Options

code-distortion/options is a PHP library for managing options in a simple, flexible and expressive way.

use CodeDistortion\Options\Options;

$results = Options::parse('sendAlerts dailyLimit=123.45 !applyDailyLimit currency=AUD plan="Silver Plan"');
// [ 'sendAlerts' => true,
//   'dailyLimit' => 123.45,
//   'applyDailyLimit' => false,
//   'currency' => 'AUD',
//   'plan' => 'Silver Plan' ]

// when used programatically
$options = Options::resolve('sendEmails sendSms !sendSlack');
$value = $options->get('sendEmails'); // true
$value = $options->get('sendSlack'); // false

Installation

Install the package via composer:

composer require code-distortion/options

Usage

The parse() method will take your string and break it down into separate options:

use CodeDistortion\Options\Options;

$results = Options::parse('sendEmails sendSms !sendSlack');
// [ 'sendEmails' => true,
//   'sendSms' => true,
//   'sendSlack' => false ]

Value types

You can specify option values as either expressive strings or arrays of key-value-pairs.

Expressive string format

'myVal' // ['myVal' => true]

// with modifiers
'+myVal' // ['myVal' => true]
'-myVal' // ['myVal' => false]
'!myVal' // ['myVal' => false]

// special values
'myVal=true'   // ['myVal' => true] (boolean true)
'myVal=false'  // ['myVal' => false] (boolean false)
'myVal=null'   // ['myVal' => null] (actual null)
'myVal=100'    // ['myVal' => 100] (an integer)
'myVal=123.45' // ['myVal' => 123.45] (a float)

// strings
'myVal='          // ['myVal' => '']
'myVal=somevalue' // ['myVal' => 'somevalue']

// quoted value strings
'myVal="true"'           // ['myVal' => 'true'] (not a boolean)
'myVal="some value"'     // ['myVal' => 'some value']
'myVal="some \"value\""' // ['myVal' => 'some "value"']
"myVal='some value'"     // ['myVal' => 'some value']
"myVal='some \'value\''" // ['myVal' => "some 'value'"]
"myVal=\"new\nline\""    // ['myVal' => "new\nline"]

// quoted key strings
'"my val"=true'     // ['my val' => true]
'"my \"val\""=true' // ['my "val"' => true]
"'my val'=true"     // ['my val' => true]
"'my \'val\''=true" // ["my 'val'" => true]

Multiple string values can joined together and separated with either spaces " " or a comma , (or both):

'myVal1=abc +myVal2 -myVal3'   // ['myVal1' => 'abc', 'myVal2' => true, 'myVal3' => false']
'myVal1=abc,+myVal2,-myVal3'   // ['myVal1' => 'abc', 'myVal2' => true, 'myVal3' => false']
'myVal1=abc, +myVal2, -myVal3' // ['myVal1' => 'abc', 'myVal2' => true, 'myVal3' => false']

Note: Regular expressions are used to examine the string values above. You may wish to use them for convenience, or use plain arrays like below for faster speed.

Array key-value-pairs

You can specify values simply as arrays:

['myVal' => true]
['myVal' => false]
['myVal' => 'some value']
['my val' => 'some value']
// etc

Note: You can specify non-scalar values with this library (eg. nested arrays), however they aren't dealt with in any special way. They are currently treated like scalar values.

Using in your code

You can use an Options instance to handle values for you programmatically. The resolve() method will parse the input and return the Options object which you can then interrogate in your code:

$options = Options::resolve('sendEmails sendSms !sendSlack');
$has = $options->has('sendEmails'); // true
$has = $options->has('sendTweet');  // false
$value = $options->get('sendEmails'); // true
$value = $options->get('sendTweet');  // null

Specifying default values

You can specify default fall-back values to use by calling defaults():

// set the defaults for the first time (or replaces them completely)
$defaults = 'sendEmails sendSms !sendSlack';
$options = Options::defaults($defaults);

// add to the existing defaults (overriding where necessary)
$quietModeDefaults = '!sendSms';
$options->addDefaults($quietModeDefaults);

// retrieve the defaults back as an array
$options->getDefaults();

Resolving a set of options with defaults

To combine default values and custom values, use the defaults() method and then resolve():

// combine default and custom values
$defaults = 'sendEmails sendSms !sendSlack';
$userPrefs = '!sendEmails sendSms';
$options = Options::defaults($defaults)->resolve($userPrefs);

// check if particular options exist
$has = $options->has('sendEmails'); // true
$has = $options->has('sendTweet');  // false
$has = $options->hasDefault('sendSlack'); // true
$has = $options->hasCustom('sendSlack');  // false

// retrieve individual values from $options
$value = $options->get('sendEmails'); // false
$value = $options->get('sendTweet');  // null
$value = $options->getDefault('sendEmails'); // true
$value = $options->getCustom('sendEmails');  // false

// get the results combined
$results = $options->all();
// [ 'sendEmails' => false,
//   'sendSms' => true,
//   'sendSlack' => false ]

Note: If you specify default values, any values passed to resolve() that aren't present in the defaults will generate an exception unless allowUnexpected() is called before hand:

// InvalidOptionException: "The option "sendTweet" was not expected"
$options = Options::defaults('sendEmails sendSms !sendSlack')->resolve('sendTweet');

// the 'sendTweet' option is now allowed because allowUnexpected() was called
$options = Options::defaults('sendEmails sendSms !sendSlack')->allowUnexpected()->resolve('sendTweet');

Validation

If you want to validate the given values you can pass a callback closure to validator(). Each value that is picked will be passed to your callback to check that it's valid. If it returns a false-y value, an exception will be raised.

$callback = function (string $name, $value, bool $wasExpected): bool {
    return (is_bool($value)); // ensure the value is a boolean
};

// InvalidOptionException: "The option "sendEmails" and/or it's value "yes" are not allowed"
Options::validator($callback)->defaults('sendEmails sendSms !sendSlack')->resolve('sendEmails=yes');

Chaining

The methods below may be chained together, and any of them can be called statically to instantiate an Options object:

$options = Options::allowUnexpected()->validator($callback)->defaults($defaults)->addDefaults($extraDefaults)->resolve($customValues); // chainable
$results = $options->all();

Testing

composer test

Changelog

Please see CHANGELOG for more information on what has changed recently.

SemVer

This library uses SemVer 2.0.0 versioning. This means that changes to X indicate a breaking change: 0.0.X, 0.X.y, X.y.z. When this library changes to version 1.0.0, 2.0.0 and so forth, it doesn't indicate that it's necessarily a notable release, it simply indicates that the changes were breaking.

Treeware

This package is Treeware. If you use it in production, then we ask that you buy the world a tree to thank us for our work. By contributing to the Treeware forest you’ll be creating employment for local families and restoring wildlife habitats.

Contributing

Please see CONTRIBUTING for details.

Code of Conduct

Please see CODE_OF_CONDUCT for details.

Security

If you discover any security related issues, please email tim@code-distortion.net instead of using the issue tracker.

Credits

Tim Chandler

License

The MIT License (MIT). Please see License File for more information.