mirror of
https://github.com/crazybber/go-pattern-examples.git
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148 lines
3.1 KiB
Go
148 lines
3.1 KiB
Go
package interpreter
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import (
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"fmt"
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"strings"
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)
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//用会议交流的例子，规则如下:
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// A表示左边发言者，B表示右边发言者
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// A "->" B 表示 A说，B听,此时B不能发言。
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// A "<-" B 表示 B说，A听,此时B不能发言。
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// A "<->" B 表示 A 和 B 可以自由发言。
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//IActionInterpret 解释器
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type IActionInterpret interface {
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Interpret()
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}
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//SpeakerUnit 每个参与动作的单元都是，会议发言者
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type SpeakerUnit struct {
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Name string
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CanSpeak bool //每个参会者有两种基本的行为，发言或者安静
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}
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//Interpret 解释自己的基本行为
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func (s *SpeakerUnit) Interpret() {
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if s.CanSpeak {
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fmt.Println("i'm", s.Name, "i’m speaking")
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return
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}
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fmt.Println("i'm", s.Name, "already silent")
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}
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//LeftSpeakAction ：A "->" B 表示 A说，B听,此时B不能发言。
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type LeftSpeakAction struct {
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leftSpeaker, rightSpeaker IActionInterpret
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}
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//Interpret 解释执行
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func (l *LeftSpeakAction) Interpret() {
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l.leftSpeaker.Interpret()
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l.rightSpeaker.Interpret()
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}
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//RightSpeakAction ：A "<-" B 表示 B说，A听,此时B不能发言。
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type RightSpeakAction struct {
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leftSpeaker, rightSpeaker IActionInterpret
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}
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//Interpret 解释执行
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func (r *RightSpeakAction) Interpret() {
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r.leftSpeaker.Interpret()
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r.rightSpeaker.Interpret()
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}
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//BothSpeakAction : A "<->" B 表示 A 和 B 可以自由发言。
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type BothSpeakAction struct {
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leftSpeaker, rightSpeaker IActionInterpret
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}
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//Interpret 解释执行
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func (b *BothSpeakAction) Interpret() {
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b.leftSpeaker.Interpret()
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b.rightSpeaker.Interpret()
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}
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//SignParser 我们自己的DSL解析器
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type SignParser struct {
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actionUnits []string //要解析的内容
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result IActionInterpret //上一个也是解释器单元
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}
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//解析 ->
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func (s *SignParser) newLeftSpeakAction() IActionInterpret {
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left := &SpeakerUnit{
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Name: s.actionUnits[0],
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CanSpeak: true,
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}
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right := &SpeakerUnit{
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Name: s.actionUnits[2],
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}
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return &LeftSpeakAction{
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leftSpeaker: left,
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rightSpeaker: right,
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}
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}
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//解析 <-
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func (s *SignParser) newRightSpeakAction() IActionInterpret {
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left := &SpeakerUnit{
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Name: s.actionUnits[0],
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}
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right := &SpeakerUnit{
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Name: s.actionUnits[2],
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CanSpeak: true,
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}
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return &LeftSpeakAction{
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leftSpeaker: left,
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rightSpeaker: right,
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}
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}
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//解析 <->
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func (s *SignParser) newBothSpeakAction() IActionInterpret {
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left := &SpeakerUnit{
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Name: s.actionUnits[0],
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CanSpeak: true,
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}
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right := &SpeakerUnit{
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Name: s.actionUnits[2],
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CanSpeak: true,
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}
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return &LeftSpeakAction{
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leftSpeaker: left,
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rightSpeaker: right,
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}
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}
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//Parse 标识解析器进行解析，exp就是要解释的内容
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func (s *SignParser) Parse(exp string) {
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s.actionUnits = strings.Split(exp, " ") //单元分割符
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switch s.actionUnits[1] {
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case "->":
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s.result = s.newLeftSpeakAction()
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case "<-":
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s.result = s.newRightSpeakAction()
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case "<->":
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s.result = s.newBothSpeakAction()
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default:
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fmt.Println("some error raised")
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}
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}
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//Result 就是两边正确执行了动作
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func (s *SignParser) Result() {
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s.result.Interpret()
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}
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