mirror of
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306 lines
8.9 KiB
C++
306 lines
8.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Communicator client code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/*
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* Namespace class for some static parsing-related methods.
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*/
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#include "nsParserUtils.h"
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#include "nsIParser.h" // for kQuote et. al.
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#include "jsapi.h"
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#include "nsReadableUtils.h"
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#include "nsCRT.h"
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#include "nsContentUtils.h"
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#include "nsIParserService.h"
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#define SKIP_WHITESPACE(iter, end_iter, end_res) \
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while ((iter) != (end_iter) && nsCRT::IsAsciiSpace(*(iter))) { \
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++(iter); \
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} \
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if ((iter) == (end_iter)) { \
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return (end_res); \
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}
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#define SKIP_ATTR_NAME(iter, end_iter) \
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while ((iter) != (end_iter) && !nsCRT::IsAsciiSpace(*(iter)) && \
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*(iter) != '=') { \
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++(iter); \
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}
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PRBool
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nsParserUtils::GetQuotedAttributeValue(const nsString& aSource, nsIAtom *aName,
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nsAString& aValue)
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{
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aValue.Truncate();
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const PRUnichar *start = aSource.get();
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const PRUnichar *end = start + aSource.Length();
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const PRUnichar *iter;
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while (start != end) {
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SKIP_WHITESPACE(start, end, PR_FALSE)
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iter = start;
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SKIP_ATTR_NAME(iter, end)
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if (start == iter) {
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return PR_FALSE;
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}
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// Remember the attr name.
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const nsDependentSubstring & attrName = Substring(start, iter);
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// Now check whether this is a valid name="value" pair.
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start = iter;
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SKIP_WHITESPACE(start, end, PR_FALSE)
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if (*start != '=') {
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// No '=', so this is not a name="value" pair. We don't know
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// what it is, and we have no way to handle it.
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return PR_FALSE;
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}
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// Have to skip the value.
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++start;
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SKIP_WHITESPACE(start, end, PR_FALSE)
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PRUnichar q = *start;
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if (q != kQuote && q != kApostrophe) {
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// Not a valid quoted value, so bail.
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return PR_FALSE;
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}
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++start; // Point to the first char of the value.
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iter = start;
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while (iter != end && *iter != q) {
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++iter;
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}
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if (iter == end) {
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// Oops, unterminated quoted string.
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return PR_FALSE;
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}
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// At this point attrName holds the name of the "attribute" and
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// the value is between start and iter.
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if (aName->Equals(attrName)) {
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nsIParserService* parserService = nsContentUtils::GetParserService();
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NS_ENSURE_TRUE(parserService, PR_FALSE);
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// We'll accumulate as many characters as possible (until we hit either
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// the end of the string or the beginning of an entity). Chunks will be
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// delimited by start and chunkEnd.
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const PRUnichar *chunkEnd = start;
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while (chunkEnd != iter) {
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if (*chunkEnd == kLessThan) {
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aValue.Truncate();
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return PR_FALSE;
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}
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if (*chunkEnd == kAmpersand) {
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aValue.Append(start, chunkEnd - start);
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// Point to first character after the ampersand.
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++chunkEnd;
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const PRUnichar *afterEntity;
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PRUnichar result[2];
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PRUint32 count =
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parserService->DecodeEntity(chunkEnd, iter, &afterEntity, result);
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if (count == 0) {
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aValue.Truncate();
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return PR_FALSE;
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}
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aValue.Append(result, count);
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// Advance to after the entity and begin a new chunk.
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start = chunkEnd = afterEntity;
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}
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else {
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++chunkEnd;
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}
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}
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// Append remainder.
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aValue.Append(start, iter - start);
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return PR_TRUE;
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}
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// Resume scanning after the end of the attribute value (past the quote
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// char).
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start = iter + 1;
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}
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return PR_FALSE;
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}
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PRBool
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nsParserUtils::GetQuotedAttrNameAt(const nsString& aSource, PRUint32 aIndex,
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nsAString& aName)
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{
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aName.Truncate();
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const PRUnichar *start = aSource.get();
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const PRUnichar *end = start + aSource.Length();
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const PRUnichar *iter;
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PRUint32 currIndex = 0;
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for (;;) {
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SKIP_WHITESPACE(start, end, PR_TRUE)
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iter = start;
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SKIP_ATTR_NAME(iter, end)
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if (start == iter) {
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return PR_FALSE;
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}
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// Remember the attr name.
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const nsDependentSubstring & attrName = Substring(start, iter);
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// Now check whether this is a valid name="value" pair.
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start = iter;
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SKIP_WHITESPACE(start, end, PR_FALSE);
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if (*start != '=') {
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// No '=', so this is not a name="value" pair. We don't know
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// what it is, and we have no way to handle it.
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return PR_FALSE;
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}
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// Have to skip the value.
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++start;
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SKIP_WHITESPACE(start, end, PR_FALSE);
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PRUnichar q = *start;
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if (q != kQuote && q != kApostrophe) {
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// Not a valid quoted value, so bail.
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return PR_FALSE;
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}
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// Scan to the end of the value.
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do {
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++start;
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} while (start != end && *start != q);
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if (start == end) {
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// Oops, unterminated quoted string.
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return PR_FALSE;
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}
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// At this point attrName holds the name of the "attribute"
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if (aIndex == currIndex) {
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aName = attrName;
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return PR_TRUE;
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}
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// Resume scanning after the end of the attribute value (past the quote
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// char).
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++start;
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++currIndex;
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}
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return PR_TRUE;
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}
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// Returns PR_TRUE if the language name is a version of JavaScript and
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// PR_FALSE otherwise
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PRBool
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nsParserUtils::IsJavaScriptLanguage(const nsString& aName, PRUint32 *aFlags)
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{
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JSVersion version = JSVERSION_UNKNOWN;
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if (aName.LowerCaseEqualsLiteral("javascript") ||
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aName.LowerCaseEqualsLiteral("livescript") ||
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aName.LowerCaseEqualsLiteral("mocha")) {
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version = JSVERSION_DEFAULT;
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}
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else if (aName.LowerCaseEqualsLiteral("javascript1.0")) {
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version = JSVERSION_1_0;
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}
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else if (aName.LowerCaseEqualsLiteral("javascript1.1")) {
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version = JSVERSION_1_1;
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}
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else if (aName.LowerCaseEqualsLiteral("javascript1.2")) {
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version = JSVERSION_1_2;
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}
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else if (aName.LowerCaseEqualsLiteral("javascript1.3")) {
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version = JSVERSION_1_3;
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}
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else if (aName.LowerCaseEqualsLiteral("javascript1.4")) {
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version = JSVERSION_1_4;
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}
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else if (aName.LowerCaseEqualsLiteral("javascript1.5")) {
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version = JSVERSION_1_5;
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}
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else if (aName.LowerCaseEqualsLiteral("javascript1.6")) {
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version = JSVERSION_1_6;
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}
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else if (aName.LowerCaseEqualsLiteral("javascript1.7")) {
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version = JSVERSION_1_7;
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}
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else if (aName.LowerCaseEqualsLiteral("javascript1.8")) {
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version = JSVERSION_1_8;
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}
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if (version == JSVERSION_UNKNOWN)
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return PR_FALSE;
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*aFlags = version;
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return PR_TRUE;
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}
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void
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nsParserUtils::SplitMimeType(const nsAString& aValue, nsString& aType,
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nsString& aParams)
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{
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aType.Truncate();
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aParams.Truncate();
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PRInt32 semiIndex = aValue.FindChar(PRUnichar(';'));
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if (-1 != semiIndex) {
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aType = Substring(aValue, 0, semiIndex);
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aParams = Substring(aValue, semiIndex + 1,
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aValue.Length() - (semiIndex + 1));
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aParams.StripWhitespace();
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}
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else {
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aType = aValue;
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}
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aType.StripWhitespace();
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}
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