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scan.c - Hosted on DriveHQ Cloud IT Platform
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路径: \\game3dprogramming\materials\DarkPuzzle\libs\bullet_sdk\jam-2.5\scan.c
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/* * Copyright 1993-2002 Christopher Seiwald and Perforce Software, Inc. * * This file is part of Jam - see jam.c for Copyright information. */ /* * scan.c - the jam yacc scanner * * 12/26/93 (seiwald) - bump buf in yylex to 10240 - yuk. * 09/16/94 (seiwald) - check for overflows, unmatched {}'s, etc. * Also handle tokens abutting EOF by remembering * to return EOF now matter how many times yylex() * reinvokes yyline(). * 02/11/95 (seiwald) - honor only punctuation keywords if SCAN_PUNCT. * 07/27/95 (seiwald) - Include jamgram.h after scan.h, so that YYSTYPE is * defined before Linux's yacc tries to redefine it. * 01/10/01 (seiwald) - \ can now escape any whitespace char * 11/04/02 (seiwald) - const-ing for string literals */ # include "jam.h" # include "lists.h" # include "parse.h" # include "scan.h" # include "jamgram.h" # include "jambase.h" # include "newstr.h" struct keyword { const char *word; int type; } keywords[] = { # include "jamgramtab.h" { 0, 0 } } ; struct include { struct include *next; /* next serial include file */ const char *string; /* pointer into current line */ char **strings; /* for yyfparse() -- text to parse */ FILE *file; /* for yyfparse() -- file being read */ const char *fname; /* for yyfparse() -- file name */ int line; /* line counter for error messages */ char buf[ 512 ]; /* for yyfparse() -- line buffer */ } ; static struct include *incp = 0; /* current file; head of chain */ static int scanmode = SCAN_NORMAL; static int anyerrors = 0; static char *symdump( YYSTYPE *s ); # define BIGGEST_TOKEN 10240 /* no single token can be larger */ /* * Set parser mode: normal, string, or keyword */ void yymode( int n ) { scanmode = n; } void yyerror( const char *s ) { if( incp ) printf( "%s: line %d: ", incp->fname, incp->line ); printf( "%s at %s\n", s, symdump( &yylval ) ); ++anyerrors; } int yyanyerrors() { return anyerrors != 0; } void yyfparse( const char *s ) { struct include *i = (struct include *)malloc( sizeof( *i ) ); /* Push this onto the incp chain. */ i->string = ""; i->strings = 0; i->file = 0; i->fname = copystr( s ); i->line = 0; i->next = incp; incp = i; /* If the filename is "+", it means use the internal jambase. */ if( !strcmp( s, "+" ) ) i->strings = jambase; } /* * yyline() - read new line and return first character * * Fabricates a continuous stream of characters across include files, * returning EOF at the bitter end. */ int yyline() { struct include *i = incp; if( !incp ) return EOF; /* Once we start reading from the input stream, we reset the */ /* include insertion point so that the next include file becomes */ /* the head of the list. */ /* If there is more data in this line, return it. */ if( *i->string ) return *i->string++; /* If we're reading from an internal string list, go to the */ /* next string. */ if( i->strings ) { if( !*i->strings ) goto next; i->line++; i->string = *(i->strings++); return *i->string++; } /* If necessary, open the file */ if( !i->file ) { FILE *f = stdin; if( strcmp( i->fname, "-" ) && !( f = fopen( i->fname, "r" ) ) ) perror( i->fname ); i->file = f; } /* If there's another line in this file, start it. */ if( i->file && fgets( i->buf, sizeof( i->buf ), i->file ) ) { i->line++; i->string = i->buf; return *i->string++; } next: /* This include is done. */ /* Free it up and return EOF so yyparse() returns to parse_file(). */ incp = i->next; /* Close file, free name */ if( i->file && i->file != stdin ) fclose( i->file ); freestr( i->fname ); free( (char *)i ); return EOF; } /* * yylex() - set yylval to current token; return its type * * Macros to move things along: * * yychar() - return and advance character; invalid after EOF * yyprev() - back up one character; invalid before yychar() * * yychar() returns a continuous stream of characters, until it hits * the EOF of the current include file. */ # define yychar() ( *incp->string ? *incp->string++ : yyline() ) # define yyprev() ( incp->string-- ) int yylex() { int c; char buf[BIGGEST_TOKEN]; char *b = buf; if( !incp ) goto eof; /* Get first character (whitespace or of token) */ c = yychar(); if( scanmode == SCAN_STRING ) { /* If scanning for a string (action's {}'s), look for the */ /* closing brace. We handle matching braces, if they match! */ int nest = 1; while( c != EOF && b < buf + sizeof( buf ) ) { if( c == '{' ) nest++; if( c == '}' && !--nest ) break; *b++ = c; c = yychar(); } /* We ate the ending brace -- regurgitate it. */ if( c != EOF ) yyprev(); /* Check obvious errors. */ if( b == buf + sizeof( buf ) ) { yyerror( "action block too big" ); goto eof; } if( nest ) { yyerror( "unmatched {} in action block" ); goto eof; } *b = 0; yylval.type = STRING; yylval.string = newstr( buf ); } else { char *b = buf; struct keyword *k; int inquote = 0; int notkeyword; /* Eat white space */ for( ;; ) { /* Skip past white space */ while( c != EOF && isspace( c ) ) c = yychar(); /* Not a comment? Swallow up comment line. */ if( c != '#' ) break; while( ( c = yychar() ) != EOF && c != '\n' ) ; } /* c now points to the first character of a token. */ if( c == EOF ) goto eof; /* While scanning the word, disqualify it for (expensive) */ /* keyword lookup when we can: $anything, "anything", \anything */ notkeyword = c == '$'; /* look for white space to delimit word */ /* "'s get stripped but preserve white space */ /* \ protects next character */ while( c != EOF && b < buf + sizeof( buf ) && ( inquote || !isspace( c ) ) ) { if( c == '"' ) { /* begin or end " */ inquote = !inquote; notkeyword = 1; } else if( c != '\\' ) { /* normal char */ *b++ = c; } else if( ( c = yychar()) != EOF ) { /* \c */ *b++ = c; notkeyword = 1; } else { /* \EOF */ break; } c = yychar(); } /* Check obvious errors. */ if( b == buf + sizeof( buf ) ) { yyerror( "string too big" ); goto eof; } if( inquote ) { yyerror( "unmatched \" in string" ); goto eof; } /* We looked ahead a character - back up. */ if( c != EOF ) yyprev(); /* scan token table */ /* don't scan if it's obviously not a keyword or if its */ /* an alphabetic when were looking for punctuation */ *b = 0; yylval.type = ARG; if( !notkeyword && !( isalpha( *buf ) && scanmode == SCAN_PUNCT ) ) { for( k = keywords; k->word; k++ ) if( *buf == *k->word && !strcmp( k->word, buf ) ) { yylval.type = k->type; yylval.string = k->word; /* used by symdump */ break; } } if( yylval.type == ARG ) yylval.string = newstr( buf ); } if( DEBUG_SCAN ) printf( "scan %s\n", symdump( &yylval ) ); return yylval.type; eof: yylval.type = EOF; return yylval.type; } static char * symdump( YYSTYPE *s ) { static char buf[ BIGGEST_TOKEN + 20 ]; switch( s->type ) { case EOF: sprintf( buf, "EOF" ); break; case 0: sprintf( buf, "unknown symbol %s", s->string ); break; case ARG: sprintf( buf, "argument %s", s->string ); break; case STRING: sprintf( buf, "string \"%s\"", s->string ); break; default: sprintf( buf, "keyword %s", s->string ); break; } return buf; }
scan.c
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