%YAML 1.2
---
name: Ruby on Rails
file_extensions:
  - rxml
  - builder
scope: source.ruby.rails
contexts:
  main:
    - include: early-expressions
    - include: late-expressions
    - include: 'scope:source.ruby#expressions'

  embedded-expressions:
    - include: early-expressions
    # This is placed here to prevent the lookaheads from causing infinite recursion
    - include: scope:source.ruby
    - include: late-expressions

  early-expressions:
    # Uses negative lookahead to filter out symbols
    - match: '\b(before_(filter|action)|skip_before_(filter|action)|skip_after_(filter|action)|after_(filter|action)|around_(filter|action)|filter|filter_parameter_logging|layout|require_dependency|render|render_action|render_text|render_file|render_template|render_nothing|render_component|render_without_layout|rescue_from|url_for|redirect_to|redirect_to_path|redirect_to_url|respond_to|helper|helper_method|model|observer|serialize|scaffold|verify|hide_action|append_view_path|prepend_view_path|view_paths)(?![?!:])\b'
      scope: support.function.actionpack.rails
    # Uses negative lookahead to filter out symbols
    - match: '\b(named_scope|default_scope|scope|after_create|after_destroy|after_save|after_update|after_validation|after_validation_on_create|after_validation_on_update|before_create|before_destroy|before_save|before_update|before_validation|before_validation_on_create|before_validation_on_update|composed_of|belongs_to|has_one|has_many|has_and_belongs_to_many|validate|validate_on_create|validates_numericality_of|validate_on_update|validates_acceptance_of|validates_associated|validates_confirmation_of|validates_each|validates_format_of|validates_inclusion_of|validates_exclusion_of|validates_length_of|validates_presence_of|validates_size_of|validates_uniqueness_of|validates|attr_protected|attr_accessible|attr_readonly)(?![?!:])\b'
      scope: support.function.activerecord.rails
    - match: \b(alias_method_chain|alias_attribute|delegate|cattr_accessor|mattr_accessor|class_attribute|returning)\b
      scope: support.function.activesupport.rails

  # These expressions match the leading whitespace to properly match the correct
  # "end", but it also means they'll match before the main Ruby syntax will
  late-expressions:
    # Uses lookahead to match classes with the ControllerTest suffix
    - match: '(^\s*)(?=class\s+(([.[:alnum:]_:]+ControllerTest(\s*<\s*[.[:alnum:]_:]+)?)))'
      push:
        - meta_scope: meta.functional_test.rails
        - match: ^\1(?=end)\b
          pop: true
        - include: embedded-expressions
    # Uses lookahead to match classes with the Controller suffix
    - match: '(^\s*)(?=class\s+(([.[:alnum:]_:]+Controller\b(\s*<\s*[.[:alnum:]_:]+)?)|(<<\s*[.[:alnum:]_:]+)))(?!.+\bend\b)'
      push:
        - meta_scope: meta.controller.rails
        - match: ^\1(?=end)\b
          pop: true
        - include: embedded-expressions
    # Uses lookahead to match modules with the Helper suffix
    - match: '(^\s*)(?=module\s+((([[:upper:]]\w*::)*)[[:upper:]]\w*)Helper\b)'
      push:
        - meta_scope: meta.helper.rails
        - match: ^\1(?=end)\b
          pop: true
        - include: embedded-expressions
    # Uses lookahead to match classes that inherit from ActionMailer::Base
    - match: '(^\s*)(?=class\s+(([.[:alnum:]_:]+(\s*<\s*ActionMailer::Base\b))))'
      push:
        - meta_scope: meta.mailer.rails
        - match: ^\1(?=end)\b
          pop: true
        - include: embedded-expressions
    # Uses lookahead to match classes that (may) inherit from ActiveRecord::Base
    - match: (^\s*)(?=class\s+.+ActiveRecord::Base\b)
      push:
        - meta_scope: meta.model.rails
        - match: ^\1(?=end)\b
          pop: true
        - include: embedded-expressions
    # Uses lookahead to match classes that (may) inherit from ActiveRecord::Migration
    - match: (^\s*)(?=class\s+.+ActiveRecord::Migration\b)
      push:
        - meta_scope: meta.migration.rails
        - match: ^\1(?=end)\b
          pop: true
        - match: (^\s*)(?=change_table)\b
          push:
            - meta_content_scope: meta.migration.change_table.rails
            - match: ^\1(?=end)\b
              pop: true
            - include: embedded-expressions
        - match: (^\s*)(?=create_table)\b
          push:
            - meta_content_scope: meta.migration.create_table.rails
            - match: ^\1(?=end)\b
              pop: true
            - include: embedded-expressions
        - include: embedded-expressions
    # Uses lookahead to match classes with the Test suffix
    - match: '(^\s*)(?=class\s+(?![.[:alnum:]_:]+ControllerTest)(([.[:alnum:]_:]+Test(\s*<\s*[.[:alnum:]_:]+)?)|(<<\s*[.[:alnum:]_:]+)))'
      push:
        - meta_scope: meta.unit_test.rails
        - match: ^\1(?=end)\b
          pop: true
        - include: embedded-expressions
    - match: (^\s*)ActionController::Routing::Routes
      push:
        - meta_scope: meta.routes.rails
        - match: ^\1(?=end)\b
          pop: true
        - include: embedded-expressions