GoLexThatJava/syn.y at main · Mellywins/GoLexThatJava · GitHub

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%{
    package main
    import (
	"github.com/timtadh/lexmachine"
    )

%}
%union{
    token *lexmachine.Token
    ast   *Node
}


%token BANG
%token INTEGER_LITERAL
%token BOOLEAN_LITERAL
%token IDENTIFIER
%token CLASS
%token PUBLIC
%token STATIC
%token VOID
%token MAIN
%token STRING
%token SYSTEMOUTPRINTLN
%token RETURN
%token INT
%token IF
%token FOR
%token ELSE
%token WHILE
%token THIS
%token NEW
%token BOOLEAN
%token LENGTH
%token EXTENDS
%token LEFTBRACKET
%token RIGHTBRACKET
%token LEFTANGLEBRACKET
%token RIGHTANGLEBRACKET
%token COMMA
%token SEMICOLON
%token COLON
%token LEFTPARENTHESIS
%token RIGHTPARENTHESIS
%token PERIOD
%token PLUS
%token ASTERIX
%token DIVISION
%token MODULO
%token DOUBLEQUAL
%token DIFFERENT
%token LESS
%token LESSOREQUALS
%token GREATER
%token GREATEROREQUALS
%token LOGICALAND
%token LOGICALOR
%token EQUAL
%token MINUS
%%

Program : Statement {yylex.(*golex).stmts=append(yylex.(*golex).stmts,$1.ast)}
;

Statement: Expression Operator Expression
    {

        $$.ast = NewNode("Statement", nil).AddKid($2.ast).AddKid($1.ast).AddKid($3.ast)

        __yyfmt__.Printf("%s + %s",$1.token.Lexeme,$3.token.Lexeme)

        }
;
Expression: INTEGER_LITERAL {$$.ast = NewNode("INTEGER_LITERAL",$1.token)}
        ;
Operator: PLUS {$$.ast = NewNode("PLUS", $1.token)}
        | MINUS {$$.ast = NewNode("MINUS", $1.token)}
        ;
%%