mirror of https://github.com/postgres/postgres
Peter Eisentraut
19 years ago
parent
ed1e9cd501
commit
8c1de5fb00
@ -0,0 +1,942 @@ |
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/*-------------------------------------------------------------------------
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* |
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* xml.c |
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* XML data type support. |
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* |
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* |
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* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group |
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* Portions Copyright (c) 1994, Regents of the University of California |
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* |
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* $PostgreSQL: pgsql/src/backend/utils/adt/xml.c,v 1.1 2006/12/21 16:05:15 petere Exp $ |
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* |
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*------------------------------------------------------------------------- |
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*/ |
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/*
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* Generally, XML type support is only available when libxml use was |
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* configured during the build. But even if that is not done, the |
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* type and all the functions are available, but most of them will |
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* fail. For one thing, this avoids having to manage variant catalog |
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* installations. But it also has nice effects such as that you can |
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* dump a database containing XML type data even if the server is not |
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* linked with libxml. |
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*/ |
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#include "postgres.h" |
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#ifdef USE_LIBXML |
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#include <libxml/chvalid.h> |
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#include <libxml/parser.h> |
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#include <libxml/tree.h> |
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#include <libxml/uri.h> |
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#include <libxml/xmlerror.h> |
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#endif /* USE_LIBXML */ |
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#include "fmgr.h" |
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#include "mb/pg_wchar.h" |
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#include "nodes/execnodes.h" |
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#include "utils/builtins.h" |
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#include "utils/xml.h" |
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#ifdef USE_LIBXML |
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/*
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* A couple of useful macros (similar to ones from libxml/parse.c) |
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*/ |
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#define CMP4( s, c1, c2, c3, c4 ) \ |
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( ((unsigned char *) s)[ 0 ] == c1 && ((unsigned char *) s)[ 1 ] == c2 && \
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((unsigned char *) s)[ 2 ] == c3 && ((unsigned char *) s)[ 3 ] == c4 ) |
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#define CMP5( s, c1, c2, c3, c4, c5 ) \ |
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( CMP4( s, c1, c2, c3, c4 ) && ((unsigned char *) s)[ 4 ] == c5 ) |
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#define PG_XML_DEFAULT_URI "dummy.xml" |
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#define XML_ERRBUF_SIZE 200 |
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static void xml_init(void); |
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static void *xml_palloc(size_t size); |
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static void *xml_repalloc(void *ptr, size_t size); |
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static void xml_pfree(void *ptr); |
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static char *xml_pstrdup(const char *string); |
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static void xml_ereport(int level, char *msg, void *ctxt); |
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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, char *msg, int errcode); |
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static xmlChar *xml_text2xmlChar(text *in); |
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static xmlDocPtr xml_parse(text *data, int opts, bool is_document); |
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/* Global variables */ |
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/* taken from contrib/xml2 */ |
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/* FIXME: DO NOT USE global vars !!! */ |
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char *xml_errbuf; /* per line error buffer */ |
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char *xml_errmsg = NULL; /* overall error message */ |
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#endif /* USE_LIBXML */ |
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#define NO_XML_SUPPORT() ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), errmsg("no XML support in this installation"))) |
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Datum |
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xml_in(PG_FUNCTION_ARGS) |
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{ |
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#ifdef USE_LIBXML |
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char *s = PG_GETARG_CSTRING(0); |
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size_t len; |
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xmltype *vardata; |
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len = strlen(s); |
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vardata = palloc(len + VARHDRSZ); |
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VARATT_SIZEP(vardata) = len + VARHDRSZ; |
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memcpy(VARDATA(vardata), s, len); |
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/*
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* Parse the data to check if it is well-formed XML data. Assume |
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* that ERROR occurred if parsing failed. Do we need DTD |
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* validation (if DTD exists)? |
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*/ |
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xml_parse(vardata, XML_PARSE_DTDATTR | XML_PARSE_DTDVALID, false); |
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PG_RETURN_XML_P(vardata); |
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#else |
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NO_XML_SUPPORT(); |
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return 0; |
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#endif |
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} |
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Datum |
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xml_out(PG_FUNCTION_ARGS) |
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{ |
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xmltype *s = PG_GETARG_XML_P(0); |
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char *result; |
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int32 len; |
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len = VARSIZE(s) - VARHDRSZ; |
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result = palloc(len + 1); |
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memcpy(result, VARDATA(s), len); |
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result[len] = '\0'; |
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PG_RETURN_CSTRING(result); |
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} |
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#ifdef USE_LIBXML |
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static void |
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appendStringInfoText(StringInfo str, const text *t) |
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{ |
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appendBinaryStringInfo(str, VARDATA(t), VARSIZE(t) - VARHDRSZ); |
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} |
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static xmltype * |
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stringinfo_to_xmltype(StringInfo buf) |
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{ |
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int32 len; |
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xmltype *result; |
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len = buf->len + VARHDRSZ; |
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result = palloc(len); |
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VARATT_SIZEP(result) = len; |
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memcpy(VARDATA(result), buf->data, buf->len); |
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return result; |
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} |
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#endif |
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Datum |
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xmlcomment(PG_FUNCTION_ARGS) |
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{ |
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#ifdef USE_LIBXML |
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text *arg = PG_GETARG_TEXT_P(0); |
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int len = VARATT_SIZEP(arg) - VARHDRSZ; |
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StringInfoData buf; |
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int i; |
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/* check for "--" in string or "-" at the end */ |
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for (i = 1; i < len; i++) |
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if ((VARDATA(arg)[i] == '-' && VARDATA(arg)[i - 1] == '-') |
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|| (VARDATA(arg)[i] == '-' && i == len - 1)) |
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ereport(ERROR, |
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(errcode(ERRCODE_INVALID_XML_COMMENT), |
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errmsg("invalid XML comment"))); |
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initStringInfo(&buf); |
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appendStringInfo(&buf, "<!--"); |
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appendStringInfoText(&buf, arg); |
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appendStringInfo(&buf, "-->"); |
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PG_RETURN_XML_P(stringinfo_to_xmltype(&buf)); |
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#else |
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NO_XML_SUPPORT(); |
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return 0; |
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#endif |
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} |
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Datum |
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xmlparse(PG_FUNCTION_ARGS) |
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{ |
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#ifdef USE_LIBXML |
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text *data; |
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bool is_document; |
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bool preserve_whitespace; |
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data = PG_GETARG_TEXT_P(0); |
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if (PG_NARGS() >= 2) |
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is_document = PG_GETARG_BOOL(1); |
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else |
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is_document = false; |
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if (PG_NARGS() >= 3) |
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preserve_whitespace = PG_GETARG_BOOL(2); |
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else |
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/*
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* Since the XMLPARSE grammar makes STRIP WHITESPACE the |
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* default, this argument should really default to false. But |
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* until we have actually implemented whitespace stripping, |
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* this would be annoying. |
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*/ |
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preserve_whitespace = true; |
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if (!preserve_whitespace) |
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ereport(WARNING, |
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED), |
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errmsg("XMLPARSE with STRIP WHITESPACE is not implemented"))); |
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/*
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* Note, that here we try to apply DTD defaults |
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* (XML_PARSE_DTDATTR) according to SQL/XML:10.16.7.d: 'Default |
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* valies defined by internal DTD are applied'. As for external |
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* DTDs, we try to support them too, (see SQL/XML:10.16.7.e) |
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*/ |
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xml_parse(data, XML_PARSE_DTDATTR, is_document); /* assume that ERROR occurred if parsing failed */ |
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PG_RETURN_XML_P(data); |
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#else |
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NO_XML_SUPPORT(); |
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return 0; |
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#endif |
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} |
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Datum |
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xmlpi(PG_FUNCTION_ARGS) |
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{ |
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#ifdef USE_LIBXML |
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char *target = NameStr(*PG_GETARG_NAME(0)); |
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StringInfoData buf; |
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if (strlen(target) >= 3 |
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&& (target[0] == 'x' || target[0] == 'X') |
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&& (target[1] == 'm' || target[1] == 'M') |
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&& (target[2] == 'l' || target[2] == 'L')) |
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{ |
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ereport(ERROR, |
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(errcode(ERRCODE_SYNTAX_ERROR), |
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errmsg("invalid XML processing instruction"), |
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errdetail("XML processing instruction target name cannot start with \"xml\"."))); |
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} |
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initStringInfo(&buf); |
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appendStringInfo(&buf, "<?"); |
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appendStringInfoString(&buf, map_sql_identifier_to_xml_name(target, false)); |
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if (PG_NARGS() > 1) |
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{ |
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text *arg = PG_GETARG_TEXT_P(1); |
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char *string; |
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string = DatumGetCString(DirectFunctionCall1(textout, PointerGetDatum(arg))); |
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if (strstr(string, "?>")) |
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ereport(ERROR, |
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(errcode(ERRCODE_INVALID_XML_PROCESSING_INSTRUCTION), |
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errmsg("invalid XML processing instruction"), |
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errdetail("XML processing instruction cannot contain \"?>\"."))); |
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appendStringInfoString(&buf, " "); |
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appendStringInfoString(&buf, string); |
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} |
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appendStringInfoString(&buf, "?>"); |
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PG_RETURN_XML_P(stringinfo_to_xmltype(&buf)); |
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#else |
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NO_XML_SUPPORT(); |
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return 0; |
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#endif |
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} |
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Datum |
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xmlroot(PG_FUNCTION_ARGS) |
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{ |
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#ifdef USE_LIBXML |
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xmltype *data; |
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text *version; |
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int standalone; |
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StringInfoData buf; |
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if (PG_ARGISNULL(0)) |
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PG_RETURN_NULL(); |
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else |
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data = PG_GETARG_XML_P(0); |
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if (PG_ARGISNULL(1)) |
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version = NULL; |
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else |
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version = PG_GETARG_TEXT_P(1); |
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if (PG_ARGISNULL(2)) |
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standalone = 0; |
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else |
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{ |
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bool tmp = PG_GETARG_BOOL(2); |
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standalone = (tmp ? 1 : -1); |
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} |
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/*
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* FIXME: This is probably supposed to be cleverer if there |
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* already is an XML preamble. |
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*/ |
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initStringInfo(&buf); |
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appendStringInfo(&buf,"<?xml"); |
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if (version) { |
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appendStringInfo(&buf, " version=\""); |
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appendStringInfoText(&buf, version); |
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appendStringInfo(&buf, "\""); |
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} |
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if (standalone) |
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appendStringInfo(&buf, " standalone=\"%s\"", (standalone == 1 ? "yes" : "no")); |
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appendStringInfo(&buf, "?>"); |
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appendStringInfoText(&buf, (text *) data); |
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PG_RETURN_XML_P(stringinfo_to_xmltype(&buf)); |
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#else |
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NO_XML_SUPPORT(); |
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return 0; |
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#endif |
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} |
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/*
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* Validate document (given as string) against DTD (given as external link) |
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* TODO !!! use text instead of cstring for second arg |
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* TODO allow passing DTD as a string value (not only as an URI) |
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* TODO redesign (see comment with '!!!' below) |
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*/ |
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Datum |
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xmlvalidate(PG_FUNCTION_ARGS) |
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{ |
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#ifdef USE_LIBXML |
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text *data = PG_GETARG_TEXT_P(0); |
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text *dtdOrUri = PG_GETARG_TEXT_P(1); |
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bool result = FALSE; |
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xmlParserCtxtPtr ctxt; /* the parser context */ |
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xmlDocPtr doc; /* the resulting document tree */ |
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xmlDtdPtr dtd; |
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xml_init(); |
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ctxt = xmlNewParserCtxt(); |
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if (ctxt == NULL) |
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xml_ereport(ERROR, "could not allocate parser context", ctxt); |
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doc = xmlCtxtReadMemory(ctxt, (char *) VARDATA(data),
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VARSIZE(data) - VARHDRSZ, PG_XML_DEFAULT_URI, NULL, 0); |
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if (doc == NULL) |
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xml_ereport(ERROR, "could not parse XML data", ctxt); |
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#if 0 |
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uri = xmlCreateURI(); |
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ereport(NOTICE, (errcode(0),errmsg(" dtd - %s", dtdOrUri))); |
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dtd = palloc(sizeof(xmlDtdPtr)); |
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uri = xmlParseURI(dtdOrUri); |
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if (uri == NULL) |
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xml_ereport(ERROR, "not implemented yet... (TODO)", ctxt); |
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else |
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#endif |
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dtd = xmlParseDTD(NULL, xml_text2xmlChar(dtdOrUri)); |
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if (dtd == NULL) |
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{ |
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#if 0 |
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xmlFreeDoc(doc); |
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xmlFreeParserCtxt(ctxt); |
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#endif |
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xml_ereport(ERROR, "could not load DTD", ctxt); |
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} |
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if (xmlValidateDtd(xmlNewValidCtxt(), doc, dtd) == 1) |
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result = TRUE; |
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#if 0 |
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xmlFreeURI(uri); |
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xmlFreeDtd(dtd); |
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xmlFreeDoc(doc); |
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xmlFreeParserCtxt(ctxt); |
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xmlCleanupParser(); |
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#endif |
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if (!result) |
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xml_ereport(NOTICE, "validation against DTD failed", ctxt); |
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PG_RETURN_BOOL(result); |
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#else /* not USE_LIBXML */ |
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NO_XML_SUPPORT(); |
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return 0; |
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#endif /* not USE_LIBXML */ |
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} |
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#ifdef USE_LIBXML |
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/*
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* Container for some init stuff (not good design!) |
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* TODO xmlChar is utf8-char, make proper tuning (initdb with enc!=utf8 and check) |
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*/ |
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static void |
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xml_init(void) |
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{ |
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/*
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* Currently, we have no pure UTF-8 support for internals -- check |
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* if we can work. |
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*/ |
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if (sizeof (char) != sizeof (xmlChar)) |
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ereport(ERROR,
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(errmsg("cannot initialize XML library"), |
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errdetail("libxml2 has incompatible char type: sizeof(char)=%u, sizeof(xmlChar)=%u.",
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sizeof(char), sizeof(xmlChar)))); |
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xmlMemSetup(xml_pfree, xml_palloc, xml_repalloc, xml_pstrdup); |
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xmlInitParser(); |
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LIBXML_TEST_VERSION; |
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/* do not flood PG's logfile with libxml error messages - reset error handler*/
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xmlSetGenericErrorFunc(NULL, xml_errorHandler); |
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xml_errmsg = NULL; |
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xml_errbuf = palloc(XML_ERRBUF_SIZE); |
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memset(xml_errbuf, 0, XML_ERRBUF_SIZE); |
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} |
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/*
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* Convert a C string to XML internal representation |
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* (same things as for TEXT, but with checking the data for well-formedness |
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* and, moreover, validation against DTD, if needed). |
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* NOTICE: We use TEXT type as internal storage type. In the future, |
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* we plan to create own storage type (maybe several types/strategies) |
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* TODO predefined DTDs / XSDs and validation |
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* TODO validation against XML Schema |
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* TODO maybe, libxml2's xmlreader is better? (do not construct DOM, yet do not use SAX - see xml_reader.c) |
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* TODO what about internal URI for docs? (see PG_XML_DEFAULT_URI below) |
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*/ |
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static xmlDocPtr |
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xml_parse(text *data, int opts, bool is_document) |
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{ |
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bool validationFailed = FALSE; |
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xmlParserCtxtPtr ctxt; /* the parser context */ |
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xmlDocPtr doc; /* the resulting document tree */ |
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int res_code; |
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int32 len; |
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xmlChar *string; |
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#ifdef XML_DEBUG_DTD_CONST |
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xmlDtdPtr dtd; /* pointer to DTD */ |
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#endif |
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xml_init(); |
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len = VARSIZE(data) - VARHDRSZ; /* will be useful later */ |
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string = xml_text2xmlChar(data); |
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ctxt = xmlNewParserCtxt(); |
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if (ctxt == NULL) |
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xml_ereport(ERROR, "could not allocate parser context", ctxt); |
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/* first, we try to parse the string as it is XML doc, then, as XML chunk */ |
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ereport(DEBUG3, (errmsg("string to parse: %s", string))); |
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if (len > 4 && CMP5(string, '<', '?', 'x', 'm', 'l')) |
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{ |
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/* consider it as DOCUMENT */ |
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doc = xmlCtxtReadMemory(ctxt, string, len, PG_XML_DEFAULT_URI, NULL, opts); |
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if (doc == NULL) |
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{ |
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xml_ereport(ERROR, "could not parse XML data", ctxt); |
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#if 0 |
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xmlFreeParserCtxt(ctxt); |
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xmlCleanupParser(); |
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ereport(ERROR, (errmsg("could not parse XML data"))); |
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#endif |
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} |
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} |
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else |
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{ |
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/* attempt to parse the string as if it is an XML fragment */ |
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ereport(DEBUG3, (errmsg("the string is not an XML doc, trying to parse as a CHUNK"))); |
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doc = xmlNewDoc(NULL); |
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/* TODO resolve: xmlParseBalancedChunkMemory assumes that string is UTF8 encoded! */ |
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res_code = xmlParseBalancedChunkMemory(doc, NULL, NULL, 0, string, NULL); |
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if (res_code != 0) |
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{ |
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xmlFreeParserCtxt(ctxt); |
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xmlCleanupParser(); |
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xml_ereport_by_code(ERROR, "could not parse XML data", res_code); |
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} |
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} |
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#ifdef XML_DEBUG_DTD_CONST |
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dtd = xmlParseDTD(NULL, (xmlChar *) XML_DEBUG_DTD_CONST); |
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xml_ereport(DEBUG3, "solid path to DTD was defined for debugging purposes", ctxt); |
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if (dtd == NULL) |
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{ |
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xml_ereport(ERROR, "could not parse DTD data", ctxt); |
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} |
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else |
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#else |
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/* if dtd for our xml data is detected... */ |
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if ((doc->intSubset != NULL) || (doc->extSubset != NULL)) |
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#endif |
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{ |
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/* assume that inline DTD exists - validation should be performed */ |
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#ifdef XML_DEBUG_DTD_CONST |
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if (xmlValidateDtd(xmlNewValidCtxt(), doc, dtd) != 1) |
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#else |
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if (ctxt->valid == 0) |
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#endif |
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{ |
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/* DTD exists, but validator reported 'validation failed' */ |
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validationFailed = TRUE; |
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} |
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} |
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|
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if (validationFailed) |
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xml_ereport(WARNING, "validation against DTD failed", ctxt); |
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|
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/* TODO encoding issues
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* (thoughts: |
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* CASE: |
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* - XML data has explicit encoding attribute in its prolog |
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* - if not, assume that enc. of XML data is the same as client's one |
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*
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* The common rule is to accept the XML data only if its encoding |
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* is the same as encoding of the storage (server's). The other possible |
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* option is to accept all the docs, but DO TRANSFORMATION and, if needed, |
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* change the prolog. |
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*
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* I think I'd stick the first way (for the 1st version),
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* it's much simplier (less errors...) |
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* ) */ |
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/* ... */ |
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xmlFreeParserCtxt(ctxt); |
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xmlCleanupParser(); |
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|
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ereport(DEBUG3, (errmsg("XML data successfully parsed, encoding: %s",
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(char *) doc->encoding))); |
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|
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return doc; |
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} |
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|
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|
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/*
|
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* xmlChar<->text convertions
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*/ |
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static xmlChar * |
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xml_text2xmlChar(text *in) |
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{ |
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int32 len = VARSIZE(in) - VARHDRSZ; |
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xmlChar *res; |
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|
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res = palloc(len + 1); |
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memcpy(res, VARDATA(in), len); |
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res[len] = '\0'; |
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|
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return(res); |
||||
} |
||||
|
||||
|
||||
/*
|
||||
* Wrappers for memory management functions
|
||||
*/ |
||||
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); |
||||
} |
||||
|
||||
|
||||
/*
|
||||
* Wrapper for "ereport" function.
|
||||
* Adds detail - libxml's native error message, if any. |
||||
*/ |
||||
static void |
||||
xml_ereport(int level, char *msg, void *ctxt) |
||||
{ |
||||
char *xmlErrDetail; |
||||
int xmlErrLen, i; |
||||
xmlErrorPtr libxmlErr = NULL; |
||||
|
||||
if (xml_errmsg != NULL) |
||||
{ |
||||
ereport(DEBUG1, (errmsg("%s", xml_errmsg))); |
||||
pfree(xml_errmsg); |
||||
} |
||||
|
||||
if (ctxt != NULL) |
||||
libxmlErr = xmlCtxtGetLastError(ctxt); |
||||
|
||||
if (libxmlErr == NULL) |
||||
{ |
||||
if (level == ERROR) |
||||
{ |
||||
xmlFreeParserCtxt(ctxt); |
||||
xmlCleanupParser(); |
||||
} |
||||
ereport(level, (errmsg(msg))); |
||||
} |
||||
else |
||||
{ |
||||
/* as usual, libxml error message contains '\n'; get rid of it */ |
||||
xmlErrLen = strlen(libxmlErr->message); /* - 1; */ |
||||
xmlErrDetail = (char *) palloc(xmlErrLen); |
||||
for (i = 0; i < xmlErrLen; i++) |
||||
{ |
||||
if (libxmlErr->message[i] == '\n') |
||||
xmlErrDetail[i] = '.'; |
||||
else |
||||
xmlErrDetail[i] = libxmlErr->message[i]; |
||||
} |
||||
if (level == ERROR) |
||||
{ |
||||
xmlFreeParserCtxt(ctxt); |
||||
xmlCleanupParser(); |
||||
} |
||||
ereport(level, (errmsg(msg), errdetail("%s", xmlErrDetail))); |
||||
} |
||||
} |
||||
|
||||
|
||||
/*
|
||||
* Error handler for libxml error messages |
||||
*/ |
||||
static void |
||||
xml_errorHandler(void *ctxt, const char *msg,...) |
||||
{ |
||||
va_list args; |
||||
|
||||
va_start(args, msg); |
||||
vsnprintf(xml_errbuf, XML_ERRBUF_SIZE, msg, args); |
||||
va_end(args); |
||||
/* Now copy the argument across */ |
||||
if (xml_errmsg == NULL) |
||||
xml_errmsg = pstrdup(xml_errbuf); |
||||
else |
||||
{ |
||||
int32 xsize = strlen(xml_errmsg); |
||||
|
||||
xml_errmsg = repalloc(xml_errmsg, (size_t) (xsize + strlen(xml_errbuf) + 1)); |
||||
strncpy(&xml_errmsg[xsize - 1], xml_errbuf, strlen(xml_errbuf)); |
||||
xml_errmsg[xsize + strlen(xml_errbuf) - 1] = '\0'; |
||||
} |
||||
memset(xml_errbuf, 0, XML_ERRBUF_SIZE); |
||||
} |
||||
|
||||
|
||||
/*
|
||||
* Return error message by libxml error code |
||||
* TODO make them closer to recommendations from Postgres manual |
||||
*/ |
||||
static void |
||||
xml_ereport_by_code(int level, char *msg, int code) |
||||
{ |
||||
const char *det; |
||||
|
||||
if (code < 0) |
||||
{ |
||||
ereport(level, (errmsg(msg))); |
||||
return; |
||||
} |
||||
|
||||
switch (code) { |
||||
case XML_ERR_INTERNAL_ERROR: |
||||
det = "libxml internal error"; |
||||
break; |
||||
case XML_ERR_ENTITY_LOOP: |
||||
det = "Detected an entity reference loop"; |
||||
break; |
||||
case XML_ERR_ENTITY_NOT_STARTED: |
||||
det = "EntityValue: \" or ' expected"; |
||||
break; |
||||
case XML_ERR_ENTITY_NOT_FINISHED: |
||||
det = "EntityValue: \" or ' expected"; |
||||
break; |
||||
case XML_ERR_ATTRIBUTE_NOT_STARTED: |
||||
det = "AttValue: \" or ' expected"; |
||||
break; |
||||
case XML_ERR_LT_IN_ATTRIBUTE: |
||||
det = "Unescaped '<' not allowed in attributes values"; |
||||
break; |
||||
case XML_ERR_LITERAL_NOT_STARTED: |
||||
det = "SystemLiteral \" or ' expected"; |
||||
break; |
||||
case XML_ERR_LITERAL_NOT_FINISHED: |
||||
det = "Unfinished System or Public ID \" or ' expected"; |
||||
break; |
||||
case XML_ERR_MISPLACED_CDATA_END: |
||||
det = "Sequence ']]>' not allowed in content"; |
||||
break; |
||||
case XML_ERR_URI_REQUIRED: |
||||
det = "SYSTEM or PUBLIC, the URI is missing"; |
||||
break; |
||||
case XML_ERR_PUBID_REQUIRED: |
||||
det = "PUBLIC, the Public Identifier is missing"; |
||||
break; |
||||
case XML_ERR_HYPHEN_IN_COMMENT: |
||||
det = "Comment must not contain '--' (double-hyphen)"; |
||||
break; |
||||
case XML_ERR_PI_NOT_STARTED: |
||||
det = "xmlParsePI : no target name"; |
||||
break; |
||||
case XML_ERR_RESERVED_XML_NAME: |
||||
det = "Invalid PI name"; |
||||
break; |
||||
case XML_ERR_NOTATION_NOT_STARTED: |
||||
det = "NOTATION: Name expected here"; |
||||
break; |
||||
case XML_ERR_NOTATION_NOT_FINISHED: |
||||
det = "'>' required to close NOTATION declaration"; |
||||
break; |
||||
case XML_ERR_VALUE_REQUIRED: |
||||
det = "Entity value required"; |
||||
break; |
||||
case XML_ERR_URI_FRAGMENT: |
||||
det = "Fragment not allowed"; |
||||
break; |
||||
case XML_ERR_ATTLIST_NOT_STARTED: |
||||
det = "'(' required to start ATTLIST enumeration"; |
||||
break; |
||||
case XML_ERR_NMTOKEN_REQUIRED: |
||||
det = "NmToken expected in ATTLIST enumeration"; |
||||
break; |
||||
case XML_ERR_ATTLIST_NOT_FINISHED: |
||||
det = "')' required to finish ATTLIST enumeration"; |
||||
break; |
||||
case XML_ERR_MIXED_NOT_STARTED: |
||||
det = "MixedContentDecl : '|' or ')*' expected"; |
||||
break; |
||||
case XML_ERR_PCDATA_REQUIRED: |
||||
det = "MixedContentDecl : '#PCDATA' expected"; |
||||
break; |
||||
case XML_ERR_ELEMCONTENT_NOT_STARTED: |
||||
det = "ContentDecl : Name or '(' expected"; |
||||
break; |
||||
case XML_ERR_ELEMCONTENT_NOT_FINISHED: |
||||
det = "ContentDecl : ',' '|' or ')' expected"; |
||||
break; |
||||
case XML_ERR_PEREF_IN_INT_SUBSET: |
||||
det = "PEReference: forbidden within markup decl in internal subset"; |
||||
break; |
||||
case XML_ERR_GT_REQUIRED: |
||||
det = "Expected '>'"; |
||||
break; |
||||
case XML_ERR_CONDSEC_INVALID: |
||||
det = "XML conditional section '[' expected"; |
||||
break; |
||||
case XML_ERR_EXT_SUBSET_NOT_FINISHED: |
||||
det = "Content error in the external subset"; |
||||
break; |
||||
case XML_ERR_CONDSEC_INVALID_KEYWORD: |
||||
det = "conditional section INCLUDE or IGNORE keyword expected"; |
||||
break; |
||||
case XML_ERR_CONDSEC_NOT_FINISHED: |
||||
det = "XML conditional section not closed"; |
||||
break; |
||||
case XML_ERR_XMLDECL_NOT_STARTED: |
||||
det = "Text declaration '<?xml' required"; |
||||
break; |
||||
case XML_ERR_XMLDECL_NOT_FINISHED: |
||||
det = "parsing XML declaration: '?>' expected"; |
||||
break; |
||||
case XML_ERR_EXT_ENTITY_STANDALONE: |
||||
det = "external parsed entities cannot be standalone"; |
||||
break; |
||||
case XML_ERR_ENTITYREF_SEMICOL_MISSING: |
||||
det = "EntityRef: expecting ';'"; |
||||
break; |
||||
case XML_ERR_DOCTYPE_NOT_FINISHED: |
||||
det = "DOCTYPE improperly terminated"; |
||||
break; |
||||
case XML_ERR_LTSLASH_REQUIRED: |
||||
det = "EndTag: '</' not found"; |
||||
break; |
||||
case XML_ERR_EQUAL_REQUIRED: |
||||
det = "Expected '='"; |
||||
break; |
||||
case XML_ERR_STRING_NOT_CLOSED: |
||||
det = "String not closed expecting \" or '"; |
||||
break; |
||||
case XML_ERR_STRING_NOT_STARTED: |
||||
det = "String not started expecting ' or \""; |
||||
break; |
||||
case XML_ERR_ENCODING_NAME: |
||||
det = "Invalid XML encoding name"; |
||||
break; |
||||
case XML_ERR_STANDALONE_VALUE: |
||||
det = "Standalone accepts only 'yes' or 'no'"; |
||||
break; |
||||
case XML_ERR_DOCUMENT_EMPTY: |
||||
det = "Document is empty"; |
||||
break; |
||||
case XML_ERR_DOCUMENT_END: |
||||
det = "Extra content at the end of the document"; |
||||
break; |
||||
case XML_ERR_NOT_WELL_BALANCED: |
||||
det = "Chunk is not well balanced"; |
||||
break; |
||||
case XML_ERR_EXTRA_CONTENT: |
||||
det = "Extra content at the end of well balanced chunk"; |
||||
break; |
||||
case XML_ERR_VERSION_MISSING: |
||||
det = "Malformed declaration expecting version"; |
||||
break; |
||||
/* more err codes... Please, keep the order! */ |
||||
case XML_ERR_ATTRIBUTE_WITHOUT_VALUE: /* 41 */ |
||||
det ="Attribute without value"; |
||||
break; |
||||
case XML_ERR_ATTRIBUTE_REDEFINED: |
||||
det ="Attribute defined more than once in the same element"; |
||||
break; |
||||
case XML_ERR_COMMENT_NOT_FINISHED: /* 45 */ |
||||
det = "Comment is not finished"; |
||||
break; |
||||
case XML_ERR_NAME_REQUIRED: /* 68 */ |
||||
det = "Element name not found"; |
||||
break; |
||||
case XML_ERR_TAG_NOT_FINISHED: /* 77 */ |
||||
det = "Closing tag not found"; |
||||
break; |
||||
default: |
||||
det = "Unregistered error (libxml error code: %d)"; |
||||
ereport(DEBUG1, (errmsg("Check out \"libxml/xmlerror.h\" and bring errcode \"%d\" processing to \"xml.c\".", code))); |
||||
} |
||||
|
||||
if (xml_errmsg != NULL) |
||||
{ |
||||
ereport(DEBUG1, (errmsg("%s", xml_errmsg))); |
||||
pfree(xml_errmsg); |
||||
} |
||||
|
||||
ereport(level, (errmsg(msg), errdetail(det, code))); |
||||
} |
||||
|
||||
|
||||
/*
|
||||
* Convert one char in the current server encoding to a Unicode |
||||
* codepoint. |
||||
*/ |
||||
static pg_wchar |
||||
sqlchar_to_unicode(unsigned char *s) |
||||
{ |
||||
int save_enc; |
||||
pg_wchar ret; |
||||
char *utf8string = pg_do_encoding_conversion(s, pg_mblen(s), GetDatabaseEncoding(), PG_UTF8); |
||||
|
||||
save_enc = GetDatabaseEncoding(); |
||||
SetDatabaseEncoding(PG_UTF8); |
||||
pg_mb2wchar_with_len(utf8string, &ret, pg_mblen(s)); |
||||
SetDatabaseEncoding(save_enc); |
||||
|
||||
return ret; |
||||
} |
||||
|
||||
|
||||
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 * |
||||
map_sql_identifier_to_xml_name(unsigned char *ident, bool fully_escaped) |
||||
{ |
||||
#ifdef USE_LIBXML |
||||
StringInfoData buf; |
||||
unsigned char *p; |
||||
|
||||
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_"); |
||||
else if (fully_escaped && p == ident |
||||
&& ( *p == 'x' || *p == 'X') |
||||
&& ( *(p+1) == 'm' || *(p+1) == 'M') |
||||
&& ( *(p+2) == 'l' || *(p+2) == 'L')) |
||||
{ |
||||
if (*p == 'x') |
||||
appendStringInfo(&buf, "_x0078_"); |
||||
else |
||||
appendStringInfo(&buf, "_x0058_"); |
||||
} |
||||
else |
||||
{ |
||||
pg_wchar u = sqlchar_to_unicode(p); |
||||
|
||||
if (!is_valid_xml_namechar(u) |
||||
|| (p == ident && !is_valid_xml_namefirst(u))) |
||||
appendStringInfo(&buf, "_x%04X_", (unsigned int) u); |
||||
else |
||||
appendBinaryStringInfo(&buf, p, pg_mblen(p)); |
||||
} |
||||
} |
||||
|
||||
return buf.data; |
||||
#else /* not USE_LIBXML */ |
||||
NO_XML_SUPPORT(); |
||||
return NULL; |
||||
#endif /* not USE_LIBXML */ |
||||
} |
||||
@ -0,0 +1,37 @@ |
||||
/*-------------------------------------------------------------------------
|
||||
* |
||||
* xml.h |
||||
* Declarations for XML data type support. |
||||
* |
||||
* |
||||
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group |
||||
* Portions Copyright (c) 1994, Regents of the University of California |
||||
* |
||||
* $PostgreSQL: pgsql/src/include/utils/xml.h,v 1.1 2006/12/21 16:05:16 petere Exp $ |
||||
* |
||||
*------------------------------------------------------------------------- |
||||
*/ |
||||
|
||||
#ifndef XML_H |
||||
#define XML_H |
||||
|
||||
#include "fmgr.h" |
||||
|
||||
typedef struct varlena xmltype; |
||||
|
||||
#define DatumGetXmlP(X) ((xmltype *) PG_DETOAST_DATUM(X)) |
||||
|
||||
#define PG_GETARG_XML_P(n) DatumGetXmlP(PG_GETARG_DATUM(n)) |
||||
#define PG_RETURN_XML_P(x) PG_RETURN_POINTER(x) |
||||
|
||||
extern Datum xml_in(PG_FUNCTION_ARGS); |
||||
extern Datum xml_out(PG_FUNCTION_ARGS); |
||||
extern Datum xmlcomment(PG_FUNCTION_ARGS); |
||||
extern Datum xmlparse(PG_FUNCTION_ARGS); |
||||
extern Datum xmlpi(PG_FUNCTION_ARGS); |
||||
extern Datum xmlroot(PG_FUNCTION_ARGS); |
||||
extern Datum xmlvalidate(PG_FUNCTION_ARGS); |
||||
|
||||
extern char *map_sql_identifier_to_xml_name(unsigned char *ident, bool fully_escaped); |
||||
|
||||
#endif /* XML_H */ |
||||
@ -0,0 +1,145 @@ |
||||
CREATE TABLE xmltest ( |
||||
id int, |
||||
data xml |
||||
); |
||||
INSERT INTO xmltest VALUES (1, '<value>one</value>'); |
||||
INSERT INTO xmltest VALUES (2, '<value>two</value>'); |
||||
INSERT INTO xmltest VALUES (3, '<wrong'); |
||||
ERROR: could not parse XML data |
||||
DETAIL: Expected '>' |
||||
SELECT * FROM xmltest; |
||||
id | data |
||||
----+-------------------- |
||||
1 | <value>one</value> |
||||
2 | <value>two</value> |
||||
(2 rows) |
||||
|
||||
SELECT xmlcomment('test'); |
||||
xmlcomment |
||||
------------- |
||||
<!--test--> |
||||
(1 row) |
||||
|
||||
SELECT xmlcomment('-test'); |
||||
xmlcomment |
||||
-------------- |
||||
<!---test--> |
||||
(1 row) |
||||
|
||||
SELECT xmlcomment('test-'); |
||||
ERROR: invalid XML comment |
||||
SELECT xmlcomment('--test'); |
||||
ERROR: invalid XML comment |
||||
SELECT xmlcomment('te st'); |
||||
xmlcomment |
||||
-------------- |
||||
<!--te st--> |
||||
(1 row) |
||||
|
||||
SELECT xmlconcat(xmlcomment('hello'), |
||||
xmlelement(NAME qux, 'foo'), |
||||
xmlcomment('world')); |
||||
xmlconcat |
||||
---------------------------------------- |
||||
<!--hello--><qux>foo</qux><!--world--> |
||||
(1 row) |
||||
|
||||
SELECT xmlconcat('hello', 'you'); |
||||
xmlconcat |
||||
----------- |
||||
helloyou |
||||
(1 row) |
||||
|
||||
SELECT xmlconcat(1, 2); |
||||
ERROR: argument of XMLCONCAT must be type xml, not type integer |
||||
SELECT xmlconcat('bad', '<syntax'); |
||||
ERROR: could not parse XML data |
||||
DETAIL: Expected '>' |
||||
SELECT xmlelement(name element, |
||||
xmlattributes (1 as one, 'deuce' as two), |
||||
'content'); |
||||
xmlelement |
||||
------------------------------------------------ |
||||
<element one="1" two="deuce">content</element> |
||||
(1 row) |
||||
|
||||
SELECT xmlelement(name element, |
||||
xmlattributes ('unnamed and wrong')); |
||||
ERROR: unnamed attribute value must be a column reference |
||||
SELECT xmlelement(name element, xmlelement(name nested, 'stuff')); |
||||
xmlelement |
||||
------------------------------------------- |
||||
<element><nested>stuff</nested></element> |
||||
(1 row) |
||||
|
||||
SELECT xmlelement(name employee, xmlforest(name, age, salary as pay)) FROM emp; |
||||
xmlelement |
||||
---------------------------------------------------------------------- |
||||
<employee><name>sharon</name><age>25</age><pay>1000</pay></employee> |
||||
<employee><name>sam</name><age>30</age><pay>2000</pay></employee> |
||||
<employee><name>bill</name><age>20</age><pay>1000</pay></employee> |
||||
<employee><name>jeff</name><age>23</age><pay>600</pay></employee> |
||||
<employee><name>cim</name><age>30</age><pay>400</pay></employee> |
||||
<employee><name>linda</name><age>19</age><pay>100</pay></employee> |
||||
(6 rows) |
||||
|
||||
SELECT xmlelement(name wrong, 37); |
||||
ERROR: argument of XMLELEMENT must be type xml, not type integer |
||||
SELECT xmlpi(name foo); |
||||
xmlpi |
||||
--------- |
||||
<?foo?> |
||||
(1 row) |
||||
|
||||
SELECT xmlpi(name xmlstuff); |
||||
ERROR: invalid XML processing instruction |
||||
DETAIL: XML processing instruction target name cannot start with "xml". |
||||
SELECT xmlpi(name foo, 'bar'); |
||||
xmlpi |
||||
------------- |
||||
<?foo bar?> |
||||
(1 row) |
||||
|
||||
SELECT xmlpi(name foo, 'in?>valid'); |
||||
ERROR: invalid XML processing instruction |
||||
DETAIL: XML processing instruction cannot contain "?>". |
||||
SELECT xmlroot ( |
||||
xmlelement ( |
||||
name gazonk, |
||||
xmlattributes ( |
||||
'val' AS name, |
||||
1 + 1 AS num |
||||
), |
||||
xmlelement ( |
||||
NAME qux, |
||||
'foo' |
||||
) |
||||
), |
||||
version '1.0', |
||||
standalone yes |
||||
); |
||||
xmlroot |
||||
------------------------------------------------------------------------------------------ |
||||
<?xml version="1.0" standalone="yes"?><gazonk name="val" num="2"><qux>foo</qux></gazonk> |
||||
(1 row) |
||||
|
||||
SELECT xmlserialize(content data as character varying) FROM xmltest; |
||||
data |
||||
-------------------- |
||||
<value>one</value> |
||||
<value>two</value> |
||||
(2 rows) |
||||
|
||||
-- Check mapping SQL identifier to XML name |
||||
SELECT xmlpi(name ":::_xml_abc135.%-&_"); |
||||
xmlpi |
||||
------------------------------------------------- |
||||
<?_x003A_::_x005F_xml_abc135._x0025_-_x0026__?> |
||||
(1 row) |
||||
|
||||
SELECT xmlpi(name "123"); |
||||
xmlpi |
||||
--------------- |
||||
<?_x0031_23?> |
||||
(1 row) |
||||
|
||||
@ -0,0 +1,77 @@ |
||||
CREATE TABLE xmltest ( |
||||
id int, |
||||
data xml |
||||
); |
||||
INSERT INTO xmltest VALUES (1, '<value>one</value>'); |
||||
ERROR: no XML support in this installation |
||||
INSERT INTO xmltest VALUES (2, '<value>two</value>'); |
||||
ERROR: no XML support in this installation |
||||
INSERT INTO xmltest VALUES (3, '<wrong'); |
||||
ERROR: no XML support in this installation |
||||
SELECT * FROM xmltest; |
||||
id | data |
||||
----+------ |
||||
(0 rows) |
||||
|
||||
SELECT xmlcomment('test'); |
||||
ERROR: no XML support in this installation |
||||
SELECT xmlcomment('-test'); |
||||
ERROR: no XML support in this installation |
||||
SELECT xmlcomment('test-'); |
||||
ERROR: no XML support in this installation |
||||
SELECT xmlcomment('--test'); |
||||
ERROR: no XML support in this installation |
||||
SELECT xmlcomment('te st'); |
||||
ERROR: no XML support in this installation |
||||
SELECT xmlconcat(xmlcomment('hello'), |
||||
xmlelement(NAME qux, 'foo'), |
||||
xmlcomment('world')); |
||||
ERROR: no XML support in this installation |
||||
SELECT xmlconcat('hello', 'you'); |
||||
ERROR: no XML support in this installation |
||||
SELECT xmlconcat(1, 2); |
||||
ERROR: argument of XMLCONCAT must be type xml, not type integer |
||||
SELECT xmlconcat('bad', '<syntax'); |
||||
ERROR: no XML support in this installation |
||||
SELECT xmlelement(name element, |
||||
xmlattributes (1 as one, 'deuce' as two), |
||||
'content'); |
||||
ERROR: no XML support in this installation |
||||
SELECT xmlelement(name element, |
||||
xmlattributes ('unnamed and wrong')); |
||||
ERROR: no XML support in this installation |
||||
SELECT xmlelement(name element, xmlelement(name nested, 'stuff')); |
||||
ERROR: no XML support in this installation |
||||
SELECT xmlelement(name employee, xmlforest(name, age, salary as pay)) FROM emp; |
||||
ERROR: no XML support in this installation |
||||
SELECT xmlelement(name wrong, 37); |
||||
ERROR: no XML support in this installation |
||||
SELECT xmlpi(name foo); |
||||
ERROR: no XML support in this installation |
||||
SELECT xmlpi(name xmlstuff); |
||||
ERROR: no XML support in this installation |
||||
SELECT xmlpi(name foo, 'bar'); |
||||
ERROR: no XML support in this installation |
||||
SELECT xmlpi(name foo, 'in?>valid'); |
||||
ERROR: no XML support in this installation |
||||
SELECT xmlroot ( |
||||
xmlelement ( |
||||
name gazonk, |
||||
xmlattributes ( |
||||
'val' AS name, |
||||
1 + 1 AS num |
||||
), |
||||
xmlelement ( |
||||
NAME qux, |
||||
'foo' |
||||
) |
||||
), |
||||
version '1.0', |
||||
standalone yes |
||||
); |
||||
ERROR: no XML support in this installation |
||||
-- Check mapping SQL identifier to XML name |
||||
SELECT xmlpi(name ":::_xml_abc135.%-&_"); |
||||
ERROR: no XML support in this installation |
||||
SELECT xmlpi(name "123"); |
||||
ERROR: no XML support in this installation |
||||
@ -0,0 +1,72 @@ |
||||
CREATE TABLE xmltest ( |
||||
id int, |
||||
data xml |
||||
); |
||||
|
||||
INSERT INTO xmltest VALUES (1, '<value>one</value>'); |
||||
INSERT INTO xmltest VALUES (2, '<value>two</value>'); |
||||
INSERT INTO xmltest VALUES (3, '<wrong'); |
||||
|
||||
SELECT * FROM xmltest; |
||||
|
||||
|
||||
SELECT xmlcomment('test'); |
||||
SELECT xmlcomment('-test'); |
||||
SELECT xmlcomment('test-'); |
||||
SELECT xmlcomment('--test'); |
||||
SELECT xmlcomment('te st'); |
||||
|
||||
|
||||
SELECT xmlconcat(xmlcomment('hello'), |
||||
xmlelement(NAME qux, 'foo'), |
||||
xmlcomment('world')); |
||||
|
||||
SELECT xmlconcat('hello', 'you'); |
||||
SELECT xmlconcat(1, 2); |
||||
SELECT xmlconcat('bad', '<syntax'); |
||||
|
||||
|
||||
SELECT xmlelement(name element, |
||||
xmlattributes (1 as one, 'deuce' as two), |
||||
'content'); |
||||
|
||||
SELECT xmlelement(name element, |
||||
xmlattributes ('unnamed and wrong')); |
||||
|
||||
SELECT xmlelement(name element, xmlelement(name nested, 'stuff')); |
||||
|
||||
SELECT xmlelement(name employee, xmlforest(name, age, salary as pay)) FROM emp; |
||||
|
||||
SELECT xmlelement(name wrong, 37); |
||||
|
||||
|
||||
SELECT xmlpi(name foo); |
||||
SELECT xmlpi(name xmlstuff); |
||||
SELECT xmlpi(name foo, 'bar'); |
||||
SELECT xmlpi(name foo, 'in?>valid'); |
||||
|
||||
|
||||
SELECT xmlroot ( |
||||
xmlelement ( |
||||
name gazonk, |
||||
xmlattributes ( |
||||
'val' AS name, |
||||
1 + 1 AS num |
||||
), |
||||
xmlelement ( |
||||
NAME qux, |
||||
'foo' |
||||
) |
||||
), |
||||
version '1.0', |
||||
standalone yes |
||||
); |
||||
|
||||
|
||||
SELECT xmlserialize(content data as character varying) FROM xmltest; |
||||
|
||||
|
||||
-- Check mapping SQL identifier to XML name |
||||
|
||||
SELECT xmlpi(name ":::_xml_abc135.%-&_"); |
||||
SELECT xmlpi(name "123"); |
||||
Loading…
Reference in new issue