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;;;; Objective-CL, an Objective-C bridge for Common Lisp.
;;;; Copyright (C) 2007 Matthias Andreas Benkard.
;;;;
;;;; This program is free software: you can redistribute it and/or
;;;; modify it under the terms of the GNU Lesser General Public License
;;;; as published by the Free Software Foundation, either version 3 of
;;;; the License, or (at your option) any later version.
;;;;
;;;; This program is distributed in the hope that it will be useful, but
;;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;;; Lesser General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU Lesser General Public
;;;; License along with this program. If not, see
;;;; <http://www.gnu.org/licenses/>.
(in-package #:mulk.objective-cl)
(defun parse-typespec (typestring &optional return-type-p (start 0))
"Parse a typestring like \"@0:4{_NSRange=II}8\" into something like (ID ()).
\"rn{_NSRange=II}8\" is parsed into (STRUCT (CONST IN)
\"_NSRange\" :INTEGER :INTEGER).
\"(sversion=\"version\"i\"next_free\"^v)\" is parsed into (UNION ()
\"sversion\" (:INT ((NAME \"version\"))) (POINTER ((NAME
\"next_free\")) (:VOID ())))
Returns: (VALUES typespec byte-position string-position)"
(let ((init-char (char typestring start))
(string-position start)
(qualifiers (list)))
(loop do (setq init-char (char typestring string-position))
while (let ((qualifier (case init-char
(#\r 'const)
(#\n 'in)
(#\N 'inout)
(#\o 'out)
(#\O 'bycopy)
(#\V 'oneway)
(#\R 'byref)
(#\" :name))))
(and qualifier
(incf string-position)
(if (eq qualifier :name)
(let ((name-end (position #\"
typestring
:start string-position)))
(push (list qualifier
(subseq typestring
string-position
name-end))
qualifiers)
(setf string-position (1+ name-end))
qualifier)
(push qualifier qualifiers)))))
(let ((typespec
(case init-char
((#\{ #\()
(let* ((=-token (position #\= typestring :start start))
(closing-delim (position (ecase init-char
(#\{ #\})
(#\( #\)))
typestring
:start start))
(name-end (if (and =-token closing-delim)
(min =-token closing-delim)
;; An opaque struct whose contents
;; we don't know.
(or closing-delim
(error "Premature end of file in~
typespec: ~A."
typestring))))
(named-p (and =-token (= name-end =-token)))
(struct-name (subseq typestring
(1+ string-position)
name-end)))
(list* (ecase init-char
(#\{ 'struct)
(#\( 'union))
(if named-p
qualifiers
(cons 'opaque qualifiers))
struct-name
(progn
(setq string-position
(if named-p
(1+ name-end) ; skip #\=
name-end))
(loop until (char= (char typestring string-position)
(ecase init-char
(#\{ #\})
(#\( #\))))
collect (multiple-value-bind (typespec
byte-position
new-string-pos)
(parse-typespec
typestring
nil
string-position)
(declare (ignore byte-position))
(setq string-position new-string-pos)
typespec)
;; Skip end marker (right brace/paren).
finally (incf string-position))))))
(#\^ (list 'pointer
qualifiers
(multiple-value-bind (typespec byte-pos new-str-pos)
(parse-typespec typestring
nil
(1+ string-position))
(declare (ignore byte-pos))
(prog1 typespec
(setq string-position new-str-pos)))))
(#\[ (list 'array
qualifiers
(multiple-value-bind (count new-str-pos)
(parse-integer typestring
:start (1+ string-position)
:junk-allowed t)
(prog1 count
(setq string-position new-str-pos)))
(multiple-value-bind (typespec byte-pos new-str-pos)
(parse-typespec typestring nil string-position)
(declare (ignore byte-pos))
;; Skip end marker (right bracket).
(prog1 typespec
(setq string-position (1+ new-str-pos))))))
(#\j
(list 'complex
qualifiers
(multiple-value-bind (typespec byte-pos new-str-pos)
(parse-typespec typestring nil (1+ string-position))
(declare (ignore byte-pos))
(prog1 typespec
(setq string-position new-str-pos)))))
(#\b
(if (eq +runtime-type+ :gnu)
(let (bit-field-starting-pos
bit-field-typespec
bit-field-length
byte-position)
(multiple-value-setq (bit-field-starting-pos string-position)
(parse-integer typestring
:start (1+ string-position)
:junk-allowed t))
(multiple-value-setq (bit-field-typespec
byte-position
string-position)
(parse-typespec typestring nil string-position))
(multiple-value-setq (bit-field-length string-position)
(parse-integer typestring
:start string-position
:junk-allowed t))
(list 'bit-field
qualifiers
bit-field-starting-pos
bit-field-length
bit-field-typespec))
(list 'bit-field
qualifiers
nil
(multiple-value-bind (bit-field-length new-string-pos)
(parse-integer typestring
:start (1+ string-position)
:junk-allowed t)
(setq string-position new-string-pos)
bit-field-length))))
(otherwise
(let ((children (list)))
(prog1 (list* (case init-char
(#\B :boolean) ;XXX :int?
(#\c (if (and (eq +runtime-type+ :next)
(or return-type-p
(featurep 'cffi-features:ppc32)))
(prog1 :int
(push '(nominally :char)
qualifiers))
:char))
(#\C (if (and (eq +runtime-type+ :next)
(or return-type-p
(featurep 'cffi-features:ppc32)))
(prog1 :unsigned-int
(push '(nominally :unsigned-char)
qualifiers))
:unsigned-char))
(#\s (if (and (eq +runtime-type+ :next)
(or return-type-p
(featurep 'cffi-features:ppc32)))
(prog1 :int
(push '(nominally :short)
qualifiers))
:short))
(#\S (if (and (eq +runtime-type+ :next)
(or return-type-p
(featurep 'cffi-features:ppc32)))
(prog1 :unsigned-int
(push '(nominally :unsigned-short)
qualifiers))
:unsigned-short))
(#\i :int)
(#\I :unsigned-int)
(#\l :long)
(#\L :unsigned-long)
(#\q :long-long)
(#\Q :unsigned-long-long)
(#\f :float)
(#\d :double)
(#\v :void)
(#\@ 'id)
(#\# 'objective-c-class)
(#\: 'selector)
(#\* :string)
(#\? :unknown)
(otherwise
(prog1 :unrecognised
(push init-char children))))
qualifiers
children)
(incf string-position)))))))
(when (and (> (length typestring) string-position)
(char= (char typestring string-position) #\"))
(let ((type-end (position #\" typestring :start (1+ string-position))))
(push (list :type (subseq typestring (1+ string-position) type-end))
(cadr typespec))
(setf string-position (1+ type-end))))
(values typespec nil string-position))))
(defun typespec (typespec-designator)
(etypecase typespec-designator
(symbol (list typespec-designator ()))
(list typespec-designator)))
(defun print-typespec-to-string (typespec)
(with-output-to-string (out)
(print-typespec typespec out)))
(defun print-typespec (typespec &optional (stream *standard-output*))
"Convert a TYPESPEC into a typestring and write the result to a STREAM."
(destructuring-bind (type-name modifiers &rest rest)
(typespec typespec)
(dolist (modifier modifiers)
(format stream "~A" (case modifier
(const #\r)
(in #\n)
(inout #\N)
(out #\o)
(bycopy #\O)
(oneway #\V)
(byref #\R)
(opaque "")
(otherwise
(assert (listp modifier))
(ecase (first modifier)
((nominally) (setq type-name
(second modifier))))
""))))
(case type-name
((struct union) (destructuring-bind (name . children) rest
(format stream "~C~A"
(ecase type-name
(struct #\{)
(union #\())
name)
(unless (member 'opaque modifiers)
(format stream "=")
(dolist (child children)
(print-typespec child stream)))
(format stream "~C" (ecase type-name
(struct #\})
(union #\))))))
((bit-field) (if (eq +runtime-type+ :gnu)
(destructuring-bind (alignment length . children) rest
(format stream "b~D" alignment)
(dolist (child children)
(print-typespec child stream))
(format stream "~D" length))
(destructuring-bind (alignment length . children) rest
(declare (ignore alignment children))
(format stream "b~D" length))))
((array) (destructuring-bind (length . children) rest
(format stream "[~D" length)
(dolist (child children)
(print-typespec child stream))
(format stream "]")))
((:unrecognised) (format stream "~{~A~}" rest))
(t (format stream "~A" (typespec-name->type-id type-name))
(dolist (child rest)
(print-typespec child stream))))))
(defun typespec-nominal-type (typespec)
;; Do the modifiers include something like (NOMINALLY :UNSIGNED-CHAR)?
;; Return NIL if that is not the case, otherwise return the nominal
;; type found.
(cadr (find-if #'(lambda (x) (and (consp x)
(eq (car x) 'nominally)))
(cadr (typespec typespec)))))
(defun typespec-primary-type (typespec)
(car (typespec typespec)))
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