gecko/content/base/src/nsParserUtils.cpp

306 lines
8.9 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** 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 Mozilla Communicator client code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of 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 ***** */
/*
* Namespace class for some static parsing-related methods.
*/
#include "nsParserUtils.h"
#include "nsIParser.h" // for kQuote et. al.
#include "jsapi.h"
#include "nsReadableUtils.h"
#include "nsCRT.h"
#include "nsContentUtils.h"
#include "nsIParserService.h"
#define SKIP_WHITESPACE(iter, end_iter, end_res) \
while ((iter) != (end_iter) && nsCRT::IsAsciiSpace(*(iter))) { \
++(iter); \
} \
if ((iter) == (end_iter)) { \
return (end_res); \
}
#define SKIP_ATTR_NAME(iter, end_iter) \
while ((iter) != (end_iter) && !nsCRT::IsAsciiSpace(*(iter)) && \
*(iter) != '=') { \
++(iter); \
}
PRBool
nsParserUtils::GetQuotedAttributeValue(const nsString& aSource, nsIAtom *aName,
nsAString& aValue)
{
aValue.Truncate();
const PRUnichar *start = aSource.get();
const PRUnichar *end = start + aSource.Length();
const PRUnichar *iter;
while (start != end) {
SKIP_WHITESPACE(start, end, PR_FALSE)
iter = start;
SKIP_ATTR_NAME(iter, end)
if (start == iter) {
return PR_FALSE;
}
// Remember the attr name.
const nsDependentSubstring & attrName = Substring(start, iter);
// Now check whether this is a valid name="value" pair.
start = iter;
SKIP_WHITESPACE(start, end, PR_FALSE)
if (*start != '=') {
// No '=', so this is not a name="value" pair. We don't know
// what it is, and we have no way to handle it.
return PR_FALSE;
}
// Have to skip the value.
++start;
SKIP_WHITESPACE(start, end, PR_FALSE)
PRUnichar q = *start;
if (q != kQuote && q != kApostrophe) {
// Not a valid quoted value, so bail.
return PR_FALSE;
}
++start; // Point to the first char of the value.
iter = start;
while (iter != end && *iter != q) {
++iter;
}
if (iter == end) {
// Oops, unterminated quoted string.
return PR_FALSE;
}
// At this point attrName holds the name of the "attribute" and
// the value is between start and iter.
if (aName->Equals(attrName)) {
nsIParserService* parserService = nsContentUtils::GetParserService();
NS_ENSURE_TRUE(parserService, PR_FALSE);
// We'll accumulate as many characters as possible (until we hit either
// the end of the string or the beginning of an entity). Chunks will be
// delimited by start and chunkEnd.
const PRUnichar *chunkEnd = start;
while (chunkEnd != iter) {
if (*chunkEnd == kLessThan) {
aValue.Truncate();
return PR_FALSE;
}
if (*chunkEnd == kAmpersand) {
aValue.Append(start, chunkEnd - start);
// Point to first character after the ampersand.
++chunkEnd;
const PRUnichar *afterEntity;
PRUnichar result[2];
PRUint32 count =
parserService->DecodeEntity(chunkEnd, iter, &afterEntity, result);
if (count == 0) {
aValue.Truncate();
return PR_FALSE;
}
aValue.Append(result, count);
// Advance to after the entity and begin a new chunk.
start = chunkEnd = afterEntity;
}
else {
++chunkEnd;
}
}
// Append remainder.
aValue.Append(start, iter - start);
return PR_TRUE;
}
// Resume scanning after the end of the attribute value (past the quote
// char).
start = iter + 1;
}
return PR_FALSE;
}
PRBool
nsParserUtils::GetQuotedAttrNameAt(const nsString& aSource, PRUint32 aIndex,
nsAString& aName)
{
aName.Truncate();
const PRUnichar *start = aSource.get();
const PRUnichar *end = start + aSource.Length();
const PRUnichar *iter;
PRUint32 currIndex = 0;
for (;;) {
SKIP_WHITESPACE(start, end, PR_TRUE)
iter = start;
SKIP_ATTR_NAME(iter, end)
if (start == iter) {
return PR_FALSE;
}
// Remember the attr name.
const nsDependentSubstring & attrName = Substring(start, iter);
// Now check whether this is a valid name="value" pair.
start = iter;
SKIP_WHITESPACE(start, end, PR_FALSE);
if (*start != '=') {
// No '=', so this is not a name="value" pair. We don't know
// what it is, and we have no way to handle it.
return PR_FALSE;
}
// Have to skip the value.
++start;
SKIP_WHITESPACE(start, end, PR_FALSE);
PRUnichar q = *start;
if (q != kQuote && q != kApostrophe) {
// Not a valid quoted value, so bail.
return PR_FALSE;
}
// Scan to the end of the value.
do {
++start;
} while (start != end && *start != q);
if (start == end) {
// Oops, unterminated quoted string.
return PR_FALSE;
}
// At this point attrName holds the name of the "attribute"
if (aIndex == currIndex) {
aName = attrName;
return PR_TRUE;
}
// Resume scanning after the end of the attribute value (past the quote
// char).
++start;
++currIndex;
}
return PR_TRUE;
}
// Returns PR_TRUE if the language name is a version of JavaScript and
// PR_FALSE otherwise
PRBool
nsParserUtils::IsJavaScriptLanguage(const nsString& aName, PRUint32 *aFlags)
{
JSVersion version = JSVERSION_UNKNOWN;
if (aName.LowerCaseEqualsLiteral("javascript") ||
aName.LowerCaseEqualsLiteral("livescript") ||
aName.LowerCaseEqualsLiteral("mocha")) {
version = JSVERSION_DEFAULT;
}
else if (aName.LowerCaseEqualsLiteral("javascript1.0")) {
version = JSVERSION_1_0;
}
else if (aName.LowerCaseEqualsLiteral("javascript1.1")) {
version = JSVERSION_1_1;
}
else if (aName.LowerCaseEqualsLiteral("javascript1.2")) {
version = JSVERSION_1_2;
}
else if (aName.LowerCaseEqualsLiteral("javascript1.3")) {
version = JSVERSION_1_3;
}
else if (aName.LowerCaseEqualsLiteral("javascript1.4")) {
version = JSVERSION_1_4;
}
else if (aName.LowerCaseEqualsLiteral("javascript1.5")) {
version = JSVERSION_1_5;
}
else if (aName.LowerCaseEqualsLiteral("javascript1.6")) {
version = JSVERSION_1_6;
}
else if (aName.LowerCaseEqualsLiteral("javascript1.7")) {
version = JSVERSION_1_7;
}
else if (aName.LowerCaseEqualsLiteral("javascript1.8")) {
version = JSVERSION_1_8;
}
if (version == JSVERSION_UNKNOWN)
return PR_FALSE;
*aFlags = version;
return PR_TRUE;
}
void
nsParserUtils::SplitMimeType(const nsAString& aValue, nsString& aType,
nsString& aParams)
{
aType.Truncate();
aParams.Truncate();
PRInt32 semiIndex = aValue.FindChar(PRUnichar(';'));
if (-1 != semiIndex) {
aType = Substring(aValue, 0, semiIndex);
aParams = Substring(aValue, semiIndex + 1,
aValue.Length() - (semiIndex + 1));
aParams.StripWhitespace();
}
else {
aType = aValue;
}
aType.StripWhitespace();
}