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2f2ae146c0
RetroZilla/extensions/transformiix/source/xpath/StringFunctionCall.cpp
Ryan Nematz 2f2ae146c0 first commit
2015-10-20 23:03:22 -04:00

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is TransforMiiX XSLT processor code.
*
* The Initial Developer of the Original Code is
* The MITRE Corporation.
* Portions created by the Initial Developer are Copyright (C) 1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Keith Visco <kvisco@ziplink.net> (Original Author)
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/**
* StringFunctionCall
* A representation of the XPath String funtions
**/
#include "ExprResult.h"
#include "FunctionLib.h"
#include "txAtoms.h"
#include "txError.h"
#include "txIXPathContext.h"
#include "XMLUtils.h"
#include "txXPathTreeWalker.h"
#include <math.h>
#include "nsReadableUtils.h"
/**
* Creates a StringFunctionCall of the given type
**/
StringFunctionCall::StringFunctionCall(StringFunctions aType) : mType(aType)
{
}
/**
* Evaluates this Expr based on the given context node and processor state
* @param context the context node for evaluation of this Expr
* @param ps the ContextState containing the stack information needed
* for evaluation
* @return the result of the evaluation
**/
nsresult
StringFunctionCall::evaluate(txIEvalContext* aContext, txAExprResult** aResult)
{
*aResult = nsnull;
nsresult rv = NS_OK;
txListIterator iter(&params);
switch (mType) {
case CONCAT:
{
if (!requireParams(2, -1, aContext))
return NS_ERROR_XPATH_BAD_ARGUMENT_COUNT;
nsRefPtr<StringResult> strRes;
rv = aContext->recycler()->getStringResult(getter_AddRefs(strRes));
NS_ENSURE_SUCCESS(rv, rv);
while (iter.hasNext()) {
evaluateToString((Expr*)iter.next(), aContext, strRes->mValue);
}
*aResult = strRes;
NS_ADDREF(*aResult);
return NS_OK;
}
case CONTAINS:
{
if (!requireParams(2, 2, aContext))
return NS_ERROR_XPATH_BAD_ARGUMENT_COUNT;
nsAutoString arg1, arg2;
Expr* arg1Expr = (Expr*)iter.next();
evaluateToString((Expr*)iter.next(), aContext, arg2);
if (arg2.IsEmpty()) {
aContext->recycler()->getBoolResult(PR_TRUE, aResult);
}
else {
evaluateToString(arg1Expr, aContext, arg1);
aContext->recycler()->getBoolResult(arg1.Find(arg2) >= 0,
aResult);
}
return NS_OK;
}
case NORMALIZE_SPACE:
{
if (!requireParams(0, 1, aContext))
return NS_ERROR_XPATH_BAD_ARGUMENT_COUNT;
nsAutoString resultStr;
if (iter.hasNext())
evaluateToString((Expr*)iter.next(), aContext, resultStr);
else
txXPathNodeUtils::appendNodeValue(aContext->getContextNode(),
resultStr);
nsRefPtr<StringResult> strRes;
rv = aContext->recycler()->getStringResult(getter_AddRefs(strRes));
NS_ENSURE_SUCCESS(rv, rv);
MBool addSpace = MB_FALSE;
MBool first = MB_TRUE;
strRes->mValue.SetCapacity(resultStr.Length());
PRUnichar c;
PRUint32 src;
for (src = 0; src < resultStr.Length(); src++) {
c = resultStr.CharAt(src);
if (XMLUtils::isWhitespace(c)) {
addSpace = MB_TRUE;
}
else {
if (addSpace && !first)
strRes->mValue.Append(PRUnichar(' '));
strRes->mValue.Append(c);
addSpace = MB_FALSE;
first = MB_FALSE;
}
}
*aResult = strRes;
NS_ADDREF(*aResult);
return NS_OK;
}
case STARTS_WITH:
{
if (!requireParams(2, 2, aContext))
return NS_ERROR_XPATH_BAD_ARGUMENT_COUNT;
nsAutoString arg1, arg2;
Expr* arg1Expr = (Expr*)iter.next();
evaluateToString((Expr*)iter.next(), aContext, arg2);
if (arg2.IsEmpty()) {
aContext->recycler()->getBoolResult(PR_TRUE, aResult);
}
else {
evaluateToString(arg1Expr, aContext, arg1);
aContext->recycler()->getBoolResult(
StringBeginsWith(arg1, arg2), aResult);
}
return NS_OK;
}
case STRING_LENGTH:
{
if (!requireParams(0, 1, aContext))
return NS_ERROR_XPATH_BAD_ARGUMENT_COUNT;
nsAutoString resultStr;
if (iter.hasNext())
evaluateToString((Expr*)iter.next(), aContext, resultStr);
else
txXPathNodeUtils::appendNodeValue(aContext->getContextNode(),
resultStr);
rv = aContext->recycler()->getNumberResult(resultStr.Length(),
aResult);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
case SUBSTRING:
{
if (!requireParams(2, 3, aContext))
return NS_ERROR_XPATH_BAD_ARGUMENT_COUNT;
nsAutoString src;
double start, end;
evaluateToString((Expr*)iter.next(), aContext, src);
start = evaluateToNumber((Expr*)iter.next(), aContext);
// check for NaN or +/-Inf
if (Double::isNaN(start) ||
Double::isInfinite(start) ||
start >= src.Length() + 0.5) {
aContext->recycler()->getEmptyStringResult(aResult);
return NS_OK;
}
start = floor(start + 0.5) - 1;
if (iter.hasNext()) {
end = start + evaluateToNumber((Expr*)iter.next(),
aContext);
if (Double::isNaN(end) || end < 0) {
aContext->recycler()->getEmptyStringResult(aResult);
return NS_OK;
}
if (end > src.Length())
end = src.Length();
else
end = floor(end + 0.5);
}
else {
end = src.Length();
}
if (start < 0)
start = 0;
if (start > end) {
aContext->recycler()->getEmptyStringResult(aResult);
return NS_OK;
}
return aContext->recycler()->getStringResult(
Substring(src, (PRUint32)start, (PRUint32)(end - start)),
aResult);
}
case SUBSTRING_AFTER:
{
if (!requireParams(2, 2, aContext))
return NS_ERROR_XPATH_BAD_ARGUMENT_COUNT;
nsAutoString arg1, arg2;
evaluateToString((Expr*)iter.next(), aContext, arg1);
evaluateToString((Expr*)iter.next(), aContext, arg2);
if (arg2.IsEmpty()) {
return aContext->recycler()->getStringResult(arg1, aResult);
}
PRInt32 idx = arg1.Find(arg2);
if (idx == kNotFound) {
aContext->recycler()->getEmptyStringResult(aResult);
return NS_OK;
}
PRUint32 len = arg2.Length();
return aContext->recycler()->getStringResult(
Substring(arg1, idx + len, arg1.Length() - (idx + len)),
aResult);
}
case SUBSTRING_BEFORE:
{
if (!requireParams(2, 2, aContext))
return NS_ERROR_XPATH_BAD_ARGUMENT_COUNT;
nsAutoString arg1, arg2;
Expr* arg1Expr = (Expr*)iter.next();
evaluateToString((Expr*)iter.next(), aContext, arg2);
if (arg2.IsEmpty()) {
aContext->recycler()->getEmptyStringResult(aResult);
return NS_OK;
}
evaluateToString(arg1Expr, aContext, arg1);
PRInt32 idx = arg1.Find(arg2);
if (idx == kNotFound) {
aContext->recycler()->getEmptyStringResult(aResult);
return NS_OK;
}
return aContext->recycler()->
getStringResult(Substring(arg1, 0, idx), aResult);
}
case TRANSLATE:
{
if (!requireParams(3, 3, aContext))
return NS_ERROR_XPATH_BAD_ARGUMENT_COUNT;
nsAutoString src;
evaluateToString((Expr*)iter.next(), aContext, src);
if (src.IsEmpty()) {
aContext->recycler()->getEmptyStringResult(aResult);
return NS_OK;
}
nsRefPtr<StringResult> strRes;
rv = aContext->recycler()->getStringResult(getter_AddRefs(strRes));
NS_ENSURE_SUCCESS(rv, rv);
strRes->mValue.SetCapacity(src.Length());
nsAutoString oldChars, newChars;
evaluateToString((Expr*)iter.next(), aContext, oldChars);
evaluateToString((Expr*)iter.next(), aContext, newChars);
PRUint32 i;
PRInt32 newCharsLength = (PRInt32)newChars.Length();
for (i = 0; i < src.Length(); i++) {
PRInt32 idx = oldChars.FindChar(src.CharAt(i));
if (idx != kNotFound) {
if (idx < newCharsLength)
strRes->mValue.Append(newChars.CharAt((PRUint32)idx));
}
else {
strRes->mValue.Append(src.CharAt(i));
}
}
*aResult = strRes;
NS_ADDREF(*aResult);
return NS_OK;
}
case STRING:
{
if (!requireParams(0, 1, aContext))
return NS_ERROR_XPATH_BAD_ARGUMENT_COUNT;
nsRefPtr<StringResult> strRes;
rv = aContext->recycler()->getStringResult(getter_AddRefs(strRes));
NS_ENSURE_SUCCESS(rv, rv);
if (iter.hasNext())
evaluateToString((Expr*)iter.next(), aContext, strRes->mValue);
else
txXPathNodeUtils::appendNodeValue(aContext->getContextNode(),
strRes->mValue);
*aResult = strRes;
NS_ADDREF(*aResult);
return NS_OK;
}
}
aContext->receiveError(NS_LITERAL_STRING("Internal error"),
NS_ERROR_UNEXPECTED);
return NS_ERROR_UNEXPECTED;
}
#ifdef TX_TO_STRING
nsresult
StringFunctionCall::getNameAtom(nsIAtom** aAtom)
{
switch (mType) {
case CONCAT:
{
*aAtom = txXPathAtoms::concat;
break;
}
case CONTAINS:
{
*aAtom = txXPathAtoms::contains;
break;
}
case NORMALIZE_SPACE:
{
*aAtom = txXPathAtoms::normalizeSpace;
break;
}
case STARTS_WITH:
{
*aAtom = txXPathAtoms::startsWith;
break;
}
case STRING:
{
*aAtom = txXPathAtoms::string;
break;
}
case STRING_LENGTH:
{
*aAtom = txXPathAtoms::stringLength;
break;
}
case SUBSTRING:
{
*aAtom = txXPathAtoms::substring;
break;
}
case SUBSTRING_AFTER:
{
*aAtom = txXPathAtoms::substringAfter;
break;
}
case SUBSTRING_BEFORE:
{
*aAtom = txXPathAtoms::substringBefore;
break;
}
case TRANSLATE:
{
*aAtom = txXPathAtoms::translate;
break;
}
default:
{
*aAtom = 0;
return NS_ERROR_FAILURE;
}
}
NS_ADDREF(*aAtom);
return NS_OK;
}
#endif
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