Module Description
Math Field (Mathematical Expression Field Formatter)
A simple lexer and parser that can compute simple mathematical operations using the most basic operators `+, -, *, /` and can correctly handle parentheses `()` and floating point operations (decimal numbers). It can NOT currently handle negative numbers or unary operations.
It is implemented as a Drupal 8 service module and provides a text field formatter.
The formatter currently displays errors inline.
Requirements
* Drupal 8.x version
Installation
Download, install and enable as you normally install a Drupal 8 module hosted on drupal.org
composer require drupal/math_field drush en math_fieldUsage
After enabling the module create a `text field` in your content type and choose `Math field formatter` as a formatter at admin/structure/types/manage/CONTENT_TYPE/display
The formatter will display both the expression and the result (or error message): (1 + 2) * 4 = 12
The result will be revealed on hover with a delayed CSS animation.
Features
1. The Parser needs to be able to compute simple mathematical operations using the most basic operators (+, -, *, /) without using eval(). For example: “10 + 20 - 30 + 15 * 5” should return 75. 2. Make sure you take care of operator precedence using infix notation. 3. Provide a field formatter plugin in a Drupal 8 module that uses this Service. 4. Deliver the work as a Drupal 8 site with the custom module in a git repository. 5. Provide a simple unit test with a data provider (@dataProvider) that tests the tokenization (lexing) and parsing of a few different computations. 6. Provide a GraphQL field formatter so that the field can be consumed on the frontend via GraphQL. (Under development) 7. Add a frontend component in a template language (Twig, React) of your choice that will animate the calculation in the frontend, i.e. you first show the entire formula and on-hover, the text transitions into the computed outcome.
Submission
You need to make sure that by the end of the assessment everything needed is handed in as a Drupal repository. Besides implementing the requirements, the Drupal repository needs to specify a README document with all steps needed to install and run your code.
Inspiration
* Initial development was done by Giorgos Kontopoulos as a test exercise (github).
* Shunting-yard algorithm (wikipedia)
* University of Cambridge
* Rules (D8 module)
* Parsing and lexing
* https://github.com/vuchkov/math-php
* https://github.com/vuchkov/math-parser
A simple lexer and parser that can compute simple mathematical operations using the most basic operators `+, -, *, /` and can correctly handle parentheses `()` and floating point operations (decimal numbers). It can NOT currently handle negative numbers or unary operations.
It is implemented as a Drupal 8 service module and provides a text field formatter.
The formatter currently displays errors inline.
Requirements
* Drupal 8.x version
Installation
Download, install and enable as you normally install a Drupal 8 module hosted on drupal.org
composer require drupal/math_field drush en math_fieldUsage
After enabling the module create a `text field` in your content type and choose `Math field formatter` as a formatter at admin/structure/types/manage/CONTENT_TYPE/display
The formatter will display both the expression and the result (or error message): (1 + 2) * 4 = 12
The result will be revealed on hover with a delayed CSS animation.
Features
1. The Parser needs to be able to compute simple mathematical operations using the most basic operators (+, -, *, /) without using eval(). For example: “10 + 20 - 30 + 15 * 5” should return 75. 2. Make sure you take care of operator precedence using infix notation. 3. Provide a field formatter plugin in a Drupal 8 module that uses this Service. 4. Deliver the work as a Drupal 8 site with the custom module in a git repository. 5. Provide a simple unit test with a data provider (@dataProvider) that tests the tokenization (lexing) and parsing of a few different computations. 6. Provide a GraphQL field formatter so that the field can be consumed on the frontend via GraphQL. (Under development) 7. Add a frontend component in a template language (Twig, React) of your choice that will animate the calculation in the frontend, i.e. you first show the entire formula and on-hover, the text transitions into the computed outcome.
Submission
You need to make sure that by the end of the assessment everything needed is handed in as a Drupal repository. Besides implementing the requirements, the Drupal repository needs to specify a README document with all steps needed to install and run your code.
Inspiration
* Initial development was done by Giorgos Kontopoulos as a test exercise (github).
* Shunting-yard algorithm (wikipedia)
* University of Cambridge
* Rules (D8 module)
* Parsing and lexing
* https://github.com/vuchkov/math-php
* https://github.com/vuchkov/math-parser
Module Link
Project Usage
58
Security Covered
Covered By Security Advisory
Version Available
Production
Module Summary
This module aims to solve the problem of computing simple mathematical operations using basic operators and parentheses in a Drupal 8 environment, providing a text field formatter for displaying the results with error handling.
Data Name
math_field
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