114 lines
3.9 KiB
Makefile
114 lines
3.9 KiB
Makefile
# $NetBSD: directive-for-escape.mk,v 1.7 2021/02/15 07:58:19 rillig Exp $
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#
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# Test escaping of special characters in the iteration values of a .for loop.
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# These values get expanded later using the :U variable modifier, and this
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# escaping and unescaping must pass all characters and strings effectively
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# unmodified.
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.MAKEFLAGS: -df
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# Even though the .for loops take quotes into account when splitting the
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# string into words, the quotes don't need to be balanced, as of 2020-12-31.
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# This could be considered a bug.
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ASCII= !"\#$$%&'()*+,-./0-9:;<=>?@A-Z[\]_^a-z{|}~
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# XXX: As of 2020-12-31, the '#' is not preserved in the expanded body of
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# the loop since it would not need only the escaping for the :U variable
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# modifier but also the escaping for the line-end comment.
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.for chars in ${ASCII}
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. info ${chars}
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.endfor
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# As of 2020-12-31, using 2 backslashes before be '#' would treat the '#'
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# as comment character. Using 3 backslashes doesn't help either since
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# then the situation is essentially the same as with 1 backslash.
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# This means that a '#' sign cannot be passed in the value of a .for loop
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# at all.
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ASCII.2020-12-31= !"\\\#$$%&'()*+,-./0-9:;<=>?@A-Z[\]_^a-z{|}~
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.for chars in ${ASCII.2020-12-31}
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. info ${chars}
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.endfor
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# Cover the code in for_var_len.
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#
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# XXX: It is unexpected that the variable V gets expanded in the loop body.
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# The double '$$' should prevent exactly this. Probably nobody was
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# adventurous enough to use literal dollar signs in the values of a .for
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# loop.
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V= value
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VALUES= $$ $${V} $${V:=-with-modifier} $$(V) $$(V:=-with-modifier)
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.for i in ${VALUES}
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. info $i
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.endfor
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# Try to cover the code for nested '{}' in for_var_len, without success.
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#
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# The value of the variable VALUES is not meant to be a variable expression.
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# Instead, it is meant to represent literal text, the only escaping mechanism
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# being that each '$' is written as '$$'.
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#
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# The .for loop splits ${VALUES} into 3 words, at the space characters, since
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# these are not escaped.
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VALUES= $${UNDEF:U\$$\$$ {{}} end}
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# XXX: Where in the code does the '\$\$' get converted into a single '\$'?
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.for i in ${VALUES}
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. info $i
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.endfor
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# Second try to cover the code for nested '{}' in for_var_len.
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#
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# XXX: It is wrong that for_var_len requires the braces to be balanced.
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# Each variable modifier has its own inconsistent way of parsing nested
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# variable expressions, braces and parentheses. (Compare ':M', ':S', and
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# ':D' for details.) The only sensible thing to do is therefore to let
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# Var_Parse do all the parsing work.
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VALUES= begin<$${UNDEF:Ufallback:N{{{}}}}>end
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.for i in ${VALUES}
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. info $i
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.endfor
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# A single trailing dollar doesn't happen in practice.
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# The dollar sign is correctly passed through to the body of the .for loop.
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# There, it is expanded by the .info directive, but even there a trailing
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# dollar sign is kept as-is.
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.for i in ${:U\$}
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. info ${i}
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.endfor
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# As of 2020-12-31, the name of the iteration variable can even contain
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# colons, which then affects variable expressions having this exact modifier.
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# This is clearly an unintended side effect of the implementation.
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NUMBERS= one two three
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.for NUMBERS:M*e in replaced
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. info ${NUMBERS} ${NUMBERS:M*e}
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.endfor
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# As of 2020-12-31, the name of the iteration variable can contain braces,
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# which gets even more surprising than colons, since it allows to replace
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# sequences of variable expressions. There is no practical use case for
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# this, though.
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BASENAME= one
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EXT= .c
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.for BASENAME}${EXT in replaced
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. info ${BASENAME}${EXT}
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.endfor
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# Demonstrate the various ways to refer to the iteration variable.
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i= outer
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i2= two
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i,= comma
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.for i in inner
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. info . $$i: $i
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. info . $${i}: ${i}
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. info . $${i:M*}: ${i:M*}
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. info . $$(i): $(i)
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. info . $$(i:M*): $(i:M*)
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. info . $${i$${:U}}: ${i${:U}}
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. info . $${i\}}: ${i\}} # XXX: unclear why ForLoop_SubstVarLong needs this
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. info . $${i2}: ${i2}
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. info . $${i,}: ${i,}
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. info . adjacent: $i${i}${i:M*}$i
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.endfor
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all:
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