Function computeValue

src/compute-engine/boxed-expression/rules.ts:1194–1207

(result: Expression)

  //@note: '.subs()' acts like an expr. 'clone' here (in case of an empty substitution)
  // An exception thrown by a `replace` *function* is treated exactly like a
  // condition exception handled by `matchRule`: log it and skip this rule
  // rather than aborting the `replace()` pass. Deadline cancellations still
  // propagate.
  let result: Expression | RuleStep | null | undefined;
  try {
    result =
      typeof replace === 'function'
        ? replace(expr, sub)
        : // @todo: 'expr.subs()' to eventually also assume a 'form' option
          // : replace.subs(sub, { form: dynamicForm ? undefined : formValue });
          replace.subs(sub, { canonical: getFormType() === 'canonical' });
  } catch (e) {
    if (e instanceof CancellationError) throw e;
    console.error(
      `\n|   Rule "${rule.id}"\n|   Error while applying replacement\n|    ${
        e instanceof Error ? e.message : e