115 lines
4.4 KiB
Makefile
115 lines
4.4 KiB
Makefile
# $NetBSD: varmod.mk,v 1.7 2022/08/24 21:38:06 rillig Exp $
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#
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# Tests for variable modifiers, such as :Q, :S,from,to or :Ufallback.
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#
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# See also:
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# varparse-errors.mk
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# As of 2022-08-06, the possible behaviors during parsing are:
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#
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# * `strict`: the parsing style used by most modifiers:
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# * either uses `ParseModifierPart` or parses the modifier literal
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# * other modifiers may follow, separated by a ':'
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#
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# * `greedy`: calls `ParseModifierPart` with `ch->endc`; this means
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# that no further modifiers are parsed in that expression.
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#
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# * `no-colon`: after parsing this modifier, the following modifier
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# does not need to be separated by a colon.
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# Omitting this colon is bad style.
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#
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# * `individual`: parsing this modifier does not follow the common
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# pattern of calling `ParseModifierPart`.
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#
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# The SysV column says whether a parse error in the modifier falls back
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# trying the `:from=to` System V modifier.
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#
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# | **Operator** | **Behavior** | **Remarks** | **SysV** |
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# |--------------|--------------|--------------------|----------|
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# | `!` | no-colon | | no |
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# | `:=` | greedy | | yes |
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# | `?:` | greedy | | no |
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# | `@` | no-colon | | no |
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# | `C` | no-colon | | no |
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# | `D` | individual | custom parser | N/A |
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# | `E` | strict | | yes |
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# | `H` | strict | | yes |
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# | `L` | no-colon | | N/A |
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# | `M` | individual | custom parser | N/A |
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# | `N` | individual | custom parser | N/A |
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# | `O` | strict | only literal value | no |
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# | `P` | no-colon | | N/A |
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# | `Q` | strict | | yes |
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# | `R` | strict | | yes |
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# | `S` | no-colon | | N/A |
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# | `T` | strict | | N/A |
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# | `U` | individual | custom parser | N/A |
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# | `[` | strict | | no |
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# | `_` | individual | strcspn | yes |
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# | `gmtime` | strict | only literal value | yes |
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# | `hash` | strict | | N/A |
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# | `localtime` | strict | only literal value | yes |
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# | `q` | strict | | yes |
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# | `range` | strict | | N/A |
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# | `sh` | strict | | N/A |
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# | `t` | strict | | no |
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# | `u` | strict | | yes |
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# | `from=to` | greedy | SysV, fallback | N/A |
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DOLLAR1= $$
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DOLLAR2= ${:U\$}
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# To get a single '$' sign in the value of a variable expression, it has to
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# be written as '$$' in a literal variable value.
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#
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# See Var_Parse, where it calls Var_Subst.
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.if ${DOLLAR1} != "\$"
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. error
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.endif
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# Another way to get a single '$' sign is to use the :U modifier. In the
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# argument of that modifier, a '$' is escaped using the backslash instead.
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#
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# See Var_Parse, where it calls Var_Subst.
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.if ${DOLLAR2} != "\$"
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. error
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.endif
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# It is also possible to use the :U modifier directly in the expression.
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#
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# See Var_Parse, where it calls Var_Subst.
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.if ${:U\$} != "\$"
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. error
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.endif
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# XXX: As of 2020-09-13, it is not possible to use '$$' in a variable name
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# to mean a single '$'. This contradicts the manual page, which says that
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# '$' can be escaped as '$$'.
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.if ${$$:L} != ""
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. error
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.endif
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# In lint mode, make prints helpful error messages.
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# For compatibility, make does not print these error messages in normal mode.
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# Should it?
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.MAKEFLAGS: -dL
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.if ${$$:L} != ""
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. error
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.endif
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# A '$' followed by nothing is an error as well.
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.if ${:Uword:@word@${word}$@} != "word"
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. error
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.endif
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# The variable modifier :P does not fall back to the SysV modifier.
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# Therefore the modifier :P=RE generates a parse error.
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# XXX: The .error should not be reached since the variable expression is
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# malformed, and this error should be propagated up to Cond_EvalLine.
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VAR= STOP
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.if ${VAR:P=RE} != "STORE"
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. error
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.endif
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all: # nothing
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