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https://github.com/mozilla/gecko-dev.git
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8ad99dd7fa
It's a sub-class of nsAtom, useful for cases where you know you are dealing exclusively with static atoms. The nice thing about it is that you can use raw nsStaticAtom pointers instead of RefPtr<>. (In fact, the AddRef/Release implementations ensure that we'll crash if we use RefPtr<nsStaticAtom>.) MozReview-Commit-ID: 4Q6QHX5h44V --HG-- extra : rebase_source : e4237f85b4821b684db0ef84d1f9c5e17cdee428
744 lines
23 KiB
C++
744 lines
23 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/ArrayUtils.h"
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#include "mozilla/FloatingPoint.h"
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#include "txExpr.h"
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#include "nsAutoPtr.h"
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#include "txNodeSet.h"
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#include "nsGkAtoms.h"
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#include "txIXPathContext.h"
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#include "nsWhitespaceTokenizer.h"
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#include "txXPathTreeWalker.h"
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#include <math.h>
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#include "txStringUtils.h"
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#include "txXMLUtils.h"
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using namespace mozilla;
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struct txCoreFunctionDescriptor
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{
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int8_t mMinParams;
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int8_t mMaxParams;
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Expr::ResultType mReturnType;
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nsStaticAtom** mName;
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};
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// This must be ordered in the same order as txCoreFunctionCall::eType.
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// If you change one, change the other.
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static const txCoreFunctionDescriptor descriptTable[] =
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{
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{ 1, 1, Expr::NUMBER_RESULT, &nsGkAtoms::count }, // COUNT
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{ 1, 1, Expr::NODESET_RESULT, &nsGkAtoms::id }, // ID
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{ 0, 0, Expr::NUMBER_RESULT, &nsGkAtoms::last }, // LAST
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{ 0, 1, Expr::STRING_RESULT, &nsGkAtoms::localName }, // LOCAL_NAME
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{ 0, 1, Expr::STRING_RESULT, &nsGkAtoms::namespaceUri }, // NAMESPACE_URI
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{ 0, 1, Expr::STRING_RESULT, &nsGkAtoms::name }, // NAME
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{ 0, 0, Expr::NUMBER_RESULT, &nsGkAtoms::position }, // POSITION
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{ 2, -1, Expr::STRING_RESULT, &nsGkAtoms::concat }, // CONCAT
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{ 2, 2, Expr::BOOLEAN_RESULT, &nsGkAtoms::contains }, // CONTAINS
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{ 0, 1, Expr::STRING_RESULT, &nsGkAtoms::normalizeSpace }, // NORMALIZE_SPACE
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{ 2, 2, Expr::BOOLEAN_RESULT, &nsGkAtoms::startsWith }, // STARTS_WITH
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{ 0, 1, Expr::STRING_RESULT, &nsGkAtoms::string }, // STRING
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{ 0, 1, Expr::NUMBER_RESULT, &nsGkAtoms::stringLength }, // STRING_LENGTH
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{ 2, 3, Expr::STRING_RESULT, &nsGkAtoms::substring }, // SUBSTRING
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{ 2, 2, Expr::STRING_RESULT, &nsGkAtoms::substringAfter }, // SUBSTRING_AFTER
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{ 2, 2, Expr::STRING_RESULT, &nsGkAtoms::substringBefore }, // SUBSTRING_BEFORE
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{ 3, 3, Expr::STRING_RESULT, &nsGkAtoms::translate }, // TRANSLATE
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{ 0, 1, Expr::NUMBER_RESULT, &nsGkAtoms::number }, // NUMBER
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{ 1, 1, Expr::NUMBER_RESULT, &nsGkAtoms::round }, // ROUND
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{ 1, 1, Expr::NUMBER_RESULT, &nsGkAtoms::floor }, // FLOOR
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{ 1, 1, Expr::NUMBER_RESULT, &nsGkAtoms::ceiling }, // CEILING
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{ 1, 1, Expr::NUMBER_RESULT, &nsGkAtoms::sum }, // SUM
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{ 1, 1, Expr::BOOLEAN_RESULT, &nsGkAtoms::boolean }, // BOOLEAN
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{ 0, 0, Expr::BOOLEAN_RESULT, &nsGkAtoms::_false }, // _FALSE
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{ 1, 1, Expr::BOOLEAN_RESULT, &nsGkAtoms::lang }, // LANG
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{ 1, 1, Expr::BOOLEAN_RESULT, &nsGkAtoms::_not }, // _NOT
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{ 0, 0, Expr::BOOLEAN_RESULT, &nsGkAtoms::_true } // _TRUE
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};
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/*
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* Evaluates this Expr based on the given context node and processor state
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* @param context the context node for evaluation of this Expr
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* @param ps the ContextState containing the stack information needed
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* for evaluation
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* @return the result of the evaluation
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*/
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nsresult
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txCoreFunctionCall::evaluate(txIEvalContext* aContext, txAExprResult** aResult)
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{
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*aResult = nullptr;
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if (!requireParams(descriptTable[mType].mMinParams,
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descriptTable[mType].mMaxParams,
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aContext)) {
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return NS_ERROR_XPATH_BAD_ARGUMENT_COUNT;
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}
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nsresult rv = NS_OK;
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switch (mType) {
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case COUNT:
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{
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RefPtr<txNodeSet> nodes;
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rv = evaluateToNodeSet(mParams[0], aContext,
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getter_AddRefs(nodes));
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NS_ENSURE_SUCCESS(rv, rv);
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return aContext->recycler()->getNumberResult(nodes->size(),
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aResult);
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}
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case ID:
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{
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RefPtr<txAExprResult> exprResult;
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rv = mParams[0]->evaluate(aContext, getter_AddRefs(exprResult));
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NS_ENSURE_SUCCESS(rv, rv);
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RefPtr<txNodeSet> resultSet;
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rv = aContext->recycler()->getNodeSet(getter_AddRefs(resultSet));
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NS_ENSURE_SUCCESS(rv, rv);
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txXPathTreeWalker walker(aContext->getContextNode());
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if (exprResult->getResultType() == txAExprResult::NODESET) {
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txNodeSet* nodes = static_cast<txNodeSet*>
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(static_cast<txAExprResult*>
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(exprResult));
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int32_t i;
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for (i = 0; i < nodes->size(); ++i) {
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nsAutoString idList;
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txXPathNodeUtils::appendNodeValue(nodes->get(i), idList);
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nsWhitespaceTokenizer tokenizer(idList);
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while (tokenizer.hasMoreTokens()) {
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if (walker.moveToElementById(tokenizer.nextToken())) {
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resultSet->add(walker.getCurrentPosition());
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}
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}
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}
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}
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else {
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nsAutoString idList;
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exprResult->stringValue(idList);
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nsWhitespaceTokenizer tokenizer(idList);
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while (tokenizer.hasMoreTokens()) {
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if (walker.moveToElementById(tokenizer.nextToken())) {
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resultSet->add(walker.getCurrentPosition());
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}
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}
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}
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*aResult = resultSet;
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NS_ADDREF(*aResult);
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return NS_OK;
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}
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case LAST:
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{
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return aContext->recycler()->getNumberResult(aContext->size(),
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aResult);
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}
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case LOCAL_NAME:
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case NAME:
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case NAMESPACE_URI:
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{
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// Check for optional arg
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RefPtr<txNodeSet> nodes;
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if (!mParams.IsEmpty()) {
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rv = evaluateToNodeSet(mParams[0], aContext,
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getter_AddRefs(nodes));
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NS_ENSURE_SUCCESS(rv, rv);
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if (nodes->isEmpty()) {
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aContext->recycler()->getEmptyStringResult(aResult);
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return NS_OK;
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}
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}
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const txXPathNode& node = nodes ? nodes->get(0) :
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aContext->getContextNode();
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switch (mType) {
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case LOCAL_NAME:
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{
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StringResult* strRes = nullptr;
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rv = aContext->recycler()->getStringResult(&strRes);
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NS_ENSURE_SUCCESS(rv, rv);
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*aResult = strRes;
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txXPathNodeUtils::getLocalName(node, strRes->mValue);
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return NS_OK;
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}
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case NAMESPACE_URI:
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{
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StringResult* strRes = nullptr;
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rv = aContext->recycler()->getStringResult(&strRes);
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NS_ENSURE_SUCCESS(rv, rv);
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*aResult = strRes;
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txXPathNodeUtils::getNamespaceURI(node, strRes->mValue);
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return NS_OK;
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}
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case NAME:
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{
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// XXX Namespace: namespaces have a name
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if (txXPathNodeUtils::isAttribute(node) ||
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txXPathNodeUtils::isElement(node) ||
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txXPathNodeUtils::isProcessingInstruction(node)) {
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StringResult* strRes = nullptr;
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rv = aContext->recycler()->getStringResult(&strRes);
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NS_ENSURE_SUCCESS(rv, rv);
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*aResult = strRes;
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txXPathNodeUtils::getNodeName(node, strRes->mValue);
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}
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else {
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aContext->recycler()->getEmptyStringResult(aResult);
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}
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return NS_OK;
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}
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default:
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{
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MOZ_CRASH("Unexpected mType?!");
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}
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}
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MOZ_CRASH("Inner mType switch should have returned!");
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}
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case POSITION:
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{
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return aContext->recycler()->getNumberResult(aContext->position(),
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aResult);
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}
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// String functions
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case CONCAT:
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{
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RefPtr<StringResult> strRes;
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rv = aContext->recycler()->getStringResult(getter_AddRefs(strRes));
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NS_ENSURE_SUCCESS(rv, rv);
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uint32_t i, len = mParams.Length();
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for (i = 0; i < len; ++i) {
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rv = mParams[i]->evaluateToString(aContext, strRes->mValue);
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NS_ENSURE_SUCCESS(rv, rv);
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}
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NS_ADDREF(*aResult = strRes);
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return NS_OK;
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}
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case CONTAINS:
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{
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nsAutoString arg2;
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rv = mParams[1]->evaluateToString(aContext, arg2);
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NS_ENSURE_SUCCESS(rv, rv);
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if (arg2.IsEmpty()) {
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aContext->recycler()->getBoolResult(true, aResult);
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}
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else {
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nsAutoString arg1;
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rv = mParams[0]->evaluateToString(aContext, arg1);
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NS_ENSURE_SUCCESS(rv, rv);
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aContext->recycler()->getBoolResult(FindInReadable(arg2, arg1),
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aResult);
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}
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return NS_OK;
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}
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case NORMALIZE_SPACE:
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{
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nsAutoString resultStr;
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if (!mParams.IsEmpty()) {
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rv = mParams[0]->evaluateToString(aContext, resultStr);
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NS_ENSURE_SUCCESS(rv, rv);
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}
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else {
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txXPathNodeUtils::appendNodeValue(aContext->getContextNode(),
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resultStr);
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}
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RefPtr<StringResult> strRes;
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rv = aContext->recycler()->getStringResult(getter_AddRefs(strRes));
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NS_ENSURE_SUCCESS(rv, rv);
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bool addSpace = false;
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bool first = true;
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strRes->mValue.SetCapacity(resultStr.Length());
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char16_t c;
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uint32_t src;
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for (src = 0; src < resultStr.Length(); src++) {
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c = resultStr.CharAt(src);
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if (XMLUtils::isWhitespace(c)) {
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addSpace = true;
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}
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else {
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if (addSpace && !first)
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strRes->mValue.Append(char16_t(' '));
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strRes->mValue.Append(c);
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addSpace = false;
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first = false;
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}
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}
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*aResult = strRes;
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NS_ADDREF(*aResult);
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return NS_OK;
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}
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case STARTS_WITH:
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{
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nsAutoString arg2;
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rv = mParams[1]->evaluateToString(aContext, arg2);
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NS_ENSURE_SUCCESS(rv, rv);
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bool result = false;
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if (arg2.IsEmpty()) {
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result = true;
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}
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else {
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nsAutoString arg1;
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rv = mParams[0]->evaluateToString(aContext, arg1);
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NS_ENSURE_SUCCESS(rv, rv);
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result = StringBeginsWith(arg1, arg2);
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}
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aContext->recycler()->getBoolResult(result, aResult);
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return NS_OK;
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}
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case STRING:
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{
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RefPtr<StringResult> strRes;
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rv = aContext->recycler()->getStringResult(getter_AddRefs(strRes));
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NS_ENSURE_SUCCESS(rv, rv);
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if (!mParams.IsEmpty()) {
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rv = mParams[0]->evaluateToString(aContext, strRes->mValue);
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NS_ENSURE_SUCCESS(rv, rv);
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}
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else {
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txXPathNodeUtils::appendNodeValue(aContext->getContextNode(),
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strRes->mValue);
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}
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NS_ADDREF(*aResult = strRes);
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return NS_OK;
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}
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case STRING_LENGTH:
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{
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nsAutoString resultStr;
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if (!mParams.IsEmpty()) {
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rv = mParams[0]->evaluateToString(aContext, resultStr);
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NS_ENSURE_SUCCESS(rv, rv);
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}
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else {
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txXPathNodeUtils::appendNodeValue(aContext->getContextNode(),
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resultStr);
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}
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rv = aContext->recycler()->getNumberResult(resultStr.Length(),
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aResult);
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NS_ENSURE_SUCCESS(rv, rv);
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return NS_OK;
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}
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case SUBSTRING:
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{
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nsAutoString src;
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rv = mParams[0]->evaluateToString(aContext, src);
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NS_ENSURE_SUCCESS(rv, rv);
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double start;
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rv = evaluateToNumber(mParams[1], aContext, &start);
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NS_ENSURE_SUCCESS(rv, rv);
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// check for NaN or +/-Inf
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if (mozilla::IsNaN(start) ||
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mozilla::IsInfinite(start) ||
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start >= src.Length() + 0.5) {
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aContext->recycler()->getEmptyStringResult(aResult);
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return NS_OK;
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}
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start = floor(start + 0.5) - 1;
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double end;
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if (mParams.Length() == 3) {
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rv = evaluateToNumber(mParams[2], aContext, &end);
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NS_ENSURE_SUCCESS(rv, rv);
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end += start;
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if (mozilla::IsNaN(end) || end < 0) {
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aContext->recycler()->getEmptyStringResult(aResult);
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return NS_OK;
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}
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if (end > src.Length())
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end = src.Length();
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else
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end = floor(end + 0.5);
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}
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else {
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end = src.Length();
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}
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if (start < 0)
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start = 0;
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if (start > end) {
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aContext->recycler()->getEmptyStringResult(aResult);
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return NS_OK;
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}
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return aContext->recycler()->getStringResult(
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Substring(src, (uint32_t)start, (uint32_t)(end - start)),
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aResult);
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}
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case SUBSTRING_AFTER:
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{
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nsAutoString arg1;
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rv = mParams[0]->evaluateToString(aContext, arg1);
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NS_ENSURE_SUCCESS(rv, rv);
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nsAutoString arg2;
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rv = mParams[1]->evaluateToString(aContext, arg2);
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NS_ENSURE_SUCCESS(rv, rv);
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if (arg2.IsEmpty()) {
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return aContext->recycler()->getStringResult(arg1, aResult);
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}
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int32_t idx = arg1.Find(arg2);
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if (idx == kNotFound) {
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aContext->recycler()->getEmptyStringResult(aResult);
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return NS_OK;
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}
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const nsAString& result = Substring(arg1, idx + arg2.Length());
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return aContext->recycler()->getStringResult(result, aResult);
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}
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case SUBSTRING_BEFORE:
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{
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nsAutoString arg2;
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rv = mParams[1]->evaluateToString(aContext, arg2);
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NS_ENSURE_SUCCESS(rv, rv);
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if (arg2.IsEmpty()) {
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aContext->recycler()->getEmptyStringResult(aResult);
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return NS_OK;
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}
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nsAutoString arg1;
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rv = mParams[0]->evaluateToString(aContext, arg1);
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NS_ENSURE_SUCCESS(rv, rv);
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int32_t idx = arg1.Find(arg2);
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if (idx == kNotFound) {
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aContext->recycler()->getEmptyStringResult(aResult);
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return NS_OK;
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}
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return aContext->recycler()->getStringResult(StringHead(arg1, idx),
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aResult);
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}
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case TRANSLATE:
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{
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nsAutoString src;
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rv = mParams[0]->evaluateToString(aContext, src);
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NS_ENSURE_SUCCESS(rv, rv);
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if (src.IsEmpty()) {
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aContext->recycler()->getEmptyStringResult(aResult);
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return NS_OK;
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}
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RefPtr<StringResult> strRes;
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rv = aContext->recycler()->getStringResult(getter_AddRefs(strRes));
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NS_ENSURE_SUCCESS(rv, rv);
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strRes->mValue.SetCapacity(src.Length());
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nsAutoString oldChars, newChars;
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rv = mParams[1]->evaluateToString(aContext, oldChars);
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NS_ENSURE_SUCCESS(rv, rv);
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rv = mParams[2]->evaluateToString(aContext, newChars);
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NS_ENSURE_SUCCESS(rv, rv);
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uint32_t i;
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int32_t newCharsLength = (int32_t)newChars.Length();
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for (i = 0; i < src.Length(); i++) {
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int32_t idx = oldChars.FindChar(src.CharAt(i));
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if (idx != kNotFound) {
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if (idx < newCharsLength)
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strRes->mValue.Append(newChars.CharAt((uint32_t)idx));
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}
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else {
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strRes->mValue.Append(src.CharAt(i));
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}
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}
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NS_ADDREF(*aResult = strRes);
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return NS_OK;
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}
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// Number functions
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case NUMBER:
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{
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double res;
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if (!mParams.IsEmpty()) {
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rv = evaluateToNumber(mParams[0], aContext, &res);
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NS_ENSURE_SUCCESS(rv, rv);
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}
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else {
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|
nsAutoString resultStr;
|
|
txXPathNodeUtils::appendNodeValue(aContext->getContextNode(),
|
|
resultStr);
|
|
res = txDouble::toDouble(resultStr);
|
|
}
|
|
return aContext->recycler()->getNumberResult(res, aResult);
|
|
}
|
|
case ROUND:
|
|
{
|
|
double dbl;
|
|
rv = evaluateToNumber(mParams[0], aContext, &dbl);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
if (mozilla::IsFinite(dbl)) {
|
|
if (mozilla::IsNegative(dbl) && dbl >= -0.5) {
|
|
dbl *= 0;
|
|
}
|
|
else {
|
|
dbl = floor(dbl + 0.5);
|
|
}
|
|
}
|
|
|
|
return aContext->recycler()->getNumberResult(dbl, aResult);
|
|
}
|
|
case FLOOR:
|
|
{
|
|
double dbl;
|
|
rv = evaluateToNumber(mParams[0], aContext, &dbl);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
if (mozilla::IsFinite(dbl) && !mozilla::IsNegativeZero(dbl))
|
|
dbl = floor(dbl);
|
|
|
|
return aContext->recycler()->getNumberResult(dbl, aResult);
|
|
}
|
|
case CEILING:
|
|
{
|
|
double dbl;
|
|
rv = evaluateToNumber(mParams[0], aContext, &dbl);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
if (mozilla::IsFinite(dbl)) {
|
|
if (mozilla::IsNegative(dbl) && dbl > -1)
|
|
dbl *= 0;
|
|
else
|
|
dbl = ceil(dbl);
|
|
}
|
|
|
|
return aContext->recycler()->getNumberResult(dbl, aResult);
|
|
}
|
|
case SUM:
|
|
{
|
|
RefPtr<txNodeSet> nodes;
|
|
nsresult rv = evaluateToNodeSet(mParams[0], aContext,
|
|
getter_AddRefs(nodes));
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
double res = 0;
|
|
int32_t i;
|
|
for (i = 0; i < nodes->size(); ++i) {
|
|
nsAutoString resultStr;
|
|
txXPathNodeUtils::appendNodeValue(nodes->get(i), resultStr);
|
|
res += txDouble::toDouble(resultStr);
|
|
}
|
|
return aContext->recycler()->getNumberResult(res, aResult);
|
|
}
|
|
|
|
// Boolean functions
|
|
|
|
case BOOLEAN:
|
|
{
|
|
bool result;
|
|
nsresult rv = mParams[0]->evaluateToBool(aContext, result);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
aContext->recycler()->getBoolResult(result, aResult);
|
|
|
|
return NS_OK;
|
|
}
|
|
case _FALSE:
|
|
{
|
|
aContext->recycler()->getBoolResult(false, aResult);
|
|
|
|
return NS_OK;
|
|
}
|
|
case LANG:
|
|
{
|
|
txXPathTreeWalker walker(aContext->getContextNode());
|
|
|
|
nsAutoString lang;
|
|
bool found;
|
|
do {
|
|
found = walker.getAttr(nsGkAtoms::lang, kNameSpaceID_XML,
|
|
lang);
|
|
} while (!found && walker.moveToParent());
|
|
|
|
if (!found) {
|
|
aContext->recycler()->getBoolResult(false, aResult);
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
nsAutoString arg;
|
|
rv = mParams[0]->evaluateToString(aContext, arg);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
bool result =
|
|
StringBeginsWith(lang, arg,
|
|
txCaseInsensitiveStringComparator()) &&
|
|
(lang.Length() == arg.Length() ||
|
|
lang.CharAt(arg.Length()) == '-');
|
|
|
|
aContext->recycler()->getBoolResult(result, aResult);
|
|
|
|
return NS_OK;
|
|
}
|
|
case _NOT:
|
|
{
|
|
bool result;
|
|
rv = mParams[0]->evaluateToBool(aContext, result);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
aContext->recycler()->getBoolResult(!result, aResult);
|
|
|
|
return NS_OK;
|
|
}
|
|
case _TRUE:
|
|
{
|
|
aContext->recycler()->getBoolResult(true, aResult);
|
|
|
|
return NS_OK;
|
|
}
|
|
}
|
|
|
|
aContext->receiveError(NS_LITERAL_STRING("Internal error"),
|
|
NS_ERROR_UNEXPECTED);
|
|
return NS_ERROR_UNEXPECTED;
|
|
}
|
|
|
|
Expr::ResultType
|
|
txCoreFunctionCall::getReturnType()
|
|
{
|
|
return descriptTable[mType].mReturnType;
|
|
}
|
|
|
|
bool
|
|
txCoreFunctionCall::isSensitiveTo(ContextSensitivity aContext)
|
|
{
|
|
switch (mType) {
|
|
case COUNT:
|
|
case CONCAT:
|
|
case CONTAINS:
|
|
case STARTS_WITH:
|
|
case SUBSTRING:
|
|
case SUBSTRING_AFTER:
|
|
case SUBSTRING_BEFORE:
|
|
case TRANSLATE:
|
|
case ROUND:
|
|
case FLOOR:
|
|
case CEILING:
|
|
case SUM:
|
|
case BOOLEAN:
|
|
case _NOT:
|
|
case _FALSE:
|
|
case _TRUE:
|
|
{
|
|
return argsSensitiveTo(aContext);
|
|
}
|
|
case ID:
|
|
{
|
|
return (aContext & NODE_CONTEXT) ||
|
|
argsSensitiveTo(aContext);
|
|
}
|
|
case LAST:
|
|
{
|
|
return !!(aContext & SIZE_CONTEXT);
|
|
}
|
|
case LOCAL_NAME:
|
|
case NAME:
|
|
case NAMESPACE_URI:
|
|
case NORMALIZE_SPACE:
|
|
case STRING:
|
|
case STRING_LENGTH:
|
|
case NUMBER:
|
|
{
|
|
if (mParams.IsEmpty()) {
|
|
return !!(aContext & NODE_CONTEXT);
|
|
}
|
|
return argsSensitiveTo(aContext);
|
|
}
|
|
case POSITION:
|
|
{
|
|
return !!(aContext & POSITION_CONTEXT);
|
|
}
|
|
case LANG:
|
|
{
|
|
return (aContext & NODE_CONTEXT) ||
|
|
argsSensitiveTo(aContext);
|
|
}
|
|
}
|
|
|
|
NS_NOTREACHED("how'd we get here?");
|
|
return true;
|
|
}
|
|
|
|
// static
|
|
bool
|
|
txCoreFunctionCall::getTypeFromAtom(nsAtom* aName, eType& aType)
|
|
{
|
|
uint32_t i;
|
|
for (i = 0; i < ArrayLength(descriptTable); ++i) {
|
|
if (aName == *descriptTable[i].mName) {
|
|
aType = static_cast<eType>(i);
|
|
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
#ifdef TX_TO_STRING
|
|
nsresult
|
|
txCoreFunctionCall::getNameAtom(nsAtom** aAtom)
|
|
{
|
|
NS_ADDREF(*aAtom = *descriptTable[mType].mName);
|
|
return NS_OK;
|
|
}
|
|
#endif
|