Interpreter in VB.NET
A way to include language elements in a program
ReturnGiven a language, define a representation for its grammar along with an interpreter that uses the representation to interpret sentences in the language. Interpreter patterns, which using a defined grammer, provides the interpreter that processes parsed statements.
Please download project with this source code from https://github.com/ViacheslavUKR/StandardDisignOopPattern
1: ' Interpreter Design Pattern.
2: ' See description in //www.vb-net.com/ProgramTheory/Interpreter.htm
3: Class MainApp
4: ' Entry point into console application.
5: Public Shared Sub Main()
6: Dim context As New Context()
7: ' Usually a tree
8: Dim list As New ArrayList()
9: ' Populate 'abstract syntax tree'
10: list.Add(New TerminalExpression())
11: list.Add(New NonterminalExpression())
12: list.Add(New TerminalExpression())
13: list.Add(New TerminalExpression())
14: ' Interpret
15: For Each exp As AbstractExpression In list
16: exp.Interpret(context)
17: Next
18: ' Wait for user
19: Console.ReadKey()
20: End Sub
21: End Class
22:
23: ' The 'Context' class
24: Class Context
25: End Class
26:
27: ' The 'AbstractExpression' abstract class
28: MustInherit Class AbstractExpression
29: Public MustOverride Sub Interpret(context As Context)
30: End Class
31:
32: ' The 'TerminalExpression' class
33: Class TerminalExpression
34: Inherits AbstractExpression
35: Public Overrides Sub Interpret(context As Context)
36: Console.WriteLine("Called Terminal.Interpret()")
37: End Sub
38: End Class
39:
40: ' The 'NonterminalExpression' class
41: Class NonterminalExpression
42: Inherits AbstractExpression
43: Public Overrides Sub Interpret(context As Context)
44: Console.WriteLine("Called Nonterminal.Interpret()")
45: End Sub
46: End Class
See also:
Creational Patterns
- Abstract Factory in VB.NET - Creates an instance of several families of classes.
- Builder in VB.NET - Separates object construction from its representation.
- Factory Method in VB.NET - Creates an instance of several derived classes.
- Prototype in VB.NET - A fully initialized instance to be copied or cloned.
- Singleton in VB.NET - A class of which only a single instance can exist.
- Adapter in VB.NET - Match interfaces of different classes
- Bridge in VB.NET - Separates an object’s interface from its implementation
- Composite in VB.NET - A tree structure of simple and composite objects
- Decorator in VB.NET - Add responsibilities to objects dynamically
- Facade in VB.NET - A single class that represents an entire subsystem
- Flyweight in VB.NET - A fine-grained instance used for efficient sharing
- Proxy in VB.NET - An object representing another object
- Chain of Resp. in VB.NET - A way of passing a request between a chain of objects
- Command in VB.NET - Encapsulate a command request as an object
- Interpreter in VB.NET - A way to include language elements in a program
- Iterator in VB.NET - Sequentially access the elements of a collection
- Mediator in VB.NET - Defines simplified communication between classes
- Memento in VB.NET - Capture and restore an object's internal state
- Observer in VB.NET - A way of notifying change to a number of classes
- State in VB.NET - Alter an object's behavior when its state changes
- Strategy in VB.NET - Encapsulates an algorithm inside a class
- Template Method in VB.NET - Defer the exact steps of an algorithm to a subclass
- Visitor in VB.NET - Defines a new operation to a class without change
Theory context:
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Link to this page:
//www.vb-net.com/ProgramTheory/Interpreter.htm
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