Method String

ast/ast.go:562–648

String returns a string representation of the constant.

()

// String returns a string representation of the constant.
func (c Constant) String() string {
	switch c.Type {
	case NameType:
		return string(c.Symbol)
	case StringType:
		s, err := Escape(c.Symbol, false /* isBytes */)
		if err != nil {
			return "<bad>"
		}
		return fmt.Sprintf(`"%s"`, s)
	case BytesType:
		s, err := Escape(c.Symbol, true /* isBytes */)
		if err != nil {
			return "<bad>"
		}
		return fmt.Sprintf(`b"%s"`, s)
	case NumberType:
		return FormatNumber(c.NumValue)
	case Float64Type:
		return FormatFloat64(math.Float64frombits(uint64(c.NumValue)))
	case TimeType:
		return fmt.Sprintf("fn:time:parse_rfc3339(\"%s\")", FormatTime(c.NumValue))
	case DurationType:
		return fmt.Sprintf("fn:duration:parse(\"%s\")", FormatDuration(c.NumValue))
	case PairShape:
		fst := *c.fst
		snd := *c.snd
		return fmt.Sprintf("fn:pair(%s, %s)", fst.String(), snd.String())
	case ListShape:
		if c.IsListNil() {
			return "[]"
		}
		var s strings.Builder
		s.WriteRune('[')
		s.WriteString((*c.fst).String())
		c = *c.snd
		for !c.IsListNil() {
			s.WriteString(", ")
			s.WriteString((*c.fst).String())
			c = *c.snd
		}
		s.WriteRune(']')
		return s.String()
	case MapShape:
		if c.IsMapNil() {
			return "fn:map()"
		}
		var s strings.Builder
		s.WriteRune('[')
		s.WriteString((*c.fst.fst).String())
		s.WriteString(" : ")
		s.WriteString((*c.fst.snd).String())
		c = *c.snd
		for !c.IsMapNil() {
			s.WriteString(", ")
			s.WriteString((*c.fst.fst).String())
			s.WriteString(" : ")
			s.WriteString((*c.fst.snd).String())