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Informations about the package expression-language

ExpressionLanguage Component

The ExpressionLanguage component provides an engine that can compile and evaluate expressions:

use Symfony\Component\ExpressionLanguage\ExpressionLanguage;

$language = new ExpressionLanguage();

echo $language->evaluate('1 + foo', array('foo' => 2));
// would output 3

echo $language->compile('1 + foo', array('foo'));
// would output (1 + $foo)

By default, the engine implements simple math and logic functions, method calls, property accesses, and array accesses.

You can extend your DSL with functions:

$compiler = function ($arg) {
    return sprintf('strtoupper(%s)', $arg);
};
$evaluator = function (array $variables, $value) {
    return strtoupper($value);
};
$language->register('upper', $compiler, $evaluator);

echo $language->evaluate('"foo" ~ upper(foo)', array('foo' => 'bar'));
// would output fooBAR

echo $language->compile('"foo" ~ upper(foo)');
// would output ("foo" . strtoupper($foo))

Resources

You can run the unit tests with the following command:

$ cd path/to/Symfony/Component/ExpressionLanguage/
$ composer.phar install --dev
$ phpunit

All versions of expression-language with dependencies

PHP Build Version
Package Version
Requires php Version >=5.3.9
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