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      1 # $NetBSD: cond-cmp-unary.mk,v 1.6 2023/11/19 21:47:52 rillig Exp $
      2 #
      3 # Tests for unary comparisons in .if conditions, that is, comparisons with
      4 # a single operand.  If the operand is a number, it is compared to zero,
      5 # if it is a string, it is tested for emptiness.
      6 
      7 # The number 0 in all its various representations evaluates to false.
      8 .if 0 || 0.0 || 0e0 || 0.0e0 || 0.0e10
      9 .  error
     10 .endif
     11 
     12 # Any other number evaluates to true.
     13 .if !12345
     14 .  error
     15 .endif
     16 
     17 # The empty string evaluates to false.
     18 .if ""
     19 .  error
     20 .endif
     21 
     22 # Any other string evaluates to true.
     23 .if !"0"
     24 .  error
     25 .endif
     26 
     27 # The empty string may come from an expression.
     28 #
     29 # XXX: As of 2023-06-01, this empty string is interpreted "as a number" in
     30 # EvalTruthy, which is plain wrong.  The bug is in TryParseNumber.
     31 .if ${:U}
     32 .  error
     33 .endif
     34 
     35 # An expression that is not surrounded by quotes is interpreted
     36 # as a number if possible, otherwise as a string.
     37 .if ${:U0}
     38 .  error
     39 .endif
     40 
     41 # A non-zero number from an expression evaluates to true.
     42 .if !${:U12345}
     43 .  error
     44 .endif
     45 
     46 # A string of whitespace should evaluate to false.
     47 #
     48 # XXX: As of 2023-06-01, the implementation in EvalTruthy does not skip
     49 # whitespace before testing for the end.  This was probably an oversight in
     50 # a commit from 1992-04-15 saying "A variable is empty when it just contains
     51 # spaces".
     52 .if ${:U   }
     53 # expect+1: This is only reached because of a bug in EvalTruthy.
     54 .  info This is only reached because of a bug in EvalTruthy.
     55 .else
     56 .  error
     57 .endif
     58 
     59 # The condition '${VAR:M*}' is almost equivalent to '${VAR:M*} != ""'.  The
     60 # only case where they differ is for a single word whose numeric value is zero.
     61 .if ${:U0:M*}
     62 .  error
     63 .endif
     64 .if ${:U0:M*} == ""
     65 .  error
     66 .endif
     67 # Multiple words cannot be parsed as a single number, thus evaluating to true.
     68 .if !${:U0 0:M*}
     69 .  error
     70 .endif
     71 .if ${:U0 0:M*} == ""
     72 .  error
     73 .endif
     74 
     75 all: # nothing
     76