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//
//Copyright (C) 2016 Google, Inc.
//
//All rights reserved.
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//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.
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// copyright notice, this list of conditions and the following
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// with the distribution.
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//LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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#ifndef HLSLTOKENSTREAM_H_
#define HLSLTOKENSTREAM_H_
#include "hlslScanContext.h"
namespace glslang {
class HlslTokenStream {
public:
explicit HlslTokenStream(HlslScanContext& scanner)
: scanner(scanner), preTokenStackSize(0) { }
virtual ~HlslTokenStream() { }
public:
void advanceToken();
void recedeToken();
bool acceptTokenClass(EHlslTokenClass);
EHlslTokenClass peek() const;
bool peekTokenClass(EHlslTokenClass) const;
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
// 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 1.
HlslToken preTokenStack;
int preTokenStackSize;
void pushPreToken(const HlslToken&);
HlslToken popPreToken();
// Previously scanned tokens, not yet return 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 1.
HlslToken tokenBuffer;
void pushTokenBuffer(const HlslToken&);
HlslToken popTokenBuffer();
};
} // end namespace glslang
#endif // HLSLTOKENSTREAM_H_