151 lines
4.4 KiB
C++
Executable File
151 lines
4.4 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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#include "hlslTokenStream.h"
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namespace glslang {
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void HlslTokenStream::pushPreToken(const HlslToken& tok)
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{
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assert(preTokenStackSize < tokenBufferSize);
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preTokenStack[preTokenStackSize++] = tok;
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}
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HlslToken HlslTokenStream::popPreToken()
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{
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assert(preTokenStackSize > 0);
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return preTokenStack[--preTokenStackSize];
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}
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void HlslTokenStream::pushTokenBuffer(const HlslToken& tok)
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{
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tokenBuffer[tokenBufferPos] = tok;
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tokenBufferPos = (tokenBufferPos+1) % tokenBufferSize;
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}
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HlslToken HlslTokenStream::popTokenBuffer()
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{
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// Back up
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tokenBufferPos = (tokenBufferPos+tokenBufferSize-1) % tokenBufferSize;
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return tokenBuffer[tokenBufferPos];
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}
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//
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// Make a new source of tokens, not from the source, but from an
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// already pre-processed token stream.
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//
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// This interrupts current token processing which must be restored
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// later. Some simplifying assumptions are made (and asserted).
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//
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void HlslTokenStream::pushTokenStream(const TVector<HlslToken>* tokens)
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{
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// not yet setup to interrupt a stream that has been receded
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// and not yet reconsumed
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assert(preTokenStackSize == 0);
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// save current state
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currentTokenStack.push_back(token);
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// set up new token stream
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tokenStreamStack.push_back(tokens);
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// start position at first token:
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token = (*tokens)[0];
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tokenPosition.push_back(0);
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}
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// Undo pushTokenStream(), see above
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void HlslTokenStream::popTokenStream()
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{
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tokenStreamStack.pop_back();
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tokenPosition.pop_back();
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token = currentTokenStack.back();
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currentTokenStack.pop_back();
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}
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// Load 'token' with the next token in the stream of tokens.
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void HlslTokenStream::advanceToken()
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{
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pushTokenBuffer(token);
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if (preTokenStackSize > 0)
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token = popPreToken();
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else {
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if (tokenStreamStack.size() == 0)
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scanner.tokenize(token);
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else {
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++tokenPosition.back();
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if (tokenPosition.back() >= (int)tokenStreamStack.back()->size())
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token.tokenClass = EHTokNone;
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else
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token = (*tokenStreamStack.back())[tokenPosition.back()];
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}
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}
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}
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void HlslTokenStream::recedeToken()
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{
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pushPreToken(token);
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token = popTokenBuffer();
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}
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// Return the current token class.
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EHlslTokenClass HlslTokenStream::peek() const
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{
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return token.tokenClass;
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}
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// Return true, without advancing to the next token, if the current token is
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// the expected (passed in) token class.
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bool HlslTokenStream::peekTokenClass(EHlslTokenClass tokenClass) const
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{
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return peek() == tokenClass;
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}
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// Return true and advance to the next token if the current token is the
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// expected (passed in) token class.
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bool HlslTokenStream::acceptTokenClass(EHlslTokenClass tokenClass)
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{
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if (peekTokenClass(tokenClass)) {
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advanceToken();
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return true;
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}
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return false;
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}
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} // end namespace glslang
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