Commit a4f2150c0a11967bd4729ed1a1c287b3a2be5453
2018-07-02T15:33:25
Character matcher classes for cl-stream.
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diff --git a/matcher-stream.asd b/matcher-stream.asd
new file mode 100644
index 0000000..94fdce4
--- /dev/null
+++ b/matcher-stream.asd
@@ -0,0 +1,34 @@
+;;
+;; matcher-stream - Character matcher classes for cl-stream
+;;
+;; Copyright 2018 Thomas de Grivel <thoxdg@gmail.com>
+;;
+;; Permission to use, copy, modify, and distribute this software for any
+;; purpose with or without fee is hereby granted, provided that the above
+;; copyright notice and this permission notice appear in all copies.
+;;
+;; THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+;; WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+;; MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+;; ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+;; WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+;; ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+;; OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+;;
+
+(in-package :common-lisp-user)
+
+(defpackage :matcher-stream.system
+ (:use :common-lisp :asdf))
+
+(in-package :matcher-stream.system)
+
+(defsystem :matcher-stream
+ :name "matcher-stream"
+ :author "Thomas de Grivel <thoxdg@gmail.com>"
+ :version "0.1"
+ :description "Matcher classes for cl-stream"
+ :depends-on ("cl-stream")
+ :components
+ ((:file "package")
+ (:file "matcher-stream" :depends-on ("package"))))
diff --git a/matcher-stream.lisp b/matcher-stream.lisp
new file mode 100644
index 0000000..57de4e8
--- /dev/null
+++ b/matcher-stream.lisp
@@ -0,0 +1,231 @@
+;;
+;; matcher-stream - Character matcher classes for cl-stream
+;;
+;; Copyright 2018 Thomas de Grivel <thoxdg@gmail.com>
+;;
+;; Permission to use, copy, modify, and distribute this software for any
+;; purpose with or without fee is hereby granted, provided that the above
+;; copyright notice and this permission notice appear in all copies.
+;;
+;; THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+;; WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+;; MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+;; ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+;; WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+;; ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+;; OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+;;
+
+(in-package :matcher-stream)
+
+(defclass matcher-stream (super-stream buffered-input-stream)
+ ((line :initarg :input-line
+ :initform 0
+ :accessor matcher-input-line
+ :type fixnum+)
+ (column :initarg :input-column
+ :initform 0
+ :accessor matcher-input-column
+ :type fixnum+)
+ (input-ended :initform nil
+ :accessor matcher-input-ended
+ :type boolean)))
+
+(defgeneric matcher-input (matcher-stream)
+ (:documentation "Read a character from underlying stream and put it
+ in input buffer."))
+
+(defgeneric matcher-input-n (matcher-stream n)
+ (:documentation "Ensure at least N characters are in input buffer."))
+
+(defgeneric matcher-char (matcher-stream index)
+ (:documentation "Ensure input and return the character from input
+buffer for matching at index."))
+
+(defgeneric matcher-start (matcher-stream)
+ (:documentation "Return match start for STREAM."))
+
+(defgeneric (setf matcher-start) (value matcher-stream)
+ (:documentation "Set match start for STREAM."))
+
+(defgeneric matcher-push-extend (stream character)
+ (:documentation "Put a character into input buffer, extending it by
+*BUFFER-SIZE* if necessary."))
+
+(defgeneric match (matcher-stream thing)
+ (:documentation "Advance match start if THING is matched in
+input buffer."))
+
+(defgeneric match-not (matcher-stream thing))
+
+(defgeneric match-option (matcher-stream thing))
+
+(defgeneric match-times (matcher-stream thing min max))
+
+(defgeneric match-until (matcher-stream thing)
+ (:documentation "Advance match start until THING is matched in
+input buffer."))
+
+;; Input
+
+(defmethod make-stream-input-buffer ((mh matcher-stream))
+ (let* ((in (stream-underlying-stream mh))
+ (element-type (stream-element-type in)))
+ (make-array `(,(stream-input-buffer-size mh))
+ :element-type element-type
+ :fill-pointer 0)))
+
+(defmethod matcher-push-extend ((mh matcher-stream) item)
+ (let* ((buffer (stream-input-buffer mh))
+ (ibs (stream-input-buffer-size mh))
+ (fp (fill-pointer buffer))
+ (new-fp (1+ fp)))
+ (declare (type fixnum ibs fp new-fp))
+ (if (= fp (the fixnum (array-dimension buffer 0)))
+ (let ((new-buffer (adjust-array buffer
+ (the fixnum (+ fp ibs))
+ :fill-pointer new-fp)))
+ (setf (stream-input-buffer mh) new-buffer))
+ (setf (fill-pointer buffer) new-fp))
+ (locally (declare (optimize (safety 0)))
+ (setf (aref buffer fp) item))
+ fp))
+
+(defmethod matcher-input ((mh matcher-stream))
+ (let ((in (stream-underlying-stream mh)))
+ (multiple-value-bind (item state) (stream-read in)
+ (ecase state
+ ((nil) (let* ((pos (the fixnum (matcher-push-extend mh item)))
+ (buf (stream-input-buffer mh)))
+ (declare (type vector buf))
+ (cond ((or (and (char= #\Newline item)
+ (or (not (< 0 pos))
+ (char/= #\Return
+ (char buf (1- pos)))))
+ (char= #\Return item))
+ (setf (matcher-input-column mh) 0)
+ (incf (the fixnum (matcher-input-line mh))))
+ (t
+ (incf (the fixnum (matcher-input-column mh)))))
+ (values item nil)))
+ ((:eof) (setf (matcher-input-ended mh) t)
+ (values nil :eof))
+ ((:non-blocking)
+ (signal (make-condition 'non-blocking :stream mh)))))))
+
+(defmethod matcher-start ((mh matcher-stream))
+ (stream-input-index mh))
+
+(defmethod (setf matcher-start) ((value integer) (mh matcher-stream))
+ (setf (stream-input-index mh) (the fixnum value)))
+
+(defmethod matcher-input-n ((mh matcher-stream) (n integer))
+ (declare (type fixnum n))
+ (loop
+ (let ((length (- (the fixnum (fill-pointer (stream-input-buffer mh)))
+ (the fixnum (matcher-start mh)))))
+ (declare (type fixnum length))
+ (when (or (matcher-input-ended mh)
+ (<= n length))
+ (return))
+ (matcher-input mh))))
+
+(defmethod matcher-char ((mh matcher-stream) (index integer))
+ (declare (type fixnum index))
+ (matcher-input-n mh (the fixnum (1+ index)))
+ (let ((buf (stream-input-buffer mh))
+ (match-index (+ (the fixnum (matcher-start mh))
+ index)))
+ (declare (type (vector character) buf)
+ (type fixnum match-index))
+ (char buf match-index)))
+
+;; Matcher
+
+(defmethod match ((mh matcher-stream) (s string))
+ (let* ((length (length s))
+ (match-start (matcher-start mh))
+ (match-end (+ match-start length))
+ (buffer (stream-input-buffer mh)))
+ (declare (type fixnum length match-start match-end)
+ (type (vector character) buffer))
+ (matcher-input-n mh length)
+ (when (and (<= match-end (length buffer))
+ (string= s buffer :start2 match-start :end2 match-end))
+ (incf (the fixnum (matcher-start mh)) length))))
+
+(defmethod match ((mh matcher-stream) (c character))
+ (when (char= c (matcher-char mh 0))
+ (incf (the fixnum (matcher-start mh)))))
+
+(defmethod match-until ((mh matcher-stream) (s string))
+ (matcher-input-n mh (length s))
+ (loop
+ (let ((match (match mh s)))
+ (when match
+ (return match)))
+ (when (matcher-input-ended mh)
+ (return))
+ (matcher-input mh)
+ (incf (the fixnum (matcher-start mh)))))
+
+(defmethod match-until ((mh matcher-stream) (f function))
+ (loop
+ (let ((match (funcall f mh)))
+ (when match
+ (return match)))
+ (when (matcher-input-ended mh)
+ (return))
+ (matcher-input mh)
+ (incf (the fixnum (matcher-start mh)))))
+
+(defmethod match-option ((mh matcher-stream) (f function))
+ (or (funcall f mh)
+ (matcher-start mh)))
+
+(defmethod match-not ((mh matcher-stream) (f function))
+ (let ((match-start (matcher-start mh)))
+ (cond ((or (funcall f mh)
+ (matcher-input-ended mh))
+ (setf (matcher-start mh) match-start)
+ nil)
+ (t
+ (incf (the fixnum (matcher-start mh)))))))
+
+(defmacro match-sequence (matcher-stream &body body)
+ (let ((mh (gensym "MH-"))
+ (match-start (gensym "MATCH-START-"))
+ (result (gensym "RESULT-")))
+ `(let* ((,mh ,matcher-stream)
+ (,match-start (matcher-start ,mh))
+ (,result (progn ,@body)))
+ (cond (,result
+ ,result)
+ (t
+ (setf (matcher-start ,mh) ,match-start)
+ nil)))))
+
+(defmethod match-times ((mh matcher-stream) (f function) (min integer) (max integer))
+ (declare (type fixnum min max))
+ (match-sequence mh
+ (let ((n 0))
+ (loop
+ (unless (< n max)
+ (return (matcher-start mh)))
+ (unless (funcall f mh)
+ (if (< n min)
+ (return nil)
+ (return (matcher-start mh))))
+ (incf n)))))
+
+(defmethod match-times ((mh matcher-stream) (f function) (min integer) (max null))
+ (declare (type fixnum min))
+ (match-sequence mh
+ (let ((n 0))
+ (declare (type fixnum n))
+ (loop
+ (unless (funcall f mh)
+ (if (< n min)
+ (return nil)
+ (return (matcher-start mh))))
+ (incf n)))))
diff --git a/package.lisp b/package.lisp
index ba0c5c8..e979d6d 100644
--- a/package.lisp
+++ b/package.lisp
@@ -1,7 +1,7 @@
;;
-;; token-stream - Lexer classes for cl-stream
+;; matcher-stream - Character matcher classes for cl-stream
;;
-;; Copyright 2017,2018 Thomas de Grivel <thoxdg@gmail.com>
+;; Copyright 2018 Thomas de Grivel <thoxdg@gmail.com>
;;
;; Permission to use, copy, modify, and distribute this software for any
;; purpose with or without fee is hereby granted, provided that the above
@@ -18,35 +18,26 @@
(in-package :common-lisp)
-(defpackage :token-stream
+(defpackage :matcher-stream
(:use :cl-stream
:common-lisp)
#.(cl-stream:shadowing-import-from)
(:export
- #:*buffer-size*
- #:discard-token
- #:lexer
- #:lexer-buffer
- #:lexer-character
- #:lexer-eof-p
- #:lexer-input
- #:lexer-input-ended
- #:lexer-input-n
- #:lexer-line
- #:lexer-match-char
- #:lexer-match-start
- #:lexer-token
- #:make-token
#:match
#:match-not
#:match-option
#:match-sequence
#:match-times
#:match-until
- #:pop-token
- #:push-token
- #:token
- #:token-character
- #:token-line
- #:token-stream
- #:token-string))
+ #:matcher
+ #:matcher-buffer
+ #:matcher-char
+ #:matcher-eof-p
+ #:matcher-input
+ #:matcher-input-column
+ #:matcher-input-ended
+ #:matcher-input-line
+ #:matcher-input-n
+ #:matcher-start
+ #:matcher-stream
+ ))
diff --git a/token-stream.asd b/token-stream.asd
deleted file mode 100644
index 202c07d..0000000
--- a/token-stream.asd
+++ /dev/null
@@ -1,34 +0,0 @@
-;;
-;; token-stream - Lexer classes for cl-stream
-;;
-;; Copyright 2017,2018 Thomas de Grivel <thoxdg@gmail.com>
-;;
-;; Permission to use, copy, modify, and distribute this software for any
-;; purpose with or without fee is hereby granted, provided that the above
-;; copyright notice and this permission notice appear in all copies.
-;;
-;; THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-;; WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-;; MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-;; ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-;; WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-;; ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-;; OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-;;
-
-(in-package :common-lisp-user)
-
-(defpackage :token-stream.system
- (:use :common-lisp :asdf))
-
-(in-package :token-stream.system)
-
-(defsystem :token-stream
- :name "token-stream"
- :author "Thomas de Grivel <thoxdg@gmail.com>"
- :version "0.1"
- :description "Lexer classes for cl-stream"
- :depends-on ("cl-stream")
- :components
- ((:file "package")
- (:file "token-stream" :depends-on ("package"))))
diff --git a/token-stream.lisp b/token-stream.lisp
deleted file mode 100644
index 0a903fb..0000000
--- a/token-stream.lisp
+++ /dev/null
@@ -1,340 +0,0 @@
-;;
-;; token-stream - Lexer classes for cl-stream
-;;
-;; Copyright 2017,2018 Thomas de Grivel <thoxdg@gmail.com>
-;;
-;; Permission to use, copy, modify, and distribute this software for any
-;; purpose with or without fee is hereby granted, provided that the above
-;; copyright notice and this permission notice appear in all copies.
-;;
-;; THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-;; WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-;; MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-;; ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-;; WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-;; ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-;; OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-;;
-
-(in-package :token-stream)
-
-(defclass token ()
- ((string :initarg :string
- :initform ""
- :accessor token-string
- :type string)
- (line :initarg :line
- :reader token-line
- :type (integer 0))
- (character :initarg :character
- :reader token-character
- :type (integer 0))))
-
-(defclass lexer-token (token)
- ((start :initarg :start
- :accessor token-start)))
-
-(defvar *buffer-size* 64)
-(declaim (type fixnum *buffer-size*))
-
-(defun make-buffer ()
- (make-array `(,*buffer-size*)
- :element-type 'character
- :adjustable t
- :fill-pointer 0))
-
-(defclass lexer (super-stream input-stream)
- ((line :initarg :line
- :initform 0
- :accessor lexer-line
- :type fixnum)
- (character :initarg :character
- :initform -1
- :accessor lexer-character
- :type fixnum)
- (input-ended :initform nil
- :accessor lexer-input-ended
- :type boolean)
- (buffer :initform (make-buffer)
- :accessor lexer-buffer
- :type string)
- (match :initform (make-instance 'lexer-token
- :line 0
- :character 0
- :start 0)
- :accessor lexer-match
- :type lexer-token)
- (stack :initform ()
- :accessor lexer-stack
- :type list)
- (eof-p :initform nil
- :accessor lexer-eof-p
- :type boolean)))
-
-(defgeneric discard-token (lexer)
- (:documentation "Discard token from lexer stack top."))
-
-(defgeneric lexer-input (lexer)
- (:documentation "Read a character from lexer in and put it into lexer
-buffer."))
-
-(defgeneric lexer-input-n (lexer n)
- (:documentation "Ensure at least N characters are in lexer buffer."))
-
-(defgeneric lexer-match-char (lexer index)
- (:documentation "Ensure input and return the character from lexer
-buffer for matching at index."))
-
-(defgeneric lexer-match-start (lexer)
- (:documentation "Return token start for lexer match."))
-
-(defgeneric (setf lexer-match-start) (value lexer)
- (:documentation "Set token start for lexer match."))
-
-(defgeneric lexer-push-extend (lexer character)
- (:documentation "Put a character into lexer buffer, extending it by
-*BUFFER-SIZE* if necessary."))
-
-(defgeneric lexer-token (lexer)
- (:documentation "Consumes and returns a token."))
-
-(defgeneric make-token (lexer symbol &rest initargs)
- (:documentation "Create a token of given class from lexer stack
-top."))
-
-(defgeneric match (lexer thing)
- (:documentation "Advance lexer match start if THING is matched in
-lexer buffer."))
-
-(defgeneric match-not (lexer thing))
-
-(defgeneric match-option (lexer thing))
-
-(defgeneric match-times (lexer thing min max))
-
-(defgeneric match-until (lexer thing)
- (:documentation "Advance lexer match start until THING is matched in
-lexer buffer."))
-
-(defgeneric pop-token (lexer)
- (:documentation "Return the last token on lexer stack."))
-
-(defgeneric push-token (lexer)
- (:documentation "Push a copy of the lexer match onto the lexer
-stack."))
-
-;; Stream methods
-
-(defmethod stream-element-type ((lx lexer))
- 'token)
-
-;; Input
-
-(defmethod lexer-push-extend ((lx lexer) item)
- (let* ((buffer (lexer-buffer lx))
- (fp (the fixnum (fill-pointer buffer)))
- (new-fp (1+ fp)))
- (if (= fp (array-dimension buffer 0))
- (let ((new-buffer (adjust-array buffer
- (the fixnum (+ fp *buffer-size*))
- :fill-pointer new-fp)))
- (setf (lexer-buffer lx) new-buffer))
- (setf (fill-pointer buffer) new-fp))
- (locally (declare (optimize (safety 0)))
- (setf (aref buffer fp) item))
- fp))
-
-(defmethod lexer-input ((lx lexer))
- (let ((in (stream-underlying-stream lx)))
- (multiple-value-bind (item state) (stream-read in)
- (ecase state
- ((nil) (let* ((pos (the fixnum (lexer-push-extend lx item)))
- (buf (lexer-buffer lx)))
- (declare (type vector buf))
- (cond ((or (and (char= #\Newline item)
- (or (not (< 0 pos))
- (char/= #\Return
- (char buf (1- pos)))))
- (char= #\Return item))
- (setf (lexer-character lx) 0)
- (incf (the fixnum (lexer-line lx))))
- (t
- (incf (the fixnum (lexer-character lx)))))
- (values item nil)))
- ((:eof) (setf (lexer-input-ended lx) t)
- (values nil :eof))
- ((:non-blocking)
- (signal (make-condition 'non-blocking :stream lx)))))))
-
-(defmethod lexer-match-start ((lx lexer))
- (token-start (lexer-match lx)))
-
-(defmethod (setf lexer-match-start) ((value integer) (lx lexer))
- (setf (token-start (lexer-match lx)) (the fixnum value)))
-
-(defmethod lexer-input-n ((lx lexer) (n integer))
- (declare (type fixnum n))
- (loop
- (let ((length (- (the fixnum (fill-pointer (lexer-buffer lx)))
- (the fixnum (lexer-match-start lx)))))
- (declare (type fixnum length))
- (when (or (lexer-input-ended lx)
- (<= n length))
- (return))
- (lexer-input lx))))
-
-(defmethod lexer-match-char ((lx lexer) (index integer))
- (declare (type fixnum index))
- (lexer-input-n lx (the fixnum (1+ index)))
- (let ((buf (lexer-buffer lx))
- (match-index (+ (the fixnum (lexer-match-start lx))
- index)))
- (declare (type (vector character) buf)
- (type fixnum match-index))
- (char buf match-index)))
-
-;; Tokenizer
-
-(defmethod push-token ((lx lexer))
- (let* ((match (lexer-match lx))
- (line (token-line match))
- (character (token-character match))
- (start (token-start match))
- (token (make-instance 'lexer-token
- :line line
- :character character
- :start start)))
- (push token (lexer-stack lx))))
-
-(defun subseq* (sequence start &optional end)
- (subseq sequence start end))
-
-(defmethod pop-token ((lx lexer))
- (assert (lexer-stack lx))
- (let* ((buffer (lexer-buffer lx))
- (fp (fill-pointer buffer))
- (token (pop (lexer-stack lx)))
- (match-start (lexer-match-start lx))
- (string (subseq* buffer (token-start token) match-start)))
- (setf (token-string token) string)
- (when (endp (lexer-stack lx))
- (replace buffer buffer :start2 match-start :end2 fp)
- (setf (lexer-match-start lx) 0
- (fill-pointer buffer) (- fp match-start)))
- token))
-
-(defmethod make-token ((lx lexer) (class symbol) &rest initargs)
- (let ((lt (pop-token lx)))
- (apply #'make-instance class
- :string (token-string lt)
- :line (token-line lt)
- :character (token-character lt)
- initargs)))
-
-(defmethod discard-token ((lx lexer))
- (pop (lexer-stack lx))
- (when (endp (lexer-stack lx))
- (let* ((buffer (lexer-buffer lx))
- (fp (fill-pointer buffer))
- (match-start (lexer-match-start lx)))
- (replace buffer buffer :start2 match-start :end2 fp)
- (setf (lexer-match-start lx) 0
- (fill-pointer buffer) (- fp match-start))))
- nil)
-
-;; Matcher
-
-(defmethod match ((lx lexer) (s string))
- (let* ((length (length s))
- (match-start (lexer-match-start lx))
- (match-end (+ match-start length))
- (buffer (lexer-buffer lx)))
- (declare (type fixnum length match-start match-end)
- (type (vector character) buffer))
- (lexer-input-n lx length)
- (when (and (<= match-end (length buffer))
- (string= s buffer :start2 match-start :end2 match-end))
- (incf (the fixnum (lexer-match-start lx)) length))))
-
-(defmethod match ((lx lexer) (c character))
- (when (char= c (lexer-match-char lx 0))
- (incf (the fixnum (lexer-match-start lx)))))
-
-(defmethod match-until ((lx lexer) (s string))
- (lexer-input-n lx (length s))
- (loop
- (let ((match (match lx s)))
- (when match
- (return match)))
- (when (lexer-input-ended lx)
- (return))
- (lexer-input lx)
- (incf (the fixnum (lexer-match-start lx)))))
-
-(defmethod match-until ((lx lexer) (f function))
- (loop
- (let ((match (funcall f lx)))
- (when match
- (return match)))
- (when (lexer-input-ended lx)
- (return))
- (lexer-input lx)
- (incf (the fixnum (lexer-match-start lx)))))
-
-(defmethod match-option ((lx lexer) (f function))
- (or (funcall f lx)
- (lexer-match-start lx)))
-
-(defmethod match-not ((lx lexer) (f function))
- (let ((match-start (lexer-match-start lx)))
- (cond ((or (funcall f lx)
- (lexer-input-ended lx))
- (setf (lexer-match-start lx) match-start)
- nil)
- (t
- (incf (the fixnum (lexer-match-start lx)))))))
-
-(defmacro match-sequence (lexer &body body)
- (let ((lx (gensym "LX-"))
- (match-start (gensym "MATCH-START-"))
- (result (gensym "RESULT-")))
- `(let* ((,lx ,lexer)
- (,match-start (lexer-match-start ,lx))
- (,result (progn ,@body)))
- (cond (,result
- ,result)
- (t
- (setf (lexer-match-start ,lx) ,match-start)
- nil)))))
-
-(defmethod match-times ((lx lexer) (f function) (min integer) (max integer))
- (declare (type fixnum min max))
- (match-sequence lx
- (let ((n 0))
- (loop
- (unless (< n max)
- (return (lexer-match-start lx)))
- (unless (funcall f lx)
- (if (< n min)
- (return nil)
- (return (lexer-match-start lx))))
- (incf n)))))
-
-(defmethod match-times ((lx lexer) (f function) (min integer) (max null))
- (declare (type fixnum min))
- (match-sequence lx
- (let ((n 0))
- (declare (type fixnum n))
- (loop
- (unless (funcall f lx)
- (if (< n min)
- (return nil)
- (return (lexer-match-start lx))))
- (incf n)))))
-
-(defmethod stream-read ((lx lexer))
- (if (lexer-eof-p lx)
- (values nil :eof)
- (handler-case (values (lexer-token lx) nil)
- (end-of-file () (values nil :eof))
- (non-blocking () (values nil :non-blocking)))))