xemacs-beta: src/select.c comparison

comparison src/select.c @ 414:da8ed4261e83 r21-2-15

Import from CVS: tag r21-2-15

author	cvs
date	Mon, 13 Aug 2007 11:21:38 +0200
parents
children	8de8e3f6228a

comparison

equal deleted inserted replaced

-:901169e5ca31
+:da8ed4261e83
+/* Generic selection processing for XEmacs
+Copyright (C) 1999 Free Software Foundation, Inc.
+Copyright (C) 1999 Andy Piper.
+This file is part of XEmacs.
+XEmacs 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.
+XEmacs 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 XEmacs; see the file COPYING.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+/* Synched up with: Not synched with FSF. */
+#include <config.h>
+#include "lisp.h"
+#include "buffer.h"
+#include "device.h"
+#include "console.h"
+#include "objects.h"
+#include "frame.h"
+#include "opaque.h"
+#include "select.h"
+Lisp_Object QPRIMARY, QSECONDARY, QSTRING, QINTEGER, QCLIPBOARD, QTIMESTAMP,
+QTEXT, QDELETE, QMULTIPLE, QINCR, QEMACS_TMP, QTARGETS, QATOM, QNULL,
+QATOM_PAIR, QCOMPOUND_TEXT;
+/* "Selection owner couldn't convert selection" */
+Lisp_Object Qselection_conversion_error;
+/* This is an alist whose CARs are selection-types (whose names are the same
+as the names of X Atoms) and whose CDRs are the names of Lisp functions to
+call to convert the given Emacs selection value to a string representing
+the given selection type.  This is for elisp-level extension of the emacs
+selection handling.
+*/
+Lisp_Object Vselection_converter_alist;
+Lisp_Object Vlost_selection_hooks;
+/* This is an association list whose elements are of the form
+( selection-name selection-value selection-timestamp )
+selection-name is a lisp symbol, whose name is the name of an X Atom.
+selection-value is the value that emacs owns for that selection.
+It may be any kind of Lisp object.
+selection-timestamp is the time at which emacs began owning this selection,
+as a cons of two 16-bit numbers (making a 32 bit time).
+If there is an entry in this alist, then it can be assumed that emacs owns
+that selection.
+The only (eq) parts of this list that are visible from elisp are the
+selection-values.
+*/
+Lisp_Object Vselection_alist;
+static Lisp_Object
+clean_local_selection_data (Lisp_Object obj)
+{
+if (CONSP (obj) &&
+INTP (XCAR (obj)) &&
+CONSP (XCDR (obj)) &&
+INTP (XCAR (XCDR (obj))) &&
+NILP (XCDR (XCDR (obj))))
+obj = Fcons (XCAR (obj), XCDR (obj));
+if (CONSP (obj) &&
+INTP (XCAR (obj)) &&
+INTP (XCDR (obj)))
+{
+if (XINT (XCAR (obj)) == 0)
+	return XCDR (obj);
+if (XINT (XCAR (obj)) == -1)
+	return make_int (- XINT (XCDR (obj)));
+}
+if (VECTORP (obj))
+{
+int i;
+int len = XVECTOR_LENGTH (obj);
+Lisp_Object copy;
+if (len == 1)
+	return clean_local_selection_data (XVECTOR_DATA (obj) [0]);
+copy = make_vector (len, Qnil);
+for (i = 0; i < len; i++)
+	XVECTOR_DATA (copy) [i] =
+	  clean_local_selection_data (XVECTOR_DATA (obj) [i]);
+return copy;
+}
+return obj;
+}
+/* Given a selection-name and desired type, this looks up our local copy of
+the selection value and converts it to the type.  It returns nil or a
+string.  This calls random elisp code, and may signal or gc.
+*/
+Lisp_Object
+get_local_selection (Lisp_Object selection_symbol, Lisp_Object target_type)
+{
+/* This function can GC */
+Lisp_Object handler_fn, value, check;
+Lisp_Object local_value = assq_no_quit (selection_symbol, Vselection_alist);
+if (NILP (local_value)) return Qnil;
+/* TIMESTAMP and MULTIPLE are special cases 'cause that's easiest. */
+if (EQ (target_type, QTIMESTAMP))
+{
+handler_fn = Qnil;
+value = XCAR (XCDR (XCDR (local_value)));
+}
+#if 0 /* #### MULTIPLE doesn't work yet and probably never will */
+else if (CONSP (target_type) &&
+	   XCAR (target_type) == QMULTIPLE)
+{
+Lisp_Object pairs = XCDR (target_type);
+int len = XVECTOR_LENGTH (pairs);
+int i;
+/* If the target is MULTIPLE, then target_type looks like
+	  (MULTIPLE . [[SELECTION1 TARGET1] [SELECTION2 TARGET2] ... ])
+	 We modify the second element of each pair in the vector and
+	 return it as [[SELECTION1 <value1>] [SELECTION2 <value2>] ... ]
+*/
+for (i = 0; i < len; i++)
+	{
+	  Lisp_Object pair = XVECTOR_DATA (pairs) [i];
+	  XVECTOR_DATA (pair) [1] =
+	    x_get_local_selection (XVECTOR_DATA (pair) [0],
+				   XVECTOR_DATA (pair) [1]);
+	}
+return pairs;
+}
+#endif
+else
+{
+CHECK_SYMBOL (target_type);
+handler_fn = Fcdr (Fassq (target_type, Vselection_converter_alist));
+if (NILP (handler_fn)) return Qnil;
+value = call3 (handler_fn,
+		     selection_symbol, target_type,
+		     XCAR (XCDR (local_value)));
+}
+/* This lets the selection function to return (TYPE . VALUE).  For example,
+when the selected type is LINE_NUMBER, the returned type is SPAN, not
+INTEGER.
+*/
+check = value;
+if (CONSP (value) && SYMBOLP (XCAR (value)))
+check = XCDR (value);
+/* Strings, vectors, and symbols are converted to selection data format in
+the obvious way.  Integers are converted to 16 bit quantities if they're
+small enough, otherwise 32 bits are used.
+*/
+if (STRINGP (check) ||
+VECTORP (check) ||
+SYMBOLP (check) ||
+INTP    (check) ||
+CHARP   (check) ||
+NILP (value))
+return value;
+/* (N . M) or (N M) get turned into a 32 bit quantity.  So if you want to
+always return a small quantity as 32 bits, your converter routine needs
+to return a cons.
+*/
+else if (CONSP (check) &&
+	   INTP (XCAR (check)) &&
+	   (INTP (XCDR (check)) ||
+	    (CONSP (XCDR (check)) &&
+	     INTP (XCAR (XCDR (check))) &&
+	     NILP (XCDR (XCDR (check))))))
+return value;
+/* Otherwise the lisp converter function returned something unrecognized.
+*/
+else
+signal_error (Qerror,
+list3 (build_string
+			 ("unrecognized selection-conversion type"),
+handler_fn,
+value));
+return Qnil;	/* suppress compiler warning */
+}
+DEFUN ("own-selection-internal", Fown_selection_internal, 2, 3, 0, /*
+Assert a selection of the given TYPE with the given VALUE.
+TYPE is a symbol, typically PRIMARY, SECONDARY, or CLIPBOARD.
+VALUE is typically a string, or a cons of two markers, but may be
+anything that the functions on selection-converter-alist know about.
+*/
+(selection_name, selection_value, device))
+{
+Lisp_Object selection_time, selection_data, prev_value;
+CHECK_SYMBOL (selection_name);
+if (NILP (selection_value)) error ("selection-value may not be nil.");
+if (NILP (device))
+device = Fselected_device (Qnil);
+/* Now update the local cache */
+selection_data = list3 (selection_name,
+			  selection_value,
+			  Qnil);
+prev_value = assq_no_quit (selection_name, Vselection_alist);
+Vselection_alist = Fcons (selection_data, Vselection_alist);
+/* If we already owned the selection, remove the old selection data.
+Perhaps we should destructively modify it instead.
+Don't use Fdelq() as that may QUIT;.
+*/
+if (!NILP (prev_value))
+{
+Lisp_Object rest;	/* we know it's not the CAR, so it's easy. */
+for (rest = Vselection_alist; !NILP (rest); rest = Fcdr (rest))
+	if (EQ (prev_value, Fcar (XCDR (rest))))
+	  {
+	    XCDR (rest) = Fcdr (XCDR (rest));
+	    break;
+	  }
+}
+/* have to do device specific stuff last so that methods can access the
+selection_alist */
+if (HAS_DEVMETH_P (XDEVICE (device), own_selection))
+selection_time = DEVMETH (XDEVICE (device), own_selection,
+			      (selection_name, selection_value));
+else
+selection_time = Qnil;
+Fsetcar (XCDR (XCDR (selection_data)), selection_time);
+return selection_value;
+}
+/* remove a selection from our local copy
+*/
+void
+handle_selection_clear (Lisp_Object selection_symbol)
+{
+Lisp_Object local_selection_data = assq_no_quit (selection_symbol, Vselection_alist);
+/* Well, we already believe that we don't own it, so that's just fine. */
+if (NILP (local_selection_data)) return;
+/* Otherwise, we're really honest and truly being told to drop it.
+Don't use Fdelq() as that may QUIT;.
+*/
+if (EQ (local_selection_data, Fcar (Vselection_alist)))
+Vselection_alist = Fcdr (Vselection_alist);
+else
+{
+Lisp_Object rest;
+for (rest = Vselection_alist; !NILP (rest); rest = Fcdr (rest))
+	if (EQ (local_selection_data, Fcar (XCDR (rest))))
+	  {
+	    XCDR (rest) = Fcdr (XCDR (rest));
+	    break;
+	  }
+}
+/* Let random lisp code notice that the selection has been stolen.
+*/
+{
+Lisp_Object rest;
+Lisp_Object val = Vlost_selection_hooks;
+if (!UNBOUNDP (val) && !NILP (val))
+{
+	if (CONSP (val) && !EQ (XCAR (val), Qlambda))
+	  for (rest = val; !NILP (rest); rest = Fcdr (rest))
+	    call1 (Fcar (rest), selection_symbol);
+	else
+	  call1 (val, selection_symbol);
+}
+}
+}
+DEFUN ("disown-selection-internal", Fdisown_selection_internal, 1, 3, 0, /*
+If we own the named selection, then disown it (make there be no selection).
+*/
+(selection_name, selection_time, device))
+{
+if (NILP (assq_no_quit (selection_name, Vselection_alist)))
+return Qnil;  /* Don't disown the selection when we're not the owner. */
+if (NILP (device))
+device = Fselected_device (Qnil);
+MAYBE_DEVMETH (XDEVICE (device), disown_selection,
+		 (selection_name, selection_time));
+handle_selection_clear (selection_name);
+return Qt;
+}
+DEFUN ("selection-owner-p", Fselection_owner_p, 0, 1, 0, /*
+Return t if current emacs process owns the given Selection.
+The arg should be the name of the selection in question, typically one of
+the symbols PRIMARY, SECONDARY, or CLIPBOARD.  (For convenience, the symbol
+nil is the same as PRIMARY, and t is the same as SECONDARY.)
+*/
+(selection))
+{
+CHECK_SYMBOL (selection);
+if      (EQ (selection, Qnil)) selection = QPRIMARY;
+else if (EQ (selection, Qt))   selection = QSECONDARY;
+return NILP (Fassq (selection, Vselection_alist)) ? Qnil : Qt;
+}
+DEFUN ("selection-exists-p", Fselection_exists_p, 0, 2, 0, /*
+Whether there is an owner for the given Selection.
+The arg should be the name of the selection in question, typically one of
+the symbols PRIMARY, SECONDARY, or CLIPBOARD.  (For convenience, the symbol
+nil is the same as PRIMARY, and t is the same as SECONDARY.)
+*/
+(selection, device))
+{
+CHECK_SYMBOL (selection);
+if (!NILP (Fselection_owner_p (selection)))
+return Qt;
+if (NILP (device))
+device = Fselected_device (Qnil);
+return HAS_DEVMETH_P (XDEVICE (device), selection_exists_p) ?
+DEVMETH (XDEVICE (device), selection_exists_p, (selection))
+: Qnil;
+}
+/* Request the selection value from the owner.  If we are the owner,
+simply return our selection value.  If we are not the owner, this
+will block until all of the data has arrived.
+*/
+DEFUN ("get-selection-internal", Fget_selection_internal, 2, 3, 0, /*
+Return text selected from some window-system window.
+SELECTION_SYMBOL is a symbol, typically PRIMARY, SECONDARY, or CLIPBOARD.
+TARGET_TYPE is the type of data desired, typically STRING or COMPOUND_TEXT.
+Under Mule, if the resultant data comes back as 8-bit data in type
+TEXT or COMPOUND_TEXT, it will be decoded as Compound Text.
+*/
+(selection_symbol, target_type, device))
+{
+/* This function can GC */
+Lisp_Object val = Qnil;
+struct gcpro gcpro1, gcpro2;
+GCPRO2 (target_type, val); /* we store newly consed data into these */
+CHECK_SYMBOL (selection_symbol);
+if (NILP (device))
+device = Fselected_device (Qnil);
+#if 0 /* #### MULTIPLE doesn't work yet and probably never will */
+if (CONSP (target_type) &&
+XCAR (target_type) == QMULTIPLE)
+{
+CHECK_VECTOR (XCDR (target_type));
+/* So we don't destructively modify this... */
+target_type = copy_multiple_data (target_type);
+}
+else
+#endif
+CHECK_SYMBOL (target_type);
+val = get_local_selection (selection_symbol, target_type);
+if (NILP (val) && (HAS_DEVMETH_P (XDEVICE (device), get_foreign_selection)))
+{
+val = DEVMETH (XDEVICE (device), get_foreign_selection,
+		     (selection_symbol, target_type));
+}
+else
+{
+if (CONSP (val) && SYMBOLP (XCAR (val)))
+	{
+	  val = XCDR (val);
+	  if (CONSP (val) && NILP (XCDR (val)))
+	    val = XCAR (val);
+	}
+val = clean_local_selection_data (val);
+}
+UNGCPRO;
+return val;
+}
+void
+syms_of_select (void)
+{
+DEFSUBR (Fown_selection_internal);
+DEFSUBR (Fget_selection_internal);
+DEFSUBR (Fselection_exists_p);
+DEFSUBR (Fdisown_selection_internal);
+DEFSUBR (Fselection_owner_p);
+defsymbol (&QPRIMARY, "PRIMARY");
+defsymbol (&QSECONDARY, "SECONDARY");
+defsymbol (&QSTRING, "STRING");
+defsymbol (&QINTEGER, "INTEGER");
+defsymbol (&QCLIPBOARD, "CLIPBOARD");
+defsymbol (&QTIMESTAMP, "TIMESTAMP");
+defsymbol (&QTEXT, "TEXT");
+defsymbol (&QDELETE, "DELETE");
+defsymbol (&QMULTIPLE, "MULTIPLE");
+defsymbol (&QINCR, "INCR");
+defsymbol (&QEMACS_TMP, "_EMACS_TMP_");
+defsymbol (&QTARGETS, "TARGETS");
+defsymbol (&QATOM, "ATOM");
+defsymbol (&QATOM_PAIR, "ATOM_PAIR");
+defsymbol (&QCOMPOUND_TEXT, "COMPOUND_TEXT");
+defsymbol (&QNULL, "NULL");
+deferror (&Qselection_conversion_error,
+	    "selection-conversion-error",
+	    "selection-conversion error", Qio_error);
+}
+void
+vars_of_select (void)
+{
+Vselection_alist = Qnil;
+staticpro (&Vselection_alist);
+DEFVAR_LISP ("selection-converter-alist", &Vselection_converter_alist /*
+An alist associating selection-types (such as STRING and TIMESTAMP) with
+functions.  These functions will be called with three args: the name
+of the selection (typically PRIMARY, SECONDARY, or CLIPBOARD); a
+desired type to which the selection should be converted; and the local
+selection value (whatever had been passed to `own-selection').  For
+historical reasons these functions should return the value to send to
+an X server, which should be one of:
+-- nil (the conversion could not be done)
+-- a cons of a symbol and any of the following values; the symbol
+explicitly specifies the type that will be sent.
+-- a string (If the type is not specified, then if Mule support exists,
+the string will be converted to Compound Text and sent in
+the 'COMPOUND_TEXT format; otherwise (no Mule support),
+the string will be left as-is and sent in the 'STRING
+format.  If the type is specified, the string will be
+left as-is (or converted to binary format under Mule).
+In all cases, 8-bit data it sent.)
+-- a character (With Mule support, will be converted to Compound Text
+whether or not a type is specified.  If a type is not
+specified, a type of 'STRING or 'COMPOUND_TEXT will be
+		sent, as for strings.)
+-- the symbol 'NULL (Indicates that there is no meaningful return value.
+Empty 32-bit data with a type of 'NULL will be sent.)
+-- a symbol (Will be converted into an atom.  If the type is not specified,
+a type of 'ATOM will be sent.)
+-- an integer (Will be converted into a 16-bit or 32-bit integer depending
+on the value.  If the type is not specified, a type of
+	       'INTEGER will be sent.)
+-- a cons (HIGH . LOW) of integers (Will be converted into a 32-bit integer.
+If the type is not specified, a type of
+				    'INTEGER will be sent.)
+-- a vector of symbols (Will be converted into a list of atoms.  If the type
+is not specified, a type of 'ATOM will be sent.)
+-- a vector of integers (Will be converted into a list of 16-bit integers.
+If the type is not specified, a type of 'INTEGER
+			 will be sent.)
+-- a vector of integers and/or conses (HIGH . LOW) of integers
+(Will be converted into a list of 16-bit integers.
+If the type is not specified, a type of 'INTEGER
+			 will be sent.)  */ );
+Vselection_converter_alist = Qnil;
+DEFVAR_LISP ("lost-selection-hooks", &Vlost_selection_hooks /*
+A function or functions to be called after we have been notified
+that we have lost the selection.  The function(s) will be called with one
+argument, a symbol naming the selection (typically PRIMARY, SECONDARY, or
+CLIPBOARD).
+*/ );
+Vlost_selection_hooks = Qunbound;
+}

Mercurial > hg > xemacs-beta

comparison src/select.c @ 414:da8ed4261e83 r21-2-15