add sheet formula

cell/model/FormulaObjects/_xlfnFunctions.js

@@ -60,12 +60,12 @@
 	cFormulaFunctionGroup['LookupAndReference'] = cFormulaFunctionGroup['LookupAndReference'] || [];
 	cFormulaFunctionGroup['LookupAndReference'].push(cFORMULATEXT);
 	cFormulaFunctionGroup['Information'] = cFormulaFunctionGroup['Information'] || [];
-	cFormulaFunctionGroup['Information'].push(cSHEET, cSHEETS);
+	cFormulaFunctionGroup['Information'].push(cSHEETS);
 
 	cFormulaFunctionGroup['NotRealised'] = cFormulaFunctionGroup['NotRealised'] || [];
 	cFormulaFunctionGroup['NotRealised'].push(cDBCS, cUNICHAR, cUNICODE, cF_TEST, cFORECAST_ETS,
 		cFORECAST_ETS_CONFINT, cFORECAST_ETS_SEASONALITY, cFORECAST_ETS_STAT, cHYPGEOM_DIST, cPDURATION,
-		cMUNIT, cFORMULATEXT, cSHEET, cSHEETS);
+		cMUNIT, cFORMULATEXT, cSHEETS);
 
 	/**
 	 * @constructor
@@ -211,18 +211,6 @@
 	cQUERYSTRING.prototype = Object.create(cBaseFunction.prototype);
 	cQUERYSTRING.prototype.constructor = cQUERYSTRING;
 
-	/**
-	 * @constructor
-	 * @extends {AscCommonExcel.cBaseFunction}
-	 */
-	function cSHEET() {
-		cBaseFunction.call(this, "SHEET");
-		this.isXLFN = true;
-	}
-
-	cSHEET.prototype = Object.create(cBaseFunction.prototype);
-	cSHEET.prototype.constructor = cSHEET;
-
 	/**
 	 * @constructor
 	 * @extends {AscCommonExcel.cBaseFunction}

cell/model/FormulaObjects/informationFunctions.js

@@ -49,10 +49,11 @@
 	var cArray = AscCommonExcel.cArray;
 	var cBaseFunction = AscCommonExcel.cBaseFunction;
 	var cFormulaFunctionGroup = AscCommonExcel.cFormulaFunctionGroup;
+	var cElementType = AscCommonExcel.cElementType;
 
 	cFormulaFunctionGroup['Information'] = cFormulaFunctionGroup['Information'] || [];
 	cFormulaFunctionGroup['Information'].push(cERROR_TYPE, cISBLANK, cISERR, cISERROR, cISEVEN, cISFORMULA, cISLOGICAL, cISNA,
-		cISNONTEXT, cISNUMBER, cISODD, cISREF, cISTEXT, cN, cNA, cTYPE);
+		cISNONTEXT, cISNUMBER, cISODD, cISREF, cISTEXT, cN, cNA, cSHEET, cTYPE);
 
 	/**
 	 * @constructor
@@ -547,6 +548,38 @@
 		return this.value = new cError(cErrorType.not_available);
 	};
 
+	/**
+	 * @constructor
+	 * @extends {AscCommonExcel.cBaseFunction}
+	 */
+	function cSHEET() {
+		this.name = "SHEET";
+		this.value = null;
+		this.argumentsCurrent = 0;
+	}
+
+	cSHEET.prototype = Object.create(cBaseFunction.prototype);
+	cSHEET.prototype.constructor = cSHEET;
+	cSHEET.prototype.argumentsMin = 0;
+	cSHEET.prototype.argumentsMax = 1;
+	cSHEET.prototype.isXLFN = true;
+	cSHEET.prototype.Calculate = function (arg, opt_bbox, opt_defName, ws) {
+
+		var res;
+		if(0 === arg.length){
+			res = new cNumber(ws.nSheetId);
+		}else{
+			var arg0 = arg[0];
+			if(cElementType.error === arg0.type){
+				res = arg0;
+			}else{
+				res = new cNumber(arg[0].ws.nSheetId);
+			}
+		}
+		return this.value = res;
+
+	};
+
 	/**
 	 * @constructor
 	 * @extends {AscCommonExcel.cBaseFunction}