37 lines
746 B
Text
37 lines
746 B
Text
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%{
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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extern int yylex(void);
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void yyerror(uint32_t *result, const char *s) {
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fprintf(stderr, "Error: %s\n", s);
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}
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%}
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%token NUMBER HEX_NUMBER
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%start input
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%define api.value.type { uint32_t }
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%parse-param { uint32_t *result }
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%left '+' '-'
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%left '*' '/'
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%%
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input
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: expression { *result = $1; }
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;
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expression
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: expression '+' expression { $$ = $1 + $3; }
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| expression '-' expression { $$ = $1 - $3; }
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| expression '*' expression { $$ = $1 * $3; }
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| expression '/' expression { $$ = $1 / $3; }
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| '-' number { $$ = -$2; }
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| '(' expression ')' { $$ = $2; }
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| number { $$ = $1; }
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number
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: NUMBER
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| HEX_NUMBER
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%%
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