mathjslab
v1.6.1
Published
MathJSLab - An interpreter with language syntax like MATLAB®/Octave, ISBN 978-65-00-82338-7.
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MathJSLab - mathjslab.com
An interpreter with language syntax like MATLAB®/Octave written in Typescript.
This package emulates a parser and evaluator for a subset of MATLAB®/Octave language. It is written completely in Typescript.
The project page with a functional demo use of this package in a Web application can be found at mathjslab.com. The repository is in the MathJSLab Organization on GitHub.
It can run in browser environment and implements an arbitrary precision arithmetics using decimal.js package.
It uses the ANTLR parser generator to generate a parser that create an AST (Abstract Syntax Tree) of input.
Other components besides the parser are the evaluator, which computes the inputs, and the MathML unparser, that generates mathematical representations of the inputs and results.
This software is intended for educational purposes, to provide teachers and students with a computer aided calculation tool that is capable of running in a browser environment. So it can be easily adapted to be used on different devices and environments.
All MathJSLab
interpreter
operations, functions and commands are documented in the
demo Web application's command
help NAME
. Its in
english,
portuguese
and spanish.
It can also be accessed directly from the
demo Web application repository.
Additional documentation, beyond the operations, functions and commands, is
available in the
demo Web application doc
directory.
Features
- Runs on any JavaScript engine.
- Improved demo Web application at project page: mathjslab.com (repository).
- Comes with a large set of built-in operations, functions and commands well documented in the demo Web application in english, portuguese and spanish.
- Is easily extensible through configuration parameters passed to
Evaluator
constructor. - Open source software with fully documented code: MIT License.
- Includes test suite using Jest framework.
- Software with assigned ISBN and DOI, so that it can be used in academic work and research, being referenced appropriately. Any inclusion of authors will result in an update of the ISBN records.
Browser support
MathJSLab works on any ES2015 compatible JavaScript engine, including Node.js®, Chrome, Firefox, Safari, Opera, and Edge.
Installation
Install the mathjslab
package:
npm install mathjslab
Usage
The basic API is an instantiation of Evaluator
class with optional configuration.
import { Evaluator, TEvaluatorConfig } from 'mathjslab';
Instantiate the Evaluator
class with:
let evaluator: Evaluator = new Evaluator(EvaluatorConfiguration);
Examples
- Parsing:
let input: AST.NodeInput = evaluator.Parse('x=sqrt(1+2*3)');
- Evaluation:
let result: AST.NodeInput = evaluator.Evaluate(input);
- MathML generation:
let mathmlInput: string = evaluator.UnparseMathML(input);
let mathmlResult: string = evaluator.UnparseMathML(result);
Using a CDN
You can optimize your application by reducing the size of your bundle by loading MathJSLab package through a CDN.
You can use UNPKG, jsDelivr, or any other CDN that delivers content from the npm repository.
Using UNPKG
To load MathJSLab package through UNPKG CDN copy the following HTML code:
<script src="https://www.unpkg.com/mathjslab"></script>
Using jsDelivr
To load MathJSLab package through jsDelivr CDN copy the following HTML code:
<script src="https://cdn.jsdelivr.net/npm/mathjslab/lib/mathjslab.min.js"></script>
MathJSLab module use
The UMD module will be loaded with mathjslab
name. You can instantiate Evaluator
with:
let evaluator = new mathjslab.Evaluator(EvaluatorConfiguration);
Contributing
To contribute to this project see our contributing guidelines.
Join the community chat:
Project build and test
To build the project, you only need Node.js® and
the Java Runtime Environment installed. The
project build and dependencies are managed by
npm through scripts in the
package.json
file. The build scripts download the latest version of
ANTLR into the resources directory for use by the
project. The test suite uses the Jest
framework.
Build scripts
The following build scripts are defined:
- Before building and testing
mathjslab
, to initialize the project workspace, run:
npm run update
This will update the dependencies, install all of them, and download the latest version of ANTLR, preparing any resources needed to build the project.
- Run the
mathjslab
tests:
npm run test
- Format and lint
mathjslab
code:
npm run format:lint
- Build
mathjslab
package:
npm run build
- To cleanup all build files in workspace use:
npm run clean
- To delete resources and dependencies, the
package-lock.json
file andnode_modules
directory too, use:
npm run clean:all
After run this command you will need to do workspace setup running
npm run update
again.
Language subset
Currently only the mathematical expressions of the language are implemented. The control and loop structures are not yet implemented.
There are some differences from the original MATLAB®/Octave. The main difference is that there are only one a complex numeric type. Other implemented types is boolean, character string, structure and function handle.
Common arrays (not only cell arrays) can hold any type of element.
License
Copyright © 2016-2024 Sergio Lindau, mathjslab.com, ISBN 978-65-00-82338-7.
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.