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varmod-range.mk revision 1.11 
      1 # $NetBSD: varmod-range.mk,v 1.11 2024/04/20 10:18:55 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 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 ${:U first "the second word" third 4 :range} != "1 2 3 4"
     18 .  error
     19 .endif
     20 
     21 # The :range modifier takes the number of words from the value of the
     22 # expression.  If that expression is undefined, the range is
     23 # undefined as well.  This should not come as a surprise.
     24 .if "${:range}" != ""
     25 .  error
     26 .endif
     27 
     28 # An empty expression results in a sequence of a single number, even though
     29 # the expression contains 0 words.
     30 .if ${:U:range} != "1"
     31 .  error
     32 .endif
     33 
     34 # The :range modifier can be given a parameter, which makes the generated
     35 # range independent from the value or the name of the expression.
     36 .if "${:range=5}" != ""
     37 .  error
     38 .endif
     39 # XXX: As of 2023-12-17, the ':range=n' modifier does not turn the undefined
     40 # expression into a defined one, even though it does not depend on the value
     41 # of the expression.  This looks like an oversight.
     42 # expect+1: Malformed conditional (${:range=5} != "")
     43 .if ${:range=5} != ""
     44 .  error
     45 .else
     46 .  error
     47 .endif
     48 
     49 # Negative ranges don't make sense.
     50 # As of 2020-11-01, they are accepted though, using up all available memory.
     51 #.if "${:range=-1}"
     52 #.  error
     53 #.else
     54 #.  error
     55 #.endif
     56 
     57 # The :range modifier requires a number as parameter.
     58 #
     59 # Until 2020-11-01, the parser tried to read the 'x' as a number, failed and
     60 # stopped there.  It then tried to parse the next modifier at that point,
     61 # which failed with the message "Unknown modifier".
     62 #
     63 # Since 2020-11-01, the parser issues a more precise "Invalid number" error
     64 # instead.
     65 # expect+2: while evaluating "${:U:range=x}Rest" != "Rest"": Invalid number "x}Rest" != "Rest"" for ':range' modifier
     66 # expect+1: Malformed conditional ("${:U:range=x}Rest" != "Rest")
     67 .if "${:U:range=x}Rest" != "Rest"
     68 .  error
     69 .else
     70 .  error
     71 .endif
     72 
     73 # The upper limit of the range must always be given in decimal.
     74 # This parse error stops at the 'x', trying to parse it as a variable
     75 # modifier.
     76 # expect+2: while evaluating "${:U:range=0x0}Rest" != "Rest"": Unknown modifier "x0"
     77 # expect+1: Malformed conditional ("${:U:range=0x0}Rest" != "Rest")
     78 .if "${:U:range=0x0}Rest" != "Rest"
     79 .  error
     80 .else
     81 .  error
     82 .endif
     83 
     84 # As of 2020-11-01, numeric overflow is not detected.
     85 # Since strtoul returns ULONG_MAX in such a case, it is interpreted as a
     86 # very large number, consuming all available memory.
     87 #.if "${:U:range=18446744073709551619}Rest" != "Rest"
     88 #.  error
     89 #.else
     90 #.  error
     91 #.endif
     92 
     93 # modifier name too short
     94 # expect+2: while evaluating variable "a b c": Unknown modifier "rang"
     95 # expect+1: Malformed conditional ("${a b c:L:rang}Rest" != "Rest")
     96 .if "${a b c:L:rang}Rest" != "Rest"
     97 .  error
     98 .else
     99 .  error
    100 .endif
    101 
    102 # misspelled modifier name
    103 # expect+2: while evaluating variable "a b c": Unknown modifier "rango"
    104 # expect+1: Malformed conditional ("${a b c:L:rango}Rest" != "Rest")
    105 .if "${a b c:L:rango}Rest" != "Rest"
    106 .  error
    107 .else
    108 .  error
    109 .endif
    110 
    111 # modifier name too long
    112 # expect+2: while evaluating variable "a b c": Unknown modifier "ranger"
    113 # expect+1: Malformed conditional ("${a b c:L:ranger}Rest" != "Rest")
    114 .if "${a b c:L:ranger}Rest" != "Rest"
    115 .  error
    116 .else
    117 .  error
    118 .endif
    119 
    120 all:
    121