Devtools: [WIP] Implement enhanced devtools extension language APIs

Source/devtools/front_end/source_frame/TextEditorAutocompleteController.js

Index: Source/devtools/front_end/source_frame/TextEditorAutocompleteController.js
diff --git a/Source/devtools/front_end/source_frame/TextEditorAutocompleteController.js b/Source/devtools/front_end/source_frame/TextEditorAutocompleteController.js
index fc755380a398e468462f08f26742386226b22807..3d7cae44e1c1255758d43cc5b0d61f5130c31542 100644
--- a/Source/devtools/front_end/source_frame/TextEditorAutocompleteController.js
+++ b/Source/devtools/front_end/source_frame/TextEditorAutocompleteController.js
@@ -126,6 +126,53 @@ WebInspector.TextEditorAutocompleteController.prototype = {
         var prefixRange = substituteRange.clone();
         prefixRange.endColumn = cursor.ch;
 
+        var oldPrefixRange = this._prefixRange;
+        this._prefixRange = prefixRange;
+
+        var prefix = this._textEditor.copyRange(prefixRange);
+
+        if (!oldPrefixRange || prefixRange.startLine !== oldPrefixRange.startLine || prefixRange.startColumn !== oldPrefixRange.startColumn)
+            this._updateAnchorBox();
+
+        var sourceUrl = this._textEditor.url();
+        if (sourceUrl) {
+            var mime = this._textEditor.mimeType();
+            var completionLocation = {
+                source: sourceUrl,
+                line: /** @type {number} */ (cursor.line),
+                column: /** @type {number} */ (cursor.ch)
+            };
+
+            if (WebInspector.languageService.handles.completions(mime)) {
+                var anchor = this._anchorBox; //This can be removed by other calls to _updateAnchorBox, keep it for us
+
+                /**
+                 * @this {!WebInspector.TextEditorAutocompleteController}
+                 */
+                function completionsReadyCallback(completions) {
+                    var texts = completions.map(function(i){ return i.text; });
+                    var details = completions.map(function(i){ return i.details; });
+                    if (!this._suggestBox)
+                        this._suggestBox = new WebInspector.SuggestBox(this, 6);
+
+                    this._suggestBox.updateSuggestions(anchor, texts, 0, true, prefix, details);
+                    if (!this._suggestBox.visible())
+                        this.finishAutocomplete();
+                    this._onSuggestionsShownForTest(texts);
+                }
+
+                var lastCompletion = this._lastCompletion = WebInspector.languageService.completions(mime, completionLocation, prefix).then((function(vals) {
+                    if (lastCompletion !== this._lastCompletion) return;
+                    if (!vals) {
+                        completionsReadyCallback.call(this, []);
+                        return;
+                    }
+                    completionsReadyCallback.call(this, vals);
+                }).bind(this));
+                return;
+            }
+        }
+
         var wordsWithPrefix = this._delegate.wordsWithPrefix(this._textEditor, prefixRange, substituteRange);
         if (!wordsWithPrefix.length) {
             this.finishAutocomplete();
@@ -134,11 +181,7 @@ WebInspector.TextEditorAutocompleteController.prototype = {
 
         if (!this._suggestBox)
             this._suggestBox = new WebInspector.SuggestBox(this, 6);
-        var oldPrefixRange = this._prefixRange;
-        this._prefixRange = prefixRange;
-        if (!oldPrefixRange || prefixRange.startLine !== oldPrefixRange.startLine || prefixRange.startColumn !== oldPrefixRange.startColumn)
-            this._updateAnchorBox();
-        this._suggestBox.updateSuggestions(this._anchorBox, wordsWithPrefix, 0, true, this._textEditor.copyRange(prefixRange));
+        this._suggestBox.updateSuggestions(this._anchorBox, wordsWithPrefix, 0, true, prefix);
         if (!this._suggestBox.visible())
             this.finishAutocomplete();
         this._onSuggestionsShownForTest(wordsWithPrefix);
@@ -194,6 +237,9 @@ WebInspector.TextEditorAutocompleteController.prototype = {
      */
     acceptSuggestion: function()
     {
+        if (!this._prefixRange)
+            return;
+
         if (this._prefixRange.endColumn - this._prefixRange.startColumn === this._currentSuggestion.length)
             return;
 
@@ -224,7 +270,7 @@ WebInspector.TextEditorAutocompleteController.prototype = {
 
     _onCursorActivity: function()
     {
-        if (!this._suggestBox)
+        if (!(this._suggestBox && this._prefixRange))
             return;
         var cursor = this._codeMirror.getCursor();
         if (cursor.line !== this._prefixRange.startLine || cursor.ch > this._prefixRange.endColumn || cursor.ch <= this._prefixRange.startColumn)
@@ -233,6 +279,7 @@ WebInspector.TextEditorAutocompleteController.prototype = {
 
     _updateAnchorBox: function()
     {
+        if (!this._prefixRange) return;
         var line = this._prefixRange.startLine;
         var column = this._prefixRange.startColumn;
         var metrics = this._textEditor.cursorPositionToCoordinates(line, column);