option noyywrap bison-bridge bison-locations include stdio include std

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%option noyywrap bison-bridge bison-locations
%{
#include <stdio.h>
#include <stdlib.h>
#define TAG_STROK 1
#define TAG_NUMBER 2
#define TAG_IDENT 3
char *tag_names[] =
{
"END_OF_PROGRAM" , "STROK" , "NUMBER" ,
"IDENT"
};
struct Position
{
int line , pos , index ;
};
void print_pos ( struct Position *p )
{
printf("(%d,%d)" ,p->line, p->pos);
}
struct Fragment
{
struct Position starting , following;
};
typedef struct Fragment YYLTYPE ;
void print_frag ( struct Fragment *f )
{
print_pos (&(f->starting));
printf ("-");
print_pos(&(f->following));
}
union Token {
char *ident; /* Бандитизм: должно быть int code; */
};
typedef union Token YYSTYPE;
int continued;
struct Position cur;
#define YY_USER_ACTION \
{ \
int i; \
if (! continued) \
yylloc->starting = cur; \
continued = 0; \
\
for (i = 0; i < yyleng; i++) \
{ \
if (yytext[i] == '\n') \
{ \
cur.line++; \
cur.pos = 1; \
} \
else \
cur.pos++; \
cur.index++; \
} \
\
yylloc->following = cur; \
}
void init_scanner(char *program)
{
continued =0;
cur.line = 1;
cur.pos =1;
cur.index = 0;
yy_scan_string(program);
}
void err(char *msg)
{
printf("Error ");
print_pos(&cur);
printf(": %s\n",msg);
}
%}
DIGIT [0-9]
NUMBER \-?{DIGIT}+(\.{DIGIT}+)?
IDENT [a-zA-Z][a-zA-Z\.0-9]*
STROK '([^']|(''))*'
%%
[\n\t ]+
{STROK} {
/* Бандитизм: нет проверки на переполнение. */
yylval->ident = yytext;
return TAG_STROK;
}
{NUMBER} {
/* Бандитизм: нет проверки на переполнение. */
yylval->ident = yytext;
return TAG_NUMBER;
}
{IDENT} {
/* Бандитизм: нет проверки на переполнение. */
yylval->ident = yytext;
return TAG_IDENT;
}
. err("unexpected character");
%%
#define PROGRAM "-99.1234!qqq888.99...999'q''q'"
int main ()
{
int tag;
YYSTYPE value;
YYLTYPE coords;
init_scanner (PROGRAM);
do
{
tag = yylex (&value ,&coords);
if (tag != 0)
{
print_frag(&coords);
printf(" %s %s\n", tag_names[tag], value.ident);
}
}
while ( tag != 0);
return 0;
}