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* 2.6: (24 commits) [Form] fixed a maxlength overring on a guessing [Debug] Show only unique class candidates [SecurityBundle] Firewall providers building - code cleaning [Filesystem] symlink use RealPath instead LinkTarget [DependencyInjection] Remove duplicate declaration in PhpDumper terminals are not interactive on Travis Revert "[DependencyInjection] backport perf optim" [WebProfiler] Tweaked ajax requests toolbar css reset [WebProfilerBundle] replaced pattern to path attribute in routes definitions. fix phpdoc's alignment Fix missing addExpressionLanguageProvider (used by service container to add expression providers) Fixed the AuthenticationProviderInterface alignment Fixed the proxy-manager version constraint Fix missing space in label_attr fix DumpDataCollectorTest after CS changes avoid risky tests Fixed typo in SecurityContext PHPDoc [FrameworkBundle][Template name] avoid error message for the shortcut notation. [DependencyInjection] perf optim: call dirname() at most 5x [DependencyInjection] backport perf optim ... |
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.. | ||
Node | ||
ParserCache | ||
Resources/bin | ||
Tests | ||
.gitignore | ||
CHANGELOG.md | ||
Compiler.php | ||
composer.json | ||
Expression.php | ||
ExpressionFunction.php | ||
ExpressionFunctionProviderInterface.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