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
75all: # nothing
76