Function convertSourceSpan

packages/compiler/src/template/pipeline/src/ingest.ts:1830–1841

* Creates an absolute `ParseSourceSpan` from the relative `ParseSpan`. * * `ParseSpan` objects are relative to the start of the expression. * This method converts these to full `ParseSourceSpan` objects that * show where the span is within the overall source file. * * @param span the relative

(
  span: e.ParseSpan,
  baseSourceSpan: ParseSourceSpan | null,
)

 * @returns a `ParseSourceSpan` for the given span or null if no `baseSourceSpan` was provided.
 */
function convertSourceSpan(
  span: e.ParseSpan,
  baseSourceSpan: ParseSourceSpan | null,
): ParseSourceSpan | null {
  if (baseSourceSpan === null) {
    return null;
  }
  const start = baseSourceSpan.start.moveBy(span.start);
  const end = baseSourceSpan.start.moveBy(span.end);
  const fullStart = baseSourceSpan.fullStart.moveBy(span.start);
  return new ParseSourceSpan(start, end, fullStart);
}

/**
 * With the directive-based control flow users were able to conditionally project content using