Class ParserOptions

parser/options.h:24–63

Options for configuring the limits and features of the parser.

// Options for configuring the limits and features of the parser.
struct ParserOptions final {
  // Limit of the number of error recovery attempts made by the ANTLR parser
  // when processing an input. This limit, when reached, will halt further
  // parsing of the expression.
  int error_recovery_limit = ::cel_parser_internal::kDefaultErrorRecoveryLimit;

  // Limit on the amount of recursive parse instructions permitted when building
  // the abstract syntax tree for the expression. This prevents pathological
  // inputs from causing stack overflows.
  int max_recursion_depth = ::cel_parser_internal::kDefaultMaxRecursionDepth;

  // Limit on the number of codepoints in the input string which the parser will
  // attempt to parse.
  int expression_size_codepoint_limit =
      ::cel_parser_internal::kExpressionSizeCodepointLimit;

  // Limit on the number of lookahead tokens to consume when attempting to
  // recover from an error.
  int error_recovery_token_lookahead_limit =
      ::cel_parser_internal::kDefaultErrorRecoveryTokenLookaheadLimit;

  // Add macro calls to macro_calls list in source_info.
  bool add_macro_calls = ::cel_parser_internal::kDefaultAddMacroCalls;

  // Enable support for optional syntax.
  bool enable_optional_syntax = false;

  // Disable standard macros (has, all, exists, exists_one, filter, map).
  bool disable_standard_macros = false;

  // Enable hidden accumulator variable '@result' for builtin comprehensions.
  bool enable_hidden_accumulator_var = true;

  // Enables support for identifier quoting syntax:
  // "message.`skewer-case-field`"
  //
  // Limited to field specifiers in select and message creation,
  // enabled by default
  bool enable_quoted_identifiers = true;
};

}  // namespace cel