287 lines
8.9 KiB
Makefile
287 lines
8.9 KiB
Makefile
# $NetBSD: varmod-subst.mk,v 1.14 2023/12/18 11:13:51 rillig Exp $
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#
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# Tests for the :S,from,to, variable modifier.
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all: mod-subst
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all: mod-subst-delimiter
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all: mod-subst-chain
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all: mod-subst-dollar
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WORDS= sequences of letters
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# The empty pattern never matches anything, except if it is anchored at the
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# beginning or the end of the word.
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.if ${WORDS:S,,,} != ${WORDS}
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. error
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.endif
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# The :S modifier flag '1' is applied exactly once.
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.if ${WORDS:S,e,*,1} != "s*quences of letters"
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. error
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.endif
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# The :S modifier flag '1' is applied to the first occurrence, no matter if
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# the occurrence is in the first word or not.
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.if ${WORDS:S,f,*,1} != "sequences o* letters"
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. error
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.endif
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# The :S modifier replaces every first match per word.
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.if ${WORDS:S,e,*,} != "s*quences of l*tters"
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. error
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.endif
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# The :S modifier flag 'g' replaces every occurrence.
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.if ${WORDS:S,e,*,g} != "s*qu*nc*s of l*tt*rs"
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. error
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.endif
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# The '^' in the search pattern anchors the pattern at the beginning of each
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# word, thereby matching a prefix.
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.if ${WORDS:S,^sequ,occurr,} != "occurrences of letters"
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. error
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.endif
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# The :S modifier with a '^' anchor replaces the whole word if that word is
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# exactly the pattern.
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.if ${WORDS:S,^of,with,} != "sequences with letters"
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. error
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.endif
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# The :S modifier does not match if the pattern is longer than the word.
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.if ${WORDS:S,^office,does not match,} != ${WORDS}
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. warning
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.endif
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# The '$' in the search pattern anchors the pattern at the end of each word,
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# thereby matching a suffix.
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.if ${WORDS:S,f$,r,} != "sequences or letters"
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. error
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.endif
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# The :S modifier with a '$' anchor replaces at most one occurrence per word.
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.if ${WORDS:S,s$,,} != "sequence of letter"
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. error
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.endif
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# The :S modifier with a '$' anchor replaces the whole word if that word is
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# exactly the pattern.
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.if ${WORDS:S,of$,,} != "sequences letters"
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. error
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.endif
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# The :S modifier with a '$' anchor and a pattern that is longer than a word
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# cannot match that word.
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.if ${WORDS:S,eof$,,} != ${WORDS}
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. warning
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.endif
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# The :S modifier with the '^' and '$' anchors matches an exact word.
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.if ${WORDS:S,^of$,,} != "sequences letters"
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. error
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.endif
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# The :S modifier with the '^' and '$' anchors does not match a word that
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# starts with the pattern but is longer than the pattern.
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.if ${WORDS:S,^o$,,} != ${WORDS}
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. error
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.endif
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# The :S modifier with the '^' and '$' anchors does not match a word that ends
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# with the pattern but is longer than the pattern.
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.if ${WORDS:S,^f$,,} != ${WORDS}
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. error
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.endif
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# The :S modifier with the '^' and '$' anchors does not match a word if the
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# pattern ends with the word but is longer than the word.
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.if ${WORDS:S,^eof$,,} != ${WORDS}
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. error
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.endif
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# The :S modifier with the '^' and '$' anchors does not match a word if the
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# pattern starts with the word but is longer than the word.
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.if ${WORDS:S,^office$,,} != ${WORDS}
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. error
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.endif
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# Except for the '^' and '$' anchors, the pattern does not contain any special
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# characters, so the '*' from the pattern would only match a literal '*' in a
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# word.
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.if ${WORDS:S,*,replacement,} != ${WORDS}
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. error
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.endif
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# Except for the '^' and '$' anchors, the pattern does not contain any special
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# characters, so the '.' from the pattern would only match a literal '.' in a
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# word.
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.if ${WORDS:S,.,replacement,} != ${WORDS}
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. error
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.endif
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# The '&' in the replacement is a placeholder for the text matched by the
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# pattern.
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.if ${:Uvalue:S,^val,&,} != "value"
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. error
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.endif
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.if ${:Uvalue:S,ue$,&,} != "value"
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. error
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.endif
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.if ${:Uvalue:S,^val,&-&-&,} != "val-val-value"
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. error
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.endif
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.if ${:Uvalue:S,ue$,&-&-&,} != "value-ue-ue"
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. error
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.endif
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# When a word is replaced with nothing, the remaining words are separated by a
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# single space, not two.
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.if ${1 2 3:L:S,2,,} != "1 3"
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. error
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.endif
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# In an empty expression, the ':S' modifier matches a single time, but only if
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# the search string is empty and anchored at either the beginning or the end
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# of the word.
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.if ${:U:S,,out-of-nothing,} != ""
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. error
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.endif
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.if ${:U:S,^,out-of-nothing,} != "out-of-nothing"
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. error
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.endif
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.if ${:U:S,$,out-of-nothing,} != "out-of-nothing"
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. error
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.endif
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.if ${:U:S,^$,out-of-nothing,} != "out-of-nothing"
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. error
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.endif
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.if ${:U:S,,out-of-nothing,g} != ""
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. error
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.endif
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.if ${:U:S,^,out-of-nothing,g} != "out-of-nothing"
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. error
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.endif
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.if ${:U:S,$,out-of-nothing,g} != "out-of-nothing"
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. error
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.endif
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.if ${:U:S,^$,out-of-nothing,g} != "out-of-nothing"
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. error
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.endif
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.if ${:U:S,,out-of-nothing,W} != ""
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. error
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.endif
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.if ${:U:S,^,out-of-nothing,W} != "out-of-nothing"
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. error
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.endif
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.if ${:U:S,$,out-of-nothing,W} != "out-of-nothing"
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. error
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.endif
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.if ${:U:S,^$,out-of-nothing,W} != "out-of-nothing"
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. error
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.endif
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mod-subst:
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@echo $@:
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@echo :${:Ua b b c:S,a b,,:Q}:
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@echo :${:Ua b b c:S,a b,,1:Q}:
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@echo :${:Ua b b c:S,a b,,W:Q}:
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@echo :${:Ua b b c:S,b,,g:Q}:
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@echo :${:U1 2 3 1 2 3:S,1 2,___,Wg:S,_,x,:Q}:
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@echo ${:U12345:S,,sep,g:Q}
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# The :S and :C modifiers accept an arbitrary character as the delimiter,
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# including characters that are otherwise used as escape characters or
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# interpreted in a special way. This can be used to confuse humans.
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mod-subst-delimiter:
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@echo $@:
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@echo ${:U1 2 3:S 2 two :Q} horizontal tabulator
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@echo ${:U1 2 3:S 2 two :Q} space
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@echo ${:U1 2 3:S!2!two!:Q} exclamation mark
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@echo ${:U1 2 3:S"2"two":Q} quotation mark
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# In shell command lines, the hash does not need to be escaped.
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# It needs to be escaped in variable assignment lines though.
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@echo ${:U1 2 3:S#2#two#:Q} number sign
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@echo ${:U1 2 3:S$2$two$:Q} dollar sign
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@echo ${:U1 2 3:S%2%two%:Q} percent sign
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@echo ${:U1 2 3:S&2&two&:Q} ampersand
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@echo ${:U1 2 3:S'2'two':Q} apostrophe
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@echo ${:U1 2 3:S(2(two(:Q} left parenthesis
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@echo ${:U1 2 3:S)2)two):Q} right parenthesis
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@echo ${:U1 2 3:S*2*two*:Q} asterisk
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@echo ${:U1 2 3:S+2+two+:Q} plus sign
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@echo ${:U1 2 3:S,2,two,:Q} comma
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@echo ${:U1 2 3:S-2-two-:Q} hyphen-minus
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@echo ${:U1 2 3:S.2.two.:Q} full stop
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@echo ${:U1 2 3:S/2/two/:Q} solidus
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@echo ${:U1 2 3:S121two1:Q} digit
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@echo ${:U1 2 3:S:2:two::Q} colon
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@echo ${:U1 2 3:S;2;two;:Q} semicolon
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@echo ${:U1 2 3:S<2<two<:Q} less-than sign
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@echo ${:U1 2 3:S=2=two=:Q} equals sign
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@echo ${:U1 2 3:S>2>two>:Q} greater-than sign
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@echo ${:U1 2 3:S?2?two?:Q} question mark
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@echo ${:U1 2 3:S@2@two@:Q} commercial at
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@echo ${:U1 2 3:SA2AtwoA:Q} capital letter
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@echo ${:U1 2 3:S[2[two[:Q} left square bracket
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@echo ${:U1 2 3:S\2\two\:Q} reverse solidus
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@echo ${:U1 2 3:S]2]two]:Q} right square bracket
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@echo ${:U1 2 3:S^2^two^:Q} circumflex accent
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@echo ${:U1 2 3:S_2_two_:Q} low line
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@echo ${:U1 2 3:S`2`two`:Q} grave accent
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@echo ${:U1 2 3:Sa2atwoa:Q} small letter
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@echo ${:U1 2 3:S{2{two{:Q} left curly bracket
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@echo ${:U1 2 3:S|2|two|:Q} vertical line
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@echo ${:U1 2 3:S}2}two}:Q} right curly bracket
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@echo ${:U1 2 3:S~2~two~:Q} tilde
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# The :S and :C modifiers can be chained without a separating ':'.
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# This is not documented in the manual page.
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# It works because ApplyModifier_Subst scans for the known modifiers g1W
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# and then just returns to ApplyModifiers. There, the colon is optionally
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# skipped (see the *st.next == ':' at the end of the loop).
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#
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# Most other modifiers cannot be chained since their parsers skip until
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# the next ':' or '}' or ')'.
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mod-subst-chain:
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@echo $@:
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@echo ${:Ua b c:S,a,A,S,b,B,}.
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# There is no 'i' modifier for the :S or :C modifiers.
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# The error message is "make: Unknown modifier 'i'", which is
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# kind of correct, although it is mixing the terms for variable
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# modifiers with the matching modifiers.
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@echo ${:Uvalue:S,a,x,i}.
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# No matter how many dollar signs there are, they all get merged
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# into a single dollar by the :S modifier.
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#
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# As of 2020-08-09, this is because ParseModifierPart sees a '$' and
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# calls Var_Parse to expand the variable. In all other places, the "$$"
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# is handled outside of Var_Parse. Var_Parse therefore considers "$$"
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# one of the "really stupid names", skips the first dollar, and parsing
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# continues with the next character. This repeats for the other dollar
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# signs, except the one before the delimiter. That one is handled by
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# the code that optionally interprets the '$' as the end-anchor in the
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# first part of the :S modifier. That code doesn't call Var_Parse but
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# simply copies the dollar to the result.
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mod-subst-dollar:
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@echo $@:${:U1:S,^,$,:Q}:
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@echo $@:${:U2:S,^,$$,:Q}:
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@echo $@:${:U3:S,^,$$$,:Q}:
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@echo $@:${:U4:S,^,$$$$,:Q}:
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@echo $@:${:U5:S,^,$$$$$,:Q}:
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@echo $@:${:U6:S,^,$$$$$$,:Q}:
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@echo $@:${:U7:S,^,$$$$$$$,:Q}:
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@echo $@:${:U8:S,^,$$$$$$$$,:Q}:
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@echo $@:${:U40:S,^,$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$,:Q}:
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# This generates no dollar at all:
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@echo $@:${:UU8:S,^,${:U$$$$$$$$},:Q}:
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# Here is an alternative way to generate dollar signs.
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# It's unexpectedly complicated though.
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@echo $@:${:U:range=5:ts\x24:C,[0-9],,g:Q}:
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# In modifiers, dollars are escaped using the backslash, not using another
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# dollar sign. Therefore, creating a dollar sign is pretty simple:
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@echo $@:${:Ugood3:S,^,\$\$\$,:Q}
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