116 lines
2.2 KiB
Plaintext
116 lines
2.2 KiB
Plaintext
/* Simple expression parser */
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%{
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#define YYDEBUG 1
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#include <stdio.h>
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#include "util.h"
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#include "util/debug.h"
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#include <stdlib.h> // strtod()
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#define IN_EXPR_Y 1
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#include "expr.h"
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#include "smt.h"
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#include <string.h>
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%}
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%define api.pure full
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%parse-param { double *final_val }
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%parse-param { struct expr_parse_ctx *ctx }
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%parse-param {void *scanner}
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%lex-param {void* scanner}
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%union {
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double num;
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char *str;
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}
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%token EXPR_PARSE EXPR_OTHER EXPR_ERROR
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%token <num> NUMBER
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%token <str> ID
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%token MIN MAX IF ELSE SMT_ON
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%left MIN MAX IF
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%left '|'
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%left '^'
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%left '&'
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%left '-' '+'
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%left '*' '/' '%'
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%left NEG NOT
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%type <num> expr if_expr
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%{
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static void expr_error(double *final_val __maybe_unused,
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struct expr_parse_ctx *ctx __maybe_unused,
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void *scanner,
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const char *s)
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{
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pr_debug("%s\n", s);
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}
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static int lookup_id(struct expr_parse_ctx *ctx, char *id, double *val)
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{
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int i;
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for (i = 0; i < ctx->num_ids; i++) {
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if (!strcasecmp(ctx->ids[i].name, id)) {
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*val = ctx->ids[i].val;
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return 0;
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}
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}
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return -1;
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}
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%}
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%%
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start:
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EXPR_PARSE all_expr
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EXPR_OTHER all_other
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all_other: all_other other
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other: ID
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{
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if (ctx->num_ids + 1 >= EXPR_MAX_OTHER) {
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pr_err("failed: way too many variables");
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YYABORT;
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}
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ctx->ids[ctx->num_ids++].name = $1;
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}
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MIN | MAX | IF | ELSE | SMT_ON | NUMBER | '|' | '^' | '&' | '-' | '+' | '*' | '/' | '%' | '(' | ')'
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all_expr: if_expr { *final_val = $1; }
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;
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if_expr:
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expr IF expr ELSE expr { $$ = $3 ? $1 : $5; }
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| expr
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;
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expr: NUMBER
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| ID { if (lookup_id(ctx, $1, &$$) < 0) {
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pr_debug("%s not found\n", $1);
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YYABORT;
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}
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}
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| expr '|' expr { $$ = (long)$1 | (long)$3; }
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| expr '&' expr { $$ = (long)$1 & (long)$3; }
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| expr '^' expr { $$ = (long)$1 ^ (long)$3; }
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| expr '+' expr { $$ = $1 + $3; }
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| expr '-' expr { $$ = $1 - $3; }
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| expr '*' expr { $$ = $1 * $3; }
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| expr '/' expr { if ($3 == 0) YYABORT; $$ = $1 / $3; }
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| expr '%' expr { if ((long)$3 == 0) YYABORT; $$ = (long)$1 % (long)$3; }
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| '-' expr %prec NEG { $$ = -$2; }
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| '(' if_expr ')' { $$ = $2; }
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| MIN '(' expr ',' expr ')' { $$ = $3 < $5 ? $3 : $5; }
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| MAX '(' expr ',' expr ')' { $$ = $3 > $5 ? $3 : $5; }
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| SMT_ON { $$ = smt_on() > 0; }
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;
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%%
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