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/*
* Copyright (C) 2015 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
WI.CodeMirrorTextKillController = class CodeMirrorTextKillController extends WI.Object
{
constructor(codeMirror)
{
super();
console.assert(codeMirror);
this._codeMirror = codeMirror;
this._expectingChangeEventForKill = false;
this._nextKillStartsNewSequence = true;
this._shouldPrependToKillRing = false;
this._handleTextChangeListener = this._handleTextChange.bind(this);
this._handleEditorBlurListener = this._handleEditorBlur.bind(this);
this._handleSelectionOrCaretChangeListener = this._handleSelectionOrCaretChange.bind(this);
// FIXME: these keybindings match CodeMirror's default keymap for OS X.
// They should probably be altered for Windows / Linux someday.
this._codeMirror.addKeyMap({
// Overrides for the 'emacsy' keymap.
"Ctrl-K": this._handleTextKillCommand.bind(this, "killLine", false),
"Alt-D": this._handleTextKillCommand.bind(this, "delWordAfter", false),
// Overrides for the 'macDefault' keymap.
"Alt-Delete": this._handleTextKillCommand.bind(this, "delGroupAfter", false),
"Cmd-Backspace": this._handleTextKillCommand.bind(this, "delWrappedLineLeft", true),
"Cmd-Delete": this._handleTextKillCommand.bind(this, "delWrappedLineRight", false),
"Alt-Backspace": this._handleTextKillCommand.bind(this, "delGroupBefore", true),
"Ctrl-Alt-Backspace": this._handleTextKillCommand.bind(this, "delGroupAfter", false),
});
}
_handleTextKillCommand(command, prependsToKillRing, codeMirror)
{
// Read-only mode is dynamic in some editors, so check every time
// and ignore the shortcut if in read-only mode.
if (this._codeMirror.getOption("readOnly"))
return;
this._shouldPrependToKillRing = prependsToKillRing;
// Don't add the listener if it's still registered because
// a previous empty kill didn't generate change events.
if (!this._expectingChangeEventForKill)
this._codeMirror.on("changes", this._handleTextChangeListener);
this._expectingChangeEventForKill = true;
this._codeMirror.execCommand(command);
}
_handleTextChange(codeMirror, changes)
{
this._codeMirror.off("changes", this._handleTextChangeListener);
// Sometimes a second change event fires after removing the listener
// if you perform an "empty kill" and type after moving the caret.
if (!this._expectingChangeEventForKill)
return;
this._expectingChangeEventForKill = false;
// It doesn't make sense to get more than one change per kill.
console.assert(changes.length === 1);
let change = changes[0];
// If an "empty kill" is followed by up/down or typing,
// the empty kill won't fire a change event, then we'll get an
// unrelated change event that shouldn't be treated as a kill.
if (change.origin !== "+delete")
return;
// When killed text includes a newline, CodeMirror returns
// strange change objects. Special-case for when this could happen.
let killedText;
if (change.to.line === change.from.line + 1 && change.removed.length === 2) {
// An entire line was deleted, including newline (deleteLine).
if (change.removed[0].length && !change.removed[1].length)
killedText = change.removed[0] + "\n";
// A newline was killed by itself (Ctrl-K).
else
killedText = "\n";
} else {
console.assert(change.removed.length === 1);
killedText = change.removed[0];
}
InspectorFrontendHost.killText(killedText, this._shouldPrependToKillRing, this._nextKillStartsNewSequence);
// If the editor loses focus or the caret / selection changes
// (not as a result of the kill), then the next kill should
// start a new kill ring sequence.
this._nextKillStartsNewSequence = false;
this._codeMirror.on("blur", this._handleEditorBlurListener);
this._codeMirror.on("cursorActivity", this._handleSelectionOrCaretChangeListener);
}
_handleEditorBlur(codeMirror)
{
this._nextKillStartsNewSequence = true;
this._codeMirror.off("blur", this._handleEditorBlurListener);
this._codeMirror.off("cursorActivity", this._handleSelectionOrCaretChangeListener);
}
_handleSelectionOrCaretChange(codeMirror)
{
if (this._expectingChangeEventForKill)
return;
this._nextKillStartsNewSequence = true;
this._codeMirror.off("blur", this._handleEditorBlurListener);
this._codeMirror.off("cursorActivity", this._handleSelectionOrCaretChangeListener);
}
};
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