epp
(stdlib)An Erlang Code Preprocessor
The Erlang code preprocessor includes functions which are used
by compile to preprocess macros and include files before
the actual parsing takes place.
Functions
open(FileName, IncludePath) ->
{ok, Epp} | {error, ErrorDescriptor}
FileName = file:name()IncludePath = [DirectoryName :: file:name()]Epp = epp_handle()ErrorDescriptor = term()
open(FileName, IncludePath, PredefMacros) ->
{ok, Epp} | {error, ErrorDescriptor}
FileName = file:name()IncludePath = [DirectoryName :: file:name()]PredefMacros = macros()Epp = epp_handle()ErrorDescriptor = term()
Opens a file for preprocessing.
parse_erl_form(Epp) ->
{ok, AbsForm} | {eof, Line} | {error, ErrorInfo}
Epp = epp_handle()AbsForm = erl_parse:abstract_form()Line = erl_scan:line()ErrorInfo = erl_scan:error_info() | erl_parse:error_info()
Returns the next Erlang form from the opened Erlang source file.
The tuple {eof, is returned at end-of-file. The first
form corresponds to an implicit attribute -file(File,1)., where
File is the name of the file.
parse_file(FileName, IncludePath, PredefMacros) ->
{ok, [Form]} | {error, OpenError}
FileName = file:name()IncludePath = [DirectoryName :: file:name()]Form =
erl_parse:abstract_form() | {error, ErrorInfo} | {eof, Line}PredefMacros = macros()Line = erl_scan:line()ErrorInfo = erl_scan:error_info() | erl_parse:error_info()OpenError = file:posix() | badarg | system_limit
Preprocesses and parses an Erlang source file.
Note that the tuple {eof, returned at end-of-file is
included as a "form".
format_error(ErrorDescriptor) -> io_lib:chars()
ErrorDescriptor = term()
Takes an ErrorInfo
structure (see below).
Error Information
The ErrorInfo mentioned above is the standard
ErrorInfo structure which is returned from all IO
modules. It has the following format:
{ErrorLine, Module, ErrorDescriptor}
A string which describes the error is obtained with the following call:
Module:format_error(ErrorDescriptor)