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%{
#include <err.h>
#include <stdlib.h>
#include "parser.h"
#include "pinocchio.h"
#define YY_USER_ACTION yylloc.first_line = yylloc.last_line = yylineno;
extern const char *current_file;
%}
%option yylineno
%option nodefault
%option noinput nounput noyywrap
ws [ \t]
%x error
%%
¬|! { return NOT; }
∧|&& { return AND; }
∨|\|\| { return OR; }
⊻|⊕|~ { return XOR; }
⇒|=> { return IMPL; }
\<=>|⇔ { return EQUIV; }
\( { return OPAR; }
\) { return CPAR; }
\| { return '|'; }
\\ { return '\\'; }
\n { return EOL; }
/* Allow line-continuation when the newline is suffixed by a backslash */
\n{ws}*\\ ;
[a-zA-Z] {
yylval.ch = *yytext;
return IDENT;
}
{ws}+ ;
/* Throw an error on an invalid token. When in interactive mode we
should slurp up all data on the current line after reporting the
error so that lexing/parsing doesn’t continue right after the
offending token but instead on the next line typed by the user. */
. {
user_error("%s:%d: Unrecognized character ‘%c’",
current_file, yylineno, *yytext);
BEGIN(error);
return YYerror;
}
<error>.*|\n { BEGIN(0); }
%%
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