package compiler;
import java.io.File;

public class Compiler{
	protected CompilerFactory factory;
	protected Lexer lexer;
	protected Parser parser;
	protected PrettyPrinter prettyprinter;
	protected Generator gen;

	public Compiler (String languageName) throws Exception{
		factory = CompilerFactory.getFactory(languageName);
		lexer = factory.createLexer();
		parser = factory.createParser();
		gen = factory.createGenerator();
		}
	
	public void compile(ProgramText t){
		System.out.println("Compiling a: " + factory.getLanguage() + " program.");
		ScanedText t2 = lexer.scan(t);
		AST tree = parser.parse(t2);
		File f = gen.generate(tree);
		System.out.println("Compilation finished");
	}

	public static void main(String[] args) {
		
		/*generates the following output :
			-----------------------
			Compiling a: Java program.
			I am scanning a Java program text
			I am parsing a Java scaned text
			I am generating a JVM program text from a Java AST
			Compilation finished
			-----------------------
			Compiling a: C++ program.
			I am scanning a C++ program text
			I am parsing a C++ scaned text
			I am generating an assembler program text from a C++ AST
			Compilation finished
			-----------------------
			Non supported Language : ADA, Extend the framework to support it	*/
			
		try{
			System.out.println("-----------------------");
			Compiler c1 = new Compiler("Java");
			c1.compile(new ProgramText("..."));
			System.out.println("-----------------------");
			Compiler c2 = new Compiler ("C++");
			c2.compile(new ProgramText("..."));
			System.out.println("-----------------------");
			Compiler c3 = new Compiler("ADA");
		}
		catch(Exception e){System.out.println(e.getMessage());}
	}
}

abstract class Lexer {public abstract ScanedText scan(ProgramText t);};
abstract class Parser{public abstract AST parse(ScanedText t);}
abstract class Generator{public abstract File generate(AST a);}
abstract class PrettyPrinter{public abstract ProgramText prettyPrint(AST a);}

class ProgramText{
	String text;
	ProgramText(String t){text = t;}
}

class ScanedText{}

class AST{}