cat language programming code example

Example: cat programming language

export var catGrammar = new function() 
    {
        var _this = this;
        this.identifier     = m.identifier.ast;
        this.integer        = m.integer.ast;
        this.true           = m.keyword("true").ast;
        this.false          = m.keyword("false").ast;
        this.typeExprRec    = m.delay(() => { return _this.typeExpr});
        this.typeArray      = m.guardedSeq('[', m.ws, this.typeExprRec.ws.zeroOrMore, ']').ast;
        this.funcInput      = this.typeExprRec.ws.zeroOrMore.ast;
        this.funcOutput     = this.typeExprRec.ws.zeroOrMore.ast;
        this.typeFunc       = m.guardedSeq('(', m.ws, this.funcInput, '->', m.ws, this.funcOutput, ')').ast;
        this.typeVar        = m.guardedSeq("'", m.identifier).ast;
        this.typeConstant   = m.identifier.ast;
        this.typeExpr       = m.choice(this.typeArray, this.typeFunc, this.typeVar, this.typeConstant).ast;        
        this.recTerm        = m.delay(() => { return _this.term; });
        this.quotation      = m.guardedSeq('[', m.ws, this.recTerm.ws.zeroOrMore, ']').ast;
        this.term           = m.choice(this.quotation, this.integer, this.true, this.false, this.identifier); 
        this.terms          = m.ws.then(this.term.ws.zeroOrMore);
        this.definedName    = m.identifier.ast;
        this.typeSig        = m.guardedSeq(":", m.ws, this.typeExpr).ast;
        this.extern         = m.guardedSeq(m.keyword('extern').ws, this.definedName, m.ws, this.typeSig).ast;
        this.definition     = m.guardedSeq('{', this.term.zeroOrMore, '}').ast;
        this.define         = m.guardedSeq(m.keyword('define').ws, this.definedName, m.ws, this.typeSig.opt, this.definition).ast;
        this.program        = m.choice(this.define, this.extern, this.term).zeroOrMore.ast;
    }