1 files changed, 82 insertions, 0 deletions
diff --git a/common.js b/common.js
new file mode 100644
index 0000000..e77db07
--- /dev/null
+++ b/common.js
@@ -0,0 +1,82 @@
+var W=8,H=9;
+
+if(typeof module=="undefined")module=false; //hack to support client-side importing
+
+if(module)module.exports["emptyboard"]=emptyboard;
+function emptyboard(){
+	return new Array(H).fill(0).map(function(){
+		return new Array(W).fill(0).map(function(){
+			return {n:0,c:0};
+		});
+	});
+}
+
+if(module)module.exports["bdcopy"]=bdcopy;
+function bdcopy(bd){
+	return bd.map(function(r){
+		return r.map(function(c){
+			return {n:c.n,c:c.c};
+		});
+	});
+}
+
+if(module)module.exports["checkwin"]=checkwin;
+function checkwin(bd){
+	var wincolour=-1,i;
+	for(i=0;i<W*H;i++){
+		if(bd[~~(i/W)][i%W].n){
+			if(wincolour==-1)wincolour=bd[~~(i/W)][i%W].c
+			else if(bd[~~(i/W)][i%W].c!=wincolour)return -1;
+		}
+	}
+	return wincolour;
+}
+
+if(module)module.exports["countballs"]=countballs;
+function countballs(bd,p){
+	var count=0;
+	var x,y;
+	if(p==undefined){
+		for(y=0;y<H;y++)for(x=0;x<W;x++)count+=bd[y][x].n;
+	} else {
+		for(y=0;y<H;y++)for(x=0;x<W;x++)count+=bd[y][x].n*(bd[y][x].c==p);
+	}
+	return count;
+}
+
+if(module)module.exports["stabilise"]=stabilise;
+function stabilise(bd){
+	var newbd;
+	var changes;
+	var x,y,nnei,quo;
+	do {
+		changes=false;
+		newbd=bdcopy(bd);
+		for(y=0;y<H;y++){
+			for(x=0;x<W;x++){
+				nnei=(y>0)+(x>0)+(y<H-1)+(x<W-1);
+				if(bd[y][x].n>=nnei){
+					quo=~~(bd[y][x].n/nnei);
+					newbd[y][x].n-=quo*nnei;
+					if(y>0)  {newbd[y-1][x].n+=quo;newbd[y-1][x].c=bd[y][x].c;}
+					if(x>0)  {newbd[y][x-1].n+=quo;newbd[y][x-1].c=bd[y][x].c;}
+					if(y<H-1){newbd[y+1][x].n+=quo;newbd[y+1][x].c=bd[y][x].c;}
+					if(x<W-1){newbd[y][x+1].n+=quo;newbd[y][x+1].c=bd[y][x].c;}
+					changes=true;
+				}
+			}
+		}
+		bd=newbd;
+		if(checkwin(bd)!=-1)break;
+	} while(changes);
+	return bd;
+}
+
+
+
+if(module)module.exports["validatenick"]=validatenick;
+function validatenick(nick){
+	return /^[a-zA-Z0-9_-]{3,}$/.test(nick);
+}
+
+Array.prototype.fill=Array.prototype.fill||function(t){if(null==this)throw new TypeError("this is null or not defined");for(var r=Object(this),n=r.length>>>0,i=arguments[1],a=i>>0,e=0>a?Math.max(n+a,0):Math.min(a,n),o=arguments[2],h=void 0===o?n:o>>0,l=0>h?Math.max(n+h,0):Math.min(h,n);l>e;)r[e]=t,e++;return r};