| // |
| // Copyright (C) 2002-2005 3Dlabs Inc. Ltd. |
| // Copyright (C) 2013 LunarG, Inc. |
| // Copyright (C) 2015-2018 Google, Inc. |
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| /****************************************************************************\ |
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| |
| // |
| // For recording and playing back the stream of tokens in a macro definition. |
| // |
| |
| #ifndef _CRT_SECURE_NO_WARNINGS |
| #define _CRT_SECURE_NO_WARNINGS |
| #endif |
| #if (defined(_MSC_VER) && _MSC_VER < 1900 /*vs2015*/) |
| #define snprintf sprintf_s |
| #endif |
| |
| #include <cassert> |
| #include <cstdlib> |
| #include <cstring> |
| #include <cctype> |
| |
| #include "PpContext.h" |
| #include "PpTokens.h" |
| |
| namespace glslang { |
| |
| // Add a token (including backing string) to the end of a macro |
| // token stream, for later playback. |
| void TPpContext::TokenStream::putToken(int atom, TPpToken* ppToken) |
| { |
| TokenStream::Token streamToken(atom, *ppToken); |
| stream.push_back(streamToken); |
| } |
| |
| // Read the next token from a macro token stream. |
| int TPpContext::TokenStream::getToken(TParseContextBase& parseContext, TPpToken *ppToken) |
| { |
| if (atEnd()) |
| return EndOfInput; |
| |
| int atom = stream[currentPos++].get(*ppToken); |
| ppToken->loc = parseContext.getCurrentLoc(); |
| |
| #ifndef GLSLANG_WEB |
| // Check for ##, unless the current # is the last character |
| if (atom == '#') { |
| if (peekToken('#')) { |
| parseContext.requireProfile(ppToken->loc, ~EEsProfile, "token pasting (##)"); |
| parseContext.profileRequires(ppToken->loc, ~EEsProfile, 130, 0, "token pasting (##)"); |
| currentPos++; |
| atom = PpAtomPaste; |
| } |
| } |
| #endif |
| |
| return atom; |
| } |
| |
| // We are pasting if |
| // 1. we are preceding a pasting operator within this stream |
| // or |
| // 2. the entire macro is preceding a pasting operator (lastTokenPastes) |
| // and we are also on the last token |
| bool TPpContext::TokenStream::peekTokenizedPasting(bool lastTokenPastes) |
| { |
| // 1. preceding ##? |
| |
| size_t savePos = currentPos; |
| // skip white space |
| while (peekToken(' ')) |
| ++currentPos; |
| if (peekToken(PpAtomPaste)) { |
| currentPos = savePos; |
| return true; |
| } |
| |
| // 2. last token and we've been told after this there will be a ## |
| |
| if (! lastTokenPastes) |
| return false; |
| // Getting here means the last token will be pasted, after this |
| |
| // Are we at the last non-whitespace token? |
| savePos = currentPos; |
| bool moreTokens = false; |
| do { |
| if (atEnd()) |
| break; |
| if (!peekToken(' ')) { |
| moreTokens = true; |
| break; |
| } |
| ++currentPos; |
| } while (true); |
| currentPos = savePos; |
| |
| return !moreTokens; |
| } |
| |
| // See if the next non-white-space tokens are two consecutive # |
| bool TPpContext::TokenStream::peekUntokenizedPasting() |
| { |
| // don't return early, have to restore this |
| size_t savePos = currentPos; |
| |
| // skip white-space |
| while (peekToken(' ')) |
| ++currentPos; |
| |
| // check for ## |
| bool pasting = false; |
| if (peekToken('#')) { |
| ++currentPos; |
| if (peekToken('#')) |
| pasting = true; |
| } |
| |
| currentPos = savePos; |
| |
| return pasting; |
| } |
| |
| void TPpContext::pushTokenStreamInput(TokenStream& ts, bool prepasting) |
| { |
| pushInput(new tTokenInput(this, &ts, prepasting)); |
| ts.reset(); |
| } |
| |
| int TPpContext::tUngotTokenInput::scan(TPpToken* ppToken) |
| { |
| if (done) |
| return EndOfInput; |
| |
| int ret = token; |
| *ppToken = lval; |
| done = true; |
| |
| return ret; |
| } |
| |
| void TPpContext::UngetToken(int token, TPpToken* ppToken) |
| { |
| pushInput(new tUngotTokenInput(this, token, ppToken)); |
| } |
| |
| } // end namespace glslang |