[WIP, BROKEN] attempt to factorize zone handling to provide tooling to detect contradictions in hypothesis solver (zones becoming empty which shouldn't)

js/Set.js

@@ -21,6 +21,7 @@ function make(type) {
 	Set.prototype.remove = function(e) { delete this.elements[type.toKey(e)]; };
 	Set.prototype.contains = function(e) { return !!this.elements[type.toKey(e)]; };
 	Set.prototype.size = function() { return Object.keys(this.elements).length; };
+	Set.prototype.copy = function() { return new Set(this.toList()); };
 
 	Set.prototype.toList = function() {
 		var result = [];

js/Solver.js

@@ -39,16 +39,8 @@ function applyStep(solvingState) {
 		console.log(step);
 		['empty', 'star'].forEach(function(attribute) {
 			if(step[attribute] != undefined) {
-				step[attribute].iter(function(cell) {
-					set(solvingState.constellation, cell, attribute == 'star');
-					forget(solvingState, cell);
-				});
+				step[attribute].iter(State.setCell(solvingState, attribute == 'star'));
 			}
 		});
 	};
 }
-
-function forget(solvingState, cell) {
-	State.getCellSets(solvingState).concat(solvingState.missing)
-		.forEach(function(cellSet) {cellSet.remove(cell);});
-}

js/Solver/SingleCell.js

@@ -1,17 +1,16 @@
 import * as CellSet from Geometry.CellSet;
-import getCellSets from Solver.State;
 import * as Strategy from Solver.Strategy;
 import {diagonal, getColumn, getRow, plus} from Geometry.Vector;
 
 return {
-	find: find
+	find: find,
+	perimeter: perimeter
 };
 
 function find(solvingState) {
-	var cellSets = getCellSets(solvingState);
 	return Strategy.map(
 		stepOfCell(solvingState.missing),
-		Strategy.tryEach(cellSets.map(getSingleCellIn))
+		Strategy.tryEach(solvingState.colorZones.map(getSingleCellIn))
 	);
 }
 
@@ -27,13 +26,13 @@ function stepOfCell(missing) {
 	return function(cell) {
 		return {
 			reason: 'singleCell',
-			empty: toEmpty(cell).intersection(missing),
+			empty: perimeter(cell).intersection(missing),
 			star: new CellSet.CellSet(cell)
 		};
 	};
 }
 
-function toEmpty(cell) {
+function perimeter(cell) {
 	var union = CellSet.union([
 		CellSet.rectangle(plus(cell, diagonal(-1)), diagonal(3)),
 		CellSet.row(getRow(cell)),

js/Solver/State.js

@@ -1,11 +1,15 @@
+import id from UnitJS.Fun;
 import size from Config;
-import {asAFunction, iter, square} from Grid.Util;
+import {asAFunction, iter, map, set, square} from Grid.Util;
 import {diagonal, zero} from Geometry.Vector;
 import * as CellSet from Geometry.CellSet;
 
+var zoneNames = ['colors', 'rows', 'columns'];
+
 return {
-	getCellSets: getCellSets,
-	start: start
+	setCell: setCell,
+	start: start,
+	fork: fork
 };
 
 function start(coloring) {
@@ -14,25 +18,62 @@ function start(coloring) {
 		constellation: square(size),
 		getColor: asAFunction(coloring),
 		missing: CellSet.rectangle(zero(), diagonal(size)),
-		colorZones: getZones(coloring),
+		zones: {
+			colors: getColors(coloring),
 			rows: empty.map(function(_, i) {return CellSet.row(i);}),
 			columns: empty.map(function(_, i) {return CellSet.column(i);})
+		}
 	};
 }
 
-function getZones(grid) {
-	var zones = Array.from({length: size});
+function getColors(grid) {
+	var colors = Array.from({length: size});
 	iter(grid, function(color, cell) {
-		if(zones[color] == undefined) {
-			zones[color] = new CellSet.CellSet();
+		if(colors[color] == undefined) {
+			colors[color] = new CellSet.CellSet();
 		}
-		zones[color].add(cell);
+		colors[color].add(cell);
 	});
-	return zones;
+	return colors;
 }
 
-function getCellSets(solvingState) {
-	return solvingState.colorZones
-		.concat(solvingState.rows)
-		.concat(solvingState.columns);
+function fork(state) {
+	var zones = {};
+	zoneNames.forEach(function(name) {
+		zones[name] = state.zones[name].map(function(s) {return s.copy();});
+	});
+	return {
+		constellation: map(state.constellation, id),
+		getColor: state.getColor,
+		missing: state.missing.copy(),
+		zones: zones
+	};
+}
+
+function setCells(solvingState, value) {
+	return function(cellSet) {
+		for(var i = 0; i < zoneNames.length; i++) {
+			for(var j = 0; j < size; j++) {
+				f(solvingState.zones[field][j], cellSet)
+			}
+		}
+				var field = zoneNames[i];
+				var zone = solvingState.zones[field][j];
+				if(zone.size() > 0) {
+					var diff = 
+		});
+		solvingState.colorZones
+			.concat(solvingState.rows)
+			.concat(solvingState.columns)
+			.concat(solvingState.missing)
+			.forEach(function(cellSet) {cellSet.remove(cell);});
+		solvingState.missing
+		set(solvingState.constellation, cell, value);
+}
+
+function f(zone, cellSet) {
+	if(zone.size() > 0) {
+		var diff = zone.difference(cellSet);
+		if(diff.
+	}
 }