Interpreter Pattern

Author: skillnull

Example/Interpreter-Pattern.js

@@ -1 +1,55 @@
-// 解释器模式(Interpreter Pattern)
+// 解释器模式(Interpreter Pattern)
+
+// 定义对于语法的断言
+class TerminalExpression {
+ constructor (data) {
+ this.data = data
+ }
+
+ interpret (context) {
+ if (context.indexOf(this.data) > -1) {
+ return true
+ }
+ return false
+ }
+}
+
+// 添加表达式判断符
+class OrExpression {
+ constructor(expr1, expr2) {
+ this.expr1 = expr1;
+ this.expr2 = expr2;
+ }
+ interpret(context) {
+ return this.expr1.interpret(context) || this.expr2.interpret(context);
+ }
+}
+class AndExpression {
+ constructor(expr1, expr2) {
+ this.expr1 = expr1;
+ this.expr2 = expr2;
+ }
+ interpret(context) {
+ return this.expr1.interpret(context) && this.expr2.interpret(context);
+ }
+}
+
+
+// 获取对应表达式
+function getMaleExpression(){
+ const robert = new TerminalExpression("Robert");
+ const john = new TerminalExpression("John");
+ return new OrExpression(robert, john);
+}
+function getMarriedWomanExpression(){
+ const julie = new TerminalExpression("Julie");
+ const married = new TerminalExpression("Married");
+ return new AndExpression(julie, married);
+}
+
+
+// 判断语句断言
+const isMale = getMaleExpression();
+const isMarriedWoman = getMarriedWomanExpression();
+console.log("John is male? " + isMale.interpret("John"));
+console.log("Julie is a married women? " )