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;;;; -------------------------------------------------------------------------
;;;; Components

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(uiop/package:define-package :asdf/component
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  (:recycle :asdf/component :asdf/defsystem :asdf/find-system :asdf)
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  (:use :uiop/common-lisp :uiop :asdf/upgrade)
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  (:export
   #:component #:component-find-path
   #:component-name #:component-pathname #:component-relative-pathname
   #:component-parent #:component-system #:component-parent-pathname
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   #:child-component #:parent-component #:module
   #:file-component
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   #:source-file #:c-source-file #:java-source-file
   #:static-file #:doc-file #:html-file
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   #:file-type
   #:source-file-type #:source-file-explicit-type ;; backward-compatibility
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   #:component-in-order-to #:component-sideway-dependencies
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   #:component-if-feature #:around-compile-hook
   #:component-description #:component-long-description
   #:component-version #:version-satisfies
   #:component-inline-methods ;; backward-compatibility only. DO NOT USE!
   #:component-operation-times ;; For internal use only.
   ;; portable ASDF encoding and implementation-specific external-format
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   #:component-external-format #:component-encoding
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   #:component-children-by-name #:component-children #:compute-children-by-name
   #:component-build-operation
   #:module-default-component-class
   #:module-components ;; backward-compatibility. DO NOT USE.
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   #:sub-components
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   ;; conditions
   #:system-definition-error ;; top level, moved here because this is the earliest place for it.
   #:duplicate-names

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   ;; Internals we'd like to share with the ASDF package, especially for upgrade purposes
   #:name #:version #:description #:long-description #:author #:maintainer #:licence
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   #:components-by-name #:components
   #:children #:children-by-name #:default-component-class
   #:author #:maintainer #:licence #:source-file #:defsystem-depends-on
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   #:sideway-dependencies #:if-feature #:in-order-to #:inline-methods
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   #:relative-pathname #:absolute-pathname #:operation-times #:around-compile
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   #:%encoding #:properties #:component-properties #:parent))
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(in-package :asdf/component)

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(with-upgradability ()
  (defgeneric component-name (component)
    (:documentation "Name of the COMPONENT, unique relative to its parent"))
  (defgeneric component-system (component)
    (:documentation "Find the top-level system containing COMPONENT"))
  (defgeneric component-pathname (component)
    (:documentation "Extracts the pathname applicable for a particular component."))
  (defgeneric (component-relative-pathname) (component)
    (:documentation "Returns a pathname for the component argument intended to be
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interpreted relative to the pathname of that component's parent.
Despite the function's name, the return value may be an absolute
pathname, because an absolute pathname may be interpreted relative to
another pathname in a degenerate way."))
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  (defgeneric component-external-format (component))
  (defgeneric component-encoding (component))
  (defgeneric version-satisfies (component version))
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  (defgeneric component-version (component))
  (defgeneric (setf component-version) (new-version component))
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  (defgeneric component-parent (component))
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  (defmethod component-parent ((component null)) nil)
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  ;; Backward compatible way of computing the FILE-TYPE of a component.
  ;; TODO: find users, have them stop using that, remove it for ASDF4.
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  (defgeneric (source-file-type) (component system))

  (define-condition system-definition-error (error) ()
    ;; [this use of :report should be redundant, but unfortunately it's not.
    ;; cmucl's lisp::output-instance prefers the kernel:slot-class-print-function
    ;; over print-object; this is always conditions::%print-condition for
    ;; condition objects, which in turn does inheritance of :report options at
    ;; run-time.  fortunately, inheritance means we only need this kludge here in
    ;; order to fix all conditions that build on it.  -- rgr, 28-Jul-02.]
    #+cmu (:report print-object))

  (define-condition duplicate-names (system-definition-error)
    ((name :initarg :name :reader duplicate-names-name))
    (:report (lambda (c s)
               (format s (compatfmt "~@<Error while defining system: multiple components are given same name ~S~@:>")
                       (duplicate-names-name c))))))


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(with-upgradability ()
  (defclass component ()
    ((name :accessor component-name :initarg :name :type string :documentation
           "Component name: designator for a string composed of portable pathname characters")
     ;; We might want to constrain version with
     ;; :type (and string (satisfies parse-version))
     ;; but we cannot until we fix all systems that don't use it correctly!
     (version :accessor component-version :initarg :version :initform nil)
     (description :accessor component-description :initarg :description :initform nil)
     (long-description :accessor component-long-description :initarg :long-description :initform nil)
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     (sideway-dependencies :accessor component-sideway-dependencies :initform nil)
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     (if-feature :accessor component-if-feature :initform nil :initarg :if-feature)
     ;; In the ASDF object model, dependencies exist between *actions*,
     ;; where an action is a pair of an operation and a component.
     ;; Dependencies are represented as alists of operations
     ;; to a list where each entry is a pair of an operation and a list of component specifiers.
     ;; Up until ASDF 2.26.9, there used to be two kinds of dependencies:
     ;; in-order-to and do-first, each stored in its own slot. Now there is only in-order-to.
     ;; in-order-to used to represent things that modify the filesystem (such as compiling a fasl)
     ;; and do-first things that modify the current image (such as loading a fasl).
     ;; These are now unified because we now correctly propagate timestamps between dependencies.
     ;; Happily, no one seems to have used do-first too much (especially since until ASDF 2.017,
     ;; anything you specified was overridden by ASDF itself anyway), but the name in-order-to remains.
     ;; The names are bad, but they have been the official API since Dan Barlow's ASDF 1.52!
     ;; LispWorks's defsystem has caused-by and requires for in-order-to and do-first respectively.
     ;; Maybe rename the slots in ASDF? But that's not very backward-compatible.
     ;; See our ASDF 2 paper for more complete explanations.
     (in-order-to :initform nil :initarg :in-order-to
                  :accessor component-in-order-to)
     ;; methods defined using the "inline" style inside a defsystem form:
     ;; need to store them somewhere so we can delete them when the system
     ;; is re-evaluated.
     (inline-methods :accessor component-inline-methods :initform nil) ;; OBSOLETE! DELETE THIS IF NO ONE USES.
     ;; ASDF4: rename it from relative-pathname to specified-pathname. It need not be relative.
     ;; There is no initform and no direct accessor for this specified pathname,
     ;; so we only access the information through appropriate methods, after it has been processed.
     ;; Unhappily, some braindead systems directly access the slot. Make them stop before ASDF4.
     (relative-pathname :initarg :pathname)
     ;; The absolute-pathname is computed based on relative-pathname and parent pathname.
     ;; The slot is but a cache used by component-pathname.
     (absolute-pathname)
     (operation-times :initform (make-hash-table)
                      :accessor component-operation-times)
     (around-compile :initarg :around-compile)
     ;; Properties are for backward-compatibility with ASDF2 only. DO NOT USE!
     (properties :accessor component-properties :initarg :properties
                 :initform nil)
     (%encoding :accessor %component-encoding :initform nil :initarg :encoding)
     ;; For backward-compatibility, this slot is part of component rather than of child-component. ASDF4: stop it.
     (parent :initarg :parent :initform nil :reader component-parent)
     (build-operation
      :initarg :build-operation :initform nil :reader component-build-operation)))

  (defun component-find-path (component)
    (check-type component (or null component))
    (reverse
     (loop :for c = component :then (component-parent c)
           :while c :collect (component-name c))))

  (defmethod print-object ((c component) stream)
    (print-unreadable-object (c stream :type t :identity nil)
      (format stream "~{~S~^ ~}" (component-find-path c))))

  (defmethod component-system ((component component))
    (if-let (system (component-parent component))
      (component-system system)
      component)))
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;;;; Component hierarchy within a system
;; The tree typically but not necessarily follows the filesystem hierarchy.
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(with-upgradability ()
  (defclass child-component (component) ())

  (defclass file-component (child-component)
    ((type :accessor file-type :initarg :type))) ; no default
  (defclass source-file (file-component)
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    ((type :accessor source-file-explicit-type ;; backward-compatibility
           :initform nil))) ;; NB: many systems have come to rely on this default.
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  (defclass c-source-file (source-file)
    ((type :initform "c")))
  (defclass java-source-file (source-file)
    ((type :initform "java")))
  (defclass static-file (source-file)
    ((type :initform nil)))
  (defclass doc-file (static-file) ())
  (defclass html-file (doc-file)
    ((type :initform "html")))

  (defclass parent-component (component)
    ((children
      :initform nil
      :initarg :components
      :reader module-components ; backward-compatibility
      :accessor component-children)
     (children-by-name
      :reader module-components-by-name ; backward-compatibility
      :accessor component-children-by-name)
     (default-component-class
      :initform nil
      :initarg :default-component-class
      :accessor module-default-component-class))))

(with-upgradability ()
  (defun compute-children-by-name (parent &key only-if-needed-p)
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    (unless (and only-if-needed-p (slot-boundp parent 'children-by-name))
      (let ((hash (make-hash-table :test 'equal)))
        (setf (component-children-by-name parent) hash)
        (loop :for c :in (component-children parent)
              :for name = (component-name c)
              :for previous = (gethash name hash)
              :do (when previous (error 'duplicate-names :name name))
                  (setf (gethash name hash) c))
        hash))))

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(with-upgradability ()
  (defclass module (child-component parent-component)
    (#+clisp (components)))) ;; backward compatibility during upgrade only
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;;;; component pathnames
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(with-upgradability ()
  (defgeneric* (component-parent-pathname) (component))
  (defmethod component-parent-pathname (component)
    (component-pathname (component-parent component)))

  (defmethod component-pathname ((component component))
    (if (slot-boundp component 'absolute-pathname)
        (slot-value component 'absolute-pathname)
        (let ((pathname
                (merge-pathnames*
                 (component-relative-pathname component)
                 (pathname-directory-pathname (component-parent-pathname component)))))
          (unless (or (null pathname) (absolute-pathname-p pathname))
            (error (compatfmt "~@<Invalid relative pathname ~S for component ~S~@:>")
                   pathname (component-find-path component)))
          (setf (slot-value component 'absolute-pathname) pathname)
          pathname)))

  (defmethod component-relative-pathname ((component component))
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    ;; SOURCE-FILE-TYPE below is strictly for backward-compatibility with ASDF1.
    ;; We ought to be able to extract this from the component alone with COMPONENT-TYPE.
    ;; TODO: track who uses it, and have them not use it anymore;
    ;; maybe issue a WARNING (then eventually CERROR) if the two methods diverge?
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    (parse-unix-namestring
     (or (and (slot-boundp component 'relative-pathname)
              (slot-value component 'relative-pathname))
         (component-name component))
     :want-relative t
     :type (source-file-type component (component-system component))
     :defaults (component-parent-pathname component)))

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  (defmethod source-file-type ((component parent-component) (system parent-component))
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    :directory)

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  (defmethod source-file-type ((component file-component) (system parent-component))
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    (file-type component)))
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;;;; Encodings
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(with-upgradability ()
  (defmethod component-encoding ((c component))
    (or (loop :for x = c :then (component-parent x)
              :while x :thereis (%component-encoding x))
        (detect-encoding (component-pathname c))))
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  (defmethod component-external-format ((c component))
    (encoding-external-format (component-encoding c))))
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;;;; around-compile-hook
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(with-upgradability ()
  (defgeneric around-compile-hook (component))
  (defmethod around-compile-hook ((c component))
    (cond
      ((slot-boundp c 'around-compile)
       (slot-value c 'around-compile))
      ((component-parent c)
       (around-compile-hook (component-parent c))))))
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;;;; version-satisfies
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(with-upgradability ()
  (defmethod version-satisfies ((c component) version)
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    (unless (and version (slot-boundp c 'version) (component-version c))
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      (when version
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        (warn "Requested version ~S but ~S has no version" version c))
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      (return-from version-satisfies t))
    (version-satisfies (component-version c) version))
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  (defmethod version-satisfies ((cver string) version)
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    (version<= version cver)))
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;;; all sub-components (of a given type)
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(with-upgradability ()
  (defun sub-components (component &key (type t))
    (while-collecting (c)
      (labels ((recurse (x)
                 (when (if-let (it (component-if-feature x)) (featurep it) t)
                   (when (typep x type)
                     (c x))
                   (when (typep x 'parent-component)
                     (map () #'recurse (component-children x))))))
        (recurse component)))))
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