Interpreter in C#
Why read if you can watch?
Watch Interpreter's video tutorialGiven a language, defines a representation for its grammar along with an interpreter that uses the representation to interpret sentences in the language.
This structural code demonstrates the Interpreter patterns, which using a defined grammer, provides the interpreter that processes parsed statements.
using System;
using System.Collections;
class MainApp
{
static void Main()
{
Context context = new Context();
// Usually a tree
ArrayList list = new ArrayList();
// Populate 'abstract syntax tree'
list.Add(new TerminalExpression());
list.Add(new NonterminalExpression());
list.Add(new TerminalExpression());
list.Add(new TerminalExpression());
// Interpret
foreach (AbstractExpression exp in list)
{
exp.Interpret(context);
}
// Wait for user
Console.Read();
}
}
// "Context"
class Context
{
}
// "AbstractExpression"
abstract class AbstractExpression
{
public abstract void Interpret(Context context);
}
// "TerminalExpression"
class TerminalExpression : AbstractExpression
{
public override void Interpret(Context context)
{
Console.WriteLine("Called Terminal.Interpret()");
}
}
// "NonterminalExpression"
class NonterminalExpression : AbstractExpression
{
public override void Interpret(Context context)
{
Console.WriteLine("Called Nonterminal.Interpret()");
}
}
Called Terminal.Interpret()
Called Nonterminal.Interpret()
Called Terminal.Interpret()
Called Terminal.Interpret()
