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