THE GREAT CEEIFICATION EVENT

This is a total conversion of SciTECO to plain C (GNU C11).
The chance was taken to improve a lot of internal datastructures,
fix fundamental bugs and lay the foundations of future features.
The GTK user interface is now in an useable state!
All changes have been squashed together.

The language itself has almost not changed at all, except for:

* Detection of string terminators (usually Escape) now takes
  the string building characters into account.
  A string is only terminated outside of string building characters.
  In other words, you can now for instance write
  I^EQ[Hello$world]$
  This removes one of the last bits of shellisms which is out of
  place in SciTECO where no tokenization/lexing is performed.
  Consequently, the current termination character can also be
  escaped using ^Q/^R.
  This is used by auto completions to make sure that strings
  are inserted verbatim and without unwanted sideeffects.
* All strings can now safely contain null-characters
  (see also: 8-bit cleanliness).
  The null-character itself (^@) is not (yet) a valid SciTECO
  command, though.

An incomplete list of changes:

* We got rid of the BSD headers for RB trees and lists/queues.
  The problem with them was that they used a form of metaprogramming
  only to gain a bit of type safety. It also resulted in less
  readble code. This was a C++ desease.
  The new code avoids metaprogramming only to gain type safety.
  The BSD tree.h has been replaced by rb3ptr by Jens Stimpfle
  (https://github.com/jstimpfle/rb3ptr).
  This implementation is also more memory efficient than BSD's.
  The BSD list.h and queue.h has been replaced with a custom
  src/list.h.
* Fixed crashes, performance issues and compatibility issues with
  the Gtk 3 User Interface.
  It is now more or less ready for general use.
  The GDK lock is no longer used to avoid using deprecated functions.
  On the downside, the new implementation (driving the Gtk event loop
  stepwise) is even slower than the old one.
  A few glitches remain (see TODO), but it is hoped that they will
  be resolved by the Scintilla update which will be performed soon.
* A lot of program units have been split up, so they are shorter
  and easier to maintain: core-commands.c, qreg-commands.c,
  goto-commands.c, file-utils.h.
* Parser states are simply structs of callbacks now.
  They still use a kind of polymorphy using a preprocessor trick.
  TECO_DEFINE_STATE() takes an initializer list that will be
  merged with the default list of field initializers.
  To "subclass" states, you can simply define new macros that add
  initializers to existing macros.
* Parsers no longer have a "transitions" table but the input_cb()
  may use switch-case statements.
  There are also teco_machine_main_transition_t now which can
  be used to implement simple transitions. Additionally, you
  can specify functions to execute during transitions.
  This largely avoids long switch-case-statements.
* Parsers are embeddable/reusable now, at least in parse-only mode.
  This does not currently bring any advantages but may later
  be used to write a Scintilla lexer for TECO syntax highlighting.
  Once parsers are fully embeddable, it will also be possible
  to run TECO macros in a kind of coroutine which would allow
  them to process string arguments in real time.
* undo.[ch] still uses metaprogramming extensively but via
  the C preprocessor of course. On the downside, most undo
  token generators must be initiated explicitly (theoretically
  we could have used embedded functions / trampolines to
  instantiate automatically but this has turned out to be
  dangereous).
  There is a TECO_DEFINE_UNDO_CALL() to generate closures for
  arbitrary functions now (ie. to call an arbitrary function
  at undo-time). This simplified a lot of code and is much
  shorter than manually pushing undo tokens in many cases.
* Instead of the ridiculous C++ Curiously Recurring Template
  Pattern to achieve static polymorphy for user interface
  implementations, we now simply declare all functions to
  implement in interface.h and link in the implementations.
  This is possible since we no longer hace to define
  interface subclasses (all state is static variables in
  the interface's *.c files).
* Headers are now significantly shorter than in C++ since
  we can often hide more of our "class" implementations.
* Memory counting is based on dlmalloc for most platforms now.
  Unfortunately, there is no malloc implementation that
  provides an efficient constant-time memory counter that
  is guaranteed to decrease when freeing memory.
  But since we use a defined malloc implementation now,
  malloc_usable_size() can be used safely for tracking memory use.
  malloc() replacement is very tricky on Windows, so we
  use a poll thread on Windows. This can also be enabled
  on other supported platforms using --disable-malloc-replacement.
  All in all, I'm still not pleased with the state of memory
  limiting. It is a mess.
* Error handling uses GError now. This has the advantage that
  the GError codes can be reused once we support error catching
  in the SciTECO language.
* Added a few more test suite cases.
* Haiku is no longer supported as builds are instable and
  I did not manage to debug them - quite possibly Haiku bugs
  were responsible.
* Glib v2.44 or later are now required.
  The GTK UI requires Gtk+ v3.12 or later now.
  The GtkFlowBox fallback and sciteco-wrapper workaround are
  no longer required.
* We now extensively use the GCC/Clang-specific g_auto
  feature (automatic deallocations when leaving the current
  code block).
* Updated copyright to 2021.
  SciTECO has been in continuous development, even though there
  have been no commits since 2018.
* Since these changes are so significant, the target release has
  been set to v2.0.
  It is planned that beginning with v3.0, the language will be
  kept stable.

1 files changed, 0 insertions, 1680 deletions

diff --git a/src/qregisters.cpp b/src/qregisters.cpp
deleted file mode 100644
index c23656c..0000000
--- a/src/qregisters.cpp
+++ /dev/null
@@ -1,1680 +0,0 @@
-/*
- * Copyright (C) 2012-2017 Robin Haberkorn
- *
- * 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 3 of the License, 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.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
-
-#include <string.h>
-#include <bsd/sys/queue.h>
-
-#include <glib.h>
-#include <glib/gprintf.h>
-#include <glib/gstdio.h>
-
-#include <Scintilla.h>
-
-#include "sciteco.h"
-#include "string-utils.h"
-#include "interface.h"
-#include "undo.h"
-#include "parser.h"
-#include "expressions.h"
-#include "document.h"
-#include "ring.h"
-#include "ioview.h"
-#include "eol.h"
-#include "error.h"
-#include "qregisters.h"
-
-namespace SciTECO {
-
-namespace States {
-	StatePushQReg		pushqreg;
-	StatePopQReg		popqreg;
-	StateEQCommand		eqcommand;
-	StateLoadQReg		loadqreg;
-	StateEPctCommand	epctcommand;
-	StateSaveQReg		saveqreg;
-	StateQueryQReg		queryqreg;
-	StateCtlUCommand	ctlucommand;
-	StateEUCommand		eucommand;
-	StateSetQRegString	setqregstring_nobuilding(false);
-	StateSetQRegString	setqregstring_building(true);
-	StateGetQRegString	getqregstring;
-	StateSetQRegInteger	setqreginteger;
-	StateIncreaseQReg	increaseqreg;
-	StateMacro		macro;
-	StateMacroFile		macro_file;
-	StateCopyToQReg		copytoqreg;
-}
-
-namespace QRegisters {
-	QRegisterTable		*locals = NULL;
-	QRegister		*current = NULL;
-
-	static QRegisterStack	stack;
-}
-
-static QRegister *register_argument = NULL;
-
-void
-QRegisterData::set_string(const gchar *str, gsize len)
-{
-	if (QRegisters::current)
-		QRegisters::current->string.update(QRegisters::view);
-
-	string.reset();
-	string.edit(QRegisters::view);
-
-	QRegisters::view.ssm(SCI_BEGINUNDOACTION);
-	QRegisters::view.ssm(SCI_CLEARALL);
-	QRegisters::view.ssm(SCI_APPENDTEXT,
-	                     len, (sptr_t)(str ? : ""));
-	QRegisters::view.ssm(SCI_ENDUNDOACTION);
-
-	if (QRegisters::current)
-		QRegisters::current->string.edit(QRegisters::view);
-}
-
-void
-QRegisterData::undo_set_string(void)
-{
-	if (!must_undo)
-		return;
-
-	/*
-	 * Necessary, so that upon rubout the
-	 * string's parameters are restored.
-	 */
-	string.update(QRegisters::view);
-
-	if (QRegisters::current && QRegisters::current->must_undo)
-		QRegisters::current->string.undo_edit(QRegisters::view);
-
-	string.undo_reset();
-	QRegisters::view.undo_ssm(SCI_UNDO);
-
-	string.undo_edit(QRegisters::view);
-}
-
-void
-QRegisterData::append_string(const gchar *str, gsize len)
-{
-	/*
-	 * NOTE: Will not create undo action
-	 * if string is empty.
-	 * Also, appending preserves the string's
-	 * parameters.
-	 */
-	if (!len)
-		return;
-
-	if (QRegisters::current)
-		QRegisters::current->string.update(QRegisters::view);
-
-	string.edit(QRegisters::view);
-
-	QRegisters::view.ssm(SCI_BEGINUNDOACTION);
-	QRegisters::view.ssm(SCI_APPENDTEXT,
-	                     len, (sptr_t)str);
-	QRegisters::view.ssm(SCI_ENDUNDOACTION);
-
-	if (QRegisters::current)
-		QRegisters::current->string.edit(QRegisters::view);
-}
-
-gchar *
-QRegisterData::get_string(void)
-{
-	gint size;
-	gchar *str;
-
-	if (!string.is_initialized())
-		return g_strdup("");
-
-	if (QRegisters::current)
-		QRegisters::current->string.update(QRegisters::view);
-
-	string.edit(QRegisters::view);
-
-	size = QRegisters::view.ssm(SCI_GETLENGTH) + 1;
-	str = (gchar *)g_malloc(size);
-	QRegisters::view.ssm(SCI_GETTEXT, size, (sptr_t)str);
-
-	if (QRegisters::current)
-		QRegisters::current->string.edit(QRegisters::view);
-
-	return str;
-}
-
-gsize
-QRegisterData::get_string_size(void)
-{
-	gsize size;
-
-	if (!string.is_initialized())
-		return 0;
-
-	if (QRegisters::current)
-		QRegisters::current->string.update(QRegisters::view);
-
-	string.edit(QRegisters::view);
-
-	size = QRegisters::view.ssm(SCI_GETLENGTH);
-
-	if (QRegisters::current)
-		QRegisters::current->string.edit(QRegisters::view);
-
-	return size;
-}
-
-gint
-QRegisterData::get_character(gint position)
-{
-	gint ret = -1;
-
-	if (position < 0)
-		return -1;
-
-	if (QRegisters::current)
-		QRegisters::current->string.update(QRegisters::view);
-
-	string.edit(QRegisters::view);
-
-	if (position < QRegisters::view.ssm(SCI_GETLENGTH))
-		ret = QRegisters::view.ssm(SCI_GETCHARAT, position);
-
-	if (QRegisters::current)
-		QRegisters::current->string.edit(QRegisters::view);
-
-	return ret;
-}
-
-void
-QRegisterData::undo_exchange_string(QRegisterData &reg)
-{
-	if (must_undo)
-		string.undo_exchange();
-	if (reg.must_undo)
-		reg.string.undo_exchange();
-}
-
-void
-QRegister::edit(void)
-{
-	if (QRegisters::current)
-		QRegisters::current->string.update(QRegisters::view);
-
-	string.edit(QRegisters::view);
-	interface.show_view(&QRegisters::view);
-	interface.info_update(this);
-}
-
-void
-QRegister::undo_edit(void)
-{
-	/*
-	 * We might be switching the current document
-	 * to a buffer.
-	 */
-	string.update(QRegisters::view);
-
-	if (!must_undo)
-		return;
-
-	interface.undo_info_update(this);
-	string.undo_edit(QRegisters::view);
-	interface.undo_show_view(&QRegisters::view);
-}
-
-void
-QRegister::execute(bool locals)
-{
-	gchar *str = get_string();
-
-	try {
-		Execute::macro(str, locals);
-	} catch (Error &error) {
-		error.add_frame(new Error::QRegFrame(name));
-
-		g_free(str);
-		throw; /* forward */
-	} catch (...) {
-		g_free(str);
-		throw; /* forward */
-	}
-
-	g_free(str);
-}
-
-void
-QRegister::undo_set_eol_mode(void)
-{
-	if (!must_undo)
-		return;
-
-	/*
-	 * Necessary, so that upon rubout the
-	 * string's parameters are restored.
-	 */
-	string.update(QRegisters::view);
-
-	if (QRegisters::current && QRegisters::current->must_undo)
-		QRegisters::current->string.undo_edit(QRegisters::view);
-
-	QRegisters::view.undo_ssm(SCI_SETEOLMODE,
-	                          QRegisters::view.ssm(SCI_GETEOLMODE));
-
-	string.undo_edit(QRegisters::view);
-}
-
-void
-QRegister::set_eol_mode(gint mode)
-{
-	if (QRegisters::current)
-		QRegisters::current->string.update(QRegisters::view);
-
-	string.edit(QRegisters::view);
-	QRegisters::view.ssm(SCI_SETEOLMODE, mode);
-
-	if (QRegisters::current)
-		QRegisters::current->string.edit(QRegisters::view);
-}
-
-void
-QRegister::load(const gchar *filename)
-{
-	undo_set_string();
-
-	if (QRegisters::current)
-		QRegisters::current->string.update(QRegisters::view);
-
-	string.edit(QRegisters::view);
-	string.reset();
-
-	/*
-	 * IOView::load() might change the EOL style.
-	 */
-	undo_set_eol_mode();
-
-	/*
-	 * undo_set_string() pushes undo tokens that restore
-	 * the previous document in the view.
-	 * So if loading fails, QRegisters::current will be
-	 * made the current document again.
-	 */
-	QRegisters::view.load(filename);
-
-	if (QRegisters::current)
-		QRegisters::current->string.edit(QRegisters::view);
-}
-
-void
-QRegister::save(const gchar *filename)
-{
-	if (QRegisters::current)
-		QRegisters::current->string.update(QRegisters::view);
-
-	string.edit(QRegisters::view);
-
-	try {
-		QRegisters::view.save(filename);
-	} catch (...) {
-		if (QRegisters::current)
-			QRegisters::current->string.edit(QRegisters::view);
-		throw; /* forward */
-	}
-
-	if (QRegisters::current)
-		QRegisters::current->string.edit(QRegisters::view);
-}
-
-tecoInt
-QRegisterBufferInfo::set_integer(tecoInt v)
-{
-	if (!ring.edit(v))
-		throw Error("Invalid buffer id %" TECO_INTEGER_FORMAT, v);
-
-	return v;
-}
-
-void
-QRegisterBufferInfo::undo_set_integer(void)
-{
-	current_doc_undo_edit();
-}
-
-tecoInt
-QRegisterBufferInfo::get_integer(void)
-{
-	return ring.get_id();
-}
-
-gchar *
-QRegisterBufferInfo::get_string(void)
-{
-	gchar *str = g_strdup(ring.current->filename ? : "");
-
-	/*
-	 * On platforms with a default non-forward-slash directory
-	 * separator (i.e. Windows), Buffer::filename will have
-	 * the wrong separator.
-	 * To make the life of macros that evaluate "*" easier,
-	 * the directory separators are normalized to "/" here.
-	 * This does not change the size of the string, so
-	 * get_string_size() still works.
-	 */
-	return normalize_path(str);
-}
-
-gsize
-QRegisterBufferInfo::get_string_size(void)
-{
-	return ring.current->filename ? strlen(ring.current->filename) : 0;
-}
-
-gint
-QRegisterBufferInfo::get_character(gint position)
-{
-	if (position < 0 ||
-	    position >= (gint)QRegisterBufferInfo::get_string_size())
-		return -1;
-
-	return ring.current->filename[position];
-}
-
-void
-QRegisterBufferInfo::edit(void)
-{
-	gchar *str;
-
-	QRegister::edit();
-
-	QRegisters::view.ssm(SCI_BEGINUNDOACTION);
-	str = QRegisterBufferInfo::get_string();
-	QRegisters::view.ssm(SCI_SETTEXT, 0, (sptr_t)str);
-	g_free(str);
-	QRegisters::view.ssm(SCI_ENDUNDOACTION);
-
-	QRegisters::view.undo_ssm(SCI_UNDO);
-}
-
-void
-QRegisterWorkingDir::set_string(const gchar *str, gsize len)
-{
-	/* str is not null-terminated */
-	gchar *dir = g_strndup(str, len);
-	int ret = g_chdir(dir);
-
-	g_free(dir);
-
-	if (ret)
-		/* FIXME: Is errno usable on Windows here? */
-		throw Error("Cannot change working directory "
-		            "to \"%.*s\"", (int)len, str);
-}
-
-void
-QRegisterWorkingDir::undo_set_string(void)
-{
-	/* pass ownership of current dir string */
-	undo.push_own<UndoTokenChangeDir>(g_get_current_dir());
-}
-
-gchar *
-QRegisterWorkingDir::get_string(void)
-{
-	/*
-	 * On platforms with a default non-forward-slash directory
-	 * separator (i.e. Windows), Buffer::filename will have
-	 * the wrong separator.
-	 * To make the life of macros that evaluate "$" easier,
-	 * the directory separators are normalized to "/" here.
-	 * This does not change the size of the string, so
-	 * get_string_size() still works.
-	 */
-	return normalize_path(g_get_current_dir());
-}
-
-gsize
-QRegisterWorkingDir::get_string_size(void)
-{
-	gchar *str = g_get_current_dir();
-	gsize len = strlen(str);
-
-	g_free(str);
-	return len;
-}
-
-gint
-QRegisterWorkingDir::get_character(gint position)
-{
-	gchar *str = QRegisterWorkingDir::get_string();
-	gint ret = -1;
-
-	if (position >= 0 &&
-	    position < (gint)strlen(str))
-		ret = str[position];
-
-	g_free(str);
-	return ret;
-}
-
-void
-QRegisterWorkingDir::edit(void)
-{
-	gchar *str;
-
-	QRegister::edit();
-
-	QRegisters::view.ssm(SCI_BEGINUNDOACTION);
-	str = QRegisterWorkingDir::get_string();
-	QRegisters::view.ssm(SCI_SETTEXT, 0, (sptr_t)str);
-	g_free(str);
-	QRegisters::view.ssm(SCI_ENDUNDOACTION);
-
-	QRegisters::view.undo_ssm(SCI_UNDO);
-}
-
-void
-QRegisterWorkingDir::exchange_string(QRegisterData &reg)
-{
-	gchar *own_str = QRegisterWorkingDir::get_string();
-	gchar *other_str = reg.get_string();
-
-	QRegisterData::set_string(other_str);
-	g_free(other_str);
-	reg.set_string(own_str);
-	g_free(own_str);
-}
-
-void
-QRegisterWorkingDir::undo_exchange_string(QRegisterData &reg)
-{
-	QRegisterWorkingDir::undo_set_string();
-	reg.undo_set_string();
-}
-
-void
-QRegisterClipboard::UndoTokenSetClipboard::run(void)
-{
-	interface.set_clipboard(name, str, str_len);
-}
-
-void
-QRegisterClipboard::set_string(const gchar *str, gsize len)
-{
-	if (Flags::ed & Flags::ED_AUTOEOL) {
-		GString *str_converted = g_string_sized_new(len);
-		/*
-		 * This will convert to the Q-Register view's EOL mode.
-		 */
-		EOLWriterMem writer(str_converted,
-		                    QRegisters::view.ssm(SCI_GETEOLMODE));
-		gsize bytes_written;
-
-		/*
-		 * NOTE: Shouldn't throw any error, ever.
-		 */
-		bytes_written = writer.convert(str, len);
-		g_assert(bytes_written == len);
-
-		interface.set_clipboard(get_clipboard_name(),
-		                        str_converted->str, str_converted->len);
-
-		g_string_free(str_converted, TRUE);
-	} else {
-		/*
-		 * No EOL conversion necessary. The EOLWriter can handle
-		 * this as well, but will result in unnecessary allocations.
-		 */
-		interface.set_clipboard(get_clipboard_name(), str, len);
-	}
-}
-
-void
-QRegisterClipboard::undo_set_string(void)
-{
-	gchar *str;
-	gsize str_len;
-
-	/*
-	 * Upon rubout, the current contents of the clipboard are
-	 * restored.
-	 * We are checking for undo.enabled instead of relying on
-	 * undo.push_own(), since getting the clipboard
-	 * is an expensive operation that we want to avoid.
-	 */
-	if (!undo.enabled)
-		return;
-
-	/*
-	 * Ownership of str (may be NULL) is passed to
-	 * the undo token. We do not need undo.push_own() since
-	 * we checked for undo.enabled before.
-	 * This avoids any EOL translation as that would be cumbersome
-	 * and could also modify the clipboard in unexpected ways.
-	 */
-	str = interface.get_clipboard(get_clipboard_name(), &str_len);
-	undo.push<UndoTokenSetClipboard>(get_clipboard_name(), str, str_len);
-}
-
-gchar *
-QRegisterClipboard::get_string(gsize *out_len)
-{
-	if (!(Flags::ed & Flags::ED_AUTOEOL)) {
-		/*
-		 * No auto-eol conversion - avoid unnecessary copying
-		 * and allocations.
-		 * NOTE: get_clipboard() already returns a null-terminated string.
-		 */
-		return interface.get_clipboard(get_clipboard_name(), out_len);
-	}
-
-	gsize str_len;
-	gchar *str = interface.get_clipboard(get_clipboard_name(), &str_len);
-	EOLReaderMem reader(str, str_len);
-	gchar *str_converted;
-
-	try {
-		str_converted = reader.convert_all(out_len);
-	} catch (...) {
-		g_free(str);
-		throw; /* forward */
-	}
-	g_free(str);
-
-	return str_converted;
-}
-
-gchar *
-QRegisterClipboard::get_string(void)
-{
-	return QRegisterClipboard::get_string(NULL);
-}
-
-gsize
-QRegisterClipboard::get_string_size(void)
-{
-	gsize str_len;
-	gchar *str = interface.get_clipboard(get_clipboard_name(), &str_len);
-	/*
-	 * Using the EOLReader does not hurt much if AutoEOL is disabled
-	 * since we use it only for counting the bytes.
-	 */
-	EOLReaderMem reader(str, str_len);
-	gsize data_len;
-	gsize converted_len = 0;
-
-	try {
-		while (reader.convert(data_len))
-			converted_len += data_len;
-	} catch (...) {
-		g_free(str);
-		throw; /* forward */
-	}
-	g_free(str);
-
-	return converted_len;
-}
-
-gint
-QRegisterClipboard::get_character(gint position)
-{
-	gsize str_len;
-	gchar *str = QRegisterClipboard::get_string(&str_len);
-	gint ret = -1;
-
-	/*
-	 * `str` may be NULL, but only if str_len == 0 as well.
-	 */
-	if (position >= 0 &&
-	    position < (gint)str_len)
-		ret = str[position];
-
-	g_free(str);
-	return ret;
-}
-
-void
-QRegisterClipboard::edit(void)
-{
-	gchar *str;
-	gsize str_len;
-
-	QRegister::edit();
-
-	QRegisters::view.ssm(SCI_BEGINUNDOACTION);
-	QRegisters::view.ssm(SCI_CLEARALL);
-	str = QRegisterClipboard::get_string(&str_len);
-	QRegisters::view.ssm(SCI_APPENDTEXT, str_len, (sptr_t)str);
-	g_free(str);
-	QRegisters::view.ssm(SCI_ENDUNDOACTION);
-
-	QRegisters::view.undo_ssm(SCI_UNDO);
-}
-
-void
-QRegisterClipboard::exchange_string(QRegisterData &reg)
-{
-	gchar *own_str;
-	gsize own_str_len;
-	gchar *other_str = reg.get_string();
-	gsize other_str_len = reg.get_string_size();
-
-	/*
-	 * FIXME: What if `reg` is a clipboard and it changes
-	 * between the two calls?
-	 * QRegister::get_string() should always return the length as well.
-	 */
-	QRegisterData::set_string(other_str, other_str_len);
-	g_free(other_str);
-	own_str = QRegisterClipboard::get_string(&own_str_len);
-	reg.set_string(own_str, own_str_len);
-	g_free(own_str);
-}
-
-void
-QRegisterClipboard::undo_exchange_string(QRegisterData &reg)
-{
-	QRegisterClipboard::undo_set_string();
-	reg.undo_set_string();
-}
-
-void
-QRegisterTable::UndoTokenRemoveGlobal::run(void)
-{
-	delete (QRegister *)QRegisters::globals.remove(reg);
-}
-
-void
-QRegisterTable::UndoTokenRemoveLocal::run(void)
-{
-	/*
-	 * NOTE: QRegisters::locals should point
-	 * to the correct table when the token is
-	 * executed.
-	 */
-	delete (QRegister *)QRegisters::locals->remove(reg);
-}
-
-void
-QRegisterTable::undo_remove(QRegister *reg)
-{
-	if (!must_undo)
-		return;
-
-	/*
-	 * NOTE: Could also be solved using a virtual
-	 * method and subclasses...
-	 */
-	if (this == &QRegisters::globals)
-		undo.push<UndoTokenRemoveGlobal>(reg);
-	else
-		undo.push<UndoTokenRemoveLocal>(reg);
-}
-
-void
-QRegisterTable::insert_defaults(void)
-{
-	/* general purpose registers */
-	for (gchar q = 'A'; q <= 'Z'; q++)
-		insert(q);
-	for (gchar q = '0'; q <= '9'; q++)
-		insert(q);
-}
-
-/*
- * NOTE: by not making this inline,
- * we can access QRegisters::current
- */
-void
-QRegisterTable::edit(QRegister *reg)
-{
-	reg->edit();
-	QRegisters::current = reg;
-}
-
-/**
- * Import process environment into table
- * by setting environment registers for every
- * environment variable.
- * It is assumed that the table does not yet
- * contain any environment register.
- *
- * In general this method is only safe to call
- * at startup.
- */
-void
-QRegisterTable::set_environ(void)
-{
-	/*
-	 * NOTE: Using g_get_environ() would be more efficient,
-	 * but it appears to be broken, at least on Wine
-	 * and Windows 2000.
-	 */
-	gchar **env = g_listenv();
-
-	for (gchar **key = env; *key; key++) {
-		gchar name[1 + strlen(*key) + 1];
-		QRegister *reg;
-
-		name[0] = '$';
-		strcpy(name + 1, *key);
-
-		reg = insert(name);
-		reg->set_string(g_getenv(*key));
-	}
-
-	g_strfreev(env);
-}
-
-/**
- * Export environment registers as a list of environment
- * variables compatible with `g_get_environ()`.
- *
- * @return Zero-terminated list of strings in the form
- *         `NAME=VALUE`. Should be freed with `g_strfreev()`.
- */
-gchar **
-QRegisterTable::get_environ(void)
-{
-	QRegister *first = nfind("$");
-
-	gint envp_len = 1;
-	gchar **envp, **p;
-
-	/*
-	 * Iterate over all registers beginning with "$" to
-	 * guess the size required for the environment array.
-	 * This may waste a few bytes because not __every__
-	 * register beginning with "$" is an environment
-	 * register.
-	 */
-	for (QRegister *cur = first;
-	     cur && cur->name[0] == '$';
-	     cur = (QRegister *)cur->next())
-		envp_len++;
-
-	p = envp = (gchar **)g_malloc(sizeof(gchar *)*envp_len);
-
-	for (QRegister *cur = first;
-	     cur && cur->name[0] == '$';
-	     cur = (QRegister *)cur->next()) {
-		gchar *value;
-
-		/*
-		 * Ignore the "$" register (not an environment
-		 * variable register) and registers whose
-		 * name contains "=" (not allowed in environment
-		 * variable names).
-		 */
-		if (!cur->name[1] || strchr(cur->name+1, '='))
-			continue;
-
-		value = cur->get_string();
-		/* more efficient than g_environ_setenv() */
-		*p++ = g_strconcat(cur->name+1, "=", value, NIL);
-		g_free(value);
-	}
-
-	*p = NULL;
-
-	return envp;
-}
-
-/**
- * Update process environment with environment registers
- * using `g_setenv()`.
- * It does not try to unset environment variables that
- * are no longer in the Q-Register table.
- *
- * This method may be dangerous in a multi-threaded environment
- * but may be necessary for libraries that access important
- * environment variables internally without providing alternative
- * APIs.
- */
-void
-QRegisterTable::update_environ(void)
-{
-	for (QRegister *cur = nfind("$");
-	     cur && cur->name[0] == '$';
-	     cur = (QRegister *)cur->next()) {
-		gchar *value;
-
-		/*
-		 * Ignore the "$" register (not an environment
-		 * variable register) and registers whose
-		 * name contains "=" (not allowed in environment
-		 * variable names).
-		 */
-		if (!cur->name[1] || strchr(cur->name+1, '='))
-			continue;
-
-		value = cur->get_string();
-		g_setenv(cur->name+1, value, TRUE);
-		g_free(value);
-	}
-}
-
-/**
- * Free resources associated with table.
- *
- * This is similar to the destructor but
- * has the advantage that we can check whether some
- * register is currently edited.
- * Since this is not a destructor, we can throw
- * errors.
- * Therefore this method should be called before
- * a (local) QRegisterTable is deleted.
- */
-void
-QRegisterTable::clear(void)
-{
-	QRegister *cur;
-
-	while ((cur = (QRegister *)root())) {
-		if (cur == QRegisters::current)
-			throw Error("Currently edited Q-Register \"%s\" "
-			            "cannot be discarded", cur->name);
-
-		delete (QRegister *)remove(cur);
-	}
-}
-
-void
-QRegisterStack::UndoTokenPush::run(void)
-{
-	SLIST_INSERT_HEAD(&stack->head, entry, entries);
-	entry = NULL;
-}
-
-void
-QRegisterStack::UndoTokenPop::run(void)
-{
-	Entry *entry = SLIST_FIRST(&stack->head);
-
-	SLIST_REMOVE_HEAD(&stack->head, entries);
-	delete entry;
-}
-
-void
-QRegisterStack::push(QRegister &reg)
-{
-	Entry *entry = new Entry();
-
-	gchar *str = reg.get_string();
-	if (*str)
-		entry->set_string(str);
-	g_free(str);
-	entry->string.update(reg.string);
-	entry->set_integer(reg.get_integer());
-
-	SLIST_INSERT_HEAD(&head, entry, entries);
-	undo.push<UndoTokenPop>(this);
-}
-
-bool
-QRegisterStack::pop(QRegister &reg)
-{
-	Entry *entry = SLIST_FIRST(&head);
-
-	if (!entry)
-		return false;
-
-	reg.undo_set_integer();
-	reg.set_integer(entry->get_integer());
-
-	/* exchange document ownership between Stack entry and Q-Register */
-	reg.undo_exchange_string(*entry);
-	reg.exchange_string(*entry);
-
-	SLIST_REMOVE_HEAD(&head, entries);
-	/* Pass entry ownership to undo stack. */
-	undo.push_own<UndoTokenPush>(this, entry);
-
-	return true;
-}
-
-QRegisterStack::~QRegisterStack()
-{
-	Entry *entry, *next;
-
-	SLIST_FOREACH_SAFE(entry, &head, entries, next)
-		delete entry;
-}
-
-void
-QRegisters::hook(Hook type)
-{
-	static const gchar *type2name[] = {
-		/* [HOOK_ADD-1] = */	"ADD",
-		/* [HOOK_EDIT-1] = */	"EDIT",
-		/* [HOOK_CLOSE-1] = */	"CLOSE",
-		/* [HOOK_QUIT-1] = */	"QUIT",
-	};
-
-	QRegister *reg;
-
-	if (!(Flags::ed & Flags::ED_HOOKS))
-		return;
-
-	try {
-		reg = globals["ED"];
-		if (!reg)
-			throw Error("Undefined ED-hook register (\"ED\")");
-
-		/*
-		 * ED-hook execution should not see any
-		 * integer parameters but the hook type.
-		 * Such parameters could confuse the ED macro
-		 * and macro authors do not expect side effects
-		 * of ED macros on the expression stack.
-		 * Also make sure it does not leave behind
-		 * additional arguments on the stack.
-		 *
-		 * So this effectively executes:
-		 * (typeM[ED]^[)
-		 */
-		expressions.brace_open();
-		expressions.push(type);
-		reg->execute();
-		expressions.discard_args();
-		expressions.brace_close();
-	} catch (Error &error) {
-		const gchar *type_str = type2name[type-1];
-
-		error.add_frame(new Error::EDHookFrame(type_str));
-		throw; /* forward */
-	}
-}
-
-void
-QRegSpecMachine::reset(void)
-{
-	MicroStateMachine<QRegister *>::reset();
-	string_machine.reset();
-	undo.push_var(is_local) = false;
-	undo.push_var(nesting) = 0;
-	undo.push_str(name);
-	g_free(name);
-	name = NULL;
-}
-
-bool
-QRegSpecMachine::input(gchar chr, QRegister *&result)
-{
-	gchar *insert;
-
-MICROSTATE_START;
-	switch (chr) {
-	case '#':
-		set(&&StateFirstChar);
-		break;
-	case '[':
-		set(&&StateString);
-		undo.push_var(nesting)++;
-		break;
-	case '.':
-		if (!is_local) {
-			undo.push_var(is_local) = true;
-			break;
-		}
-		/* fall through */
-	default:
-		undo.push_str(name) = String::chrdup(String::toupper(chr));
-		goto done;
-	}
-
-	return false;
-
-StateFirstChar:
-	undo.push_str(name) = (gchar *)g_malloc(3);
-	name[0] = String::toupper(chr);
-	name[1] = '\0';
-	set(&&StateSecondChar);
-	return false;
-
-StateSecondChar:
-	name[1] = String::toupper(chr);
-	name[2] = '\0';
-	goto done;
-
-StateString:
-	switch (chr) {
-	case '[':
-		undo.push_var(nesting)++;
-		break;
-	case ']':
-		undo.push_var(nesting)--;
-		if (!nesting)
-			goto done;
-		break;
-	}
-
-	if (mode > MODE_NORMAL)
-		return false;
-
-	if (!string_machine.input(chr, insert))
-		return false;
-
-	undo.push_str(name);
-	String::append(name, insert);
-	g_free(insert);
-	return false;
-
-done:
-	if (mode > MODE_NORMAL) {
-		/*
-		 * StateExpectQRegs with type != OPTIONAL
-		 * will never see this NULL pointer beyond
-		 * BEGIN_EXEC()
-		 */
-		result = NULL;
-		return true;
-	}
-
-	QRegisterTable &table = is_local ? *QRegisters::locals
-	                                 : QRegisters::globals;
-
-	switch (type) {
-	case QREG_REQUIRED:
-		result = table[name];
-		if (!result)
-			fail();
-		break;
-
-	case QREG_OPTIONAL:
-		result = table[name];
-		break;
-
-	case QREG_OPTIONAL_INIT:
-		result = table[name];
-		if (!result) {
-			result = table.insert(name);
-			table.undo_remove(result);
-		}
-		break;
-	}
-
-	return true;
-}
-
-gchar *
-QRegSpecMachine::auto_complete(void)
-{
-	gsize restrict_len = 0;
-
-	if (string_machine.qregspec_machine)
-		/* nested Q-Reg definition */
-		return string_machine.qregspec_machine->auto_complete();
-
-	if (state == StateStart)
-		/* single-letter Q-Reg */
-		restrict_len = 1;
-	else if (!nesting)
-		/* two-letter Q-Reg */
-		restrict_len = 2;
-
-	QRegisterTable &table = is_local ? *QRegisters::locals
-	                                 : QRegisters::globals;
-	return table.auto_complete(name, nesting == 1 ? ']' : '\0',
-	                           restrict_len);
-}
-
-/*
- * Command states
- */
-
-StateExpectQReg::StateExpectQReg(QRegSpecType type) : machine(type)
-{
-	transitions['\0'] = this;
-}
-
-State *
-StateExpectQReg::custom(gchar chr)
-{
-	QRegister *reg;
-
-	if (!machine.input(chr, reg))
-		return this;
-
-	return got_register(reg);
-}
-
-/*$ "[" "[q" push
- * [q -- Save Q-Register
- *
- * Save Q-Register <q> contents on the global Q-Register push-down
- * stack.
- */
-State *
-StatePushQReg::got_register(QRegister *reg)
-{
-	machine.reset();
-
-	BEGIN_EXEC(&States::start);
-	QRegisters::stack.push(*reg);
-	return &States::start;
-}
-
-/*$ "]" "]q" pop
- * ]q -- Restore Q-Register
- *
- * Restore Q-Register <q> by replacing its contents
- * with the contents of the register saved on top of
- * the Q-Register push-down stack.
- * The stack entry is popped.
- *
- * In interactive mode, the original contents of <q>
- * are not immediately reclaimed but are kept in memory
- * to support rubbing out the command.
- * Memory is reclaimed on command-line termination.
- */
-State *
-StatePopQReg::got_register(QRegister *reg)
-{
-	machine.reset();
-
-	BEGIN_EXEC(&States::start);
-
-	if (!QRegisters::stack.pop(*reg))
-		throw Error("Q-Register stack is empty");
-
-	return &States::start;
-}
-
-/*$ EQ EQq
- * EQq$ -- Edit or load Q-Register
- * EQq[file]$
- *
- * When specified with an empty <file> string argument,
- * EQ makes <q> the currently edited Q-Register.
- * Otherwise, when <file> is specified, it is the
- * name of a file to read into Q-Register <q>.
- * When loading a file, the currently edited
- * buffer/register is not changed and the edit position
- * of register <q> is reset to 0.
- *
- * Undefined Q-Registers will be defined.
- * The command fails if <file> could not be read.
- */
-State *
-StateEQCommand::got_register(QRegister *reg)
-{
-	machine.reset();
-
-	BEGIN_EXEC(&States::loadqreg);
-	undo.push_var(register_argument) = reg;
-	return &States::loadqreg;
-}
-
-State *
-StateLoadQReg::got_file(const gchar *filename)
-{
-	BEGIN_EXEC(&States::start);
-
-	if (*filename) {
-		/* Load file into Q-Register */
-		register_argument->load(filename);
-	} else {
-		/* Edit Q-Register */
-		current_doc_undo_edit();
-		QRegisters::globals.edit(register_argument);
-	}
-
-	return &States::start;
-}
-
-/*$ E% E%q
- * E%q<file>$ -- Save Q-Register string to file
- *
- * Saves the string contents of Q-Register <q> to
- * <file>.
- * The <file> must always be specified, as Q-Registers
- * have no notion of associated file names.
- *
- * In interactive mode, the E% command may be rubbed out,
- * restoring the previous state of <file>.
- * This follows the same rules as with the \fBEW\fP command.
- *
- * File names may also be tab-completed and string building
- * characters are enabled by default.
- */
-State *
-StateEPctCommand::got_register(QRegister *reg)
-{
-	machine.reset();
-
-	BEGIN_EXEC(&States::saveqreg);
-	undo.push_var(register_argument) = reg;
-	return &States::saveqreg;
-}
-
-State *
-StateSaveQReg::got_file(const gchar *filename)
-{
-	BEGIN_EXEC(&States::start);
-	register_argument->save(filename);
-	return &States::start;
-}
-
-/*$ Q Qq query
- * Qq -> n -- Query Q-Register existence, its integer or string characters
- * <position>Qq -> character
- * :Qq -> -1 | size
- *
- * Without any arguments, get and return the integer-part of
- * Q-Register <q>.
- *
- * With one argument, return the <character> code at <position>
- * from the string-part of Q-Register <q>.
- * Positions are handled like buffer positions \(em they
- * begin at 0 up to the length of the string minus 1.
- * An error is thrown for invalid positions.
- * Both non-colon-modified forms of Q require register <q>
- * to be defined and fail otherwise.
- *
- * When colon-modified, Q does not pop any arguments from
- * the expression stack and returns the <size> of the string
- * in Q-Register <q> if register <q> exists (i.e. is defined).
- * Naturally, for empty strings, 0 is returned.
- * When colon-modified and Q-Register <q> is undefined,
- * -1 is returned instead.
- * Therefore checking the return value \fB:Q\fP for values smaller
- * 0 allows checking the existence of a register.
- * Note that if <q> exists, its string part is not initialized,
- * so \fB:Q\fP may be used to handle purely numeric data structures
- * without creating Scintilla documents by accident.
- * These semantics allow the useful idiom \(lq:Q\fIq\fP">\(rq for
- * checking whether a Q-Register exists and has a non-empty string.
- * Note also that the return value of \fB:Q\fP may be interpreted
- * as a condition boolean that represents the non-existence of <q>.
- * If <q> is undefined, it returns \fIsuccess\fP, else a \fIfailure\fP
- * boolean.
- */
-State *
-StateQueryQReg::got_register(QRegister *reg)
-{
-	/* like BEGIN_EXEC(&States::start), but resets machine */
-	if (mode > MODE_NORMAL)
-		goto reset;
-
-	expressions.eval();
-
-	if (eval_colon()) {
-		/* Query Q-Register's existence or string size */
-		expressions.push(reg ? reg->get_string_size()
-		                     : (tecoInt)-1);
-		goto reset;
-	}
-
-	/*
-	 * NOTE: This command is special since the QRegister is required
-	 * without colon and otherwise optional.
-	 * While it may be clearer to model this as two States,
-	 * we cannot currently let parsing depend on the colon-modifier.
-	 * That's why we have to declare the Q-Reg machine as QREG_OPTIONAL
-	 * and care about exception throwing on our own.
-	 */
-	if (!reg)
-		machine.fail();
-
-	if (expressions.args() > 0) {
-		/* Query character from Q-Register string */
-		gint c = reg->get_character(expressions.pop_num_calc());
-		if (c < 0)
-			throw RangeError('Q');
-		expressions.push(c);
-	} else {
-		/* Query integer */
-		expressions.push(reg->get_integer());
-	}
-
-reset:
-	machine.reset();
-	return &States::start;
-}
-
-/*$ ^Uq
- * [c1,c2,...]^Uq[string]$ -- Set or append to Q-Register string without string building
- * [c1,c2,...]:^Uq[string]$
- *
- * If not colon-modified, it first fills the Q-Register <q>
- * with all the values on the expression stack (interpreted as
- * codepoints).
- * It does so in the order of the arguments, i.e.
- * <c1> will be the first character in <q>, <c2> the second, etc.
- * Eventually the <string> argument is appended to the
- * register.
- * Any existing string value in <q> is overwritten by this operation.
- *
- * In the colon-modified form ^U does not overwrite existing
- * contents of <q> but only appends to it.
- *
- * If <q> is undefined, it will be defined.
- *
- * String-building characters are \fBdisabled\fP for ^U
- * commands.
- * Therefore they are especially well-suited for defining
- * \*(ST macros, since string building characters in the
- * desired Q-Register contents do not have to be escaped.
- * The \fBEU\fP command may be used where string building
- * is desired.
- */
-State *
-StateCtlUCommand::got_register(QRegister *reg)
-{
-	machine.reset();
-
-	BEGIN_EXEC(&States::setqregstring_nobuilding);
-	undo.push_var(register_argument) = reg;
-	return &States::setqregstring_nobuilding;
-}
-
-/*$ EU EUq
- * [c1,c2,...]EUq[string]$ -- Set or append to Q-Register string with string building characters
- * [c1,c2,...]:EUq[string]$
- *
- * This command sets or appends to the contents of
- * Q-Register \fIq\fP.
- * It is identical to the \fB^U\fP command, except
- * that this form of the command has string building
- * characters \fBenabled\fP.
- */
-State *
-StateEUCommand::got_register(QRegister *reg)
-{
-	machine.reset();
-
-	BEGIN_EXEC(&States::setqregstring_building);
-	undo.push_var(register_argument) = reg;
-	return &States::setqregstring_building;
-}
-
-void
-StateSetQRegString::initial(void)
-{
-	int args;
-
-	expressions.eval();
-	args = expressions.args();
-	text_added = args > 0;
-	if (!args)
-		return;
-
-	gchar buffer[args+1];
-
-	buffer[args] = '\0';
-	while (args--)
-		buffer[args] = (gchar)expressions.pop_num_calc();
-
-	if (eval_colon()) {
-		/* append to register */
-		register_argument->undo_append_string();
-		register_argument->append_string(buffer);
-	} else {
-		/* set register */
-		register_argument->undo_set_string();
-		register_argument->set_string(buffer);
-	}
-}
-
-State *
-StateSetQRegString::done(const gchar *str)
-{
-	BEGIN_EXEC(&States::start);
-
-	if (text_added || eval_colon()) {
-		/*
-		 * Append to register:
-		 * Note that append_string() does not create an UNDOACTION
-		 * if str == NULL
-		 */
-		if (str) {
-			register_argument->undo_append_string();
-			register_argument->append_string(str);
-		}
-	} else {
-		/* set register */
-		register_argument->undo_set_string();
-		register_argument->set_string(str);
-	}
-
-	return &States::start;
-}
-
-/*$ G Gq get
- * Gq -- Insert Q-Register string
- *
- * Inserts the string of Q-Register <q> into the buffer
- * at its current position.
- * Specifying an undefined <q> yields an error.
- */
-State *
-StateGetQRegString::got_register(QRegister *reg)
-{
-	gchar *str;
-
-	machine.reset();
-
-	BEGIN_EXEC(&States::start);
-
-	str = reg->get_string();
-	if (*str) {
-		interface.ssm(SCI_BEGINUNDOACTION);
-		interface.ssm(SCI_ADDTEXT, strlen(str), (sptr_t)str);
-		interface.ssm(SCI_SCROLLCARET);
-		interface.ssm(SCI_ENDUNDOACTION);
-		ring.dirtify();
-
-		interface.undo_ssm(SCI_UNDO);
-	}
-	g_free(str);
-
-	return &States::start;
-}
-
-/*$ U Uq
- * nUq -- Set Q-Register integer
- * -Uq
- * [n]:Uq -> Success|Failure
- *
- * Sets the integer-part of Q-Register <q> to <n>.
- * \(lq-U\(rq is equivalent to \(lq-1U\(rq, otherwise
- * the command fails if <n> is missing.
- *
- * If the command is colon-modified, it returns a success
- * boolean if <n> or \(lq-\(rq is given.
- * Otherwise it returns a failure boolean and does not
- * modify <q>.
- *
- * The register is defined if it does not exist.
- */
-State *
-StateSetQRegInteger::got_register(QRegister *reg)
-{
-	machine.reset();
-
-	BEGIN_EXEC(&States::start);
-
-	expressions.eval();
-	if (expressions.args() || expressions.num_sign < 0) {
-		reg->undo_set_integer();
-		reg->set_integer(expressions.pop_num_calc());
-
-		if (eval_colon())
-			expressions.push(SUCCESS);
-	} else if (eval_colon()) {
-		expressions.push(FAILURE);
-	} else {
-		throw ArgExpectedError('U');
-	}
-
-	return &States::start;
-}
-
-/*$ % %q increment
- * [n]%q -> q+n -- Increase Q-Register integer
- *
- * Add <n> to the integer part of register <q>, returning
- * its new value.
- * <q> will be defined if it does not exist.
- */
-State *
-StateIncreaseQReg::got_register(QRegister *reg)
-{
-	tecoInt res;
-
-	machine.reset();
-
-	BEGIN_EXEC(&States::start);
-
-	reg->undo_set_integer();
-	res = reg->get_integer() + expressions.pop_num_calc();
-	expressions.push(reg->set_integer(res));
-
-	return &States::start;
-}
-
-/*$ M Mq eval
- * Mq -- Execute macro
- * :Mq
- *
- * Execute macro stored in string of Q-Register <q>.
- * The command itself does not push or pop and arguments from the stack
- * but the macro executed might well do so.
- * The new macro invocation level will contain its own go-to label table
- * and local Q-Register table.
- * Except when the command is colon-modified - in this case, local
- * Q-Registers referenced in the macro refer to the parent macro-level's
- * local Q-Register table (or whatever level defined one last).
- *
- * Errors during the macro execution will propagate to the M command.
- * In other words if a command in the macro fails, the M command will fail
- * and this failure propagates until the top-level macro (e.g.
- * the command-line macro).
- *
- * Note that the string of <q> will be copied upon macro execution,
- * so subsequent changes to Q-Register <q> from inside the macro do
- * not modify the executed code.
- */
-State *
-StateMacro::got_register(QRegister *reg)
-{
-	machine.reset();
-
-	BEGIN_EXEC(&States::start);
-	/* don't create new local Q-Registers if colon modifier is given */
-	reg->execute(!eval_colon());
-	return &States::start;
-}
-
-/*$ EM
- * EMfile$ -- Execute macro from file
- * :EMfile$
- *
- * Read the file with name <file> into memory and execute its contents
- * as a macro.
- * It is otherwise similar to the \(lqM\(rq command.
- *
- * If <file> could not be read, the command yields an error.
- */
-State *
-StateMacroFile::got_file(const gchar *filename)
-{
-	BEGIN_EXEC(&States::start);
-	/* don't create new local Q-Registers if colon modifier is given */
-	Execute::file(filename, !eval_colon());
-	return &States::start;
-}
-
-/*$ X Xq
- * [lines]Xq -- Copy into or append to Q-Register
- * -Xq
- * from,toXq
- * [lines]:Xq
- * -:Xq
- * from,to:Xq
- *
- * Copy the next or previous number of <lines> from the buffer
- * into the Q-Register <q> string.
- * If <lines> is omitted, the sign prefix is implied.
- * If two arguments are specified, the characters beginning
- * at position <from> up to the character at position <to>
- * are copied.
- * The semantics of the arguments is analogous to the K
- * command's arguments.
- * If the command is colon-modified, the characters will be
- * appended to the end of register <q> instead.
- *
- * Register <q> will be created if it is undefined.
- */
-State *
-StateCopyToQReg::got_register(QRegister *reg)
-{
-	tecoInt from, len;
-	Sci_TextRange tr;
-
-	machine.reset();
-
-	BEGIN_EXEC(&States::start);
-	expressions.eval();
-
-	if (expressions.args() <= 1) {
-		from = interface.ssm(SCI_GETCURRENTPOS);
-		sptr_t line = interface.ssm(SCI_LINEFROMPOSITION, from) +
-			      expressions.pop_num_calc();
-
-		if (!Validate::line(line))
-			throw RangeError("X");
-
-		len = interface.ssm(SCI_POSITIONFROMLINE, line) - from;
-
-		if (len < 0) {
-			from += len;
-			len *= -1;
-		}
-	} else {
-		tecoInt to = expressions.pop_num();
-		from = expressions.pop_num();
-
-		len = to - from;
-
-		if (len < 0 || !Validate::pos(from) || !Validate::pos(to))
-			throw RangeError("X");
-	}
-
-	tr.chrg.cpMin = from;
-	tr.chrg.cpMax = from + len;
-	tr.lpstrText = (char *)g_malloc(len + 1);
-	interface.ssm(SCI_GETTEXTRANGE, 0, (sptr_t)&tr);
-
-	if (eval_colon()) {
-		reg->undo_append_string();
-		reg->append_string(tr.lpstrText);
-	} else {
-		reg->undo_set_string();
-		reg->set_string(tr.lpstrText);
-	}
-	g_free(tr.lpstrText);
-
-	return &States::start;
-}
-
-} /* namespace SciTECO */