Function searchNodeAscending

src/util/nodeFinders.ts:191–216

(
  node: SyntaxNode,
  lastPattern: Pattern,
  patterns: Pattern[]
)

type NodePattern = [SyntaxNode, Pattern] | null;

function searchNodeAscending(
  node: SyntaxNode,
  lastPattern: Pattern,
  patterns: Pattern[]
): NodePattern {
  let resultNode = node;
  let resultPattern = lastPattern;
  let important: NodePattern = lastPattern.isImportant
    ? [node, lastPattern]
    : null;
  for (let i = patterns.length - 2; i > -1; --i) {
    const pattern = patterns[i];
    if (resultNode.parent == null || !pattern.typeEquals(resultNode.parent)) {
      if (pattern.isOptional) {
        continue;
      }
      return null;
    }
    resultNode = resultNode.parent;
    resultPattern = pattern;
    if (pattern.isImportant) {
      important = [resultNode, pattern];
    }
  }
  return important != null ? important : [resultNode, resultPattern];
}

function searchNodeDescending(
  node: SyntaxNode,