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QianMoQianMo
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add Interpreter Design Pattern example
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‎Assembly-CSharp.csproj‎

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<Compile Include="Assets\Behavioral Patterns\Chain of Responsibility Pattern\Example1\ChainOfResponsibilityExample1.cs" />
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<Compile Include="Assets\Structural Patterns\Proxy Pattern\Exmaple1\ProxyPatternExample1.cs" />
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<Compile Include="Assets\Structural Patterns\Proxy Pattern\Structure\ProxyStructure.cs" />
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‎Assets/Behavioral Patterns/Interpreter Pattern/Example2.meta‎

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‎Assets/Behavioral Patterns/Interpreter Pattern/Example2/InterpreterExample2.cs‎

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//-------------------------------------------------------------------------------------
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// InterpreterExample2.cs
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//-------------------------------------------------------------------------------------
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using System;
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using UnityEngine;
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using System.Collections;
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using System.Globalization;
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using System.Reflection;
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public class InterpreterExample2 : MonoBehaviour
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{
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void Start ( )
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{
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string question1 = "2 Gallons to pints";
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AskQuestion(question1);
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string question2 = "4 Gallons to tablespoons";
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AskQuestion(question2);
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}
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protected void AskQuestion(string question)
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{
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ConversionContext context = new ConversionContext(question);
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string fromConversion = context.fromConversion; // in this example fromConversion is always the second word
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string toConversion = context.toConversion;
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double quantity = context.quantity;
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// Trying to get a matching class for the word "fromConversion"
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try
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{
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// Getting the type, we also have to define the namespace (in this case InterpreterPattern as defined above)
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// and fromConversion should hold the class name (in this case Gallons)
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Type type = Type.GetType("InterpreterPattern." + fromConversion);
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object instance = Activator.CreateInstance(type);
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Expression expression = instance as Expression;
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// Get the matching method: e.g. (toConversion = pints)
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MethodInfo method = type.GetMethod(toConversion);
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string result = (string)method.Invoke(instance, new object[] { quantity });
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Debug.Log("Output: " + quantity.ToString() + " " + fromConversion + " are " + result + " " + toConversion);
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}
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catch (Exception e)
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{
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Debug.Log(e.Message);
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}
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}
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}
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// Context object that does try to make sense of an input string:
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public class ConversionContext
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{
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public string conversionQues { get; protected set; }
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public string fromConversion { get; protected set; }
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public string toConversion { get; protected set; }
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public double quantity { get; protected set; }
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protected string[] partsOfQues;
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// here happens the sensemaking
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public ConversionContext(string input)
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{
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Debug.Log("Input: " + input);
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this.conversionQues = input;
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this.partsOfQues = input.Split(new string[] { " " }, System.StringSplitOptions.RemoveEmptyEntries);
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if (partsOfQues.Length >= 4)
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{
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fromConversion = GetCapitalized(partsOfQues[1]);
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// 1 gallon to pints
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toConversion = GetLowerCase(partsOfQues[3]);
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// get quantitiy:
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double quant;
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double.TryParse(partsOfQues[0], out quant);
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this.quantity = quant;
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}
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}
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// Some helper methods:
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protected string GetCapitalized(string word)
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{
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word = word.ToLower();
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word = CultureInfo.CurrentCulture.TextInfo.ToTitleCase(word);
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// make sure a 's' is appended
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if (word.EndsWith("s") == false)
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{
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word += "s";
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}
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return word;
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}
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protected string GetLowerCase(string word)
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{
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return word.ToLower();
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}
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}
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// Definition of all the things the concrete expression
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// shall be able to convert into
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public abstract class Expression
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{
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public abstract string gallons(double quantity);
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public abstract string quarts(double quantity);
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public abstract string pints(double quantity);
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public abstract string cups(double quantity);
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public abstract string tablespoons(double quantity);
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}
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// concrete class
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public class Gallons : Expression
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{
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#region implemented abstract members of Expression
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public override string gallons(double quantity)
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{
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return quantity.ToString();
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}
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public override string quarts(double quantity)
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{
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return (quantity * 4).ToString();
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}
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public override string pints(double quantity)
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{
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return (quantity * 8).ToString();
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}
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public override string cups(double quantity)
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{
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return (quantity * 16).ToString();
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}
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public override string tablespoons(double quantity)
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{
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return (quantity * 256).ToString();
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}
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#endregion
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}

‎Assets/Behavioral Patterns/Interpreter Pattern/Example2/InterpreterExample2.cs.meta‎

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‎Assets/Behavioral Patterns/Interpreter Pattern/Example2/InterpreterExample2.unity‎

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‎Assets/Behavioral Patterns/Interpreter Pattern/Example2/InterpreterExample2.unity.meta‎

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