math-expression-evaluator - npm Package Compare versions

Comparing version 1.2.17 to 1.2.18

dist/browser/math-expression-evaluator.js

 /** math-expression-evaluator version 1.2.17
- Dated:2017-04-28 */
+ Dated:2017-05-05 */
 
@@ -47,433 +47,522 @@ (function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.mexp = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
 },{"./postfix_evaluator.js":5}],2:[function(require,module,exports){
-var Mexp=require('./math_function.js');
-	function inc(arr,val){
-		for(var i=0;i<arr.length;i++)
-			arr[i]+=val;
-		return arr;
-	}
-	var token=['sin','cos','tan','pi','(',')','P','C',
-		  'asin','acos','atan','7','8','9','int',
-		  'cosh','acosh','ln','^','root','4','5','6','/','!',
-		  'tanh','atanh','Mod','1','2','3','*',
-		  'sinh','asinh','e','log','0','.','+','-',',','Sigma','n','Pi','pow'];
-	var show=['sin','cos','tan','&pi;','(',')','P','C',
-		'asin','acos','atan','7','8','9','Int',
-		'cosh','acosh',' ln','^','root','4','5','6','&divide;','!',
-		'tanh','atanh',' Mod ','1','2','3','&times;',
-		'sinh','asinh','e',' log','0','.','+','-',',','&Sigma;','n','&Pi;','pow'];
-	var eva=[Mexp.math.sin,Mexp.math.cos,Mexp.math.tan,'PI','(',')',Mexp.math.P,Mexp.math.C,
-		Mexp.math.asin,Mexp.math.acos,Mexp.math.atan,'7','8','9',Math.floor,
-		Mexp.math.cosh,Mexp.math.acosh,Math.log,Math.pow,Math.sqrt,'4','5','6',Mexp.math.div,Mexp.math.fact,
-		Mexp.math.tanh,Mexp.math.atanh,Mexp.math.mod,'1','2','3',Mexp.math.mul,
-		Mexp.math.sinh,Mexp.math.asinh,'E',Mexp.math.log,'0','.',Mexp.math.add,Mexp.math.sub,',',Mexp.math.sigma,'n',Mexp.math.Pi,Math.pow];
-	var preced={0:11,1:0,2:3,3:0,4:0,5:0,6:0,7:11,8:11,9:1,10:10,11:0,12:11,13:0};
-	var type=[0,0,0,3,4,5,10,10,
-		0,0,0,1,1,1,0,
-		0,0,0,10,0,1,1,1,2,7,
-		0,0,2,1,1,1,2,
-		0,0,3,0,1,6,9,9,11,12,13,12,8];
-	 /*
-	0 : function with syntax function_name(Maths_exp)
-	1 : numbers
-	2 : binary operators like * / Mod left associate and same precedence
-	3 : Math constant values like e,pi,Cruncher ans
-	4 : opening bracket
-	5 : closing bracket
-	6 : decimal
-	7 : function with syntax (Math_exp)function_name
-	8: function with syntax function_name(Math_exp1,Math_exp2)
-	9 : binary operator like +,-
-	10: binary operator like P C or ^
-	11: ,
-	12: function with , seperated three parameters
-	13: variable of Sigma function
-	 */
-	var type0={0:true,1:true,3:true,4:true,6:true,8:true,9:true,12:true,13:true},//type2:true,type4:true,type9:true,type11:true,type21:true,type22
-	type1={0:true,1:true,2:true,3:true,4:true,5:true,6:true,7:true,8:true,9:true,10:true,11:true,12:true,13:true},//type3:true,type5:true,type7:true,type23
-	type_1={0:true,3:true,4:true,8:true,12:true,13:true},
-	empty={},
-	type_3={0:true,1:true,3:true,4:true,6:true,8:true,12:true,13:true},//type_5:true,type_7:true,type_23
-	type6={1:true},
-	newAr=[[],
-			["1","2","3","7","8","9","4","5","6","+","-","*","/","(",")","^","!","P","C","e","0",".",",","n"],
-			["pi","ln","Pi"],
-			["sin","cos","tan","Del","int","Mod","log","pow"],
-			["asin","acos","atan","cosh","root","tanh","sinh"],
-			["acosh","atanh","asinh","Sigma"]];
-	function match(str1,str2,i,x){
-		for(var f=0;f<x;f++){
-			if (str1[i+f]!==str2[f])
-				return false;
-		}
-		return true;
-	}
-	Mexp.addToken=function(tokens){
-		for(i=0;i<tokens.length;i++){
-			x=tokens[i].token.length;
-			var temp=-1;
+var Mexp = require('./math_function.js')
+function inc (arr, val) {
+  for (var i = 0; i < arr.length; i++) {
+    arr[i] += val
+  }
+  return arr
+}
+var token = ['sin', 'cos', 'tan', 'pi', '(', ')', 'P', 'C',
+  'asin', 'acos', 'atan', '7', '8', '9', 'int',
+  'cosh', 'acosh', 'ln', '^', 'root', '4', '5', '6', '/', '!',
+  'tanh', 'atanh', 'Mod', '1', '2', '3', '*',
+  'sinh', 'asinh', 'e', 'log', '0', '.', '+', '-', ',', 'Sigma', 'n', 'Pi', 'pow']
+var show = ['sin', 'cos', 'tan', '&pi;', '(', ')', 'P', 'C',
+  'asin', 'acos', 'atan', '7', '8', '9', 'Int',
+  'cosh', 'acosh', ' ln', '^', 'root', '4', '5', '6', '&divide;', '!',
+  'tanh', 'atanh', ' Mod ', '1', '2', '3', '&times;',
+  'sinh', 'asinh', 'e', ' log', '0', '.', '+', '-', ',', '&Sigma;', 'n', '&Pi;', 'pow']
+var eva = [Mexp.math.sin, Mexp.math.cos, Mexp.math.tan, 'PI', '(', ')', Mexp.math.P, Mexp.math.C,
+  Mexp.math.asin, Mexp.math.acos, Mexp.math.atan, '7', '8', '9', Math.floor,
+  Mexp.math.cosh, Mexp.math.acosh, Math.log, Math.pow, Math.sqrt, '4', '5', '6', Mexp.math.div, Mexp.math.fact,
+  Mexp.math.tanh, Mexp.math.atanh, Mexp.math.mod, '1', '2', '3', Mexp.math.mul,
+  Mexp.math.sinh, Mexp.math.asinh, 'E', Mexp.math.log, '0', '.', Mexp.math.add, Mexp.math.sub, ',', Mexp.math.sigma, 'n', Mexp.math.Pi, Math.pow]
+var preced = {
+  0: 11,
+  1: 0,
+  2: 3,
+  3: 0,
+  4: 0,
+  5: 0,
+  6: 0,
+  7: 11,
+  8: 11,
+  9: 1,
+  10: 10,
+  11: 0,
+  12: 11,
+  13: 0
+}
+var type = [0, 0, 0, 3, 4, 5, 10, 10,
+  0, 0, 0, 1, 1, 1, 0,
+  0, 0, 0, 10, 0, 1, 1, 1, 2, 7,
+  0, 0, 2, 1, 1, 1, 2,
+  0, 0, 3, 0, 1, 6, 9, 9, 11, 12, 13, 12, 8]
+/*
+0 : function with syntax function_name(Maths_exp)
+1 : numbers
+2 : binary operators like * / Mod left associate and same precedence
+3 : Math constant values like e,pi,Cruncher ans
+4 : opening bracket
+5 : closing bracket
+6 : decimal
+7 : function with syntax (Math_exp)function_name
+8: function with syntax function_name(Math_exp1,Math_exp2)
+9 : binary operator like +,-
+10: binary operator like P C or ^
+11: ,
+12: function with , seperated three parameters
+13: variable of Sigma function
+*/
+var type0 = {
+  0: true,
+  1: true,
+  3: true,
+  4: true,
+  6: true,
+  8: true,
+  9: true,
+  12: true,
+  13: true
+} // type2:true,type4:true,type9:true,type11:true,type21:true,type22
+var type1 = {
+  0: true,
+  1: true,
+  2: true,
+  3: true,
+  4: true,
+  5: true,
+  6: true,
+  7: true,
+  8: true,
+  9: true,
+  10: true,
+  11: true,
+  12: true,
+  13: true
+} // type3:true,type5:true,type7:true,type23
+var type1Asterick = {
+  0: true,
+  3: true,
+  4: true,
+  8: true,
+  12: true,
+  13: true
+}
+var empty = {}
+var type3Asterick = {
+  0: true,
+  1: true,
+  3: true,
+  4: true,
+  6: true,
+  8: true,
+  12: true,
+  13: true
+} // type_5:true,type_7:true,type_23
+var type6 = {
+  1: true
+}
+var newAr = [
+  [],
+  ['1', '2', '3', '7', '8', '9', '4', '5', '6', '+', '-', '*', '/', '(', ')', '^', '!', 'P', 'C', 'e', '0', '.', ',', 'n'],
+  ['pi', 'ln', 'Pi'],
+  ['sin', 'cos', 'tan', 'Del', 'int', 'Mod', 'log', 'pow'],
+  ['asin', 'acos', 'atan', 'cosh', 'root', 'tanh', 'sinh'],
+  ['acosh', 'atanh', 'asinh', 'Sigma']
+]
 
-			//newAr is a specially designed data structure in which 1D array at location one of 2d array has all string with length 1 2 with 2 and so on
+function match (str1, str2, i, x) {
+  for (var f = 0; f < x; f++) {
+    if (str1[i + f] !== str2[f]) {
+      return false
+    }
+  }
+  return true
+}
+Mexp.addToken = function (tokens) {
+  for (var i = 0; i < tokens.length; i++) {
+    var x = tokens[i].token.length
+    var temp = -1
 
-			if (x<newAr.length)	//match to check if token is really huge and not existing
-								//if not checked it will break in next line as undefined index
-				for(y=0;y<newAr[x].length;y++){
-					if (tokens[i].token===newAr[x][y]){
-						temp=token.indexOf(newAr[x][y]);
-						break;
-					}
-				}
-			if (temp===-1) {
-				token.push(tokens[i].token);
-				type.push(tokens[i].type);
-				if(newAr.length<=tokens[i].token.length)
-					newAr[tokens[i].token.length]=[];
-				newAr[tokens[i].token.length].push(tokens[i].token);
-				eva.push(tokens[i].value);
-				show.push(tokens[i].show);
-			}
-			else {
-				token[temp]=tokens[i].token;
-				type[temp]=tokens[i].type;
-				eva[temp]=tokens[i].value;
-				show[temp]=tokens[i].show;
-			}
-		}
-	};
-	Mexp.lex=function(inp,tokens){
-		'use strict';
-		var str=[{type:4,value:"(",show:"(",pre:0}];
-		var ptc=[];	//Parenthesis to close at the beginning is after one token
-		var inpStr=inp;
-		var key;
-        var pcounter=0;
-		var allowed=type0;
-		var bracToClose=0;
-		var asterick=empty;
-		var prevKey='';
-		var i,x,y;
-		if(typeof tokens!=="undefined")
-			Mexp.addToken(tokens);
-		var obj={};
-		for(i=0;i<inpStr.length;i++){
-			if (inpStr[i]==' ') {
-				continue;
-			}
-			key='';
-			sec:for(x=(inpStr.length-i>(newAr.length-2)?newAr.length-1:inpStr.length-i);x>0;x--){
-				for(y=0;y<newAr[x].length;y++){
-					if (match(inpStr,newAr[x][y],i,x)){
-						key=newAr[x][y];
-						break sec;
-					}
-				}
-			}
-			i+=key.length-1;
-			if(key===''){
-				throw(new Mexp.exception("Can't understand after "+inpStr.slice(i)));
-			}
-			var index=token.indexOf(key);
-			var cToken=key;
-			var cType=type[index];
-			var cEv=eva[index];
-			var cPre=preced[cType];
-			var	cShow=show[index];
-			var pre=str[str.length-1];
-			for(j=ptc.length;j--;){	//loop over ptc
-				if(ptc[j]===0){
-					if([0,2,3,5,9,11,12,13].indexOf(cType)!==-1){
-						if(allowed[cType]!==true){
-							throw(new Mexp.exception(key+" is not allowed after "+prevKey));
-						}
-						str.push({value:")",type:5,pre:0,show:")"});
-						allowed=type1;
-						asterick=type_3;
-						inc(ptc,-1).pop();
-					}
-				}
-			}
-			if(allowed[cType]!==true){
-				throw(new Mexp.exception(key+" is not allowed after "+prevKey));
-			}
-			if(asterick[cType]===true){
-				cType=2;
-				cEv=Mexp.math.mul;
-				cShow="&times;";
-				cPre=3;
-				i=i-key.length;
-		 	}
-			obj={value:cEv,type:cType,pre:cPre,show:cShow};
-			if(cType===0){
-				allowed=type0;
-				asterick=empty;
-				inc(ptc,2).push(2);
-				str.push(obj);
-				str.push({value:"(",type:4,pre:0,show:"("});
-			}
-			else if(cType===1){
-				if(pre.type===1){
-					pre.value+=cEv;
-					inc(ptc,1);
-				}
-				else {
-					str.push(obj);
-				}
-				allowed=type1;
-				asterick=type_1;
-			}
-			else if(cType===2){
-				allowed=type0;
-				asterick=empty;
-				inc(ptc,2);
-				str.push(obj);
-			}
-			else if(cType===3){//constant
-				str.push(obj);
-				allowed=type1;
-				asterick=type_3;
-			}
-			else if(cType===4){
-                pcounter+=ptc.length;
-                ptc=[];
-				bracToClose++;
-				allowed=type0;
-				asterick=empty;
-				str.push(obj);
-			}
-			else if(cType===5){
-				if(!bracToClose){
-					throw(new Mexp.exception("Closing parenthesis are more than opening one, wait What!!!"));
-				}
-                while(pcounter--){	//loop over ptc
-    						str.push({value:")",type:5,pre:0,show:")"});
-    			}
-                pcounter=0;
-				bracToClose--;
-				allowed=type1;
-				asterick=type_3;
-				str.push(obj);
-			}
-			else if(cType===6){
-				if(pre.hasDec){
-					throw(new Mexp.exception("Two decimals are not allowed in one number"));
-				}
-				if(pre.type!==1){
-					pre={value:0,type:1,pre:0};	//pre needs to be changed as it will the last value now to be safe in later code
-					str.push(pre);
-					inc(ptc,-1);
-				}
-				allowed=type6;
-				inc(ptc,1);
-				asterick=empty;
-				pre.value+=cEv;
-				pre.hasDec=true;
-			}
-			else if(cType===7){
-				allowed=type1;
-				asterick=type_3;
-				inc(ptc,1);
-				str.push(obj);
-			}
-			if(cType===8){
-				allowed=type0;
-				asterick=empty;
-				inc(ptc,4).push(4);
-				str.push(obj);
-				str.push({value:"(",type:4,pre:0,show:"("});
-			}
-			else if(cType===9){
-				if(pre.type===9){
-					if(pre.value===Mexp.math.add){
-						pre.value=cEv;
-						pre.show=cShow;
-						inc(ptc,1);
-					}
-					else if(pre.value===Mexp.math.sub&&cShow==='-'){
-						pre.value=Mexp.math.add;
-						pre.show='+';
-						inc(ptc,1);
-					}
-				}
-				else if(pre.type!==5&&pre.type!==7&&pre.type!==1&&pre.type!==3&&pre.type!==13){//changesign only when negative is found
-					if(cToken==='-'){//do nothing for + token
-									//don't add with the above if statement as that will run the else statement of parent if on Ctoken +
-						allowed=type0;
-						asterick=empty;
-						inc(ptc,2).push(2);
-						str.push({value:Mexp.math.changeSign,type:0,pre:21,show:"-"});
-						str.push({value:"(",type:4,pre:0,show:"("});
-					}
-				}
-				else{
-					str.push(obj);
-					inc(ptc,2);
-				}
-				allowed=type0;
-				asterick=empty;
-			}
-			else if(cType===10){
-				allowed=type0;
-				asterick=empty;
-				inc(ptc,2);
-				str.push(obj);
-			}
-			else if(cType===11){
-				allowed=type0;
-				asterick=empty;
-				str.push(obj);
-			}
-			else if(cType===12){
-				allowed=type0;
-				asterick=empty;
-				inc(ptc,6).push(6);
-				str.push(obj);
-				str.push({value:"(",type:4,pre:0});
-			}
-			else if(cType===13){
-				allowed=type1;
-				asterick=type_3;
-				str.push(obj);
-			}
-			inc(ptc,-1);
-			prevKey=key;
-		}
-		for(var j=ptc.length;j--;){	//loop over ptc
-			if(ptc[j]===0){
+    // newAr is a specially designed data structure in which 1D array at location one of 2d array has all string with length 1 2 with 2 and so on
 
-				str.push({value:")",show:")",type:5,pre:3});
-				inc(ptc,-1).pop();
-			}
-		}
-		if (allowed[5]!==true) {
-			throw(new Mexp.exception("complete the expression"));
-		}
-		while(bracToClose--)
-			str.push({value:")",show:")",type:5,pre:3});
+    if (x < newAr.length) { // match to check if token is really huge and not existing
+    // if not checked it will break in next line as undefined index
+      for (var y = 0; y < newAr[x].length; y++) {
+        if (tokens[i].token === newAr[x][y]) {
+          temp = token.indexOf(newAr[x][y])
+          break
+        }
+      }
+    }
+    if (temp === -1) {
+      token.push(tokens[i].token)
+      type.push(tokens[i].type)
+      if (newAr.length <= tokens[i].token.length) {
+        newAr[tokens[i].token.length] = []
+      }
+      newAr[tokens[i].token.length].push(tokens[i].token)
+      eva.push(tokens[i].value)
+      show.push(tokens[i].show)
+    } else {
+      token[temp] = tokens[i].token
+      type[temp] = tokens[i].type
+      eva[temp] = tokens[i].value
+      show[temp] = tokens[i].show
+    }
+  }
+}
+Mexp.lex = function (inp, tokens) {
+  'use strict'
+  var changeSignObj = {
+    value: Mexp.math.changeSign,
+    type: 0,
+    pre: 21,
+    show: '-'
+  }
+  var closingParObj = {
+    value: ')',
+    show: ')',
+    type: 5,
+    pre: 0
+  }
+  var openingParObj = {
+    value: '(',
+    type: 4,
+    pre: 0,
+    show: '('
+  }
+  var str = [openingParObj]
+  var ptc = [] // Parenthesis to close at the beginning is after one token
+  var inpStr = inp
+  var key
+  var pcounter = 0
+  var allowed = type0
+  var bracToClose = 0
+  var asterick = empty
+  var prevKey = ''
+  var i, x, y
+  if (typeof tokens !== 'undefined') {
+    Mexp.addToken(tokens)
+  }
+  var obj = {}
+  for (i = 0; i < inpStr.length; i++) {
+    if (inpStr[i] === ' ') {
+      continue
+    }
+    key = ''
+    for (x = (inpStr.length - i > (newAr.length - 2) ? newAr.length - 1 : inpStr.length - i); x > 0; x--) {
+      for (y = 0; y < newAr[x].length; y++) {
+        if (match(inpStr, newAr[x][y], i, x)) {
+          key = newAr[x][y]
+          y = newAr[x].length
+          x = 0
+        }
+      }
+    }
+    i += key.length - 1
+    if (key === '') {
+      throw (new Mexp.Exception('Can\'t understand after ' + inpStr.slice(i)))
+    }
+    var index = token.indexOf(key)
+    var cToken = key
+    var cType = type[index]
+    var cEv = eva[index]
+    var cPre = preced[cType]
+    var cShow = show[index]
+    var pre = str[str.length - 1]
+    var j
+    for (j = ptc.length; j--;) { // loop over ptc
+      if (ptc[j] === 0) {
+        if ([0, 2, 3, 5, 9, 11, 12, 13].indexOf(cType) !== -1) {
+          if (allowed[cType] !== true) {
+            throw (new Mexp.Exception(key + ' is not allowed after ' + prevKey))
+          }
+          str.push(closingParObj)
+          allowed = type1
+          asterick = type3Asterick
+          inc(ptc, -1).pop()
+        }
+      } else break
+    }
+    if (allowed[cType] !== true) {
+      throw (new Mexp.Exception(key + ' is not allowed after ' + prevKey))
+    }
+    if (asterick[cType] === true) {
+      cType = 2
+      cEv = Mexp.math.mul
+      cShow = '&times;'
+      cPre = 3
+      i = i - key.length
+    }
+    obj = {
+      value: cEv,
+      type: cType,
+      pre: cPre,
+      show: cShow
+    }
+    if (cType === 0) {
+      allowed = type0
+      asterick = empty
+      inc(ptc, 2).push(2)
+      str.push(obj)
+      str.push(openingParObj)
+    } else if (cType === 1) {
+      if (pre.type === 1) {
+        pre.value += cEv
+        inc(ptc, 1)
+      } else {
+        str.push(obj)
+      }
+      allowed = type1
+      asterick = type1Asterick
+    } else if (cType === 2) {
+      allowed = type0
+      asterick = empty
+      inc(ptc, 2)
+      str.push(obj)
+    } else if (cType === 3) { // constant
+      str.push(obj)
+      allowed = type1
+      asterick = type3Asterick
+    } else if (cType === 4) {
+      pcounter += ptc.length
+      ptc = []
+      bracToClose++
+      allowed = type0
+      asterick = empty
+      str.push(obj)
+    } else if (cType === 5) {
+      if (!bracToClose) {
+        throw (new Mexp.Exception('Closing parenthesis are more than opening one, wait What!!!'))
+      }
+      while (pcounter--) { // loop over ptc
+        str.push(closingParObj)
+      }
+      pcounter = 0
+      bracToClose--
+      allowed = type1
+      asterick = type3Asterick
+      str.push(obj)
+    } else if (cType === 6) {
+      if (pre.hasDec) {
+        throw (new Mexp.Exception('Two decimals are not allowed in one number'))
+      }
+      if (pre.type !== 1) {
+        pre = {
+          value: 0,
+          type: 1,
+          pre: 0
+        } // pre needs to be changed as it will the last value now to be safe in later code
+        str.push(pre)
+        inc(ptc, -1)
+      }
+      allowed = type6
+      inc(ptc, 1)
+      asterick = empty
+      pre.value += cEv
+      pre.hasDec = true
+    } else if (cType === 7) {
+      allowed = type1
+      asterick = type3Asterick
+      inc(ptc, 1)
+      str.push(obj)
+    }
+    if (cType === 8) {
+      allowed = type0
+      asterick = empty
+      inc(ptc, 4).push(4)
+      str.push(obj)
+      str.push(openingParObj)
+    } else if (cType === 9) {
+      if (pre.type === 9) {
+        if (pre.value === Mexp.math.add) {
+          pre.value = cEv
+          pre.show = cShow
+          inc(ptc, 1)
+        } else if (pre.value === Mexp.math.sub && cShow === '-') {
+          pre.value = Mexp.math.add
+          pre.show = '+'
+          inc(ptc, 1)
+        }
+      } else if (pre.type !== 5 && pre.type !== 7 && pre.type !== 1 && pre.type !== 3 && pre.type !== 13) { // changesign only when negative is found
+        if (cToken === '-') { // do nothing for + token
+          // don't add with the above if statement as that will run the else statement of parent if on Ctoken +
+          allowed = type0
+          asterick = empty
+          inc(ptc, 2).push(2)
+          str.push(changeSignObj)
+          str.push(openingParObj)
+        }
+      } else {
+        str.push(obj)
+        inc(ptc, 2)
+      }
+      allowed = type0
+      asterick = empty
+    } else if (cType === 10) {
+      allowed = type0
+      asterick = empty
+      inc(ptc, 2)
+      str.push(obj)
+    } else if (cType === 11) {
+      allowed = type0
+      asterick = empty
+      str.push(obj)
+    } else if (cType === 12) {
+      allowed = type0
+      asterick = empty
+      inc(ptc, 6).push(6)
+      str.push(obj)
+      str.push(openingParObj)
+    } else if (cType === 13) {
+      allowed = type1
+      asterick = type3Asterick
+      str.push(obj)
+    }
+    inc(ptc, -1)
+    prevKey = key
+  }
+  for (j = ptc.length; j--;) { // loop over ptc
+    if (ptc[j] === 0) {
+      str.push(closingParObj)
+      inc(ptc, -1).pop()
+    } else break  // if it is not zero so before ptc also cant be zero
+  }
+  if (allowed[5] !== true) {
+    throw (new Mexp.Exception('complete the expression'))
+  }
+  while (bracToClose--) {
+    str.push(closingParObj)
+  }
 
-		str.push({type:5,value:")",show:")",pre:0});
-//        console.log(str);
-		return new Mexp(str);
-	};
-    module.exports=Mexp;
+  str.push(closingParObj)
+  //        console.log(str);
+  return new Mexp(str)
+}
+module.exports = Mexp
 
 },{"./math_function.js":3}],3:[function(require,module,exports){
-	var Mexp=function(parsed){
-		this.value=parsed;
+var Mexp = function (parsed) {
+  this.value = parsed
+}
 
-	};
+Mexp.math = {
+  isDegree: true, // mode of calculator
+  acos: function (x) {
+    return (Mexp.math.isDegree ? 180 / Math.PI * Math.acos(x) : Math.acos(x))
+  },
+  add: function (a, b) {
+    return a + b
+  },
+  asin: function (x) {
+    return (Mexp.math.isDegree ? 180 / Math.PI * Math.asin(x) : Math.asin(x))
+  },
+  atan: function (x) {
+    return (Mexp.math.isDegree ? 180 / Math.PI * Math.atan(x) : Math.atan(x))
+  },
+  acosh: function (x) {
+    return Math.log(x + Math.sqrt(x * x - 1))
+  },
+  asinh: function (x) {
+    return Math.log(x + Math.sqrt(x * x + 1))
+  },
+  atanh: function (x) {
+    return Math.log((1 + x) / (1 - x))
+  },
+  C: function (n, r) {
+    var pro = 1
+    var other = n - r
+    var choice = r
+    if (choice < other) {
+      choice = other
+      other = r
+    }
+    for (var i = choice + 1; i <= n; i++) {
+      pro *= i
+    }
+    return pro / Mexp.math.fact(other)
+  },
+  changeSign: function (x) {
+    return -x
+  },
+  cos: function (x) {
+    if (Mexp.math.isDegree) x = Mexp.math.toRadian(x)
+    return Math.cos(x)
+  },
+  cosh: function (x) {
+    return (Math.pow(Math.E, x) + Math.pow(Math.E, -1 * x)) / 2
+  },
+  div: function (a, b) {
+    return a / b
+  },
+  fact: function (n) {
+    if (n % 1 !== 0) return 'NaN'
+    var pro = 1
+    for (var i = 2; i <= n; i++) {
+      pro *= i
+    }
+    return pro
+  },
+  inverse: function (x) {
+    return 1 / x
+  },
+  log: function (i) {
+    return Math.log(i) / Math.log(10)
+  },
+  mod: function (a, b) {
+    return a % b
+  },
+  mul: function (a, b) {
+    return a * b
+  },
+  P: function (n, r) {
+    var pro = 1
+    for (var i = Math.floor(n) - Math.floor(r) + 1; i <= Math.floor(n); i++) {
+      pro *= i
+    }
+    return pro
+  },
+  Pi: function (low, high, ex) {
+    var pro = 1
+    for (var i = low; i <= high; i++) {
+      pro *= Number(ex.postfixEval({
+        n: i
+      }))
+    }
+    return pro
+  },
+  pow10x: function (e) {
+    var x = 1
+    while (e--) {
+      x *= 10
+    }
+    return x
+  },
+  sigma: function (low, high, ex) {
+    var sum = 0
+    for (var i = low; i <= high; i++) {
+      sum += Number(ex.postfixEval({
+        n: i
+      }))
+    }
+    return sum
+  },
+  sin: function (x) {
+    if (Mexp.math.isDegree) x = Mexp.math.toRadian(x)
+    return Math.sin(x)
+  },
+  sinh: function (x) {
+    return (Math.pow(Math.E, x) - Math.pow(Math.E, -1 * x)) / 2
+  },
+  sub: function (a, b) {
+    return a - b
+  },
+  tan: function (x) {
+    if (Mexp.math.isDegree) x = Mexp.math.toRadian(x)
+    return Math.tan(x)
+  },
+  tanh: function (x) {
+    return Mexp.sinha(x) / Mexp.cosha(x)
+  },
+  toRadian: function (x) {
+    return x * Math.PI / 180
+  }
+}
+Mexp.Exception = function (message) {
+  this.message = message
+}
+module.exports = Mexp
 
-	Mexp.math={
-		isDegree:true, //mode of calculator
-		acos:function(x){
-			return (Mexp.math.isDegree?180/Math.PI*Math.acos(x):Math.acos(x));
-		},
-		add:function(a,b){
-			return a+b;
-		},
-		asin:function(x){
-			return (Mexp.math.isDegree?180/Math.PI*Math.asin(x):Math.asin(x));
-		},
-		atan:function(x){
-			return (Mexp.math.isDegree?180/Math.PI*Math.atan(x):Math.atan(x));
-		},
-		acosh:function(x){
-			return Math.log(x+Math.sqrt(x*x-1));
-		},
-		asinh:function(x){
-			return Math.log(x+Math.sqrt(x*x+1));
-		},
-		atanh:function(x){
-			return Math.log((1+x)/(1-x));
-		},
-		C:function(n,r){
-			var pro=1,other=n-r,choice=r;
-			if(choice<other){
-			choice=other;
-			other=r;
-			}
-			for(var i=choice+1;i<=n;i++)
-				pro*=i;
-			return pro/Mexp.math.fact(other);
-		},
-		changeSign:function(x){
-			return -x;
-		},
-		cos:function(x){
-			if(Mexp.math.isDegree)x=Mexp.math.toRadian(x);
-			return Math.cos(x);
-		},
-		cosh:function(x){
-			return (Math.pow(Math.E,x)+Math.pow(Math.E,-1*x))/2;
-		},
-		div:function(a,b){
-		return a/b;
-		},
-		fact:function(n) {
-		if(n%1!==0)return "NAN";
-			var pro=1;
-			for(var i=2;i<=n;i++)
-				pro*=i;
-			return pro;
-		},
-		inverse:function(x){
-			return 1/x;
-		},
-		log:function(i){
-			return Math.log(i)/Math.log(10);
-		},
-		mod:function(a,b){
-		return a%b;
-		},
-		mul:function(a,b){
-		return a*b;
-		},
-		P:function(n,r){var pro=1;
-			 for(var i=Math.floor(n)-Math.floor(r)+1;i<=Math.floor(n);i++)
-					pro*=i;
-					return pro;
-
-		},
-		Pi:function(low,high,ex){
-			var pro=1;
-			for(var i=low;i<=high;i++){
-				pro*=Number(ex.postfixEval({n:i}));
-			}
-			return pro;
-		},
-		pow10x:function(e){
-			var x=1;
-			while(e--){x*=10;}
-			return x;
-		},
-		sigma:function(low,high,ex){
-			var sum=0;
-			for(var i=low;i<=high;i++){
-				sum+=Number(ex.postfixEval({n:i}));
-			}
-			return sum;
-		},
-		sin:function(x){
-			if(Mexp.math.isDegree)x=Mexp.math.toRadian(x);
-			return Math.sin(x);
-		},
-		sinh:function(x){
-			return (Math.pow(Math.E,x)-Math.pow(Math.E,-1*x))/2;
-		},
-		sub:function(a,b){
-		return a-b;
-		},
-		tan:function(x){
-			if(Mexp.math.isDegree)x=Mexp.math.toRadian(x);
-			return Math.tan(x);
-		},
-		tanh:function(x){
-			return Mexp.sinha(x)/Mexp.cosha(x);
-		},
-		toRadian:function(x){
-			return x*Math.PI/180;
-		}
-	};
-	Mexp.exception=function(message){
-		this.message=message;
-	};
-    module.exports=Mexp;
 },{}],4:[function(require,module,exports){
@@ -480,0 +569,0 @@

dist/browser/math-expression-evaluator.min.js

@@ -25,3 +25,3 @@ /*
 /** math-expression-evaluator version 1.2.17
- Dated:2017-04-28 */
-!function(a){if("object"==typeof exports&&"undefined"!=typeof module)module.exports=a();else if("function"==typeof define&&define.amd)define([],a);else{var b;b="undefined"!=typeof window?window:"undefined"!=typeof global?global:"undefined"!=typeof self?self:this,b.mexp=a()}}(function(){return function a(b,c,d){function e(g,h){if(!c[g]){if(!b[g]){var i="function"==typeof require&&require;if(!h&&i)return i(g,!0);if(f)return f(g,!0);var j=new Error("Cannot find module '"+g+"'");throw j.code="MODULE_NOT_FOUND",j}var k=c[g]={exports:{}};b[g][0].call(k.exports,function(a){var c=b[g][1][a];return e(c?c:a)},k,k.exports,a,b,c,d)}return c[g].exports}for(var f="function"==typeof require&&require,g=0;g<d.length;g++)e(d[g]);return e}({1:[function(a,b,c){var d=a("./postfix_evaluator.js");d.prototype.formulaEval=function(){"use strict";for(var a,b,c,d=[],e=this.value,f=0;f<e.length;f++)1===e[f].type||3===e[f].type?d.push({value:3===e[f].type?e[f].show:e[f].value,type:1}):13===e[f].type?d.push({value:e[f].show,type:1}):0===e[f].type?d[d.length-1]={value:e[f].show+("-"!=e[f].show?"(":"")+d[d.length-1].value+("-"!=e[f].show?")":""),type:0}:7===e[f].type?d[d.length-1]={value:(1!=d[d.length-1].type?"(":"")+d[d.length-1].value+(1!=d[d.length-1].type?")":"")+e[f].show,type:7}:10===e[f].type?(a=d.pop(),b=d.pop(),"P"===e[f].show||"C"===e[f].show?d.push({value:"<sup>"+b.value+"</sup>"+e[f].show+"<sub>"+a.value+"</sub>",type:10}):d.push({value:(1!=b.type?"(":"")+b.value+(1!=b.type?")":"")+"<sup>"+a.value+"</sup>",type:1})):2===e[f].type||9===e[f].type?(a=d.pop(),b=d.pop(),d.push({value:(1!=b.type?"(":"")+b.value+(1!=b.type?")":"")+e[f].show+(1!=a.type?"(":"")+a.value+(1!=a.type?")":""),type:e[f].type})):12===e[f].type&&(a=d.pop(),b=d.pop(),c=d.pop(),d.push({value:e[f].show+"("+c.value+","+b.value+","+a.value+")",type:12}));return d[0].value},b.exports=d},{"./postfix_evaluator.js":5}],2:[function(a,b,c){function d(a,b){for(var c=0;c<a.length;c++)a[c]+=b;return a}function e(a,b,c,d){for(var e=0;e<d;e++)if(a[c+e]!==b[e])return!1;return!0}var f=a("./math_function.js"),g=["sin","cos","tan","pi","(",")","P","C","asin","acos","atan","7","8","9","int","cosh","acosh","ln","^","root","4","5","6","/","!","tanh","atanh","Mod","1","2","3","*","sinh","asinh","e","log","0",".","+","-",",","Sigma","n","Pi","pow"],h=["sin","cos","tan","&pi;","(",")","P","C","asin","acos","atan","7","8","9","Int","cosh","acosh"," ln","^","root","4","5","6","&divide;","!","tanh","atanh"," Mod ","1","2","3","&times;","sinh","asinh","e"," 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b=-1;if(x<s.length)for(y=0;y<s[x].length;y++)if(a[i].token===s[x][y]){b=g.indexOf(s[x][y]);break}b===-1?(g.push(a[i].token),l.push(a[i].type),s.length<=a[i].token.length&&(s[a[i].token.length]=[]),s[a[i].token.length].push(a[i].token),j.push(a[i].value),h.push(a[i].show)):(g[b]=a[i].token,l[b]=a[i].type,j[b]=a[i].value,h[b]=a[i].show)}},f.lex=function(a,b){"use strict";var c,i,t,u,v=[{type:4,value:"(",show:"(",pre:0}],w=[],x=a,y=0,z=m,A=0,B=p,C="";"undefined"!=typeof b&&f.addToken(b);var D={};for(i=0;i<x.length;i++)if(" "!=x[i]){c="";a:for(t=x.length-i>s.length-2?s.length-1:x.length-i;t>0;t--)for(u=0;u<s[t].length;u++)if(e(x,s[t][u],i,t)){c=s[t][u];break a}if(i+=c.length-1,""===c)throw new f.exception("Can't understand after "+x.slice(i));var E=g.indexOf(c),F=c,G=l[E],H=j[E],I=k[G],J=h[E],K=v[v.length-1];for(L=w.length;L--;)if(0===w[L]&&[0,2,3,5,9,11,12,13].indexOf(G)!==-1){if(z[G]!==!0)throw new f.exception(c+" is not allowed after 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+ Dated:2017-05-05 */
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d=1,e=a;e<=b;e++)d*=Number(c.postfixEval({n:e}));return d},pow10x:function(a){for(var b=1;a--;)b*=10;return b},sigma:function(a,b,c){for(var d=0,e=a;e<=b;e++)d+=Number(c.postfixEval({n:e}));return d},sin:function(a){return d.math.isDegree&&(a=d.math.toRadian(a)),Math.sin(a)},sinh:function(a){return(Math.pow(Math.E,a)-Math.pow(Math.E,-1*a))/2},sub:function(a,b){return a-b},tan:function(a){return d.math.isDegree&&(a=d.math.toRadian(a)),Math.tan(a)},tanh:function(a){return d.sinha(a)/d.cosha(a)},toRadian:function(a){return a*Math.PI/180}},d.Exception=function(a){this.message=a},b.exports=d},{}],4:[function(a,b,c){var d=a("./lexer.js");d.prototype.toPostfix=function(){"use strict";for(var a,b,c,e,f,g=[],h=[{value:"(",type:4,pre:0}],i=this.value,j=1;j<i.length;j++)if(1===i[j].type||3===i[j].type||13===i[j].type)1===i[j].type&&(i[j].value=Number(i[j].value)),g.push(i[j]);else if(4===i[j].type)h.push(i[j]);else if(5===i[j].type)for(;4!==(b=h.pop()).type;)g.push(b);else if(11===i[j].type){for(;4!==(b=h.pop()).type;)g.push(b);h.push(b)}else{a=i[j],e=a.pre,f=h[h.length-1],c=f.pre;var k="Math.pow"==f.value&&"Math.pow"==a.value;if(e>c)h.push(a);else{for(;c>=e&&!k||k&&e<c;)b=h.pop(),f=h[h.length-1],g.push(b),c=f.pre,k="Math.pow"==a.value&&"Math.pow"==f.value;h.push(a)}}return new d(g)},b.exports=d},{"./lexer.js":2}],5:[function(a,b,c){var d=a("./postfix.js");d.prototype.postfixEval=function(a){"use strict";a=a||{},a.PI=Math.PI,a.E=Math.E;for(var b,c,e,f=[],g=this.value,h="undefined"!=typeof a.n,i=0;i<g.length;i++)1===g[i].type?f.push({value:g[i].value,type:1}):3===g[i].type?f.push({value:a[g[i].value],type:1}):0===g[i].type?"undefined"==typeof f[f.length-1].type?f[f.length-1].value.push(g[i]):f[f.length-1].value=g[i].value(f[f.length-1].value):7===g[i].type?"undefined"==typeof f[f.length-1].type?f[f.length-1].value.push(g[i]):f[f.length-1].value=g[i].value(f[f.length-1].value):8===g[i].type?(b=f.pop(),c=f.pop(),f.push({type:1,value:g[i].value(c.value,b.value)})):10===g[i].type?(b=f.pop(),c=f.pop(),"undefined"==typeof c.type?(c.value=c.concat(b),c.value.push(g[i]),f.push(c)):"undefined"==typeof b.type?(b.unshift(c),b.push(g[i]),f.push(b)):f.push({type:1,value:g[i].value(c.value,b.value)})):2===g[i].type||9===g[i].type?(b=f.pop(),c=f.pop(),"undefined"==typeof c.type?(console.log(c),c=c.concat(b),c.push(g[i]),f.push(c)):"undefined"==typeof b.type?(b.unshift(c),b.push(g[i]),f.push(b)):f.push({type:1,value:g[i].value(c.value,b.value)})):12===g[i].type?(b=f.pop(),"undefined"!=typeof b.type&&(b=[b]),c=f.pop(),e=f.pop(),f.push({type:1,value:g[i].value(e.value,c.value,new d(b))})):13===g[i].type&&(h?f.push({value:a[g[i].value],type:3}):f.push([g[i]]));if(f.length>1)throw new d.exception("Uncaught Syntax error");return f[0].value>1e15?"Infinity":parseFloat(f[0].value.toFixed(15))},d.eval=function(a,b,c){return"undefined"==typeof b?this.lex(a).toPostfix().postfixEval():"undefined"==typeof c?"undefined"!=typeof b.length?this.lex(a,b).toPostfix().postfixEval():this.lex(a).toPostfix().postfixEval(b):this.lex(a,b).toPostfix().postfixEval(c)},b.exports=d},{"./postfix.js":4}]},{},[1])(1)});

package.json

 {
   "name": "math-expression-evaluator",
-  "version": "1.2.17",
+  "version": "1.2.18",
   "description": "A flexible math expression evaluator",
@@ -11,3 +11,3 @@ "main": "src/formula_evaluator.js",
     "type": "git",
-    "url": "git+https://github.com/redhivesoftware/math-expression-evaluator#readme"
+    "url": "https://github.com/redhivesoftware/math-expression-evaluator.git"
   },
@@ -27,8 +27,15 @@ "keywords": [
   "devDependencies": {
+    "eslint": "^6.6.0",
+    "eslint-config-standard": "^10.2.1",
+    "eslint-plugin-import": "^2.2.0",
+    "eslint-plugin-node": "^4.2.2",
+    "eslint-plugin-promise": "^3.5.0",
+    "eslint-plugin-standard": "^3.0.1",
     "grunt": "^0.4.5",
     "grunt-browserify": "^3.8.0",
-    "grunt-contrib-jshint": "^0.11.2",
     "grunt-contrib-uglify": "^0.9.1",
+    "grunt-contrib-watch": "^1.0.0",
+    "grunt-eslint": "^19.0.0",
     "mocha": "^2.2.5"
   }
 }

README.md

@@ -1,3 +0,1 @@
-
-
 # math-expression-evaluator
@@ -23,3 +21,3 @@ An extremely efficient, flexible and amazing evaluator for Math expression in Javascript.([Documentation](http://redhivesoftware.github.io/math-expression-evaluator/))
 ### Node JS
- **Using npm** 
+ **Using npm**
 
@@ -60,20 +58,20 @@ npm install math-expression-evaluator
 |**^**| power operator eg. 2^3 returns 8 |
-|**root**| underroot function root 4 returns 2 | 
+|**root**| underroot function root 4 returns 2 |
 |**sin**| Sine function |
 |**cos**| Cosine function |
 |**tan**| Tangent function |
-|**asin**| Inverse Sine funtion |
-|**acos**| Inverse Cosine funtion |
-|**atan**| Inverse Tangent funtion |
-|**sinh**| Hyperbolic Sine funtion |
-|**cosh**| Hyperbolic Cosine funtion |
-|**tanh**| Hyperbolic Tangent funtion |
-|**asinh**| Inverse Hyperbolic Sine funtion |
-|**acosh**| Inverse Hyperbolic Cosine funtion |
-|**atanh**| Inverse Hyperbolic Tangent funtion |
+|**asin**| Inverse Sine function |
+|**acos**| Inverse Cosine function |
+|**atan**| Inverse Tangent function |
+|**sinh**| Hyperbolic Sine function |
+|**cosh**| Hyperbolic Cosine function |
+|**tanh**| Hyperbolic Tangent function |
+|**asinh**| Inverse Hyperbolic Sine function |
+|**acosh**| Inverse Hyperbolic Cosine function |
+|**atanh**| Inverse Hyperbolic Tangent function |
 
-## Features  
+## Features
 
-### Amazing support for Sigma and Pi  
-This is a fantastic feature of this calculator that it is capable of evaluating expressions containing **Sigma and Pi**.  
+### Amazing support for Sigma and Pi
+This is a fantastic feature of this calculator that it is capable of evaluating expressions containing **Sigma and Pi**.
 Passing `Sigma(1,100,n)` will evaluate to 5050 as n is summationed from 1 to 100.
@@ -86,6 +84,5 @@ and Pi(1,15,n) will evaluate to 1307674368000 as n is multiplied from 1 to 15 which is equal to 15!
 
-
 ##Changelog
 
-### Removed lodash.indexof and used native Array.prototype.indexOf hence dropping suppports for IE8 and below. 
+### Removed lodash.indexof and used native Array.prototype.indexOf hence dropping suppports for IE8 and below.
 This will reflect in next release named v1.2.16

src/lexer.js

@@ -1,309 +0,382 @@
-var Mexp=require('./math_function.js');
-	function inc(arr,val){
-		for(var i=0;i<arr.length;i++)
-			arr[i]+=val;
-		return arr;
-	}
-	var token=['sin','cos','tan','pi','(',')','P','C',
-		  'asin','acos','atan','7','8','9','int',
-		  'cosh','acosh','ln','^','root','4','5','6','/','!',
-		  'tanh','atanh','Mod','1','2','3','*',
-		  'sinh','asinh','e','log','0','.','+','-',',','Sigma','n','Pi','pow'];
-	var show=['sin','cos','tan','&pi;','(',')','P','C',
-		'asin','acos','atan','7','8','9','Int',
-		'cosh','acosh',' ln','^','root','4','5','6','&divide;','!',
-		'tanh','atanh',' Mod ','1','2','3','&times;',
-		'sinh','asinh','e',' log','0','.','+','-',',','&Sigma;','n','&Pi;','pow'];
-	var eva=[Mexp.math.sin,Mexp.math.cos,Mexp.math.tan,'PI','(',')',Mexp.math.P,Mexp.math.C,
-		Mexp.math.asin,Mexp.math.acos,Mexp.math.atan,'7','8','9',Math.floor,
-		Mexp.math.cosh,Mexp.math.acosh,Math.log,Math.pow,Math.sqrt,'4','5','6',Mexp.math.div,Mexp.math.fact,
-		Mexp.math.tanh,Mexp.math.atanh,Mexp.math.mod,'1','2','3',Mexp.math.mul,
-		Mexp.math.sinh,Mexp.math.asinh,'E',Mexp.math.log,'0','.',Mexp.math.add,Mexp.math.sub,',',Mexp.math.sigma,'n',Mexp.math.Pi,Math.pow];
-	var preced={0:11,1:0,2:3,3:0,4:0,5:0,6:0,7:11,8:11,9:1,10:10,11:0,12:11,13:0};
-	var type=[0,0,0,3,4,5,10,10,
-		0,0,0,1,1,1,0,
-		0,0,0,10,0,1,1,1,2,7,
-		0,0,2,1,1,1,2,
-		0,0,3,0,1,6,9,9,11,12,13,12,8];
-	 /*
-	0 : function with syntax function_name(Maths_exp)
-	1 : numbers
-	2 : binary operators like * / Mod left associate and same precedence
-	3 : Math constant values like e,pi,Cruncher ans
-	4 : opening bracket
-	5 : closing bracket
-	6 : decimal
-	7 : function with syntax (Math_exp)function_name
-	8: function with syntax function_name(Math_exp1,Math_exp2)
-	9 : binary operator like +,-
-	10: binary operator like P C or ^
-	11: ,
-	12: function with , seperated three parameters
-	13: variable of Sigma function
-	 */
-	var type0={0:true,1:true,3:true,4:true,6:true,8:true,9:true,12:true,13:true},//type2:true,type4:true,type9:true,type11:true,type21:true,type22
-	type1={0:true,1:true,2:true,3:true,4:true,5:true,6:true,7:true,8:true,9:true,10:true,11:true,12:true,13:true},//type3:true,type5:true,type7:true,type23
-	type_1={0:true,3:true,4:true,8:true,12:true,13:true},
-	empty={},
-	type_3={0:true,1:true,3:true,4:true,6:true,8:true,12:true,13:true},//type_5:true,type_7:true,type_23
-	type6={1:true},
-	newAr=[[],
-			["1","2","3","7","8","9","4","5","6","+","-","*","/","(",")","^","!","P","C","e","0",".",",","n"],
-			["pi","ln","Pi"],
-			["sin","cos","tan","Del","int","Mod","log","pow"],
-			["asin","acos","atan","cosh","root","tanh","sinh"],
-			["acosh","atanh","asinh","Sigma"]];
-	function match(str1,str2,i,x){
-		for(var f=0;f<x;f++){
-			if (str1[i+f]!==str2[f])
-				return false;
-		}
-		return true;
-	}
-	Mexp.addToken=function(tokens){
-		for(i=0;i<tokens.length;i++){
-			x=tokens[i].token.length;
-			var temp=-1;
+var Mexp = require('./math_function.js')
+function inc (arr, val) {
+  for (var i = 0; i < arr.length; i++) {
+    arr[i] += val
+  }
+  return arr
+}
+var token = ['sin', 'cos', 'tan', 'pi', '(', ')', 'P', 'C',
+  'asin', 'acos', 'atan', '7', '8', '9', 'int',
+  'cosh', 'acosh', 'ln', '^', 'root', '4', '5', '6', '/', '!',
+  'tanh', 'atanh', 'Mod', '1', '2', '3', '*',
+  'sinh', 'asinh', 'e', 'log', '0', '.', '+', '-', ',', 'Sigma', 'n', 'Pi', 'pow']
+var show = ['sin', 'cos', 'tan', '&pi;', '(', ')', 'P', 'C',
+  'asin', 'acos', 'atan', '7', '8', '9', 'Int',
+  'cosh', 'acosh', ' ln', '^', 'root', '4', '5', '6', '&divide;', '!',
+  'tanh', 'atanh', ' Mod ', '1', '2', '3', '&times;',
+  'sinh', 'asinh', 'e', ' log', '0', '.', '+', '-', ',', '&Sigma;', 'n', '&Pi;', 'pow']
+var eva = [Mexp.math.sin, Mexp.math.cos, Mexp.math.tan, 'PI', '(', ')', Mexp.math.P, Mexp.math.C,
+  Mexp.math.asin, Mexp.math.acos, Mexp.math.atan, '7', '8', '9', Math.floor,
+  Mexp.math.cosh, Mexp.math.acosh, Math.log, Math.pow, Math.sqrt, '4', '5', '6', Mexp.math.div, Mexp.math.fact,
+  Mexp.math.tanh, Mexp.math.atanh, Mexp.math.mod, '1', '2', '3', Mexp.math.mul,
+  Mexp.math.sinh, Mexp.math.asinh, 'E', Mexp.math.log, '0', '.', Mexp.math.add, Mexp.math.sub, ',', Mexp.math.sigma, 'n', Mexp.math.Pi, Math.pow]
+var preced = {
+  0: 11,
+  1: 0,
+  2: 3,
+  3: 0,
+  4: 0,
+  5: 0,
+  6: 0,
+  7: 11,
+  8: 11,
+  9: 1,
+  10: 10,
+  11: 0,
+  12: 11,
+  13: 0
+} // stores precedence by types
+var type = [0, 0, 0, 3, 4, 5, 10, 10,
+  0, 0, 0, 1, 1, 1, 0,
+  0, 0, 0, 10, 0, 1, 1, 1, 2, 7,
+  0, 0, 2, 1, 1, 1, 2,
+  0, 0, 3, 0, 1, 6, 9, 9, 11, 12, 13, 12, 8]
+/*
+0 : function with syntax function_name(Maths_exp)
+1 : numbers
+2 : binary operators like * / Mod left associate and same precedence
+3 : Math constant values like e,pi,Cruncher ans
+4 : opening bracket
+5 : closing bracket
+6 : decimal
+7 : function with syntax (Math_exp)function_name
+8: function with syntax function_name(Math_exp1,Math_exp2)
+9 : binary operator like +,-
+10: binary operator like P C or ^
+11: ,
+12: function with , seperated three parameters
+13: variable of Sigma function
+*/
+var type0 = {
+  0: true,
+  1: true,
+  3: true,
+  4: true,
+  6: true,
+  8: true,
+  9: true,
+  12: true,
+  13: true
+} // type2:true,type4:true,type9:true,type11:true,type21:true,type22
+var type1 = {
+  0: true,
+  1: true,
+  2: true,
+  3: true,
+  4: true,
+  5: true,
+  6: true,
+  7: true,
+  8: true,
+  9: true,
+  10: true,
+  11: true,
+  12: true,
+  13: true
+} // type3:true,type5:true,type7:true,type23
+var type1Asterick = {
+  0: true,
+  3: true,
+  4: true,
+  8: true,
+  12: true,
+  13: true
+}
+var empty = {}
+var type3Asterick = {
+  0: true,
+  1: true,
+  3: true,
+  4: true,
+  6: true,
+  8: true,
+  12: true,
+  13: true
+} // type_5:true,type_7:true,type_23
+var type6 = {
+  1: true
+}
+var newAr = [
+  [],
+  ['1', '2', '3', '7', '8', '9', '4', '5', '6', '+', '-', '*', '/', '(', ')', '^', '!', 'P', 'C', 'e', '0', '.', ',', 'n'],
+  ['pi', 'ln', 'Pi'],
+  ['sin', 'cos', 'tan', 'Del', 'int', 'Mod', 'log', 'pow'],
+  ['asin', 'acos', 'atan', 'cosh', 'root', 'tanh', 'sinh'],
+  ['acosh', 'atanh', 'asinh', 'Sigma']
+]
 
-			//newAr is a specially designed data structure in which 1D array at location one of 2d array has all string with length 1 2 with 2 and so on
+function match (str1, str2, i, x) {
+  for (var f = 0; f < x; f++) {
+    if (str1[i + f] !== str2[f]) {
+      return false
+    }
+  }
+  return true
+}
+Mexp.addToken = function (tokens) {
+  for (var i = 0; i < tokens.length; i++) {
+    var x = tokens[i].token.length
+    var temp = -1
 
-			if (x<newAr.length)	//match to check if token is really huge and not existing
-								//if not checked it will break in next line as undefined index
-				for(y=0;y<newAr[x].length;y++){
-					if (tokens[i].token===newAr[x][y]){
-						temp=token.indexOf(newAr[x][y]);
-						break;
-					}
-				}
-			if (temp===-1) {
-				token.push(tokens[i].token);
-				type.push(tokens[i].type);
-				if(newAr.length<=tokens[i].token.length)
-					newAr[tokens[i].token.length]=[];
-				newAr[tokens[i].token.length].push(tokens[i].token);
-				eva.push(tokens[i].value);
-				show.push(tokens[i].show);
-			}
-			else {
-				token[temp]=tokens[i].token;
-				type[temp]=tokens[i].type;
-				eva[temp]=tokens[i].value;
-				show[temp]=tokens[i].show;
-			}
-		}
-	};
-	Mexp.lex=function(inp,tokens){
-		'use strict';
-		var str=[{type:4,value:"(",show:"(",pre:0}];
-		var ptc=[];	//Parenthesis to close at the beginning is after one token
-		var inpStr=inp;
-		var key;
-        var pcounter=0;
-		var allowed=type0;
-		var bracToClose=0;
-		var asterick=empty;
-		var prevKey='';
-		var i,x,y;
-		if(typeof tokens!=="undefined")
-			Mexp.addToken(tokens);
-		var obj={};
-		for(i=0;i<inpStr.length;i++){
-			if (inpStr[i]==' ') {
-				continue;
-			}
-			key='';
-			sec:for(x=(inpStr.length-i>(newAr.length-2)?newAr.length-1:inpStr.length-i);x>0;x--){
-				for(y=0;y<newAr[x].length;y++){
-					if (match(inpStr,newAr[x][y],i,x)){
-						key=newAr[x][y];
-						break sec;
-					}
-				}
-			}
-			i+=key.length-1;
-			if(key===''){
-				throw(new Mexp.exception("Can't understand after "+inpStr.slice(i)));
-			}
-			var index=token.indexOf(key);
-			var cToken=key;
-			var cType=type[index];
-			var cEv=eva[index];
-			var cPre=preced[cType];
-			var	cShow=show[index];
-			var pre=str[str.length-1];
-			for(j=ptc.length;j--;){	//loop over ptc
-				if(ptc[j]===0){
-					if([0,2,3,5,9,11,12,13].indexOf(cType)!==-1){
-						if(allowed[cType]!==true){
-							throw(new Mexp.exception(key+" is not allowed after "+prevKey));
-						}
-						str.push({value:")",type:5,pre:0,show:")"});
-						allowed=type1;
-						asterick=type_3;
-						inc(ptc,-1).pop();
-					}
-				}
-			}
-			if(allowed[cType]!==true){
-				throw(new Mexp.exception(key+" is not allowed after "+prevKey));
-			}
-			if(asterick[cType]===true){
-				cType=2;
-				cEv=Mexp.math.mul;
-				cShow="&times;";
-				cPre=3;
-				i=i-key.length;
-		 	}
-			obj={value:cEv,type:cType,pre:cPre,show:cShow};
-			if(cType===0){
-				allowed=type0;
-				asterick=empty;
-				inc(ptc,2).push(2);
-				str.push(obj);
-				str.push({value:"(",type:4,pre:0,show:"("});
-			}
-			else if(cType===1){
-				if(pre.type===1){
-					pre.value+=cEv;
-					inc(ptc,1);
-				}
-				else {
-					str.push(obj);
-				}
-				allowed=type1;
-				asterick=type_1;
-			}
-			else if(cType===2){
-				allowed=type0;
-				asterick=empty;
-				inc(ptc,2);
-				str.push(obj);
-			}
-			else if(cType===3){//constant
-				str.push(obj);
-				allowed=type1;
-				asterick=type_3;
-			}
-			else if(cType===4){
-                pcounter+=ptc.length;
-                ptc=[];
-				bracToClose++;
-				allowed=type0;
-				asterick=empty;
-				str.push(obj);
-			}
-			else if(cType===5){
-				if(!bracToClose){
-					throw(new Mexp.exception("Closing parenthesis are more than opening one, wait What!!!"));
-				}
-                while(pcounter--){	//loop over ptc
-    						str.push({value:")",type:5,pre:0,show:")"});
-    			}
-                pcounter=0;
-				bracToClose--;
-				allowed=type1;
-				asterick=type_3;
-				str.push(obj);
-			}
-			else if(cType===6){
-				if(pre.hasDec){
-					throw(new Mexp.exception("Two decimals are not allowed in one number"));
-				}
-				if(pre.type!==1){
-					pre={value:0,type:1,pre:0};	//pre needs to be changed as it will the last value now to be safe in later code
-					str.push(pre);
-					inc(ptc,-1);
-				}
-				allowed=type6;
-				inc(ptc,1);
-				asterick=empty;
-				pre.value+=cEv;
-				pre.hasDec=true;
-			}
-			else if(cType===7){
-				allowed=type1;
-				asterick=type_3;
-				inc(ptc,1);
-				str.push(obj);
-			}
-			if(cType===8){
-				allowed=type0;
-				asterick=empty;
-				inc(ptc,4).push(4);
-				str.push(obj);
-				str.push({value:"(",type:4,pre:0,show:"("});
-			}
-			else if(cType===9){
-				if(pre.type===9){
-					if(pre.value===Mexp.math.add){
-						pre.value=cEv;
-						pre.show=cShow;
-						inc(ptc,1);
-					}
-					else if(pre.value===Mexp.math.sub&&cShow==='-'){
-						pre.value=Mexp.math.add;
-						pre.show='+';
-						inc(ptc,1);
-					}
-				}
-				else if(pre.type!==5&&pre.type!==7&&pre.type!==1&&pre.type!==3&&pre.type!==13){//changesign only when negative is found
-					if(cToken==='-'){//do nothing for + token
-									//don't add with the above if statement as that will run the else statement of parent if on Ctoken +
-						allowed=type0;
-						asterick=empty;
-						inc(ptc,2).push(2);
-						str.push({value:Mexp.math.changeSign,type:0,pre:21,show:"-"});
-						str.push({value:"(",type:4,pre:0,show:"("});
-					}
-				}
-				else{
-					str.push(obj);
-					inc(ptc,2);
-				}
-				allowed=type0;
-				asterick=empty;
-			}
-			else if(cType===10){
-				allowed=type0;
-				asterick=empty;
-				inc(ptc,2);
-				str.push(obj);
-			}
-			else if(cType===11){
-				allowed=type0;
-				asterick=empty;
-				str.push(obj);
-			}
-			else if(cType===12){
-				allowed=type0;
-				asterick=empty;
-				inc(ptc,6).push(6);
-				str.push(obj);
-				str.push({value:"(",type:4,pre:0});
-			}
-			else if(cType===13){
-				allowed=type1;
-				asterick=type_3;
-				str.push(obj);
-			}
-			inc(ptc,-1);
-			prevKey=key;
-		}
-		for(var j=ptc.length;j--;){	//loop over ptc
-			if(ptc[j]===0){
+    // newAr is a specially designed data structure in which 1D array at location one of 2d array has all string with length 1 2 with 2 and so on
 
-				str.push({value:")",show:")",type:5,pre:3});
-				inc(ptc,-1).pop();
-			}
-		}
-		if (allowed[5]!==true) {
-			throw(new Mexp.exception("complete the expression"));
-		}
-		while(bracToClose--)
-			str.push({value:")",show:")",type:5,pre:3});
+    if (x < newAr.length) { // match to check if token is really huge and not existing
+    // if not checked it will break in next line as undefined index
+      for (var y = 0; y < newAr[x].length; y++) {
+        if (tokens[i].token === newAr[x][y]) {
+          temp = token.indexOf(newAr[x][y])
+          break
+        }
+      }
+    }
+    if (temp === -1) {
+      token.push(tokens[i].token)
+      type.push(tokens[i].type)
+      if (newAr.length <= tokens[i].token.length) {
+        newAr[tokens[i].token.length] = []
+      }
+      newAr[tokens[i].token.length].push(tokens[i].token)
+      eva.push(tokens[i].value)
+      show.push(tokens[i].show)
+    } else {
+      token[temp] = tokens[i].token
+      type[temp] = tokens[i].type
+      eva[temp] = tokens[i].value
+      show[temp] = tokens[i].show
+    }
+  }
+}
+Mexp.lex = function (inp, tokens) {
+  'use strict'
+  var changeSignObj = {
+    value: Mexp.math.changeSign,
+    type: 0,
+    pre: 21,
+    show: '-'
+  }
+  var closingParObj = {
+    value: ')',
+    show: ')',
+    type: 5,
+    pre: 0
+  }
+  var openingParObj = {
+    value: '(',
+    type: 4,
+    pre: 0,
+    show: '('
+  }
+  var str = [openingParObj]
+  var ptc = [] // Parenthesis to close at the beginning is after one token
+  var inpStr = inp
+  var key
+  var allowed = type0
+  var bracToClose = 0
+  var asterick = empty
+  var prevKey = ''
+  var i, x, y
+  if (typeof tokens !== 'undefined') {
+    Mexp.addToken(tokens)
+  }
+  var obj = {}
+  for (i = 0; i < inpStr.length; i++) {
+    if (inpStr[i] === ' ') {
+      continue
+    }
+    key = ''
+    for (x = (inpStr.length - i > (newAr.length - 2) ? newAr.length - 1 : inpStr.length - i); x > 0; x--) {
+      for (y = 0; y < newAr[x].length; y++) {
+        if (match(inpStr, newAr[x][y], i, x)) {
+          key = newAr[x][y]
+          y = newAr[x].length
+          x = 0
+        }
+      }
+    }
+    i += key.length - 1
+    if (key === '') {
+      throw (new Mexp.Exception('Can\'t understand after ' + inpStr.slice(i)))
+    }
+    var index = token.indexOf(key)
+    var cToken = key
+    var cType = type[index]
+    var cEv = eva[index]
+    var cPre = preced[cType]
+    var cShow = show[index]
+    var pre = str[str.length - 1]
+    var j
+    for (j = ptc.length; j--;) { // loop over ptc
+      if (ptc[j] === 0) {
+        if ([0, 2, 3, 4, 5, 9, 11, 12, 13].indexOf(cType) !== -1) {
+          if (allowed[cType] !== true) {
+            throw (new Mexp.Exception(key + ' is not allowed after ' + prevKey))
+          }
+          str.push(closingParObj)
+          allowed = type1
+          asterick = type3Asterick
+          inc(ptc, -1).pop()
+        }
+      } else break
+    }
+    if (allowed[cType] !== true) {
+      throw (new Mexp.Exception(key + ' is not allowed after ' + prevKey))
+    }
+    if (asterick[cType] === true) {
+      cType = 2
+      cEv = Mexp.math.mul
+      cShow = '&times;'
+      cPre = 3
+      i = i - key.length
+    }
+    obj = {
+      value: cEv,
+      type: cType,
+      pre: cPre,
+      show: cShow
+    }
+    if (cType === 0) {
+      allowed = type0
+      asterick = empty
+      inc(ptc, 2).push(2)
+      str.push(obj)
+      str.push(openingParObj)
+    } else if (cType === 1) {
+      if (pre.type === 1) {
+        pre.value += cEv
+        inc(ptc, 1)
+      } else {
+        str.push(obj)
+      }
+      allowed = type1
+      asterick = type1Asterick
+    } else if (cType === 2) {
+      allowed = type0
+      asterick = empty
+      inc(ptc, 2)
+      str.push(obj)
+    } else if (cType === 3) { // constant
+      str.push(obj)
+      allowed = type1
+      asterick = type3Asterick
+    } else if (cType === 4) {
+      inc(ptc, 1)
+      bracToClose++
+      allowed = type0
+      asterick = empty
+      str.push(obj)
+    } else if (cType === 5) {
+      if (!bracToClose) {
+        throw (new Mexp.Exception('Closing parenthesis are more than opening one, wait What!!!'))
+      }
+      bracToClose--
+      allowed = type1
+      asterick = type3Asterick
+      str.push(obj)
+    } else if (cType === 6) {
+      if (pre.hasDec) {
+        throw (new Mexp.Exception('Two decimals are not allowed in one number'))
+      }
+      if (pre.type !== 1) {
+        pre = {
+          value: 0,
+          type: 1,
+          pre: 0
+        } // pre needs to be changed as it will the last value now to be safe in later code
+        str.push(pre)
+        inc(ptc, -1)
+      }
+      allowed = type6
+      inc(ptc, 1)
+      asterick = empty
+      pre.value += cEv
+      pre.hasDec = true
+    } else if (cType === 7) {
+      allowed = type1
+      asterick = type3Asterick
+      inc(ptc, 1)
+      str.push(obj)
+    }
+    if (cType === 8) {
+      allowed = type0
+      asterick = empty
+      inc(ptc, 4).push(4)
+      str.push(obj)
+      str.push(openingParObj)
+    } else if (cType === 9) {
+      if (pre.type === 9) {
+        if (pre.value === Mexp.math.add) {
+          pre.value = cEv
+          pre.show = cShow
+          inc(ptc, 1)
+        } else if (pre.value === Mexp.math.sub && cShow === '-') {
+          pre.value = Mexp.math.add
+          pre.show = '+'
+          inc(ptc, 1)
+        }
+      } else if (pre.type !== 5 && pre.type !== 7 && pre.type !== 1 && pre.type !== 3 && pre.type !== 13) { // changesign only when negative is found
+        if (cToken === '-') { // do nothing for + token
+          // don't add with the above if statement as that will run the else statement of parent if on Ctoken +
+          allowed = type0
+          asterick = empty
+          inc(ptc, 2).push(2)
+          str.push(changeSignObj)
+          str.push(openingParObj)
+        }
+      } else {
+        str.push(obj)
+        inc(ptc, 2)
+      }
+      allowed = type0
+      asterick = empty
+    } else if (cType === 10) {
+      allowed = type0
+      asterick = empty
+      inc(ptc, 2)
+      str.push(obj)
+    } else if (cType === 11) {
+      allowed = type0
+      asterick = empty
+      str.push(obj)
+    } else if (cType === 12) {
+      allowed = type0
+      asterick = empty
+      inc(ptc, 6).push(6)
+      str.push(obj)
+      str.push(openingParObj)
+    } else if (cType === 13) {
+      allowed = type1
+      asterick = type3Asterick
+      str.push(obj)
+    }
+    inc(ptc, -1)
+    prevKey = key
+  }
+  for (j = ptc.length; j--;) { // loop over ptc
+    if (ptc[j] === 0) {
+      str.push(closingParObj)
+      inc(ptc, -1).pop()
+    } else break  // if it is not zero so before ptc also cant be zero
+  }
+  if (allowed[5] !== true) {
+    throw (new Mexp.Exception('complete the expression'))
+  }
+  while (bracToClose--) {
+    str.push(closingParObj)
+  }
 
-		str.push({type:5,value:")",show:")",pre:0});
-//        console.log(str);
-		return new Mexp(str);
-	};
-    module.exports=Mexp;
+  str.push(closingParObj)
+  console.log(str, inp)
+  //        console.log(str);
+  return new Mexp(str)
+}
+module.exports = Mexp

src/math_function.js

@@ -1,120 +0,130 @@
-	var Mexp=function(parsed){
-		this.value=parsed;
+var Mexp = function (parsed) {
+  this.value = parsed
+}
 
-	};
-
-	Mexp.math={
-		isDegree:true, //mode of calculator
-		acos:function(x){
-			return (Mexp.math.isDegree?180/Math.PI*Math.acos(x):Math.acos(x));
-		},
-		add:function(a,b){
-			return a+b;
-		},
-		asin:function(x){
-			return (Mexp.math.isDegree?180/Math.PI*Math.asin(x):Math.asin(x));
-		},
-		atan:function(x){
-			return (Mexp.math.isDegree?180/Math.PI*Math.atan(x):Math.atan(x));
-		},
-		acosh:function(x){
-			return Math.log(x+Math.sqrt(x*x-1));
-		},
-		asinh:function(x){
-			return Math.log(x+Math.sqrt(x*x+1));
-		},
-		atanh:function(x){
-			return Math.log((1+x)/(1-x));
-		},
-		C:function(n,r){
-			var pro=1,other=n-r,choice=r;
-			if(choice<other){
-			choice=other;
-			other=r;
-			}
-			for(var i=choice+1;i<=n;i++)
-				pro*=i;
-			return pro/Mexp.math.fact(other);
-		},
-		changeSign:function(x){
-			return -x;
-		},
-		cos:function(x){
-			if(Mexp.math.isDegree)x=Mexp.math.toRadian(x);
-			return Math.cos(x);
-		},
-		cosh:function(x){
-			return (Math.pow(Math.E,x)+Math.pow(Math.E,-1*x))/2;
-		},
-		div:function(a,b){
-		return a/b;
-		},
-		fact:function(n) {
-		if(n%1!==0)return "NAN";
-			var pro=1;
-			for(var i=2;i<=n;i++)
-				pro*=i;
-			return pro;
-		},
-		inverse:function(x){
-			return 1/x;
-		},
-		log:function(i){
-			return Math.log(i)/Math.log(10);
-		},
-		mod:function(a,b){
-		return a%b;
-		},
-		mul:function(a,b){
-		return a*b;
-		},
-		P:function(n,r){var pro=1;
-			 for(var i=Math.floor(n)-Math.floor(r)+1;i<=Math.floor(n);i++)
-					pro*=i;
-					return pro;
-
-		},
-		Pi:function(low,high,ex){
-			var pro=1;
-			for(var i=low;i<=high;i++){
-				pro*=Number(ex.postfixEval({n:i}));
-			}
-			return pro;
-		},
-		pow10x:function(e){
-			var x=1;
-			while(e--){x*=10;}
-			return x;
-		},
-		sigma:function(low,high,ex){
-			var sum=0;
-			for(var i=low;i<=high;i++){
-				sum+=Number(ex.postfixEval({n:i}));
-			}
-			return sum;
-		},
-		sin:function(x){
-			if(Mexp.math.isDegree)x=Mexp.math.toRadian(x);
-			return Math.sin(x);
-		},
-		sinh:function(x){
-			return (Math.pow(Math.E,x)-Math.pow(Math.E,-1*x))/2;
-		},
-		sub:function(a,b){
-		return a-b;
-		},
-		tan:function(x){
-			if(Mexp.math.isDegree)x=Mexp.math.toRadian(x);
-			return Math.tan(x);
-		},
-		tanh:function(x){
-			return Mexp.sinha(x)/Mexp.cosha(x);
-		},
-		toRadian:function(x){
-			return x*Math.PI/180;
-		}
-	};
-	Mexp.exception=function(message){
-		this.message=message;
-	};
-    module.exports=Mexp;
+Mexp.math = {
+  isDegree: true, // mode of calculator
+  acos: function (x) {
+    return (Mexp.math.isDegree ? 180 / Math.PI * Math.acos(x) : Math.acos(x))
+  },
+  add: function (a, b) {
+    return a + b
+  },
+  asin: function (x) {
+    return (Mexp.math.isDegree ? 180 / Math.PI * Math.asin(x) : Math.asin(x))
+  },
+  atan: function (x) {
+    return (Mexp.math.isDegree ? 180 / Math.PI * Math.atan(x) : Math.atan(x))
+  },
+  acosh: function (x) {
+    return Math.log(x + Math.sqrt(x * x - 1))
+  },
+  asinh: function (x) {
+    return Math.log(x + Math.sqrt(x * x + 1))
+  },
+  atanh: function (x) {
+    return Math.log((1 + x) / (1 - x))
+  },
+  C: function (n, r) {
+    var pro = 1
+    var other = n - r
+    var choice = r
+    if (choice < other) {
+      choice = other
+      other = r
+    }
+    for (var i = choice + 1; i <= n; i++) {
+      pro *= i
+    }
+    return pro / Mexp.math.fact(other)
+  },
+  changeSign: function (x) {
+    return -x
+  },
+  cos: function (x) {
+    if (Mexp.math.isDegree) x = Mexp.math.toRadian(x)
+    return Math.cos(x)
+  },
+  cosh: function (x) {
+    return (Math.pow(Math.E, x) + Math.pow(Math.E, -1 * x)) / 2
+  },
+  div: function (a, b) {
+    return a / b
+  },
+  fact: function (n) {
+    if (n % 1 !== 0) return 'NaN'
+    var pro = 1
+    for (var i = 2; i <= n; i++) {
+      pro *= i
+    }
+    return pro
+  },
+  inverse: function (x) {
+    return 1 / x
+  },
+  log: function (i) {
+    return Math.log(i) / Math.log(10)
+  },
+  mod: function (a, b) {
+    return a % b
+  },
+  mul: function (a, b) {
+    return a * b
+  },
+  P: function (n, r) {
+    var pro = 1
+    for (var i = Math.floor(n) - Math.floor(r) + 1; i <= Math.floor(n); i++) {
+      pro *= i
+    }
+    return pro
+  },
+  Pi: function (low, high, ex) {
+    var pro = 1
+    for (var i = low; i <= high; i++) {
+      pro *= Number(ex.postfixEval({
+        n: i
+      }))
+    }
+    return pro
+  },
+  pow10x: function (e) {
+    var x = 1
+    while (e--) {
+      x *= 10
+    }
+    return x
+  },
+  sigma: function (low, high, ex) {
+    var sum = 0
+    for (var i = low; i <= high; i++) {
+      sum += Number(ex.postfixEval({
+        n: i
+      }))
+    }
+    return sum
+  },
+  sin: function (x) {
+    if (Mexp.math.isDegree) x = Mexp.math.toRadian(x)
+    return Math.sin(x)
+  },
+  sinh: function (x) {
+    return (Math.pow(Math.E, x) - Math.pow(Math.E, -1 * x)) / 2
+  },
+  sub: function (a, b) {
+    return a - b
+  },
+  tan: function (x) {
+    if (Mexp.math.isDegree) x = Mexp.math.toRadian(x)
+    return Math.tan(x)
+  },
+  tanh: function (x) {
+    return Mexp.sinha(x) / Mexp.cosha(x)
+  },
+  toRadian: function (x) {
+    return x * Math.PI / 180
+  }
+}
+Mexp.Exception = function (message) {
+  this.message = message
+}
+module.exports = Mexp

test/index.js

@@ -41,2 +41,7 @@ // This test is for node JS
     assert.equal(a.lex("3^2-2^2").toPostfix().postfixEval(),5);
+
+    assert.equal(
+      Math.round((a.eval("(4-(2-1)^2)^.5") + Number.EPSILON) * 100) / 100,
+      Math.round((Math.sqrt(3) + Number.EPSILON) * 100) / 100
+    )
   });
@@ -106,3 +111,6 @@
   it('tan5(6+3)', function () {
-	 assert.equal(a.eval("tan5(6+3)"),"1");
+	 assert.equal(
+      Math.round((a.eval("tan45(6+3)") + Number.EPSILON) * 100) / 100,
+      Math.round((9 + Number.EPSILON) * 100) / 100
+  );
   });
@@ -117,2 +125,10 @@ it('tan(40+5)', function () {
 	 assert.equal(a.eval("root4"),"2");
+    assert.equal(
+      Math.round((a.eval("root(4-1^2)") + Number.EPSILON) * 100) / 100,
+      Math.round((Math.sqrt(3) + Number.EPSILON) * 100) / 100
+    )
+    assert.equal(
+      Math.round((a.eval("root(4-(2-1)^2)") + Number.EPSILON) * 100) / 100,
+      Math.round((Math.sqrt(3) + Number.EPSILON) * 100) / 100
+    )
   });
@@ -175,1 +191,6 @@ it('checks + precedence before number insise parenthesis ', function () {
 });
+describe('Check autoclose of parenthesis of parser', function () {
+  it('should tell to compllete expression', function () {
+    assert.equal(a.eval("((2+3*4"),"14");
+  });
+});

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Number of package files

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increased by27.27%

Lines of code

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