зеркало из https://github.com/mozilla/gecko-dev.git
134 строки
3.5 KiB
C++
134 строки
3.5 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 "txExpr.h"
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#include "nsIAtom.h"
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#include "txIXPathContext.h"
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#include "txNodeSet.h"
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/**
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* This class represents a FunctionCall as defined by the XSL Working Draft
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**/
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//------------------/
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//- Public Methods -/
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//------------------/
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/*
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* Evaluates the given Expression and converts its result to a number.
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*/
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// static
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nsresult
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FunctionCall::evaluateToNumber(Expr* aExpr, txIEvalContext* aContext,
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double* aResult)
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{
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NS_ASSERTION(aExpr, "missing expression");
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nsRefPtr<txAExprResult> exprResult;
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nsresult rv = aExpr->evaluate(aContext, getter_AddRefs(exprResult));
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NS_ENSURE_SUCCESS(rv, rv);
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*aResult = exprResult->numberValue();
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return NS_OK;
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}
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/*
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* Evaluates the given Expression and converts its result to a NodeSet.
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* If the result is not a NodeSet nullptr is returned.
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*/
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nsresult
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FunctionCall::evaluateToNodeSet(Expr* aExpr, txIEvalContext* aContext,
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txNodeSet** aResult)
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{
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NS_ASSERTION(aExpr, "Missing expression to evaluate");
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*aResult = nullptr;
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nsRefPtr<txAExprResult> exprRes;
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nsresult rv = aExpr->evaluate(aContext, getter_AddRefs(exprRes));
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NS_ENSURE_SUCCESS(rv, rv);
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if (exprRes->getResultType() != txAExprResult::NODESET) {
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aContext->receiveError(NS_LITERAL_STRING("NodeSet expected as argument"), NS_ERROR_XSLT_NODESET_EXPECTED);
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return NS_ERROR_XSLT_NODESET_EXPECTED;
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}
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*aResult =
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static_cast<txNodeSet*>(static_cast<txAExprResult*>(exprRes));
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NS_ADDREF(*aResult);
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return NS_OK;
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}
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bool FunctionCall::requireParams(int32_t aParamCountMin,
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int32_t aParamCountMax,
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txIEvalContext* aContext)
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{
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int32_t argc = mParams.Length();
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if (argc < aParamCountMin ||
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(aParamCountMax > -1 && argc > aParamCountMax)) {
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nsAutoString err(NS_LITERAL_STRING("invalid number of parameters for function"));
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#ifdef TX_TO_STRING
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err.AppendLiteral(": ");
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toString(err);
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#endif
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aContext->receiveError(err, NS_ERROR_XPATH_INVALID_ARG);
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return false;
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}
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return true;
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}
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Expr*
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FunctionCall::getSubExprAt(uint32_t aPos)
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{
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return mParams.SafeElementAt(aPos);
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}
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void
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FunctionCall::setSubExprAt(uint32_t aPos, Expr* aExpr)
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{
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NS_ASSERTION(aPos < mParams.Length(),
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"setting bad subexpression index");
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mParams[aPos] = aExpr;
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}
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bool
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FunctionCall::argsSensitiveTo(ContextSensitivity aContext)
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{
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uint32_t i, len = mParams.Length();
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for (i = 0; i < len; ++i) {
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if (mParams[i]->isSensitiveTo(aContext)) {
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return true;
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}
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}
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return false;
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}
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#ifdef TX_TO_STRING
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void
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FunctionCall::toString(nsAString& aDest)
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{
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nsCOMPtr<nsIAtom> functionNameAtom;
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if (NS_FAILED(getNameAtom(getter_AddRefs(functionNameAtom)))) {
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NS_ERROR("Can't get function name.");
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return;
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}
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aDest.Append(nsDependentAtomString(functionNameAtom) +
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NS_LITERAL_STRING("("));
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for (uint32_t i = 0; i < mParams.Length(); ++i) {
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if (i != 0) {
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aDest.Append(char16_t(','));
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}
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mParams[i]->toString(aDest);
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}
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aDest.Append(char16_t(')'));
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}
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#endif
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