diff options
Diffstat (limited to 'chromium/third_party/glslang/src/glslang/MachineIndependent/Scan.h')
| -rw-r--r-- | chromium/third_party/glslang/src/glslang/MachineIndependent/Scan.h | 265 |
1 files changed, 265 insertions, 0 deletions
diff --git a/chromium/third_party/glslang/src/glslang/MachineIndependent/Scan.h b/chromium/third_party/glslang/src/glslang/MachineIndependent/Scan.h new file mode 100644 index 00000000000..1cc437cb496 --- /dev/null +++ b/chromium/third_party/glslang/src/glslang/MachineIndependent/Scan.h @@ -0,0 +1,265 @@ +// +//Copyright (C) 2002-2005 3Dlabs Inc. Ltd. +//Copyright (C) 2013 LunarG, 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 3Dlabs Inc. Ltd. 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 _GLSLANG_SCAN_INCLUDED_ +#define _GLSLANG_SCAN_INCLUDED_ + +#include "Versions.h" + +namespace glslang { + +// Use a global end-of-input character, so no tranlation is needed across +// layers of encapsulation. Characters are all 8 bit, and positive, so there is +// no aliasing of character 255 onto -1, for example. +const int EndOfInput = -1; + +// +// A character scanner that seamlessly, on read-only strings, reads across an +// array of strings without assuming null termination. +// +class TInputScanner { +public: + TInputScanner(int n, const char* const s[], size_t L[], const char* const* names = nullptr, int b = 0, int f = 0, bool single = false) : + numSources(n), + sources(reinterpret_cast<const unsigned char* const *>(s)), // up to this point, common usage is "char*", but now we need positive 8-bit characters + lengths(L), currentSource(0), currentChar(0), stringBias(b), finale(f), singleLogical(single), endOfFileReached(false) + { + loc = new TSourceLoc[numSources]; + for (int i = 0; i < numSources; ++i) { + loc[i].init(); + } + if (names != nullptr) { + for (int i = 0; i < numSources; ++i) + loc[i].name = names[i]; + } + loc[currentSource].string = -stringBias; + loc[currentSource].line = 1; + loc[currentSource].column = 0; + logicalSourceLoc.string = 0; + logicalSourceLoc.line = 1; + logicalSourceLoc.column = 0; + logicalSourceLoc.name = loc[0].name; + } + + virtual ~TInputScanner() + { + delete [] loc; + } + + // retrieve the next character and advance one character + int get() + { + int ret = peek(); + if (ret == EndOfInput) return ret; + ++loc[currentSource].column; + ++logicalSourceLoc.column; + if (ret == '\n') { + ++loc[currentSource].line; + ++logicalSourceLoc.line; + logicalSourceLoc.column = 0; + loc[currentSource].column = 0; + } + advance(); + + return ret; + } + + // retrieve the next character, no advance + int peek() + { + if (currentSource >= numSources) { + endOfFileReached = true; + return EndOfInput; + } + // Make sure we do not read off the end of a string. + // N.B. Sources can have a length of 0. + int sourceToRead = currentSource; + size_t charToRead = currentChar; + while(charToRead >= lengths[sourceToRead]) { + charToRead = 0; + sourceToRead += 1; + if (sourceToRead >= numSources) { + return EndOfInput; + } + } + + // Here, we care about making negative valued characters positive + return sources[sourceToRead][charToRead]; + } + + // go back one character + void unget() + { + // Do not roll back once we've reached the end of the file. + if (endOfFileReached) return; + + if (currentChar > 0) { + --currentChar; + --loc[currentSource].column; + --logicalSourceLoc.column; + if (loc[currentSource].column < 0) { + // We've moved back past a new line. Find the + // previous newline (or start of the file) to compute + // the column count on the now current line. + size_t chIndex = currentChar; + while (chIndex > 0) { + if (sources[currentSource][chIndex] == '\n') { + break; + } + --chIndex; + } + logicalSourceLoc.column = (int)(currentChar - chIndex); + loc[currentSource].column = (int)(currentChar - chIndex); + } + } else { + do { + --currentSource; + } while (currentSource > 0 && lengths[currentSource] == 0); + if (lengths[currentSource] == 0) { + // set to 0 if we've backed up to the start of an empty string + currentChar = 0; + } else + currentChar = lengths[currentSource] - 1; + } + if (peek() == '\n') { + --loc[currentSource].line; + --logicalSourceLoc.line; + } + } + + // for #line override + void setLine(int newLine) + { + logicalSourceLoc.line = newLine; + loc[getLastValidSourceIndex()].line = newLine; + } + + // for #line override in filename based parsing + void setFile(const char* filename) + { + logicalSourceLoc.name = filename; + loc[getLastValidSourceIndex()].name = filename; + } + + void setFile(const char* filename, size_t i) + { + if (i == getLastValidSourceIndex()) { + logicalSourceLoc.name = filename; + } + loc[i].name = filename; + } + + void setString(int newString) + { + logicalSourceLoc.string = newString; + loc[getLastValidSourceIndex()].string = newString; + logicalSourceLoc.name = nullptr; + loc[getLastValidSourceIndex()].name = nullptr; + } + + // for #include content indentation + void setColumn(int col) + { + logicalSourceLoc.column = col; + loc[getLastValidSourceIndex()].column = col; + } + + const TSourceLoc& getSourceLoc() const + { + if (singleLogical) { + return logicalSourceLoc; + } else { + return loc[std::max(0, std::min(currentSource, numSources - finale - 1))]; + } + } + // Returns the index (starting from 0) of the most recent valid source string we are reading from. + int getLastValidSourceIndex() const { return std::min(currentSource, numSources - 1); } + + void consumeWhiteSpace(bool& foundNonSpaceTab); + bool consumeComment(); + void consumeWhitespaceComment(bool& foundNonSpaceTab); + bool scanVersion(int& version, EProfile& profile, bool& notFirstToken); + +protected: + + // advance one character + void advance() + { + ++currentChar; + if (currentChar >= lengths[currentSource]) { + ++currentSource; + if (currentSource < numSources) { + loc[currentSource].string = loc[currentSource - 1].string + 1; + loc[currentSource].line = 1; + loc[currentSource].column = 0; + } + while (currentSource < numSources && lengths[currentSource] == 0) { + ++currentSource; + if (currentSource < numSources) { + loc[currentSource].string = loc[currentSource - 1].string + 1; + loc[currentSource].line = 1; + loc[currentSource].column = 0; + } + } + currentChar = 0; + } + } + + int numSources; // number of strings in source + const unsigned char* const *sources; // array of strings; must be converted to positive values on use, to avoid aliasing with -1 as EndOfInput + const size_t *lengths; // length of each string + int currentSource; + size_t currentChar; + + // This is for reporting what string/line an error occurred on, and can be overridden by #line. + // It remembers the last state of each source string as it is left for the next one, so unget() + // can restore that state. + TSourceLoc* loc; // an array + + int stringBias; // the first string that is the user's string number 0 + int finale; // number of internal strings after user's last string + + TSourceLoc logicalSourceLoc; + bool singleLogical; // treats the strings as a single logical string. + // locations will be reported from the first string. + + // set to true once peak() returns EndOfFile, so that we won't roll back + // once we've reached EndOfFile. + bool endOfFileReached; +}; + +} // end namespace glslang + +#endif // _GLSLANG_SCAN_INCLUDED_ |