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|
\ #if FICL_WANT_LOCALS
\ ** ficl/softwords/jhlocal.fr
\ ** stack comment style local syntax...
\ { a b c | cleared -- d e }
\ variables before the "|" are initialized in reverse order
\ from the stack. Those after the "|" are zero initialized.
\ Anything between "--" and "}" is treated as comment
\ Uses locals...
\ locstate: 0 = looking for | or -- or }}
\ 1 = found |
\ 2 = found --
\ 3 = found }
\ 4 = end of line
\
\ revised 2 June 2000 - { | a -- } now works correctly
\
\ $FreeBSD$
hide
0 constant zero
: ?-- ( c-addr u -- c-addr u flag )
2dup s" --" compare 0= ;
: ?} ( c-addr u -- c-addr u flag )
2dup s" }" compare 0= ;
: ?| ( c-addr u -- c-addr u flag )
2dup s" |" compare 0= ;
\ examine name - if it's a 2local (starts with "2:"),
\ nibble the prefix (the "2:") off the name and push true.
\ Otherwise push false
\ Problem if the local is named "2:" - we fall off the end...
: ?2loc ( c-addr u -- c-addr u flag )
over dup c@ [char] 2 =
swap 1+ c@ [char] : = and
if
2 - swap char+ char+ swap \ dcs/jws: nibble the '2:'
true
else
false
endif
;
: ?delim ( c-addr u -- state | c-addr u 0 )
?| if 2drop 1 exit endif
?-- if 2drop 2 exit endif
?} if 2drop 3 exit endif
dup 0=
if 2drop 4 exit endif
0
;
set-current
: {
0 dup locals| locstate |
\ stack locals until we hit a delimiter
begin
parse-word \ ( nLocals c-addr u )
?delim dup to locstate
0= while
rot 1+ \ ( c-addr u ... c-addr u nLocals )
repeat
\ now unstack the locals
0 ?do
?2loc if (2local) else (local) endif
loop \ ( )
\ zero locals until -- or }
locstate 1 = if
begin
parse-word
?delim dup to locstate
0= while
?2loc if
postpone zero postpone zero (2local)
else
postpone zero (local)
endif
repeat
endif
0 0 (local)
\ toss words until }
\ (explicitly allow | and -- in the comment)
locstate 2 = if
begin
parse-word
?delim dup to locstate
3 < while
locstate 0= if 2drop endif
repeat
endif
locstate 3 <> abort" syntax error in { } local line"
; immediate compile-only
previous
\ #endif
|
