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%{
/*
* Copyright (C) 2013 Jo-Philipp Wich <jow@openwrt.org>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <ctype.h>
#include "parser.h"
int yylex(struct jp_state *s);
#define YY_DECL int yylex(struct jp_state *s)
static void
str_put(struct jp_state *s, char c)
{
if ((s->str_ptr - s->str_buf + 1) < sizeof(s->str_buf))
*s->str_ptr++ = c;
}
static void
str_decode(struct jp_state *s, const char *input, int base)
{
int code;
char *end;
code = strtoul(input, &end, base);
if (end == input || *end)
return;
if (code > 0 && code <= 0x7F)
{
str_put(s, code);
}
else if (code > 0 && code <= 0x7FF)
{
str_put(s, ((code >> 6) & 0x1F) | 0xC0);
str_put(s, ( code & 0x3F) | 0x80);
}
else if (code > 0 && code <= 0xFFFF)
{
str_put(s, ((code >> 12) & 0x0F) | 0xE0);
str_put(s, ((code >> 6) & 0x3F) | 0x80);
str_put(s, ( code & 0x3F) | 0x80);
}
else if (code > 0 && code <= 0x10FFFF)
{
str_put(s, ((code >> 18) & 0x07) | 0xF0);
str_put(s, ((code >> 12) & 0x3F) | 0x80);
str_put(s, ((code >> 6) & 0x3F) | 0x80);
str_put(s, ( code & 0x3F) | 0x80);
}
}
%}
%option outfile="lexer.c" header-file="lexer.h"
%option noyywrap nounput noinput
DOT "."
LABEL [a-zA-Z_][a-zA-Z0-9_]*
BROPEN "["
BRCLOSE "]"
POPEN "("
PCLOSE ")"
ROOT "$"
THIS "@"
LT "<"
LE "<="
GT ">"
GE ">="
NE "!="
EQ "="
NOT "!"
AND "&&"
OR "||"
NUMBER -?[0-9]+
WILDCARD "*"
BOOL (true|false)
WS [ \t\n]*
%x STRING
%%
["'] {
s->str_ptr = s->str_buf;
s->str_quote = *yytext;
memset(s->str_buf, 0, sizeof(s->str_buf));
BEGIN(STRING);
}
<STRING>{
["'] {
if (*yytext == s->str_quote)
{
BEGIN(INITIAL);
yylval.op = jp_alloc_op(T_STRING, 0, s->str_buf);
return T_STRING;
}
str_put(s, *yytext);
}
\\([0-3][0-7]{1,2}|[0-7]{0,2}) { str_decode(s, yytext + 1, 8); }
\\x[A-Fa-f0-9]{2} { str_decode(s, yytext + 2, 16); }
\\u[A-Fa-f0-9]{4} { str_decode(s, yytext + 2, 16); }
\\a { str_put(s, '\a'); }
\\b { str_put(s, '\b'); }
\\e { str_put(s, '\e'); }
\\f { str_put(s, '\f'); }
\\n { str_put(s, '\n'); }
\\r { str_put(s, '\r'); }
\\t { str_put(s, '\t'); }
\\v { str_put(s, '\v'); }
\\. { str_put(s, *yytext); }
[^\\"']+ { while (*yytext) str_put(s, *yytext++); }
}
{BOOL} {
yylval.op = jp_alloc_op(T_BOOL, (*yytext == 't'), NULL);
return T_BOOL;
}
{NUMBER} {
yylval.op = jp_alloc_op(T_NUMBER, atoi(yytext), NULL);
return T_NUMBER;
}
{LABEL} {
yylval.op = jp_alloc_op(T_LABEL, 0, yytext);
return T_LABEL;
}
{WILDCARD} {
yylval.op = jp_alloc_op(T_WILDCARD, 0, NULL);
return T_WILDCARD;
}
{DOT} { return T_DOT; }
{BROPEN} { return T_BROPEN; }
{BRCLOSE} { return T_BRCLOSE; }
{POPEN} { return T_POPEN; }
{PCLOSE} { return T_PCLOSE; }
{ROOT} { return T_ROOT; }
{THIS} { return T_THIS; }
{LT} { return T_LT; }
{LE} { return T_LE; }
{GT} { return T_GT; }
{GE} { return T_GE; }
{EQ} { return T_EQ; }
{NE} { return T_NE; }
{NOT} { return T_NOT; }
{AND} { return T_AND; }
{OR} { return T_OR; }
{WS} { }
%%
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