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varmod-loop.mk revision 1.2 
      1 # $NetBSD: varmod-loop.mk,v 1.2 2020/08/16 12:30:45 rillig Exp $
      2 #
      3 # Tests for the :@var (a] ...${var}...@ variable modifier.
      4 
      5 all: mod-loop-varname
      6 all: mod-loop-resolve
      7 all: mod-loop-varname-dollar
      8 all: mod-loop-dollar
      9 
     10 # In the :@ modifier, the name of the loop variable can even be generated
     11 # dynamically.  There's no practical use-case for this, and hopefully nobody
     12 # will ever depend on this, but technically it's possible.
     13 # Therefore, in -dL mode, this is forbidden, see lint.mk.
     14 mod-loop-varname:
     15 	@echo :${: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
     24 	# target.
     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@}:
     29 
     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).
     33 #
     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$${RES3}
     38 RES3=		3
     39 
     40 mod-loop-resolve:
     41 	@echo $@:${RESOLVE:@v@w${v}w@:Q}:
     42 
     43 # Until 2020-07-20, the variable name of the :@ modifier could end with one
     44 # or two dollar signs, which were silently ignored.
     45 # There's no point in allowing a dollar sign in that position.
     46 mod-loop-varname-dollar:
     47 	@echo $@:${1 2 3:L:@v$@($v)@:Q}.
     48 	@echo $@:${1 2 3:L:@v$$@($v)@:Q}.
     49 	@echo $@:${1 2 3:L:@v$$$@($v)@:Q}.
     50 
     51 # Demonstrate that it is possible to generate dollar characters using the
     52 # :@ modifier.
     53 #
     54 # These are edge cases that could have resulted in a parse error as well
     55 # since the $@ at the end could have been interpreted as a variable, which
     56 # would mean a missing closing @ delimiter.
     57 mod-loop-dollar:
     58 	@echo $@:${:U1:@word@${word}$@:Q}:
     59 	@echo $@:${:U2:@word@$${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}:
     64