================================================================================
Declare empty classes keyword in the root
================================================================================
classes

--------------------------------------------------------------------------------

(source_file
  (classes (keyword_classes))
)

================================================================================
Declare classes block with item block
================================================================================
classes: {
  foo: {
    style: {
      fill: "#44C7B1"
    }
  }
}

--------------------------------------------------------------------------------

(source_file
  (classes
    (keyword_classes)
    (block
      (class_name)
      (class_block
        (attribute
          (keyword_style)
          (block
            (attribute
              (attr_key)
              (attr_value
                (string (string_fragment))
              )
            )
          )
        )
      )
    )
  )
)

================================================================================
Declare classes block with item inline
================================================================================
classes: {
  foo.style: {
    fill: "#44C7B1"
  }
}

--------------------------------------------------------------------------------

(source_file
  (classes
    (keyword_classes)
    (block
      (class_name)
      (dot)
      (attribute
        (keyword_style)
        (block
          (attribute
            (attr_key)
            (attr_value
              (string (string_fragment))
            )
          )
        )
      )
    )
  )
)

================================================================================
Declare classes inline with item inline
================================================================================
classes.foo.style: {
  fill: "#44C7B1"
}

--------------------------------------------------------------------------------

(source_file
  (classes
    (keyword_classes)
    (dot)
    (class_name)
    (dot)
    (attribute
      (keyword_style)
      (block
        (attribute
          (attr_key)
          (attr_value
            (string (string_fragment))
          )
        )
      )
    )
  )
)

================================================================================
Declare classes inline with item block
================================================================================
classes.foo: {
  style: {
    fill: "#44C7B1"
  }
}

--------------------------------------------------------------------------------

(source_file
  (classes
    (keyword_classes)
    (dot)
    (class_name)
    (class_block
      (attribute
        (keyword_style)
        (block
          (attribute
            (attr_key)
            (attr_value
              (string (string_fragment))
            )
          )
        )
      )
    )
  )
)

================================================================================
Declare shape with a class
================================================================================
foo.class: biz

--------------------------------------------------------------------------------

(source_file
  (shape
    (shape_key)
    (dot)
    (attribute
      (keyword_class)
      (class_name)
    )
  )
)

================================================================================
Declare shape with many classes
================================================================================
foo.class: [biz; baz]

--------------------------------------------------------------------------------

(source_file
  (shape
    (shape_key)
    (dot)
    (attribute
      (keyword_class)
      (class_list
        (class_name)
        (class_name)
      )
    )
  )
)

================================================================================
Declare a class in the container
================================================================================
foo: {
  class: biz
}

--------------------------------------------------------------------------------

(source_file
  (container
    (container_key)
    (block
      (attribute
        (keyword_class)
        (class_name)
      )
    )
  )
)