64 lines
1.2 KiB
Plaintext
64 lines
1.2 KiB
Plaintext
%{
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#include <stdio.h>
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#include <stdlib.h>
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void yyerror(const char *s);
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int yylex(void);
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extern FILE* yyin;
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%}
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%union { int num; char var; }
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%token <num> NUMBER
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%token <var> VARIABLE
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%token LPAREN RPAREN PLUS MINUS MULTIPLY
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%%
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input:
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| expr
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;
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expr:
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term
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| expr PLUS term { printf("Found operator: +\n"); }
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| expr MINUS term { printf("Found operator: -\n"); }
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;
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term:
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factor
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| term MULTIPLY factor { printf("Found operator: *\n"); }
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;
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factor:
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NUMBER { printf("Found number: %d\n", $1); }
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| VARIABLE { printf("Found variable: %c\n", $1); }
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| LPAREN expr RPAREN
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;
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%%
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void yyerror(const char *s) {
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fprintf(stderr, "033[91mError: %s\033[0m\n", s);
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}
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int main(int argc, char** argv) {
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if (argc != 2) {
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fprintf(stderr, "\033[91mUsage: %s <input_file>\033[0m\n", argv[0]);
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return 1;
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}
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FILE* input_file = fopen(argv[1], "r");
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if (!input_file) {
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perror("033[91mFailed to open input file\033[0m\n");
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return 1;
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}
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yyin = input_file;
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printf("\033[34mParsing expression from file: %s\033[0m\n", argv[1]);
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yyparse();
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fclose(input_file);
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printf("\033[92mParsing complete\033[0m\n");
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return 0;
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} |