Exemplo n.º 1
0
func compare(st px.ParsexState) (interface{}, error) {
	l, err := px.Bind(px.Choice(
		px.Bind(IntValue, LessThanNumber),
		px.Bind(NumberValue, LessThanFloat),
		px.Bind(px.StringVal, LessThanString),
		px.Bind(TimeValue, LessThanTime),
	), func(l interface{}) px.Parser {
		return func(st px.ParsexState) (interface{}, error) {
			_, err := px.Eof(st)
			if err != nil {
				return nil, ParsexSignErrorf("less args sign error: except eof")
			}
			return l, nil
		}
	})(st)
	if err == nil {
		return l, nil
	}
	return nil, ParsexSignErrorf("Except two lessable values compare but error %v", err)
}
Exemplo n.º 2
0
// return false, true or nil
func lessOption(env Env) px.Parser {
	return func(st px.ParsexState) (interface{}, error) {
		l, err := px.Bind(px.Choice(
			px.Try(px.Bind(IntValue, LessThanNumber)),
			px.Try(px.Bind(NumberValue, LessThanFloat)),
			px.Try(px.Bind(px.StringVal, LessThanString)),
			px.Try(px.Bind(TimeValue, LessThanTime)),
			px.Try(px.Bind(ListValue, LessThanListOption(env))),
			px.Bind(px.AnyOne, LessThanNil),
		), func(l interface{}) px.Parser {
			return func(st px.ParsexState) (interface{}, error) {
				_, err := px.Eof(st)
				if err != nil {
					return nil, ParsexSignErrorf("less args sign error: except eof")
				}
				return l, nil
			}
		})(st)
		if err == nil {
			return l, nil
		}
		return nil, ParsexSignErrorf("Except two lessable values or nil compare but error: %v", err)
	}
}
Exemplo n.º 3
0
		},
		"choice": func(env Env, args ...interface{}) (Lisp, error) {
			ptype := reflect.TypeOf((px.Parser)(nil))
			params, err := GetArgs(env, px.ManyTil(TypeAs(ptype), px.Eof), args)
			if err != nil {
				return nil, err
			}
			parsers := make([]px.Parser, len(params))
			for idx, prs := range params {
				if parser, ok := prs.(Parsexer); ok {
					parsers[idx] = parser.Parser
				}
				return nil, ParsexSignErrorf("Choice Args Error:except parsec parsers but %v is %v",
					prs, reflect.TypeOf(prs))
			}
			return ParsexBox(px.Choice(parsers...)), nil
		},
		"return": func(env Env, args ...interface{}) (Lisp, error) {
			if len(args) != 1 {
				return nil, ParsexSignErrorf("Parsex Parser Return Error: only accept one parsex parser as arg but %v", args)
			}
			param, err := Eval(env, args[0])
			if err != nil {
				return nil, err
			}
			return ParsexBox(px.Return(param)), nil
		},
		"option": func(env Env, args ...interface{}) (Lisp, error) {
			if len(args) != 2 {
				return nil, ParsexSignErrorf("Parsex Parser Option Error: only accept two parsex parser as arg but %v", args)
			}
Exemplo n.º 4
0
func ExtReverseExpr(expr func(Env) px.Parser) LispExpr {
	return func(env Env, args ...interface{}) (Lisp, error) {
		return ParsexReverseExpr(expr(env))(env, args...)
	}
}

var addExpr = ParsexExpr(addx)
var subExpr = ParsexExpr(subx)
var mulExpr = ParsexExpr(mulx)
var divExpr = ParsexExpr(divx)
var lessExpr = ExtExpr(less)
var lsoExpr = ExtExpr(lessOption)
var leExpr = OrExtRExpr(equals, less)
var leoExpr = OrExtRExpr(equalsOption, lessOption)
var cmpExpr = ParsexExpr(compare)
var greatExpr = ExtReverseExpr(less)
var gtoExpr = ExtReverseExpr(lessOption)
var geExpr = OrExtRExpr(equals, less)
var geoExpr = func(env Env, args ...interface{}) (Lisp, error) {
	st := px.NewStateInMemory(args)
	ret, err := px.Choice(px.Try(NotParsex(less(env))), FalseIfHasNil)(st)
	if err != nil {
		return nil, err
	}
	return Q(ret), nil
}
var eqsExpr = ParsexExpr(equals)
var eqsoExpr = ParsexExpr(equalsOption)
var neqsExpr = NotExpr(eqsExpr)
var neqsoExpr = ParsexExpr(neqsOption)