1# $NetBSD: varparse-mod.mk,v 1.2 2023/11/19 21:47:52 rillig Exp $
2
3# Tests for parsing expressions with modifiers.
4
5# As of 2020-10-02, the below condition does not result in a parse error.
6# The condition contains two separate mistakes.  The first mistake is that
7# the :!cmd! modifier is missing the closing '!'.  The second mistake is that
8# there is a stray '}' at the end of the whole condition.
9#
10# As of 2020-10-02, the actual parse result of this condition is a single
11# expression with 2 modifiers. The first modifier is
12# ":!echo "\$VAR"} !".  Afterwards, the parser optionally skips a ':' (at the
13# bottom of ApplyModifiers) and continues with the next modifier, in this case
14# "= "value"", which is interpreted as a SysV substitution modifier with an
15# empty left-hand side, thereby appending the string " "value"" to each word
16# of the expression.
17#
18# As of 2020-10-02, some modifiers ensure that they are followed by either a
19# ':' or the closing brace or parenthesis of the expression.  The modifiers
20# that don't ensure this are (in order of appearance in ApplyModifier):
21#	:@var@replacement@
22#	:_
23#	:L
24#	:P
25#	:!cmd!
26#	:gmtime=...
27#	:localtime=...
28#	:M (because '}' and ')' are treated the same)
29#	:N (because '}' and ')' are treated the same)
30#	:S
31#	:C
32#	:range=...
33# On the other hand, these modifiers ensure that they are followed by a
34# delimiter:
35#	:D
36#	:U
37#	:[...]
38#	:gmtime (if not followed by '=')
39#	:hash (if not followed by '=')
40#	:localtime (if not followed by '=')
41#	:t
42#	:q
43#	:Q
44#	:T
45#	:H
46#	:E
47#	:R
48#	:range (if not followed by '=')
49#	:O
50#	:u
51#	:sh
52# These modifiers don't care since they reach until the closing character
53# of the expression, which is either ')' or '}':
54#	::= (as well as the other assignment modifiers)
55#	:?
56#
57.if ${:!echo "\$VAR"} != "value"}
58.endif
59
60all:
61	@:
62