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/*

File LeapfrogSquare.m

These are the squares used for leapfrog search.  When backjumping past a square, the square remembers its current value and tries that value first the next time through.

*/

#import <appkit/appkit.h>

#import "Leapfrog.h"
#import "Crossword.h"
#import "Puzzle.h"


/* ÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐ  */


#define position(i)		((wordPosition *) [words  elementAt: i])
#define forword(c)		((c) == WILDCARD ? (c):(c) + 'a')
#define forcell(c)		((c) == WILDCARD ? EMPTY:(c) + 'A')


/* ÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐ  */


@implementation LeapfrogSquare


- initPuzzle: (id) thePuzzle  cell: (id) theCell
{
	[super  initPuzzle: thePuzzle  cell: theCell];
	last = WILDCARD;
	
	return self;
}


- show
{
	char	symbol;
	
	symbol = (last == WILDCARD) ? letter:last;
	[[puzzle  getCrossword]  putLetter: forcell(symbol)  inSquare: cell];
	DPSFlush();
	
	return self;
}


- (char) chooseLetter
{
	char	best;
	
	if ((last != WILDCARD) && (count[last] != 0))
	{
		[self  clearStatus: JUMPED];
		best = last;
		last = WILDCARD;
	}
	
	else
	{
		last = letter;
		best = [super  chooseLetter];
		if (!injump) last = WILDCARD;
	}
	
	return best;
}


/* ÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐÐ  */


- update
{
	[super  update];
	
	if ((last != WILDCARD) && (count[last] == 0))
	{
		last = WILDCARD;
		[self  show];
	}
	
	return self;
}


@end

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.