77bfac719c
* 2.4: [Form][2.3] Fixes empty file-inputs getting treated as extra field. changed some PHPUnit assertions to more specific ones fixed Kernel::stripComments() normalizing new-lines added a BC comment Update FileLoader to fix issue #10339 bumped Symfony version to 2.3.12 updated VERSION for 2.3.11 update CONTRIBUTORS for 2.3.11 updated CHANGELOG for 2.3.11 Throw exception when unable to normalize embedded object Fixed evaluation of short circuit operators Follow-up to #10312: Fixed minor performance related issues in Yaml\Inline. [2.4][HttpKernel] Fix issue #10209 When the profiler has `only_exception` option activated and a subrequest throw an exception, the parent profile cannot be found. |
||
---|---|---|
.. | ||
Node | ||
ParserCache | ||
Resources/bin | ||
Tests | ||
.gitignore | ||
CHANGELOG.md | ||
Compiler.php | ||
composer.json | ||
Expression.php | ||
ExpressionLanguage.php | ||
Lexer.php | ||
LICENSE | ||
ParsedExpression.php | ||
Parser.php | ||
phpunit.xml.dist | ||
README.md | ||
SerializedParsedExpression.php | ||
SyntaxError.php | ||
Token.php | ||
TokenStream.php |
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