add ISFORMULA formula

cell/model/FormulaObjects/_xlfnFunctions.js

@@ -64,13 +64,13 @@
 	cFormulaFunctionGroup['LookupAndReference'] = cFormulaFunctionGroup['LookupAndReference'] || [];
 	cFormulaFunctionGroup['LookupAndReference'].push(cFORMULATEXT);
 	cFormulaFunctionGroup['Information'] = cFormulaFunctionGroup['Information'] || [];
-	cFormulaFunctionGroup['Information'].push(cISFORMULA, cSHEET, cSHEETS);
+	cFormulaFunctionGroup['Information'].push(cSHEET, cSHEETS);
 
 	cFormulaFunctionGroup['NotRealised'] = cFormulaFunctionGroup['NotRealised'] || [];
 	cFormulaFunctionGroup['NotRealised'].push(cDAYS, cISOWEEKNUM, cBITAND, cBITLSHIFT, cBITOR, cBITRSHIFT, cBITXOR,
 		cDBCS, cUNICHAR, cUNICODE, cBINOM_DIST_RANGE, cF_TEST, cFORECAST_ETS, cFORECAST_ETS_CONFINT,
 		cFORECAST_ETS_SEASONALITY, cFORECAST_ETS_STAT, cHYPGEOM_DIST, cPDURATION,
-		cAGGREGATE, cMUNIT, cFORMULATEXT, cISFORMULA, cSHEET, cSHEETS);
+		cAGGREGATE, cMUNIT, cFORMULATEXT, cSHEET, cSHEETS);
 
 	/**
 	 * @constructor
@@ -288,18 +288,6 @@
 	cHYPGEOM_DIST.prototype = Object.create(cBaseFunction.prototype);
 	cHYPGEOM_DIST.prototype.constructor = cHYPGEOM_DIST;
 
-	/**
-	 * @constructor
-	 * @extends {AscCommonExcel.cBaseFunction}
-	 */
-	function cISFORMULA() {
-		cBaseFunction.call(this, "ISFORMULA");
-		this.isXLFN = true;
-	}
-
-	cISFORMULA.prototype = Object.create(cBaseFunction.prototype);
-	cISFORMULA.prototype.constructor = cISFORMULA;
-
 	/**
 	 * @constructor
 	 * @extends {AscCommonExcel.cBaseFunction}

cell/model/FormulaObjects/informationFunctions.js

@@ -51,7 +51,7 @@
 	var cFormulaFunctionGroup = AscCommonExcel.cFormulaFunctionGroup;
 
 	cFormulaFunctionGroup['Information'] = cFormulaFunctionGroup['Information'] || [];
-	cFormulaFunctionGroup['Information'].push(cERROR_TYPE, cISBLANK, cISERR, cISERROR, cISEVEN, cISLOGICAL, cISNA,
+	cFormulaFunctionGroup['Information'].push(cERROR_TYPE, cISBLANK, cISERR, cISERROR, cISEVEN, cISFORMULA, cISLOGICAL, cISNA,
 		cISNONTEXT, cISNUMBER, cISODD, cISREF, cISTEXT, cN, cNA, cTYPE);
 
 	/**
@@ -240,6 +240,37 @@
 		}
 	};
 
+	/**
+	 * @constructor
+	 * @extends {AscCommonExcel.cBaseFunction}
+	 */
+	function cISFORMULA() {
+		this.name = "ISFORMULA";
+		this.value = null;
+		this.argumentsCurrent = 0;
+	}
+
+	cISFORMULA.prototype = Object.create(cBaseFunction.prototype);
+	cISFORMULA.prototype.constructor = cISFORMULA;
+	cISFORMULA.prototype.argumentsMin = 1;
+	cISFORMULA.prototype.argumentsMax = 1;
+	cISFORMULA.prototype.Calculate = function (arg) {
+		//есть различия в поведении этой формулы для ms и lo(для нескольких ячеек с данными)
+		var arg0 = arg[0];
+		var res = false;
+		if ((arg0 instanceof cArea || arg0 instanceof cArea3D) && arg0.range) {
+			res = arg0.range.isFormula();
+		}else if ((arg0 instanceof cRef || arg0 instanceof cRef3D) && arg0.range) {
+			res = arg0.range.isFormula();
+		}
+
+		if (arg0 instanceof cError) {
+			return this.value = arg0;
+		}
+
+		return this.value = new cBool(res);
+	};
+
 	/**
 	 * @constructor
 	 * @extends {AscCommonExcel.cBaseFunction}