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(in-package #:cmamut)
; Ideas:
; Generate code that creates a package and puts all definitions there.
; If symbol names are unaltered we can skip connecting everything together.
; To avoid collisions the created package shouldn't import any symbols.
; Maybe use straight defuns and ffi functions to get as close as possible to the C names without much work.
; Only define functions from the target library, but get all other definitions.
; TODO: Get constants from macro file generated by c2ffi -M
; TODO: Use c2ffi to extract the spec.json using the header file as parameter
(defvar reference-table (make-hash-table :test #'equal :size 256))
(defun get-spec ()
(json:from-file "~/common-lisp/cmamut/spec.json"))
(defun cook-type (raw-type)
(let ((tag (gethash "tag" raw-type)))
(cond ((string= tag ":void")
'sb-alien:void)
((string= tag ":function-pointer")
'sb-alien:function)
((string= tag ":pointer")
(let ((pointed-type (gethash "type" raw-type)))
(if (string= (gethash "tag" pointed-type) ":char")
'sb-alien:c-string
(list 'sb-alien:* (cook-type pointed-type)))))
((string= tag ":float")
'sb-alien:float)
((string= tag ":double")
'sb-alien:double)
((string= tag ":unsigned-char")
'sb-alien:unsigned-char)
((string= tag ":unsigned-short")
'sb-alien:unsigned-short)
((string= tag ":unsigned-int")
'sb-alien:unsigned-int)
((string= tag ":unsigned-long")
'sb-alien:unsigned-long)
((string= tag ":char")
'sb-alien:char)
((string= tag ":short")
'sb-alien:short)
((string= tag ":int")
'sb-alien:int)
((string= tag ":long")
'sb-alien:long)
((string= tag ":struct")
(list 'sb-alien:struct (gethash "name" raw-type)))
((string= tag ":union")
(list 'sb-alien:union (gethash "name" raw-type)))
((string= tag "struct")
(cook-struct raw-type))
((string= tag "union")
(cook-union raw-type))
(t tag))))
(defun cook-function (raw-function &optional name-transformer)
(let ((raw-params (gethash "parameters" raw-function))
(cooked-params (queue:new)))
(dotimes (j (length raw-params))
(queue:add cooked-params
(list (intern (string-upcase (gethash "name" (aref raw-params j))))
(cook-type (gethash "type" (aref raw-params j))))))
`(sb-alien:define-alien-routine
,(let ((function-name (gethash "name" raw-function)))
(if name-transformer
(list function-name (funcall name-transformer function-name))
function-name))
,(cook-type (gethash "return-type" raw-function))
,@(queue:to-list cooked-params))))
(defun cook-typedef (raw-typedef)
(let* ((base-type (gethash "type" raw-typedef))
(new-name (gethash "name" raw-typedef))
(enum? (string= (gethash "tag" base-type) ":enum")))
(when enum?
(setf (gethash (gethash "id" base-type) reference-table)
new-name))
`(sb-alien:define-alien-type
,new-name
,(if enum?
`(sb-alien:enum ,new-name)
(cook-type base-type)))))
(defun cook-struct (raw-struct)
(let ((raw-fields (gethash "fields" raw-struct))
(cooked-fields (queue:new)))
(dotimes (j (length raw-fields))
(queue:add cooked-fields
(list (intern (string-upcase (gethash "name" (aref raw-fields j))))
(cook-type (gethash "type" (aref raw-fields j))))))
`(sb-alien:struct
,(gethash "name" raw-struct)
,@(queue:to-list cooked-fields))))
(defun cook-union (raw-union)
(let ((raw-fields (gethash "fields" raw-union))
(cooked-fields (queue:new)))
(dotimes (j (length raw-fields))
(queue:add cooked-fields
(list (intern (string-upcase (gethash "name" (aref raw-fields j))))
(cook-type (gethash "type" (aref raw-fields j))))))
`(sb-alien:union
,(gethash "name" raw-union)
,@(queue:to-list cooked-fields))))
(defun cook-enum (raw-enum)
(let ((name (gethash (gethash "id" raw-enum) reference-table))
(raw-fields (gethash "fields" raw-enum))
(cooked-fields (queue:new)))
(dotimes (j (length raw-fields))
(queue:add cooked-fields
(list (intern (string-upcase (gethash "name" (aref raw-fields j))))
(gethash "value" (aref raw-fields j)))))
`(sb-alien:define-alien-type
nil
(sb-alien:enum
,name
,@(queue:to-list cooked-fields)))))
(defstruct spec
functions
typedefs
structs
unions
enums)
(defun prepare-spec (spec)
(clrhash reference-table)
(let ((s (make-spec)))
(dotimes (i (length spec))
(cond ((string= (gethash "tag" (aref spec i)) "function")
(push (aref spec i) (spec-functions s)))
((string= (gethash "tag" (aref spec i)) "typedef")
(push (aref spec i) (spec-typedefs s)))
((string= (gethash "tag" (aref spec i)) "struct")
(push (aref spec i) (spec-structs s)))
((string= (gethash "tag" (aref spec i)) "enum")
(push (aref spec i) (spec-enums s)))
((string= (gethash "tag" (aref spec i)) "union")
(push (aref spec i) (spec-unions s)))
(t)))
; typedefs must be generated first to build the reference table
(setf (spec-typedefs s) (mapcar #'cook-typedef (spec-typedefs s)))
(setf (spec-functions s) (mapcar #'cook-function (spec-functions s)))
(setf (spec-enums s) (mapcar #'cook-enum (spec-enums s)))
(setf (spec-structs s)
(mapcar (lambda (x)
`(sb-alien:define-alien-type nil ,(cook-struct x)))
(spec-structs s)))
(setf (spec-unions s)
(mapcar (lambda (x)
`(sb-alien:define-alien-type nil ,(cook-union x)))
(spec-unions s)))
s))
(defun to-file (spec filename)
(with-open-file (f filename
:direction :output
:if-exists :overwrite
:if-does-not-exist :create)
; definitions must be written in the following order to avoid "unknown type" errors
(princ ";;; GENERATED BY CMAMUT" f)
(terpri f)
(format f "~{~s~&~}" (spec-typedefs spec))
(format f "~{~s~&~}" (spec-enums spec))
(format f "~{~s~&~}" (spec-structs spec))
(format f "~{~s~&~}" (spec-unions spec))
(format f "~{~s~&~}" (spec-functions spec))))
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