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|
%{
/*
* Copyright 2016 Analog Devices Inc.
* Author: Paul Cercueil <paul.cercueil@analog.com>
*
* This 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, or (at your option)
* any later version.
*
* This software 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 software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "parser.h"
#include <math.h>
#include <stdio.h>
int yylex(YYSTYPE *type, yyscan_t scanner);
void yyerror(yyscan_t scanner, const char *msg);
%}
%code requires {
#ifndef YY_TYPEDEF_YY_SCANNER_T
#define YY_TYPEDEF_YY_SCANNER_T
typedef void *yyscan_t;
#endif
int yylex_init_extra(void *pdata, yyscan_t *scanner);
int yylex_destroy(yyscan_t yyscanner);
void * yyget_extra(yyscan_t scanner);
void * src_block(void *pdata, unsigned int input);
void * const_block(void *pdata, double value);
void * add_block(void *pdata, void *left, void *right);
void * sub_block(void *pdata, void *left, void *right);
void * mult_block(void *pdata, void *left, void *right);
void * div_block(void *pdata, void *left, void *right);
void * pow_block(void *pdata, void *left, void *right);
void * mod_block(void *pdata, void *left, void *right);
void * func_block(void *pdata, void *input, const char *name);
void * neg_block(void *pdata, void *input);
void connect_to_output(void *pdata, void *input);
void delete_block(void *pdata, void *block);
}
/* Bison declarations. */
%define api.pure
%lex-param { yyscan_t scanner }
%parse-param { yyscan_t scanner }
%start Line
%union {
double val;
unsigned int ival;
char *fname;
void *block;
}
%token<fname> FNAME;
%token<val> VALUE;
%token<ival> IN_PORT;
%type<block> Element;
%type<block> Factor;
%type<block> Term;
%token POWER;
%left '-' '+' '*' '/' '%'
%precedence PREFIX
%right POWER
%destructor { free($$); } <fname>
%destructor { delete_block(yyget_extra(scanner), $$); } <block>
%%
Element:
IN_PORT[t] {
$$ = src_block(yyget_extra(scanner), $t);
}
| VALUE[t] {
$$ = const_block(yyget_extra(scanner), $t);
}
| FNAME[n] '(' Term[t] ')' {
$$ = func_block(yyget_extra(scanner), $t, $n);
}
| '(' Term[t] ')' {
$$ = $t;
}
| '-' Element[t] %prec PREFIX {
$$ = neg_block(yyget_extra(scanner), $t);
}
| '+' Element[t] %prec PREFIX {
$$ = $t;
}
;
Factor:
Element
| Factor[f1] '*' Factor[f2] {
$$ = mult_block(yyget_extra(scanner), $f1, $f2);
}
| Factor[f1] '/' Factor[f2] {
$$ = div_block(yyget_extra(scanner), $f1, $f2);
}
| Factor[f1] POWER Factor[f2] {
$$ = pow_block(yyget_extra(scanner), $f1, $f2);
}
| Factor[f1] '%' Factor[f2] {
$$ = mod_block(yyget_extra(scanner), $f1, $f2);
/* TODO(pcercuei): Implement modulo */
}
;
Term:
Factor
/* TODO(pcercuei): Implement const operations
| Term '+' VALUE { }
| Term '-' VALUE { }
| VALUE '+' Term { }
| VALUE '-' Term { }
*/
| Term[t1] '+' Term[t2] {
$$ = add_block(yyget_extra(scanner), $t1, $t2);
}
| Term[t1] '-' Term[t2] {
$$ = sub_block(yyget_extra(scanner), $t1, $t2);
}
;
Line:
Term[t] {
connect_to_output(yyget_extra(scanner), $[t]);
}
%%
void yyerror(yyscan_t scanner, const char *msg)
{
printf("ERROR: %s\n", msg);
}
|
