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Lucy

Lightweight PHP config parser with zero dependencies

Lucy requires PHP version >=7.0 <=7.3. Created on PHP 7.3.4

Content

1. Introduction
2. Installation
3. Usage
4. API reference
5. Setting up tests

1. Introduction

Lucy is a config parser similar to Symfony config component but much more lightweight (no dependencies). I created it because I haven't seen a competition tool for it so I created it. I don't think that Lucy is better than Symfony config component. I just like to have more than one solution to a single problem.

Lucy is basically a self creating linked list. When you create the entire config tree, it creates an instances of itself for every node in the array (tree) and validates that part of the tree. It does that on demand so the next node is created only when it needs to validate the next value in the tree. I haven't done any benchmarks to compare symfony config component and Lucy, but they are on their way. I hope you like it.

2. Installation

composer require mario-legenda/lucy

3. Usage

We will start with the most simple configuration array possible.

This simple code will just validate that the configuration entry is an array. If the entry is not an array, a Lucy\Exception\ConfigurationException will be thrown so if you expect an invalid value in your configuration, wrap it in a try/catch block.

So, lets expand on our example.

Here, we have a much better example. Deeply nested arrays are stepped into with the stepInto method. After that, you can validate the values that are within that array entry. We also introduced the isString and cannotBeEmpty methods. All of the public methods that Lucy has are chainable and you can use them in any order you wish.

Other methods include keyHasToExist, isNumeric, isBoolean, isEnum and isAssociativeStringArray.

There is also a stepOut method. With this method, you are going up in the tree. In our example above, previously we stepped into the configuration and database entry so we can validate the entries within them. After we are done validating the database entry, we stepOut of it, and validate the external_service by stepping into that entry.

Use stepInto and stepOut methods to traverse the tree as you wish. It is also important to say that Lucy does not know that there is a next entry to step into. Under the hood, it creates instances of itself that become the children of the Lucy object that created them. In our example, Lucy object validating the database entry is a child of the Lucy object created for the configuration entry.

Lucy also defines conditional methods. For example, isNumeric has a method isNumericIfExists. This method does exactly what it says. Only if an entry exists, this method will try to validate it.

Other methods are

Callable validation

If you would like a specific custom validation on a certain element, you can use a callable validators. Those validators accept a closure (anonymous function) and pass the node name and the current Lucy object.

If you want to apply a callback to all the subelement of a given entry, you can to that with applyToSubElements.

applyToSubElementsOfIfTheyExists is also available if you don't know if the elements will actually exist. In that case, this method will call the callback only on the elements that do exist and skip the rest.

4. API reference

Lucy::__construct(string $nodeName, array $node, Lucy $parentNode = null)

Create a new instance of Lucy. $parentNode is meant for internal Lucy purposes and is not meant to be used in client code.

If the $nodeName does not exist in $node, throws a Lucy\Exception\ConfigurationException.

Lucy::getNodeName(): string

Returns a current node name.

Lucy::stepInto(string $nodeName, string $errorMessage)

Steps into $nodeName and creates a new Lucy object to be validated on.

Accepts an optional $errorMessage that is replaced with the original error message for easier debugging.

If the $nodeName does not exist, throws a Lucy\Exception\ConfigurationException.

Lucy::stepIntoIfExists(string $nodeName)

Does the same thing as stepInto but does not throw exception if the node does not exist.

Lucy::stepOut()

Steps out of the current Lucy object and returns to the parent.

Lucy::applyCallback(string $nodeName, Closure $closure)

Applies a user defined callback to $nodeName. The callback will receive a string $nodeName and a current Lucy object if the object is an array, otherwise, it will receive the value that is the index of $nodeName

If the $nodeName does not exist, throws a Lucy\Exception\ConfigurationException.

Lucy::applyToSubElement(array $childNodes, Closure $closure)

Applies a user defined callback to all $childNodes. It receives the $nodeName of the currently traversed node and a Lucy object if the entry under it is an array, any other value otherwise.

If any of the child nodes does not exist, throws a Lucy\Configuration\ConfigurationException.

Lucy::applyToSubElementIfTheyExist(array $childNodes, Closure $closure)

Does the same thing as applyToSubElements but does not throw exception if one of the child nodes does not exist. If a child node doesn't exist, it skips it.

Lucy::keyHasToExist(string $nodeName, string $errorMessage = null)

Validates that the key $nodeName exists.

Accepts an optional $errorMessage that is replaced with the original error message for easier debugging.

If the $nodeName does not exist, throws a Lucy\Exception\ConfigurationException.

Lucy::cannotBeEmpty(string $nodeName, string $errorMessage = null)

Validates that a entry under $nodeName cannot be empty. It uses a simple empty() PHP function.

If the $nodeName does not exist, throws a Lucy\Exception\ConfigurationException.

Accepts an optional $errorMessage that is replaced with the original error message for easier debugging.

Lucy::cannotBeEmptyIfExists(string $nodeName, string $errorMessage = null)

Does the same thing as cannotBeEmpty but does not throw an exception if the $nodeName does not exist.

Lucy::isString(string $nodeName, string $errorMessage = null)

Validates that a entry under $nodeName is a string. A string is considered a string even if it is empty ''.

If the $nodeName does not exist, throws a Lucy\Exception\ConfigurationException.

Accepts an optional $errorMessage that is replaced with the original error message for easier debugging.

Lucy::isStringIfExists(string $nodeName, string $errorMessage = null)

Does the same thing as isString but it does not throw an exception if $nodeName does not exist.

Lucy::isNumeric(string $nodeName, string $errorMessage = null)

Validates that a entry under $nodeName a numeric expression. Both '7' and 7 are considered numeric. Under the hood, it uses the is_numeric PHP function.

If the $nodeName does not exist, throws a Lucy\Exception\ConfigurationException.

Accepts an optional $errorMessage that is replaced with the original error message for easier debugging.

Lucy::isNumericIfExists(string $nodeName, string $errorMessage = null)

Does the same thing as isNumeric but it does not throw an exception if $nodeName does not exist.

Lucy::isArray(string $nodeName, string $errorMessage = null)

Validates that an entry under $nodeName is an array.

If the $nodeName does not exist, throws a Lucy\Exception\ConfigurationException.

Accepts an optional $errorMessage that is replaced with the original error message for easier debugging.

Lucy::isArrayIfExists(string $nodeName, string $errorMessage = null)

Does the sam thing as isArray but does not throw an exception.

Lucy::isBoolean(string $nodeName, string $errorMessage = null)

Validates that the value under $nodeName is a boolean. Only true or false values are considered as be a valid boolean.

If the $nodeName does not exist, throws a Lucy\Exception\ConfigurationException.

Accepts an optional $errorMessage that is replaced with the original error message for easier debugging.

Lucy::isBooleanIfExists(string $nodeName, string $errorMessage = null)

Does the same thing as isBoolean but does not throw an exception if $nodeName does not exist.

Lucy::isAssociativeStringArray(string $nodeName, string $errorMessage = null)

Validates that all keys in a hashmap are strings. If any of the keys are not strings, it throws a Lucy\Exception\ConfigurationException.

If the $nodeName does not exist, throws a Lucy\Exception\ConfigurationException.

Accepts an optional $errorMessage that is replaced with the original error message for easier debugging.

Lucy::isEnum(string $nodeName, array $values, string $errorMessage = null)

Validates that values in the configuration contains at least one value from $values.

For example...

The above code check that the array under configuration contains at leas one value in the $values array.

If the $nodeName does not exist, throws a Lucy\Exception\ConfigurationException.

Accepts an optional $errorMessage that is replaced with the original error message for easier debugging.

5. Setting up tests

There are no production dependencies but there are development dependencies. After you clone this repo with [email protected]:MarioLegenda/lucy.git, run composer install. The tests are in the /tests directory