Expression Language support

[adamwojs]

Added support for Expression Language component (https://symfony.com/doc/current/components/expression_language.html)

TODO

• Impl. Parser
• Impl. Syntax Highlighter
• Impl. Syntax Highlighter settings
• Impl. Brace Matcher
• Impl. Quote Handler

Auto inject expression language into:

• \Symfony\Component\ExpressionLanguage\ExpressionLanguage::{evaluate,compile,parse}
• \Symfony\Component\ExpressionLanguage\Expression::__construct
• https://symfony.com/doc/current/routing.html#matching-expressions
•     ├ Annotation
•     ├ Attribute
•     ├ PHP
•     ├ YAML
•     └ XML
• https://symfony.com/doc/current/reference/constraints/Expression.html
•     ├ Annotation
•     ├ Attribute
•     ├ PHP
•     ├ YAML
•     └ XML
• https://symfony.com/doc/current/reference/twig_reference.html#expression
  Missing PsiLanguageInjectionHost impl. on TwigCompositeElement
• https://symfony.com/doc/current/bundles/SensioFrameworkExtraBundle/annotations/security.html#security
•     ├ Annotation
•     └ Attribute
• https://symfony.com/doc/current/bundles/SensioFrameworkExtraBundle/annotations/cache.html#http-validation-strategies
•     ├ Annotation
•     └ Attribute
• https://symfony.com/doc/current/bundles/SensioFrameworkExtraBundle/annotations/converters.html#fetch-via-an-expression
•     ├ Annotation
•     └ Attribute
• https://symfony.com/doc/current/service_container/expression_language.html
•     ├ PHP
•     ├ YAML
•     └ XML
• ...

Note for reviewers

Expression Language parser

• Implementation is mainly based on https://plugins.jetbrains.com/docs/intellij/custom-language-support-tutorial.html and is placed under fr.adrienbrault.idea.symfony2plugin.expressionLanguage package
• Expression language lexer & parser are generated from ExpressionLanguage.bnf and ExpressionLanguage.flex files as part of the plugin build process using https://github.com/JetBrains/gradle-grammar-kit-plugin
• Expression Language grammar is based on https://github.com/JetBrains/Grammar-Kit/blob/master/HOWTO.md#24-compact-expression-parsing-with-priorities

Language Injections

• Deprecated fr.adrienbrault.idea.symfony2plugin.lang.ParameterLanguageInjector in favour of fr.adrienbrault.idea.symfony2plugin.lang.StringLiteralLanguageInjector
• In compare to previous impl. StringLiteralLanguageInjector allows inject language into string literals used in various contexts: Attributes, Annotations, Constructor/Function/Method call argument, Variable assigment and also takes into account named arguments introduced in PHP 8
• Expression Language is injected into YAML/XML files by YamlLanguageInjector / XmlLanguageInjector

Links

• https://plugins.jetbrains.com/docs/intellij/custom-language-support-tutorial.html
• https://github.com/JetBrains/Grammar-Kit/blob/master/HOWTO.md#24-compact-expression-parsing-with-priorities
• https://github.com/JetBrains/gradle-grammar-kit-plugin
• https://symfony.com/doc/current/components/expression_language/syntax.html

[King2500]

I had the same idea in mind a while ago. But since it's time consuming i didn't start working on it.

Sounds good! 👍

Is it possible to (auto-)inject it inside DocTags and/or PHP8 attributes?

[adamwojs]

Thank you for feedback @King2500!

Is it possible to (auto-)inject it inside DocTags and/or PHP8 attributes?

Yes, I think it's possible. I will go through symfony documentation and try identify all possible spots before moving PR from draft to "Ready for review" state.