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Migration-Guide.md

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Migration Guide

Version 4.0.0

  • The try_catch and try_catch_type rules were renamed to try_catch_return_false and try_catch_type_return_false, respectively.
  • The rewind_mode values active and dontcare have been replaced by the single new value optional wherefore code using the old values needs to be updated.
  • Check whether the rewind_mode of the top-level parse() function, which is now optional by default, needs to be set to the previous value of required for your parsing runs.
  • The PEGTL generated parse_error exceptions now contain a single position object (previously a std::vector< position >). Nested exceptions are now used to convey multiple positions during nested parsing. The header tao/pegtl/contrib/nested_exceptions.hpp contains some functions to work with nested exceptions.
  • The counter used to limit the nesting depth of certain rules at runtime is no longer part of all input classes. When required it needs to be added back to the input by including tao/pegtl/contrib/input_with_depth.hpp and using objects of type tao::pegtl::input_with_depth< Input > where previously inputs of type Input were used.

Version 3.0.0

  • The build system needs to be configured for C++17 or later.
  • The macro TAO_PEGTL_NAMESPACE now defines the fully qualified namespace and was changed from pegtl to tao::pegtl. When setting TAO_PEGTL_NAMESPACE, adapt as needed; in case of doubt, add tao:: as prefix.
  • The 0-based byte_in_line was replaced with the 1-based column.
  • The control class template's apply() and apply0() must only be visible (e.g. via SFINAE) when an action class template function with the appropriate signature exists. See tao::pegtl::normal as example.
  • If you have a use-case for state's S::success() to have an extended signature to get access to the current apply_mode, rewind_mode, action- and control class (template), please let us know and we'll re-add this feature.
  • The compatibility macros starting with TAOCPP_PEGTL_ were removed, the corresponding TAO_PEGTL_-prefixed macros must be used.
  • The compatibility uppercase enumerators were removed, the corresponding lowercase enumerators must be used.
  • The compatibility peek_byte() member functions were removed, the peek_uint8() member functions must be used.
  • The compatibility header changes.hpp was removed, use the action-based change_*.hpp headers.
  • The parse tree nodes provide node->type (a std::string_view) instead of node->name().
  • The parse tree nodes provide node->string_view() and node->string() instead of node->content().

Version 2.8.0

  • All enumerators were changed from uppercase to lowercase.
  • The enumerator tracking_mode::IMMEDIATE was renamed to tracking_mode::eager.
  • The input-classes' peek_byte() member function was renamed to peek_uint8().

Compatibility enumerators and functions are provided, they will be removed in version 3.0.0.

Version 2.4.0

  • The common prefix for all macros was changed from TAOCPP_PEGTL_ to TAO_PEGTL_.

Compatibility macros are provided, they will be removed in version 3.0.0.

Version 2.0.0

Some of the changes for version 2.0.0 require modifications to any source using the PEGTL. The good news is that the semantics of all parsing rules and grammars is the same as for versions 1.x. Existing grammars will continue to work as before once the following list of mostly naming and namespace related changes is taken into account.

  • Everything in the PEGTL is now in namespace tao::pegtl.
  • The file name extensions were changed from .hh to .hpp.
  • The main include file is now <tao/pegtl.hpp>, all other include files are <tao/pegtl/*.hpp>.
  • The distribution of tasks between the parse functions and input classes was changed.
  • The string macros have been renamed from pegtl_(i)string_t to TAOCPP_PEGTL_(I)STRING.
  • The begin() member function of the input-classes is now called current().
  • The first argument to actions' apply() is now of type tao::pegtl::internal::action_input< ... >.

For flexibility and future compatibility it is recommended to "template over" the first argument to apply() as shown in Actions and States.

The pegtl part of the namespace can be controlled with the TAOCPP_PEGTL_NAMESPACE macro which is set in include/tao/pegtl/config.hpp if not defined previously.

Most of the other changes for version 2.0.0 extend or optimise the PEGTL without breaking compatibility. Applications integrated more tightly with the PEGTL might require additional changes.

Please contact the authors at taocpp(at)icemx.net for any further questions when updating the PEGTL.

Version 1.0.0

There were many important changes leading up to version 1.0.0. Please contact the authors at taocpp(at)icemx.net for any further questions when updating the PEGTL.

This document is part of the PEGTL.

Copyright (c) 2017-2023 Dr. Colin Hirsch and Daniel Frey Distributed under the Boost Software License, Version 1.0
See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt