mirror of
https://github.com/rn10950/RetroZilla.git
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440 lines
10 KiB
C++
440 lines
10 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 XForms support.
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*
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* The Initial Developer of the Original Code is
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* Novell, Inc.
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* Portions created by the Initial Developer are Copyright (C) 2004
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Allan Beaufour <abeaufour@novell.com>
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* David Landwehr <dlandwehr@novell.com>
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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 the GNU General Public License Version 2 or later (the "GPL"), or
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* 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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#include "nsXFormsXPathScanner.h"
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#include "nsXFormsXPathXMLUtil.h"
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nsXFormsXPathScanner::nsXFormsXPathScanner()
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{
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MOZ_COUNT_CTOR(nsXFormsXPathScanner);
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}
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nsXFormsXPathScanner::nsXFormsXPathScanner(const nsAString& aExpression)
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{
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MOZ_COUNT_CTOR(nsXFormsXPathScanner);
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Init(aExpression);
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}
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nsXFormsXPathScanner::~nsXFormsXPathScanner()
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{
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MOZ_COUNT_DTOR(nsXFormsXPathScanner);
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}
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void
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nsXFormsXPathScanner::Init(const nsAString& aExpression)
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{
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mExpression = aExpression;
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mSize = mExpression.Length();
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mLength = 0;
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mOffset = -1;
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mLast = NONE;
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mState = NONE;
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}
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PRInt32
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nsXFormsXPathScanner::Length()
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{
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return mLength;
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}
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PRInt32
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nsXFormsXPathScanner::Offset()
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{
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return mOffset;
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}
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nsAString&
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nsXFormsXPathScanner::Expression()
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{
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return mExpression;
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}
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PRUnichar
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nsXFormsXPathScanner::PopChar()
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{
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PRUnichar c = '\0';
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mLength++;
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if (mOffset + mLength < mSize) {
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c = mExpression[mOffset + mLength];
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}
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return c;
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}
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PRUnichar
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nsXFormsXPathScanner::PeekChar()
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{
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return PeekChar(mOffset + mLength + 1);
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}
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PRUnichar
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nsXFormsXPathScanner::PeekChar(PRInt32 aOffset)
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{
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if (mSize > aOffset)
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return mExpression[aOffset];
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return '\0';
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}
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PRUnichar
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nsXFormsXPathScanner::NextNonWhite()
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{
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return PeekChar(GetOffsetForNonWhite());
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}
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int
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nsXFormsXPathScanner::GetOffsetForNonWhite()
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{
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PRInt32 co = mOffset + mLength + 1;
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while (nsXFormsXPathXMLUtil::IsWhitespace(PeekChar(co)))
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co++;
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return co;
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}
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PRBool
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nsXFormsXPathScanner::HasMoreTokens()
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{
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return mState != XPATHEOF;
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}
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nsXFormsXPathScanner::XPATHTOKEN
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nsXFormsXPathScanner::NextToken()
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{
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if (mState != WHITESPACE)
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mLast = mState;
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mOffset = mOffset + mLength;
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mLength = 0;
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PRUnichar c = PeekChar();
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if (c == '\0') {
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mState = XPATHEOF;
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} else if (nsXFormsXPathXMLUtil::IsDigit(c)) {
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mState = ScanNumber();
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} else if (c == '_' || nsXFormsXPathXMLUtil::IsLetter(c)) {
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mState = ScanQName();
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} else if (c == '"' || c == '\'') {
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mState = ScanLiteral();
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} else {
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switch (c) {
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case '(':
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mState = LPARAN;
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PopChar();
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break;
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case ')':
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mState = RPARAN;
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PopChar();
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break;
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case '[':
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mState = LBRACK;
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PopChar();
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break;
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case ']':
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mState = RBRACK;
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PopChar();
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break;
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case '@':
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mState = AT;
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PopChar();
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break;
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case ',':
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mState = COMMA;
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PopChar();
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break;
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case ':':
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PopChar();
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if (PeekChar() == ':') {
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mState = COLONCOLON;
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PopChar();
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} else
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mState = ERRORXPATHTOKEN;
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break;
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case '.':
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PopChar();
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if (PeekChar() == '.') {
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mState = DOTDOT;
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PopChar();
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} else if (nsXFormsXPathXMLUtil::IsDigit(PeekChar()))
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mState = ScanNumber();
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else
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mState = DOT;
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break;
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case '$':
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mState = ScanVariable();
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break;
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case '/':
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PopChar();
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if (PeekChar() == '/') {
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mState = SLASHSLASH;
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PopChar();
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} else
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mState = SLASH;
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break;
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case '|':
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PopChar();
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mState = UNION;
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break;
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case '+':
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PopChar();
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mState = PLUS;
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break;
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case '-':
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PopChar();
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mState = MINUS;
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break;
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case '=':
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PopChar();
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mState = EQUAL;
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break;
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case '!':
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PopChar();
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if (PeekChar() == '=') {
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mState = NOTEQUAL;
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PopChar();
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} else
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mState = ERRORXPATHTOKEN;
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break;
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case '<':
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PopChar();
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if (PeekChar() == '=') {
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mState = LEQUAL;
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PopChar();
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} else
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mState = LESS;
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break;
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case '>':
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PopChar();
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if (PeekChar() == '=') {
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mState = GEQUAL;
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PopChar();
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} else
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mState = GREATER;
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break;
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case '*':
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PopChar();
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mState = SolveStar();
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break;
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case '\r':
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case '\n':
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case '\t':
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case ' ':
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mState = ScanWhitespace();
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break;
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default:
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PopChar();
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mState = ERRORXPATHTOKEN;
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}
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}
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return mState;
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}
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PRBool
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nsXFormsXPathScanner::SolveDiambiguate()
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{
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return mLast != NONE && (mLast != AT && mLast != COLONCOLON && mLast != LPARAN && mLast != LBRACK &&
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mLast != AND && mLast != OR && mLast != DIV && mLast != MOD && mLast != SLASH && mLast != MULTIPLYOPERATOR &&
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mLast != SLASHSLASH && mLast != UNION && mLast != PLUS && mLast != MINUS && mLast != NOTEQUAL && mLast != EQUAL && mLast != LESS &&
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mLast != LEQUAL && mLast != GEQUAL && mLast != GREATER && mLast != COMMA);
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}
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nsXFormsXPathScanner::XPATHTOKEN
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nsXFormsXPathScanner::SolveStar()
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{
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if (SolveDiambiguate())
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return MULTIPLYOPERATOR;
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return STAR;
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}
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nsXFormsXPathScanner::XPATHTOKEN
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nsXFormsXPathScanner::ScanNumber()
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{
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PRUnichar c = PopChar();
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PRBool decimal = (c == '.');
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while (c != '\0') {
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c = PeekChar();
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if (!decimal && c == '.') {
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decimal = PR_TRUE;
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} else if (!nsXFormsXPathXMLUtil::IsDigit(c)) {
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return NUMBER;
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}
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PopChar();
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}
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return NUMBER;
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}
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nsXFormsXPathScanner::XPATHTOKEN
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nsXFormsXPathScanner::ScanVariable()
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{
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PopChar();
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if (ScanQName() != ERRORXPATHTOKEN)
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return VARIABLE;
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return ERRORXPATHTOKEN;
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}
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nsXFormsXPathScanner::XPATHTOKEN
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nsXFormsXPathScanner::ScanWhitespace()
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{
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PRUnichar c;
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do {
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PopChar();
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c = PeekChar();
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} while (nsXFormsXPathXMLUtil::IsWhitespace(c));
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return WHITESPACE;
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}
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nsXFormsXPathScanner::XPATHTOKEN
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nsXFormsXPathScanner::ScanLiteral()
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{
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PRUnichar c = PopChar();
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PRUnichar p;
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while ((p = PeekChar()) != c && p != '\0')
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PopChar();
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if (p == '\0')
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return ERRORXPATHTOKEN;
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PopChar();
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return LITERAL;
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}
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nsXFormsXPathScanner::XPATHTOKEN
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nsXFormsXPathScanner::ScanQName()
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{
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XPATHTOKEN second = NONE;
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ScanNCName();
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if (PeekChar() == ':' && PeekChar(mOffset + mLength + 2) != ':') {
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PopChar();
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second = ScanNCName();
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}
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nsDependentSubstring image = Substring(mExpression, Offset() + 1);
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if (SolveDiambiguate()) {
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if (StringBeginsWith(image, NS_LITERAL_STRING("and")))
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return AND;
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if (StringBeginsWith(image, NS_LITERAL_STRING("or")))
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return OR;
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if (StringBeginsWith(image, NS_LITERAL_STRING("mod")))
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return MOD;
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if (StringBeginsWith(image, NS_LITERAL_STRING("div")))
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return DIV;
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return ERRORXPATHTOKEN;
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}
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PRUnichar c = NextNonWhite();
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if (c == '(') {
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if (StringBeginsWith(image, NS_LITERAL_STRING("comment")))
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return COMMENT;
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if (StringBeginsWith(image, NS_LITERAL_STRING("text")))
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return TEXT;
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if (StringBeginsWith(image, NS_LITERAL_STRING("processing-instruction")))
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return PI;
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if (StringBeginsWith(image, NS_LITERAL_STRING("node")))
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return NODE;
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return FUNCTIONNAME;
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}
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PRInt32 of = GetOffsetForNonWhite();
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if (PeekChar(of) == ':' && PeekChar(of + 1) == ':') {
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if (StringBeginsWith(image, NS_LITERAL_STRING("ancestor")))
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return ANCESTOR;
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if (StringBeginsWith(image, NS_LITERAL_STRING("ancestor-or-self")))
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return ANCESTOR_OR_SELF;
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if (StringBeginsWith(image, NS_LITERAL_STRING("attribute")))
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return ATTRIBUTE;
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if (StringBeginsWith(image, NS_LITERAL_STRING("child")))
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return CHILD;
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if (StringBeginsWith(image, NS_LITERAL_STRING("descendant")))
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return DESCENDANT;
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if (StringBeginsWith(image, NS_LITERAL_STRING("descendant-or-self")))
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return DESCENDANT_OR_SELF;
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if (StringBeginsWith(image, NS_LITERAL_STRING("following")))
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return FOLLOWING;
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if (StringBeginsWith(image, NS_LITERAL_STRING("following-sibling")))
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return FOLLOWING_SIBLING;
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if (StringBeginsWith(image, NS_LITERAL_STRING("namespace")))
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return NAMESPACE;
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if (StringBeginsWith(image, NS_LITERAL_STRING("parent")))
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return PARENT;
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if (StringBeginsWith(image, NS_LITERAL_STRING("preceding")))
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return PRECEDING;
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if (StringBeginsWith(image, NS_LITERAL_STRING("preceding-sibling")))
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return PRECEDING_SIBLING;
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if (StringBeginsWith(image, NS_LITERAL_STRING("self")))
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return SELF;
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return ERRORXPATHTOKEN;
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}
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return second != NONE ? QNAME : NCNAME;
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}
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nsXFormsXPathScanner::XPATHTOKEN
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nsXFormsXPathScanner::ScanNCName()
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{
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PRUnichar c = PopChar();
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if (c != '_' && !nsXFormsXPathXMLUtil::IsLetter(c)) {
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return ERRORXPATHTOKEN;
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}
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while (nsXFormsXPathXMLUtil::IsNCNameChar(PeekChar())) {
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PopChar();
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}
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return NCNAME;
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}
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