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Text File | 1995-06-01 | 5.3 KB | 273 lines | [TEXT/MPS ] |
- #include <stdlib.h>
- #include <stdio.h>
- #include <string.h>
-
- #define ADDEQ 257
- #define ANDAND 258
- #define ANDEQ 259
- #define ARRAY 260
- #define ASM 261
- #define AUTO 262
- #define BREAK 263
- #define CASE 264
- #define CHAR 265
- #define CONST 266
- #define CONTINUE 267
- #define DECR 268
- #define DEFAULT 269
- #define DEREF 270
- #define DIVEQ 271
- #define DO 272
- #define DOUBLE 273
- #define ELLIPSIS 274
- #define ELSE 275
- #define ENUM 276
- #define EQL 277
- #define EXTERN 278
- #define FCON 279
- #define FLOAT 280
- #define FOR 281
- #define FUNCTION 282
- #define GEQ 283
- #define GOTO 284
- #define ICON 285
- #define ID 286
- #define IF 287
- #define INCR 288
- #define INT 289
- #define LEQ 290
- #define LONG 291
- #define LSHIFT 292
- #define LSHIFTEQ 293
- #define MODEQ 294
- #define MULEQ 295
- #define NEQ 296
- #define OREQ 297
- #define OROR 298
- #define POINTER 299
- #define REGISTER 300
- #define RETURN 301
- #define RSHIFT 302
- #define RSHIFTEQ 303
- #define SCON 304
- #define SHORT 305
- #define SIGNED 306
- #define SIZEOF 307
- #define STATIC 308
- #define STRUCT 309
- #define SUBEQ 310
- #define SWITCH 311
- #define TYPEDEF 312
- #define UNION 313
- #define UNSIGNED 314
- #define VOID 315
- #define VOLATILE 316
- #define WHILE 317
- #define XOREQ 318
- #define EOI 319
-
- typedef unsigned int uint;
- typedef unsigned char uchar;
-
- #define BSIZE 8192
-
- #define YYCTYPE uchar
- #define YYCURSOR cursor
- #define YYLIMIT s->lim
- #define YYMARKER s->ptr
- #define YYFILL(n) {cursor = fill(s, cursor);}
-
- #define RET(i) {s->cur = cursor; return i;}
-
- typedef struct Scanner {
- int fd;
- uchar *bot, *tok, *ptr, *cur, *pos, *lim, *top, *eof;
- uint line;
- } Scanner;
-
- uchar *fill(Scanner *s, uchar *cursor){
- if(!s->eof){
- uint cnt = s->tok - s->bot;
- if(cnt){
- memcpy(s->bot, s->tok, s->lim - s->tok);
- s->tok = s->bot;
- s->ptr -= cnt;
- cursor -= cnt;
- s->pos -= cnt;
- s->lim -= cnt;
- }
- if((s->top - s->lim) < BSIZE){
- uchar *buf = (uchar*) malloc(((s->lim - s->bot) + BSIZE)*sizeof(uchar));
- memcpy(buf, s->tok, s->lim - s->tok);
- s->tok = buf;
- s->ptr = &buf[s->ptr - s->bot];
- cursor = &buf[cursor - s->bot];
- s->pos = &buf[s->pos - s->bot];
- s->lim = &buf[s->lim - s->bot];
- s->top = &s->lim[BSIZE];
- free(s->bot);
- s->bot = buf;
- }
- if((cnt = read(s->fd, (char*) s->lim, BSIZE)) != BSIZE){
- s->eof = &s->lim[cnt]; *(s->eof)++ = '\n';
- }
- s->lim += cnt;
- }
- return cursor;
- }
-
- int scan(Scanner *s){
- uchar *cursor = s->cur;
- std:
- s->tok = cursor;
- /*!re2c
- any = [\000-\377];
- O = [0-7];
- D = [0-9];
- L = [a-zA-Z_];
- H = [a-fA-F0-9];
- E = [Ee] [+-]? D+;
- FS = [fFlL];
- IS = [uUlL]*;
- ESC = [\\] ([abfnrtv?'"\\] | "x" H+ | O+);
- */
-
- /*!re2c
- "/*" { goto comment; }
-
- "auto" { RET(AUTO); }
- "break" { RET(BREAK); }
- "case" { RET(CASE); }
- "char" { RET(CHAR); }
- "const" { RET(CONST); }
- "continue" { RET(CONTINUE); }
- "default" { RET(DEFAULT); }
- "do" { RET(DO); }
- "double" { RET(DOUBLE); }
- "else" { RET(ELSE); }
- "enum" { RET(ENUM); }
- "extern" { RET(EXTERN); }
- "float" { RET(FLOAT); }
- "for" { RET(FOR); }
- "goto" { RET(GOTO); }
- "if" { RET(IF); }
- "int" { RET(INT); }
- "long" { RET(LONG); }
- "register" { RET(REGISTER); }
- "return" { RET(RETURN); }
- "short" { RET(SHORT); }
- "signed" { RET(SIGNED); }
- "sizeof" { RET(SIZEOF); }
- "static" { RET(STATIC); }
- "struct" { RET(STRUCT); }
- "switch" { RET(SWITCH); }
- "typedef" { RET(TYPEDEF); }
- "union" { RET(UNION); }
- "unsigned" { RET(UNSIGNED); }
- "void" { RET(VOID); }
- "volatile" { RET(VOLATILE); }
- "while" { RET(WHILE); }
-
- L (L|D)* { RET(ID); }
-
- ("0" [xX] H+ IS?) | ("0" D+ IS?) | (D+ IS?) |
- (['] (ESC|any\[\n\\'])* ['])
- { RET(ICON); }
-
- (D+ E FS?) | (D* "." D+ E? FS?) | (D+ "." D* E? FS?)
- { RET(FCON); }
-
- (["] (ESC|any\[\n\\"])* ["])
- { RET(SCON); }
-
- "..." { RET(ELLIPSIS); }
- ">>=" { RET(RSHIFTEQ); }
- "<<=" { RET(LSHIFTEQ); }
- "+=" { RET(ADDEQ); }
- "-=" { RET(SUBEQ); }
- "*=" { RET(MULEQ); }
- "/=" { RET(DIVEQ); }
- "%=" { RET(MODEQ); }
- "&=" { RET(ANDEQ); }
- "^=" { RET(XOREQ); }
- "|=" { RET(OREQ); }
- ">>" { RET(RSHIFT); }
- "<<" { RET(LSHIFT); }
- "++" { RET(INCR); }
- "--" { RET(DECR); }
- "->" { RET(DEREF); }
- "&&" { RET(ANDAND); }
- "||" { RET(OROR); }
- "<=" { RET(LEQ); }
- ">=" { RET(GEQ); }
- "==" { RET(EQL); }
- "!=" { RET(NEQ); }
- ";" { RET(';'); }
- "{" { RET('{'); }
- "}" { RET('}'); }
- "," { RET(','); }
- ":" { RET(':'); }
- "=" { RET('='); }
- "(" { RET('('); }
- ")" { RET(')'); }
- "[" { RET('['); }
- "]" { RET(']'); }
- "." { RET('.'); }
- "&" { RET('&'); }
- "!" { RET('!'); }
- "~" { RET('~'); }
- "-" { RET('-'); }
- "+" { RET('+'); }
- "*" { RET('*'); }
- "/" { RET('/'); }
- "%" { RET('%'); }
- "<" { RET('<'); }
- ">" { RET('>'); }
- "^" { RET('^'); }
- "|" { RET('|'); }
- "?" { RET('?'); }
-
-
- [ \t\v\f]+ { goto std; }
-
- "\n"
- {
- if(cursor == s->eof) RET(EOI);
- s->pos = cursor; s->line++;
- goto std;
- }
-
- any
- {
- printf("unexpected character: %c\n", *s->tok);
- goto std;
- }
- */
-
- comment:
- /*!re2c
- "*/" { goto std; }
- "\n"
- {
- if(cursor == s->eof) RET(EOI);
- s->tok = s->pos = cursor; s->line++;
- goto comment;
- }
- any { goto comment; }
- */
- }
-
- main(){
- Scanner in;
- int t;
- memset((char*) &in, 0, sizeof(in));
- in.fd = 0;
- while((t = scan(&in)) != EOI){
- /*
- printf("%d\t%.*s\n", t, in.cur - in.tok, in.tok);
- printf("%d\n", t);
- */
- }
- close(in.fd);
- }
-