\ Copyright 2021 Bradley D. Nelson \ \ Licensed under the Apache License, Version 2.0 (the "License"); \ you may not use this file except in compliance with the License. \ You may obtain a copy of the License at \ \ http://www.apache.org/licenses/LICENSE-2.0 \ \ Unless required by applicable law or agreed to in writing, software \ distributed under the License is distributed on an "AS IS" BASIS, \ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. \ See the License for the specific language governing permissions and \ limitations under the License. ( Interpret time conditionals ) : DEFINED? ( "name" -- xt|0 ) begin bl parse dup 0= while 2drop refill 0= throw repeat find state @ if aliteral then ; immediate defer [SKIP] : [THEN] ; immediate : [ELSE] [SKIP] ; immediate : [IF] 0= if [SKIP] then ; immediate : [SKIP]' 0 begin postpone defined? dup if dup ['] [IF] = if swap 1+ swap then dup ['] [ELSE] = if swap dup 0 <= if 2drop exit then swap then dup ['] [THEN] = if swap 1- dup 0< if 2drop exit then swap then then drop again ; ' [SKIP]' is [SKIP]
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