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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 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 | /* Simple expression parser */ %{ #define YYDEBUG 1 #include <stdio.h> #include "util.h" #include "util/debug.h" #include <stdlib.h> // strtod() #define IN_EXPR_Y 1 #include "expr.h" #include "smt.h" #include <string.h> static double d_ratio(double val0, double val1) { if (val1 == 0) { return 0; } return val0 / val1; } %} %define api.pure full %parse-param { double *final_val } %parse-param { struct expr_parse_ctx *ctx } %parse-param {void *scanner} %lex-param {void* scanner} %union { double num; char *str; } %token EXPR_PARSE EXPR_OTHER EXPR_ERROR %token <num> NUMBER %token <str> ID %destructor { free ($$); } <str> %token MIN MAX IF ELSE SMT_ON D_RATIO %left MIN MAX IF %left '|' %left '^' %left '&' %left '<' '>' %left '-' '+' %left '*' '/' '%' %left NEG NOT %type <num> expr if_expr %{ static void expr_error(double *final_val __maybe_unused, struct expr_parse_ctx *ctx __maybe_unused, void *scanner, const char *s) { pr_debug("%s\n", s); } %} %% start: EXPR_PARSE all_expr | EXPR_OTHER all_other all_other: all_other other | other: ID { expr__add_id(ctx, $1); } | MIN | MAX | IF | ELSE | SMT_ON | NUMBER | '|' | '^' | '&' | '-' | '+' | '*' | '/' | '%' | '(' | ')' | ',' | '<' | '>' | D_RATIO all_expr: if_expr { *final_val = $1; } ; if_expr: expr IF expr ELSE expr { $$ = $3 ? $1 : $5; } | expr ; expr: NUMBER | ID { struct expr_id_data *data; if (expr__resolve_id(ctx, $1, &data)) { free($1); YYABORT; } $$ = data->val; free($1); } | expr '|' expr { $$ = (long)$1 | (long)$3; } | expr '&' expr { $$ = (long)$1 & (long)$3; } | expr '^' expr { $$ = (long)$1 ^ (long)$3; } | expr '<' expr { $$ = $1 < $3; } | expr '>' expr { $$ = $1 > $3; } | expr '+' expr { $$ = $1 + $3; } | expr '-' expr { $$ = $1 - $3; } | expr '*' expr { $$ = $1 * $3; } | expr '/' expr { if ($3 == 0) { pr_debug("division by zero\n"); YYABORT; } $$ = $1 / $3; } | expr '%' expr { if ((long)$3 == 0) { pr_debug("division by zero\n"); YYABORT; } $$ = (long)$1 % (long)$3; } | '-' expr %prec NEG { $$ = -$2; } | '(' if_expr ')' { $$ = $2; } | MIN '(' expr ',' expr ')' { $$ = $3 < $5 ? $3 : $5; } | MAX '(' expr ',' expr ')' { $$ = $3 > $5 ? $3 : $5; } | SMT_ON { $$ = smt_on() > 0; } | D_RATIO '(' expr ',' expr ')' { $$ = d_ratio($3,$5); } ; %% |