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