#! /usr/bin/env ueforth

\ Copyright 2024 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.

also recognizers also internals

: ->ex   execute ;
: ->,   >r aliteral r> , ;
: ->post   >r aliteral r> postpone aliteral postpone, ;
' ->ex ' ->, ' ->post rectype: rectype-to

: prefix? { a n b m -- 0 | a' n' -1 }
  n m 1+ < if 0 exit then
  m 0 do a i + c@ b i + c@ <> if 0 unloop exit then loop
  a m + n m - -1
;

: rec-> ( a n -- )
  s" ->" prefix? 0= if rectype-none exit then
  find dup 0= if drop rectype-none exit then
  >body ['] ! rectype-to
; ' rec-> +recognizer

: rec+-> ( a n -- )
  s" +->" prefix? 0= if rectype-none exit then
  find dup 0= if drop rectype-none exit then
  >body ['] +! rectype-to
; ' rec+-> +recognizer

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