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260 lines
8.3 KiB
C++
260 lines
8.3 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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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 TransforMiiX XSLT processor 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) 2002
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Peter Van der Beken <peterv@propagandism.org>
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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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#ifndef __nsCharSeparatedTokenizer_h
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#define __nsCharSeparatedTokenizer_h
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#include "nsDependentSubstring.h"
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#include "nsCRT.h"
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/**
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* This parses a SeparatorChar-separated string into tokens.
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* Whitespace surrounding tokens is not treated as part of tokens, however
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* whitespace inside a token is. If the final token is the empty string, it is
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* not returned.
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*
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* Some examples, with SeparatorChar = ',':
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*
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* "foo, bar, baz" -> "foo" "bar" "baz"
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* "foo,bar,baz" -> "foo" "bar" "baz"
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* "foo , bar hi , baz" -> "foo" "bar hi" "baz"
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* "foo, ,bar,baz" -> "foo" "" "bar" "baz"
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* "foo,,bar,baz" -> "foo" "" "bar" "baz"
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* "foo,bar,baz," -> "foo" "bar" "baz"
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*
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* The function used for whitespace detection is a template argument.
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* By default, it is NS_IsAsciiWhitespace.
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*/
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template<bool IsWhitespace(PRUnichar) = NS_IsAsciiWhitespace>
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class nsCharSeparatedTokenizerTemplate
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{
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public:
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// Flags -- only one for now. If we need more, they should be defined to
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// be 1<<1, 1<<2, etc. (They're masks, and aFlags/mFlags are bitfields.)
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enum {
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SEPARATOR_OPTIONAL = 1
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};
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nsCharSeparatedTokenizerTemplate(const nsSubstring& aSource,
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PRUnichar aSeparatorChar,
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PRUint32 aFlags = 0)
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: mFirstTokenBeganWithWhitespace(false),
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mLastTokenEndedWithWhitespace(false),
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mLastTokenEndedWithSeparator(false),
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mSeparatorChar(aSeparatorChar),
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mFlags(aFlags)
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{
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aSource.BeginReading(mIter);
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aSource.EndReading(mEnd);
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// Skip initial whitespace
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while (mIter != mEnd && IsWhitespace(*mIter)) {
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mFirstTokenBeganWithWhitespace = true;
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++mIter;
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}
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}
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/**
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* Checks if any more tokens are available.
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*/
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bool hasMoreTokens()
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{
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NS_ASSERTION(mIter == mEnd || !IsWhitespace(*mIter),
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"Should be at beginning of token if there is one");
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return mIter != mEnd;
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}
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bool firstTokenBeganWithWhitespace() const
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{
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return mFirstTokenBeganWithWhitespace;
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}
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bool lastTokenEndedWithSeparator() const
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{
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return mLastTokenEndedWithSeparator;
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}
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bool lastTokenEndedWithWhitespace() const
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{
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return mLastTokenEndedWithWhitespace;
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}
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/**
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* Returns the next token.
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*/
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const nsDependentSubstring nextToken()
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{
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nsSubstring::const_char_iterator end = mIter, begin = mIter;
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NS_ASSERTION(mIter == mEnd || !IsWhitespace(*mIter),
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"Should be at beginning of token if there is one");
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// Search until we hit separator or end (or whitespace, if separator
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// isn't required -- see clause with 'break' below).
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while (mIter != mEnd && *mIter != mSeparatorChar) {
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// Skip to end of current word.
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while (mIter != mEnd &&
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!IsWhitespace(*mIter) && *mIter != mSeparatorChar) {
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++mIter;
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}
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end = mIter;
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// Skip whitespace after current word.
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mLastTokenEndedWithWhitespace = false;
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while (mIter != mEnd && IsWhitespace(*mIter)) {
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mLastTokenEndedWithWhitespace = true;
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++mIter;
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}
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if (mFlags & SEPARATOR_OPTIONAL) {
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// We've hit (and skipped) whitespace, and that's sufficient to end
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// our token, regardless of whether we've reached a SeparatorChar.
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break;
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} // (else, we'll keep looping until we hit mEnd or SeparatorChar)
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}
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mLastTokenEndedWithSeparator = (mIter != mEnd &&
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*mIter == mSeparatorChar);
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NS_ASSERTION((mFlags & SEPARATOR_OPTIONAL) ||
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(mLastTokenEndedWithSeparator == (mIter != mEnd)),
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"If we require a separator and haven't hit the end of "
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"our string, then we shouldn't have left the loop "
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"unless we hit a separator");
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// Skip separator (and any whitespace after it), if we're at one.
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if (mLastTokenEndedWithSeparator) {
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++mIter;
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while (mIter != mEnd && IsWhitespace(*mIter)) {
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++mIter;
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}
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}
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return Substring(begin, end);
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}
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private:
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nsSubstring::const_char_iterator mIter, mEnd;
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bool mFirstTokenBeganWithWhitespace;
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bool mLastTokenEndedWithWhitespace;
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bool mLastTokenEndedWithSeparator;
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PRUnichar mSeparatorChar;
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PRUint32 mFlags;
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};
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class nsCharSeparatedTokenizer: public nsCharSeparatedTokenizerTemplate<>
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{
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public:
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nsCharSeparatedTokenizer(const nsSubstring& aSource,
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PRUnichar aSeparatorChar,
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PRUint32 aFlags = 0)
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: nsCharSeparatedTokenizerTemplate<>(aSource, aSeparatorChar, aFlags)
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{
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}
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};
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class nsCCharSeparatedTokenizer
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{
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public:
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nsCCharSeparatedTokenizer(const nsCSubstring& aSource,
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char aSeparatorChar)
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: mSeparatorChar(aSeparatorChar)
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{
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aSource.BeginReading(mIter);
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aSource.EndReading(mEnd);
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while (mIter != mEnd && isWhitespace(*mIter)) {
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++mIter;
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}
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}
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/**
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* Checks if any more tokens are available.
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*/
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bool hasMoreTokens()
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{
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return mIter != mEnd;
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}
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/**
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* Returns the next token.
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*/
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const nsDependentCSubstring nextToken()
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{
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nsCSubstring::const_char_iterator end = mIter, begin = mIter;
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// Search until we hit separator or end.
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while (mIter != mEnd && *mIter != mSeparatorChar) {
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while (mIter != mEnd &&
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!isWhitespace(*mIter) && *mIter != mSeparatorChar) {
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++mIter;
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}
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end = mIter;
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while (mIter != mEnd && isWhitespace(*mIter)) {
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++mIter;
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}
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}
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// Skip separator (and any whitespace after it).
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if (mIter != mEnd) {
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NS_ASSERTION(*mIter == mSeparatorChar, "Ended loop too soon");
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++mIter;
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while (mIter != mEnd && isWhitespace(*mIter)) {
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++mIter;
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}
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}
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return Substring(begin, end);
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}
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private:
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nsCSubstring::const_char_iterator mIter, mEnd;
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char mSeparatorChar;
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bool isWhitespace(unsigned char aChar)
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{
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return aChar <= ' ' &&
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(aChar == ' ' || aChar == '\n' ||
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aChar == '\r'|| aChar == '\t');
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}
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};
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#endif /* __nsCharSeparatedTokenizer_h */
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