1 // 2 // Copyright (C) 2016 Google, Inc. 3 // 4 // All rights reserved. 5 // 6 // Redistribution and use in source and binary forms, with or without 7 // modification, are permitted provided that the following conditions 8 // are met: 9 // 10 // Redistributions of source code must retain the above copyright 11 // notice, this list of conditions and the following disclaimer. 12 // 13 // Redistributions in binary form must reproduce the above 14 // copyright notice, this list of conditions and the following 15 // disclaimer in the documentation and/or other materials provided 16 // with the distribution. 17 // 18 // Neither the name of Google, Inc., nor the names of its 19 // contributors may be used to endorse or promote products derived 20 // from this software without specific prior written permission. 21 // 22 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 24 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 25 // FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 26 // COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 27 // INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 28 // BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 29 // LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 30 // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 // LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 32 // ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 // POSSIBILITY OF SUCH DAMAGE. 34 // 35 36 #ifndef HLSLTOKENSTREAM_H_ 37 #define HLSLTOKENSTREAM_H_ 38 39 #include "hlslScanContext.h" 40 41 namespace glslang { 42 43 class HlslTokenStream { 44 public: 45 explicit HlslTokenStream(HlslScanContext& scanner) 46 : scanner(scanner), preTokenStackSize(0), tokenBufferPos(0) { } 47 virtual ~HlslTokenStream() { } 48 49 public: 50 void advanceToken(); 51 void recedeToken(); 52 bool acceptTokenClass(EHlslTokenClass); 53 EHlslTokenClass peek() const; 54 bool peekTokenClass(EHlslTokenClass) const; 55 glslang::TBuiltInVariable mapSemantic(const char* upperCase) { return scanner.mapSemantic(upperCase); } 56 57 void pushTokenStream(const TVector<HlslToken>* tokens); 58 void popTokenStream(); 59 60 protected: 61 HlslToken token; // the token we are currently looking at, but have not yet accepted 62 63 private: 64 HlslTokenStream(); 65 HlslTokenStream& operator=(const HlslTokenStream&); 66 67 HlslScanContext& scanner; // lexical scanner, to get next token from source file 68 TVector<const TVector<HlslToken>*> tokenStreamStack; // for getting the next token from an existing vector of tokens 69 TVector<int> tokenPosition; 70 TVector<HlslToken> currentTokenStack; 71 72 // This is the number of tokens we can recedeToken() over. 73 static const int tokenBufferSize = 2; 74 75 // Previously scanned tokens, returned for future advances, 76 // so logically in front of the token stream. 77 // Is logically a stack; needs last in last out semantics. 78 // Currently implemented as a stack of size 2. 79 HlslToken preTokenStack[tokenBufferSize]; 80 int preTokenStackSize; 81 void pushPreToken(const HlslToken&); 82 HlslToken popPreToken(); 83 84 // Previously scanned tokens, not yet returned for future advances, 85 // but available for that. 86 // Is logically a fifo for normal advances, and a stack for recession. 87 // Currently implemented with an intrinsic size of 2. 88 HlslToken tokenBuffer[tokenBufferSize]; 89 int tokenBufferPos; 90 void pushTokenBuffer(const HlslToken&); 91 HlslToken popTokenBuffer(); 92 }; 93 94 } // end namespace glslang 95 96 #endif // HLSLTOKENSTREAM_H_ 97
