Math expression tokenizer for expression validation

Install:

npm install mathtokenizer --save

Library:

token: {type, value} object

tokenize: function that takes in string math expression and returns array with tokens, also takes in an optional integer [0-2] variable for choosing only a delimiter as a function delimiter. The default is 3, which doesn't force any particular delimiter and recognizes as function any alphanumerical expression right before the opening delimiter.

	tokenize(exp, index /*optional*/) 

Index	Delimiter
0	(
1	{
2	[
3	Default, particular delimiter

In the new version (^1.1.0), it's no longer lparenthesis or rparenthesis, it's rather ldelimiter and rdelimiter.

Examples:

Example1:

	let tokenizer = require('mathtokenizer')
	let A = tokenizer.tokenize("sin(-3x)")
	console.log(A)
	/*Code produced:
		[
		  token { type: 'function', value: 'sin' },
		  token { type: 'ldelimiter', value: '(' },
		  token { type: 'unary_operator', value: '-' },
		  token { type: 'number', value: '3' },
		  token { type: 'operator', value: '*' },
		  token { type: 'variable', value: 'x' },
		  token { type: 'rdelimiter', value: ')' }
		]
	*/

Example2:

	let tokenizer = require('mathtokenizer')
	let A = tokenizer.tokenize("f1(x+2)")
	console.log(A)
	/*Code produced:
		[
		  token { type: 'function', value: 'f1' },
		  token { type: 'ldelimiter', value: '(' },
		  token { type: 'variable', value: 'x' },
		  token { type: 'operator', value: '+' },
		  token { type: 'number', value: '2' },
		  token { type: 'rdelimiter', value: ')' }
		]
	*/

Example3:

Same as in example2, but this time with the optional argument being assigned the value 1: curly braces

	let tokenizer = require('mathtokenizer')
	let A = tokenizer.tokenize("f1(x+2)", 1) //Optional argument is given 1
	console.log(A)
	/*Code produced:
		[
			token { type: 'variable', value: 'f1' }, //f1 is recognized as a variable this time because it's followed by a parenthesis and not a curly brace
			token { type: 'operator', value: '*' },
			token { type: 'ldelimiter', value: '(' },
			token { type: 'variable', value: 'x' },
			token { type: 'operator', value: '+' },
			token { type: 'number', value: '2' },
			token { type: 'rdelimiter', value: ')' }
		]
	*/