;; -*- Mode: LISP; Syntax: COMMON-LISP; Package: CLPYTHON; Readtable: PY-AST-USER-READTABLE -*-

;;

;; This software is Copyright (c) Franz Inc. and Willem Broekema.

;; Franz Inc. and Willem Broekema grant you the rights to

;; distribute and use this software as governed by the terms

;; of the Lisp Lesser GNU Public License

;; (http://opensource.franz.com/preamble.html),

;; known as the LLGPL.

;;; To have Emacs properly indent the DEF-PY-METHOD form, add to .emacs:

;;; (put 'def-py-method 'fi:common-lisp-indent-hook (get 'defmethod 'fi:common-lisp-indent-hook))

(in-package :clpython)

(in-syntax *ast-user-readtable*)

;; TODO: ensure all items listed in this table are implemented

;; http://www.python.org/doc/current/library/inspect.html

;; Python metatype. Class `type' and subclasses thereof are instances

;; of py-meta-type.

(defun finalize-inheritance (c)

(closer-mop:finalize-inheritance c))

(defmethod initialize-instance :after ((cls py-meta-type) &rest initargs)

(declare (ignore initargs))

(finalize-inheritance cls))

(defmethod initialize-instance :after ((cls py-type) &rest initargs)

(declare (ignore initargs))

(finalize-inheritance cls))

;; Lisp type/object

(defclass py-lisp-type (py-type)

()

(:documentation "Metaclass for proxy classes")

(:metaclass py-meta-type))

(defclass py-lisp-object (object)

((lisp-object :initarg :lisp-object :accessor proxy-lisp-val))

(:metaclass py-lisp-type)

(:documentation "Base class for proxy classes"))

(defun ensure-class (&rest args)

(apply #'closer-mop:ensure-class args))

(defun ensure-class-using-class (&rest args)

(apply #'closer-mop:ensure-class-using-class args))

(defun class-direct-superclasses (&rest args)

(apply #'closer-mop:class-direct-superclasses args))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;;;

;;; This is a bit ugly, but method classes must be evaluated prior to their

;;; use. Therefore here are method classes, and below their methods.

;;;

;;; Note that PY-METHOD is not a Lisp FUNCTION.

(defclass py-method (object)

((func :initarg :func :accessor py-method-func))

(:metaclass py-type))

(defclass py-class-method (py-method)

((class :initarg :class))

(:metaclass py-type))

(defclass py-attribute-method (py-method)

()

(:metaclass py-type))

(defclass py-class-attribute-method (py-attribute-method)

()

(:metaclass py-type))

(defclass py-writable-attribute-method (py-attribute-method)

((write-func :initarg :writer :accessor attribute-writer))

(:metaclass py-type))

(defun make-writable-attribute (reader writer)

(make-instance 'py-writable-attribute-method :func reader :writer writer))

(defmethod print-object ((x py-writable-attribute-method) stream)

(print-unreadable-object (x stream)

(format stream ":func ~S " (if (slot-boundp x 'func) (slot-value x 'func) "(not set)"))

(format stream ":write-func ~S" (if (slot-boundp x 'write-func) (slot-value x 'write-func) "(not set)"))))

(defclass py-static-method (py-method)

()

(:metaclass py-type))

(defparameter *writable-attribute-methods* (make-hash-table :test #'eq))

(eval-when (:compile-toplevel :load-toplevel :execute)

(defun ensure-pkg-symbol (str pkg)

(check-type str string)

(or (find-symbol str pkg)

(intern str pkg)))

(defun ensure-user-symbol (str)

(ensure-pkg-symbol str #.(find-package :clpython.user)))

) ;; eval-when

(defmacro def-py-method (cls.meth &rest args)

;; As `cls.meth' is a symbol, but methods of Python classes are always in

;; lowercase, the `meth' part is converted to lowercase iff the symbol name

;; is all in upper case. This means you cannot create a full-upper-case method

;; name with DEF-PY-METHOD.

(labels ()

(let* ((cm (symbol-name cls.meth))

(dot-pos (or (position #\. cm)

(error "Need dot in name: (def-py-method classname.methodname ..); got: ~A"

cls.meth)))

;; The class names must be a symbol defined in the same pkg

;; as the `cls.meth' argument to this macro.

(cls (intern (subseq cm 0 dot-pos) (symbol-package cls.meth)))

(meth (let ((methname (subseq cm (1+ dot-pos))))

(when (not (some #'lower-case-p methname))

;; Can't use (every #'upper-case-p) because of dashes

(setf methname (nstring-downcase methname)))

(ensure-user-symbol methname)))

(modifiers (loop while (keywordp (car args)) collect (pop args)))

(func-name (if (eq (car modifiers) :attribute-write)

(ensure-user-symbol (format nil "~A-~A" cls.meth '#:writer))

cls.meth)))

(assert (<= (length modifiers) 1) ()

"Multiple modifiers for a py-method: ~A. Todo?" modifiers)

`(progn ,(destructuring-bind (func-args &body func-body) args

(loop with real-args

with body = `(locally ,@func-body) ;; allows DECLARE forms at head

for sym in func-args

for sym-name = (when (symbolp sym) (symbol-name sym))

if (not (symbolp sym))

do (push sym real-args)

else if (char= #\^ (aref sym-name (1- (length sym-name))))

do (let ((real-name (intern (subseq sym-name 0 (1- (length sym-name)))

#.*package*)))

(push real-name real-args)

(setf body `(let ((,real-name (deproxy ,real-name)))

(declare (ignorable ,real-name))

,body)))

else do (push sym real-args)

finally (return (progn (setf real-args (nreverse real-args))

`(defun ,func-name ,real-args

;; Make all args ignorable. Otherwise there will be warnings for

;; unused variables even if there is (declare (ignore ..)) in the

;; function body: function body is wrapped in a LOCALLY.

;; XXX Ugly, should parse declare-ignore declarations.

,(let ((sym-args (remove-if-not (lambda (s) (and (symbolp s)

(not (char= (aref (string s) 0) #\&))))

real-args)))

`(declare (ignorable ,@sym-args)))

(block ,cls.meth

,body))))))

(register-method ',cls ',meth

,(ecase (car modifiers)

((nil) `(let ((f (function ,cls.meth)))

f))

(:static `(make-instance 'py-static-method

:func (function ,cls.meth)))

(:attribute `(make-instance 'py-attribute-method

:func (function ,cls.meth)))

(:class-attribute `(make-instance 'py-class-attribute-method

:func (function ,cls.meth)))

(:attribute-read `(let ((x (make-instance 'py-writable-attribute-method

:func (function ,cls.meth))))

(setf (gethash ',cls.meth *writable-attribute-methods*) x)

x))

(:attribute-write `(let ((f (function ,func-name))

(read-f (or (gethash ',cls.meth

*writable-attribute-methods*)

(error "Attribute read function ~A not defined yet"

',cls.meth))))

(setf (slot-value read-f 'write-func) f)

read-f ;; read function is already stored in dict

))))))))

(defun register-method (cls-name attr val)

(check-type attr symbol)

(let* ((cls (or (find-class cls-name) (error "No such class: ~A" cls-name))))

(assert (typep cls 'dict-mixin))

(class.raw-attr-set cls attr val)))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;;;

;;; dynamic class creation

(defun make-py-class (&rest args)

(declare (dynamic-extent args))

(multiple-value-bind (cls kind)

(apply #'make-py-class-1 args)

(assert (member kind '(:metaclass :class :condition)))

cls))

(defun apply-namespace-to-cls (namespace cls)

(assert (eq-hash-table-p namespace)) ;; may not hold when using __prepare__ etc

(loop for key being each hash-key in namespace

using (hash-value val)

do (assert (symbolp key))

(class.raw-attr-set cls key val)))

(defun make-py-class-1 (&key name context-name namespace supers cls-metaclass mod-metaclass)

(declare (ignore context-name)) ;; XXX for now

(flet ((make-condition-exception ()

(assert (not *exceptions-are-python-objects*))

(values (let ((cond-class-name (apply #'define-exception-subclass

name (mapcar 'class-name supers))))

(check-type cond-class-name class)

cond-class-name)

:condition)))

#+(or)(assert (symbolp name))

#+(or)(assert (listp supers))

#+(or)(assert (typep namespace 'dict))

;; XXX is this a true restriction? Custom metaclasses may allow

;; more kinds of `bases' in their __new__(...) ?

;; either:

;; 1) all supers are subtype of 'py-type (to create a new metaclass)

;; 2) all supers are subtype of 'object (to create new "regular user-level" class)

(flet ((of-type-class (s) (typep s 'class))

(subclass-of-py-dl-object-p (s) (subtypep s (ltv-find-class 'object)))

(subclass-of-py-type-p (s) (subtypep s (ltv-find-class 'py-type))))

(unless (every #'of-type-class supers)

(py-raise '{TypeError} "Not all superclasses are classes (got: ~A)." supers))

;; Handle the case where exceptions are not Python object instances.

(when (and (not *exceptions-are-python-objects*)

(loop for s in supers thereis (subtypep s 'condition)))

(unless (loop for s in supers always (subtypep s 'condition))

(py-raise '{TypeError}

"Unsupported heterogeneous superclasses: some CONDITION, some not: ~A." supers))

(return-from make-py-class-1 (make-condition-exception)))

(loop for s in supers

unless (or (subclass-of-py-type-p s)

(subclass-of-py-dl-object-p s))

do (error "BUG? Superclass ~A is neither sub of 'type nor sub of 'object~@[~A~]!"

s (unless *exceptions-are-python-objects* " not a subtype of 'condition")))

#+(or)

(let ((core-supers (remove-if-not (lambda (s) (typep s 'py-type)) supers)))

(when core-supers

(py-raise '{TypeError} "Cannot subclass from these classes: ~A" core-supers)))

(when (and (some #'subclass-of-py-type-p supers)

(some #'subclass-of-py-dl-object-p supers))

(py-raise 'TypeError "Superclasses are at different levels (some metaclass, ~

some regular class) (got: ~A)." supers))

(let ((metaclass (or cls-metaclass

(when supers (class-of (car supers)))

mod-metaclass

(ltv-find-class 'py-type))))

#+(or)(warn "metaclass: ~A" metaclass)

(unless (typep metaclass 'class)

(py-raise '{TypeError} "Metaclass must be a class (got: ~A)" metaclass))

(unless (or (eq metaclass (ltv-find-class 'py-meta-type))

(subtypep metaclass (ltv-find-class 'py-type)))

(py-raise '{TypeError}

"Metaclass must be subclass of `type' (got class: ~A)" metaclass))

;; When inheriting from py-lisp-type (like `int'), use

;; py-meta-type as metaclass.

(when (or (eq metaclass (ltv-find-class 'py-lisp-type))

#+(or)(eq metaclass (ltv-find-class 'py-type)))

(setf metaclass (ltv-find-class 'py-type)))

#+(or)(warn "metaclass 2: ~A" metaclass)

;; Subclass of `type' has metaclass 'py-meta-type

(when (eq metaclass (ltv-find-class 'py-meta-type))

(let ((cls (ensure-class

(make-symbol (symbol-name name))

:direct-superclasses supers

:metaclass (ltv-find-class 'py-meta-type)

#+(or):dict #+(or)namespace)))

(apply-namespace-to-cls namespace cls)

(return-from make-py-class-1 (values cls :metaclass))))

;; Not a subclass of `type', so at the `object' level

(let ((__new__ (class.attr-no-magic metaclass '{__new__})))

(assert __new__ ()

"recur: no __new__ found for class ~A, yet it is a subclass of PY-TYPE ?!" metaclass)

#+(or)(warn "binding __new__: ~A ~A" __new__ metaclass)

(let ((cls (if (and (eq (class-of __new__) (ltv-find-class 'py-static-method))

(eq (py-method-func __new__) (symbol-function 'py-type.__new__)))

;; Optimize common case: py-type.__new__

(progn

#+(or)(warn "Inlining make-py-class")

(py-type.__new__ metaclass

(string name)

supers ;; MAKE-TUPLE-FROM-LIST not needed

namespace))

(let ((bound-_new_ (bind-val __new__ metaclass (py-class-of metaclass))))

;; If __new__ is a static method, then bound-_new_ will

;; be the underlying function.

(or (py-call bound-_new_ metaclass

(string name)

(make-tuple-from-list supers) ;; ensure not NIL

namespace)

(error "Class' bound __new__ returned NIL: ~A" bound-_new_))))))

;; Call __init__ when the "thing" returned by

;; <metaclass>.__new__ is of type <metaclass>.

(if (typep cls metaclass)

(let ((__init__ (class.attr-no-magic metaclass '{__init__})))

#+(or)(warn " __init__ method ~A is: ~A" metaclass __init__)

(when __init__

(py-call __init__ cls)))

#+(or)(warn "Not calling __init__ method, as class ~A is not instance of metaclass ~A"

cls metaclass))

(values cls :class)))))))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

(defconstant +the-true+ 1)

(defconstant +the-false+ 0)

(defun py-bool (lisp-val)

(if lisp-val +the-true+ +the-false+))

(define-compiler-macro py-bool (lisp-val)

`(if ,lisp-val +the-true+ +the-false+))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;;;

;;; Built-in Python object types:

;;;

;;; -- type ----------- repr ----- subclassable -- examples -------------------

;;; py-lisp-object: lisp value yes number, string, tuples, vectors, dict

;;; object: py cls inst no function, method

;;; dicted-object: py cls inst yes file, module, property

;;;

;; (defun f (&rest args)

;; (with-parsed-py-arglist ((a b) args)

;; (+ a b)))

;;

;; (f 1 2) (f 1 :b 2) (f :a 1 :b 2)

(defmacro with-parsed-py-arglist ((formal-args actual-args) &body body)

(let ((alist '#:alist))

`(let* ((,alist (parse-poskey-arglist ',formal-args ,actual-args))

,@(loop for f in formal-args

collect `(,f (cdr (assoc ',f ,alist :test #'eq)))))

,@body)))

(defun parse-poskey-arglist (formal-args actual-args)

(setf formal-args (copy-list formal-args))

(let (res)

;; handle all actual positional args

(loop while (and formal-args actual-args (not (symbolp (car actual-args))))

do (push (cons (pop formal-args) (pop actual-args)) res))

;; handle remaining keyword arguments

(loop while actual-args

for key = (pop actual-args)

do (cond ((keywordp key)

(let ((formal-keyword-arg (or (find key formal-args :test 'string-equal)

;; FIXME case issue; (string= |:a| '|a|)

(py-raise '{ValueError} "Invalid keyword argument supplied: ~S." key))))

(push (cons formal-keyword-arg (pop actual-args)) res)

(setf formal-args (delete formal-keyword-arg formal-args :test 'eq))))

(t

(py-raise '{ValueError} "Invalid positional arguement supplied: ~S." key))))

res))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;;;

;;; Core objects (function, method, None...; not subclassable by the user)

;;;

(def-py-method py-type.__class__ :attribute (x)

(py-class-of x))

;; py-class-method

(def-py-method py-class-method.__new__ :static (cls func)

(make-instance cls))

(defun classp (x)

(checking-reader-conditionals

#+allegro (excl::classp x)

#+cmu (pcl::classp x)

#+lispworks (clos::classp x)

#+sbcl (sb-pcl::classp x)

#-(or allegro cmu lispworks sbcl) (typep x 'class)))

(def-py-method py-class-method.__get__ (x inst class)

(let ((arg (if (classp inst) inst (py-class-of inst))))

(make-instance 'py-bound-method

:func (slot-value x 'func)

:instance arg)))

(def-py-method py-class-method.__init__ (x^ func)

(setf (slot-value x 'func) func))

(def-py-method py-class-method.__call__ (x^ &rest args)

(error "todo")

#+(or)(apply #'py-call (py-method-func x) (slot-value x 'instance) args)

#+(or)

(let ((arg (if (classp obj) obj (py-class-of obj))))

(apply #'py-call (py-method-func x) arg args)))

;; py-attribute-method

(def-py-method py-attribute-method.__get__ (x inst class)

(if (and inst (not (none-p inst)))

(py-call (slot-value x 'func) inst)

nil))

(def-py-method py-attribute-method.__set__ (x obj val)

(py-raise '{TypeError}

"Attribute ~A of object ~A is read-only (value: ~A)"

x obj (py-call (slot-value x 'func) obj)))

(def-py-method py-attribute-method.__repr__ (x)

(with-output-to-string (s)

(print-unreadable-object (x s :type t :identity t))))

;; py-class-attribute-method

(def-py-method py-class-attribute-method.__get__ (x inst class)

(unless (classp inst)

(error "py-class-attribute-method.__get__ wants class instance as first arg! ~A ~A ~A"

x inst class))

(py-call (slot-value x 'func) inst))

;; py-writable-attribute-method

(def-py-method py-writable-attribute-method.__set__ (x obj val)

(if (slot-boundp x 'write-func)

(py-call (slot-value x 'write-func) obj val)

(error "No writer defined for writable attribute: ~A" x)))

(def-py-method py-writable-attribute-method.__get__ (x inst class)

(if (and inst (not (none-p inst)))

(py-call (slot-value x 'func) inst)

nil))

(defclass py-bound-method (py-method)

((instance :initarg :instance :accessor py-method-instance))

(:metaclass py-type))

(defmethod print-object ((x py-bound-method) stream)

(print-unreadable-object (x stream :identity t :type nil)

(with-slots (instance func) x

(format stream "bound-method ~A on the ~A ~A"

(py-function-name func)

(class-name (py-class-of instance))

instance))))

(def-py-method py-bound-method.__repr__ (x)

(with-output-to-string (s)

(print-object x s)))

(def-py-method py-bound-method.__call__ (x &rest args)

(when (and (null (cdr args))

(eq (car args) '{__dict__}))

#+(or)(warn "pym.c args: ~A ~A" x args))

(with-slots (func instance) x

(if (functionp func)

(apply (the function func) instance args)

(apply #'py-call func instance args))))

(def-py-method py-bound-method.__get__ (x &rest args)

;; Somewhat surprisingly, when a bound method is __get__ again, the

;; underlying function is bound again:

;;

;; >>> class C:

;; ... def m(self): pass

;; ...

;; >>> x,y = C(), C()

;; >>> m = x.m

;; >>> m

;; <bound method C.m of <__main__.C instance at 0x4021e8ec>>

;; >>> m2 = m.__get__(y,C)

;; >>> m2

;; <bound method C.m of <__main__.C instance at 0x4021e92c>>

;; >>> x

;; <__main__.C instance at 0x4021e8ec>

;; >>> y

;; <__main__.C instance at 0x4021e92c>

(apply #'py-call (x.class-attr-no-magic.bind (py-method-func x) '{__get__}) args))

(def-py-method py-bound-method.__name__ :attribute (x)

(py-bound-method.__repr__ x))

(defclass py-unbound-method (py-method)

((class :initarg :class :accessor py-method-class))

(:metaclass py-type))

(def-py-method py-unbound-method.__repr__ (x)

(with-output-to-string (s)

(print-object x s)))

(defmethod print-object ((x py-unbound-method) stream)

(print-unreadable-object (x stream :identity t :type nil)

(with-slots (class func) x

(format stream "unbound-method ~A on class ~A"

(py-function-name func)

(class-name class)))))

(def-py-method py-unbound-method.__call__ (x &rest args)

(with-slots (func) x

(apply #'py-call func args)))

(def-py-method py-unbound-method.__get__ (x &rest args)

;; same as py-bound-method.__get__ ?!

(apply #'py-call (x.class-attr-no-magic.bind (py-method-func x) '{__get__}) args))

;; py-static-method

(def-py-method py-static-method.__new__ :static (cls func)

(assert (eq cls (ltv-find-class 'py-static-method)))

(make-instance 'py-static-method :func func))

(def-py-method py-static-method.__get__ (x inst class)

(slot-value x 'func))

(def-py-method py-static-method.__repr__ (x)

(with-output-to-string (s)

(print-unreadable-object (x s :identity t)

(format s "the static method ~A" (slot-value x 'func)))))

(def-py-method py-static-method.__call__ (x &rest args)

(apply #'py-call (slot-value x 'func) args))

(defmethod print-object ((x py-static-method) stream)

(print-unreadable-object (x stream :identity t :type t)

(format stream ":func ~A" (slot-value x 'func))))

;; Function (Core object)

(defclass py-lisp-function (object)

()

(:metaclass py-type))

(finalize-inheritance (find-class 'py-lisp-function))

(def-py-method py-lisp-function.__repr__ (func)

(with-output-to-string (s)

(print-object func s)))

(def-py-method py-lisp-function.__get__ (func inst cls)

(assert inst)

(let ((to-make (cond ((none-p inst)

(if (and (typep cls 'class)

(eq (class-name cls) 'py-none))

:bound-method

:unbound-method))

((none-p cls)

(py-raise '{ValueError}

"function.__get__(None, None) : invalid args"))

(t

:bound-method))))

(ecase to-make

(:bound-method (make-instance 'py-bound-method :instance inst :func func))

(:unbound-method (make-instance 'py-unbound-method :class cls :func func)))))

(def-py-method py-lisp-function.__name__ :attribute (func)

(function-name func))

(defclass funcallable-python-class (closer-mop:funcallable-standard-class py-type)

()

(:metaclass py-meta-type))

(defmethod closer-mop:validate-superclass ((class funcallable-python-class) superclass)

(declare (ignorable class superclass))

t)

;; Temporary (?) hack to get things running on SBCL 1.0.16,

;; where instantiating a py-function leads to strange errors.

;; See <http://common-lisp.net/pipermail/clpython-devel/2008-May/000048.html>

(defparameter *create-simple-lambdas-for-python-functions*

(checking-reader-conditionals

#+(or allegro lispworks) nil

#+sbcl t

#-(or allegro lispworks sbcl) t)

"Whether Python function are real CLOS funcallable instances, or just normal lambdas.

Note that in the latter case, functions miss their name and attribute dict, but should

otherwise work well.")

(defstruct (simple-function-data (:conc-name sfd-))

func name attributes func-globals func-code)

(defparameter *simple-function-data* (make-hash-table :test 'eq)

"Mapping from function to SIMPLE-FUNCTION-DATA")

(defun register-simple-function (func name func-globals func-code)

(setf (gethash func *simple-function-data*)

(make-simple-function-data :func func

:name name

:attributes (make-hash-table :test 'eq)

:func-globals func-globals

:func-code func-code)))

(defgeneric py-function-lambda (x)

;; XXX this function is also used when *create-simple-lambdas-for-python-functions*

;; which is not quite kosher.

(:method ((x function)) x))

(defclass py-function (standard-generic-function dicted-object)

;; mop:funcallable-standard-class defines :name initarg, but how to to access it portably...

((fname :initarg :fname :initform nil :accessor py-function-name)

(context-name :initarg :context-name :initform nil :accessor py-function-context-name)

(lambda :initarg :lambda :initform nil :accessor py-function-lambda)

(func-globals :initarg :func-globals :accessor py-function-func-globals)

(func-code :initarg :func-code :reader py-function-code)

(module-name :initarg :module-name :accessor py-function.module-name))

(:metaclass funcallable-python-class))

;; XXX On LispWorks this is not guaranteed to work:

;; http://article.gmane.org/gmane.lisp.lispworks.general/8999

;; Maybe switch to simple lambda's there too?

(defun set-funcallable-instance-function (inst func)

(closer-mop:set-funcallable-instance-function inst func))

(defgeneric function-name (f)

(:method ((f function))

(let ((data (gethash f *simple-function-data*)))

(when data

(string (sfd-name data)))))

(:method ((f py-function)) (string (py-function-name f))))

(defun make-py-function (&key name context-name lambda func-globals func-code module-name)

(if *create-simple-lambdas-for-python-functions*

(progn (register-simple-function lambda name func-globals func-code)

lambda)

(progn (when name (check-type name symbol))

(when context-name (check-type context-name (or symbol string)))

(when module-name (check-type module-name string))

(let ((x (make-instance 'py-function

:fname (string name)

:lambda lambda

:context-name context-name

:func-globals func-globals

:func-code func-code

:module-name module-name)))

(set-funcallable-instance-function x lambda)

;; fill dict?

x))))

(def-py-method py-function.__get__ (func inst cls)

(py-lisp-function.__get__ func inst cls))

(def-py-method py-function.__hash__ (func)

(sxhash func))

(def-py-method py-function.__repr__ (func)

(with-output-to-string (s)

(if (typep func 'py-function)

(print-object func s)

(format s "~A" (or (function-name func) func)))))

(def-py-method py-function.__module__ :attribute-read (x)

(py-function.module-name x))

(def-py-method py-function.__module__ :attribute-write (x name)

(check-type name string)

(setf (py-function.module-name x) name))

(defmethod print-object ((x py-function) stream)

(print-unreadable-object (x stream :identity t)

(format stream "python-function ~A~@[ (~A)~]"

(py-function-name x)

(unless (compiled-function-p (py-function-lambda x)) "interpreted"))

(when (string/= (py-function-name x)

(py-function-context-name x))

(format stream " (~A)" (py-function-context-name x)))))

(def-py-method py-function.__name__ :attribute-read (func)

(or (and (typep func 'py-function)

(py-function-name func))

(whereas ((data (gethash func *simple-function-data*)))

(or (whereas ((ht (sfd-attributes data))

(name (gethash '{__name__} ht)))

(string name))

(string (sfd-name data))))

(py-raise '{AttributeError} "Function ~A has no attribute `__name__'." func)))

(def-py-method py-function.__name__ :attribute-write (func name)

(if (typep func 'py-function)

(setf (py-function-name func) name)

(or (whereas ((data (gethash func *simple-function-data*)))

(setf (sfd-name data) name))

(py-raise '{AttributeError} "Cannot set attribute `__name__' of ~A." func))))

(def-py-method py-function._fif :attribute (x)

"The funcallable instance function of X."

;; CLPython-specific.

(when (typep x 'py-function)

(setf x (py-function-lambda x)))

(assert (functionp x))

x)

(def-py-method py-function.func_globals :attribute-read (x)

(etypecase x

(py-function (py-function-func-globals x))

(function (sfd-func-globals (or (gethash x *simple-function-data*)

(error "No function metadata available"))))))

(def-py-method py-function.__setattr__ (func attr val)

(when (stringp attr)

(setf attr (ensure-user-symbol attr)))

(check-type attr symbol)

(when (eq attr '{__dict__})

(when (typep val 'symbol-hash-table)

(setf val (sht-ht val)))

(check-type val hash-table) ;; XXX or custom ht

(let ((ht (make-eq-hash-table)))

(loop for key being the hash-key in val

using (hash-value value)

for key.sym = (typecase key

(symbol key)

(string (ensure-user-symbol key))

(t (py-raise '{TypeError} "Invalid key of type ~A in replacement dict (key: ~A)."

(type-of key) key)))

do (setf (gethash key.sym ht) value))

(etypecase func

(py-function (setf (dict func) ht))

(function (let ((data (gethash func *simple-function-data*)))

(setf (sfd-attributes data) ht)))))

(return-from py-function.__setattr__))

(etypecase func

(py-function (progn (let ((meth (funky-dict-get (dict (find-class 'py-function)) attr)))

(when (typep meth 'py-writable-attribute-method)

(return-from py-function.__setattr__

(py-writable-attribute-method.__set__ meth func val))))

(let ((d (or (dict func) (setf (dict func) (make-eq-hash-table)))))

(setf (gethash attr d) val))))

(function (let ((ht (whereas ((data (gethash func *simple-function-data*)))

(or (sfd-attributes data)

(setf (sfd-attributes data) (make-eq-hash-table))))))

(unless ht

(py-raise '{AttributeError} "Cannot set attribute on function ~A." func))

(setf (gethash attr ht) val)))))

(def-py-method py-function.__getattribute__ (func attr)

(when (stringp attr)

(setf attr (ensure-user-symbol attr)))

(check-type attr symbol)

(whereas ((val (funky-dict-get (dict (find-class 'py-function)) attr)))

(return-from py-function.__getattribute__

(bind-val val func (find-class 'py-function))))

(or (etypecase func

(py-function (whereas ((d (or (dict func)

(and (eq attr '{__dict__})

(setf (dict func) (make-eq-hash-table))))))

(if (eq attr '{__dict__})

(make-symbol-hash-table d)

(values (gethash attr d)))))

(function (whereas ((data (gethash func *simple-function-data*))

(ht (or (sfd-attributes data)

(and (eq attr '{__dict__})

(setf (sfd-attributes data) (make-eq-hash-table))))))

(if (eq attr '{__dict__})

(make-symbol-hash-table ht)

(values (gethash attr ht))))))

(py-raise '{AttributeError} "Function ~A has no attribute `~A'." func attr)))

(def-py-method py-function.__delattr__ (func attr)

(when (stringp attr)

(setf attr (ensure-user-symbol attr)))

(check-type attr symbol)

(assert (not (eq attr '{__dict__})) () "Error: todo: function delattr of __dict__")

(let ((ok (etypecase func

(py-function (whereas ((d (dict func)))

(setf (py-subs d attr) nil)))

(function (whereas ((data (gethash func *simple-function-data*))

(ht (sfd-attributes data)))

(remhash attr ht))))))

(unless ok

(py-raise '{AttributeError} "Function ~A has no attribute `~A' to delete." func attr))))

(declaim (special *the-empty-tuple*))

(defclass func-code (clpython:object)

((name :type string :initarg :name :reader func-code.name :initform "")

(arg-count :type (integer 0) :initarg :arg-count :reader func-code.arg-count :initform 0)

(nlocals :type (integer 0) :initarg :nlocals :reader func-code.nlocals :initform 0)

(varnames :type #1=(or py-tuple list) :initarg :varnames :reader func-code.varnames :initform *the-empty-tuple*)

(cellvars :type #1# :initarg :cellvars :reader func-code.cellvars :initform *the-empty-tuple*)

(freevars :type #1# :initarg :freevars :reader func-code.freevars :initform *the-empty-tuple*)

(code :type string :initarg :code :reader func-code.code :initform "")

(consts :type #1# :initarg :consts :reader func-code.consts :initform *the-empty-tuple*)

(names :type #1# :initarg :names :reader func-code.names :initform *the-empty-tuple*)

(filename :type string :initarg :filename :reader func-code.filename :initform "")

(lnotab :type string :initarg :lnotab :reader func-code.lnotab :initform "")

(stacksize :type (integer 0) :initarg :stacksize :reader func-code.stacksize :initform 0)

(flags :type (integer 0) :initarg :flags :reader func-code.flags :initform 0))

(:metaclass clpython:py-type))

(def-py-method py-function.func_code :attribute (x)

"Read-only attribute: the underlying lambda. (In CPython the bytecode vector.)"

(etypecase x

(py-function (py-function-code x))

(function (sfd-func-code (or (gethash x *simple-function-data*)

(error "No function metadata available"))))))

(progn (def-py-method func-code.co_name :attribute (x) (func-code.name x))

(def-py-method func-code.co_argcount :attribute (x) (func-code.arg-count x))

(def-py-method func-code.co_nlocals :attribute (x) (func-code.nlocals x))

(def-py-method func-code.co_varnames :attribute (x) (func-code.varnames x))

(def-py-method func-code.co_cellvars :attribute (x) (func-code.cellvars x))

(def-py-method func-code.co_freevars :attribute (x) (func-code.freevars x))

(def-py-method func-code.co_code :attribute (x) (func-code.code x))

(def-py-method func-code.co_consts :attribute (x) (func-code.consts x))

(def-py-method func-code.co_names :attribute (x) (func-code.names x))

(def-py-method func-code.co_filename :attribute (x) (func-code.filename x))

(def-py-method func-code.co_lnotab :attribute (x) (func-code.lnotab x))

(def-py-method func-code.co_stacksize :attribute (x) (func-code.stacksize x))

(def-py-method func-code.co_flags :attribute (x) (func-code.flags x)))

(def-py-method py-function._dis :attribute (x)

;; CLPython-specific attribute, to ease debugging.

;;

;; Calling DISASSEMBLE directly on X will print (at least) two functions:

;; - the instructions that load and call the funcallable instance function

;; - the instructions of the funcallable instance function

;; The first is not very interesting imho.

;;

;; DISASSEMBLE accepts fbound symbols or lambda expressions, according to the spec.

;; It might thus be Allegro-specific that its DISASSEMBLE accepts a function object.

(when (typep x 'py-function)

(setf x (py-function-lambda x)))

(eval `(disassemble ,x)))

#+clpython-source-level-debugging

(def-py-method py-function._src :attribute (x)

(when (typep x 'py-function)

(setf x (py-function-lambda x)))

(when (excl::closurep x) ;; needed?

(setq x (excl::cl_shared x)))

(let ((*print-level* 2))

(excl::dump-lisp-source x)))

(defmethod py-function-name ((x function))

(declare (ignorable x))

#+allegro (format nil "~A" (excl::func_name x))

#-allegro (call-next-method))

(defmethod py-function-name ((x t))

;; fall-back

(format nil "~A" x))

(def-py-method py-function.__call__ (func &rest args)

(apply func args))

(defun function-arglist (f)

(check-type f function)

#+allegro (excl:arglist f)

#-allegro nil)

(def-py-method py-function.__doc__ :attribute-read (func^)

(let ((fname (py-function-name func))

(arglist (function-arglist func))

(documentation (documentation func 'function)))

(with-output-to-string (s)

(when fname (write-string fname s))

(format s "~A" (or arglist "(unknown args)"))

(when (and documentation (or fname arglist))

(terpri s))

(when documentation (write-string documentation s)))))

(def-py-method py-function.__doc__ :attribute-write (func^ doc)

(setf (documentation func 'function) doc))

;; Enumerate (core object)

(defclass py-enumerate (object)

((gener :initarg :gener))

(:metaclass py-type))

(finalize-inheritance (find-class 'py-enumerate))

(def-py-method py-enumerate.__new__ :static (cls iterable)

#+(or)(assert (subtypep cls 'py-enumerate))

(let ((gener (make-iterator-from-function

:name :enumerater

:func (let ((iter (get-py-iterate-fun iterable))

(i 0))

(lambda ()

(let ((val (funcall iter)))

(when val

(prog1

(make-tuple-from-list (list i val))

(incf i)))))))))

(make-instance cls :gener gener)))

(def-py-method py-enumerate.__repr__ (x)

(with-output-to-string (s)

(print-unreadable-object (x s :identity t :type t))))

(def-py-method py-enumerate.__iter__ (x)

(slot-value x 'gener))

(defclass py-slice (object)

((start :initarg :start :accessor slice-start)

(stop :initarg :stop :accessor slice-stop)

(step :initarg :step :accessor slice-step))

(:metaclass py-type))

(defmethod print-object ((x py-slice) stream)

(print-unreadable-object (x stream)

(with-slots (start stop step) x

(format stream ":start ~A :stop ~A :step ~A"

start stop step))))

(defun make-slice (start stop step)

(make-instance 'py-slice

:start (or start (load-time-value *the-none*))

:stop (or stop (load-time-value *the-none*))

:step (or step (load-time-value *the-none*))))

(def-py-method py-slice.indices (x^ length^)

"Return tuple of three integers: START, STOP, STEP.

In case of empty range, returns (0,0,1)."

(setf length (py-val->integer length :min 0))

(multiple-value-bind (start stop step)

(destructuring-bind (kind &rest args)

(slice-indices x length)

(ecase kind

((:empty-slice-bogus :empty-slice-before :empty-slice-after :empty-slice-between)

(values 0 0 1))

(:nonempty-slice

(destructuring-bind (start stop num) args

(declare (ignore num))

(values start (1+ stop) 1)))

(:nonempty-stepped-slice

(destructuring-bind (start stop step num) args

(declare (ignore num))

(values start stop step)))))

(make-tuple-from-list (list start stop step))))

;; XXX THis comment ignores fourth value for extended stepped slices

;;

;; Function SLICE-INDICES returns multiple values, best explained by example:

;; Assume x = [0,1,2] so LENGTH = 3

;;

;; -slice- -extr- -assignment- -values-

;; x[:0] [] x[:0] = [42] => [42,0,1,2] :empty-slice-before

;; x[3:] [] x[3:] = [42] => [0,1,2,42] :empty-slice-after

;; x[1:1] [] x[1:1] = [42]=> [0,42,1,2] :empty-slice-between 0 1 = BEFORE-I, AFTER-I

;; x[1:2] [1] x[1:2] = [42]=> [0,42,2] :nonempty-slice 1 1 = FIRST-I, LAST-I

;; x[1:] [1,2] x[1:] = [42] => [0,42] :nonempty-slice 1 2

;; x[:1] [0] x[:1] = [42] => [42,1 2] :nonempty-slice 0 0

;; x[:] [0,1,2](copy) x[:] = [42] => [42](modifies) :nonempty-slice 0 2

;; x[2:1] [] (error) :empty-slice-bogus

;; x[100:200] [] :empty-slice-bogus

;;

;; These have implicit step=1. Other steps result in a `stepped-slice'

;; Now with other step values, using x = range(10) = [0,1,2,3,4,5,6,7,8,9] so LENGTH = 10

;;

;; -slice- -extr- -assignment- -values-

;; x[::0] - - - - - step=0 is error - - - - - - - - - - - - - - - -

;; x[::2] [0,2,4,6,8] :extended-slice 0 9 2 = FIRST LAST STEP

;; x[::-2] [9,7,5,4,1] x[..] = [1,2,3,4,5] => :nonempty-stepped-slice 9 1 -2

;; [0, 5, 2, 4, 4, 3, 6, 2, 8, 1]

;; x[0:2:-1] [] (error) (error)

;; x[100:200:2] [] (error) :empty-slice-bogus