1 # $NetBSD: varmod-subst.mk,v 1.7 2020/11/15 20:20:58 rillig Exp $
3 # Tests for the :S,from,to, variable modifier.
6 all: mod-subst-delimiter
10 WORDS= sequences of letters
12 .if ${WORDS:S,,,} != ${WORDS}
13 . warning The empty pattern matches something.
16 .if ${WORDS:S,e,*,1} != "s*quences of letters"
17 . warning The :S modifier flag '1' is not applied exactly once.
20 .if ${WORDS:S,f,*,1} != "sequences o* letters"
21 . warning The :S modifier flag '1' is only applied to the first word,\
22 not to the first occurrence.
25 .if ${WORDS:S,e,*,} != "s*quences of l*tters"
26 . warning The :S modifier does not replace every first match per word.
29 .if ${WORDS:S,e,*,g} != "s*qu*nc*s of l*tt*rs"
30 . warning The :S modifier flag 'g' does not replace every occurrence.
33 .if ${WORDS:S,^sequ,occurr,} != "occurrences of letters"
34 . warning The :S modifier fails for a short match anchored at the start.
37 .if ${WORDS:S,^of,with,} != "sequences with letters"
38 . warning The :S modifier fails for an exact match anchored at the start.
41 .if ${WORDS:S,^office,does not match,} != ${WORDS}
42 . warning The :S modifier matches a too long pattern anchored at the start.
45 .if ${WORDS:S,f$,r,} != "sequences or letters"
46 . warning The :S modifier fails for a short match anchored at the end.
49 .if ${WORDS:S,s$,,} != "sequence of letter"
50 . warning The :S modifier fails to replace one occurrence per word.
53 .if ${WORDS:S,of$,,} != "sequences letters"
54 . warning The :S modifier fails for an exact match anchored at the end.
57 .if ${WORDS:S,eof$,,} != ${WORDS}
58 . warning The :S modifier matches a too long pattern anchored at the end.
61 .if ${WORDS:S,^of$,,} != "sequences letters"
62 . warning The :S modifier does not match a word anchored at both ends.
65 .if ${WORDS:S,^o$,,} != ${WORDS}
66 . warning The :S modifier matches a prefix anchored at both ends.
69 .if ${WORDS:S,^f$,,} != ${WORDS}
70 . warning The :S modifier matches a suffix anchored at both ends.
73 .if ${WORDS:S,^eof$,,} != ${WORDS}
74 . warning The :S modifier matches a too long prefix anchored at both ends.
77 .if ${WORDS:S,^office$,,} != ${WORDS}
78 . warning The :S modifier matches a too long suffix anchored at both ends.
83 @echo :${:Ua b b c:S,a b,,:Q}:
84 @echo :${:Ua b b c:S,a b,,1:Q}:
85 @echo :${:Ua b b c:S,a b,,W:Q}:
86 @echo :${:Ua b b c:S,b,,g:Q}:
87 @echo :${:U1 2 3 1 2 3:S,1 2,___,Wg:S,_,x,:Q}:
88 @echo ${:U12345:S,,sep,g:Q}
90 # The :S and :C modifiers accept an arbitrary character as the delimiter,
91 # including characters that are otherwise used as escape characters or
92 # interpreted in a special way. This can be used to confuse humans.
95 @echo ${:U1 2 3:S 2 two :Q} horizontal tabulator
96 @echo ${:U1 2 3:S 2 two :Q} space
97 @echo ${:U1 2 3:S!2!two!:Q} exclamation mark
98 @echo ${:U1 2 3:S"2"two":Q} quotation mark
99 # In shell command lines, the hash does not need to be escaped.
100 # It needs to be escaped in variable assignment lines though.
101 @echo ${:U1 2 3:S#2#two#:Q} number sign
102 @echo ${:U1 2 3:S$2$two$:Q} dollar sign
103 @echo ${:U1 2 3:S%2%two%:Q} percent sign
104 @echo ${:U1 2 3:S&2&two&:Q} ampersand
105 @echo ${:U1 2 3:S'2'two':Q} apostrophe
106 @echo ${:U1 2 3:S(2(two(:Q} left parenthesis
107 @echo ${:U1 2 3:S)2)two):Q} right parenthesis
108 @echo ${:U1 2 3:S*2*two*:Q} asterisk
109 @echo ${:U1 2 3:S+2+two+:Q} plus sign
110 @echo ${:U1 2 3:S,2,two,:Q} comma
111 @echo ${:U1 2 3:S-2-two-:Q} hyphen-minus
112 @echo ${:U1 2 3:S.2.two.:Q} full stop
113 @echo ${:U1 2 3:S/2/two/:Q} solidus
114 @echo ${:U1 2 3:S121two1:Q} digit
115 @echo ${:U1 2 3:S:2:two::Q} colon
116 @echo ${:U1 2 3:S;2;two;:Q} semicolon
117 @echo ${:U1 2 3:S<2<two<:Q} less-than sign
118 @echo ${:U1 2 3:S=2=two=:Q} equals sign
119 @echo ${:U1 2 3:S>2>two>:Q} greater-than sign
120 @echo ${:U1 2 3:S?2?two?:Q} question mark
121 @echo ${:U1 2 3:S@2@two@:Q} commercial at
122 @echo ${:U1 2 3:SA2AtwoA:Q} capital letter
123 @echo ${:U1 2 3:S[2[two[:Q} left square bracket
124 @echo ${:U1 2 3:S\2\two\:Q} reverse solidus
125 @echo ${:U1 2 3:S]2]two]:Q} right square bracket
126 @echo ${:U1 2 3:S^2^two^:Q} circumflex accent
127 @echo ${:U1 2 3:S_2_two_:Q} low line
128 @echo ${:U1 2 3:S`2`two`:Q} grave accent
129 @echo ${:U1 2 3:Sa2atwoa:Q} small letter
130 @echo ${:U1 2 3:S{2{two{:Q} left curly bracket
131 @echo ${:U1 2 3:S|2|two|:Q} vertical line
132 @echo ${:U1 2 3:S}2}two}:Q} right curly bracket
133 @echo ${:U1 2 3:S~2~two~:Q} tilde
135 # The :S and :C modifiers can be chained without a separating ':'.
136 # This is not documented in the manual page.
137 # It works because ApplyModifier_Subst scans for the known modifiers g1W
138 # and then just returns to ApplyModifiers. There, the colon is optionally
139 # skipped (see the *st.next == ':' at the end of the loop).
141 # Most other modifiers cannot be chained since their parsers skip until
142 # the next ':' or '}' or ')'.
145 @echo ${:Ua b c:S,a,A,S,b,B,}.
146 # There is no 'i' modifier for the :S or :C modifiers.
147 # The error message is "make: Unknown modifier 'i'", which is
148 # kind of correct, although it is mixing the terms for variable
149 # modifiers with the matching modifiers.
150 @echo ${:Uvalue:S,a,x,i}.
152 # No matter how many dollar signs there are, they all get merged
153 # into a single dollar by the :S modifier.
155 # As of 2020-08-09, this is because ParseModifierPart sees a '$' and
156 # calls Var_Parse to expand the variable. In all other places, the "$$"
157 # is handled outside of Var_Parse. Var_Parse therefore considers "$$"
158 # one of the "really stupid names", skips the first dollar, and parsing
159 # continues with the next character. This repeats for the other dollar
160 # signs, except the one before the delimiter. That one is handled by
161 # the code that optionally interprets the '$' as the end-anchor in the
162 # first part of the :S modifier. That code doesn't call Var_Parse but
163 # simply copies the dollar to the result.
165 @echo $@:${:U1:S,^,$,:Q}:
166 @echo $@:${:U2:S,^,$$,:Q}:
167 @echo $@:${:U3:S,^,$$$,:Q}:
168 @echo $@:${:U4:S,^,$$$$,:Q}:
169 @echo $@:${:U5:S,^,$$$$$,:Q}:
170 @echo $@:${:U6:S,^,$$$$$$,:Q}:
171 @echo $@:${:U7:S,^,$$$$$$$,:Q}:
172 @echo $@:${:U8:S,^,$$$$$$$$,:Q}:
173 @echo $@:${:U40:S,^,$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$,:Q}:
174 # This generates no dollar at all:
175 @echo $@:${:UU8:S,^,${:U$$$$$$$$},:Q}:
176 # Here is an alternative way to generate dollar signs.
177 # It's unexpectedly complicated though.
178 @echo $@:${:U:range=5:ts\x24:C,[0-9],,g:Q}:
179 # In modifiers, dollars are escaped using the backslash, not using another
180 # dollar sign. Therefore, creating a dollar sign is pretty simple:
181 @echo $@:${:Ugood3:S,^,\$\$\$,:Q}