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varmisc.mk revision 1.13 
      1 # $Id: varmisc.mk,v 1.13 2020/07/26 10:59:56 rillig Exp $
      2 #
      3 # Miscellaneous variable tests.
      4 
      5 all: unmatched_var_paren D_true U_true D_false U_false Q_lhs Q_rhs NQ_none \
      6 	strftime cmpv manok
      7 all: save-dollars
      8 
      9 unmatched_var_paren:
     10 	@echo ${foo::=foo-text}
     11 
     12 True = ${echo true >&2:L:sh}TRUE
     13 False= ${echo false >&2:L:sh}FALSE
     14 
     15 VSET= is set
     16 .undef UNDEF
     17 
     18 U_false:
     19 	@echo :U skipped when var set
     20 	@echo ${VSET:U${False}}
     21 
     22 D_false:
     23 	@echo :D skipped if var undef
     24 	@echo ${UNDEF:D${False}}
     25 
     26 U_true:
     27 	@echo :U expanded when var undef
     28 	@echo ${UNDEF:U${True}}
     29 
     30 D_true:
     31 	@echo :D expanded when var set
     32 	@echo ${VSET:D${True}}
     33 
     34 Q_lhs:
     35 	@echo :? only lhs when value true
     36 	@echo ${1:L:?${True}:${False}}
     37 
     38 Q_rhs:
     39 	@echo :? only rhs when value false
     40 	@echo ${0:L:?${True}:${False}}
     41 
     42 NQ_none:
     43 	@echo do not evaluate or expand :? if discarding
     44 	@echo ${VSET:U${1:L:?${True}:${False}}}
     45 
     46 April1= 1459494000
     47 
     48 # slightly contorted syntax to use utc via variable
     49 strftime:
     50 	@echo ${year=%Y month=%m day=%d:L:gmtime=1459494000}
     51 	@echo date=${%Y%m%d:L:${gmtime=${April1}:L}}
     52 
     53 # big jumps to handle 3 digits per step
     54 M_cmpv.units = 1 1000 1000000
     55 M_cmpv = S,., ,g:_:range:@i@+ $${_:[-$$i]} \* $${M_cmpv.units:[$$i]}@:S,^,expr 0 ,1:sh
     56 
     57 Version = 123.456.789
     58 cmpv.only = target specific vars
     59 
     60 cmpv:
     61 	@echo Version=${Version} == ${Version:${M_cmpv}}
     62 	@echo Literal=3.4.5 == ${3.4.5:L:${M_cmpv}}
     63 	@echo We have ${${.TARGET:T}.only}
     64 
     65 # catch misshandling of nested vars in .for loop
     66 MAN=
     67 MAN1= make.1
     68 .for s in 1 2
     69 .if defined(MAN$s) && !empty(MAN$s)
     70 MAN+= ${MAN$s}
     71 .endif
     72 .endfor
     73 
     74 manok:
     75 	@echo MAN=${MAN}
     76 
     77 # This is an expanded variant of the above .for loop.
     78 # Between 2020-06-28 and 2020-07-02 this paragraph generated a wrong
     79 # error message "Variable VARNAME is recursive".
     80 # When evaluating the !empty expression, the ${:U1} was not expanded and
     81 # thus resulted in the seeming definition VARNAME=${VARNAME}, which is
     82 # obviously recursive.
     83 VARNAME=	${VARNAME${:U1}}
     84 .if defined(VARNAME${:U2}) && !empty(VARNAME${:U2})
     85 .endif
     86 
     87 # begin .MAKE.SAVE_DOLLARS; see Var_Set_with_flags and s2Boolean.
     88 SD_VALUES=	0 1 2 False True false true Yes No yes no On Off ON OFF on off
     89 SD_4_DOLLARS=	$$$$
     90 
     91 .for val in ${SD_VALUES}
     92 .MAKE.SAVE_DOLLARS:=	${val}	# Must be := since a simple = has no effect.
     93 SD.${val}:=		${SD_4_DOLLARS}
     94 .endfor
     95 .MAKE.SAVE_DOLLARS:=	yes
     96 
     97 save-dollars:
     98 .for val in ${SD_VALUES}
     99 	@printf '%s: %-8s = %s\n' $@ ${val} ${SD.${val}:Q}
    100 .endfor
    101 
    102 # Appending to an undefined variable does not add a space in front.
    103 .undef APPENDED
    104 APPENDED+=	value
    105 .if ${APPENDED} != "value"
    106 .error "${APPENDED}"
    107 .endif
    108 
    109 # Appending to an empty variable adds a space between the old value
    110 # and the additional value.
    111 APPENDED=	# empty
    112 APPENDED+=	value
    113 .if ${APPENDED} != " value"
    114 .error "${APPENDED}"
    115 .endif
    116 
    117 # Appending to parameterized variables works as well.
    118 PARAM=		param
    119 VAR.${PARAM}=	1
    120 VAR.${PARAM}+=	2
    121 .if ${VAR.param} != "1 2"
    122 .error "${VAR.param}"
    123 .endif
    124 
    125 # The variable name can contain arbitrary characters.
    126 # If the expanded variable name ends in a +, this still does not influence
    127 # the parser. The assignment operator is still a simple assignment.
    128 # Therefore, there is no need to add a space between the variable name
    129 # and the assignment operator.
    130 PARAM=		+
    131 VAR.${PARAM}=	1
    132 VAR.${PARAM}+=	2
    133 .if ${VAR.+} != "1 2"
    134 .error "${VAR.+}"
    135 .endif
    136 .for param in + ! ?
    137 VAR.${param}=	${param}
    138 .endfor
    139 .if ${VAR.+} != "+" || ${VAR.!} != "!" || ${VAR.?} != "?"
    140 .error "${VAR.+}" "${VAR.!}" "${VAR.?}"
    141 .endif
    142