\ Copyright 2022 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. ( A WIP exploration of an optimized version of CASE. ) ( NOTE: NOT YET FUNCTIONAL ) ( TODO: complete this ) internals definitions create case-buffer 400 cells allot variable cases variable default-target variable default-fixup : case, ( n -- ) case-buffer cases @ cells + ! 1 cases +! ; forth definitions internals ( default num target fixup ) : CASE ( n -- ) 0 cases ! 0 default-target ! 0 default-fixup ! postpone ahead postpone [ ; immediate : ENDCASE postpone ] postpone then case-buffer cases @ 3 / for aft dup @ . cell+ dup @ . cell+ dup @ . cell+ cr then next drop ; immediate : OTHERWISE here default-target ! postpone ] ; immediate : OF ( n -- ) case, here case, postpone ] ; immediate : ENDOF postpone [ postpone ahead default-target @ default-fixup @ 0= and if default-fixup ! else case, then ; immediate forth definitions : test case 1 of ." one" endof 2 of ." two" endof 3 of ." three" endof otherwise ." other" endof endcase ; see test
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