100 lines
2.2 KiB
Makefile
100 lines
2.2 KiB
Makefile
# $NetBSD: cond-token-string.mk,v 1.6 2022/05/08 06:57:00 rillig Exp $
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#
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# Tests for quoted string literals in .if conditions.
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#
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# See also:
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# cond-token-plain.mk
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# Covers string literals without quotes (called "bare words").
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# TODO: Implementation
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# Cover the code in CondParser_String that frees the memory after parsing
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# a variable expression based on an undefined variable.
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.if "" != "${:Uvalue:Z}"
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. error
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.else
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. error
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.endif
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.if x${:Uvalue}
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. error
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.else
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. info xvalue is not defined.
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.endif
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# The 'x' produces a "Malformed conditional" since the left-hand side of a
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# comparison in an .if directive must be either a variable expression, a
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# quoted string literal or a number that starts with a digit.
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.if x${:Uvalue} == ""
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. error
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.else
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. error
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.endif
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# In plain words, a '\' can be used to escape any character, just as in
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# double-quoted string literals. See CondParser_String.
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.if \x${:Uvalue} == "xvalue"
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. info Expected.
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.else
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. error
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.endif
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.MAKEFLAGS: -dc
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# A string in quotes is checked whether it is not empty.
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.if "UNDEF"
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. info The string literal "UNDEF" is not empty.
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.else
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. error
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.endif
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# A space is not empty as well.
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# This differs from many other places where whitespace is trimmed.
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.if " "
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. info The string literal " " is not empty, even though it consists of $\
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whitespace only.
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.else
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. error
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.endif
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.if "${UNDEF}"
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. error
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.else
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. info An undefined variable in quotes expands to an empty string, which $\
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then evaluates to false.
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.endif
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.if "${:Uvalue}"
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. info A nonempty variable expression evaluates to true.
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.else
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. error
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.endif
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.if "${:U}"
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. error
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.else
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. info An empty variable evaluates to false.
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.endif
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# A non-empty string evaluates to true, no matter if it's a literal string or
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# if it contains variable expressions. The parentheses are not necessary for
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# the parser, in this case their only purpose is to make the code harder to
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# read for humans.
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VAR= value
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.if ("${VAR}")
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.else
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. error
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.endif
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# In the conditions in .if directives, the left-hand side of a comparison must
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# be enclosed in quotes. The right-hand side does not need to be enclosed in
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# quotes.
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.if "quoted" == quoted
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.else
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. error
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.endif
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.MAKEFLAGS: -d0
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all: .PHONY
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