Function delimitedSelector

src/util/nodeSelectors.ts:238–302

(
  isDelimiterNode: (node: SyntaxNode) => boolean,
  defaultDelimiter: string,
  getStartNode: (node: SyntaxNode) => SyntaxNode = identity,
  getEndNode: (node: SyntaxNode) => SyntaxNode = identity
)

 * @returns A selection extractor
 */
export function delimitedSelector(
  isDelimiterNode: (node: SyntaxNode) => boolean,
  defaultDelimiter: string,
  getStartNode: (node: SyntaxNode) => SyntaxNode = identity,
  getEndNode: (node: SyntaxNode) => SyntaxNode = identity
): SelectionExtractor {
  return (editor: TextEditor, node: SyntaxNode) => {
    let containingListDelimiter: string | null = null;
    let leadingDelimiterRange: Range | null = null;
    let trailingDelimiterRange: Range | null = null;
    const startNode = getStartNode(node);
    const endNode = getEndNode(node);

    const nextNonDelimiterNode = getNextNonDelimiterNode(
      endNode,
      isDelimiterNode
    );
    const previousNonDelimiterNode = getPreviousNonDelimiterNode(
      startNode,
      isDelimiterNode
    );

    if (nextNonDelimiterNode != null) {
      trailingDelimiterRange = makeRangeFromPositions(
        endNode.endPosition,
        nextNonDelimiterNode.startPosition
      );

      containingListDelimiter = editor.document.getText(trailingDelimiterRange);
    }

    if (previousNonDelimiterNode != null) {
      leadingDelimiterRange = makeRangeFromPositions(
        previousNonDelimiterNode.endPosition,
        startNode.startPosition
      );

      if (containingListDelimiter == null) {
        containingListDelimiter = editor.document.getText(
          leadingDelimiterRange
        );
      }
    }

    if (containingListDelimiter == null) {
      containingListDelimiter = defaultDelimiter;
    }

    return {
      selection: new Selection(
        new Position(
          startNode.startPosition.row,
          startNode.startPosition.column
        ),
        new Position(endNode.endPosition.row, endNode.endPosition.column)
      ),
      context: {
        isInDelimitedList: true,