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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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