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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "txPatternParser.h"
#include "txExprLexer.h"
#include "nsGkAtoms.h"
#include "nsError.h"
#include "txStringUtils.h"
#include "txXSLTPatterns.h"
#include "txStylesheetCompiler.h"
#include "txPatternOptimizer.h"
#include "mozilla/UniquePtrExtensions.h"
using mozilla::UniquePtr;
nsresult txPatternParser::createPattern(const nsString& aPattern,
txIParseContext* aContext,
txPattern** aResult) {
txExprLexer lexer;
nsresult rv = lexer.parse(aPattern);
if (NS_FAILED(rv)) {
// XXX error report parsing error
return rv;
}
UniquePtr<txPattern> pattern;
rv = createUnionPattern(lexer, aContext, *getter_Transfers(pattern));
if (NS_FAILED(rv)) {
// XXX error report parsing error
return rv;
}
txPatternOptimizer optimizer;
txPattern* newPattern = nullptr;
optimizer.optimize(pattern.get(), &newPattern);
*aResult = newPattern ? newPattern : pattern.release();
return NS_OK;
}
nsresult txPatternParser::createUnionPattern(txExprLexer& aLexer,
txIParseContext* aContext,
txPattern*& aPattern) {
nsresult rv = NS_OK;
txPattern* locPath = 0;
rv = createLocPathPattern(aLexer, aContext, locPath);
if (NS_FAILED(rv)) return rv;
Token::Type type = aLexer.peek()->mType;
if (type == Token::END) {
aPattern = locPath;
return NS_OK;
}
if (type != Token::UNION_OP) {
delete locPath;
return NS_ERROR_XPATH_PARSE_FAILURE;
}
txUnionPattern* unionPattern = new txUnionPattern();
unionPattern->addPattern(locPath);
aLexer.nextToken();
do {
rv = createLocPathPattern(aLexer, aContext, locPath);
if (NS_FAILED(rv)) {
delete unionPattern;
return rv;
}
unionPattern->addPattern(locPath);
type = aLexer.nextToken()->mType;
} while (type == Token::UNION_OP);
if (type != Token::END) {
delete unionPattern;
return NS_ERROR_XPATH_PARSE_FAILURE;
}
aPattern = unionPattern;
return NS_OK;
}
nsresult txPatternParser::createLocPathPattern(txExprLexer& aLexer,
txIParseContext* aContext,
txPattern*& aPattern) {
nsresult rv = NS_OK;
bool isChild = true;
bool isAbsolute = false;
txPattern* stepPattern = 0;
txLocPathPattern* pathPattern = 0;
Token::Type type = aLexer.peek()->mType;
switch (type) {
case Token::ANCESTOR_OP:
isChild = false;
isAbsolute = true;
aLexer.nextToken();
break;
case Token::PARENT_OP:
aLexer.nextToken();
isAbsolute = true;
if (aLexer.peek()->mType == Token::END ||
aLexer.peek()->mType == Token::UNION_OP) {
aPattern = new txRootPattern();
return NS_OK;
}
break;
case Token::FUNCTION_NAME_AND_PAREN:
// id(Literal) or key(Literal, Literal)
{
RefPtr<nsAtom> nameAtom = NS_Atomize(aLexer.nextToken()->Value());
if (nameAtom == nsGkAtoms::id) {
rv = createIdPattern(aLexer, stepPattern);
} else if (nameAtom == nsGkAtoms::key) {
rv = createKeyPattern(aLexer, aContext, stepPattern);
}
if (NS_FAILED(rv)) return rv;
}
break;
default:
break;
}
if (!stepPattern) {
rv = createStepPattern(aLexer, aContext, stepPattern);
if (NS_FAILED(rv)) return rv;
}
type = aLexer.peek()->mType;
if (!isAbsolute && type != Token::PARENT_OP && type != Token::ANCESTOR_OP) {
aPattern = stepPattern;
return NS_OK;
}
pathPattern = new txLocPathPattern();
if (isAbsolute) {
txRootPattern* root = new txRootPattern();
#ifdef TX_TO_STRING
root->setSerialize(false);
#endif
pathPattern->addStep(root, isChild);
}
pathPattern->addStep(stepPattern, isChild);
stepPattern = 0; // stepPattern is part of pathPattern now
while (type == Token::PARENT_OP || type == Token::ANCESTOR_OP) {
isChild = type == Token::PARENT_OP;
aLexer.nextToken();
rv = createStepPattern(aLexer, aContext, stepPattern);
if (NS_FAILED(rv)) {
delete pathPattern;
return rv;
}
pathPattern->addStep(stepPattern, isChild);
stepPattern = 0; // stepPattern is part of pathPattern now
type = aLexer.peek()->mType;
}
aPattern = pathPattern;
return rv;
}
nsresult txPatternParser::createIdPattern(txExprLexer& aLexer,
txPattern*& aPattern) {
// check for '(' Literal ')'
if (aLexer.peek()->mType != Token::LITERAL)
return NS_ERROR_XPATH_PARSE_FAILURE;
const nsDependentSubstring& value = aLexer.nextToken()->Value();
if (aLexer.nextToken()->mType != Token::R_PAREN)
return NS_ERROR_XPATH_PARSE_FAILURE;
aPattern = new txIdPattern(value);
return NS_OK;
}
nsresult txPatternParser::createKeyPattern(txExprLexer& aLexer,
txIParseContext* aContext,
txPattern*& aPattern) {
// check for '(' Literal, Literal ')'
if (aLexer.peek()->mType != Token::LITERAL)
return NS_ERROR_XPATH_PARSE_FAILURE;
const nsDependentSubstring& key = aLexer.nextToken()->Value();
if (aLexer.nextToken()->mType != Token::COMMA &&
aLexer.peek()->mType != Token::LITERAL)
return NS_ERROR_XPATH_PARSE_FAILURE;
const nsDependentSubstring& value = aLexer.nextToken()->Value();
if (aLexer.nextToken()->mType != Token::R_PAREN)
return NS_ERROR_XPATH_PARSE_FAILURE;
if (!aContext->allowed(txIParseContext::KEY_FUNCTION))
return NS_ERROR_XSLT_CALL_TO_KEY_NOT_ALLOWED;
const char16_t* colon;
if (!XMLUtils::isValidQName(key, &colon)) {
return NS_ERROR_XPATH_PARSE_FAILURE;
}
RefPtr<nsAtom> prefix, localName;
int32_t namespaceID;
nsresult rv = resolveQName(key, getter_AddRefs(prefix), aContext,
getter_AddRefs(localName), namespaceID);
if (NS_FAILED(rv)) return rv;
aPattern = new txKeyPattern(prefix, localName, namespaceID, value);
return NS_OK;
}
nsresult txPatternParser::createStepPattern(txExprLexer& aLexer,
txIParseContext* aContext,
txPattern*& aPattern) {
nsresult rv = NS_OK;
bool isAttr = false;
Token* tok = aLexer.peek();
if (tok->mType == Token::AXIS_IDENTIFIER) {
if (TX_StringEqualsAtom(tok->Value(), nsGkAtoms::attribute)) {
isAttr = true;
} else if (!TX_StringEqualsAtom(tok->Value(), nsGkAtoms::child)) {
// all done already for CHILD_AXIS, for all others
// XXX report unexpected axis error
return NS_ERROR_XPATH_PARSE_FAILURE;
}
aLexer.nextToken();
} else if (tok->mType == Token::AT_SIGN) {
aLexer.nextToken();
isAttr = true;
}
txNodeTest* nodeTest;
if (aLexer.peek()->mType == Token::CNAME) {
tok = aLexer.nextToken();
// resolve QName
RefPtr<nsAtom> prefix, lName;
int32_t nspace;
rv = resolveQName(tok->Value(), getter_AddRefs(prefix), aContext,
getter_AddRefs(lName), nspace, true);
if (NS_FAILED(rv)) {
// XXX error report namespace resolve failed
return rv;
}
uint16_t nodeType = isAttr ? (uint16_t)txXPathNodeType::ATTRIBUTE_NODE
: (uint16_t)txXPathNodeType::ELEMENT_NODE;
nodeTest = new txNameTest(prefix, lName, nspace, nodeType);
} else {
rv = createNodeTypeTest(aLexer, &nodeTest);
NS_ENSURE_SUCCESS(rv, rv);
}
UniquePtr<txStepPattern> step(new txStepPattern(nodeTest, isAttr));
rv = parsePredicates(step.get(), aLexer, aContext);
NS_ENSURE_SUCCESS(rv, rv);
aPattern = step.release();
return NS_OK;
}
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