DevTools: Implement the console prompt with CodeMirror

third_party/WebKit/Source/devtools/front_end/console/ConsolePrompt.js

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * @constructor
+ * @extends {WebInspector.Widget}
+ */
+WebInspector.ConsolePrompt = function()
+{
+    WebInspector.Widget.call(this);
+    this._addCompletionsFromHistory = true;
+    this._history = new WebInspector.HistoryManager();
+
+    this._initialText = "";
+    this._editor = null;
+
+    this.element.tabIndex = 0;
+    this.element.addEventListener("keydown", this._editorKeyDown.bind(this), true);
+
+    self.runtime.extension(WebInspector.TextEditorFactory).instance().then(gotFactory.bind(this));
+
+    /**
+     * @param {!WebInspector.TextEditorFactory} factory
+     * @this {WebInspector.ConsolePrompt}
+     */
+    function gotFactory(factory)
+    {
+        this._editor = factory.createEditor({
+            lineNumbers: false,
+            lineWrapping: true,
+            mimeType: "javascript",
+            autoHeight: true
+        });
+
+        this._editor.configureAutocomplete({
+            substituteRangeCallback: this._substituteRange.bind(this),
+            suggestionsCallback: this._wordsWithPrefix.bind(this),
+            captureEnter: true
+        })
+        this._editor.widget().show(this.element);
+
+        this.setText(this._initialText);
+        delete this._initialText;
+        if (this.hasFocus())
+            this.focus();
+        this.element.tabIndex = -1;
+    }
+}
+
+WebInspector.ConsolePrompt.prototype = {
+    /**
+     * @return {!WebInspector.HistoryManager}
+     */
+    history: function()
+    {
+        return this._history;
+    },
+
+    clearAutocomplete: function()
+    {
+        if (this._editor)
+            this._editor.clearAutocomplete();
+    },
+
+    /**
+     * @return {boolean}
+     */
+    isCaretInsidePrompt: function()
+    {
+        return this.hasFocus();
+    },
+
+    /**
+     * @return {boolean}
+     */
+    isCaretAtEndOfPrompt: function()
+    {
+        return !!this._editor && this._editor.selection().collapseToEnd().equal(this._editor.fullRange().collapseToEnd());
+    },
+
+    /**
+     * @return {boolean}
+     */
+    isCaretOnLastLine: function()
+    {
+        return !!this._editor && this._editor.selection().endLine === this._editor.fullRange().endLine;
+    },
+
+    /**
+     * @return {boolean}
+     */
+    isCaretOnFirstLine: function()
+    {
+        return !!this._editor && this._editor.selection().endLine === 0;
+    },
+
+    moveCaretToEndOfPrompt: function()
+    {
+        if (this._editor)
+            this._editor.setSelection(WebInspector.TextRange.createFromLocation(Infinity,Infinity));
+    },
+
+    moveCaretToEndOfFirstLine: function()
+    {
+        if (this._editor)
+            this._editor.setSelection(WebInspector.TextRange.createFromLocation(0,Infinity));
+    },
+
+    /**
+     * @param {string} text
+     */
+    setText: function(text)
+    {
+        if (this._editor)
+            this._editor.setText(text);
+        else
+            this._initialText = text;
+    },
+
+    /**
+     * @return {string}
+     */
+    text: function()
+    {
+        return this._editor ? this._editor.text() : this._initialText;
+    },
+
+    /**
+     * @param {boolean} value
+     */
+    setAddCompletionsFromHistory: function(value)
+    {
+        this._addCompletionsFromHistory = value;
+    },
+
+    /**
+     * @param {!Event} event
+     */
+    _editorKeyDown: function(event)
+    {
+        var keyboardEvent = /** @type {!KeyboardEvent} */ (event);
+        var newText;
+        var isPrevious;
+
+        switch (keyboardEvent.keyCode) {
+        case WebInspector.KeyboardShortcut.Keys.Up.code:
+            if (!this.isCaretOnFirstLine())
+                break;
+            newText = this._history.previous(this.text());
+            isPrevious = true;
+            break;
+        case WebInspector.KeyboardShortcut.Keys.Down.code:
+            if (!this.isCaretOnLastLine())
+                break;
+            newText = this._history.next();
+            break;
+        case WebInspector.KeyboardShortcut.Keys.P.code: // Ctrl+P = Previous
+            if (WebInspector.isMac() && keyboardEvent.ctrlKey && !keyboardEvent.metaKey && !keyboardEvent.altKey && !keyboardEvent.shiftKey) {
+                newText = this._history.previous(this.text());
+                isPrevious = true;
+            }
+            break;
+        case WebInspector.KeyboardShortcut.Keys.N.code: // Ctrl+N = Next
+            if (WebInspector.isMac() && keyboardEvent.ctrlKey && !keyboardEvent.metaKey && !keyboardEvent.altKey && !keyboardEvent.shiftKey)
+                newText = this._history.next();
+            break;
+        }
+
+        if (newText === undefined)
+            return;
+        keyboardEvent.consume(true);
+        this.setText(newText);
+
+        if (isPrevious)
+            this.moveCaretToEndOfFirstLine();
+        else
+            this.moveCaretToEndOfPrompt();
+    },
+
+    /**
+     * @param {string} prefix
+     * @return {!WebInspector.SuggestBox.Suggestions}
+     */
+    _historyCompletions: function(prefix)
+    {
+        if (!this._addCompletionsFromHistory || !this.isCaretAtEndOfPrompt())
+            return [];
+        var result = [];
+        var text = this.text();
+        var set = new Set();
+        var data = this._history.historyData();
+        for (var i = data.length - 1; i >= 0 && result.length < 50; --i) {
+            var item = data[i];
+            if (!item.startsWith(text))
+                continue;
+            if (set.has(item))
+                continue;
+            set.add(item);
+            result.push({title: item.substring(text.length - prefix.length), className: "additional"});
+        }
+        return result;
+    },
+
+    /**
+     * @override
+     */
+    focus: function()
+    {
+        if (this._editor)
+            this._editor.widget().focus();
+        else
+            this.element.focus();
+    },
+
+    /**
+     * @param {number} lineNumber
+     * @param {number} columnNumber
+     * @return {?WebInspector.TextRange}
+     */
+    _substituteRange: function(lineNumber, columnNumber)
+    {
+        var lineText = this._editor.line(lineNumber);
+        var index;
+        for (index = lineText.length - 1; index >= 0; index--) {
+            if (" =:[({;,!+-*/&|^<>.".indexOf(lineText.charAt(index)) !== -1)
+                break;
+        }
+        return new WebInspector.TextRange(lineNumber, index + 1, lineNumber, columnNumber);
+    },
+
+    /**
+     * @param {!WebInspector.TextRange} prefixRange
+     * @param {!WebInspector.TextRange} substituteRange
+     * @return {!Promise.<!Array.<{title: string, className: (string|undefined)}>>}
+     */
+    _wordsWithPrefix: function(prefixRange, substituteRange)
+    {
+        var fulfill;
+        var promise = new Promise(x => fulfill = x);
+        var prefix = this._editor.text(prefixRange);
+        var before = this._editor.text(new WebInspector.TextRange(0, 0, prefixRange.startLine, prefixRange.startColumn));
+        var historyWords = this._historyCompletions(prefix);
+        WebInspector.ExecutionContextSelector.completionsForTextInCurrentContext(before, prefix, false /* Don't force */, innerWordsWithPrefix);
+        return promise;
+
+        /**
+         * @param {!Array.<string>} words
+         */
+        function innerWordsWithPrefix(words)
+        {
+            fulfill(words.map(item => ({title:item})).concat(historyWords));
+        }
+    },
+
+    __proto__: WebInspector.Widget.prototype
+}