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Delete trailing whitespace. In lambda-list-parsing.lisp this fixes a bug
Annotate for file /lib-dependent/cl-ppcre-template.lisp
2004-11-17 mantoniotti
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;;;; -*- Mode: Lisp -*-
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;;;; cl-ppcre-template.lisp --
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;;;; REGEXP template dependent on CL-PPCRE.
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(in-package "CL.EXT.DACF.UNIFICATION") ; DACF = Data And Control Flow.
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;;;; REGEXP Templates.
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;;;; Another extension of the type specifier language.
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;;;; A template can also be
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;;;;
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;;;; <template> ::= #| templates from template-hierarchy.lisp |#
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;;;; | <regexp template>
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;;;;
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;;;; Hairier REGEXP template spec syntax:
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;;;;
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;;;; (regexp|regular-expression) <REGEXP> &optional <unification vars> &rest <keys>
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;;;;
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;;;; where
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;;;;
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;;;; <REGEXP> ::= <a CL-PPCRE regexp string or tree>
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;;;; <unification vars> ::= '(' <variable>* ')'
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;;;; <keys> ::= <CL-PPCRE (constant) keys to be passed to CL-PPCRE:CREATE-SCANNER>
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(defclass regular-expression-template (string-template)
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((scanner :reader scanner)
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(regexp :reader regular-expression)
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(vars :reader variables
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:reader registers
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:type list)
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)
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(:documentation "The Regular Expression Template.
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A template for matching strings using regular expressions.
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The actual matching is done thankes to the CL-PPCRE library.")
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)
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(defgeneric regular-expression-template-p (x)
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(:method ((x regular-expression-template)) t)
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(:method ((x t)) nil))
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(defmethod make-template ((kind (eql 'regexp)) (spec cons))
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(make-instance 'regular-expression-template :spec spec))
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(defmethod make-template ((kind (eql 'regular-expression)) (spec cons))
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(make-template 'regexp spec))
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(defmethod initialize-instance :after ((re-t regular-expression-template) &key)
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(destructuring-bind (re-kwd regexp &optional vars &rest keys)
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(template-spec re-t)
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(declare (ignore re-kwd))
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(multiple-value-bind (scanner reg-names)
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(let ((cl-ppcre:*allow-named-registers* t))
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(apply #'cl-ppcre:create-scanner regexp keys))
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(declare (ignorable reg-names))
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(setf (slot-value re-t 'scanner)
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scanner
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(slot-value re-t 'regexp)
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regexp
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(slot-value re-t 'vars)
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vars ; Maybe will merge with REG-NAMES...
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)
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)))
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#|
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(defmethod initialize-instance :after ((re-t regular-expression-template) &key)
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;; FIX: handling of CL-PPCRE:CREATE-SCANNER keywords. This can be
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;; done by using the "harier" syntax of SPEC (see above).
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(destructuring-bind (re-kwd regexp &optional vars &rest keys)
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(template-spec re-t)
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(declare (ignore re-kwd)
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(ignorable regexp vars keys))
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(multiple-value-bind (scanner reg-names)
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(let ((cl-ppcre:*allow-named-registers* t))
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(cl-ppcre:create-scanner (second (template-spec re-t))))
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(declare (ignorable reg-names))
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(setf (slot-value re-t 'scanner)
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scanner
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(slot-value re-t 'regexp)
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(second (template-spec re-t)) ; For the time being just stored and
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; used for debugging.
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)
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)))
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|#
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;;;;---------------------------------------------------------------------------
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;;;; Implementation.
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;;; Unification.
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(defmethod unify ((ret1 regular-expression-template)
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(ret2 regular-expression-template)
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&optional (env (make-empty-environment))
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&key &allow-other-keys)
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(if (eq ret1 ret2)
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env
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;; I could UNIFY the result of the CL-PPCRE:PARSE-STRINGs.
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(error 'unification-failure
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:format-control "Do not know how unify the two ~
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regular-expression templates: ~S and ~S."
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:format-arguments (list ret1 ret2))))
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(defmethod unify ((re-t regular-expression-template) (s string)
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&optional (env (make-empty-environment))
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&key
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(start 0)
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end
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&allow-other-keys)
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(declare (type (integer 0 #.most-positive-fixnum) start)
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(type (or null (integer 0 #.most-positive-fixnum)) end))
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(let ((end (or end (length s))))
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(declare (type (integer 0 #.most-positive-fixnum) end))
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2009-12-17 mantoniotti
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(multiple-value-bind (matched-p strings)
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(cl-ppcre:scan-to-strings (scanner re-t) s :start start :end end)
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(unless matched-p
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(error 'unification-failure
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:format-control "String ~S cannot be matched against ~
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regular expression ~S."
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:format-arguments (list s
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(regular-expression re-t))))
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(let ((vars (variables re-t)))
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(if (null vars)
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env
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(loop for r-string of-type string across strings
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for v in vars
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for result-env = (var-unify v r-string env)
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then (var-unify v r-string result-env)
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finally (return result-env))))
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)))
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(defmethod unify ((s string) (re-t regular-expression-template)
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&optional (env (make-empty-environment))
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&key (start 0) end &allow-other-keys)
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(unify re-t s env :start start :end end))
2011-04-02 rbrown
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2004-11-17 mantoniotti
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;;;; end of file -- cl-ppcre-template.lisp --