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  1. %{
  2. #include <stdio.h>
  3. #include <stdlib.h>
  4. #include <string.h>
  5.  
  6. typedef union {
  7.     int ival;
  8.     char *string;
  9. } YYSTYPE;
  10.  
  11. YYSTYPE yylval;
  12.  
  13. %token IF ELSE LPAREN RPAREN LBRACE RBRACE SEMICOLON ASSIGN PLUS MINUS TIMES DIVIDE GT LT GE LE EQ NE AND OR
  14. %token NUMBER IDENTIFIER
  15.  
  16. %}
  17.  
  18. %%
  19.  
  20. statement:  if_statement
  21.         | assignment
  22.         | other_statement  // For other statements
  23.  
  24. if_statement: IF LPAREN condition RPAREN LBRACE statement_list RBRACE
  25.             | IF LPAREN condition RPAREN LBRACE statement_list RBRACE ELSE LBRACE statement_list RBRACE
  26.             ;
  27.  
  28. statement_list: statement
  29.             | statement_list statement
  30.             ;
  31.  
  32. condition:  expression relational_operator expression { $$ = ($1 $2 $3); }
  33.  
  34. relational_operator: GT | LT | GE | LE | EQ | NE | AND | OR;
  35.  
  36. assignment: IDENTIFIER ASSIGN expression SEMICOLON {
  37.               printf("Assigning %d to %s\n", $3, $1); // Placeholder action
  38.           }
  39.  
  40. expression: expression PLUS expression    { $$ = $1 + $3; }
  41.           | expression MINUS expression   { $$ = $1 - $3; }
  42.           | expression TIMES expression   { $$ = $1 * $3; }
  43.           | expression DIVIDE expression  { $$ = $1 / $3; }
  44.           | NUMBER                        { $$ = $1; }
  45.           | IDENTIFIER                    { $$ = 0; } // Placeholder
  46.           | LPAREN expression RPAREN       { $$ = $2; } // Parentheses for grouping
  47.           ;
  48.  
  49. other_statement:  /* Empty or other statements */
  50.                 ;
  51.  
  52. %%
  53.  
  54. int yyerror(char *s) {
  55.     fprintf(stderr, "Error: %s\n", s);
  56.     return 1;
  57. }
  58.  
  59. int main() {
  60.     printf("Enter code (Ctrl+D to finish):\n");
  61.     yyparse();
  62.     return 0;
  63. }
Success #stdin #stdout #stderr 0.04s 6876KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
stderr
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ERROR: /home/ATDYly/prog:63:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/b0iXlz
language:
Prolog (swi 7.6.4)
created:
3 days ago
visibility:
public

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