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|
%{
#include <stdio.h>
#include "ast.c"
extern FILE *yyin;
extern int yylex();
extern void yyerror();
ast_node* yyast = NULL;
%}
%define parse.error verbose
%union {
char* string;
int number;
ast_node* node;
}
%token OPERATOR_PLUS
%token OPERATOR_MINUS
%token ASSIGN
%token FUNCTION
%token IF
%token ELSE
%token RETURN
%token CONST
%token VAR
%token <string> TYPE_INTEGER
%token <string> TYPE_STRING
%token <string> TYPE_VOID
%token PARENTHESIS_LEFT
%token PARENTHESIS_RIGHT
%token BRACE_LEFT
%token BRACE_RIGHT
%token BRACKET_LEFT
%token BRACKET_RIGHT
%token COMMA;
%token COLON;
%token <number> NUMBER;
%token <string> IDENTIFIER
%token COMMENT;
%token END_OF_LINE;
%type <node> program
%type <node> function
%type <node> arguments
%type <node> argument
%type <node> return_type
%type <node> variable_type
%type <node> statements
%type <node> statement
%type <node> expression
%start program
%%
program: { $$ = NULL; }
| program statement END_OF_LINE { $$ = create_program_node($1, $2); }
// function henshin(): void {}
// function henshin(hen: integer, shin: integer): void {}
function:
FUNCTION IDENTIFIER PARENTHESIS_LEFT PARENTHESIS_RIGHT COLON return_type BRACE_LEFT statements BRACE_RIGHT
| FUNCTION IDENTIFIER PARENTHESIS_LEFT arguments PARENTHESIS_RIGHT COLON return_type BRACE_LEFT statements BRACE_RIGHT
arguments:
argument
| arguments COMMA argument
argument:
IDENTIFIER COLON variable_type { $$ = create_argument_node($1, $3); }
return_type:
TYPE_INTEGER { $$ = create_type_node($1); }
| TYPE_STRING { $$ = create_type_node($1); }
| TYPE_VOID { $$ = create_type_node($1); }
variable_type:
TYPE_INTEGER { $$ = create_type_node($1); }
| TYPE_STRING { $$ = create_type_node($1); }
statements:
statement
| statements END_OF_LINE statement
statement:
// const henshin: integer = 2
| CONST IDENTIFIER COLON variable_type ASSIGN expression
| RETURN expression
| IDENTIFIER PARENTHESIS_LEFT PARENTHESIS_RIGHT
| function
expression:
NUMBER
| IDENTIFIER
%%
void main (int argc, char **argv)
{
//henshin_lex();
yyin = fopen(argv[1], "r");
yyparse();
printf("%s", yyast);
}
|
