-
Notifications
You must be signed in to change notification settings - Fork 0
/
parser.y
83 lines (65 loc) · 2.07 KB
/
parser.y
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
%{
/*
* This file is part of props
* Copyright (c) 2017 props's authors
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "expression.h"
#include "parser.h"
#include "lexer.h"
int yyerror(Expression **exp, yyscan_t scanner, const char *msg) {
fprintf(stderr,"Lexer error:%s\n",msg);
return 0;
}
%}
%code requires {
#ifndef YY_TYPEDEF_YY_SCANNER_T
#define YY_TYPEDEF_YY_SCANNER_T
typedef void* yyscan_t;
#endif
}
%output "parser.c"
%defines "parser.h"
%define api.pure full
%lex-param {yyscan_t scanner}
%parse-param {Expression **expression}
%parse-param {yyscan_t scanner}
%union {
char value;
Expression *expression;
}
%left "<->" TOKEN_DOUBLE_IMPLIES
%right "->" TOKEN_IMPLIES
%left "\\/" TOKEN_OR
%left "/\\" TOKEN_AND
%left '-' TOKEN_NOT
%token TOKEN_LPAREN
%token TOKEN_RPAREN
%token TOKEN_NOT
%token TOKEN_AND
%token TOKEN_OR
%token TOKEN_IMPLIES
%token TOKEN_DOUBLE_IMPLIES
%token <value> TOKEN_PROP
%type <expression> expr
%%
input: expr {*expression = $1;}
;
expr: TOKEN_NOT expr[L] {$$ = createOp(NOT,NULL,$L);}
| expr[L] TOKEN_OR expr[R] { $$ = createOp(OR, $L,$R);}
| expr[L] TOKEN_AND expr[R] { $$ = createOp(AND, $L, $R);}
| expr[L] TOKEN_IMPLIES expr[R] { $$ = createOp(IMPLIES, $L, $R);}
| expr[L] TOKEN_DOUBLE_IMPLIES expr[R] { $$ = createOp(DOUBLE_IMPLIES, $L, $R);}
| TOKEN_LPAREN expr[E] TOKEN_RPAREN { $$ = $E;}
| TOKEN_PROP { $$ = createProp($1);}
;
%%