なんか、すごい、色々書くのが面倒だったのでファイルの記載のみ。
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%{ #include <stdio.h> #include <stdlib.h> #define YYDEBUG 1 %} %union { int int_value; double double_value; } %token <double_value> DOUBLE_LITERAL %token ADD SUB MUL DIV CR %type <double_value> expression term primary_expression %% line_list : line | line_list line ; line : expression CR { printf(">>%lf\n", $1); } expression : term | expression ADD term { $$ = $1 + $3; } | expression SUB term { $$ = $1 - $3; } ; term : primary_expression | term MUL primary_expression { $$ = $1 * $3; } | term DIV primary_expression { $$ = $1 / $3; } ; primary_expression : DOUBLE_LITERAL ; %% int yyerror(char const *str) { extern char *yytext; fprintf(stderr, "parser error near %s\n", yytext); return 0; } int main(void) { extern int yyparse(void); extern FILE *yyin; yyin = stdin; if (yyparse()) { fprintf(stderr, "Error ! Error ! Error !\n"); exit(1); } } |
