gecko/xpcom/ds/nsWhitespaceTokenizer.h

111 lines
2.8 KiB
C++

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef __nsWhitespaceTokenizer_h
#define __nsWhitespaceTokenizer_h
#include "mozilla/RangedPtr.h"
#include "nsDependentSubstring.h"
class nsWhitespaceTokenizer
{
public:
nsWhitespaceTokenizer(const nsSubstring& aSource)
: mIter(aSource.Data(), aSource.Length()),
mEnd(aSource.Data() + aSource.Length(), aSource.Data(),
aSource.Length())
{
while (mIter < mEnd && isWhitespace(*mIter)) {
++mIter;
}
}
/**
* Checks if any more tokens are available.
*/
bool hasMoreTokens()
{
return mIter < mEnd;
}
/**
* Returns the next token.
*/
const nsDependentSubstring nextToken()
{
const mozilla::RangedPtr<const PRUnichar> tokenStart = mIter;
while (mIter < mEnd && !isWhitespace(*mIter)) {
++mIter;
}
const mozilla::RangedPtr<const PRUnichar> tokenEnd = mIter;
while (mIter < mEnd && isWhitespace(*mIter)) {
++mIter;
}
return Substring(tokenStart.get(), tokenEnd.get());
}
private:
mozilla::RangedPtr<const PRUnichar> mIter;
const mozilla::RangedPtr<const PRUnichar> mEnd;
bool isWhitespace(PRUnichar aChar)
{
return aChar <= ' ' &&
(aChar == ' ' || aChar == '\n' ||
aChar == '\r'|| aChar == '\t');
}
};
class nsCWhitespaceTokenizer
{
public:
nsCWhitespaceTokenizer(const nsCSubstring& aSource)
: mIter(aSource.Data(), aSource.Length()),
mEnd(aSource.Data() + aSource.Length(), aSource.Data(),
aSource.Length())
{
while (mIter < mEnd && isWhitespace(*mIter)) {
++mIter;
}
}
/**
* Checks if any more tokens are available.
*/
bool hasMoreTokens()
{
return mIter < mEnd;
}
/**
* Returns the next token.
*/
const nsDependentCSubstring nextToken()
{
const mozilla::RangedPtr<const char> tokenStart = mIter;
while (mIter < mEnd && !isWhitespace(*mIter)) {
++mIter;
}
const mozilla::RangedPtr<const char> tokenEnd = mIter;
while (mIter < mEnd && isWhitespace(*mIter)) {
++mIter;
}
return Substring(tokenStart.get(), tokenEnd.get());
}
private:
mozilla::RangedPtr<const char> mIter;
const mozilla::RangedPtr<const char> mEnd;
bool isWhitespace(char aChar)
{
return aChar <= ' ' &&
(aChar == ' ' || aChar == '\n' ||
aChar == '\r'|| aChar == '\t');
}
};
#endif /* __nsWhitespaceTokenizer_h */