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varmod-range.mk revision 1.4 
      1 # $NetBSD: varmod-range.mk,v 1.4 2020/09/27 18:11:31 rillig Exp $
      2 #
      3 # Tests for the :range variable modifier, which generates sequences
      4 # of integers from the given range.
      5 
      6 # The :range modifier generates a sequence of integers, one number per
      7 # word of the variable expression's value.
      8 .if ${a b c:L:range} != "1 2 3"
      9 .  error
     10 .endif
     11 
     12 # To preserve spaces in a word, they can be enclosed in quotes, just like
     13 # everywhere else.
     14 .if ${:U first "the second word" third 4 :range} != "1 2 3 4"
     15 .  error
     16 .endif
     17 
     18 # The :range modifier takes the number of words from the value of the
     19 # variable expression.  If that expression is undefined, the range is
     20 # undefined as well.  This should not come as a surprise.
     21 .if "${:range}" != ""
     22 .  error
     23 .endif
     24 
     25 # The :range modifier can be given a parameter, which makes the generated
     26 # range independent from the value or the name of the variable expression.
     27 #
     28 # XXX: As of 2020-09-27, the :range=... modifier does not turn the undefined
     29 # expression into a defined one.  This looks like an oversight.
     30 .if "${:range=5}" != ""
     31 .  error
     32 .endif
     33 
     34 all:
     35 	@echo ${a b c:L:rang}			# modifier name too short
     36 	@echo ${a b c:L:range}			# ok
     37 	@echo ${a b c:L:rango}			# misspelled
     38 	@echo ${a b c:L:ranger}			# modifier name too long
     39