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//
// Copyright (C) 2016 Google, Inc.
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
//
// Neither the name of Google, Inc., nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
#ifndef HLSLTOKENSTREAM_H_
#define HLSLTOKENSTREAM_H_
#include "hlslScanContext.h"
namespace glslang {
class HlslTokenStream {
public:
explicit HlslTokenStream(HlslScanContext& scanner)
: scanner(scanner), preTokenStackSize(0), tokenBufferPos(0) { }
virtual ~HlslTokenStream() { }
public:
void advanceToken();
void recedeToken();
bool acceptTokenClass(EHlslTokenClass);
EHlslTokenClass peek() const;
bool peekTokenClass(EHlslTokenClass) const;
glslang::TBuiltInVariable mapSemantic(const char* upperCase) { return scanner.mapSemantic(upperCase); }
void pushTokenStream(const TVector<HlslToken>* tokens);
void popTokenStream();
protected:
HlslToken token; // the token we are currently looking at, but have not yet accepted
private:
HlslTokenStream();
HlslTokenStream& operator=(const HlslTokenStream&);
HlslScanContext& scanner; // lexical scanner, to get next token from source file
TVector<const TVector<HlslToken>*> tokenStreamStack; // for getting the next token from an existing vector of tokens
TVector<int> tokenPosition;
TVector<HlslToken> currentTokenStack;
// This is the number of tokens we can recedeToken() over.
static const int tokenBufferSize = 2;
// Previously scanned tokens, returned for future advances,
// so logically in front of the token stream.
// Is logically a stack; needs last in last out semantics.
// Currently implemented as a stack of size 2.
HlslToken preTokenStack[tokenBufferSize];
int preTokenStackSize;
void pushPreToken(const HlslToken&);
HlslToken popPreToken();
// Previously scanned tokens, not yet returned for future advances,
// but available for that.
// Is logically a fifo for normal advances, and a stack for recession.
// Currently implemented with an intrinsic size of 2.
HlslToken tokenBuffer[tokenBufferSize];
int tokenBufferPos;
void pushTokenBuffer(const HlslToken&);
HlslToken popTokenBuffer();
};
} // end namespace glslang
#endif // HLSLTOKENSTREAM_H_
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