62 lines
1.8 KiB
Makefile
62 lines
1.8 KiB
Makefile
# $NetBSD: varparse-mod.mk,v 1.2 2023/11/19 21:47:52 rillig Exp $
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# Tests for parsing expressions with modifiers.
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# As of 2020-10-02, the below condition does not result in a parse error.
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# The condition contains two separate mistakes. The first mistake is that
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# the :!cmd! modifier is missing the closing '!'. The second mistake is that
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# there is a stray '}' at the end of the whole condition.
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#
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# As of 2020-10-02, the actual parse result of this condition is a single
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# expression with 2 modifiers. The first modifier is
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# ":!echo "\$VAR"} !". Afterwards, the parser optionally skips a ':' (at the
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# bottom of ApplyModifiers) and continues with the next modifier, in this case
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# "= "value"", which is interpreted as a SysV substitution modifier with an
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# empty left-hand side, thereby appending the string " "value"" to each word
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# of the expression.
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#
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# As of 2020-10-02, some modifiers ensure that they are followed by either a
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# ':' or the closing brace or parenthesis of the expression. The modifiers
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# that don't ensure this are (in order of appearance in ApplyModifier):
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# :@var@replacement@
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# :_
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# :L
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# :P
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# :!cmd!
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# :gmtime=...
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# :localtime=...
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# :M (because '}' and ')' are treated the same)
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# :N (because '}' and ')' are treated the same)
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# :S
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# :C
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# :range=...
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# On the other hand, these modifiers ensure that they are followed by a
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# delimiter:
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# :D
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# :U
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# :[...]
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# :gmtime (if not followed by '=')
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# :hash (if not followed by '=')
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# :localtime (if not followed by '=')
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# :t
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# :q
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# :Q
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# :T
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# :H
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# :E
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# :R
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# :range (if not followed by '=')
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# :O
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# :u
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# :sh
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# These modifiers don't care since they reach until the closing character
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# of the expression, which is either ')' or '}':
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# ::= (as well as the other assignment modifiers)
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# :?
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#
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.if ${:!echo "\$VAR"} != "value"}
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.endif
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all:
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@:
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