================================================================================
Simple connection
================================================================================
foo--bar
biz->baz
biz<->baz
biz<-baz

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

(source_file
  (connection
    (shape_key)
    (arrow)
    (shape_key)
  )
  (connection
    (shape_key)
    (arrow)
    (shape_key)
  )
  (connection
    (shape_key)
    (arrow)
    (shape_key)
  )
  (connection
    (shape_key)
    (arrow)
    (shape_key)
  )
)

================================================================================
Formatted connection
================================================================================
foo -- bar
biz -> baz
biz <-> baz
biz <- baz

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

(source_file
  (connection
    (shape_key)
    (arrow)
    (shape_key)
  )
  (connection
    (shape_key)
    (arrow)
    (shape_key)
  )
  (connection
    (shape_key)
    (arrow)
    (shape_key)
  )
  (connection
    (shape_key)
    (arrow)
    (shape_key)
  )
)

================================================================================
Connection with looooong arrow
================================================================================
foo ----------- bar
biz ----------> baz
biz <---------> baz
biz <---------- baz

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

(source_file
  (connection
    (shape_key)
    (arrow)
    (shape_key)
  )
  (connection
    (shape_key)
    (arrow)
    (shape_key)
  )
  (connection
    (shape_key)
    (arrow)
    (shape_key)
  )
  (connection
    (shape_key)
    (arrow)
    (shape_key)
  )
)


================================================================================
Complex identifier connection
================================================================================
Foo Bar -- Biz Baz
-Bar-Foo- <- -Baz-Biz-
imAShape -- im_a_shape
im_a_shape -- im$AShape
im a shape -- i'm $a shape
i'm a shape -- a-sh$ape
a-shape -- im a sh$ape
foo' 'bar -- baz

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

(source_file
  (connection (shape_key) (arrow) (shape_key))
  (connection (shape_key) (arrow) (shape_key))
  (connection (shape_key) (arrow) (shape_key))
  (connection (shape_key) (arrow) (shape_key))
  (connection (shape_key) (arrow) (shape_key))
  (connection (shape_key) (arrow) (shape_key))
  (connection (shape_key) (arrow) (shape_key))
  (connection (shape_key) (arrow) (shape_key))
)

================================================================================
Inline connection
================================================================================
foo--bar->biz->baz

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

(source_file
  (connection
    (shape_key)
    (arrow)
    (shape_key)
    (arrow)
    (shape_key)
    (arrow)
    (shape_key)
  )
)

================================================================================
Many connections inline
================================================================================
foo--bar;biz->baz

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

(source_file
  (connection
    (shape_key)
    (arrow)
    (shape_key)
  )
  (connection
    (shape_key)
    (arrow)
    (shape_key)
  )
)

================================================================================
Labeled connections
================================================================================
foo--bar: Question?
bar -> baz: Yes

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

(source_file
  (connection
    (shape_key)
    (arrow)
    (shape_key)
    (colon)
    (label)
  )
  (connection
    (shape_key)
    (arrow)
    (shape_key)
    (colon)
    (label)
  )
)

================================================================================
Connection of shapes inside a containers
================================================================================
foo.biz.baz -> bar.baz.biz: Label

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

(source_file
  (connection
    (container_key) (dot) (container_key) (dot) (shape_key)
    (arrow)
    (container_key) (dot) (container_key) (dot) (shape_key)
    (colon)
    (label)
  )
)

================================================================================
Connection of shapes inside a block of container
================================================================================
foo.baz: {
  foo -> biz: Label
}

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

(source_file
  (container
    (container_key) (dot)
    (container
      (container_key)
      (colon)
      (block
        (connection
          (shape_key)
          (arrow)
          (shape_key)
          (colon)
          (label)
        )
      )
    )
  )
)

================================================================================
Connection with espaced key fragments
================================================================================
\#(hello)- -- b\#-world

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

(source_file
  (connection
    (shape_key
      (escape_sequence)
    )
    (arrow)
    (shape_key
      (escape_sequence)
    )
  )
)


================================================================================
Diclare a connection with espaced key fragments
================================================================================
\#hello\[\] -- \[world\]

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

(source_file
  (connection
    (shape_key
      (escape_sequence)
      (escape_sequence)
      (escape_sequence)
    )
    (arrow)
    (shape_key
      (escape_sequence)
      (escape_sequence)
    )
  )
)

================================================================================
Declare a referencing connection
================================================================================
(x() -> y())
(x() -> y())[0]

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

(source_file
  (connection
    (referencing
      (shape_key)
      (arrow)
      (shape_key)
    )
  )
  (connection
    (referencing
      (shape_key)
      (arrow)
      (shape_key)
      (index (integer))
    )
  )
)

================================================================================
Declare a referencing connection with label
================================================================================
(x -> y): label
(x -> y)[0]: label

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

(source_file
  (connection
    (referencing
      (shape_key)
      (arrow)
      (shape_key)
    )
    (colon)
    (label)
  )
  (connection
    (referencing
      (shape_key)
      (arrow)
      (shape_key)
      (index (integer))
    )
    (colon)
    (label)
  )
)

================================================================================
Declare a referencing connection with block
================================================================================
(x() -> y()): {
  style.stroke: \#ff0000
}
(x -> y)[0]: {
  style.stroke: \#ff0000
}

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

(source_file
  (connection
    (referencing
      (shape_key)
      (arrow)
      (shape_key)
    )
    (colon)
    (block
      (attribute
        (keyword_style)
        (dot)
        (attribute
          (attr_key)
          (colon)
          (attr_value
            (escape_sequence)
          )
        )
      )
    )
  )
  (connection
    (referencing
      (shape_key)
      (arrow)
      (shape_key)
      (index (integer))
    )
    (colon)
    (block
      (attribute
        (keyword_style)
        (dot)
        (attribute
          (attr_key)
          (colon)
          (attr_value
            (escape_sequence)
          )
        )
      )
    )
  )
)