diff options
Diffstat (limited to 'src/VBox/Devices/EFI/Firmware/BaseTools/Source/C/VfrCompile/Pccts/h/ATokenBuffer.h')
-rw-r--r-- | src/VBox/Devices/EFI/Firmware/BaseTools/Source/C/VfrCompile/Pccts/h/ATokenBuffer.h | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/src/VBox/Devices/EFI/Firmware/BaseTools/Source/C/VfrCompile/Pccts/h/ATokenBuffer.h b/src/VBox/Devices/EFI/Firmware/BaseTools/Source/C/VfrCompile/Pccts/h/ATokenBuffer.h new file mode 100644 index 00000000..a6bec639 --- /dev/null +++ b/src/VBox/Devices/EFI/Firmware/BaseTools/Source/C/VfrCompile/Pccts/h/ATokenBuffer.h @@ -0,0 +1,109 @@ +/* ANTLRTokenBuffer.h + * + * SOFTWARE RIGHTS + * + * We reserve no LEGAL rights to the Purdue Compiler Construction Tool + * Set (PCCTS) -- PCCTS is in the public domain. An individual or + * company may do whatever they wish with source code distributed with + * PCCTS or the code generated by PCCTS, including the incorporation of + * PCCTS, or its output, into commerical software. + * + * We encourage users to develop software with PCCTS. However, we do ask + * that credit is given to us for developing PCCTS. By "credit", + * we mean that if you incorporate our source code into one of your + * programs (commercial product, research project, or otherwise) that you + * acknowledge this fact somewhere in the documentation, research report, + * etc... If you like PCCTS and have developed a nice tool with the + * output, please mention that you developed it using PCCTS. In + * addition, we ask that this header remain intact in our source code. + * As long as these guidelines are kept, we expect to continue enhancing + * this system and expect to make other tools available as they are + * completed. + * + * ANTLR 1.33 + * Terence Parr + * Parr Research Corporation + * with Purdue University and AHPCRC, University of Minnesota + * 1989-2000 + */ + +#ifndef ATOKENBUFFER_H_GATE +#define ATOKENBUFFER_H_GATE + +#include "pcctscfg.h" + +#include "pccts_stdlib.h" + +PCCTS_NAMESPACE_STD + +#include ATOKEN_H +#include ATOKENSTREAM_H + +/* + * The parser is "attached" to an ANTLRTokenBuffer via interface + * functions: getToken() and bufferedToken(). The object that actually + * consumes characters and constructs tokens is connected to the + * ANTLRTokenBuffer via interface function ANTLRTokenStream::getToken(); + * where ANTLRTokenStream is really just a behavior (class with no data). + * C++ does not have this abstraction and hence we simply have come up + * with a fancy name for "void *". See the note in ANTLRTokenStream.h on + * the "behavior" of ANTLRTokenStream. + */ + +class ANTLRParser; // MR1 + +class DllExportPCCTS ANTLRTokenBuffer { +protected: + ANTLRTokenStream *input; // where do I get tokens + int buffer_size; + int chunk_size; + int num_markers; + int k; // Need at least this many tokens in buffer + _ANTLRTokenPtr *buffer; // buffer used for arbitrary lookahead + _ANTLRTokenPtr *tp; // pts into buffer; current token ptr + _ANTLRTokenPtr *last; // pts to last valid token in buffer + _ANTLRTokenPtr *next; // place to put token from getANTLRToken() + _ANTLRTokenPtr *end_of_buffer; + /* when you try to write a token past this and there are no markers + set, then move k-1 tokens back to the beginning of the buffer. + We want to stay away from the end of the buffer because we have + to extend it if a marker is set and we reach the end (we cannot + move tokens to the beginning of the buffer in this case). + */ + _ANTLRTokenPtr *threshold; + unsigned char _deleteTokens; + + // This function is filled in by the subclass; it initiates fetch of input + virtual _ANTLRTokenPtr getANTLRToken() { return input->getToken(); } + void makeRoom(); + void extendBuffer(); + +public: + ANTLRTokenBuffer(ANTLRTokenStream *in, int k=1, int chksz=50); + virtual ~ANTLRTokenBuffer(); + virtual _ANTLRTokenPtr getToken(); + virtual void rewind(int pos); + virtual int mark(); + virtual _ANTLRTokenPtr bufferedToken(int i); + + void noGarbageCollectTokens() { _deleteTokens=0; } + void garbageCollectTokens() { _deleteTokens=1; } + + virtual int bufferSize() { return buffer_size; } + virtual int minTokens() { return k; } + virtual void setMinTokens(int k_new) { k = k_new; } + + virtual void panic(const char *msg); /* MR20 const */ + + virtual int printMessage(FILE* pFile, const char* pFormat, ...); // MR23 + +protected: // MR1 + ANTLRParser *parser; // MR1 +public: // MR1 + ANTLRParser *setParser(ANTLRParser *p); // MR1 + ANTLRParser *getParser(); // MR1 + ANTLRTokenStream *getLexer() const { // MR12 + return input;} // MR12 +}; + +#endif |