/
w3m-util.el
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w3m-util.el
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;;; w3m-util.el --- Utility macros and functions for emacs-w3m -*- coding: utf-8; -*-
;; Copyright (C) 2001-2014, 2016-2018 TSUCHIYA Masatoshi <tsuchiya@namazu.org>
;; Authors: TSUCHIYA Masatoshi <tsuchiya@namazu.org>,
;; Shun-ichi GOTO <gotoh@taiyo.co.jp>,
;; Satoru Takabayashi <satoru-t@is.aist-nara.ac.jp>,
;; Hideyuki SHIRAI <shirai@meadowy.org>,
;; Keisuke Nishida <kxn30@po.cwru.edu>,
;; Yuuichi Teranishi <teranisi@gohome.org>,
;; Akihiro Arisawa <ari@mbf.sphere.ne.jp>,
;; Katsumi Yamaoka <yamaoka@jpl.org>
;; Keywords: w3m, WWW, hypermedia
;; This file is a part of emacs-w3m.
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, 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 General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program; see the file COPYING. If not, write to
;; the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Commentary:
;; This module is a part of emacs-w3m which provides utility macros
;; and inline functions. Visit <URL:http://emacs-w3m.namazu.org/> for
;; more details of emacs-w3m.
;;; Code:
(eval-when-compile
(require 'cl))
;; Variables and functions which are used in the following inline
;; functions. They should be defined in the other module at run-time.
(eval-when-compile
(defvar w3m-current-process)
(defvar w3m-current-refresh)
(defvar w3m-current-title)
(defvar w3m-current-url)
(defvar w3m-fb-list-buffers-frame)
(defvar w3m-fb-mode)
(defvar w3m-mode-hook)
(defvar w3m-pop-up-frames)
(defvar w3m-pop-up-windows)
(defvar w3m-popup-frame-parameters)
(defvar w3m-previous-session-buffer)
(defvar w3m-refresh-timer)
(defvar w3m-select-buffer-name)
(defvar w3m-use-refresh)
(defvar w3m-use-tab)
(defvar w3m-work-buffer-list)
(defvar w3m-use-japanese-menu)
(defvar w3m-mode-map)
(defvar w3m-use-title-buffer-name)
(defvar w3m-buffer-unseen)
(defvar w3m-puny-utf-16be)
(unless (fboundp 'select-frame-set-input-focus)
(defalias 'select-frame-set-input-focus 'ignore)))
(eval-and-compile
(when (featurep 'xemacs)
(require 'poe)
(require 'poem)))
;;; Things should be defined in advance:
(eval-when-compile
(autoload 'w3m-detect-coding-region
(if (featurep 'emacs) "w3m-ems" "w3m-xmas"))
(autoload 'w3m-fb-frame-parameter "w3m-fb")
(autoload 'w3m-history-restore-position "w3m-hist" nil t)
(autoload 'w3m-mode "w3m"))
;; XEmacs 21.4 wants this.
(defalias 'w3m-make-local-hook (if (featurep 'xemacs)
'make-local-hook
'ignore))
;;; Control structures:
(defmacro w3m-static-if (cond then &rest else)
"Like `if', except that it evaluates COND at compile-time."
(if (eval cond) then `(progn ,@else)))
(put 'w3m-static-if 'lisp-indent-function 2)
(def-edebug-spec w3m-static-if (&rest def-form))
(put 'w3m-static-when 'lisp-indent-function 1)
(defmacro w3m-static-when (cond &rest body)
"Like `when', but evaluate COND at compile time."
(if (eval cond)
`(progn ,@body)))
(def-edebug-spec w3m-static-when (&rest def-form))
(put 'w3m-static-unless 'lisp-indent-function 1)
(defmacro w3m-static-unless (cond &rest body)
"Like `unless', but evaluate COND at compile time."
(if (eval cond)
nil
`(progn ,@body)))
(def-edebug-spec w3m-static-unless (&rest def-form))
(defmacro w3m-static-cond (&rest clauses)
"Like `cond', except that it evaluates CONDITION part of each clause at
compile-time."
(while (and clauses
(not (eval (car (car clauses)))))
(setq clauses (cdr clauses)))
(if clauses
(cons 'progn (cdr (car clauses)))))
(def-edebug-spec w3m-static-cond (&rest (&rest def-form)))
(put 'w3m-condition-case 'lisp-indent-function 2)
(defmacro w3m-condition-case (var bodyform &rest handlers)
"Like `condition-case', except that signal an error if `debug-on-error'
or `debug-on-quit' is non-nil."
`(if (or debug-on-error debug-on-quit)
,bodyform
(condition-case ,var
,bodyform
,@handlers)))
;;; Functions used in common:
;; Moved from w3m-(ems,xmas).el because of modules' dependency problem.
(defvar w3m-coding-system)
(defvar w3m-default-coding-system)
(defun w3m-decode-coding-string-with-priority (str coding)
"Decode the string STR which is encoded in CODING.
If CODING is a list, look for the coding system using it as a priority
list."
(w3m-static-if (featurep 'mule)
(with-temp-buffer
(w3m-static-when (featurep 'emacs) (set-buffer-multibyte nil))
(insert str)
(decode-coding-string
(buffer-string)
(or (if (listp coding)
(w3m-detect-coding-region (point-min) (point-max) coding)
coding)
w3m-default-coding-system
w3m-coding-system
'iso-2022-7bit)))
str))
;;; Text props:
(defmacro w3m-add-text-properties (start end props &optional object)
"Like `add-text-properties' but always add non-sticky properties."
(let ((non-stickies
(if (featurep 'xemacs)
;; Default to start-closed and end-open in XEmacsen.
'(list 'start-open t)
;; Default to front-nonsticky and rear-sticky in Emacsen.
'(list 'rear-nonsticky t))))
`(add-text-properties ,start ,end
(append ,non-stickies ,props)
,object)))
(defun w3m-add-face-property (start end name &optional object)
"Add face NAME to the face text property of the text from START to END.
The value of the existing text property should be a list.
If the optional fourth argument OBJECT is a buffer (or nil, which means
the current buffer), START and END are buffer positions (integers or
markers). If OBJECT is a string, START and END are 0-based indices
into it."
(let ((pos start)
next prop)
(while (< pos end)
(setq prop (get-text-property pos 'face object)
next (next-single-property-change pos 'face object end))
(w3m-add-text-properties pos next (list 'face (cons name prop)) object)
(setq pos next))))
(defun w3m-remove-face-property (start end name &optional object)
"Remove face NAME from the face text property of text from START to END.
The value of the existing text property should be a list.
If the optional fourth argument OBJECT is a buffer (or nil, which means
the current buffer), START and END are buffer positions (integers or
markers). If OBJECT is a string, START and END are 0-based indices
into it."
(let ((pos start)
next prop new-prop elem)
(while (< pos end)
(setq prop (get-text-property pos 'face object))
(setq next (next-single-property-change pos 'face object end))
(setq new-prop nil)
(while prop
(setq elem (pop prop))
(unless (eq elem name)
(push elem new-prop)))
(when new-prop
(w3m-add-text-properties pos next
(list 'face new-prop)))
(setq pos next))))
(defmacro w3m-get-text-property-around (prop)
"Search for the text property PROP in one character before and behind
the current position. Return the value corresponding to PROP or nil.
If PROP is not found at the current position, point will move to the
position where PROP exists."
`(let ((position (point))
value)
(or (get-text-property position ,prop)
(and (not (bolp))
(setq value (get-text-property (1- position) ,prop))
(goto-char (1- position))
value)
(and (not (eolp))
(setq value (get-text-property (1+ position) ,prop))
(goto-char (1+ position))
value))))
(defmacro w3m-action (&optional position)
"Return the value of the `w3m-action' property at the given POSITION.
NOTE: If POSITION is omitted, it searches for the property in one
character before and behind the current position, and point will move
to the position where the property exists."
(if position
`(get-text-property ,position 'w3m-action)
`(w3m-get-text-property-around 'w3m-action)))
(defmacro w3m-anchor (&optional position)
"Return the value of the `w3m-href-anchor' property at the given POSITION.
NOTE: If POSITION is omitted, it searches for the property in one
character before and behind the current position, and point will move
to the position where the property exists."
(if position
`(get-text-property ,position 'w3m-href-anchor)
`(w3m-get-text-property-around 'w3m-href-anchor)))
(defmacro w3m-image (&optional position)
"Return the value of the `w3m-image' property at the given POSITION.
NOTE: If POSITION is omitted, it searches for the property in one
character before and behind the current position, and point will move
to the position where the property exists."
(if position
`(get-text-property ,position 'w3m-image)
`(w3m-get-text-property-around 'w3m-image)))
(defmacro w3m-image-alt (&optional position)
"Return the value of the `w3m-image-alt' property at the given POSITION.
NOTE: If POSITION is omitted, it searches for the property in one
character before and behind the current position, and point will move
to the position where the property exists."
(if position
`(get-text-property ,position 'w3m-image-alt)
`(w3m-get-text-property-around 'w3m-image-alt)))
(defmacro w3m-anchor-title (&optional position)
"Return the value of the `w3m-anchor-title' property at the given POSITION.
NOTE: If POSITION is omitted, it searches for the property in one
character before and behind the current position, and point will move
to the position where the property exists."
(if position
`(get-text-property ,position 'w3m-anchor-title)
`(w3m-get-text-property-around 'w3m-anchor-title)))
(defmacro w3m-submit (&optional position)
"Return the value of the `w3m-submit' property at the given POSITION.
NOTE: If POSITION is omitted, it searches for the property in one
character before and behind the current position, and point will move
to the position where the property exists."
(if position
`(get-text-property ,position 'w3m-submit)
`(w3m-get-text-property-around 'w3m-submit)))
(defmacro w3m-anchor-sequence (&optional position)
"Return the value of the `w3m-anchor-sequence' property at POSITION.
If POSITION is omitted, the current position is assumed."
(if position
`(get-text-property ,position 'w3m-anchor-sequence)
'(get-text-property (point) 'w3m-anchor-sequence)))
;;; Attributes:
(eval-and-compile
;; `eval-and-compile' is necessary since the value of the constant
;; is referred to at the compile time.
(defconst w3m-html-string-regexp
"\\(\"\\([^\"]+\\)\"\\|'\\([^']+\\)'\\|[^\"'<> \t\r\f\n]*\\)"
"Regexp matching a string of the field-value like <a href=\"VALUE\">."))
(put 'w3m-parse-attributes 'lisp-indent-function '1)
(def-edebug-spec w3m-parse-attributes
((&rest &or (symbolp &optional symbolp) symbolp) body))
(defmacro w3m-parse-attributes (attributes &rest forms)
"Extract ATTRIBUTES, KEYWORD=\"VALUE\" pairs, in a tag and run FORMS.
ATTRIBUTES is a list of symbols that looks like `(KEYWORD KEYWORD...)'.
A symbol KEYWORD, that will express a value extracted from a tag, can
be used as a Lisp variable within FORMS. The point has to be within
a tag initially, and only attributes that follow the point will be
extracted.
The value of KEYWORD is a string by default, or is nil if the KEYWORD
is not found in a tag. KEYWORD can be `(KEYWORD TYPE)', where TYPE is
one of `:case-ignore', `:integer', `:bool', and `:decode-entity'.
Those types mean converting the value into a lower-case string,
an integer, a boolean (t or nil), and a decoded string respectively."
`(let (,@(mapcar (lambda (attr)
(if (listp attr)
(car attr)
attr))
attributes))
(skip-chars-forward " \t\r\f\n")
(while
(cond
,@(mapcar
(lambda (attr)
(or (symbolp attr)
(and (listp attr)
(<= (length attr) 2)
(symbolp (car attr)))
(error "Internal error, type mismatch"))
(let ((sexp (quote
(w3m-remove-redundant-spaces
(or (match-string-no-properties 2)
(match-string-no-properties 3)
(match-string-no-properties 1)))))
type)
(when (listp attr)
(setq type (nth 1 attr))
(cond
((eq type :case-ignore)
(setq sexp (list 'downcase sexp)))
((eq type :integer)
(setq sexp (list 'string-to-number sexp)))
((eq type :bool)
(setq sexp t))
((eq type :decode-entity)
(setq sexp (list 'w3m-decode-entities-string sexp)))
((nth 1 attr)
(error "Internal error, unknown modifier")))
(setq attr (car attr)))
`((looking-at
,(if (eq type :bool)
(format "%s\\(?:[ \t\r\f\n]*=[ \t\r\f\n]*%s\\)?"
(symbol-name attr)
w3m-html-string-regexp)
(format "%s[ \t\r\f\n]*=[ \t\r\f\n]*%s"
(symbol-name attr)
w3m-html-string-regexp)))
(setq ,attr ,sexp))))
attributes)
((looking-at ,(concat "[A-Za-z]*[ \t\r\f\n]*=[ \t\r\f\n]*"
w3m-html-string-regexp)))
((looking-at "[^<> \t\r\f\n]+")))
(goto-char (match-end 0))
(skip-chars-forward " \t\r\f\n"))
(skip-chars-forward "^>")
(forward-char)
,@forms))
;;; Working buffers:
(defun w3m-get-buffer-create (name)
"Return the buffer named NAME, or create such a buffer and return it."
(or (get-buffer name)
(let ((buf (get-buffer-create name)))
(setq w3m-work-buffer-list (cons buf w3m-work-buffer-list))
(buffer-disable-undo buf)
buf)))
(defun w3m-kill-buffer (buffer)
"Kill the buffer BUFFER and remove it from `w3m-work-buffer-list'.
The argument may be a buffer or may be the name of a buffer.
An argument of nil means kill the current buffer."
(unless buffer
(setq buffer (current-buffer)))
(when (stringp buffer)
(setq buffer (get-buffer buffer)))
(when (buffer-live-p buffer)
(kill-buffer buffer))
(setq w3m-work-buffer-list (delq buffer w3m-work-buffer-list))
nil)
(defun w3m-kill-all-buffer ()
"Kill all working buffer."
(dolist (buf w3m-work-buffer-list)
(when (buffer-live-p buf)
(kill-buffer buf)))
(setq w3m-work-buffer-list nil))
(defun w3m-current-title ()
"Return the title of the current buffer."
(cond
(w3m-current-process
"<retrieving>")
((and (stringp w3m-current-title)
(not (string= w3m-current-title "<no-title>")))
w3m-current-title)
((stringp w3m-current-url)
(directory-file-name
(if (string-match "^[^/:]+:/+" w3m-current-url)
(substring w3m-current-url (match-end 0))
w3m-current-url)))
(t "<no-title>")))
(defun w3m-buffer-title (buffer)
"Return the title of the buffer BUFFER."
(with-current-buffer buffer
(w3m-current-title)))
(defun w3m-buffer-number (buffer)
(when (and (bufferp buffer)
(string-match "\\*w3m\\*\\(<\\([0-9]+\\)>\\)?\\'"
(buffer-name buffer)))
(if (match-beginning 1)
(string-to-number (match-string 2 (buffer-name buffer)))
1))) ;; `1' should not be represented in the buffer name.
(defun w3m-buffer-set-number (buffer number)
(with-current-buffer buffer
(let ((newname (if w3m-use-title-buffer-name
(if (= number 1)
(format "%s *w3m*" (w3m-current-title))
(format "%s *w3m*<%d>" (w3m-current-title) number))
(if (= number 1)
"*w3m*"
(format "*w3m*<%d>" number)))))
(if (eq (w3m-buffer-number buffer) number)
(when w3m-use-title-buffer-name
(unless (get-buffer newname)
(rename-buffer newname)))
(unless (get-buffer newname)
(rename-buffer newname))))))
(defun w3m-buffer-name-add-title ()
"Add current tile to buffer name."
(when w3m-use-title-buffer-name
(let ((number (w3m-buffer-number (current-buffer)))
newname)
(if (= number 1)
(setq newname (format "%s *w3m*" (w3m-current-title)))
(setq newname (format "%s *w3m*<%d>" (w3m-current-title) number)))
(rename-buffer newname))))
(defun w3m-generate-new-buffer (name &optional next)
"Create and return a buffer with a name based on NAME.
Make the new buffer the next of the current buffer if NEXT is non-nil."
(when w3m-use-title-buffer-name
(let* ((tailbufs (let ((w3m-fb-mode nil))
(let ((all-w3m-buffers (w3m-list-buffers)))
(if next
(memq (current-buffer) all-w3m-buffers)
(last all-w3m-buffers)))))
(new-buffer-number (w3m-buffer-number (car tailbufs))))
(when (string-match "\\*w3m\\*\\(<\\([0-9]+\\)>\\)?\\'" name)
(setq name "*w3m*"))
(when (and tailbufs new-buffer-number)
(let ((n (1+ new-buffer-number)))
(dolist (buf (cdr tailbufs))
(w3m-buffer-set-number buf (setq n (1+ n))))
(setq name (format "%s<%d>" name (1+ new-buffer-number)))))))
(let ((prev (and (eq major-mode 'w3m-mode) (current-buffer)))
(new (generate-new-buffer name)))
(with-current-buffer new
(w3m-mode)
(setq w3m-previous-session-buffer prev))
new))
(defun w3m-buffer-name-lessp (x y)
"Return t if first arg buffer's name is less than second."
(when (bufferp x)
(setq x (buffer-name x)))
(when (bufferp y)
(setq y (buffer-name y)))
(if (and (string-match "\\*w3m\\*\\(<\\([0-9]+\\)>\\)?\\'" x)
(setq x (cons x
(if (match-beginning 1)
(string-to-number (match-string 2 x))
0))))
(if (string-match "\\*w3m\\*\\(<\\([0-9]+\\)>\\)?\\'" y)
(< (cdr x)
(if (match-beginning 1)
(string-to-number (match-string 2 y))
0))
(string< (car x) y))
(string< x y)))
(defun w3m-list-buffers (&optional nosort)
"Return a list of buffers in which emacs-w3m sessions are open.
If the optional NOSORT is nil, the list is sorted in the order of
buffer names."
(let ((buffers (buffer-list))
buffer rest)
(save-current-buffer
(while buffers
(set-buffer (setq buffer (pop buffers)))
(when (eq major-mode 'w3m-mode)
(push buffer rest))))
(setq buffers (if nosort
(nreverse rest)
(sort rest #'w3m-buffer-name-lessp)))
(when (and (boundp 'w3m-fb-mode)
w3m-fb-mode
(if (or w3m-pop-up-frames
(not (memq 'w3m-fb-add w3m-mode-hook)))
;; `w3m-fb-mode' might have been set by something
;; other than the `w3m-fb-mode' function.
(setq w3m-fb-mode nil)
t))
;; Don't just return `w3m-fb-buffer-list' for the selected frame
;; because `buffers' may have been sorted.
(let ((fbs (w3m-fb-frame-parameter w3m-fb-list-buffers-frame
'w3m-fb-buffer-list)))
(setq rest buffers)
(while rest
(unless (memq (setq buffer (pop rest)) fbs)
(setq buffers (delq buffer buffers))))))
buffers))
;;; Pop up and delete buffers, windows or frames:
(defmacro w3m-popup-frame-parameters ()
"Return a pop-up frame plist if this file is compiled for XEmacs,
otherwise return an alist."
(if (featurep 'xemacs)
'(let ((params (or w3m-popup-frame-parameters pop-up-frame-plist)))
(if (consp (car-safe params))
(alist-to-plist params)
params))
'(let ((params (or w3m-popup-frame-parameters pop-up-frame-alist))
alist)
(if (consp (car-safe params))
params
(while params
(push (cons (car params) (cdr params)) alist)
(setq params (cddr params)))
(nreverse alist)))))
(defun w3m-device-on-window-system-p ()
"Return non-nil if the selected frame is on a window system"
(w3m-static-if (featurep 'xemacs)
(device-on-window-system-p)
window-system))
(defmacro w3m-popup-frame-p ()
"Return non-nil if `w3m-pop-up-frames' is non-nil and Emacs really
supports separate frames."
'(and w3m-pop-up-frames (w3m-device-on-window-system-p)))
(defmacro w3m-use-tab-p ()
"Return non-nil if `w3m-use-tab' is non-nil and Emacs really supports
the tabs line."
(cond ((featurep 'xemacs)
'(and w3m-use-tab (device-on-window-system-p)))
(t
'w3m-use-tab)))
(defun w3m-lefttab-exist-p (&optional buffer)
(not (eq (or buffer (current-buffer)) (car (w3m-list-buffers)))))
(defun w3m-righttab-exist-p (&optional buffer)
(let ((bufs (w3m-list-buffers))
(cbuf (or buffer (current-buffer)))
buf)
(catch 'exist
(while (setq buf (car bufs))
(setq bufs (cdr bufs))
(when (eq cbuf buf)
(throw 'exist bufs))))))
(defmacro w3m-popup-window-p ()
"Return non-nil if `w3m-pop-up-windows' is non-nil and the present
situation allows it."
'(and w3m-pop-up-windows
(not (w3m-use-tab-p))
(not (get-buffer-window w3m-select-buffer-name))))
(defvar w3m-initial-frames nil
"Variable used to keep a list of the frame-IDs when emacs-w3m sessions
are popped-up as new frames. This variable is used for the control
for not deleting frames made for aims other than emacs-w3m sessions.")
(make-variable-buffer-local 'w3m-initial-frames)
(defun w3m-popup-buffer (buffer)
"Pop up BUFFER as a new window or a new frame, per the `w3m-display-mode'."
(let ((window (get-buffer-window buffer t))
oframe popup-frame-p frame pop-up-frames buffers other)
(unless (eq window (selected-window))
(setq oframe (selected-frame)
popup-frame-p (w3m-popup-frame-p))
(if (setq
pop-up-frames
(if window ;; The window showing BUFFER already exists.
;; Don't pop up a new frame if it is just the current frame.
(not (eq (setq frame (window-frame window)) oframe))
;; There is no window for BUFFER, so look for the existing
;; emacs-w3m window if the tabs line is enabled or the
;; selection window exists (i.e., we can reuse it).
(if (or (w3m-use-tab-p)
(get-buffer-window w3m-select-buffer-name t))
(progn
(setq buffers (delq buffer (w3m-list-buffers t)))
(while (and (not window)
buffers)
(setq window
(get-buffer-window (setq other (pop buffers)) t)))
(if window ;; The window showing another buffer exists.
(not (eq (setq frame (window-frame window)) oframe))
(setq other nil)
;; There is no window after all, so leave to the value
;; of `w3m-pop-up-frames' whether to pop up a new frame.
popup-frame-p))
;; Ditto.
popup-frame-p)))
(progn
(cond (other
;; Pop up another emacs-w3m buffer and switch to BUFFER.
(pop-to-buffer other)
;; Change the value for BUFFER's `w3m-initial-frames'.
(setq w3m-initial-frames
(prog1
(copy-sequence w3m-initial-frames)
(switch-to-buffer buffer))))
(frame
;; Pop up the existing frame which shows BUFFER.
(pop-to-buffer buffer))
(t
;; Pop up a new frame.
(let* ((pop-up-frame-alist (w3m-popup-frame-parameters))
(pop-up-frame-plist pop-up-frame-alist))
(pop-to-buffer buffer))
(setq frame (window-frame (get-buffer-window buffer t)))))
;; Raise, select and focus the frame.
(if (fboundp 'select-frame-set-input-focus)
(select-frame-set-input-focus frame)
(raise-frame frame)
(select-frame frame)
(w3m-static-when (featurep 'xemacs)
(focus-frame frame))))
;; Simply switch to BUFFER in the current frame.
(let ((cd default-directory))
(if (w3m-popup-window-p)
(let ((pop-up-windows t))
(pop-to-buffer buffer))
(switch-to-buffer buffer))
(setq default-directory cd))
(w3m-history-restore-position)))))
(eval-when-compile
(when (and (fboundp 'select-frame-set-input-focus)
(eq (symbol-function 'select-frame-set-input-focus) 'ignore))
(fmakunbound 'select-frame-set-input-focus)))
(defun w3m-add-w3m-initial-frames (&optional frame)
"Add FRAME into `w3m-initial-frames', the buffer-local variable.
It is done when FRAME is newly created for the emacs-w3m session.
This function is added to the hook which is different with the Emacs
version as follows:
XEmacs `create-frame-hook'
Emacs 21,22 `after-make-frame-functions'
Emacs 19 `after-make-frame-hook'
Note that `after-make-frame-hook' doesn't take an argument."
(unless frame
(setq frame (selected-frame)))
;; Share the opened frame in `w3m-initial-frames' over all emacs-w3m
;; buffers if using a tabbed display mode. Otherwise, the frame is
;; appended into `w3m-initial-frames' only in the current buffer.
(with-current-buffer (window-buffer (frame-first-window frame))
(when (eq major-mode 'w3m-mode)
(unless (memq frame w3m-initial-frames)
(push frame w3m-initial-frames))
(when w3m-use-tab
(dolist (buffer (delq (current-buffer) (w3m-list-buffers t)))
(set-buffer buffer)
(unless (memq frame w3m-initial-frames)
(push frame w3m-initial-frames)))))))
(add-hook (if (featurep 'xemacs)
'create-frame-hook
'after-make-frame-functions)
'w3m-add-w3m-initial-frames)
(defun w3m-delete-w3m-initial-frames (frame)
"Delete FRAME from `w3m-initial-frames', the buffer-local variable.
It is done when the FRAME in which emacs-w3m is running is deleted.
This function is added to `delete-frame-functions' or merged into
the `delete-frame' function using `defadvice'."
(save-current-buffer
(dolist (buffer (w3m-list-buffers t))
(set-buffer buffer)
(setq w3m-initial-frames (delq frame w3m-initial-frames)))))
(add-hook 'delete-frame-functions 'w3m-delete-w3m-initial-frames)
(defun w3m-delete-frames-and-windows (&optional exception)
"Delete all frames and windows related to emacs-w3m buffers.
If EXCEPTION is a buffer, a window or a frame, it and related visible
objects will not be deleted. There are special cases; the following
objects will not be deleted:
1. The sole frame in the display device.
2. Frames created not for emacs-w3m sessions.
3. Frames showing not only emacs-w3m sessions but also other windows.\
"
(let ((buffers (delq exception (w3m-list-buffers t)))
buffer windows window frame one-window-p flag)
(save-current-buffer
(while buffers
(setq buffer (pop buffers)
windows (delq exception
(get-buffer-window-list buffer 'no-minibuf t)))
(set-buffer buffer)
(while windows
(setq window (pop windows)
frame (and (window-live-p window) (window-frame window)))
(when (and frame
(not (eq frame exception)))
(setq flag nil)
(setq one-window-p
;; This is similar to the `one-window-p' function
;; but works for even unselected windows in addition
;; to the selected window in all frames.
(catch 'two
(walk-windows (lambda (w)
(when (eq (window-frame w) frame)
(if flag
(throw 'two nil)
(setq flag t))))
'no-minibuf t)
flag))
(when (and
(or
;; A frame having only windows for emacs-w3m
;; sessions or the buffer selection can be deleted.
(progn
(setq flag t)
(walk-windows
(lambda (w)
(when flag
(if (eq w exception)
(setq flag nil)
(set-buffer (window-buffer w))
(when (setq flag
(or
(memq major-mode
'(w3m-mode
w3m-select-buffer-mode
w3m-session-select-mode))
(string-match "\\` ?\\*w3m[ -]"
(buffer-name))))
(if (eq (next-window w 'no-minibuf) w)
(bury-buffer)
(delete-window w))))))
'no-minibuf)
(set-buffer buffer)
flag)
;; Also a frame having the sole window can be deleted.
one-window-p)
(memq frame w3m-initial-frames)
(not (eq (next-frame frame) frame)))
(let ((delete-frame-functions
(delq 'w3m-fb-delete-frame-buffers
(copy-sequence delete-frame-functions))))
(delete-frame frame)))))))))
;;; Navigation:
(defmacro w3m-goto-next-defun (name property)
"Create function w3m-goto-next- NAME.
Return position of the first occurence of PROPERTY.
If currently over such PROPERTY, find next such occurence."
`(defun ,(intern (concat "w3m-goto-next-" (symbol-name name)))
(&optional pos)
,(concat "Return position of next " (symbol-name name)
" starting from POS or point.")
(setq pos (or pos (point)))
(if (get-char-property pos ',property) ; currently over such element
(setq pos (next-single-property-change pos ',property)))
(if (or (get-char-property pos ',property)
(setq pos (next-single-property-change pos ',property)))
pos)))
(w3m-goto-next-defun link w3m-href-anchor)
(w3m-goto-next-defun image2 w3m-image)
(defun w3m-goto-next-anchor-or-image (&optional pos)
"Return position of next anchor or image starting from POS or point."
(setq pos (or pos (point)))
(cond ; currently on anchor or image
((w3m-anchor-sequence pos)
(setq pos (next-single-property-change pos 'w3m-anchor-sequence)))
((w3m-image pos)
(setq pos (next-single-property-change pos 'w3m-image))))
(or (w3m-anchor-sequence pos)
(w3m-image pos)
(let ((image-pos (next-single-property-change pos 'w3m-image)))
(setq pos (next-single-property-change pos
'w3m-anchor-sequence))
(and image-pos
(or (not pos) (> pos image-pos))
(setq pos image-pos))))
(if pos
(let ((hseq (w3m-anchor-sequence pos)))
(if (and hseq (text-property-any ; multiline anchors
(point-min) pos 'w3m-anchor-sequence hseq))
(w3m-goto-next-anchor-or-image pos)
pos))))
;;; Miscellaneous:
(eval-and-compile
(defconst w3m-url-invalid-base "http:///"
"A url base used to make url absolutely invalid.
`w3m-expand-url' will use it as a last resort if no other appropriate
base is given."))
(defsubst w3m-url-valid (url)
"Return URL if it is not marked invalid, otherwise nil.
This function is intended only to reject a url that `w3m-expand-url'
marks invalid purposely (using `w3m-url-invalid-base'), does not
necessarily guarantee that URL to return is valid in a general sense."
;; cf. [emacs-w3m:04095], [emacs-w3m:04101] (Japanese),
;; and [emacs-w3m:12761] (summarized in English).
(and url
(not (string-match (eval-when-compile
(concat "\\`" w3m-url-invalid-base))
url))
url))
(defmacro w3m-substitute-key-definitions (new-map old-map &rest keys)
"In NEW-MAP substitute cascade of OLD-MAP KEYS.
KEYS is alternating list of key-value."
(let ((n-map new-map)
(o-map old-map))
`(progn
,@(let ((res nil))
(while keys
(push `(substitute-key-definition
,(car keys) ,(cadr keys) ,n-map ,o-map)
res)
(setq keys (cddr keys)))
(nreverse res)))))
(defmacro w3m-set-match-data (list)
"Same as the `set-match-data'; convert points into markers under XEmacs."
(if (featurep 'xemacs)
`(let ((list ,list))
(store-match-data (dolist (pt (prog1 list (setq list nil))
(nreverse list))
(push (if (markerp pt)
pt
(set-marker (make-marker) pt))
list))))
`(set-match-data ,list)))
(defun w3m-search-tag-1 (regexp)
"Subroutine used by `w3m-search-tag'."
(let ((start (point))
begin end)
(if (and (re-search-forward regexp nil t)
(setq begin (match-beginning 0)
end (match-end 0))
(or (looking-at "/?>")
(and (looking-at "[ \t\f\n]")
(search-forward ">" nil t))))
(prog1
(goto-char (match-end 0))
(w3m-set-match-data
(cond ((= end (match-beginning 0))
(list begin (match-end 0)
(1+ begin) end))
((eq (char-before (match-beginning 0)) ?/)
(if (= end (1- (match-beginning 0)))
(list begin (match-end 0)
(1+ begin) end)
(list begin (match-end 0)
(1+ begin) end
end (- (match-end 0) 2))))
(t
(list begin (match-end 0)
(1+ begin) end
end (1- (match-end 0)))))))
(set-match-data nil)
(goto-char start)
nil)))
(defmacro w3m-search-tag (&rest names)
"Search forward for a tag which begins with one of NAMES.
This macro generates the form equivalent to:
\(re-search-forward \"<\\\\(NAMES\\\\)\\\\([ \\t\\f\\n]+[^>]*\\\\)?/?>\" nil t)
but it works even if the tag is considerably large.
Note: this macro allows only strings for NAMES, that is, a form
something like `(if foo \"bar\" \"baz\")' cannot be used."
`(w3m-search-tag-1 ,(concat "<" (regexp-opt names t))))
(defun w3m-beginning-of-tag (&optional tag include-whitespace)
"Move point to the beginning of tag. Inner nested tags are skipped.
If TAG, which is a name of the tag, is given, this function moves point
backward from the closing-tag </TAG> (point has to exist after or within
it initially) to the beginning point of the open-tag <TAG ...>. For
example, in the following two situations, point moves backward from the
rightmost tag to the beginning point of the leftmost tag:
<TAG ...>...<TAG ...>...<TAG ...>...</TAG>...</TAG>...</TAG>
<TAG ...>...<TAG ...>...</TAG>...<TAG ...>...</TAG>...</TAG>
If TAG is omitted or nil, this function moves point backward to the
beginning point of the tag in which point exists. In this case, point
has to initially exist between the end position of the closing-tag and
the previous tag as follows:
<!-- foo <bar ...<baz ...>...> -->
^^^
If INCLUDE-WHITESPACE is non-nil, include leading and trailing
whitespace. Return the end-point and set the match-data #0, #1, #2,
and #3 as follows (\"___\" shows whitespace):
The case where TAG is spefified:
___<TAG ...>___...___</TAG>___
0 1 2 2 1 0 INCLUDE-WHITESPACE=nil
0 1 2 3 3 2 1 0 INCLUDE-WHITESPACE=non-nil
The case where TAG is nil:
___<TAG ...>___
0 0 INCLUDE-WHITESPACE=nil
0 1 1 0 INCLUDE-WHITESPACE=non-nil"
(let ((init (point))
(num 1)
(md (match-data))
(case-fold-search t)
end regexp nd1 nd2 nd3 st1 st2 st3 st0 nd0)
(condition-case nil
(progn
(if tag
(progn
(setq end (point)
tag (regexp-quote tag))
(if (and (re-search-backward (concat "\
\\(<[\t\n\r ]*/[\t\n\r ]*" tag "\
\\(?:[\t\n\r ]*\\|[\t\n\r ]+[^>]+\\)>\\)[\t\n\r ]*") nil t)
(eq end (match-end 0)))
(progn
(setq nd1 (nth 3 (match-data)) ;; (match-end 1)
nd2 (nth 2 (match-data))) ;; (match-beginning 1)
(skip-chars-backward "\t\n\r ")
(setq nd3 (point-marker))
(goto-char end))
(goto-char end)
(search-forward ">")
(setq end (point))
(if (and (re-search-backward (concat "\
<[\t\n\r ]*/[\t\n\r ]*" tag "\\(?:[\t\n\r ]*\\|[\t\n\r ]+[^>]+\\)>"))
(eq end (match-end 0)))
(progn
(setq nd1 (nth 1 (match-data)) ;; (match-end 0)
nd2 (car (match-data))) ;; (match-beginning 0)
(skip-chars-backward "\t\n\r ")
(setq nd3 (point-marker)))
(error "")))
(goto-char (1- nd2))
(setq regexp (concat "\\(<\\([\t\n\r ]*/\\)?[\t\n\r ]*" tag "\
\\(?:[\t\n\r ]*\\|[\t\n\r ]+[^>]+\\)>\\)[\t\n\r ]*"))
(while (and (> num 0)
(re-search-backward regexp))
(setq num (if (match-beginning 2)
(1+ num)
(1- num))))
(setq st1 (car (match-data)) ;; (match-beginning 0)
st2 (nth 3 (match-data)) ;; (match-end 1)
;; There may be only whitespace between <tag>...</tag>.
st3 (min nd3 (nth 1 (match-data))))) ;; (match-end 0)
(search-forward ">")
(setq nd1 (nth 1 (match-data))) ;; (match-end 0)
(goto-char init)
(while (and (> num 0)
(re-search-backward "\\(<\\)\\|>"))
(setq num (if (match-beginning 1)
(1- num)
(1+ num))))
(setq st1 (nth 2 (match-data)))) ;; (match-beginning 1)
(if include-whitespace
(progn
(skip-chars-backward "\t\n\r ")
(setq st0 (point-marker))
(goto-char nd1)
(skip-chars-forward "\t\n\r ")
(setq nd0 (point-marker))
(goto-char st0)
(set-match-data (if tag
(list st0 nd0 st1 nd1 st2 nd2 st3 nd3)