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319 lines
10 KiB
C++
319 lines
10 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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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 TransforMiiX XSLT processor.
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*
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* The Initial Developer of the Original Code is The MITRE Corporation.
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* Portions created by MITRE are Copyright (C) 1999 The MITRE Corporation.
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*
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* Portions created by Keith Visco as a Non MITRE employee,
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* (C) 1999 Keith Visco. 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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*/
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/**
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* StringFunctionCall
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* A representation of the XPath String funtions
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**/
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#include "ExprResult.h"
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#include "FunctionLib.h"
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#include "txAtoms.h"
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#include "txIXPathContext.h"
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#include "XMLDOMUtils.h"
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#include "XMLUtils.h"
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#include <math.h>
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/**
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* Creates a StringFunctionCall of the given type
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**/
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StringFunctionCall::StringFunctionCall(StringFunctions aType) : mType(aType)
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{
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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* StringFunctionCall::evaluate(txIEvalContext* aContext)
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{
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txListIterator iter(¶ms);
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switch (mType) {
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case CONCAT:
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{
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if (!requireParams(2, aContext))
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return new StringResult(NS_LITERAL_STRING("error"));
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String resultStr;
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while (iter.hasNext()) {
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evaluateToString((Expr*)iter.next(), aContext, resultStr);
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}
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return new StringResult(resultStr);
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}
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case CONTAINS:
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{
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if (!requireParams(2, 2, aContext))
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return new StringResult(NS_LITERAL_STRING("error"));
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String arg1, arg2;
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evaluateToString((Expr*)iter.next(), aContext, arg1);
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evaluateToString((Expr*)iter.next(), aContext, arg2);
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return new BooleanResult(arg1.indexOf(arg2) >= 0);
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}
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case NORMALIZE_SPACE:
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{
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if (!requireParams(0, 1, aContext))
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return new StringResult(NS_LITERAL_STRING("error"));
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String resultStr;
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if (iter.hasNext())
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evaluateToString((Expr*)iter.next(), aContext, resultStr);
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else
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XMLDOMUtils::getNodeValue(aContext->getContextNode(),
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resultStr);
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MBool addSpace = MB_FALSE;
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MBool first = MB_TRUE;
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String normed;
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normed.getNSString().SetCapacity(resultStr.Length());
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PRUnichar c;
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PRUint32 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 = MB_TRUE;
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}
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else {
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if (addSpace && !first)
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normed.Append(PRUnichar(' '));
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normed.Append(c);
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addSpace = MB_FALSE;
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first = MB_FALSE;
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}
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}
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return new StringResult(normed);
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}
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case STARTS_WITH:
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{
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if (!requireParams(2, 2, aContext))
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return new StringResult(NS_LITERAL_STRING("error"));
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String arg1, arg2;
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evaluateToString((Expr*)iter.next(), aContext, arg1);
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evaluateToString((Expr*)iter.next(), aContext, arg2);
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return new BooleanResult(arg1.indexOf(arg2) == 0);
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}
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case STRING_LENGTH:
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{
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if (!requireParams(0, 1, aContext))
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return new StringResult(NS_LITERAL_STRING("error"));
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String resultStr;
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if (iter.hasNext())
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evaluateToString((Expr*)iter.next(), aContext, resultStr);
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else
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XMLDOMUtils::getNodeValue(aContext->getContextNode(),
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resultStr);
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return new NumberResult(resultStr.Length());
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}
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case SUBSTRING:
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{
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if (!requireParams(2, 3, aContext))
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return new StringResult(NS_LITERAL_STRING("error"));
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String src;
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double start, end;
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evaluateToString((Expr*)iter.next(), aContext, src);
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start = evaluateToNumber((Expr*)iter.next(), aContext);
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// check for NaN or +/-Inf
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if (Double::isNaN(start) ||
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Double::isInfinite(start) ||
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start >= src.Length() + 0.5)
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return new StringResult();
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start = floor(start + 0.5) - 1;
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if (iter.hasNext()) {
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end = start + evaluateToNumber((Expr*)iter.next(),
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aContext);
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if (Double::isNaN(end) || end < 0)
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return new StringResult();
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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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return new StringResult();
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String resultStr;
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src.subString((PRUint32)start, (PRUint32)end, resultStr);
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return new StringResult(resultStr);
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}
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case SUBSTRING_AFTER:
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{
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if (!requireParams(2, 2, aContext))
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return new StringResult(NS_LITERAL_STRING("error"));
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String arg1, arg2;
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evaluateToString((Expr*)iter.next(), aContext, arg1);
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evaluateToString((Expr*)iter.next(), aContext, arg2);
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PRInt32 idx = arg1.indexOf(arg2);
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if (idx != kNotFound) {
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PRUint32 len = arg2.Length();
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arg1.subString(idx + len, arg2);
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return new StringResult(arg2);
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}
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return new StringResult();
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}
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case SUBSTRING_BEFORE:
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{
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if (!requireParams(2, 2, aContext))
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return new StringResult(NS_LITERAL_STRING("error"));
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String arg1, arg2;
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evaluateToString((Expr*)iter.next(), aContext, arg1);
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evaluateToString((Expr*)iter.next(), aContext, arg2);
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PRInt32 idx = arg1.indexOf(arg2);
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if (idx != kNotFound) {
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arg2.Truncate();
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arg1.subString(0, idx, arg2);
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return new StringResult(arg2);
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}
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return new StringResult();
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}
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case TRANSLATE:
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{
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if (!requireParams(3, 3, aContext))
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return new StringResult(NS_LITERAL_STRING("error"));
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String src;
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evaluateToString((Expr*)iter.next(), aContext, src);
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if (src.IsEmpty())
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return new StringResult();
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String oldChars, newChars, dest;
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evaluateToString((Expr*)iter.next(), aContext, oldChars);
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evaluateToString((Expr*)iter.next(), aContext, newChars);
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PRUint32 i;
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PRInt32 newCharsLength = (PRInt32)newChars.Length();
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for (i = 0; i < src.Length(); i++) {
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PRInt32 idx = oldChars.indexOf(src.CharAt(i));
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if (idx != kNotFound) {
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if (idx < newCharsLength)
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dest.Append(newChars.CharAt((PRUint32)idx));
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}
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else {
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dest.Append(src.CharAt(i));
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}
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}
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return new StringResult(dest);
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}
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case STRING:
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{
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if (!requireParams(0, 1, aContext))
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return new StringResult(NS_LITERAL_STRING("error"));
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String resultStr;
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if (iter.hasNext())
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evaluateToString((Expr*)iter.next(), aContext, resultStr);
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else
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XMLDOMUtils::getNodeValue(aContext->getContextNode(),
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resultStr);
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return new StringResult(resultStr);
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}
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}
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String err(NS_LITERAL_STRING("Internal error"));
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aContext->receiveError(err, NS_ERROR_UNEXPECTED);
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return new StringResult(NS_LITERAL_STRING("error"));
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}
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nsresult StringFunctionCall::getNameAtom(txAtom** aAtom)
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{
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switch (mType) {
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case CONCAT:
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{
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*aAtom = txXPathAtoms::concat;
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break;
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}
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case CONTAINS:
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{
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*aAtom = txXPathAtoms::contains;
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break;
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}
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case NORMALIZE_SPACE:
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{
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*aAtom = txXPathAtoms::normalizeSpace;
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break;
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}
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case STARTS_WITH:
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{
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*aAtom = txXPathAtoms::startsWith;
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break;
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}
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case STRING:
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{
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*aAtom = txXPathAtoms::string;
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break;
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}
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case STRING_LENGTH:
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{
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*aAtom = txXPathAtoms::stringLength;
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break;
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}
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case SUBSTRING:
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{
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*aAtom = txXPathAtoms::substring;
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break;
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}
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case SUBSTRING_AFTER:
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{
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*aAtom = txXPathAtoms::substringAfter;
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break;
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}
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case SUBSTRING_BEFORE:
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{
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*aAtom = txXPathAtoms::substringBefore;
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break;
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}
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case TRANSLATE:
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{
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*aAtom = txXPathAtoms::translate;
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break;
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}
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default:
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{
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*aAtom = 0;
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return NS_ERROR_FAILURE;
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}
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}
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TX_ADDREF_ATOM(*aAtom);
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return NS_OK;
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}
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