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# $NetBSD: dollar.mk,v 1.3 2020/05/17 09:37:48 rillig Exp $
#
# Test the various places where a dollar character can appear and
# see what happens. There are lots of surprises here.
#
LIST= plain 'single' "double" 'mix'"ed" back\ slashed
WORD= word
DOLLAR1= $
DOLLAR2= $$
DOLLAR4= $$$$
X= VAR_X
DOLLAR_XY= $$XY
DOLLAR_AXY= $$AXY
H= @header() { printf '\n%s\n\n' "$$*"; }; header
T= @testcase() { printf '%23s => <%s>\n' "$$@"; }; testcase
C= @comment() { printf '%s\n' "$$*"; }; comment
# These variable values are not accessed.
# The trailing dollar in the '1 dollar literal eol' test case accesses
# the empty variable instead, which is always guaranteed to be empty.
${:U }= space-var-value
${:U${.newline}}= newline-var-value
# But this one is accessed.
${:U'}= single-quote-var-value'
all:
$H 'Printing dollar from literals and variables'
$C 'To survive the parser, a dollar character must be doubled.'
$T '1 dollar literal' '$'
$T '1 dollar literal eol' ''$
$T '2 dollar literal' '$$'
$T '4 dollar literal' '$$$$'
$C 'Some hungry part of make eats all the dollars after a :U modifier.'
$T '1 dollar default' ''${:U$:Q}
$T '2 dollar default' ''${:U$$:Q}
$T '4 dollar default' ''${:U$$$$:Q}
$C 'This works as expected.'
$T '1 dollar variable' ''${DOLLAR1:Q}
$T '2 dollar variable' ''${DOLLAR2:Q}
$T '4 dollar variable' ''${DOLLAR4:Q}
$C 'Some hungry part of make eats all the dollars after a :U modifier.'
$T '1 dollar var-default' ''${:U${DOLLAR1}:Q}
$T '2 dollar var-default' ''${:U${DOLLAR2}:Q}
$T '4 dollar var-default' ''${:U${DOLLAR4}:Q}
$H 'Dollar in :S pattern'
$T 'S,$$,word,' ''${DOLLAR_XY:S,$,word,:Q}
$T 'S,$$X,word,' ''${DOLLAR_XY:S,$X,word,:Q}
$T 'S,$$$$X,word,' ''${DOLLAR_XY:S,$$X,word,:Q}
$T 'S,$$$$$$X,word,' ''${DOLLAR_XY:S,$$$X,word,:Q}
$T 'S,$$X,replaced,' ''${X:S,$X,replaced,:Q}
$T 'S,$$$$X,replaced,' ''${X:S,$$X,replaced,:Q}
$T 'S,$$$$$$X,replaced,' ''${X:S,$$$X,replaced,:Q}
$H 'Dollar in :C character class'
$C 'The A is replaced because the $$$$ is reduced to a single $$,'
$C 'which is then resolved to the variable X with the value VAR_X.'
$C 'The effective character class becomes [VAR_XY].'
$T 'C,[$$$$XY],<&>,g' ''${DOLLAR_AXY:C,[$$XY],<&>,g:Q}
$H 'Dollar in :C pattern'
$C 'For some reason, multiple dollars are folded into one.'
$T 'C,$$,dollar,g' ''${DOLLAR:C,$,dollar,g:Q}
$T 'C,$$$$,dollar,g' ''${DOLLAR:C,$$,dollar,g:Q}
$H 'Dollar in :S replacement'
$C 'For some reason, multiple dollars are folded into one.'
$T 'S,word,a$$Xo,' ''${WORD:S,word,a$Xo,:Q}
$T 'S,word,a$$$$Xo,' ''${WORD:S,word,a$$Xo,:Q}
$T 'S,word,a$$$$$$Xo,' ''${WORD:S,word,a$$$Xo,:Q}
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