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else if ((element is Midterm || element is Exam) && element.Part==null) { context.Output += values[n]*element.Weight; n++; } if (element.Part!=null) Interpreter(element.Part.Next); if (element.Next!=null) Interpreter(element.Next); } } public class Element { public int Weight {get; set;} public Element Next {get; set;} public Element Part {get; set;} public virtual string Display( ) { return Weight+"%"; } int GetNumber (Context context) { int atSpace = context.Input.IndexOf(' '); int number = Int32.Parse(context.Input.Substring(1,atSpace)); context.Input = context.Input.Substring(atSpace+1); return number; } public void Parse (Context context) { string starters = "LTME"; if (context.Input.Length>0 && starters.IndexOf(context.Input[0])>=0) { switch(context.Input[0]) { case 'L': Next=new Lab( ); break; case 'T': Next=new Test( ); break; case 'M': Next=new Midterm( ); break; case 'E': Next = new Exam( ); break; } Next.Weight = GetNumber(context); if (context.Input.Length>0 && context.Input[0]=='(') { context.Input = context.Input.Substring(1); Next.Part = new Element( ); Next.Part.Parse(context); Element e = Next.Part; while (e!=null) {
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e.Weight = e.Weight * Next.Weight / 100; e = e.Next; } context.Input = context.Input.Substring(2); } Next.Parse(context); } } } class Course : Element { public string Name {get; set;} public Course (Context context) { Name = context.Input.Substring(0,6); context.Input = context.Input.Substring(7); } public override string Display( ) { return Name; } } class Lab : Element { } class Test : Element { } class Midterm : Element { } class Exam : Element { } public class Context { public string Input {get; set;} public double Output {get; set;} public Context(string c) { Input = c; Output = 0; } } static class IntArrayExtension { public static string Display (this int[] a) { string s = "["; foreach (int i in a) s+=i+", "; return s.Substring(0,s.Length-2)+"]"; } } class InterpreterPattern {
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static void Main( ) { string rules = "COS333 L2 L2 L2 L2 L2 M25 (L40 T60 ) L10 E55 (L28 T73 ) "; int [][] values = new [] {new [] {80,0,100,100,85,51,52,50,57,56}, new [] {87,95,100,100,77,70,99,100,75,94}, new [] {0,55,100,65,55,75,73,74,71,72}}; Context context; Console.WriteLine (rules+"\n"); context = new Context (rules); Element course = new Course(context); course.Parse(context); Console.WriteLine("Visitor 1 - Course structure\n"); course.Print( ); course.Summarize( ); Console.WriteLine ("\n\nVisitor 2 - Summing the weights\nLabs " +ElementExtensions.Lab + "% and Tests " +ElementExtensions.Test + "%"); Console.WriteLine("\n\nVisitor 3 (Interpreter) "); foreach (int [] student in values) { Console.Write(student.Display( )); course.SetUp(context, student); course.Interpreter( ); Console.WriteLine(" = "+context.Output/100); } } } /* Output COS333 L2 L2 L2 L2 L2 M25 (L40 T60 ) L10 E55 (L28 T73 ) Visitor 1 - Course structure Course 0 Lab 2 Lab 2 Lab 2 Lab 2 Lab 2 Midterm 25 Lab 10 Test 15 Lab 10 Exam 55 Lab 15 Test 40
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Visitor 2 - Summing the weights Labs 45% and Tests 55%
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Visitor 3 (Interpreter) [80, 0, 100, 100, 85, 51, 52, 50, 57, 56] = 56.15 [87, 95, 100, 100, 77, 70, 99, 100, 75, 94] = 89.88 [0, 55, 100, 65, 55, 75, 73, 74, 71, 72] = 70.8 */
Interpreter Pattern Example Code Mirrors
See the following code for another example of the Intrepreter Pattern:
using using using using using using System; System.Xml; System.Reflection; System.Collections; System.Collections.Generic; System.Windows.Forms;
public class Mirror { // // // // // // Mirrors Hans Lombard June 2006, revised Sept 2007 Based on Views and Views-2 by Nigel Horspool, Judith Bishop, and D-J Miller A general-purpose interpreter for any .NET API Reads XML and executes the methods it represents This example assumes the Windows Form API only in the final line where Application.Run is called
Stack objectStack; List<Command> commands; public object CurrentObject { get { return objectStack.Peek( ); } } public XmlTextReader Reader { get; set; } public object LastObject { get; set; } public Mirror(string spec) { objectStack = new Stack( ); objectStack.Push(null); // Register the commands commands = new List<Command>( ); commands.Add(new ElementCommand( )); commands.Add(new EndElementCommand( )); commands.Add(new AttributeCommand( )); Reader = new XmlTextReader(spec); while (Reader.Read( )) { InterpretCommands( ); bool b = Reader.IsEmptyElement; if (Reader.HasAttributes) { for (int i = 0; i < Reader.AttributeCount; i++) { Reader.MoveToAttribute(i); InterpretCommands( ); } }
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