1 # $NetBSD: varmod-loop.mk,v 1.2 2020/08/16 12:30:45 rillig Exp $
3 # Tests for the :@var@...${var}...@ variable modifier.
7 all: mod-loop-varname-dollar
10 # In the :@ modifier, the name of the loop variable can even be generated
11 # dynamically. There's no practical use-case for this, and hopefully nobody
12 # will ever depend on this, but technically it's possible.
13 # Therefore, in -dL mode, this is forbidden, see lint.mk.
15 @echo :${:Uone two three:@${:Ubar:S,b,v,}@+${var}+@:Q}:
16 # ":::" is a very creative variable name, unlikely in practice
17 # The expression ${\:\:\:} would not work since backslashes can only
18 # be escaped in the modifiers, but not in the variable name.
19 @echo :${:U1 2 3:@:::@x${${:U\:\:\:}}y@}:
20 # "@@" is another creative variable name.
21 @echo :${:U1 2 3:@\@\@@x${@@}y@}:
22 # Even "@" works as a variable name since the variable is installed
23 # in the "current" scope, which in this case is the one from the
25 @echo :$@: :${:U1 2 3:@\@@x${@}y@}: :$@:
26 # In extreme cases, even the backslash can be used as variable name.
27 # It needs to be doubled though.
28 @echo :${:U1 2 3:@\\@x${${:Ux:S,x,\\,}}y@}:
30 # The :@ modifier resolves the variables a little more often than expected.
31 # In particular, it resolves _all_ variables from the context, and not only
32 # the loop variable (in this case v).
34 # The d means direct reference, the i means indirect reference.
35 RESOLVE= ${RES1} $${RES1}
36 RES1= 1d${RES2} 1i$${RES2}
37 RES2= 2d${RES3} 2i$${RES3}
41 @echo $@:${RESOLVE:@v@w${v}w@:Q}:
43 # Until 2020-07-20, the variable name of the :@ modifier could end with one
44 # or two dollar signs, which were silently ignored.
45 # There's no point in allowing a dollar sign in that position.
46 mod-loop-varname-dollar:
47 @echo $@:${1 2 3:L:@v$@($v)@:Q}.
48 @echo $@:${1 2 3:L:@v$$@($v)@:Q}.
49 @echo $@:${1 2 3:L:@v$$$@($v)@:Q}.
51 # Demonstrate that it is possible to generate dollar characters using the
54 # These are edge cases that could have resulted in a parse error as well
55 # since the $@ at the end could have been interpreted as a variable, which
56 # would mean a missing closing @ delimiter.
58 @echo $@:${:U1:@word@${word}$@:Q}:
59 @echo $@:${:U2:@word@$${word}$$@:Q}:
60 @echo $@:${:U3:@word@$$${word}$$$@:Q}:
61 @echo $@:${:U4:@word@$$$${word}$$$$@:Q}:
62 @echo $@:${:U5:@word@$$$$${word}$$$$$@:Q}:
63 @echo $@:${:U6:@word@$$$$$${word}$$$$$$@:Q}: