================================================================================
Simple shape key
================================================================================
foo
bar

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

(source_file
  (shape_key)
  (shape_key)
)

================================================================================
Complex shape key
================================================================================
 Foo bar 
-Biz-baz-

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

(source_file
  (shape_key)
  (shape_key)
)

================================================================================
Use quoted string as a shape key
================================================================================
'foo'

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

(source_file
  (shape_key (string))
)

================================================================================
Define multiple shapes using semicolons
================================================================================
a;b;c

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

(source_file
  (shape_key)
  (shape_key)
  (shape_key)
)

================================================================================
Labeled shapes
================================================================================
a: Foo Bar
a: Foo Bar; b: Biz Baz

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

(source_file
  (shape_key) (label)
  (shape_key) (label)
  (shape_key) (label)
)

================================================================================
It should skip white spaces
================================================================================

foo

bar   :  Foo Bar;     baz

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

(source_file
  (shape_key)
  (shape_key) (label)
  (shape_key)
)

================================================================================
Shape block
================================================================================

foo: {
  bar: {
    baz: {
      biz
    }
  }
}

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

(source_file
  (shape_key)
  (block
    (shape_key)
    (block
      (shape_key)
      (block
        (shape_key)
      )
    )
  )
)

================================================================================
Aliased shape block
================================================================================

foo: Foo {
  bar: Bar {
    baz: Baz {
      biz: Biz
    }
  }
}

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

(source_file
  (shape_key) (label)
  (block
    (shape_key) (label)
    (block
      (shape_key) (label)
      (block
        (shape_key) (label)
      )
    )
  )
)