eltex-ecss/pt_scripts

Parse transform scripts

Includes:

• pt_lazy_case.erl - case unfolds from a tuple
• pt_const_fun.erl - replaces the function with constant data on the results of their work
• pt_build_info.erl - add get_info() returned git info for build project
• pt_fabric.erl - parametrized modules
• pt_fun_guards.erl - allow lists:member in guards test
• pt_guard.erl - allow user function in guards test
• pt_gen_proxy.erl - generated proxy modules
• pt_macro.erl - add macro for func,args name and compile time regexp
• pt_pmodule.erl - parametrized modules
• pt_recompilable.erl - mutable modules
• pt_records.erl - access to records field in compile time
• pt_str_parser.erl - add string:match for easy regexp
• pt_versioned.erl - add build_info function
• pt_pp.erl

Usages:

For usage pt_script include needs header:

-include_lib("pt_scripts/include/pt_records.hrl").

Or add compile options:

-compile({parse_transform, pt_records}).

For work pt_lazy_case need to connect -include_lib("pt_scripts/include/pt_lazy_case.hrl") and to use macro ?lazy_case before the next type of structures

X = case {...} of ... end
or
case {...} of ... end

When using pt_lazy_case has the following limitations:

1) As the case is allowed only tuple
2) For variables, the Guard is not recommended, and for the tuple, is prohibited.
3) Matching also should be consistent, for example
    case {A1, A2} of
        {line, 'UserStr'} ->
            ok1;
        {message, 'UserStr'}  ->
            ok2;
        {message, 'UserStrLine'} ->
            ok3;
        {line, 'UserStrLine'} ->
            ok4;
        {_, 'UserStr'} ->
            ok5;
        {_, 'UserStrLine'} ->
            ok6;
        _ ->
            ok7
    end.
4) This module is not stable and requires the use only when tuple is composed of slow functions
(use at your own risk)