hoa / math
The Hoa\Math library.
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Requires
- hoa/compiler: ~3.0
- hoa/consistency: ~1.0
- hoa/exception: ~1.0
- hoa/iterator: ~2.0
- hoa/protocol: ~1.0
- hoa/zformat: ~1.0
Requires (Dev)
- hoa/test: ~2.0
This package is auto-updated.
Last update: 2021-09-20 08:31:28 UTC
README
Hoa is a modular, extensible and
structured set of PHP libraries.
Moreover, Hoa aims at being a bridge between industrial and research worlds.
Hoa\Math
This library provides tools around mathematical operations.
Installation
With Composer, to include this library into
your dependencies, you need to
require hoa/math
:
$ composer require hoa/math '~1.0'
For more installation procedures, please read the Source page.
Testing
Before running the test suites, the development dependencies must be installed:
$ composer install
Then, to run all the test suites:
$ vendor/bin/hoa test:run
For more information, please read the contributor guide.
Quick usage
We propose a quick overview of one feature: evaluation of arithmetical expressions.
Evaluation of arithmetical expressions
The hoa://Library/Math/Arithmetic.pp
describes the form of an arithmetical
expression. Therefore, we will use the classical workflow when manipulating a
grammar, that involves the Hoa\Compiler
library and the
Hoa\Math\Visitor\Arithmetic
class.
// 1. Load the compiler. $compiler = Hoa\Compiler\Llk::load( new Hoa\File\Read('hoa://Library/Math/Arithmetic.pp') ); // 2. Load the visitor, aka the “evaluator”. $visitor = new Hoa\Math\Visitor\Arithmetic(); // 3. Declare the expression. $expression = '1 / 2 / 3 + 4 * (5 * 2 - 6) * PI / avg(7, 8, 9)'; // 4. Parse the expression. $ast = $compiler->parse($expression); // 5. Evaluate. var_dump( $visitor->visit($ast) ); /** * Will output: * float(6.4498519738463) */ // Bonus. Print the AST of the expression. $dump = new Hoa\Compiler\Visitor\Dump(); echo $dump->visit($ast); /** * Will output: * > #addition * > > #division * > > > token(number, 1) * > > > #division * > > > > token(number, 2) * > > > > token(number, 3) * > > #multiplication * > > > token(number, 4) * > > > #multiplication * > > > > #group * > > > > > #substraction * > > > > > > #multiplication * > > > > > > > token(number, 5) * > > > > > > > token(number, 2) * > > > > > > token(number, 6) * > > > > #division * > > > > > token(constant, PI) * > > > > > #function * > > > > > > token(id, avg) * > > > > > > token(number, 7) * > > > > > > token(number, 8) * > > > > > > token(number, 9) */
We can add functions and constants on the visitor, thanks to the addFunction
and addConstant
methods. Thus, we will add the rand
function (with 2
parameters) and the ANSWER
constant, set to 42:
$visitor->addFunction('rand', function ($min, $max) { return mt_rand($min, $max); }); $visitor->addConstant('ANSWER', 42); $expression = 'rand(ANSWER / 2, ANSWER * 2)' var_dump( $visitor->visit($compiler->parse($expression)) ); /** * Could output: * int(53) */
Documentation
The
hack book of Hoa\Math
contains
detailed information about how to use this library and how it works.
To generate the documentation locally, execute the following commands:
$ composer require --dev hoa/devtools $ vendor/bin/hoa devtools:documentation --open
More documentation can be found on the project's website: hoa-project.net.
Getting help
There are mainly two ways to get help:
- On the
#hoaproject
IRC channel, - On the forum at users.hoa-project.net.
Contribution
Do you want to contribute? Thanks! A detailed contributor guide explains everything you need to know.
License
Hoa is under the New BSD License (BSD-3-Clause). Please, see
LICENSE
for details.
Related projects
The following projects are using this library:
- PSIH & PMSIpilot, PSIH is the leading French integrator of business intelligence solutions for the healthcare sector,
- PHP Telegram Bot, Telegram bot based on the official Telegram Bot API.