A simple and lightweight math library, that can parse and calculate string expressions.

Last update: Nov 20, 2022

Related tags

Overview

Documentation

Create local instance of expression parser.

final ExpressionParser expressionParser = ExpressionParser();

Then you can calculate your "string" expression like:

23 ">

final String exp = "-2 + 5 + 10 * 2";
final double? result = expressionParser.calculate(exp); // --> 23

When we call calculate, it checks the validness of expression automatically. So, we needn't to do some manual checking here. (If expression is invalid, then result would be null)

But in anyways, if you wanna check the validness of expression manually, you can do it, like:

final bool isInvalid = expressionParser.isInvalidExp(exp) // --> false

Also, you can enable, taking the sum of the last result and current by setting keepAddingOn to true.

So, when you enable it, parser allways store your last expression parts. By doing that it can take sum of the last result you got, and the current one.

For example: you calculate "8+2" and got 10 as result. Parser keeps ["8", "+2"] as parts of expression. So, when you make operation after that one, e.g: "2+3", then parts of expression would be: ["8", "+2", "2", "+3"] So, the final result would be (8+2) + (2+3) = 15.

Check official example to see the UI implementation of Mate

Explanation

Parser divides string expression as parts (Stores them in custom Expression class), then loops through the parts and takes sum of them. If string expression is "2+5" then parts would be: ["2", "+5"]. So the sum of parts would be 2+(+5) --> 7.

Let's see with default example: "-2 + 5 + 10 * 2". In this case, parts would be: ["-2", "+5", "10*2"]. We got "10*2" at the end of the part, because of operation priority. So, the final result would be: -2+(+5)+(10*2) --> 3+20 --> 23.

Comments

feature/improve errors
This PR adds high level errors to the calculator.

Commits:

feat: improve repl by adding token logger

bugfix: fix sign-number reading issue of lexer

hotfix: fix the calculator's index overflow issue

feat: add index field to the token structure

feat: improve current error cases

feat: implement indexed errors
opened by theiskaa 1
feature/absolute value
Adds the absolute value functionality and updated error handling and errors.

Commits:

feat: improve repl by adding token logger

bugfix: fix sign-number reading issue of lexer

hotfix: fix the calculator's index overflow issue

feat: add index field to the token structure

feat: improve current error cases

feat: implement indexed errors

hotfix: fix typo on changelog

hotfix: rename the ROOT related actions to POWER

feat: implement abs to token, tokentype, sub

feat: improve the sub implementation to [token] and [monitor]

feat: re-impl the abs [token-type] implementation

feat: impl abs parsing to lexer

feat: impl the abs calculator execution

chore: update documentations

documentation feature
opened by theiskaa 0
Feature/improve errors
This PR adds high level errors to the calculator.

Commits:

feat: improve repl by adding token logger

bugfix: fix sign-number reading issue of lexer

hotfix: fix the calculator's index overflow issue

feat: add index field to the token structure

feat: improve current error cases

feature
opened by theiskaa 0
feature/root
Adds support to parse and calculate power root expressions.

5 ^ 2 -> 2th power of 5 -> 25

Commits:

feat: add root token

feat: improve token monitoring

feat: impl functionality to collect roots in sub-exps

feat: implement combine_roots method's functionality

feat: impl power calculating to calculator

feat: add root tests to lexer

chore: update v0.1.3 related documentation

feature
opened by theiskaa 0

feature/auto-multiplication

Diagram:

Auto append multiplication ◀╮
if there is no sign between │ two "number"(normal number and sub-exp) token.
   ╭──────────────────╭─────╯
╭─ ▼ ───────╮     ╭── ▼ ─────────╮
│ 4(2 + 10) │ ──▶ │ 4 • (2 + 10) │
╰───────────╯     ╰──────────────╯

Description:

Adds a simple functionality to parse and understood kinda algebric expressions: For example: 5(5 / 2) is same as 5 * (5 / 2), In this case, to make calculator understood this expression, we have to add a PRODUCT(multiplication) token manually between two token numbers. (in this case between 5 and (5 / 2)).

feature

opened by theiskaa 0

Feature/parentheses
Resolves: #3

TODO:

[x] Aditional tests for parentheses expressions

[x] Test deeply, parsing too-high nested expressions

[x] Imrpove expression's invalidness chcecker.

feature
opened by theiskaa 0
calculate factorial numbers

In mathematics, the factorial of a non-negative integer n, denoted by n!, is the product of all positive integers less than or equal to n. The factorial n! also equals the product of n with the next smaller factorial.

So how does factorial computing work? Example;

5! = 5 * 4 * 3 * 2 * 1 = 120

opened by onurhan1337 1

Releases(v0.1.4)

v0.1.4(Nov 2, 2022)
v0.1.4

The fifth version of mate.

Added high-level error handling and errors: see in docs

Implemented functionality to parse and calculate absolute-value expressions.

Pull Requests: #22 & #23

H-E that versions has ability to solve: [ 2 - 12 ] / 2 -> 5

Source code(tar.gz)
Source code(zip)

Owner

Ismael Shakverdiev

Self-taught, language-agnostic programmer

GitHub https://pub.dev/packages/mate

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A simple and lightweight math library, that can parse and calculate string expressions.

Related tags

Overview

Documentation

Explanation

Comments

feature/improve errors

Commits:

feature/absolute value

Commits:

Feature/improve errors

Commits:

feature/root

Adds support to parse and calculate power root expressions.

Commits:

feature/auto-multiplication

Diagram:

Description:

Feature/parentheses

TODO:

calculate factorial numbers

Releases(v0.1.4)

v0.1.4(Nov 2, 2022)

v0.1.4

Owner

Ismael Shakverdiev

Complete clean coded monitized flutter and firebase math app

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