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      1  1.10  rillig # $NetBSD: cond-op-not.mk,v 1.10 2025/06/28 22:39:28 rillig Exp $
      2   1.1  rillig #
      3   1.5  rillig # Tests for the ! operator in .if conditions, which negates its argument.
      4   1.1  rillig 
      5   1.3  rillig # The exclamation mark negates its operand.
      6   1.3  rillig .if !1
      7   1.4  rillig .  error
      8   1.3  rillig .endif
      9   1.3  rillig 
     10   1.3  rillig # Exclamation marks can be chained.
     11   1.3  rillig # This doesn't happen in practice though.
     12   1.3  rillig .if !!!1
     13   1.4  rillig .  error
     14   1.3  rillig .endif
     15   1.3  rillig 
     16   1.3  rillig # The ! binds more tightly than the &&.
     17   1.3  rillig .if !!0 && 1
     18   1.4  rillig .  error
     19   1.3  rillig .endif
     20   1.1  rillig 
     21   1.6  rillig # The operator '==' binds more tightly than '!'.
     22   1.6  rillig # This is unusual since most other programming languages define the precedence
     23   1.6  rillig # to be the other way round.
     24   1.5  rillig .if !${:Uexpression} == "expression"
     25   1.5  rillig .  error
     26   1.5  rillig .endif
     27   1.5  rillig 
     28   1.5  rillig .if !${:U}
     29   1.8  rillig # expect+1: Not empty evaluates to true.
     30   1.5  rillig .  info Not empty evaluates to true.
     31   1.5  rillig .else
     32   1.5  rillig .  info Not empty evaluates to false.
     33   1.5  rillig .endif
     34   1.5  rillig 
     35   1.5  rillig .if !${:U }
     36   1.5  rillig .  info Not space evaluates to true.
     37   1.5  rillig .else
     38   1.8  rillig # expect+1: Not space evaluates to false.
     39   1.5  rillig .  info Not space evaluates to false.
     40   1.5  rillig .endif
     41   1.5  rillig 
     42   1.5  rillig .if !${:U0}
     43   1.8  rillig # expect+1: Not 0 evaluates to true.
     44   1.5  rillig .  info Not 0 evaluates to true.
     45   1.5  rillig .else
     46   1.5  rillig .  info Not 0 evaluates to false.
     47   1.5  rillig .endif
     48   1.5  rillig 
     49   1.5  rillig .if !${:U1}
     50   1.5  rillig .  info Not 1 evaluates to true.
     51   1.5  rillig .else
     52   1.8  rillig # expect+1: Not 1 evaluates to false.
     53   1.5  rillig .  info Not 1 evaluates to false.
     54   1.5  rillig .endif
     55   1.5  rillig 
     56   1.5  rillig .if !${:Uword}
     57   1.5  rillig .  info Not word evaluates to true.
     58   1.5  rillig .else
     59   1.8  rillig # expect+1: Not word evaluates to false.
     60   1.5  rillig .  info Not word evaluates to false.
     61   1.5  rillig .endif
     62   1.5  rillig 
     63   1.7  rillig # A single exclamation mark is a parse error.
     64  1.10  rillig # expect+1: Malformed conditional "!"
     65   1.7  rillig .if !
     66   1.7  rillig .  error
     67   1.7  rillig .else
     68   1.7  rillig .  error
     69   1.7  rillig .endif
     70   1.7  rillig 
     71   1.1  rillig all:
     72   1.1  rillig 	@:;
     73