基於JavaScript的公式解譯器 – 9 【邏輯操作符的實現】

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邏輯操作符的基底類型

邏輯操作符包括一元和二元類型,因此有兩個基底類型

檔案:OperatorLogicBase.js

function OperatorBinaryLogicBase() {<br /> this.DeriveFrom(new OperatorBinaryBase());<br /> this.set_ClassName("OperatorBinaryLogicBase");<br /> this.set_Sign("undefined");<br />};</p><p>function OperatorUnaryLogicBase() {<br /> this.DeriveFrom(new OperatorUnaryBase());<br /> this.set_ClassName("OperatorUnaryLogicBase");<br /> this.set_Sign("undefined");<br />};

 

邏輯操作符的實現

檔案:OperatorLogic.js

function OperatorLogicAnd() {<br /> this.DeriveFrom(new OperatorBinaryLogicBase());<br /> this.set_ClassName("OperatorLogicAnd");<br /> this.set_Sign("&&");<br />};</p><p>OperatorLogicAnd.prototype.Evaluate = function(operands) {<br /> var values = this._getTwoNumberOperands(operands);</p><p> return new OperandBoolean(values[0].get_Value() && values[1].get_Value());<br />};</p><p>function OperatorLogicOr() {<br /> this.DeriveFrom(new OperatorBinaryLogicBase());<br /> this.set_ClassName("OperatorLogicOr");<br /> this.set_Sign("||");<br />};</p><p>OperatorLogicOr.prototype.Evaluate = function(operands) {<br /> var values = this._getTwoNumberOperands(operands);</p><p> return new OperandBoolean(values[0].get_Value() || values[1].get_Value());<br />};</p><p>function OperatorLogicNot() {<br /> this.DeriveFrom(new OperatorUnaryLogicBase());<br /> this.set_ClassName("OperatorLogicOr");<br /> this.set_Sign("!");<br />};</p><p>OperatorLogicNot.prototype.Evaluate = function(operands) {<br /> var val = this.GetOneNumberOperand(operands);</p><p> return new OperandBoolean(!val.get_Value());<br />};<br />

 

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