!ifndef file_is_included
!define file_is_included

Name preprocessor
OutFile preprocessor.exe

!ifdef some_define_that_doesnt_exist
this should not be executed, so no error should be raised
/*
code inside comments should not be executed
!ifdef
*/
!endif

!ifdef d1
!error "d1 is not defined!"
!else ifdef d2
!error "d2 is not defined!"
!else
# this should be compiled
!endif

!define d1

!ifdef d1
# this should be compiled
!else ifdef d2
!error "d2 is not defined!"
!else
!error "d1 is defined!"
!endif

!undef d1
!define d2

!ifdef d1
!error "d1 is not defined!"
!else ifdef d2
# this should be compiled
!else
!error "d2 is defined!"
!endif

!ifdef some_define_that_doesnt_exist
the next !endif should be part of this line\
!endif
!\
e\
n\
d\
i\
f

# tests for !if statement
!if 'test' == 'test'
 !if 1 <= 2
  !if ! 100 < 99.99
   !if 2.2 > 1.12
    !if ! 23 >= 37
     !if 1 && 1
      !if ! 0 || 0

        # this should be compiled

      !else
       !error "!if ! 0 || 0 is true!"
      !endif
     !else
      !error "!if 1 && 1 is true!"
     !endif
    !else
     !error "!if ! 23 >= 37 is true!"
    !endif
   !else
    !error "!if 2.2 > 1.12 is true!"
   !endif
  !else
   !error "!if ! 100 < 99.99 is true!"
  !endif
 !else
  !error "!if 1 <= 2 is true!"
 !endif
!else
 !error "!if 'test' == 'test' is true!"
!endif


# this should just give a warning, not an error
!include /NONFATAL file_that_doesnt_exist.nsh

# this should include this file just one time.
!include preprocessor.nsi

Section
SectionEnd

!else
# this should just give a warning, not an error
!include /NONFATAL another_file_that_doesnt_exist.nsh
!endif