Basic directives support

[illambo]

Summary

Attempted integration of directives support, see changes in readme for use case.

TODO

• Directive location:
  • Request definitions:
    • query -> seems accessible via ResolveInfo operation->directives
    • mutation -> seems accessible via ResolveInfo operation->directives
    • subscription -> seems accessible via ResolveInfo operation->directives
    • field
    • fragment_definition
    • fragment_spread
    • inline_fragment
    • variable_definition
  • Type system definitions:
    • schema
    • scalar
    • object
    • field_definition
    • argument_definition
    • interface
    • union
    • enum
    • enum_value
    • input_object
    • input_field_definition
• Discuss if treating GraphQL directives as middleware or (better) pipeline (see interesting article) maybe in default field resolver
• Understand possible adaptation of type-modifiers
• Tests
• Unlock friendsofphp/php-cs-fixer composer dependency

DEV NOTES

• https://www.apollographql.com/docs/apollo-server/schema/creating-directives/
• underlying layer seems "unready" How to implement SchemaDirectiveVisitor like in Apollo? webonyx/graphql-php#748 Feature Request: Directive Visitors / Resolvers webonyx/graphql-php#299
• webonyx example custom directive - Examples of custom directives webonyx/graphql-php#308 (comment)
• check implementation https://github.com/diasfs/graphql-php-resolvers
• https://spec.graphql.org/June2018/#sec-Type-System.Directives

Type of change

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Checklist

• Existing tests have been adapted and/or new tests have been added
• Add a CHANGELOG.md entry
• Update the README.md
• Code style has been fixed via composer fix-style

[illambo]

I don't understand why the Code Analysis / Code Style checker (pull_request) step fails 😕

[1070rik]

Awesome feature! Would love to see this implemented :D

[mfn]

I don't understand why the Code Analysis / Code Style checker (pull_request) step fails 😕

Seems we're hit by PHP-CS-Fixer/PHP-CS-Fixer#5342 ; let's not worry about this one for now!

[illambo]

Yes, seems related to the version of package friendsofphp/php-cs-fixer, in other pr works with v2.16.8 but in this fails v2.17.1 (like u link above).
I try to lock temporarily the package version.

[illambo]

I close the pr as at the moment I don't have time to continue the implementation I hope to have more time in the future.