);
1253
	}
1254 1255
	else
		detail = NULL;
1256

1257 1258
	/* libxml error messages end in '\n'; get rid of it */
	if (detail)
1259
	{
1260 1261 1262 1263 1264 1265
		size_t len;

		len = strlen(detail);
		if (len > 0 && detail[len-1] == '\n')
			detail[len-1] = '\0';

1266 1267
		ereport(level,
				(errcode(sqlcode),
1268 1269
				 errmsg("%s", msg),
				 errdetail("%s", detail)));
1270 1271 1272
	}
	else
	{
1273 1274
		ereport(level,
				(errcode(sqlcode),
1275
				 errmsg("%s", msg)));
1276 1277 1278 1279 1280 1281 1282 1283 1284 1285
	}
}


/*
 * Error handler for libxml error messages
 */
static void
xml_errorHandler(void *ctxt, const char *msg,...)
{
1286 1287
	/* Append the formatted text to xml_err_buf */
	for (;;)
1288
	{
1289 1290 1291 1292 1293 1294 1295
		va_list		args;
		bool		success;

		/* Try to format the data. */
		va_start(args, msg);
		success = appendStringInfoVA(xml_err_buf, msg, args);
		va_end(args);
1296

1297 1298 1299 1300 1301
		if (success)
			break;

		/* Double the buffer size and try again. */
		enlargeStringInfo(xml_err_buf, xml_err_buf->maxlen);
1302 1303 1304 1305 1306
	}
}


/*
1307 1308 1309 1310 1311
 * Wrapper for "ereport" function for XML-related errors.  The "msg"
 * is the SQL-level message; some can be adopted from the SQL/XML
 * standard.  This function uses "code" to create a textual detail
 * message.  At the moment, we only need to cover those codes that we
 * may raise in this file.
1312 1313
 */
static void
1314 1315
xml_ereport_by_code(int level, int sqlcode,
					const char *msg, int code)
1316 1317 1318
{
    const char *det;

1319 1320
    switch (code)
	{
1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338
		case XML_ERR_INVALID_CHAR:
			det = "Invalid character value";
			break;
		case XML_ERR_SPACE_REQUIRED:
			det = "Space required";
			break;
		case XML_ERR_STANDALONE_VALUE:
			det = "standalone accepts only 'yes' or 'no'";
			break;
		case XML_ERR_VERSION_MISSING:
			det = "Malformed declaration expecting version";
			break;
		case XML_ERR_MISSING_ENCODING:
			det = "Missing encoding in text declaration";
			break;
		case XML_ERR_XMLDECL_NOT_FINISHED:
			det = "Parsing XML declaration: '?>' expected";
			break;
1339
        default:
1340 1341
            det = "Unrecognized libxml error code: %d";
			break;
1342
	}
1343

1344 1345 1346 1347
	ereport(level,
			(errcode(sqlcode),
			 errmsg("%s", msg),
			 errdetail(det, code)));
1348 1349 1350 1351
}


/*
1352
 * Convert one char in the current server encoding to a Unicode codepoint.
1353 1354
 */
static pg_wchar
1355
sqlchar_to_unicode(char *s)
1356
{
1357
	char *utf8string;
1358
	pg_wchar ret[2];			/* need space for trailing zero */
1359 1360 1361 1362 1363

	utf8string = (char *) pg_do_encoding_conversion((unsigned char *) s,
													pg_mblen(s),
													GetDatabaseEncoding(),
													PG_UTF8);
1364

1365
	pg_encoding_mb2wchar_with_len(PG_UTF8, utf8string, ret, pg_mblen(s));
1366

1367
	return ret[0];
1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396
}


static bool
is_valid_xml_namefirst(pg_wchar c)
{
	/* (Letter | '_' | ':') */
	return (xmlIsBaseCharQ(c) || xmlIsIdeographicQ(c)
			|| c == '_' || c == ':');
}


static bool
is_valid_xml_namechar(pg_wchar c)
{
	/* Letter | Digit | '.' | '-' | '_' | ':' | CombiningChar | Extender */
	return (xmlIsBaseCharQ(c) || xmlIsIdeographicQ(c)
			|| xmlIsDigitQ(c)
			|| c == '.' || c == '-' || c == '_' || c == ':'
			|| xmlIsCombiningQ(c)
			|| xmlIsExtenderQ(c));
}
#endif /* USE_LIBXML */


/*
 * Map SQL identifier to XML name; see SQL/XML:2003 section 9.1.
 */
char *
1397
map_sql_identifier_to_xml_name(char *ident, bool fully_escaped, bool escape_period)
1398
{
1399 1400 1401 1402
#ifdef USE_LIBXML
	StringInfoData buf;
	char *p;

1403 1404 1405 1406 1407 1408
	/*
	 * SQL/XML doesn't make use of this case anywhere, so it's
	 * probably a mistake.
	 */
	Assert(fully_escaped || !escape_period);

1409 1410 1411 1412 1413 1414 1415 1416
	initStringInfo(&buf);

	for (p = ident; *p; p += pg_mblen(p))
	{
		if (*p == ':' && (p == ident || fully_escaped))
			appendStringInfo(&buf, "_x003A_");
		else if (*p == '_' && *(p+1) == 'x')
			appendStringInfo(&buf, "_x005F_");
1417 1418
		else if (fully_escaped && p == ident &&
				 pg_strncasecmp(p, "xml", 3) == 0)
1419 1420 1421 1422 1423 1424
		{
			if (*p == 'x')
				appendStringInfo(&buf, "_x0078_");
			else
				appendStringInfo(&buf, "_x0058_");
		}
1425 1426
		else if (escape_period && *p == '.')
			appendStringInfo(&buf, "_x002E_");
1427 1428 1429 1430
		else
		{
			pg_wchar u = sqlchar_to_unicode(p);

1431 1432 1433 1434
			if ((p == ident)
				? !is_valid_xml_namefirst(u)
				: !is_valid_xml_namechar(u))
				appendStringInfo(&buf, "_x%04X_", (unsigned int) u);
1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445
			else
				appendBinaryStringInfo(&buf, p, pg_mblen(p));
		}
	}

	return buf.data;
#else /* not USE_LIBXML */
	NO_XML_SUPPORT();
	return NULL;
#endif /* not USE_LIBXML */
}
1446 1447 1448


/*
1449 1450 1451 1452 1453
 * Map a Unicode codepoint into the current server encoding.
 */
static char *
unicode_to_sqlchar(pg_wchar c)
{
1454
	static unsigned char utf8string[5];	/* need trailing zero */
1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487

	if (c <= 0x7F)
	{
		utf8string[0] = c;
	}
	else if (c <= 0x7FF)
	{
		utf8string[0] = 0xC0 | ((c >> 6) & 0x1F);
		utf8string[1] = 0x80 | (c & 0x3F);
	}
	else if (c <= 0xFFFF)
	{
		utf8string[0] = 0xE0 | ((c >> 12) & 0x0F);
		utf8string[1] = 0x80 | ((c >> 6) & 0x3F);
		utf8string[2] = 0x80 | (c & 0x3F);
	}
	else
	{
		utf8string[0] = 0xF0 | ((c >> 18) & 0x07);
		utf8string[1] = 0x80 | ((c >> 12) & 0x3F);
		utf8string[2] = 0x80 | ((c >> 6) & 0x3F);
		utf8string[3] = 0x80 | (c & 0x3F);
	}

	return (char *) pg_do_encoding_conversion(utf8string,
											  pg_mblen((char *) utf8string),
											  PG_UTF8,
											  GetDatabaseEncoding());
}


/*
 * Map XML name to SQL identifier; see SQL/XML:2003 section 9.17.
1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517
 */
char *
map_xml_name_to_sql_identifier(char *name)
{
	StringInfoData buf;
	char *p;

	initStringInfo(&buf);

	for (p = name; *p; p += pg_mblen(p))
	{
		if (*p == '_' && *(p+1) == 'x'
			&& isxdigit((unsigned char) *(p+2))
			&& isxdigit((unsigned char) *(p+3))
			&& isxdigit((unsigned char) *(p+4))
			&& isxdigit((unsigned char) *(p+5))
			&& *(p+6) == '_')
		{
			unsigned int u;

			sscanf(p + 2, "%X", &u);
			appendStringInfoString(&buf, unicode_to_sqlchar(u));
			p += 6;
		}
		else
			appendBinaryStringInfo(&buf, p, pg_mblen(p));
	}

	return buf.data;
}
1518 1519 1520 1521

/*
 * Map SQL value to XML value; see SQL/XML:2003 section 9.16.
 */
1522
char *
1523 1524 1525 1526 1527 1528
map_sql_value_to_xml_value(Datum value, Oid type)
{
	StringInfoData buf;

	initStringInfo(&buf);

1529
	if (type_is_array(type))
1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567
	{
		int i;
		ArrayType *array;
		Oid elmtype;
		int16 elmlen;
		bool elmbyval;
		char elmalign;

		array = DatumGetArrayTypeP(value);

		/* TODO: need some code-fu here to remove this limitation */
		if (ARR_NDIM(array) != 1)
			ereport(ERROR,
					(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
					 errmsg("only supported for one-dimensional array")));

		elmtype = ARR_ELEMTYPE(array);
		get_typlenbyvalalign(elmtype, &elmlen, &elmbyval, &elmalign);

		for (i = ARR_LBOUND(array)[0];
			 i < ARR_LBOUND(array)[0] + ARR_DIMS(array)[0];
			 i++)
		{
			Datum subval;
			bool isnull;

			subval = array_ref(array, 1, &i, -1, elmlen, elmbyval, elmalign, &isnull);
			appendStringInfoString(&buf, "<element>");
			appendStringInfoString(&buf, map_sql_value_to_xml_value(subval, elmtype));
			appendStringInfoString(&buf, "</element>");
		}
	}
	else
	{
		Oid typeOut;
		bool isvarlena;
		char *p, *str;

1568 1569 1570 1571
		/*
		 * Special XSD formatting for some data types
		 */
		switch (type)
1572
		{
1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642
			case BOOLOID:
				if (DatumGetBool(value))
					return "true";
				else
					return "false";

			case DATEOID:
			{
				DateADT		date;
				struct pg_tm tm;
				char		buf[MAXDATELEN + 1];

				date = DatumGetDateADT(value);
				j2date(date + POSTGRES_EPOCH_JDATE,
					   &(tm.tm_year), &(tm.tm_mon), &(tm.tm_mday));
				EncodeDateOnly(&tm, USE_XSD_DATES, buf);

				return pstrdup(buf);
			}

			case TIMESTAMPOID:
			{
				Timestamp	timestamp;
				struct pg_tm tm;
				fsec_t		fsec;
				char	   *tzn = NULL;
				char		buf[MAXDATELEN + 1];

				timestamp = DatumGetTimestamp(value);

				/* XSD doesn't support infinite values */
				if (TIMESTAMP_NOT_FINITE(timestamp))
					ereport(ERROR,
							(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
							 errmsg("timestamp out of range")));
				else if (timestamp2tm(timestamp, NULL, &tm, &fsec, NULL, NULL) == 0)
					EncodeDateTime(&tm, fsec, NULL, &tzn, USE_XSD_DATES, buf);
				else
					ereport(ERROR,
							(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
							 errmsg("timestamp out of range")));

				return pstrdup(buf);
			}

			case TIMESTAMPTZOID:
			{
				TimestampTz	timestamp;
				struct pg_tm tm;
				int			tz;
				fsec_t		fsec;
				char	   *tzn = NULL;
				char		buf[MAXDATELEN + 1];

				timestamp = DatumGetTimestamp(value);

				/* XSD doesn't support infinite values */
				if (TIMESTAMP_NOT_FINITE(timestamp))
					ereport(ERROR,
							(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
							 errmsg("timestamp out of range")));
				else if (timestamp2tm(timestamp, &tz, &tm, &fsec, &tzn, NULL) == 0)
					EncodeDateTime(&tm, fsec, &tz, &tzn, USE_XSD_DATES, buf);
				else
					ereport(ERROR,
							(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
							 errmsg("timestamp out of range")));

				return pstrdup(buf);
			}
1643 1644
		}

1645 1646 1647 1648 1649 1650
		getTypeOutputInfo(type, &typeOut, &isvarlena);
		str = OidOutputFunctionCall(typeOut, value);

		if (type == XMLOID)
			return str;

1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672
#ifdef USE_LIBXML
		if (type == BYTEAOID)
		{
			xmlBufferPtr buf;
			xmlTextWriterPtr writer;
			char *result;

			buf = xmlBufferCreate();
			writer = xmlNewTextWriterMemory(buf, 0);

			if (xmlbinary == XMLBINARY_BASE64)
				xmlTextWriterWriteBase64(writer, VARDATA(value), 0, VARSIZE(value) - VARHDRSZ);
			else
				xmlTextWriterWriteBinHex(writer, VARDATA(value), 0, VARSIZE(value) - VARHDRSZ);

			xmlFreeTextWriter(writer);
			result = pstrdup((const char *) xmlBufferContent(buf));
			xmlBufferFree(buf);
			return result;
		}
#endif /* USE_LIBXML */

1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697
		for (p = str; *p; p += pg_mblen(p))
		{
			switch (*p)
			{
				case '&':
					appendStringInfo(&buf, "&amp;");
					break;
				case '<':
					appendStringInfo(&buf, "&lt;");
					break;
				case '>':
					appendStringInfo(&buf, "&gt;");
					break;
				case '\r':
					appendStringInfo(&buf, "&#x0d;");
					break;
				default:
					appendBinaryStringInfo(&buf, p, pg_mblen(p));
					break;
			}
		}
	}

	return buf.data;
}
1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708


static char *
_SPI_strdup(const char *s)
{
	char *ret = SPI_palloc(strlen(s) + 1);
	strcpy(ret, s);
	return ret;
}


1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812
/*
 * SQL to XML mapping functions
 *
 * What follows below is intentionally organized so that you can read
 * along in the SQL/XML:2003 standard.  The functions are mostly split
 * up and ordered they way the clauses lay out in the standards
 * document, and the identifiers are also aligned with the standard
 * text.  (SQL/XML:2006 appears to be ordered differently,
 * unfortunately.)
 *
 * There are many things going on there:
 *
 * There are two kinds of mappings: Mapping SQL data (table contents)
 * to XML documents, and mapping SQL structure (the "schema") to XML
 * Schema.  And there are functions that do both at the same time.
 *
 * Then you can map a database, a schema, or a table, each in both
 * ways.  This breaks down recursively: Mapping a database invokes
 * mapping schemas, which invokes mapping tables, which invokes
 * mapping rows, which invokes mapping columns, although you can't
 * call the last two from the outside.  Because of this, there are a
 * number of xyz_internal() functions which are to be called both from
 * the function manager wrapper and from some upper layer in a
 * recursive call.
 *
 * See the documentation about what the common function arguments
 * nulls, tableforest, and targetns mean.
 *
 * Some style guidelines for XML output: Use double quotes for quoting
 * XML attributes.  Indent XML elements by two spaces, but remember
 * that a lot of code is called recursively at different levels, so
 * it's better not to indent rather than create output that indents
 * and outdents weirdly.  Add newlines to make the output look nice.
 */


/*
 * Visibility of objects for XML mappings; see SQL/XML:2003 section
 * 4.8.5.
 */

/*
 * Given a query, which must return type oid as first column, produce
 * a list of Oids with the query results.
 */
static List *
query_to_oid_list(const char *query)
{
	int			i;
	List	   *list = NIL;

	SPI_execute(query, true, 0);

	for (i = 0; i < SPI_processed; i++)
	{
		Oid oid;
		bool isnull;

		oid = DatumGetObjectId(SPI_getbinval(SPI_tuptable->vals[i], SPI_tuptable->tupdesc, 1, &isnull));
		if (isnull)
			continue;
		list = lappend_oid(list, oid);
	}

	return list;
}


static List *
schema_get_xml_visible_tables(Oid nspid)
{
	StringInfoData query;

	initStringInfo(&query);
	appendStringInfo(&query, "SELECT oid FROM pg_class WHERE relnamespace = %u AND relkind IN ('r', 'v') AND has_table_privilege (oid, 'SELECT') ORDER BY relname;", nspid);

	return query_to_oid_list(query.data);
}


/* 
 * Including the system schemas is probably not useful for a database
 * mapping.
 */
#define XML_VISIBLE_SCHEMAS_EXCLUDE "nspname LIKE 'pg_%' ESCAPE '' OR nspname = 'information_schema'"

#define XML_VISIBLE_SCHEMAS "SELECT oid FROM pg_namespace WHERE has_schema_privilege (oid, 'USAGE') AND NOT (" XML_VISIBLE_SCHEMAS_EXCLUDE ")"


static List *
database_get_xml_visible_schemas(void)
{
	return query_to_oid_list(XML_VISIBLE_SCHEMAS " ORDER BY nspname;");
}


static List *
database_get_xml_visible_tables(void)
{
	/* At the moment there is no order required here. */
	return query_to_oid_list("SELECT oid FROM pg_class WHERE relkind IN ('r', 'v') AND has_table_privilege (pg_class.oid, 'SELECT') AND relnamespace IN (" XML_VISIBLE_SCHEMAS ");");
}


1813 1814 1815 1816 1817
/*
 * Map SQL table to XML and/or XML Schema document; see SQL/XML:2003
 * section 9.3.
 */

1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828
static StringInfo
table_to_xml_internal(Oid relid, bool nulls, bool tableforest, const char *targetns, bool top_level)
{
	StringInfoData query;

	initStringInfo(&query);
	appendStringInfo(&query, "SELECT * FROM %s", DatumGetCString(DirectFunctionCall1(regclassout, ObjectIdGetDatum(relid))));
	return query_to_xml_internal(query.data, get_rel_name(relid), NULL, nulls, tableforest, targetns, top_level);
}


1829 1830 1831 1832 1833 1834 1835 1836
Datum
table_to_xml(PG_FUNCTION_ARGS)
{
	Oid			relid = PG_GETARG_OID(0);
	bool		nulls = PG_GETARG_BOOL(1);
	bool		tableforest = PG_GETARG_BOOL(2);
	const char *targetns = _textout(PG_GETARG_TEXT_P(3));

1837
	PG_RETURN_XML_P(stringinfo_to_xmltype(table_to_xml_internal(relid, nulls, tableforest, targetns, true)));
1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848
}


Datum
query_to_xml(PG_FUNCTION_ARGS)
{
	char	   *query = _textout(PG_GETARG_TEXT_P(0));
	bool		nulls = PG_GETARG_BOOL(1);
	bool		tableforest = PG_GETARG_BOOL(2);
	const char *targetns = _textout(PG_GETARG_TEXT_P(3));

1849
	PG_RETURN_XML_P(stringinfo_to_xmltype(query_to_xml_internal(query, NULL, NULL, nulls, tableforest, targetns, true)));
1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876
}


Datum
cursor_to_xml(PG_FUNCTION_ARGS)
{
	char	   *name = _textout(PG_GETARG_TEXT_P(0));
	int32		count = PG_GETARG_INT32(1);
	bool		nulls = PG_GETARG_BOOL(2);
	bool		tableforest = PG_GETARG_BOOL(3);
	const char *targetns = _textout(PG_GETARG_TEXT_P(4));

	StringInfoData result;
	Portal		portal;
	int			i;

	initStringInfo(&result);

	SPI_connect();
	portal = SPI_cursor_find(name);
	if (portal == NULL)
		ereport(ERROR,
				(errcode(ERRCODE_UNDEFINED_CURSOR),
				 errmsg("cursor \"%s\" does not exist", name)));

	SPI_cursor_fetch(portal, true, count);
	for (i = 0; i < SPI_processed; i++)
1877
		SPI_sql_row_to_xmlelement(i, &result, NULL, nulls, tableforest, targetns, true);
1878 1879 1880 1881 1882 1883 1884

	SPI_finish();

	PG_RETURN_XML_P(stringinfo_to_xmltype(&result));
}


1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928
/*
 * Write the start tag of the root element of a data mapping.
 *
 * top_level means that this is the very top level of the eventual
 * output.  For example, when the user calls table_to_xml, then a call
 * with a table name to this function is the top level.  When the user
 * calls database_to_xml, then a call with a schema name to this
 * function is not the top level.  If top_level is false, then the XML
 * namespace declarations are omitted, because they supposedly already
 * appeared earlier in the output.  Repeating them is not wrong, but
 * it looks ugly.
*/
static void
xmldata_root_element_start(StringInfo result, const char *eltname, const char *xmlschema, const char *targetns, bool top_level)
{
	/* This isn't really wrong but currently makes no sense. */
	Assert(top_level || !xmlschema);

	appendStringInfo(result, "<%s", eltname);
	if (top_level)
	{
		appendStringInfoString(result, " xmlns:xsi=\"" NAMESPACE_XSI "\"");
		if (strlen(targetns) > 0)
			appendStringInfo(result, " xmlns=\"%s\"", targetns);
	}
	if (xmlschema)
	{
		/* FIXME: better targets */
		if (strlen(targetns) > 0)
			appendStringInfo(result, " xsi:schemaLocation=\"%s #\"", targetns);
		else
			appendStringInfo(result, " xsi:noNamespaceSchemaLocation=\"#\"");
	}
	appendStringInfo(result, ">\n\n");
}


static void
xmldata_root_element_end(StringInfo result, const char *eltname)
{
	appendStringInfo(result, "</%s>\n", eltname);
}


1929
static StringInfo
1930
query_to_xml_internal(const char *query, char *tablename, const char *xmlschema, bool nulls, bool tableforest, const char *targetns, bool top_level)
1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949
{
	StringInfo	result;
	char	   *xmltn;
	int			i;

	if (tablename)
		xmltn = map_sql_identifier_to_xml_name(tablename, true, false);
	else
		xmltn = "table";

	result = makeStringInfo();

	SPI_connect();
	if (SPI_execute(query, true, 0) != SPI_OK_SELECT)
		ereport(ERROR,
				(errcode(ERRCODE_DATA_EXCEPTION),
				 errmsg("invalid query")));

	if (!tableforest)
1950
		xmldata_root_element_start(result, xmltn, xmlschema, targetns, top_level);
1951 1952 1953 1954 1955

	if (xmlschema)
		appendStringInfo(result, "%s\n\n", xmlschema);

	for(i = 0; i < SPI_processed; i++)
1956
		SPI_sql_row_to_xmlelement(i, result, tablename, nulls, tableforest, targetns, top_level);
1957 1958

	if (!tableforest)
1959
		xmldata_root_element_end(result, xmltn);
1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994

	SPI_finish();

	return result;
}


Datum
table_to_xmlschema(PG_FUNCTION_ARGS)
{
	Oid			relid = PG_GETARG_OID(0);
	bool		nulls = PG_GETARG_BOOL(1);
	bool		tableforest = PG_GETARG_BOOL(2);
	const char *targetns = _textout(PG_GETARG_TEXT_P(3));

	const char *result;
	Relation rel;

	rel = heap_open(relid, AccessShareLock);
	result = map_sql_table_to_xmlschema(rel->rd_att, relid, nulls, tableforest, targetns);
	heap_close(rel, NoLock);

	PG_RETURN_XML_P(cstring_to_xmltype(result));
}


Datum
query_to_xmlschema(PG_FUNCTION_ARGS)
{
	char	   *query = _textout(PG_GETARG_TEXT_P(0));
	bool		nulls = PG_GETARG_BOOL(1);
	bool		tableforest = PG_GETARG_BOOL(2);
	const char *targetns = _textout(PG_GETARG_TEXT_P(3));

	const char *result;
1995
	SPIPlanPtr	plan;
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052
	Portal		portal;

	SPI_connect();
	plan = SPI_prepare(query, 0, NULL);
	portal = SPI_cursor_open(NULL, plan, NULL, NULL, true);
	result = _SPI_strdup(map_sql_table_to_xmlschema(portal->tupDesc, InvalidOid, nulls, tableforest, targetns));
	SPI_cursor_close(portal);
	SPI_finish();

	PG_RETURN_XML_P(cstring_to_xmltype(result));
}


Datum
cursor_to_xmlschema(PG_FUNCTION_ARGS)
{
	char	   *name = _textout(PG_GETARG_TEXT_P(0));
	bool		nulls = PG_GETARG_BOOL(1);
	bool		tableforest = PG_GETARG_BOOL(2);
	const char *targetns = _textout(PG_GETARG_TEXT_P(3));

	const char *xmlschema;
	Portal		portal;

	SPI_connect();
	portal = SPI_cursor_find(name);
	if (portal == NULL)
		ereport(ERROR,
				(errcode(ERRCODE_UNDEFINED_CURSOR),
				 errmsg("cursor \"%s\" does not exist", name)));

	xmlschema = _SPI_strdup(map_sql_table_to_xmlschema(portal->tupDesc, InvalidOid, nulls, tableforest, targetns));
	SPI_finish();

	PG_RETURN_XML_P(cstring_to_xmltype(xmlschema));
}


Datum
table_to_xml_and_xmlschema(PG_FUNCTION_ARGS)
{
	Oid			relid = PG_GETARG_OID(0);
	bool		nulls = PG_GETARG_BOOL(1);
	bool		tableforest = PG_GETARG_BOOL(2);
	const char *targetns = _textout(PG_GETARG_TEXT_P(3));

	StringInfoData query;
	Relation	rel;
	const char *xmlschema;

	rel = heap_open(relid, AccessShareLock);
	xmlschema = map_sql_table_to_xmlschema(rel->rd_att, relid, nulls, tableforest, targetns);
	heap_close(rel, NoLock);

	initStringInfo(&query);
	appendStringInfo(&query, "SELECT * FROM %s", DatumGetCString(DirectFunctionCall1(regclassout, ObjectIdGetDatum(relid))));

2053
	PG_RETURN_XML_P(stringinfo_to_xmltype(query_to_xml_internal(query.data, get_rel_name(relid), xmlschema, nulls, tableforest, targetns, true)));
2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065
}


Datum
query_to_xml_and_xmlschema(PG_FUNCTION_ARGS)
{
	char	   *query = _textout(PG_GETARG_TEXT_P(0));
	bool		nulls = PG_GETARG_BOOL(1);
	bool		tableforest = PG_GETARG_BOOL(2);
	const char *targetns = _textout(PG_GETARG_TEXT_P(3));

	const char *xmlschema;
2066
	SPIPlanPtr	plan;
2067 2068 2069 2070 2071 2072 2073 2074 2075
	Portal		portal;

	SPI_connect();
	plan = SPI_prepare(query, 0, NULL);
	portal = SPI_cursor_open(NULL, plan, NULL, NULL, true);
	xmlschema = _SPI_strdup(map_sql_table_to_xmlschema(portal->tupDesc, InvalidOid, nulls, tableforest, targetns));
	SPI_cursor_close(portal);
	SPI_finish();

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	PG_RETURN_XML_P(stringinfo_to_xmltype(query_to_xml_internal(query, NULL, xmlschema, nulls, tableforest, targetns, true)));
}


/*
 * Map SQL schema to XML and/or XML Schema document; see SQL/XML:2003
 * section 9.4.
 */

static StringInfo
schema_to_xml_internal(Oid nspid, const char *xmlschema, bool nulls, bool tableforest, const char *targetns, bool top_level)
{
	StringInfo	result;
	char	   *xmlsn;
	List	   *relid_list;
	ListCell   *cell;

	xmlsn = map_sql_identifier_to_xml_name(get_namespace_name(nspid), true, false);
	result = makeStringInfo();

	xmldata_root_element_start(result, xmlsn, xmlschema, targetns, top_level);

	if (xmlschema)
		appendStringInfo(result, "%s\n\n", xmlschema);

	SPI_connect();

	relid_list = schema_get_xml_visible_tables(nspid);

	SPI_push();

	foreach(cell, relid_list)
	{
		Oid relid = lfirst_oid(cell);
		StringInfo subres;

		subres = table_to_xml_internal(relid, nulls, tableforest, targetns, false);

		appendStringInfoString(result, subres->data);
		appendStringInfoChar(result, '\n');
	}

	SPI_pop();
	SPI_finish();

	xmldata_root_element_end(result, xmlsn);

	return result;
}


Datum
schema_to_xml(PG_FUNCTION_ARGS)
{
	Name		name = PG_GETARG_NAME(0);
	bool		nulls = PG_GETARG_BOOL(1);
	bool		tableforest = PG_GETARG_BOOL(2);
	const char *targetns = _textout(PG_GETARG_TEXT_P(3));

	char	   *schemaname;
	Oid			nspid;

	schemaname = NameStr(*name);
	nspid = LookupExplicitNamespace(schemaname);

	PG_RETURN_XML_P(stringinfo_to_xmltype(schema_to_xml_internal(nspid, NULL, nulls, tableforest, targetns, true)));
}


/*
 * Write the start element of the root element of an XML Schema mapping.
 */
static void
xsd_schema_element_start(StringInfo result, const char *targetns)
{
	appendStringInfoString(result,
						   "<xsd:schema\n"
						   "    xmlns:xsd=\"" NAMESPACE_XSD "\"");
	if (strlen(targetns) > 0)
		appendStringInfo(result,
						 "\n"
						 "    targetNamespace=\"%s\"\n"
						 "    elementFormDefault=\"qualified\"",
						 targetns);
	appendStringInfoString(result,
						   ">\n\n");
}


static void
xsd_schema_element_end(StringInfo result)
{
	appendStringInfoString(result,
						   "</xsd:schema>");
}


static StringInfo
schema_to_xmlschema_internal(const char *schemaname, bool nulls, bool tableforest, const char *targetns)
{
	Oid			nspid;
	List	   *relid_list;
	List	   *tupdesc_list;
	ListCell   *cell;
	StringInfo	result;

	result = makeStringInfo();

	nspid = LookupExplicitNamespace(schemaname);

	xsd_schema_element_start(result, targetns);

	SPI_connect();

	relid_list = schema_get_xml_visible_tables(nspid);

	tupdesc_list = NIL;
	foreach (cell, relid_list)
	{
		Relation rel;

		rel = heap_open(lfirst_oid(cell), AccessShareLock);
		tupdesc_list = lappend(tupdesc_list, rel->rd_att);
		heap_close(rel, NoLock);
	}

	appendStringInfoString(result,
						   map_sql_typecoll_to_xmlschema_types(tupdesc_list));

	appendStringInfoString(result,
						   map_sql_schema_to_xmlschema_types(nspid, relid_list, nulls, tableforest, targetns));

	xsd_schema_element_end(result);

	SPI_finish();

	return result;
}


Datum
schema_to_xmlschema(PG_FUNCTION_ARGS)
{
	Name		name = PG_GETARG_NAME(0);
	bool		nulls = PG_GETARG_BOOL(1);
	bool		tableforest = PG_GETARG_BOOL(2);
	const char *targetns = _textout(PG_GETARG_TEXT_P(3));

	PG_RETURN_XML_P(stringinfo_to_xmltype(schema_to_xmlschema_internal(NameStr(*name), nulls, tableforest, targetns)));
}


Datum
schema_to_xml_and_xmlschema(PG_FUNCTION_ARGS)
{
	Name		name = PG_GETARG_NAME(0);
	bool		nulls = PG_GETARG_BOOL(1);
	bool		tableforest = PG_GETARG_BOOL(2);
	const char *targetns = _textout(PG_GETARG_TEXT_P(3));

	char	   *schemaname;
	Oid			nspid;
	StringInfo	xmlschema;

	schemaname = NameStr(*name);
	nspid = LookupExplicitNamespace(schemaname);

	xmlschema = schema_to_xmlschema_internal(schemaname, nulls, tableforest, targetns);

	PG_RETURN_XML_P(stringinfo_to_xmltype(schema_to_xml_internal(nspid, xmlschema->data, nulls, tableforest, targetns, true)));
}


/*
 * Map SQL database to XML and/or XML Schema document; see SQL/XML:2003
 * section 9.5.
 */

static StringInfo
database_to_xml_internal(const char *xmlschema, bool nulls, bool tableforest, const char *targetns)
{
	StringInfo	result;
	List	   *nspid_list;
	ListCell   *cell;
	char	   *xmlcn;

	xmlcn = map_sql_identifier_to_xml_name(get_database_name(MyDatabaseId), true, false);
	result = makeStringInfo();

	xmldata_root_element_start(result, xmlcn, xmlschema, targetns, true);

	if (xmlschema)
		appendStringInfo(result, "%s\n\n", xmlschema);

	SPI_connect();

	nspid_list = database_get_xml_visible_schemas();

	SPI_push();

	foreach(cell, nspid_list)
	{
		Oid nspid = lfirst_oid(cell);
		StringInfo subres;

		subres = schema_to_xml_internal(nspid, NULL, nulls, tableforest, targetns, false);

		appendStringInfoString(result, subres->data);
		appendStringInfoChar(result, '\n');
	}

	SPI_pop();
	SPI_finish();

	xmldata_root_element_end(result, xmlcn);

	return result;
}


Datum
database_to_xml(PG_FUNCTION_ARGS)
{
	bool		nulls = PG_GETARG_BOOL(0);
	bool		tableforest = PG_GETARG_BOOL(1);
	const char *targetns = _textout(PG_GETARG_TEXT_P(2));

	PG_RETURN_XML_P(stringinfo_to_xmltype(database_to_xml_internal(NULL, nulls, tableforest, targetns)));
}


static StringInfo
database_to_xmlschema_internal(bool nulls, bool tableforest, const char *targetns)
{
	List	   *relid_list;
	List	   *nspid_list;
	List	   *tupdesc_list;
	ListCell   *cell;
	StringInfo	result;

	result = makeStringInfo();

	xsd_schema_element_start(result, targetns);

	SPI_connect();

	relid_list = database_get_xml_visible_tables();
	nspid_list = database_get_xml_visible_schemas();

	tupdesc_list = NIL;
	foreach (cell, relid_list)
	{
		Relation rel;

		rel = heap_open(lfirst_oid(cell), AccessShareLock);
		tupdesc_list = lappend(tupdesc_list, rel->rd_att);
		heap_close(rel, NoLock);
	}

	appendStringInfoString(result,
						   map_sql_typecoll_to_xmlschema_types(tupdesc_list));

	appendStringInfoString(result,
						   map_sql_catalog_to_xmlschema_types(nspid_list, nulls, tableforest, targetns));

	xsd_schema_element_end(result);

	SPI_finish();

	return result;
}


Datum
database_to_xmlschema(PG_FUNCTION_ARGS)
{
	bool		nulls = PG_GETARG_BOOL(0);
	bool		tableforest = PG_GETARG_BOOL(1);
	const char *targetns = _textout(PG_GETARG_TEXT_P(2));

	PG_RETURN_XML_P(stringinfo_to_xmltype(database_to_xmlschema_internal(nulls, tableforest, targetns)));
}


Datum
database_to_xml_and_xmlschema(PG_FUNCTION_ARGS)
{
	bool		nulls = PG_GETARG_BOOL(0);
	bool		tableforest = PG_GETARG_BOOL(1);
	const char *targetns = _textout(PG_GETARG_TEXT_P(2));

	StringInfo	xmlschema;

	xmlschema = database_to_xmlschema_internal(nulls, tableforest, targetns);

	PG_RETURN_XML_P(stringinfo_to_xmltype(database_to_xml_internal(xmlschema->data, nulls, tableforest, targetns)));
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}


/*
 * Map a multi-part SQL name to an XML name; see SQL/XML:2003 section
 * 9.2.
 */
static char *
map_multipart_sql_identifier_to_xml_name(char *a, char *b, char *c, char *d)
{
	StringInfoData result;

	initStringInfo(&result);

	if (a)
		appendStringInfo(&result, "%s", map_sql_identifier_to_xml_name(a, true, true));
	if (b)
		appendStringInfo(&result, ".%s", map_sql_identifier_to_xml_name(b, true, true));
	if (c)
		appendStringInfo(&result, ".%s", map_sql_identifier_to_xml_name(c, true, true));
	if (d)
		appendStringInfo(&result, ".%s", map_sql_identifier_to_xml_name(d, true, true));

	return result.data;
}


/*
 * Map an SQL table to an XML Schema document; see SQL/XML:2003
 * section 9.3.
 *
 * Map an SQL table to XML Schema data types; see SQL/XML:2003 section
 * 9.6.
 */
static const char *
map_sql_table_to_xmlschema(TupleDesc tupdesc, Oid relid, bool nulls, bool tableforest, const char *targetns)
{
	int			i;
	char	   *xmltn;
	char	   *tabletypename;
	char	   *rowtypename;
	StringInfoData result;

	initStringInfo(&result);

	if (relid)
	{
		HeapTuple tuple = SearchSysCache(RELOID, ObjectIdGetDatum(relid), 0, 0, 0);
		Form_pg_class reltuple = (Form_pg_class) GETSTRUCT(tuple);

		xmltn = map_sql_identifier_to_xml_name(NameStr(reltuple->relname), true, false);

		tabletypename = map_multipart_sql_identifier_to_xml_name("TableType",
																 get_database_name(MyDatabaseId),
																 get_namespace_name(reltuple->relnamespace),
																 NameStr(reltuple->relname));

		rowtypename = map_multipart_sql_identifier_to_xml_name("RowType",
															   get_database_name(MyDatabaseId),
															   get_namespace_name(reltuple->relnamespace),
															   NameStr(reltuple->relname));

		ReleaseSysCache(tuple);
	}
	else
	{
		if (tableforest)
			xmltn = "row";
		else
			xmltn = "table";

		tabletypename = "TableType";
		rowtypename = "RowType";
	}

2447
	xsd_schema_element_start(&result, targetns);
2448 2449

	appendStringInfoString(&result,
2450
						   map_sql_typecoll_to_xmlschema_types(list_make1(tupdesc)));
2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486

	appendStringInfo(&result,
					 "<xsd:complexType name=\"%s\">\n"
					 "  <xsd:sequence>\n",
					 rowtypename);

	for (i = 0; i < tupdesc->natts; i++)
		appendStringInfo(&result,
						 "    <xsd:element name=\"%s\" type=\"%s\"%s></xsd:element>\n",
						 map_sql_identifier_to_xml_name(NameStr(tupdesc->attrs[i]->attname), true, false),
						 map_sql_type_to_xml_name(tupdesc->attrs[i]->atttypid, -1),
						 nulls ? " nillable=\"true\"" : " minOccurs=\"0\"");

	appendStringInfoString(&result,
						   "  </xsd:sequence>\n"
						   "</xsd:complexType>\n\n");

	if (!tableforest)
	{
		appendStringInfo(&result,
						 "<xsd:complexType name=\"%s\">\n"
						 "  <xsd:sequence>\n"
						 "    <xsd:element name=\"row\" type=\"%s\" minOccurs=\"0\" maxOccurs=\"unbounded\"/>\n"
						 "  </xsd:sequence>\n"
						 "</xsd:complexType>\n\n",
						 tabletypename, rowtypename);

		appendStringInfo(&result,
						 "<xsd:element name=\"%s\" type=\"%s\"/>\n\n",
						 xmltn, tabletypename);
	}
	else
		appendStringInfo(&result,
						 "<xsd:element name=\"%s\" type=\"%s\"/>\n\n",
						 xmltn, rowtypename);

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	xsd_schema_element_end(&result);

	return result.data;
}


/*
 * Map an SQL schema to XML Schema data types; see SQL/XML section
 * 9.7.
 */
static const char *
map_sql_schema_to_xmlschema_types(Oid nspid, List *relid_list, bool nulls, bool tableforest, const char *targetns)
{
	char	   *xmlsn;
	char	   *schematypename;
	StringInfoData result;
	ListCell   *cell;

	initStringInfo(&result);

	xmlsn = map_sql_identifier_to_xml_name(get_namespace_name(nspid), true, false);

	schematypename = map_multipart_sql_identifier_to_xml_name("SchemaType",
															  get_database_name(MyDatabaseId),
															  get_namespace_name(nspid),
															  NULL);

	appendStringInfo(&result,
					 "<xsd:complexType name=\"%s\">\n", schematypename);
	if (!tableforest)
		appendStringInfoString(&result,
							   "  <xsd:all>\n");
	else
		appendStringInfoString(&result,
							   "  <xsd:sequence>\n");

	foreach (cell, relid_list)
	{
		Oid relid = lfirst_oid(cell);
		char *xmltn = map_sql_identifier_to_xml_name(get_rel_name(relid), true, false);
		char *tabletypename = map_multipart_sql_identifier_to_xml_name(tableforest ? "RowType" : "TableType",
																	   get_database_name(MyDatabaseId),
																	   get_namespace_name(nspid),
																	   get_rel_name(relid));

		if (!tableforest)
			appendStringInfo(&result,
							 "    <xsd:element name=\"%s\" type=\"%s\" />\n",
							 xmltn, tabletypename);
		else
			appendStringInfo(&result,
							 "    <xsd:element name=\"%s\" type=\"%s\" minOccurs=\"0\" maxOccurs=\"unbounded\" />\n",
							 xmltn, tabletypename);
	}

	if (!tableforest)
		appendStringInfoString(&result,
							   "  </xsd:all>\n");
	else
		appendStringInfoString(&result,
							   "  </xsd:sequence>\n");
2548
	appendStringInfoString(&result,
2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606
						   "</xsd:complexType>\n\n");

	appendStringInfo(&result,
					 "<xsd:element name=\"%s\" type=\"%s\"/>\n\n",
					 xmlsn, schematypename);

	return result.data;
}


/*
 * Map an SQL catalog to XML Schema data types; see SQL/XML section
 * 9.8.
 */
static const char *
map_sql_catalog_to_xmlschema_types(List *nspid_list, bool nulls, bool tableforest, const char *targetns)
{
	char	   *xmlcn;
	char	   *catalogtypename;
	StringInfoData result;
	ListCell   *cell;

	initStringInfo(&result);

	xmlcn = map_sql_identifier_to_xml_name(get_database_name(MyDatabaseId), true, false);

	catalogtypename = map_multipart_sql_identifier_to_xml_name("CatalogType",
															   get_database_name(MyDatabaseId),
															   NULL,
															   NULL);

	appendStringInfo(&result,
					 "<xsd:complexType name=\"%s\">\n", catalogtypename);
	appendStringInfoString(&result,
						   "  <xsd:all>\n");

	foreach (cell, nspid_list)
	{
		Oid nspid = lfirst_oid(cell);
		char *xmlsn = map_sql_identifier_to_xml_name(get_namespace_name(nspid), true, false);
		char *schematypename = map_multipart_sql_identifier_to_xml_name("SchemaType",
																		get_database_name(MyDatabaseId),
																		get_namespace_name(nspid),
																		NULL);

		appendStringInfo(&result,
						 "    <xsd:element name=\"%s\" type=\"%s\" />\n",
						 xmlsn, schematypename);
	}

	appendStringInfoString(&result,
						   "  </xsd:all>\n");
	appendStringInfoString(&result,
						   "</xsd:complexType>\n\n");

	appendStringInfo(&result,
					 "<xsd:element name=\"%s\" type=\"%s\"/>\n\n",
					 xmlcn, catalogtypename);
2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697

	return result.data;
}


/*
 * Map an SQL data type to an XML name; see SQL/XML:2003 section 9.9.
 */
static const char *
map_sql_type_to_xml_name(Oid typeoid, int typmod)
{
	StringInfoData result;

	initStringInfo(&result);

	switch(typeoid)
	{
		case BPCHAROID:
			if (typmod == -1)
				appendStringInfo(&result, "CHAR");
			else
				appendStringInfo(&result, "CHAR_%d", typmod - VARHDRSZ);
			break;
		case VARCHAROID:
			if (typmod == -1)
				appendStringInfo(&result, "VARCHAR");
			else
				appendStringInfo(&result, "VARCHAR_%d", typmod - VARHDRSZ);
			break;
		case NUMERICOID:
			if (typmod == -1)
				appendStringInfo(&result, "NUMERIC");
			else
				appendStringInfo(&result, "NUMERIC_%d_%d",
								 ((typmod - VARHDRSZ) >> 16) & 0xffff,
								 (typmod - VARHDRSZ) & 0xffff);
			break;
		case INT4OID:
			appendStringInfo(&result, "INTEGER");
			break;
		case INT2OID:
			appendStringInfo(&result, "SMALLINT");
			break;
		case INT8OID:
			appendStringInfo(&result, "BIGINT");
			break;
		case FLOAT4OID:
			appendStringInfo(&result, "REAL");
			break;
		case FLOAT8OID:
			appendStringInfo(&result, "DOUBLE");
			break;
		case BOOLOID:
			appendStringInfo(&result, "BOOLEAN");
			break;
		case TIMEOID:
			if (typmod == -1)
				appendStringInfo(&result, "TIME");
			else
				appendStringInfo(&result, "TIME_%d", typmod);
			break;
		case TIMETZOID:
			if (typmod == -1)
				appendStringInfo(&result, "TIME_WTZ");
			else
				appendStringInfo(&result, "TIME_WTZ_%d", typmod);
			break;
		case TIMESTAMPOID:
			if (typmod == -1)
				appendStringInfo(&result, "TIMESTAMP");
			else
				appendStringInfo(&result, "TIMESTAMP_%d", typmod);
			break;
		case TIMESTAMPTZOID:
			if (typmod == -1)
				appendStringInfo(&result, "TIMESTAMP_WTZ");
			else
				appendStringInfo(&result, "TIMESTAMP_WTZ_%d", typmod);
			break;
		case DATEOID:
			appendStringInfo(&result, "DATE");
			break;
		case XMLOID:
			appendStringInfo(&result, "XML");
			break;
		default:
		{
			HeapTuple tuple = SearchSysCache(TYPEOID, ObjectIdGetDatum(typeoid), 0, 0, 0);
			Form_pg_type typtuple = (Form_pg_type) GETSTRUCT(tuple);

			appendStringInfoString(&result,
2698
								   map_multipart_sql_identifier_to_xml_name((typtuple->typtype == TYPTYPE_DOMAIN) ? "Domain" : "UDT",
2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715
																			get_database_name(MyDatabaseId),
																			get_namespace_name(typtuple->typnamespace),
																			NameStr(typtuple->typname)));

			ReleaseSysCache(tuple);
		}
	}

	return result.data;
}


/*
 * Map a collection of SQL data types to XML Schema data types; see
 * SQL/XML:2002 section 9.10.
 */
static const char *
2716
map_sql_typecoll_to_xmlschema_types(List *tupdesc_list)
2717
{
2718 2719
	List	   *uniquetypes = NIL;
	int			i;
2720
	StringInfoData result;
2721
	ListCell   *cell0;
2722

2723 2724
	/* extract all column types used in the set of TupleDescs */
	foreach(cell0, tupdesc_list)
2725
	{
2726
		TupleDesc tupdesc = (TupleDesc) lfirst(cell0);
2727

2728
		for (i = 0; i < tupdesc->natts; i++)
2729
		{
2730
			if (tupdesc->attrs[i]->attisdropped)
2731
				continue;
2732 2733
			uniquetypes = list_append_unique_oid(uniquetypes,
												 tupdesc->attrs[i]->atttypid);
2734
		}
2735 2736 2737
	}

	/* add base types of domains */
2738
	foreach(cell0, uniquetypes)
2739
	{
2740 2741
		Oid typid = lfirst_oid(cell0);
		Oid basetypid = getBaseType(typid);
2742

2743 2744
		if (basetypid != typid)
			uniquetypes = list_append_unique_oid(uniquetypes, basetypid);
2745 2746
	}

2747
	/* Convert to textual form */
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	initStringInfo(&result);

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	foreach(cell0, uniquetypes)
	{
		appendStringInfo(&result, "%s\n",
						 map_sql_type_to_xmlschema_type(lfirst_oid(cell0),
														-1));
	}
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	return result.data;
}


/*
 * Map an SQL data type to a named XML Schema data type; see SQL/XML
 * sections 9.11 and 9.15.
 *
 * (The distinction between 9.11 and 9.15 is basically that 9.15 adds
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 * a name attribute, which this function does.  The name-less version
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 * 9.11 doesn't appear to be required anywhere.)
 */
static const char *
map_sql_type_to_xmlschema_type(Oid typeoid, int typmod)
{
	StringInfoData result;
	const char *typename = map_sql_type_to_xml_name(typeoid, typmod);

	initStringInfo(&result);

	if (typeoid == XMLOID)
	{
		appendStringInfo(&result,
						 "<xsd:complexType mixed=\"true\">\n"
						 "  <xsd:sequence>\n"
						 "    <xsd:any name=\"element\" minOccurs=\"0\" maxOccurs=\"unbounded\" processContents=\"skip\"/>\n"
						 "  </xsd:sequence>\n"
						 "</xsd:complexType>\n");
	}
	else
	{
		appendStringInfo(&result,
						 "<xsd:simpleType name=\"%s\">\n", typename);

		switch(typeoid)
		{
			case BPCHAROID:
			case VARCHAROID:
			case TEXTOID:
				if (typmod != -1)
					appendStringInfo(&result,
									 "  <xsd:restriction base=\"xsd:string\">\n"
									 "    <xsd:maxLength value=\"%d\"/>\n"
									 "  </xsd:restriction>\n",
									 typmod - VARHDRSZ);
				break;

			case BYTEAOID:
				appendStringInfo(&result,
								 "  <xsd:restriction base=\"xsd:%s\">\n"
								 "  </xsd:restriction>\n",
								 xmlbinary == XMLBINARY_BASE64 ? "base64Binary" : "hexBinary");

			case NUMERICOID:
				if (typmod != -1)
					appendStringInfo(&result,
									 "  <xsd:restriction base=\"xsd:decimal\">\n"
									 "    <xsd:totalDigits value=\"%d\"/>\n"
									 "    <xsd:fractionDigits value=\"%d\"/>\n"
									 "  </xsd:restriction>\n",
									 ((typmod - VARHDRSZ) >> 16) & 0xffff,
									 (typmod - VARHDRSZ) & 0xffff);
				break;

			case INT2OID:
				appendStringInfo(&result,
								 "  <xsd:restriction base=\"xsd:short\">\n"
								 "    <xsd:maxInclusive value=\"%d\"/>\n"
								 "    <xsd:minInclusive value=\"%d\"/>\n"
								 "  </xsd:restriction>\n",
								 SHRT_MAX, SHRT_MIN);
				break;

			case INT4OID:
				appendStringInfo(&result,
								 "  <xsd:restriction base='xsd:int'>\n"
								 "    <xsd:maxInclusive value=\"%d\"/>\n"
								 "    <xsd:minInclusive value=\"%d\"/>\n"
								 "  </xsd:restriction>\n",
								 INT_MAX, INT_MIN);
				break;

			case INT8OID:
				appendStringInfo(&result,
								 "  <xsd:restriction base=\"xsd:long\">\n"
								 "    <xsd:maxInclusive value=\"" INT64_FORMAT "\"/>\n"
								 "    <xsd:minInclusive value=\"" INT64_FORMAT "\"/>\n"
								 "  </xsd:restriction>\n",
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								 (((uint64) 1) << (sizeof(int64) * 8 - 1)) - 1,
								 (((uint64) 1) << (sizeof(int64) * 8 - 1)));
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				break;

			case FLOAT4OID:
				appendStringInfo(&result,
								 "  <xsd:restriction base=\"xsd:float\"></xsd:restriction>\n");
				break;

			case FLOAT8OID:
				appendStringInfo(&result,
								 "  <xsd:restriction base=\"xsd:double\"></xsd:restriction>\n");
				break;

			case BOOLOID:
				appendStringInfo(&result,
								 "  <xsd:restriction base=\"xsd:boolean\"></xsd:restriction>\n");
				break;

			case TIMEOID:
			case TIMETZOID:
			{
				const char *tz = (typeoid == TIMETZOID ? "(+|-)\\p{Nd}{2}:\\p{Nd}{2}" : "");

				if (typmod == -1)
					appendStringInfo(&result,
									 "  <xsd:restriction base=\"xsd:time\">\n"
									 "    <xsd:pattern value=\"\\p{Nd}{2}:\\p{Nd}{2}:\\p{Nd}{2}(.\\p{Nd}+)?%s\"/>\n"
									 "  </xsd:restriction>\n", tz);
				else if (typmod == 0)
					appendStringInfo(&result,
									 "  <xsd:restriction base=\"xsd:time\">\n"
									 "    <xsd:pattern value=\"\\p{Nd}{2}:\\p{Nd}{2}:\\p{Nd}{2}%s\"/>\n"
									 "  </xsd:restriction>\n", tz);
				else
					appendStringInfo(&result,
									 "  <xsd:restriction base=\"xsd:time\">\n"
									 "    <xsd:pattern value=\"\\p{Nd}{2}:\\p{Nd}{2}:\\p{Nd}{2}.\\p{Nd}{%d}%s\"/>\n"
									 "  </xsd:restriction>\n", typmod - VARHDRSZ, tz);
				break;
			}

			case TIMESTAMPOID:
			case TIMESTAMPTZOID:
			{
				const char *tz = (typeoid == TIMESTAMPTZOID ? "(+|-)\\p{Nd}{2}:\\p{Nd}{2}" : "");

				if (typmod == -1)
					appendStringInfo(&result,
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									 "  <xsd:restriction base=\"xsd:dateTime\">\n"
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									 "    <xsd:pattern value=\"\\p{Nd}{4}-\\p{Nd}{2}-\\p{Nd}{2}T\\p{Nd}{2}:\\p{Nd}{2}:\\p{Nd}{2}(.\\p{Nd}+)?%s\"/>\n"
									 "  </xsd:restriction>\n", tz);
				else if (typmod == 0)
					appendStringInfo(&result,
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									 "  <xsd:restriction base=\"xsd:dateTime\">\n"
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									 "    <xsd:pattern value=\"\\p{Nd}{4}-\\p{Nd}{2}-\\p{Nd}{2}T\\p{Nd}{2}:\\p{Nd}{2}:\\p{Nd}{2}%s\"/>\n"
									 "  </xsd:restriction>\n", tz);
				else
					appendStringInfo(&result,
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									 "  <xsd:restriction base=\"xsd:dateTime\">\n"
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									 "    <xsd:pattern value=\"\\p{Nd}{4}-\\p{Nd}{2}-\\p{Nd}{2}T\\p{Nd}{2}:\\p{Nd}{2}:\\p{Nd}{2}.\\p{Nd}{%d}%s\"/>\n"
									 "  </xsd:restriction>\n", typmod - VARHDRSZ, tz);
				break;
			}

			case DATEOID:
				appendStringInfo(&result,
								 "  <xsd:restriction base=\"xsd:date\">\n"
								 "    <xsd:pattern value=\"\\p{Nd}{4}-\\p{Nd}{2}-\\p{Nd}{2}\"/>\n"
								 "  </xsd:restriction>\n");
								 break;

			default:
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				if (get_typtype(typeoid) == TYPTYPE_DOMAIN)
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				{
					Oid base_typeoid;
					int32 base_typmod = -1;

					base_typeoid = getBaseTypeAndTypmod(typeoid, &base_typmod);

					appendStringInfo(&result,
									 "  <xsd:restriction base=\"%s\">\n",
									 map_sql_type_to_xml_name(base_typeoid, base_typmod));
				}
		}
		appendStringInfo(&result,
						 "</xsd:simpleType>\n");
	}

	return result.data;
}


/*
 * Map an SQL row to an XML element, taking the row from the active
 * SPI cursor.  See also SQL/XML:2003 section 9.12.
 */
static void
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SPI_sql_row_to_xmlelement(int rownum, StringInfo result, char *tablename, bool nulls, bool tableforest, const char *targetns, bool top_level)
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{
	int			i;
	char	   *xmltn;

	if (tablename)
		xmltn = map_sql_identifier_to_xml_name(tablename, true, false);
	else
	{
		if (tableforest)
			xmltn = "row";
		else
			xmltn = "table";
	}

	if (tableforest)
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		xmldata_root_element_start(result, xmltn, NULL, targetns, top_level);
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	else
		appendStringInfoString(result, "<row>\n");

	for(i = 1; i <= SPI_tuptable->tupdesc->natts; i++)
	{
		char *colname;
		Datum colval;
		bool isnull;

		colname = map_sql_identifier_to_xml_name(SPI_fname(SPI_tuptable->tupdesc, i), true, false);
		colval = SPI_getbinval(SPI_tuptable->vals[rownum], SPI_tuptable->tupdesc, i, &isnull);

		if (isnull)
		{
			if (nulls)
				appendStringInfo(result, "  <%s xsi:nil='true'/>\n", colname);

		}
		else
			appendStringInfo(result, "  <%s>%s</%s>\n",
							 colname, map_sql_value_to_xml_value(colval, SPI_gettypeid(SPI_tuptable->tupdesc, i)),
							 colname);
	}

	if (tableforest)
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	{
		xmldata_root_element_end(result, xmltn);
		appendStringInfoChar(result, '\n');
	}
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	else
		appendStringInfoString(result, "</row>\n\n");
}
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/*
 * XPath related functions
 */

#ifdef USE_LIBXML
/* 
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 * Convert XML node to text (dump subtree in case of element, return value otherwise)
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 */
text *
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xml_xmlnodetoxmltype(xmlNodePtr cur)
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{
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	xmlChar    			*str;
	xmltype				*result;
	size_t				len;
	xmlBufferPtr 		buf;
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	if (cur->type == XML_ELEMENT_NODE)
	{
		buf = xmlBufferCreate();
		xmlNodeDump(buf, NULL, cur, 0, 1);
		result = xmlBuffer_to_xmltype(buf);
		xmlBufferFree(buf);
	}
	else
	{
		str = xmlXPathCastNodeToString(cur);
		len = strlen((char *) str);
		result = (text *) palloc(len + VARHDRSZ);
		SET_VARSIZE(result, len + VARHDRSZ);
		memcpy(VARDATA(result), str, len);
	}
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	return result;
}
#endif

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/*
 * Evaluate XPath expression and return array of XML values.
 * As we have no support of XQuery sequences yet, this functions seems
 * to be the most useful one (array of XML functions plays a role of
 * some kind of substritution for XQuery sequences).
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 *
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 * Workaround here: we parse XML data in different way to allow XPath for
 * fragments (see "XPath for fragment" TODO comment inside).
 */
Datum
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xpath(PG_FUNCTION_ARGS)
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{
#ifdef USE_LIBXML
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	text	   *xpath_expr_text = PG_GETARG_TEXT_P(0);
	xmltype	   *data = PG_GETARG_XML_P(1);
	ArrayType  *namespaces = PG_GETARG_ARRAYTYPE_P(2);

	ArrayBuildState	   *astate = NULL;
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	xmlParserCtxtPtr	ctxt = NULL;
	xmlDocPtr			doc = NULL;
	xmlXPathContextPtr	xpathctx = NULL;
	xmlXPathCompExprPtr	xpathcomp = NULL;
	xmlXPathObjectPtr	xpathobj = NULL;
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	int32		len;
	int32		xpath_len;
	xmlChar	   *string;
	xmlChar	   *xpath_expr;
	int			i;
	int			res_nitems;
	int			ndim;
	int			ns_count;
	char	  **ns_names;
	char	  **ns_uris;

	/*
	 * Namespace mappings are passed as text[].  If an empty array is
	 * passed (ndim = 0, "0-dimentional"), then there are no namespace
	 * mappings.  Else, a 2-dimentional array with length of the
	 * second axis being equal to 2 should be passed, i.e., every
	 * subarray contains 2 elements, the first element defining the
	 * name, the second one the URI.  Example: ARRAY[ARRAY['myns',
	 * 'http://example.com'], ARRAY['myns2', 'http://example2.com']].
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	 */
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	ndim = ARR_NDIM(namespaces);
	if (ndim != 0)
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	{
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		bits8	   *bitmap;
		int			bitmask;
		int16		typlen;
		bool		typbyval;
		char		typalign;
		char	   *ptr;
		int		   *dims;

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		dims = ARR_DIMS(namespaces);
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		if (ndim != 2 || dims[1] != 2)
			ereport(ERROR, (errmsg("invalid array for XML namespace mapping"),
							errdetail("The array must be two-dimensional with length of the second axis equal to 2."),
							errcode(ERRCODE_DATA_EXCEPTION)));

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		Assert(ARR_ELEMTYPE(namespaces) == TEXTOID);
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		ns_count = ArrayGetNItems(ndim, dims) / 2; /* number of NS mappings */
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		get_typlenbyvalalign(ARR_ELEMTYPE(namespaces),
							 &typlen, &typbyval, &typalign);
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		ns_names = palloc(ns_count * sizeof(char *));
		ns_uris = palloc(ns_count * sizeof(char *));
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		ptr = ARR_DATA_PTR(namespaces);
		bitmap = ARR_NULLBITMAP(namespaces);
		bitmask = 1;
		for (i = 0; i < ns_count * 2; i++)
		{
			if (bitmap && (*bitmap & bitmask) == 0)
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				ereport(ERROR, (errmsg("neither namespace name nor URI may be null")));
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			else
			{
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				if (i % 2 == 0)
					ns_names[i / 2] = DatumGetCString(DirectFunctionCall1(textout,
																		  PointerGetDatum(ptr)));
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				else
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					ns_uris[i / 2] = DatumGetCString(DirectFunctionCall1(textout,
																		 PointerGetDatum(ptr)));
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				ptr = att_addlength_pointer(ptr, typlen, ptr);
				ptr = (char *) att_align_nominal(ptr, typalign);
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			}
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			/* advance bitmap pointer if any */
			if (bitmap)
			{
				bitmask <<= 1;
				if (bitmask == 0x100)
				{
					bitmap++;
					bitmask = 1;
				}
			}
		}
	}
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	else
	{
		ns_count = 0;
		ns_names = NULL;
		ns_uris = NULL;
	}

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	len = VARSIZE(data) - VARHDRSZ;
	xpath_len = VARSIZE(xpath_expr_text) - VARHDRSZ;
	if (xpath_len == 0)
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		ereport(ERROR, (errmsg("empty XPath expression"),
						errcode(ERRCODE_DATA_EXCEPTION)));

	/*
	 * To handle both documents and fragments, regardless of the fact
	 * whether the XML datum has a single root (XML well-formedness),
	 * we wrap the XML datum in a dummy element (<x>...</x>) and
	 * extend the XPath expression accordingly.  To do it, throw away
	 * the XML prolog, if any.
	 */
	if ((len > 4) && xmlStrncmp((xmlChar *) VARDATA(data), (xmlChar *) "<?xml", 5) == 0)
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	{
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		i = 5;
		while ((i < len) && (('?' != (VARDATA(data))[i - 1]) || ('>' != (VARDATA(data))[i])))
			i++;

		if (i == len)
			xml_ereport(ERROR, ERRCODE_INTERNAL_ERROR,
						"could not parse XML data");

		++i;
		string = xmlStrncatNew((xmlChar *) "<x>", (xmlChar *) VARDATA(data) + i, len - i);
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	}
	else
		string = xmlStrncatNew((xmlChar *) "<x>", (xmlChar *) VARDATA(data), len);
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	string = xmlStrncat(string, (xmlChar *) "</x>", 5);
	len += 7;
	xpath_expr = xmlStrncatNew((xmlChar *) "/x", (xmlChar *) VARDATA(xpath_expr_text), xpath_len);
	xpath_len += 2;

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	xml_init();

	PG_TRY();
	{
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		/*
		 * redundant XML parsing (two parsings for the same value *
		 * during one command execution are possible)
		 */
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		ctxt = xmlNewParserCtxt();
		if (ctxt == NULL)
			xml_ereport(ERROR, ERRCODE_INTERNAL_ERROR,
						"could not allocate parser context");
		doc = xmlCtxtReadMemory(ctxt, (char *) string, len, NULL, NULL, 0);
		if (doc == NULL)
			xml_ereport(ERROR, ERRCODE_INVALID_XML_DOCUMENT,
						"could not parse XML data");
		xpathctx = xmlXPathNewContext(doc);
		if (xpathctx == NULL)
			xml_ereport(ERROR, ERRCODE_INTERNAL_ERROR,
						"could not allocate XPath context");
		xpathctx->node = xmlDocGetRootElement(doc);
		if (xpathctx->node == NULL)
			xml_ereport(ERROR, ERRCODE_INTERNAL_ERROR,
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						"could not find root XML element");
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		/* register namespaces, if any */
		if ((ns_count > 0) && ns_names && ns_uris)
			for (i = 0; i < ns_count; i++)
				if (0 != xmlXPathRegisterNs(xpathctx, (xmlChar *) ns_names[i], (xmlChar *) ns_uris[i]))
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					ereport(ERROR,
							(errmsg("could not register XML namespace with name \"%s\" and URI \"%s\"",
									ns_names[i], ns_uris[i])));

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		xpathcomp = xmlXPathCompile(xpath_expr);
		if (xpathcomp == NULL)
			xml_ereport(ERROR, ERRCODE_INTERNAL_ERROR,
						"invalid XPath expression"); /* TODO: show proper XPath error details */
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		xpathobj = xmlXPathCompiledEval(xpathcomp, xpathctx);
		if (xpathobj == NULL)
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			ereport(ERROR, (errmsg("could not create XPath object"))); /* TODO: reason? */

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		xmlXPathFreeCompExpr(xpathcomp);
		xpathcomp = NULL;

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		/* return empty array in cases when nothing is found */
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		if (xpathobj->nodesetval == NULL)
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			res_nitems = 0;
		else
			res_nitems = xpathobj->nodesetval->nodeNr;

		if (res_nitems)
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			for (i = 0; i < xpathobj->nodesetval->nodeNr; i++)
			{
				Datum		elem;
				bool		elemisnull = false;
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				elem = PointerGetDatum(xml_xmlnodetoxmltype(xpathobj->nodesetval->nodeTab[i]));
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				astate = accumArrayResult(astate, elem,
										  elemisnull, XMLOID,
										  CurrentMemoryContext);
			}
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		xmlXPathFreeObject(xpathobj);
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		xpathobj = NULL;
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		xmlXPathFreeContext(xpathctx);
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		xpathctx = NULL;
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		xmlFreeDoc(doc);
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		doc = NULL;
		xmlFreeParserCtxt(ctxt);
		ctxt = NULL;
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		xmlCleanupParser();
	}
	PG_CATCH();
	{
		if (xpathcomp)
			xmlXPathFreeCompExpr(xpathcomp);
		if (xpathobj)
			xmlXPathFreeObject(xpathobj);
		if (xpathctx)
			xmlXPathFreeContext(xpathctx);
		if (doc)
			xmlFreeDoc(doc);
		if (ctxt)
			xmlFreeParserCtxt(ctxt);
		xmlCleanupParser();

		PG_RE_THROW();
	}
	PG_END_TRY();
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	if (res_nitems == 0)
		PG_RETURN_ARRAYTYPE_P(construct_empty_array(XMLOID));
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	else
		PG_RETURN_ARRAYTYPE_P(makeArrayResult(astate, CurrentMemoryContext));
#else
	NO_XML_SUPPORT();
	return 0;
#endif
}