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cond-token-string.mk revision 1.10 
      1 # $NetBSD: cond-token-string.mk,v 1.10 2024/04/20 10:18:55 rillig Exp $
      2 #
      3 # Tests for quoted string literals in .if conditions.
      4 #
      5 # See also:
      6 #	cond-token-plain.mk
      7 #		Covers string literals without quotes (called "bare words").
      8 
      9 # TODO: Implementation
     10 
     11 # Cover the code in CondParser_String that frees the memory after parsing
     12 # an expression based on an undefined variable.
     13 # expect+2: Malformed conditional ("" != "${:Uvalue:Z}")
     14 # expect+1: while evaluating "${:Uvalue:Z}"": Unknown modifier "Z"
     15 .if "" != "${:Uvalue:Z}"
     16 .  error
     17 .else
     18 .  error
     19 .endif
     20 
     21 .if x${:Uvalue}
     22 .  error
     23 .else
     24 # expect+1: xvalue is not defined.
     25 .  info xvalue is not defined.
     26 .endif
     27 
     28 # The 'x' produces a "Malformed conditional" since the left-hand side of a
     29 # comparison in an .if directive must be either an expression, a
     30 # quoted string literal or a number that starts with a digit.
     31 # expect+1: Malformed conditional (x${:Uvalue} == "")
     32 .if x${:Uvalue} == ""
     33 .  error
     34 .else
     35 .  error
     36 .endif
     37 
     38 # In plain words, a '\' can be used to escape any character, just as in
     39 # double-quoted string literals.  See CondParser_String.
     40 .if \x${:Uvalue} == "xvalue"
     41 # expect+1: Expected.
     42 .  info Expected.
     43 .else
     44 .  error
     45 .endif
     46 
     47 .MAKEFLAGS: -dc
     48 
     49 # A string in quotes is checked whether it is not empty.
     50 .if "UNDEF"
     51 # expect+1: The string literal "UNDEF" is not empty.
     52 .  info The string literal "UNDEF" is not empty.
     53 .else
     54 .  error
     55 .endif
     56 
     57 # A space is not empty as well.
     58 # This differs from many other places where whitespace is trimmed.
     59 .if " "
     60 # expect+1: The string literal " " is not empty, even though it consists of whitespace only.
     61 .  info The string literal " " is not empty, even though it consists of $\
     62 	whitespace only.
     63 .else
     64 .  error
     65 .endif
     66 
     67 .if "${UNDEF}"
     68 .  error
     69 .else
     70 # expect+1: An undefined variable in quotes expands to an empty string, which then evaluates to false.
     71 .  info An undefined variable in quotes expands to an empty string, which $\
     72 	then evaluates to false.
     73 .endif
     74 
     75 .if "${:Uvalue}"
     76 # expect+1: A nonempty expression evaluates to true.
     77 .  info A nonempty expression evaluates to true.
     78 .else
     79 .  error
     80 .endif
     81 
     82 .if "${:U}"
     83 .  error
     84 .else
     85 # expect+1: An empty variable evaluates to false.
     86 .  info An empty variable evaluates to false.
     87 .endif
     88 
     89 # A non-empty string evaluates to true, no matter if it's a literal string or
     90 # if it contains expressions.  The parentheses are not necessary for
     91 # the parser, in this case their only purpose is to make the code harder to
     92 # read for humans.
     93 VAR=	value
     94 .if ("${VAR}")
     95 .else
     96 .  error
     97 .endif
     98 
     99 # In the conditions in .if directives, the left-hand side of a comparison must
    100 # be enclosed in quotes.  The right-hand side does not need to be enclosed in
    101 # quotes.
    102 .if "quoted" == quoted
    103 .else
    104 .  error
    105 .endif
    106 
    107 .MAKEFLAGS: -d0
    108 
    109 all: .PHONY
    110