File: scfg.scm

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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;                                                                       ;;
;;;                Centre for Speech Technology Research                  ;;
;;;                     University of Edinburgh, UK                       ;;
;;;                       Copyright (c) 1996,1997                         ;;
;;;                        All Rights Reserved.                           ;;
;;;                                                                       ;;
;;;  Permission is hereby granted, free of charge, to use and distribute  ;;
;;;  this software and its documentation without restriction, including   ;;
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;;;  distribute, sublicense, and/or sell copies of this work, and to      ;;
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;;;  the following conditions:                                            ;;
;;;   1. The code must retain the above copyright notice, this list of    ;;
;;;      conditions and the following disclaimer.                         ;;
;;;   2. Any modifications must be clearly marked as such.                ;;
;;;   3. Original authors' names are not deleted.                         ;;
;;;   4. The authors' names are not used to endorse or promote products   ;;
;;;      derived from this software without specific prior written        ;;
;;;      permission.                                                      ;;
;;;                                                                       ;;
;;;  THE UNIVERSITY OF EDINBURGH AND THE CONTRIBUTORS TO THIS WORK        ;;
;;;  DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING      ;;
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;;;  FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES    ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;;  Some functions for manipulating a SCFG parse tree

(require_module 'parser)

(define (scfg_simplify tree)
  "(scfg_brackets_only tree)
Output only the bracketing and the bottom level pos and words."
  (cond
   ((not tree) nil)
   ((car (cdr (assoc 'pos (car (cdr (car tree))))))
    ;; terminal node
    (list
     (car (cdr (assoc 'pos (car (cdr (car tree))))))
     (car (car tree))))
   (t
    (cons
     (car (car tree))
     (mapcar scfg_simplify (cdr tree))))))

(define (scfg_simplify_relation_tree trees)
  (mapcar scfg_simplify trees))

(defvar scfg_eos_tree eou_tree
  "scfg_eos_tree
In MultiProbParse this CART tree is used to define end of sentence
within an utterance.  It is applied to the token relation.  
By default it is set to eou_tree.")
       
(provide 'scfg)