Aleppo: ALternative Erlang Pre-ProcessOr
Aleppo is an alternative to epp(3erl), and is mainly intended for Erlang compiler hackers.
erl_scan -> *aleppo* -> erl_parse -> compile
Features
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Token-oriented API. Pass in tokens returned by erl_scan, receive a list of erl_scan-compatible tokens after preprocessor macros have been applied. No parsing of Erlang code is performed!
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Support for -define, -undef, -ifdef, -ifndef, -else, -endif, -include, -include_lib
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Preprocessor directives can be used inside functions
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Virtual file system support via custom read_file function for included files
API
aleppo:process_file(FileName) -> {ok, Tokens} | {error, Error}
aleppo:process_tokens(Tokens) -> {ok, NewTokens} | {error, Error}
aleppo:process_tokens(Tokens, Options) -> {ok, NewTokens} | {error, Error}
Options = [{file, FileName}, {expand_file, fun(FileName, IncludeDirs) -> {AbsFileName, FileData}}]