DLexerBase.cpp
资源名称:pccts133.zip [点击查看]
上传用户:itx_2006
上传日期:2007-01-06
资源大小:493k
文件大小:6k
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- /* DLGLexerBase.c
- *
- * 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
- * 1989-1998
- */
- #include "pcctscfg.h"
- #include PCCTS_STDIO_H
- #include PCCTS_STDLIB_H
- PCCTS_NAMESPACE_STD
- /* I have to put this here due to C++ limitation
- * that you can't have a 'forward' decl for enums.
- * I hate C++!!!!!!!!!!!!!!!
- */
- // MR1
- // MR1 10-Apr-97 133MR1 Prevent use of varying sizes for the
- // MR1 ANTLRTokenType enum
- // MR1
- enum ANTLRTokenType { TER_HATES_CPP=0, ITS_UTTER_GARBAGE, // MR1
- WITH_SOME_GOOD_IDEAS=9999}; // MR1
- #define ANTLR_SUPPORT_CODE
- #include "pcctscfg.h"
- #include DLEXERBASE_H
- DLGLexerBase::
- DLGLexerBase(DLGInputStream *in,
- unsigned bufsize,
- int _interactive,
- int _track_columns)
- {
- this->_bufsize = bufsize;
- this->_lextext = new DLGChar[_bufsize];
- if ( this->_lextext==NULL ) {
- panic("text buffer is NULL");
- }
- this->_begexpr = this->_endexpr = NULL;
- this->ch = this->bufovf = 0;
- this->nextpos = NULL;
- this->cl = 0;
- this->add_erase = 0;
- this->input = in;
- this->_begcol = 0;
- this->_endcol = 0;
- this->_line = 1;
- this->charfull = 0;
- this->automaton = 0;
- this->token_to_fill = NULL;
- this->interactive = _interactive;
- this->track_columns = _track_columns;
- this->debugLexerFlag = 0; // MR1
- this->parser = NULL; // MR1
- this->lexErrCount=0; // MR11
- }
- void DLGLexerBase::
- setInputStream( DLGInputStream *in )
- {
- this->input = in;
- _line = 1;
- charfull = 0;
- }
- /* saves dlg state, but not what feeds dlg (such as file position) */
- void DLGLexerBase::
- saveState(DLGState *state)
- {
- state->input = input;
- state->interactive = interactive;
- state->track_columns = track_columns;
- state->auto_num = automaton;
- state->add_erase = add_erase;
- state->lookc = ch;
- state->char_full = charfull;
- state->begcol = _begcol;
- state->endcol = _endcol;
- state->line = _line;
- state->lextext = _lextext;
- state->begexpr = _begexpr;
- state->endexpr = _endexpr;
- state->bufsize = _bufsize;
- state->bufovf = bufovf;
- state->nextpos = nextpos;
- state->class_num = cl;
- state->debugLexerFlag = debugLexerFlag; // MR1
- state->parser = parser; // MR1
- }
- void DLGLexerBase::
- restoreState(DLGState *state)
- {
- input = state->input;
- interactive = state->interactive;
- track_columns = state->track_columns;
- automaton = state->auto_num;
- add_erase = state->add_erase;
- ch = state->lookc;
- charfull = state->char_full;
- _begcol = state->begcol;
- _endcol = state->endcol;
- _line = state->line;
- _lextext = state->lextext;
- _begexpr = state->begexpr;
- _endexpr = state->endexpr;
- _bufsize = state->bufsize;
- bufovf = state->bufovf;
- nextpos = state->nextpos;
- cl = state->class_num;
- debugLexerFlag = state->debugLexerFlag; // MR1
- parser = state->parser; // MR1
- }
- /* erase what is currently in the buffer, and get a new reg. expr */
- void DLGLexerBase::
- skip()
- {
- add_erase = 1;
- }
- /* don't erase what is in the lextext buffer, add on to it */
- void DLGLexerBase::
- more()
- {
- add_erase = 2;
- }
- /* substitute c for the reg. expr last matched and is in the buffer */
- void DLGLexerBase::
- replchar(DLGChar c)
- {
- /* can't allow overwriting null at end of string */
- if (_begexpr < &_lextext[_bufsize-1]){
- *_begexpr = c;
- *(_begexpr+1) = ' ';
- }
- _endexpr = _begexpr;
- nextpos = _begexpr + 1;
- }
- /* replace the string s for the reg. expr last matched and in the buffer */
- void DLGLexerBase::
- replstr(register DLGChar *s)
- {
- register DLGChar *l= &_lextext[_bufsize -1];
- nextpos = _begexpr;
- if (s){
- while ((nextpos <= l) && (*(nextpos++) = *(s++))){
- /* empty */
- }
- /* correct for NULL at end of string */
- nextpos--;
- }
- if ((nextpos <= l) && (*(--s) == 0)){
- bufovf = 0;
- }else{
- bufovf = 1;
- }
- *(nextpos) = ' ';
- _endexpr = nextpos - 1;
- }
- void DLGLexerBase::
- errstd(char *s)
- {
- lexErrCount++; /* MR11 */
- fprintf(stderr,
- "%s near line %d (text was '%s')n",
- ((s == NULL) ? "Lexical error" : s),
- _line,_lextext);
- }
- int DLGLexerBase::
- err_in()
- {
- fprintf(stderr,"No input stream, function, or stringn");
- /* return eof to get out gracefully */
- return EOF;
- }
- ANTLRTokenType DLGLexerBase::
- erraction()
- {
- errstd("invalid token");
- advance();
- skip();
- return (ANTLRTokenType) 0; // bogus, but satisfies compiler
- }
- _ANTLRTokenPtr DLGLexerBase::
- getToken()
- {
- if ( token_to_fill==NULL ) panic("NULL token_to_fill");
- ANTLRTokenType tt = nextTokenType();
- _ANTLRTokenPtr tk = token_to_fill->makeToken(tt, _lextext,_line);
- return tk;
- }
- void DLGLexerBase::
- panic(char *msg)
- {
- fprintf(stderr, "DLG panic: %sn", msg);
- //
- // 7-Apr-97 133MR1
- //
- exit(PCCTS_EXIT_FAILURE); // MR1
- }
- ANTLRParser * DLGLexerBase:: // MR1
- setParser(ANTLRParser *p) { // MR1
- ANTLRParser *oldValue=parser; // MR1
- parser=p; // MR1
- return oldValue; // MR1
- } // MR1
- // MR1
- ANTLRParser * DLGLexerBase:: // MR1
- getParser() { // MR1
- return parser; // MR1
- } // MR1
- // MR1
- int DLGLexerBase:: // MR1
- debugLexer(int newValue) { // MR1
- int oldValue=debugLexerFlag; // MR1
- debugLexerFlag=newValue; // MR1
- return oldValue; // MR1
- } // MR1