gouda/Value.go at master · zetaben/gouda · GitHub

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package gouda

import (
	"fmt"
)

const (
	EOOKind = iota
	NumberKind
	StringKind
	BooleanKind
	NullKind
	IntKind
	LongKind
)


type SysString string
type SysInt int
type Value interface {
	Kind() int
	Number() float64
	String() SysString
	Bool() bool
	Int() SysInt
}

type WriteValue interface {
	SetNumber(float64)
	SetString(SysString)
	SetBool(bool)
	SetInt(SysInt)
}

type _Null struct{}

func (*_Null) Kind() int           { return NullKind }
func (*_Null) Number() float64     { return 0 }
func (*_Null) String() SysString   { return "null" }
func (*_Null) Bool() bool          { return false }
func (*_Null) Int() SysInt         { return 0 }
func (*_Null) SetNumber(float64)   {}
func (*_Null) SetString(SysString) {}
func (*_Null) SetBool(bool)        {}
func (*_Null) SetInt(SysInt)       {}


type _Int struct {
	value SysInt
	_Null
}

func (e *_Int) Kind() int       { return IntKind }
func (e *_Int) Int() SysInt     { return e.value }
func (e *_Int) SetInt(i SysInt) { e.value = i }

func (i SysInt) Value() (ii *_Int) {
	ii = new(_Int)
	ii.SetInt(i)
	return
}


type _String struct {
	value SysString
	_Null
}

func (e *_String) Kind() int             { return StringKind }
func (e *_String) SetString(s SysString) { e.value = s }
func (e *_String) String() SysString     { return e.value }

func (i SysString) Value() (ii *_String) {
	ii = new(_String)
	ii.SetString(i)
	return
}


func (v *_Int) GoString() string { return "gouda.SysInt(" + fmt.Sprint(v.Int()) + ").Value()" }
func (v *_String) GoString() string {
	return fmt.Sprintf("gouda.SysString(%#v).Value()", v.String())
}

func (v *_Null) GoString() string { return "*Hem*" }

func Equal(v1, v2 Value) bool {
	if v1.Kind() != v2.Kind() {
		return false
	}
	switch v1.Kind() {
	case IntKind:
		return int(v1.Int()) == int(v2.Int())
	case StringKind:
		return string(v1.String()) == string(v2.String())
	}
	return false
}

func Less(v1, v2 Value) bool {
	if v1.Kind() != v2.Kind() {
		return false
	}
	switch v1.Kind() {
	case IntKind:
		return int(v1.Int()) < int(v2.Int())
	case StringKind:
		return string(v1.String()) < string(v2.String())
	}
	return false
}

func More(v1, v2 Value) bool {
	return !Less(v1,v2) && !Equal(v1,v2)
}

func MoreOrEqual(v1, v2 Value) bool {
	return !Less(v1,v2)
}

func LessOrEqual(v1, v2 Value) bool {
	return Less(v1,v2) || Equal(v1, v2)
}