multi-line comment formatting fix and handler

src/compiler/utilities.ts

@@ -647,7 +647,7 @@ namespace ts {
     }
 
     export function getLeadingCommentRangesOfNode(node: Node, sourceFileOfNode: SourceFile) {
-        return getLeadingCommentRanges(sourceFileOfNode.text, node.pos);
+        return node.kind !== SyntaxKind.JsxText ? getLeadingCommentRanges(sourceFileOfNode.text, node.pos) : undefined;
     }
 
     export function getJSDocCommentRanges(node: Node, text: string) {

src/harness/fourslash.ts

@@ -2508,6 +2508,23 @@ namespace FourSlash {
             }
         }
 
+        public verifySpanOfEnclosingComment(negative: boolean, onlyMultiLineDiverges?: boolean) {
+            const expected = !negative;
+            const position = this.currentCaretPosition;
+            const fileName = this.activeFile.fileName;
+            const actual = !!this.languageService.getSpanOfEnclosingComment(fileName, position, /*onlyMultiLine*/ false);
+            const actualOnlyMultiLine = !!this.languageService.getSpanOfEnclosingComment(fileName, position, /*onlyMultiLine*/ true);
+            if (expected !== actual || onlyMultiLineDiverges === (actual === actualOnlyMultiLine)) {
+                this.raiseError(`verifySpanOfEnclosingComment failed:
+                position: '${position}'
+                fileName: '${fileName}'
+                onlyMultiLineDiverges: '${onlyMultiLineDiverges}'
+                actual: '${actual}'
+                actualOnlyMultiLine: '${actualOnlyMultiLine}'
+                expected: '${expected}'.`);
+            }
+        }
+
         /*
             Check number of navigationItems which match both searchValue and matchKind,
             if a filename is passed in, limit the results to that file.
@@ -3648,6 +3665,10 @@ namespace FourSlashInterface {
             this.state.verifyBraceCompletionAtPosition(this.negative, openingBrace);
         }
 
+        public isInCommentAtPosition(onlyMultiLineDiverges?: boolean) {
+            this.state.verifySpanOfEnclosingComment(this.negative, onlyMultiLineDiverges);
+        }
+
         public codeFixAvailable() {
             this.state.verifyCodeFixAvailable(this.negative);
         }

src/harness/harnessLanguageService.ts

@@ -487,6 +487,9 @@ namespace Harness.LanguageService {
         isValidBraceCompletionAtPosition(fileName: string, position: number, openingBrace: number): boolean {
             return unwrapJSONCallResult(this.shim.isValidBraceCompletionAtPosition(fileName, position, openingBrace));
         }
+        getSpanOfEnclosingComment(fileName: string, position: number, onlyMultiLine: boolean): ts.TextSpan {
+            return unwrapJSONCallResult(this.shim.getSpanOfEnclosingComment(fileName, position, onlyMultiLine));
+        }
         getCodeFixesAtPosition(): ts.CodeAction[] {
             throw new Error("Not supported on the shim.");
         }

src/server/client.ts

@@ -527,6 +527,10 @@ namespace ts.server {
             return notImplemented();
         }
 
+        getSpanOfEnclosingComment(_fileName: string, _position: number, _onlyMultiLine: boolean): TextSpan {
+            return notImplemented();
+        }
+
         getCodeFixesAtPosition(file: string, start: number, end: number, errorCodes: number[]): CodeAction[] {
             const args: protocol.CodeFixRequestArgs = { ...this.createFileRangeRequestArgs(file, start, end), errorCodes };
 

src/server/protocol.ts

@@ -8,6 +8,7 @@ namespace ts.server.protocol {
         /* @internal */
         BraceFull = "brace-full",
         BraceCompletion = "braceCompletion",
+        GetSpanOfEnclosingComment = "getSpanOfEnclosingComment",
         Change = "change",
         Close = "close",
         Completions = "completions",
@@ -241,6 +242,21 @@ namespace ts.server.protocol {
         body?: TodoComment[];
     }
 
+    /**
+     * A request to determine if the caret is inside a comment.
+     */
+    export interface SpanOfEnclosingCommentRequest extends FileLocationRequest {
+        command: CommandTypes.GetSpanOfEnclosingComment;
+        arguments: SpanOfEnclosingCommentRequestArgs;
+    }
+
+    export interface SpanOfEnclosingCommentRequestArgs extends FileLocationRequestArgs {
+        /**
+         * Requires that the enclosing span be a multi-line comment, or else the request returns undefined.
+         */
+        onlyMultiLine: boolean;
+    }
+
     /**
      * Request to obtain outlining spans in file.
      */

src/server/session.ts

@@ -1025,6 +1025,14 @@ namespace ts.server {
             return project.getLanguageService(/*ensureSynchronized*/ false).getDocCommentTemplateAtPosition(file, position);
         }
 
+        private getSpanOfEnclosingComment(args: protocol.SpanOfEnclosingCommentRequestArgs) {
+            const { file, project } = this.getFileAndProjectWithoutRefreshingInferredProjects(args);
+            const scriptInfo = project.getScriptInfoForNormalizedPath(file);
+            const onlyMultiLine = args.onlyMultiLine;
+            const position = this.getPosition(args, scriptInfo);
+            return project.getLanguageService(/*ensureSynchronized*/ false).getSpanOfEnclosingComment(file, position, onlyMultiLine);
+        }
+
         private getIndentation(args: protocol.IndentationRequestArgs) {
             const { file, project } = this.getFileAndProjectWithoutRefreshingInferredProjects(args);
             const position = this.getPosition(args, project.getScriptInfoForNormalizedPath(file));
@@ -1765,6 +1773,9 @@ namespace ts.server {
             [CommandNames.DocCommentTemplate]: (request: protocol.DocCommentTemplateRequest) => {
                 return this.requiredResponse(this.getDocCommentTemplate(request.arguments));
             },
+            [CommandNames.GetSpanOfEnclosingComment]: (request: protocol.SpanOfEnclosingCommentRequest) => {
+                return this.requiredResponse(this.getSpanOfEnclosingComment(request.arguments));
+            },
             [CommandNames.Format]: (request: protocol.FormatRequest) => {
                 return this.requiredResponse(this.getFormattingEditsForRange(request.arguments));
             },

src/services/formatting/formatting.ts

@@ -1152,6 +1152,53 @@ namespace ts.formatting {
         }
     }
 
+    /**
+     * @param precedingToken pass `null` if preceding token was already computed and result was `undefined`.
+     */
+    export function getRangeOfEnclosingComment(
+        sourceFile: SourceFile,
+        position: number,
+        onlyMultiLine: boolean,
+        precedingToken: Node | null | undefined = findPrecedingToken(position, sourceFile), // tslint:disable-line:no-null-keyword
+        tokenAtPosition = getTokenAtPosition(sourceFile, position, /*includeJsDocComment*/ false),
+        predicate?: (c: CommentRange) => boolean): CommentRange | undefined {
+        // Considering a fixed position,
+        // - trailing comments are those following and on the same line as the position.
+        // - leading comments are those in the range [position, start of next non-trivia token)
+        // that are not trailing comments of that position.
+        //
+        // Note, `node.start` is the start-position of the first comment following the previous
+        // token that is not a trailing comment, so the leading and trailing comments of all
+        // tokens contain all comments in a sourcefile disjointly.
+        const trailingRangesOfPreviousToken = precedingToken && getTrailingCommentRanges(sourceFile.text, precedingToken.end);
+        const leadingCommentRangesOfNextToken = getLeadingCommentRangesOfNode(tokenAtPosition, sourceFile);
+        const commentRanges = trailingRangesOfPreviousToken && leadingCommentRangesOfNextToken ?
+            trailingRangesOfPreviousToken.concat(leadingCommentRangesOfNextToken) :
+            trailingRangesOfPreviousToken || leadingCommentRangesOfNextToken;
+        if (commentRanges) {
+            for (const range of commentRanges) {
+                // The end marker of a single-line comment does not include the newline character.
+                // With caret at `^`, in the following case, we are inside a comment (^ denotes the cursor position):
+                //
+                //    // asdf   ^\n
+                //
+                // But for closed multi-line comments, we don't want to be inside the comment in the following case:
+                //
+                //    /* asdf */^
+                //
+                // However, unterminated multi-line comments *do* contain their end.
+                //
+                // Internally, we represent the end of the comment at the newline and closing '/', respectively.
+                //
+                if ((range.pos < position && position < range.end ||
+                    position === range.end && (range.kind === SyntaxKind.SingleLineCommentTrivia || position === sourceFile.getFullWidth()))) {
+                    return (range.kind === SyntaxKind.MultiLineCommentTrivia || !onlyMultiLine) && (!predicate || predicate(range)) ? range : undefined;
+                }
+            }
+        }
+        return undefined;
+    }
+
     function getOpenTokenForList(node: Node, list: ReadonlyArray<Node>) {
         switch (node.kind) {
             case SyntaxKind.Constructor:

src/services/formatting/smartIndenter.ts

@@ -32,13 +32,36 @@ namespace ts.formatting {
             }
 
             const precedingToken = findPrecedingToken(position, sourceFile);
+
+            const enclosingCommentRange = getRangeOfEnclosingComment(sourceFile, position, /*onlyMultiLine*/ true, precedingToken || null); // tslint:disable-line:no-null-keyword
+            if (enclosingCommentRange) {
+                const previousLine = getLineAndCharacterOfPosition(sourceFile, position).line - 1;
+                const commentStartLine = getLineAndCharacterOfPosition(sourceFile, enclosingCommentRange.pos).line;
+
+                Debug.assert(commentStartLine >= 0);
+
+                if (previousLine <= commentStartLine) {
+                    return findFirstNonWhitespaceColumn(getStartPositionOfLine(commentStartLine, sourceFile), position, sourceFile, options);
+                }
+
+                const startPostionOfLine = getStartPositionOfLine(previousLine, sourceFile);
+                const { column, character } = findFirstNonWhitespaceCharacterAndColumn(startPostionOfLine, position, sourceFile, options);
+
+                if (column === 0) {
+                    return column;
+                }
+
+                const firstNonWhitespaceCharacterCode = sourceFile.text.charCodeAt(startPostionOfLine + character);
+                return firstNonWhitespaceCharacterCode === CharacterCodes.asterisk ? column - 1 : column;
+            }
+
             if (!precedingToken) {
                 return getBaseIndentation(options);
             }
 
             // no indentation in string \regex\template literals
             const precedingTokenIsLiteral = isStringOrRegularExpressionOrTemplateLiteral(precedingToken.kind);
-            if (precedingTokenIsLiteral && precedingToken.getStart(sourceFile) <= position && precedingToken.end > position) {
+            if (precedingTokenIsLiteral && precedingToken.getStart(sourceFile) <= position && position < precedingToken.end) {
                 return 0;
             }
 
@@ -405,13 +428,13 @@ namespace ts.formatting {
             return findFirstNonWhitespaceColumn(lineStart, lineStart + lineAndCharacter.character, sourceFile, options);
         }
 
-        /*
-            Character is the actual index of the character since the beginning of the line.
-            Column - position of the character after expanding tabs to spaces
-            "0\t2$"
-            value of 'character' for '$' is 3
-            value of 'column' for '$' is 6 (assuming that tab size is 4)
-        */
+        /**
+         * Character is the actual index of the character since the beginning of the line.
+         * Column - position of the character after expanding tabs to spaces.
+         * "0\t2$"
+         * value of 'character' for '$' is 3
+         * value of 'column' for '$' is 6 (assuming that tab size is 4)
+         */
         export function findFirstNonWhitespaceCharacterAndColumn(startPos: number, endPos: number, sourceFile: SourceFileLike, options: EditorSettings) {
             let character = 0;
             let column = 0;

src/services/services.ts

@@ -107,12 +107,14 @@ namespace ts {
             scanner.setTextPos(pos);
             while (pos < end) {
                 const token = scanner.scan();
-                Debug.assert(token !== SyntaxKind.EndOfFileToken); // Else it would infinitely loop
                 const textPos = scanner.getTextPos();
                 if (textPos <= end) {
                     nodes.push(createNode(token, pos, textPos, this));
                 }
                 pos = textPos;
+                if (token === SyntaxKind.EndOfFileToken) {
+                    break;
+                }
             }
             return pos;
         }
@@ -1757,17 +1759,20 @@ namespace ts {
         function getFormattingEditsAfterKeystroke(fileName: string, position: number, key: string, options: FormatCodeOptions | FormatCodeSettings): TextChange[] {
             const sourceFile = syntaxTreeCache.getCurrentSourceFile(fileName);
             const settings = toEditorSettings(options);
-            if (key === "{") {
-                return formatting.formatOnOpeningCurly(position, sourceFile, getRuleProvider(settings), settings);
-            }
-            else if (key === "}") {
-                return formatting.formatOnClosingCurly(position, sourceFile, getRuleProvider(settings), settings);
-            }
-            else if (key === ";") {
-                return formatting.formatOnSemicolon(position, sourceFile, getRuleProvider(settings), settings);
-            }
-            else if (key === "\n") {
-                return formatting.formatOnEnter(position, sourceFile, getRuleProvider(settings), settings);
+
+            if (!isInComment(sourceFile, position)) {
+                if (key === "{") {
+                    return formatting.formatOnOpeningCurly(position, sourceFile, getRuleProvider(settings), settings);
+                }
+                else if (key === "}") {
+                    return formatting.formatOnClosingCurly(position, sourceFile, getRuleProvider(settings), settings);
+                }
+                else if (key === ";") {
+                    return formatting.formatOnSemicolon(position, sourceFile, getRuleProvider(settings), settings);
+                }
+                else if (key === "\n") {
+                    return formatting.formatOnEnter(position, sourceFile, getRuleProvider(settings), settings);
+                }
             }
 
             return [];
@@ -1826,6 +1831,12 @@ namespace ts {
             return true;
         }
 
+        function getSpanOfEnclosingComment(fileName: string, position: number, onlyMultiLine: boolean) {
+            const sourceFile = syntaxTreeCache.getCurrentSourceFile(fileName);
+            const range = ts.formatting.getRangeOfEnclosingComment(sourceFile, position, onlyMultiLine);
+            return range && createTextSpanFromRange(range);
+        }
+
         function getTodoComments(fileName: string, descriptors: TodoCommentDescriptor[]): TodoComment[] {
             // Note: while getting todo comments seems like a syntactic operation, we actually
             // treat it as a semantic operation here.  This is because we expect our host to call
@@ -2050,6 +2061,7 @@ namespace ts {
             getFormattingEditsAfterKeystroke,
             getDocCommentTemplateAtPosition,
             isValidBraceCompletionAtPosition,
+            getSpanOfEnclosingComment,
             getCodeFixesAtPosition,
             getEmitOutput,
             getNonBoundSourceFile,

src/services/shims.ts

@@ -254,6 +254,11 @@ namespace ts {
          */
         isValidBraceCompletionAtPosition(fileName: string, position: number, openingBrace: number): string;
 
+        /**
+         * Returns a JSON-encoded TextSpan | undefined indicating the range of the enclosing comment, if it exists.
+         */
+        getSpanOfEnclosingComment(fileName: string, position: number, onlyMultiLine: boolean): string;
+
         getEmitOutput(fileName: string): string;
         getEmitOutputObject(fileName: string): EmitOutput;
     }
@@ -815,6 +820,13 @@ namespace ts {
             );
         }
 
+        public getSpanOfEnclosingComment(fileName: string, position: number, onlyMultiLine: boolean): string {
+            return this.forwardJSONCall(
+                `getSpanOfEnclosingComment('${fileName}', ${position})`,
+                () => this.languageService.getSpanOfEnclosingComment(fileName, position, onlyMultiLine)
+            );
+        }
+
         /// GET SMART INDENT
         public getIndentationAtPosition(fileName: string, position: number, options: string /*Services.EditorOptions*/): string {
             return this.forwardJSONCall(

src/services/types.ts

@@ -270,6 +270,8 @@ namespace ts {
 
         isValidBraceCompletionAtPosition(fileName: string, position: number, openingBrace: number): boolean;
 
+        getSpanOfEnclosingComment(fileName: string, position: number, onlyMultiLine: boolean): TextSpan;
+
         getCodeFixesAtPosition(fileName: string, start: number, end: number, errorCodes: number[], formatOptions: FormatCodeSettings): CodeAction[];
         getApplicableRefactors(fileName: string, positionOrRaneg: number | TextRange): ApplicableRefactorInfo[];
         getEditsForRefactor(fileName: string, formatOptions: FormatCodeSettings, positionOrRange: number | TextRange, refactorName: string, actionName: string): RefactorEditInfo | undefined;