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