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main: introduce experimental libxml2 based xpath metaparser
TODO: qualified-tags Signed-off-by: Masatake YAMATO <yamato@redhat.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,183 @@ | ||
| /* | ||
| * Copyright (c) 2015, Masatake YAMATO | ||
| * Copyright (c) 2015, Red Hat, Inc. | ||
| * | ||
| * This source code is released for free distribution under the terms of the | ||
| * GNU General Public License version 2 or (at your option) any later version. | ||
| * | ||
| * This module contains functions for applying regular expression matching. | ||
| * | ||
| * The code for utilizing the Gnu regex package with regards to processing the | ||
| * regex option and checking for regex matches was adapted from routines in | ||
| * Gnu etags. | ||
| */ | ||
|
|
||
| #include "general.h" /* must always come first */ | ||
| #include "debug.h" | ||
| #include "entry.h" | ||
| #include "options.h" | ||
| #include "parse.h" | ||
| #include "read.h" | ||
| #include "routines.h" | ||
| #include "xtag.h" | ||
|
|
||
| #ifdef HAVE_LIBXML | ||
| #include <libxml/xpath.h> | ||
| #include <libxml/tree.h> | ||
|
|
||
| static void simpleXpathMakeTag (xmlNode *node, | ||
| const tagXpathMakeTagSpec *spec, | ||
| const kindOption* const kinds, | ||
| void *userData) | ||
| { | ||
| tagEntryInfo tag; | ||
| xmlChar* str; | ||
| const kindOption *kind; | ||
|
|
||
| str = xmlNodeGetContent(node); | ||
| if (str == NULL) | ||
| return; | ||
|
|
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| kind = kinds + spec->kind; | ||
|
|
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| if (spec->role == ROLE_INDEX_DEFINITION) | ||
| initTagEntry (&tag, (char *)str, kind); | ||
| else if (isXtagEnabled(XTAG_REFERENCE_TAGS)) | ||
| initRefTagEntry (&tag, (char *)str, | ||
| kind, | ||
| spec->role); | ||
| else | ||
| goto out; | ||
|
|
||
|
|
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| tag.lineNumber = xmlGetLineNo (node); | ||
| tag.filePosition = getInputFilePositionForLine (tag.lineNumber); | ||
|
|
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| if (spec->make) | ||
| spec->make (node, spec, &tag, userData); | ||
| else | ||
| makeTagEntry (&tag); | ||
|
|
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| out: | ||
| xmlFree (str); | ||
| } | ||
|
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| extern void addTagXpath (const langType language, tagXpathTable *xpathTable) | ||
| { | ||
| Assert (xpathTable->xpath); | ||
| Assert (!xpathTable->xpathCompiled); | ||
|
|
||
| verbose ("compile a xpath expression: %s\n", (xmlChar *)xpathTable->xpath); | ||
| xpathTable->xpathCompiled = xmlXPathCompile ((xmlChar *)xpathTable->xpath); | ||
| if (!xpathTable->xpathCompiled) | ||
| error (WARNING, "Failed to compile the Xpath expression: %s", xpathTable->xpath); | ||
| } | ||
|
|
||
| static void findXMLTagsCore (xmlXPathContext *ctx, xmlNode *root, | ||
| const tagXpathTableTable *xpathTableTable, | ||
| const kindOption* const kinds,void *userData) | ||
| { | ||
| unsigned int i, j; | ||
| xmlNode * node; | ||
|
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| Assert (root); | ||
| Assert (xpathTableTable); | ||
|
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| for (i = 0; i < xpathTableTable->count; ++i) | ||
| { | ||
| xmlXPathObject *object; | ||
| xmlNodeSet *set; | ||
| const tagXpathTable *elt = xpathTableTable->table + i; | ||
|
|
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| if (! elt->xpathCompiled) | ||
| continue; | ||
|
|
||
| #if 0 | ||
| /* Older version of libxml2 doesn't have xmlXPathSetContextNode. */ | ||
| if (xmlXPathSetContextNode (root, ctx) != 0) | ||
| { | ||
| error (WARNING, "Failed to set node to XpathContext"); | ||
| return; | ||
| } | ||
| #else | ||
| ctx->node = root; | ||
| #endif | ||
|
|
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| object = xmlXPathCompiledEval (elt->xpathCompiled, ctx); | ||
| if (!object) | ||
| continue; | ||
|
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| set = object->nodesetval; | ||
|
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| if (set) | ||
| { | ||
| for (j = 0; j < set->nodeNr; ++j) | ||
| { | ||
| node = set->nodeTab[j]; | ||
| if (elt->specType == LXPATH_TABLE_DO_MAKE) | ||
| simpleXpathMakeTag (node, &(elt->makeTagSpec), kinds, userData); | ||
| else | ||
| elt->recurSpec.enter (node, &(elt->recurSpec), ctx, userData); | ||
| } | ||
| } | ||
| xmlXPathFreeObject (object); | ||
| } | ||
| } | ||
|
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| extern void findXMLTags (xmlXPathContext *ctx, xmlNode *root, | ||
| const tagXpathTableTable *xpathTableTable, | ||
| const kindOption* const kinds,void *userData) | ||
| { | ||
| boolean usedAsEnterPoint = FALSE; | ||
| xmlDocPtr doc = NULL; | ||
|
|
||
| if (ctx == NULL) | ||
| { | ||
| usedAsEnterPoint = TRUE; | ||
|
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| findRegexTags (); | ||
| doc = xmlParseFile(getInputFileName()); | ||
| if (doc == NULL) | ||
| { | ||
| verbose ("could not parse %s as a XML file\n", getInputFileName()); | ||
| return; | ||
| } | ||
|
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| ctx = xmlXPathNewContext (doc); | ||
| if (ctx == NULL) | ||
| error (FATAL, "failed to make a new xpath context for %s", getInputFileName()); | ||
|
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| root = xmlDocGetRootElement(doc); | ||
| if (root == NULL) | ||
| { | ||
| verbose ("could not get the root node for %s\n", getInputFileName()); | ||
| goto out; | ||
| } | ||
| } | ||
|
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| findXMLTagsCore (ctx, root, xpathTableTable, kinds, userData); | ||
|
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| out: | ||
| if (usedAsEnterPoint) | ||
| { | ||
| xmlXPathFreeContext (ctx); | ||
| xmlFreeDoc (doc); | ||
| } | ||
| } | ||
|
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| #else | ||
|
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| extern void addTagXpath (const langType language, tagXpathTable *xpathTable) | ||
| { | ||
| xpathTable->xpathCompiled = NULL; | ||
| } | ||
|
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| extern void findXMLTags (xmlXPathContext *ctx, xmlNode *root, | ||
| const tagXpathTableTable *xpathTableTable, | ||
| const kindOption* const kinds, void *userData) | ||
| { | ||
| } | ||
|
|
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| #endif | ||
|
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||
| /* vi:set tabstop=4 shiftwidth=4: */ |
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