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# $NetBSD: varmod.mk,v 1.11 2024/04/20 10:18:56 rillig Exp $
#
# Tests for variable modifiers, such as :Q, :S,from,to or :Ufallback.
#
# See also:
# varparse-errors.mk
# As of 2022-08-06, the possible behaviors during parsing are:
#
# * `strict`: the parsing style used by most modifiers:
# * either uses `ParseModifierPart` or parses the modifier literal
# * other modifiers may follow, separated by a ':'
#
# * `greedy`: calls `ParseModifierPart` with `ch->endc`; this means
# that no further modifiers are parsed in that expression.
#
# * `no-colon`: after parsing this modifier, the following modifier
# does not need to be separated by a colon.
# Omitting this colon is bad style.
#
# * `individual`: parsing this modifier does not follow the common
# pattern of calling `ParseModifierPart`.
#
# The SysV column says whether a parse error in the modifier falls back
# trying the `:from=to` System V modifier.
#
# | **Operator** | **Behavior** | **Remarks** | **SysV** |
# |--------------|--------------|--------------------|----------|
# | `!` | no-colon | | no |
# | `:=` | greedy | | yes |
# | `?:` | greedy | | no |
# | `@` | no-colon | | no |
# | `C` | no-colon | | no |
# | `D` | individual | custom parser | N/A |
# | `E` | strict | | yes |
# | `H` | strict | | yes |
# | `L` | no-colon | | N/A |
# | `M` | individual | custom parser | N/A |
# | `N` | individual | custom parser | N/A |
# | `O` | strict | only literal value | no |
# | `P` | no-colon | | N/A |
# | `Q` | strict | | yes |
# | `R` | strict | | yes |
# | `S` | no-colon | | N/A |
# | `T` | strict | | N/A |
# | `U` | individual | custom parser | N/A |
# | `[` | strict | | no |
# | `_` | individual | strcspn | yes |
# | `gmtime` | strict | only literal value | yes |
# | `hash` | strict | | N/A |
# | `localtime` | strict | only literal value | yes |
# | `q` | strict | | yes |
# | `range` | strict | | N/A |
# | `sh` | strict | | N/A |
# | `t` | strict | | no |
# | `u` | strict | | yes |
# | `from=to` | greedy | SysV, fallback | N/A |
# These tests assume
.MAKE.SAVE_DOLLARS = yes
DOLLAR1= $$
DOLLAR2= ${:U\$}
# To get a single '$' sign in the value of an expression, it has to
# be written as '$$' in a literal variable value.
#
# See Var_Parse, where it calls Var_Subst.
.if ${DOLLAR1} != "\$"
. error
.endif
# Another way to get a single '$' sign is to use the :U modifier. In the
# argument of that modifier, a '$' is escaped using the backslash instead.
#
# See Var_Parse, where it calls Var_Subst.
.if ${DOLLAR2} != "\$"
. error
.endif
# It is also possible to use the :U modifier directly in the expression.
#
# See Var_Parse, where it calls Var_Subst.
.if ${:U\$} != "\$"
. error
.endif
# XXX: As of 2020-09-13, it is not possible to use '$$' in a variable name
# to mean a single '$'. This contradicts the manual page, which says that
# '$' can be escaped as '$$'.
.if ${$$:L} != ""
. error
.endif
# In lint mode, make prints helpful error messages.
# For compatibility, make does not print these error messages in normal mode.
# Should it?
.MAKEFLAGS: -dL
# expect+2: To escape a dollar, use \$, not $$, at "$$:L} != """
# expect+1: Invalid variable name ':', at "$:L} != """
.if ${$$:L} != ""
. error
.endif
# A '$' followed by nothing is an error as well.
# expect+1: while evaluating "${:Uword:@word@${word}$@} != "word"": Dollar followed by nothing
.if ${:Uword:@word@${word}$@} != "word"
. error
.endif
# The variable modifier :P does not fall back to the SysV modifier.
# Therefore the modifier :P=RE generates a parse error.
# XXX: The .error should not be reached since the expression is
# malformed, and this error should be propagated up to Cond_EvalLine.
VAR= STOP
# expect+1: while evaluating variable "VAR": Missing delimiter ':' after modifier "P"
.if ${VAR:P=RE} != "STORE"
# expect+1: Missing argument for ".error"
. error
.endif
all: # nothing
|
