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%{
#include <err.h>
#include <stdbool.h>
#include <stdlib.h>
#include "parser.h"
#include "pinocchio.h"
#define YY_USER_INIT \
do { \
if (!interactive) \
BEGIN(linecont); \
} while (false);
#define YY_USER_ACTION \
do { \
yylloc.first_line = yylloc.last_line; \
yylloc.first_column = yylloc.last_column; \
yylloc.last_column += yyleng; \
} while (false);
#define LOCNL \
do { \
yylloc.last_line++; \
yylloc.last_column = 1; \
} while (false) \
/* Silence warnings in the generated lexer */
#pragma GCC diagnostic ignored "-Wsign-compare"
extern bool interactive, utf8;
extern const char *current_file;
%}
%option nodefault
%option noinput nounput noyywrap
ws [ \t]
%x error
%s linecont
%%
¬|! { return NOT; }
∧|&& { return AND; }
∨|\|\| { return OR; }
⊻|⊕|~ { return XOR; }
⇒|=> { return IMPL; }
\<=>|⇔ { return EQUIV; }
\( { return OPAR; }
\) { return CPAR; }
\| { return '|'; }
\\ { return '\\'; }
\n {
LOCNL;
return EOL;
}
/* Allow line-continuation when the newline is suffixed by a
backslash, but not in interactive mode! Interactive usage should
have this functionality disabled so that you get instant feedback
after hitting the enter key. */
<linecont>\n{ws}*\\ {
LOCNL;
yylloc.last_column = yyleng;
}
[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. */
. {
char ch = *yytext;
static const char *quotes[][2] = {
{"`", "'"},
{"‘", "’"},
};
const char *lquot = quotes[utf8][0],
*rquot = quotes[utf8][1];
if (ch == '&') {
user_error("%s:%d:%d: Unrecognized character %s&%s, did you mean %s&&%s?",
current_file, yylloc.first_line, yylloc.first_column,
lquot, rquot, lquot, rquot);
} else if (ch == '^') {
user_error("%s:%d:%d: Unrecognized character %s^%s, did you mean %s~%s?",
current_file, yylloc.first_line, yylloc.first_column,
lquot, rquot, lquot, rquot);
} else {
user_error("%s:%d:%d: Unrecognized character %s%c%s",
current_file, yylloc.first_line, yylloc.first_column,
lquot, ch, rquot);
}
BEGIN(error);
return YYerror;
}
<error>.* { BEGIN(0); }
<error>.*\n { LOCNL; BEGIN(0); }
%%
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