ftp.nice.ch/pub/next/developer/objc/appkit/Crossword.1.1.NIHS.bs.tar.gz#/Crossword.1.1.NIHS.bs/Source/BackjumpState.m

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/*

File BackjumpState.m

This state is used for backjumping search.  The state can keep track of a single nogood.

*/

#import <appkit/appkit.h>

#import "Backjump.h"


/* ÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐ  */


@implementation BackjumpState

- squareClass			{	return [BackjumpSquare  class];		}
- wordClass				{	return [BackjumpWord  class];		}
- (BOOL) inNogood		{	return nogood;						}


/* ÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐ  */


- initPuzzle: (id) thePuzzle
{
	[super  initPuzzle: thePuzzle];
	nogoodWords = [[List  alloc]  init];
	nogood = NO;
	
	return self;
}


- free
{
	[nogoodWords  free];
	return [super  free];
}


- mustChange: (id) word
{
	[word  mark];
	[nogoodWords  addObject: word];
	nogood = YES;
	
	return self;
}


- isok
{
	if (nogood)
	{
		[nogoodWords  makeObjectsPerform: @selector(clear)];
		[nogoodWords  empty];
		nogood = NO;
	}
	
	return self;
}


@end

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