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varmod-match.mk revision 1.6 
      1 # $NetBSD: varmod-match.mk,v 1.6 2020/11/15 18:33:41 rillig Exp $
      2 #
      3 # Tests for the :M variable modifier, which filters words that match the
      4 # given pattern.
      5 #
      6 # See ApplyModifier_Match and ModifyWord_Match for the implementation.
      7 
      8 .MAKEFLAGS: -dc
      9 
     10 NUMBERS=	One Two Three Four five six seven
     11 
     12 # Only keep words that start with an uppercase letter.
     13 .if ${NUMBERS:M[A-Z]*} != "One Two Three Four"
     14 .  error
     15 .endif
     16 
     17 # Only keep words that start with a character other than an uppercase letter.
     18 .if ${NUMBERS:M[^A-Z]*} != "five six seven"
     19 .  error
     20 .endif
     21 
     22 # Only keep words that don't start with s and at the same time end with
     23 # either of [ex].
     24 #
     25 # This test case ensures that the negation from the first character class
     26 # does not propagate to the second character class.
     27 .if ${NUMBERS:M[^s]*[ex]} != "One Three five"
     28 .  error
     29 .endif
     30 
     31 # Before 2020-06-13, this expression took quite a long time in Str_Match,
     32 # calling itself 601080390 times for 16 asterisks.
     33 .if ${:U****************:M****************b}
     34 .endif
     35 
     36 # To match a dollar sign in a word, double it.
     37 #
     38 # This is different from the :S and :C variable modifiers, where a '$'
     39 # has to be escaped as '\$'.
     40 .if ${:Ua \$ sign:M*$$*} != "\$"
     41 .  error
     42 .endif
     43 
     44 # In the :M modifier, '\$' does not escape a dollar.  Instead it is
     45 # interpreted as a backslash followed by whatever expression the
     46 # '$' starts.
     47 #
     48 # This differs from the :S, :C and several other variable modifiers.
     49 ${:U*}=		asterisk
     50 .if ${:Ua \$ sign any-asterisk:M*\$*} != "any-asterisk"
     51 .  error
     52 .endif
     53 
     54 # TODO: ${VAR:M(((}}}}
     55 # TODO: ${VAR:M{{{)))}
     56 # TODO: ${VAR:M${UNBALANCED}}
     57 # TODO: ${VAR:M${:U(((\}\}\}}}
     58 
     59 all:
     60 	@:;
     61