====================
Empty if [condition]
====================
if ( cond )
endif()

---

(source_file
  (if_condition
    (if_command
      (if)
      (argument_list
        (argument (unquoted_argument))
      )
    )
    (body)
    (endif_command (endif))
  )
)

===========================
Empty if elseif [condition]
===========================
if(cond)
elseif(cond)
endif()

---

(source_file
  (if_condition
    (if_command
      (if)
      (argument_list
        (argument (unquoted_argument))
      )
    )
    (body)
    (elseif_command
      (elseif)
      (argument_list
        (argument (unquoted_argument))
      )
    )
    (body)
    (endif_command (endif))
  )
)

================================
Empty if elseif else [condition]
================================
if(cond)
elseif(cond)
else()
endif()

---

(source_file
  (if_condition
    (if_command
      (if)
      (argument_list
        (argument (unquoted_argument))
      )
    )
    (body)
    (elseif_command
      (elseif)
      (argument_list
        (argument (unquoted_argument))
      )
    )
    (body)
    (else_command (else))
    (body)
    (endif_command (endif))
  )
)

============================================
If with many command invocations [condition]
============================================
if(cond)
  message(STATUS)
  message(STATUS)
endif()

---

(source_file
  (if_condition
    (if_command
      (if)
        (argument_list
          (argument (unquoted_argument))
        )
    )
    (body
      (normal_command
        (identifier)
        (argument_list
          (argument (unquoted_argument))
        )
      )
      (normal_command
        (identifier)
        (argument_list
          (argument (unquoted_argument))
        )
      )
    )
    (endif_command (endif))
  )
)

==============================================================
If, elseof, and else with many command invocations [condition]
==============================================================
if(cond)
  message(STATUS)
  message(STATUS)
elseif(cond)
  message(STATUS)
  message(STATUS)
else(cond)
  message(STATUS)
  message(STATUS)
endif()

---

(source_file
  (if_condition
    (if_command
      (if)
      (argument_list
        (argument (unquoted_argument))
      )
    )
    (body
      (normal_command
        (identifier)
        (argument_list
          (argument (unquoted_argument))
        )
      )
      (normal_command
        (identifier)
        (argument_list
          (argument (unquoted_argument))
        )
      )
    )
    (elseif_command
    (elseif)
    (argument_list
      (argument (unquoted_argument))
    )
    )
    (body
      (normal_command
        (identifier)
        (argument_list
          (argument (unquoted_argument))
        )
      )
      (normal_command
        (identifier)
        (argument_list
          (argument (unquoted_argument))
        )
      )
    )
    (else_command
    (else)
    (argument_list
      (argument (unquoted_argument))
    )
    )
    (body
      (normal_command
        (identifier)
        (argument_list
          (argument (unquoted_argument))
        )
      )
      (normal_command
        (identifier)
        (argument_list
          (argument (unquoted_argument))
        )
      )
    )
    (endif_command (endif))
  )
)


======================================
Condition with parentheses [condition]
======================================
if((A AND B) OR C)
endif()
---
(source_file
 (if_condition
  (if_command
   (if)
   (argument_list
     (argument (unquoted_argument))
     (argument (unquoted_argument))
     (argument (unquoted_argument))
     (argument (unquoted_argument))
     (argument (unquoted_argument))
   )
  )
  (body)
  (endif_command (endif))
 )
)

==============================================
Condition with not and parentheses [condition]
==============================================
if(NOT (A AND B) OR C)
else(NOT (A AND B) OR C)
endif(NOT (A AND B) OR C)
---
(source_file
  (if_condition
    (if_command
      (if)
      (argument_list
        (argument (unquoted_argument))
        (argument (unquoted_argument))
        (argument (unquoted_argument))
        (argument (unquoted_argument))
        (argument (unquoted_argument))
        (argument (unquoted_argument))
      )
    )
    (body)
    (else_command
      (else)
      (argument_list
        (argument (unquoted_argument))
        (argument (unquoted_argument))
        (argument (unquoted_argument))
        (argument (unquoted_argument))
        (argument (unquoted_argument))
        (argument (unquoted_argument))
      )
    )
    (body)
    (endif_command
      (endif)
      (argument_list
        (argument (unquoted_argument))
        (argument (unquoted_argument))
        (argument (unquoted_argument))
        (argument (unquoted_argument))
        (argument (unquoted_argument))
        (argument (unquoted_argument))
      )
    )
  )
)

============================
Nested condition [condition]
============================
if(A)
  if(A)
  endif()
endif()

---

(source_file
  (if_condition
    (if_command
      (if)
      (argument_list
        (argument (unquoted_argument))
      )
    )
    (body
      (if_condition
        (if_command
          (if)
          (argument_list
            (argument (unquoted_argument))
          )
        )
        (body)
        (endif_command (endif))
      )
    )
    (endif_command (endif))
  )
)