Subversion Repositories programming

/*******************************************************************************

 * File: jminus.y

 * 

 * Copyright (c) 2006, Ira W. Snyder (devel@irasnyder.com)

 * License: GNU General Public License v2

 * 

 ******************************************************************************/

%{

    import java.lang.*;

    import java.io.*;

    import.java.util.StringTokenizer;

%}

/* Token Declarations */

%token CLASS

%token ID

%token PUBLIC

%token PRIVATE

%token INT

%token FLOAT

%token VOID

%token IF

%token ELSE

%token WHILE

%token RETURN

%token ADDOP

%token MULOP

%token NUM

%token LPAREN

%token RPAREN

%token LBRACE

%token RBRACE

%token SEMI

%token ASSIGNOP

/* JMinus Grammar */

%%

program : modifier CLASS ID LBRACE method_declaration RBRACE

    { System.out.println ("program reduce"); };

modifier : PUBLIC { System.out.println ("modifier reduce"); }

    | PRIVATE { System.out.println ("modifier reduce"); };

method_declaration : modifier type_specifier ID LPAREN param RPAREN LBRACE local_declaration stmt_sequence RBRACE

    { System.out.println ("method_declaration reduce"); };

type_specifier : INT { System.out.println ("type_specifier -> INT reduce"); }

    | FLOAT { System.out.println ("type_specifier -> INT reduce"); }

    | VOID { System.out.println ("type_specifier -> INT reduce"); };

param : type_specifier ID { System.out.println ("param reduce"); }

    | VOID { System.out.println ("param -> VOID reduce"); };

local_declaration : type_specifier ID SEMI { System.out.println ("local_declaration reduce"); }

    | { System.out.println ("local_declaration -> epsilon reduce"); };

stmt_sequence : stmt_sequence statement { System.out.println ("stmt_sequence reduce"); }

    | statement { System.out.println ("stmt_sequence -> statement reduce"); };

statement : if_stmt { System.out.println ("statement -> if_stmt reduce"); }

    | while_stmt { System.out.println ("statement -> while_stmt reduce"); }

    | assign_stmt { System.out.println ("statement -> assign_stmt reduce"); }

    | return_stmt { System.out.println ("statement -> return_stmt reduce"); }

    | expr_stmt { System.out.println ("statement -> expr_stmt reduce"); };

if_stmt : IF LPAREN exp RPAREN statement ELSE statement { System.out.println ("if_stmt reduce"); };

while_stmt : WHILE LPAREN exp RPAREN statement { System.out.println ("while_stmt reduce"); };

assign_stmt : ID ASSIGNOP exp SEMI { System.out.println ("assign_stmt reduce"); };

return_stmt : RETURN exp SEMI { System.out.println ("return_stmt -> RETURN exp ; reduce"); }

    | RETURN SEMI { System.out.println ("return_stmt -> RETURN ; reduce"); };

expr_stmt : exp SEMI { System.out.println ("expr_stmt -> exp ; reduce"); };

exp : exp ADDOP term { System.out.println ("exp -> exp + term reduce"); }

    | term { System.out.println ("exp -> term reduce"); };

term : term MULOP factor { System.out.println ("term -> term * factor reduce"); }

    | factor { System.out.println ("term -> factor reduce"); };

factor : LPAREN exp RPAREN { System.out.println ("factor -> ( exp ) reduce"); }

    | ADDOP factor { System.out.println ("factor -> + factor reduce"); }

    | NUM { System.out.println ("factor -> NUM reduce"); }

    | ID { System.out.println ("factor -> ID reduce"); };

%%