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varmod-range.mk revision 1.8 
      1 # $NetBSD: varmod-range.mk,v 1.8 2023/06/01 20:56:35 rillig Exp $
      2 #
      3 # Tests for the :range variable modifier, which generates sequences
      4 # of integers from the given range.
      5 #
      6 # See also:
      7 #	modword.mk
      8 
      9 # The :range modifier generates a sequence of integers, one number per
     10 # word of the variable expression's value.
     11 .if ${a b c:L:range} != "1 2 3"
     12 .  error
     13 .endif
     14 
     15 # To preserve spaces in a word, they can be enclosed in quotes, just like
     16 # everywhere else.
     17 .if ${:U first "the second word" third 4 :range} != "1 2 3 4"
     18 .  error
     19 .endif
     20 
     21 # The :range modifier takes the number of words from the value of the
     22 # variable expression.  If that expression is undefined, the range is
     23 # undefined as well.  This should not come as a surprise.
     24 .if "${:range}" != ""
     25 .  error
     26 .endif
     27 
     28 # The :range modifier can be given a parameter, which makes the generated
     29 # range independent from the value or the name of the variable expression.
     30 #
     31 # XXX: As of 2020-09-27, the :range=... modifier does not turn the undefined
     32 # expression into a defined one.  This looks like an oversight.
     33 .if "${:range=5}" != ""
     34 .  error
     35 .endif
     36 
     37 # Negative ranges don't make sense.
     38 # As of 2020-11-01, they are accepted though, using up all available memory.
     39 #.if "${:range=-1}"
     40 #.  error
     41 #.else
     42 #.  error
     43 #.endif
     44 
     45 # The :range modifier requires a number as parameter.
     46 #
     47 # Until 2020-11-01, the parser tried to read the 'x' as a number, failed and
     48 # stopped there.  It then tried to parse the next modifier at that point,
     49 # which failed with the message "Unknown modifier".
     50 #
     51 # Since 2020-11-01, the parser issues a more precise "Invalid number" error
     52 # instead.
     53 # expect+2: Invalid number "x}Rest" != "Rest"" for ':range' modifier
     54 # expect+1: Malformed conditional ("${:U:range=x}Rest" != "Rest")
     55 .if "${:U:range=x}Rest" != "Rest"
     56 .  error
     57 .else
     58 .  error
     59 .endif
     60 
     61 # The upper limit of the range must always be given in decimal.
     62 # This parse error stops at the 'x', trying to parse it as a variable
     63 # modifier.
     64 # expect+2: Unknown modifier "x0"
     65 # expect+1: Malformed conditional ("${:U:range=0x0}Rest" != "Rest")
     66 .if "${:U:range=0x0}Rest" != "Rest"
     67 .  error
     68 .else
     69 .  error
     70 .endif
     71 
     72 # As of 2020-11-01, numeric overflow is not detected.
     73 # Since strtoul returns ULONG_MAX in such a case, it is interpreted as a
     74 # very large number, consuming all available memory.
     75 #.if "${:U:range=18446744073709551619}Rest" != "Rest"
     76 #.  error
     77 #.else
     78 #.  error
     79 #.endif
     80 
     81 # modifier name too short
     82 # expect+2: Unknown modifier "rang"
     83 # expect+1: Malformed conditional ("${a b c:L:rang}Rest" != "Rest")
     84 .if "${a b c:L:rang}Rest" != "Rest"
     85 .  error
     86 .else
     87 .  error
     88 .endif
     89 
     90 # misspelled modifier name
     91 # expect+2: Unknown modifier "rango"
     92 # expect+1: Malformed conditional ("${a b c:L:rango}Rest" != "Rest")
     93 .if "${a b c:L:rango}Rest" != "Rest"
     94 .  error
     95 .else
     96 .  error
     97 .endif
     98 
     99 # modifier name too long
    100 # expect+2: Unknown modifier "ranger"
    101 # expect+1: Malformed conditional ("${a b c:L:ranger}Rest" != "Rest")
    102 .if "${a b c:L:ranger}Rest" != "Rest"
    103 .  error
    104 .else
    105 .  error
    106 .endif
    107 
    108 all:
    109