smartIndenter: Don't indent after control-flow ending statements like break;
(#20016)
* smartIndenter: Don't indent after control-flow ending statements like `break;` * Fix bug * Fix bug for function after `return`
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09d0a671ee
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3 changed files with 100 additions and 70 deletions
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@ -36,24 +36,7 @@ namespace ts.formatting {
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const enclosingCommentRange = getRangeOfEnclosingComment(sourceFile, position, /*onlyMultiLine*/ true, precedingToken || null); // tslint:disable-line:no-null-keyword
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if (enclosingCommentRange) {
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const previousLine = getLineAndCharacterOfPosition(sourceFile, position).line - 1;
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const commentStartLine = getLineAndCharacterOfPosition(sourceFile, enclosingCommentRange.pos).line;
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Debug.assert(commentStartLine >= 0);
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if (previousLine <= commentStartLine) {
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return findFirstNonWhitespaceColumn(getStartPositionOfLine(commentStartLine, sourceFile), position, sourceFile, options);
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}
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const startPostionOfLine = getStartPositionOfLine(previousLine, sourceFile);
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const { column, character } = findFirstNonWhitespaceCharacterAndColumn(startPostionOfLine, position, sourceFile, options);
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if (column === 0) {
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return column;
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}
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const firstNonWhitespaceCharacterCode = sourceFile.text.charCodeAt(startPostionOfLine + character);
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return firstNonWhitespaceCharacterCode === CharacterCodes.asterisk ? column - 1 : column;
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return getCommentIndent(sourceFile, position, options, enclosingCommentRange);
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}
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if (!precedingToken) {
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@ -72,20 +55,7 @@ namespace ts.formatting {
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// for block indentation, we should look for a line which contains something that's not
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// whitespace.
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if (options.indentStyle === IndentStyle.Block) {
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// move backwards until we find a line with a non-whitespace character,
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// then find the first non-whitespace character for that line.
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let current = position;
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while (current > 0) {
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const char = sourceFile.text.charCodeAt(current);
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if (!isWhiteSpaceLike(char)) {
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break;
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}
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current--;
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}
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const lineStart = ts.getLineStartPositionForPosition(current, sourceFile);
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return SmartIndenter.findFirstNonWhitespaceColumn(lineStart, current, sourceFile, options);
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return getBlockIndent(sourceFile, position, options);
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}
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if (precedingToken.kind === SyntaxKind.CommaToken && precedingToken.parent.kind !== SyntaxKind.BinaryExpression) {
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@ -96,26 +66,60 @@ namespace ts.formatting {
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}
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}
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return getSmartIndent(sourceFile, position, precedingToken, lineAtPosition, assumeNewLineBeforeCloseBrace, options);
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}
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function getCommentIndent(sourceFile: SourceFile, position: number, options: EditorSettings, enclosingCommentRange: CommentRange): number {
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const previousLine = getLineAndCharacterOfPosition(sourceFile, position).line - 1;
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const commentStartLine = getLineAndCharacterOfPosition(sourceFile, enclosingCommentRange.pos).line;
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Debug.assert(commentStartLine >= 0);
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if (previousLine <= commentStartLine) {
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return findFirstNonWhitespaceColumn(getStartPositionOfLine(commentStartLine, sourceFile), position, sourceFile, options);
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}
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const startPostionOfLine = getStartPositionOfLine(previousLine, sourceFile);
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const { column, character } = findFirstNonWhitespaceCharacterAndColumn(startPostionOfLine, position, sourceFile, options);
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if (column === 0) {
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return column;
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}
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const firstNonWhitespaceCharacterCode = sourceFile.text.charCodeAt(startPostionOfLine + character);
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return firstNonWhitespaceCharacterCode === CharacterCodes.asterisk ? column - 1 : column;
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}
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function getBlockIndent(sourceFile: SourceFile, position: number, options: EditorSettings): number {
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// move backwards until we find a line with a non-whitespace character,
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// then find the first non-whitespace character for that line.
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let current = position;
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while (current > 0) {
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const char = sourceFile.text.charCodeAt(current);
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if (!isWhiteSpaceLike(char)) {
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break;
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}
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current--;
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}
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const lineStart = ts.getLineStartPositionForPosition(current, sourceFile);
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return findFirstNonWhitespaceColumn(lineStart, current, sourceFile, options);
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}
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function getSmartIndent(sourceFile: SourceFile, position: number, precedingToken: Node, lineAtPosition: number, assumeNewLineBeforeCloseBrace: boolean, options: EditorSettings): number {
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// try to find node that can contribute to indentation and includes 'position' starting from 'precedingToken'
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// if such node is found - compute initial indentation for 'position' inside this node
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let previous: Node;
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let previous: Node | undefined;
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let current = precedingToken;
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let currentStart: LineAndCharacter;
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let indentationDelta: number;
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while (current) {
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if (positionBelongsToNode(current, position, sourceFile) && shouldIndentChildNode(current, previous)) {
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currentStart = getStartLineAndCharacterForNode(current, sourceFile);
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if (positionBelongsToNode(current, position, sourceFile) && shouldIndentChildNode(current, previous, /*isNextChild*/ true)) {
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const currentStart = getStartLineAndCharacterForNode(current, sourceFile);
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const nextTokenKind = nextTokenIsCurlyBraceOnSameLineAsCursor(precedingToken, current, lineAtPosition, sourceFile);
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if (nextTokenKind !== NextTokenKind.Unknown) {
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const indentationDelta = nextTokenKind !== NextTokenKind.Unknown
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// handle cases when codefix is about to be inserted before the close brace
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indentationDelta = assumeNewLineBeforeCloseBrace && nextTokenKind === NextTokenKind.CloseBrace ? options.indentSize : 0;
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}
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else {
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indentationDelta = lineAtPosition !== currentStart.line ? options.indentSize : 0;
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}
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break;
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? assumeNewLineBeforeCloseBrace && nextTokenKind === NextTokenKind.CloseBrace ? options.indentSize : 0
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: lineAtPosition !== currentStart.line ? options.indentSize : 0;
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return getIndentationForNodeWorker(current, currentStart, /*ignoreActualIndentationRange*/ undefined, indentationDelta, sourceFile, /*isNextChild*/ true, options);
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}
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// check if current node is a list item - if yes, take indentation from it
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@ -131,18 +135,13 @@ namespace ts.formatting {
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previous = current;
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current = current.parent;
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}
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if (!current) {
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// no parent was found - return the base indentation of the SourceFile
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return getBaseIndentation(options);
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}
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return getIndentationForNodeWorker(current, currentStart, /*ignoreActualIndentationRange*/ undefined, indentationDelta, sourceFile, options);
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// no parent was found - return the base indentation of the SourceFile
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return getBaseIndentation(options);
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}
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export function getIndentationForNode(n: Node, ignoreActualIndentationRange: TextRange, sourceFile: SourceFile, options: EditorSettings): number {
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const start = sourceFile.getLineAndCharacterOfPosition(n.getStart(sourceFile));
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return getIndentationForNodeWorker(n, start, ignoreActualIndentationRange, /*indentationDelta*/ 0, sourceFile, options);
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return getIndentationForNodeWorker(n, start, ignoreActualIndentationRange, /*indentationDelta*/ 0, sourceFile, /*isNextChild*/ false, options);
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}
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export function getBaseIndentation(options: EditorSettings) {
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@ -155,11 +154,9 @@ namespace ts.formatting {
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ignoreActualIndentationRange: TextRange,
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indentationDelta: number,
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sourceFile: SourceFile,
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isNextChild: boolean,
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options: EditorSettings): number {
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let parent: Node = current.parent;
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let containingListOrParentStart: LineAndCharacter;
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let parent = current.parent!;
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// Walk up the tree and collect indentation for parent-child node pairs. Indentation is not added if
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// * parent and child nodes start on the same line, or
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// * parent is an IfStatement and child starts on the same line as an 'else clause'.
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@ -178,7 +175,7 @@ namespace ts.formatting {
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}
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}
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containingListOrParentStart = getContainingListOrParentStart(parent, current, sourceFile);
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const containingListOrParentStart = getContainingListOrParentStart(parent, current, sourceFile);
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const parentAndChildShareLine =
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containingListOrParentStart.line === currentStart.line ||
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childStartsOnTheSameLineWithElseInIfStatement(parent, current, currentStart.line, sourceFile);
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@ -196,7 +193,7 @@ namespace ts.formatting {
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}
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// increase indentation if parent node wants its content to be indented and parent and child nodes don't start on the same line
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if (shouldIndentChildNode(parent, current) && !parentAndChildShareLine) {
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if (shouldIndentChildNode(parent, current, isNextChild) && !parentAndChildShareLine) {
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indentationDelta += options.indentSize;
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}
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@ -214,7 +211,7 @@ namespace ts.formatting {
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current = parent;
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parent = current.parent;
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currentStart = useTrueStart ? sourceFile.getLineAndCharacterOfPosition(current.getStart()) : containingListOrParentStart;
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currentStart = useTrueStart ? sourceFile.getLineAndCharacterOfPosition(current.getStart(sourceFile)) : containingListOrParentStart;
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}
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return indentationDelta + getBaseIndentation(options);
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@ -533,8 +530,7 @@ namespace ts.formatting {
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return false;
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}
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/* @internal */
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export function nodeWillIndentChild(parent: TextRangeWithKind, child: TextRangeWithKind, indentByDefault: boolean) {
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export function nodeWillIndentChild(parent: TextRangeWithKind, child: TextRangeWithKind | undefined, indentByDefault: boolean): boolean {
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const childKind = child ? child.kind : SyntaxKind.Unknown;
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switch (parent.kind) {
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case SyntaxKind.DoStatement:
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@ -555,7 +551,7 @@ namespace ts.formatting {
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return childKind !== SyntaxKind.NamedExports;
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case SyntaxKind.ImportDeclaration:
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return childKind !== SyntaxKind.ImportClause ||
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((<ImportClause>child).namedBindings && (<ImportClause>child).namedBindings.kind !== SyntaxKind.NamedImports);
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(!!(<ImportClause>child).namedBindings && (<ImportClause>child).namedBindings.kind !== SyntaxKind.NamedImports);
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case SyntaxKind.JsxElement:
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return childKind !== SyntaxKind.JsxClosingElement;
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}
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@ -563,11 +559,44 @@ namespace ts.formatting {
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return indentByDefault;
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}
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/*
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Function returns true when the parent node should indent the given child by an explicit rule
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*/
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export function shouldIndentChildNode(parent: TextRangeWithKind, child?: TextRangeWithKind): boolean {
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return nodeContentIsAlwaysIndented(parent.kind) || nodeWillIndentChild(parent, child, /*indentByDefault*/ false);
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function isControlFlowEndingStatement(kind: SyntaxKind, parent: TextRangeWithKind): boolean {
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switch (kind) {
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case SyntaxKind.ReturnStatement:
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case SyntaxKind.ThrowStatement:
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switch (parent.kind) {
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case SyntaxKind.Block:
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const grandParent = (parent as Node).parent;
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switch (grandParent && grandParent.kind) {
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case SyntaxKind.FunctionDeclaration:
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case SyntaxKind.FunctionExpression:
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// We may want to write inner functions after this.
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return false;
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default:
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return true;
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}
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case SyntaxKind.CaseClause:
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case SyntaxKind.DefaultClause:
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case SyntaxKind.SourceFile:
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case SyntaxKind.ModuleBlock:
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return true;
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default:
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throw Debug.fail();
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}
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case SyntaxKind.ContinueStatement:
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case SyntaxKind.BreakStatement:
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return true;
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default:
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return false;
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}
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}
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/**
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* True when the parent node should indent the given child by an explicit rule.
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* @param isNextChild If true, we are judging indent of a hypothetical child *after* this one, not the current child.
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*/
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export function shouldIndentChildNode(parent: TextRangeWithKind, child?: TextRangeWithKind, isNextChild = false): boolean {
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return (nodeContentIsAlwaysIndented(parent.kind) || nodeWillIndentChild(parent, child, /*indentByDefault*/ false))
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&& !(isNextChild && child && isControlFlowEndingStatement(child.kind, parent));
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}
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}
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}
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@ -441,6 +441,7 @@ namespace ts {
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* Assumes `candidate.start <= position` holds.
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*/
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export function positionBelongsToNode(candidate: Node, position: number, sourceFile: SourceFile): boolean {
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Debug.assert(candidate.pos <= position);
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return position < candidate.end || !isCompletedNode(candidate, sourceFile);
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}
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@ -11,7 +11,7 @@
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//// case 1:
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//// {| "indentation": 12 |}
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//// break;
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//// {| "indentation": 12 |} // content of case clauses is always indented relatively to case clause
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//// {| "indentation": 8 |} // since we just saw "break"
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//// }
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//// {| "indentation": 4 |}
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////}
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