[src/trunk]: src/usr.bin/make/unit-tests make(1): add test for chaining the :...

[rillig <rillig%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/bab33c47fba8
branches:  trunk
changeset: 936585:bab33c47fba8
user:      rillig <rillig%NetBSD.org@localhost>
date:      Fri Jul 31 14:36:58 2020 +0000

description:
make(1): add test for chaining the :S modifier without colon

diffstat:

 usr.bin/make/unit-tests/modmisc.exp |   2 ++
 usr.bin/make/unit-tests/modmisc.mk  |  15 ++++++++++++++-
 2 files changed, 16 insertions(+), 1 deletions(-)

diffs (48 lines):

diff -r 7c2afffd9f8c -r bab33c47fba8 usr.bin/make/unit-tests/modmisc.exp
--- a/usr.bin/make/unit-tests/modmisc.exp       Fri Jul 31 14:26:22 2020 +0000
+++ b/usr.bin/make/unit-tests/modmisc.exp       Fri Jul 31 14:36:58 2020 +0000
@@ -24,6 +24,8 @@
 :a c:
 :x__ 3 x__ 3:
 12345
+mod-subst-chain:
+A B c.
 mod-regex:
 :a b b c:
 :a b b c:
diff -r 7c2afffd9f8c -r bab33c47fba8 usr.bin/make/unit-tests/modmisc.mk
--- a/usr.bin/make/unit-tests/modmisc.mk        Fri Jul 31 14:26:22 2020 +0000
+++ b/usr.bin/make/unit-tests/modmisc.mk        Fri Jul 31 14:36:58 2020 +0000
@@ -1,4 +1,4 @@
-# $Id: modmisc.mk,v 1.29 2020/07/29 21:35:35 rillig Exp $
+# $Id: modmisc.mk,v 1.30 2020/07/31 14:36:58 rillig Exp $
 #
 # miscellaneous modifier tests
 
@@ -17,6 +17,7 @@
 
 all:   modvar modvarloop modsysv mod-HTE emptyvar undefvar
 all:   mod-subst
+all:   mod-subst-chain
 all:   mod-regex
 all:   mod-loop-varname mod-loop-resolve mod-loop-varname-dollar
 all:   mod-subst-dollar mod-loop-dollar
@@ -136,6 +137,18 @@
        @echo :${:U1 2 3 1 2 3:S,1 2,___,Wg:S,_,x,:Q}:
        @echo ${:U12345:S,,sep,g:Q}
 
+# The :S and :C modifiers can be chained without a separating ':'.
+# This is not documented in the manual page.
+# It works because ApplyModifier_Subst scans for the known modifiers g1W
+# and then just returns to ApplyModifiers.  There, the colon is optionally
+# skipped (see the *st.next == ':' at the end of the loop).
+#
+# Most other modifiers cannot be chained since their parsers skip until
+# the next ':' or '}' or ')'.
+mod-subst-chain:
+       @echo $@:
+       @echo ${:Ua b c:S,a,A,S,b,B,}.
+
 mod-regex:
        @echo $@:
        @echo :${:Ua b b c:C,a b,,:Q}: