зеркало из https://github.com/mozilla/pjs.git
127 строки
3.6 KiB
C++
127 строки
3.6 KiB
C++
/*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is XSL:P XSLT processor.
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*
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* The Initial Developer of the Original Code is Keith Visco.
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* Portions created by Keith Visco are Copyright (C) 1999, 2000 Keith Visco.
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* All Rights Reserved.
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*
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* Contributor(s):
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* Keith Visco, kvisco@ziplink.net
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* -- original author.
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*
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* $Id: ExtensionFunctionCall.cpp,v 1.1 2000-04-19 10:35:59 kvisco%ziplink.net Exp $
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*/
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#include "FunctionLib.h"
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const String ExtensionFunctionCall::UNDEFINED_FUNCTION = "Undefined Function: ";
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/**
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* Creates an ExtensionFunctionCall with the given function name.
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* @param name the name of the extension function which to invoke
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**/
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ExtensionFunctionCall::ExtensionFunctionCall(const String& name) : FunctionCall(name)
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{
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this->fname = name;
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this->fnCall = 0;
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} //-- ExtensionFunctionCall
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/**
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* Deletes an instance of ExtensionFunctioncall
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**/
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ExtensionFunctionCall::~ExtensionFunctionCall() {
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delete fnCall;
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} //-- ~ExtensionFunctionCall
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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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ExprResult* ExtensionFunctionCall::evaluate(Node* context, ContextState* cs) {
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//-- check for existing function call resolution
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if (!fnCall) {
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fnCall = cs->resolveFunctionCall(fname);
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if (!fnCall) {
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String err(UNDEFINED_FUNCTION);
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err.append(fname);
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return new StringResult(err);
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}
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//copy parameters
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ListIterator* iter = params.iterator();
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Expr* param = 0;
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while (iter->hasNext()) {
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fnCall->addParam( new ExprWrapper( (Expr*) iter->next() ) );
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}
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delete iter;
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}
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//-- delegate
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return fnCall->evaluate(context, cs);
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} //-- evaluate
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//---------------------------------/
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//- Implementation of ExprWrapper -/
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//---------------------------------/
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/**
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* Creates a new ExprWrapper for the given Expr
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**/
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ExprWrapper::ExprWrapper(Expr* expr) {
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this->expr = expr;
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}
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/**
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* Destructor for ExprWrapper
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**/
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ExprWrapper::~ExprWrapper() {
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//-- DO NOTHING!
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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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ExprResult* ExprWrapper::evaluate(Node* context, ContextState* cs) {
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//-- just delegate
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if (!expr) return 0; // <-- hopefully this will never happen
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return expr->evaluate(context, cs);
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} //-- evaluate
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/**
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* Returns the String representation of this Expr.
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* @param dest the String to use when creating the String
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* representation. The String representation will be appended to
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* any data in the destination String, to allow cascading calls to
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* other #toString() methods for Expressions.
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* @return the String representation of this Expr.
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**/
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void ExprWrapper::toString(String& str) {
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//-- just delegate
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if (expr) expr->toString(str);
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} //-- toString
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