# $Id: moderrs.mk,v 1.1.1.8 2020/08/26 16:40:43 sjg Exp $
#
# various modifier error tests
VAR=TheVariable
# incase we have to change it ;-)
MOD_UNKN=Z
MOD_TERM=S,V,v
MOD_S:= ${MOD_TERM},
FIB= 1 1 2 3 5 8 13 21 34
all: modunkn modunknV varterm vartermV modtermV modloop
all: modloop-close
all: modwords
all: modexclam
all: mod-subst-delimiter
all: mod-regex-delimiter
all: mod-regex-undefined-subexpression
all: mod-ts-parse
all: mod-t-parse
all: mod-ifelse-parse
all: mod-remember-parse
all: mod-sysv-parse
modunkn:
@echo "Expect: Unknown modifier 'Z'"
@echo "VAR:Z=${VAR:Z}"
modunknV:
@echo "Expect: Unknown modifier 'Z'"
@echo "VAR:${MOD_UNKN}=${VAR:${MOD_UNKN}}"
varterm:
@echo "Expect: Unclosed variable specification for VAR"
@echo VAR:S,V,v,=${VAR:S,V,v,
vartermV:
@echo "Expect: Unclosed variable specification for VAR"
@echo VAR:${MOD_TERM},=${VAR:${MOD_S}
modtermV:
@echo "Expect: Unfinished modifier for VAR (',' missing)"
-@echo "VAR:${MOD_TERM}=${VAR:${MOD_TERM}}"
modloop:
@echo "Expect: 2 errors about missing @ delimiter"
@echo ${UNDEF:U1 2 3:@var}
@echo ${UNDEF:U1 2 3:@var@...}
@echo ${UNDEF:U1 2 3:@var@${var}@}
# The closing brace after the ${var} is part of the replacement string.
# In ParseModifierPart, braces and parentheses don't have to be balanced.
# This is contrary to the :M, :N modifiers, where both parentheses and
# braces must be balanced.
# This is also contrary to the SysV modifier, where only the actually
# used delimiter (either braces or parentheses) must be balanced.
modloop-close:
@echo $@:
@echo ${UNDEF:U1 2 3:@var@${var}}...@
@echo ${UNDEF:U1 2 3:@var@${var}}...@}
modwords:
@echo "Expect: 2 errors about missing ] delimiter"
@echo ${UNDEF:U1 2 3:[}
@echo ${UNDEF:U1 2 3:[#}
# out of bounds => empty
@echo 13=${UNDEF:U1 2 3:[13]}
# Word index out of bounds.
#
# On LP64I32, strtol returns LONG_MAX,
# which is then truncated to int (undefined behavior),
# typically resulting in -1.
# This -1 is interpreted as "the last word".
#
# On ILP32, strtol returns LONG_MAX,
# which is a large number.
# This results in a range from LONG_MAX - 1 to 3,
# which is empty.
@echo 12345=${UNDEF:U1 2 3:[123451234512345123451234512345]:S,^$,ok,:S,^3$,ok,}
modexclam:
@echo "Expect: 2 errors about missing ! delimiter"
@echo ${VARNAME:!echo}
# When the final exclamation mark is missing, there is no
# fallback to the SysV substitution modifier.
# If there were a fallback, the output would be "exclam",
# and the above would have produced an "Unknown modifier '!'".
@echo ${!:L:!=exclam}
mod-subst-delimiter:
@echo $@:
@echo ${VAR:S
@echo ${VAR:S,
@echo ${VAR:S,from
@echo ${VAR:S,from,
@echo ${VAR:S,from,to
@echo ${VAR:S,from,to,
@echo ${VAR:S,from,to,}
@echo 1: ${VAR:S
@echo 2: ${VAR:S,
@echo 3: ${VAR:S,from
@echo ${VAR:S,from,
@echo ${VAR:S,from,to
@echo ${VAR:S,from,to,
@echo ${VAR:S,from,to,}
mod-regex-delimiter:
@echo $@:
@echo ${VAR:C
@echo ${VAR:C,
@echo ${VAR:C,from
@echo ${VAR:C,from,
@echo ${VAR:C,from,to
@echo ${VAR:C,from,to,
@echo ${VAR:C,from,to,}
@echo 1: ${VAR:C
@echo 2: ${VAR:C,
@echo 3: ${VAR:C,from
@echo ${VAR:C,from,
@echo ${VAR:C,from,to
@echo ${VAR:C,from,to,
@echo ${VAR:C,from,to,}
# In regular expressions with alternatives, not all capturing groups are
# always set; some may be missing. Warn about these.
#
# Since there is no way to turn off this warning, the combination of
# alternative matches and capturing groups is not widely used.
#
# A newly added modifier 'U' such as in :C,(a.)|(b.),\1\2,U might be added
# for treating undefined capturing groups as empty, but that would create a
# syntactical ambiguity since the :S and :C modifiers are open-ended (see
# mod-subst-chain). Luckily the modifier :U does not make sense after :C,
# therefore this case does not happen in practice.
# The sub-modifier for the :C modifier would have to be chosen wisely.
mod-regex-undefined-subexpression:
@echo $@:
@echo ${FIB:C,1(.*),one\1,} # all ok
@echo ${FIB:C,1(.*)|2(.*),(\1)+(\2),:Q} # no match for subexpression
mod-ts-parse:
@echo $@:
@echo ${FIB:ts}
@echo ${FIB:ts\65} # octal 065 == U+0035 == '5'
@echo ${FIB:ts\65oct} # bad modifier
@echo ${FIB:tsxy} # modifier too long
mod-t-parse:
@echo $@:
@echo ${FIB:t
@echo ${FIB:txy}
@echo ${FIB:t}
@echo ${FIB:t:M*}
mod-ifelse-parse:
@echo $@:
@echo ${FIB:?
@echo ${FIB:?then
@echo ${FIB:?then:
@echo ${FIB:?then:else
@echo ${FIB:?then:else}
mod-remember-parse:
@echo $@:
@echo ${FIB:_} # ok
@echo ${FIB:__} # modifier name too long
mod-sysv-parse:
@echo $@:
@echo ${FIB:3
@echo ${FIB:3=
@echo ${FIB:3=x3
@echo ${FIB:3=x3} # ok
