1# $NetBSD: varmod-loop-varname.mk,v 1.6 2023/11/19 21:47:52 rillig Exp $ 2# 3# Tests for the first part of the variable modifier ':@var@...@', which 4# contains the variable name to use during the loop. 5 6# Force the test results to be independent of the default value of this 7# setting, which is 'yes' for NetBSD's usr.bin/make but 'no' for the bmake 8# distribution and pkgsrc/devel/bmake. 9.MAKE.SAVE_DOLLARS= yes 10 11 12# Before 2021-04-04, the name of the loop variable could be generated 13# dynamically. There was no practical use-case for this. 14# Since var.c 1.907 from 2021-04-04, a '$' is no longer allowed in the 15# variable name. 16# expect+2: In the :@ modifier of "", the variable name "${:Ubar:S,b,v,}" must not contain a dollar 17# expect+1: Malformed conditional (${:Uone two three:@${:Ubar:S,b,v,}@+${var}+@} != "+one+ +two+ +three+") 18.if ${:Uone two three:@${:Ubar:S,b,v,}@+${var}+@} != "+one+ +two+ +three+" 19. error 20.else 21. error 22.endif 23 24 25# ":::" is a very creative variable name, unlikely to occur in practice. 26# The expression ${\:\:\:} would not work since backslashes can only 27# be escaped in the modifiers, but not in the variable name, therefore 28# the extra indirection via the modifier ':U'. 29.if ${:U1 2 3:@:::@x${${:U\:\:\:}}y@} != "x1y x2y x3y" 30. error 31.endif 32 33 34# "@@" is another creative variable name. 35.if ${:U1 2 3:@\@\@@x${@@}y@} != "x1y x2y x3y" 36. error 37.endif 38 39 40# In extreme cases, even the backslash can be used as variable name. 41# It needs to be doubled though. 42.if ${:U1 2 3:@\\@x${${:Ux:S,x,\\,}}y@} != "x1y x2y x3y" 43. error 44.endif 45 46 47# The variable name can technically be empty, and in this situation 48# the variable value cannot be accessed since the empty "variable" 49# is protected to always return an empty string. 50.if ${:U1 2 3:@@x${}y@} != "xy xy xy" 51. error 52.endif 53 54 55# The :@ modifier resolves the variables from the replacement text once more 56# than expected. In particular, it resolves _all_ variables from the scope, 57# and not only the loop variable (in this case v). 58SRCS= source 59CFLAGS.source= before 60ALL_CFLAGS:= ${SRCS:@src@${CFLAGS.${src}}@} # note the ':=' 61CFLAGS.source+= after 62.if ${ALL_CFLAGS} != "before" 63. error 64.endif 65 66 67# In the following example, the modifier ':@' expands the '$$' to '$'. This 68# means that when the resulting expression is evaluated, these resulting '$' 69# will be interpreted as starting a subexpression. 70# 71# The d means direct reference, the i means indirect reference. 72RESOLVE= ${RES1} $${RES1} 73RES1= 1d${RES2} 1i$${RES2} 74RES2= 2d${RES3} 2i$${RES3} 75RES3= 3 76 77.if ${RESOLVE:@v@w${v}w@} != "w1d2d3w w2i3w w1i2d3 2i\${RES3}w w1d2d3 2i\${RES3} 1i\${RES2}w" 78. error 79.endif 80 81 82# Until 2020-07-20, the variable name of the :@ modifier could end with one 83# or two dollar signs, which were silently ignored. 84# There's no point in allowing a dollar sign in that position. 85# Since var.c 1.907 from 2021-04-04, a '$' is no longer allowed in the 86# variable name. 87# expect+2: In the :@ modifier of "1 2 3", the variable name "v$" must not contain a dollar 88# expect+1: Malformed conditional (${1 2 3:L:@v$@($v)@} != "(1) (2) (3)") 89.if ${1 2 3:L:@v$@($v)@} != "(1) (2) (3)" 90. error 91.else 92. error 93.endif 94# expect+2: In the :@ modifier of "1 2 3", the variable name "v$$" must not contain a dollar 95# expect+1: Malformed conditional (${1 2 3:L:@v$$@($v)@} != "() () ()") 96.if ${1 2 3:L:@v$$@($v)@} != "() () ()" 97. error 98.else 99. error 100.endif 101# expect+2: In the :@ modifier of "1 2 3", the variable name "v$$$" must not contain a dollar 102# expect+1: Malformed conditional (${1 2 3:L:@v$$$@($v)@} != "() () ()") 103.if ${1 2 3:L:@v$$$@($v)@} != "() () ()" 104. error 105.else 106. error 107.endif 108 109 110# It may happen that there are nested :@ modifiers that use the same name for 111# for the loop variable. These modifiers influence each other. 112# 113# As of 2020-10-18, the :@ modifier is implemented by actually setting a 114# variable in the scope of the expression and deleting it again after the 115# loop. This is different from the .for loops, which substitute the 116# expression with ${:Uvalue}, leading to different unwanted side effects. 117# 118# To make the behavior more predictable, the :@ modifier should restore the 119# loop variable to the value it had before the loop. This would result in 120# the string "1a b c1 2a b c2 3a b c3", making the two loops independent. 121.if ${:U1 2 3:@i@$i${:Ua b c:@i@$i@}${i:Uu}@} != "1a b cu 2a b cu 3a b cu" 122. error 123.endif 124 125# During the loop, the variable is actually defined and nonempty. 126# If the loop were implemented in the same way as the .for loop, the variable 127# would be neither defined nor nonempty since all expressions of the form 128# ${var} would have been replaced with ${:Uword} before evaluating them. 129.if defined(var) 130. error 131.endif 132.if ${:Uword:@var@${defined(var):?def:undef} ${empty(var):?empty:nonempty}@} \ 133 != "def nonempty" 134. error 135.endif 136.if defined(var) 137. error 138.endif 139 140all: .PHONY 141