small fix, added tests, readme

Gruntfile.js

@@ -7,7 +7,12 @@ module.exports = function(grunt) {
       dist: {
         files: [{
           expand: true,
-          src: ['lib/*.js', 'tests/*.js'],
+          src: ['tests/*.js'],
+          dest: 'dist/'
+        }, {
+          expand: true,
+          src: ['lib/*.js'],
+          flatten: true,
           dest: 'dist/'
         }]
       }

bin.js

@@ -0,0 +1,3 @@
+var Equation = require('./dist/index');
+
+console.log(Equation.solve(process.argv[2]));

dist/index.js

@@ -26,7 +26,11 @@ var _import = require('./helpers');
 
 var _ = _interopRequireWildcard(_import);
 
-var Mathstring = {
+var _polyfills = require('babel/polyfill');
+
+var _polyfills2 = _interopRequireWildcard(_polyfills);
+
+var Equation = {
   /**
     * Solves the given math expression, following these steps:
     * 1. Replace constants in the expression
@@ -72,7 +76,7 @@ var Mathstring = {
     var variables = [];
 
     stack.forEach(function (a) {
-      if (!_.isNumber(a) && !_operators2['default'][a] && a === a.toLowerCase()) {
+      if (typeof a === 'string' && !_.isNumber(a) && !_operators2['default'][a] && a === a.toLowerCase()) {
         // grouped variables like (y) need to have their parantheses removed
         variables.push(_.removeSymbols(a));
       }
@@ -91,8 +95,7 @@ var Mathstring = {
         return a;
       });
 
-      console.log(variables, expression);
-      return Mathstring.solve(expression);
+      return Equation.solve(expression);
     };
   }
 };
@@ -168,7 +171,6 @@ var parseExpression = function parseExpression(expression) {
     stack.push(record);
   }
 
-  // $0(stack);
   return parseGroups(stack);
 };
 
@@ -187,9 +189,9 @@ var parseGroups = function parseGroups(stack) {
   // Parantheses become inner arrays which will then be processed first
   var sub = 0;
   return stack.reduce(function (a, b) {
-    if (b[b.length - 1] === '(') {
+    if (b.includes('(')) {
       if (b.length > 1) {
-        _.dive(a, sub).push(b.slice(0, -1), []);
+        _.dive(a, sub).push(b.replace('(', ''), []);
       } else {
         _.dive(a, sub).push([]);
       }
@@ -392,5 +394,5 @@ var replaceConstants = function replaceConstants(expression) {
   });
 };
 
-exports['default'] = Mathstring;
+exports['default'] = Equation;
 module.exports = exports['default'];

dist/readstream.js

@@ -13,7 +13,8 @@ exports['default'] = function (string) {
 
       if (i >= string.length) {
         return null;
-      }return string[i++];
+      }
+      return string[i++];
     },
     current: function current() {
       return string[i - 1];

dist/tests/solve.js

@@ -60,6 +60,10 @@ describe('Functions', function () {
   it('should work for without parantheses', function () {
     _expect.expect(_M2['default'].solve('lg4 * 5')).to.equal(10);
   });
+
+  it('should work for wrapped functions', function () {
+    _expect.expect(_M2['default'].solve('(lg4)*2')).to.equal(4);
+  });
 });
 
 describe('Constats', function () {

lib/README.md

@@ -0,0 +1,14 @@
+Equation
+========
+
+Solve math expressions or create equations for repeated and complex Math tasks.
+
+```javascript
+// solve
+console.log(Equation.solve('4 * lg4 ^ 3')); // 32 
+
+// equations
+let sphereArea = Equation.equation('4 * PI * r^2');
+
+console.log(sphereArea(5)); // 314.1592653589793
+```

lib/index.js

@@ -2,6 +2,7 @@ import ReadStream from './readstream';
 import operators from './operators';
 import constants from './constats';
 import * as _ from './helpers';
+import polyfills from 'babel/polyfill';
 
 let Equation = {
   /**
@@ -49,7 +50,8 @@ let Equation = {
     let variables = [];
 
     stack.forEach(a => {
-      if (!_.isNumber(a) && !operators[a] && a === a.toLowerCase()) {
+      if (typeof a === 'string' && !_.isNumber(a) &&
+          !operators[a] && a === a.toLowerCase()) {
         // grouped variables like (y) need to have their parantheses removed
         variables.push(_.removeSymbols(a));
       }
@@ -131,7 +133,6 @@ const parseExpression = expression => {
     stack.push(record);
   }
 
-  // $0(stack);
   return parseGroups(stack);
 };
 
@@ -150,9 +151,9 @@ const parseGroups = stack => {
   // Parantheses become inner arrays which will then be processed first
   let sub = 0;
   return stack.reduce((a, b) => {
-    if (b[b.length - 1] === '(') {
+    if (b.includes('(')) {
       if (b.length > 1) {
-        _.dive(a, sub).push(b.slice(0, -1), []);
+        _.dive(a, sub).push(b.replace('(', ''), []);
       } else {
         _.dive(a, sub).push([]);
       }

package.json

@@ -22,5 +22,8 @@
     "grunt-eslint": "^11.0.0",
     "grunt-mocha-test": "^0.12.7",
     "mocha": "^2.2.4"
+  },
+  "dependencies": {
+    "babel": "^5.1.11"
   }
 }

tests/solve.js

@@ -53,6 +53,10 @@ describe('Functions', () => {
   it('should work for without parantheses', () => {
     expect(M.solve('lg4 * 5')).to.equal(10);
   });
+
+  it('should work for wrapped functions', () => {
+    expect(M.solve('(lg4)*2')).to.equal(4);
+  });
 });
 
 describe('Constats', () => {