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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
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 {cursor = fill(s, cursor);}
#define RETURN(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;
uint depth;
std:
s->tok = cursor;
/*!re2c
any = [\000-\377];
digit = [0-9];
letter = [a-zA-Z];
*/
/*!re2c
"(*" { depth = 1; goto comment; }
digit + {RETURN(1);}
digit + / ".." {RETURN(1);}
[0-7] + "B" {RETURN(2);}
[0-7] + "C" {RETURN(3);}
digit [0-9A-F] * "H" {RETURN(4);}
digit + "." digit * ("E" ([+-]) ? digit +) ? {RETURN(5);}
['] (any\[\n']) * ['] | ["] (any\[\n"]) * ["] {RETURN(6);}
"#" {RETURN(7);}
"&" {RETURN(8);}
"(" {RETURN(9);}
")" {RETURN(10);}
"*" {RETURN(11);}
"+" {RETURN(12);}
"," {RETURN(13);}
"-" {RETURN(14);}
"." {RETURN(15);}
".." {RETURN(16);}
"/" {RETURN(17);}
":" {RETURN(18);}
":=" {RETURN(19);}
";" {RETURN(20);}
"<" {RETURN(21);}
"<=" {RETURN(22);}
"<>" {RETURN(23);}
"=" {RETURN(24);}
">" {RETURN(25);}
">=" {RETURN(26);}
"[" {RETURN(27);}
"]" {RETURN(28);}
"^" {RETURN(29);}
"{" {RETURN(30);}
"|" {RETURN(31);}
"}" {RETURN(32);}
"~" {RETURN(33);}
"AND" {RETURN(34);}
"ARRAY" {RETURN(35);}
"BEGIN" {RETURN(36);}
"BY" {RETURN(37);}
"CASE" {RETURN(38);}
"CONST" {RETURN(39);}
"DEFINITION" {RETURN(40);}
"DIV" {RETURN(41);}
"DO" {RETURN(42);}
"ELSE" {RETURN(43);}
"ELSIF" {RETURN(44);}
"END" {RETURN(45);}
"EXIT" {RETURN(46);}
"EXPORT" {RETURN(47);}
"FOR" {RETURN(48);}
"FROM" {RETURN(49);}
"IF" {RETURN(50);}
"IMPLEMENTATION" {RETURN(51);}
"IMPORT" {RETURN(52);}
"IN" {RETURN(53);}
"LOOP" {RETURN(54);}
"MOD" {RETURN(55);}
"MODULE" {RETURN(56);}
"NOT" {RETURN(57);}
"OF" {RETURN(58);}
"OR" {RETURN(59);}
"POINTER" {RETURN(60);}
"PROCEDURE" {RETURN(61);}
"QUALIFIED" {RETURN(62);}
"RECORD" {RETURN(63);}
"REPEAT" {RETURN(64);}
"RETURN" {RETURN(65);}
"SET" {RETURN(66);}
"THEN" {RETURN(67);}
"TO" {RETURN(68);}
"TYPE" {RETURN(69);}
"UNTIL" {RETURN(70);}
"VAR" {RETURN(71);}
"WHILE" {RETURN(72);}
"WITH" {RETURN(73);}
letter (letter | digit) * {RETURN(74);}
[ \t]+ { goto std; }
"\n"
{
if(cursor == s->eof) RETURN(0);
s->pos = cursor; s->line++;
goto std;
}
any
{
printf("unexpected character: %c\n", *s->tok);
goto std;
}
*/
comment:
/*!re2c
"*)"
{
if(--depth == 0)
goto std;
else
goto comment;
}
"(*" { ++depth; goto comment; }
"\n"
{
if(cursor == s->eof) RETURN(0);
s->tok = s->pos = cursor; s->line++;
goto comment;
}
any { goto comment; }
*/
}
/*
void putStr(FILE *o, char *s, uint l){
while(l-- > 0)
putc(*s++, o);
}
*/
main(){
Scanner in;
memset((char*) &in, 0, sizeof(in));
in.fd = 0;
while(scan(&in)){
/*
putc('<', stdout);
putStr(stdout, (char*) in.tok, in.cur - in.tok);
putc('>', stdout);
putc('\n', stdout);
*/
}
}
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