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%% -*- erlang-indent-level: 4;indent-tabs-mode: nil -*-
%% ex: ts=4 sw=4 et
%% -------------------------------------------------------------------
%%
%% rebar: Erlang Build Tools
%%
%% Copyright (c) 2010 Cliff Moon (cliff@moonpolysoft.com)
%%
%% Permission is hereby granted, free of charge, to any person obtaining a copy
%% of this software and associated documentation files (the "Software"), to deal
%% in the Software without restriction, including without limitation the rights
%% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
%% copies of the Software, and to permit persons to whom the Software is
%% furnished to do so, subject to the following conditions:
%%
%% The above copyright notice and this permission notice shall be included in
%% all copies or substantial portions of the Software.
%%
%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
%% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
%% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
%% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
%% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
%% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
%% THE SOFTWARE.
%% -------------------------------------------------------------------
%% The rebar_neotoma module is a plugin for rebar that compiles
%% neotoma peg files. By default, it compiles all src/*.peg to src/*.erl
%%
%% Configuration options should be placed in rebar.config under
%% neotoma_opts. Available options include:
%%
%% doc_root: where to find the peg files to compile.
%% "src" by default
%% out_dir: where to put the generated erl files.
%% "src" by defualt
%% module_ext: characters to append to the module's name.
%% "" by default
%% source_ext: extension of peg source files
-module(rebar_neotoma_compiler).
-export([compile/2]).
-include("rebar.hrl").
%% ============================================================================
%% Public API
%% ============================================================================
compile(Config, _AppFile) ->
NeoOpts = neotoma_opts(Config),
rebar_base_compiler:run(Config, [],
option(doc_root, NeoOpts), ".peg",
option(out_dir, NeoOpts),
option(module_ext, NeoOpts) ++ ".beam",
fun compile_neo/3, [{check_last_mod,false}]).
%% ============================================================================
%% Public API
%% ============================================================================
neotoma_opts(Config) ->
rebar_config:get(Config, neotoma_opts, []).
option(Opt, Options) ->
proplists:get_value(Opt, Options, default(Opt)).
default(doc_root) -> "src";
default(out_dir) -> "src";
default(module_ext) -> "";
default(source_ext) -> ".peg".
compile_neo(Source, Target, Config) ->
case code:which(neotoma) of
non_existing ->
?ERROR("~n===============================================~n"
" You need to install neotoma to compile PEG grammars~n"
" Download the latest tarball release from github~n"
" https://github.com/seancribbs/neotoma~n"
" and install it into your erlang library dir~n"
"===============================================~n~n", []),
?FAIL;
_ ->
case needs_compile(Source, Target, Config) of
true ->
do_compile(Source, Target, Config);
false ->
skipped
end
end.
do_compile(Source, _Target, Config) ->
%% TODO: Check last mod on target and referenced DTLs here..
NeoOpts = neotoma_opts(Config),
%% ensure that doc_root and out_dir are defined,
%% using defaults if necessary
Opts = [{output, option(out_dir, NeoOpts)},
{module, list_to_atom(filename:basename(Source, ".peg")
++ option(module_ext, NeoOpts))}],
case neotoma:file(Source, Opts ++ NeoOpts) of
ok ->
ok;
Reason ->
?ERROR("Compiling peg ~s failed:~n ~p~n",
[Source, Reason]),
?FAIL
end.
needs_compile(Source, Target, Config) ->
LM = filelib:last_modified(Target),
LM < filelib:last_modified(Source) orelse
lists:any(fun(D) -> LM < filelib:last_modified(D) end,
referenced_pegs(Source, Config)).
referenced_pegs(Source, Config) ->
Set = referenced_pegs1([Source], Config,
sets:add_element(Source, sets:new())),
sets:to_list(sets:del_element(Source, Set)).
referenced_pegs1(Step, Config, Seen) ->
NeoOpts = neotoma_opts(Config),
ExtMatch = re:replace(option(source_ext, NeoOpts), "\.", "\\\\\\\\.",
[{return, list}]),
ShOpts = [{use_stdout, false}, return_on_error],
AllRefs =
lists:append(
[begin
Cmd = lists:flatten(["grep -o [^\\\"]*",
ExtMatch, " ", F]),
case rebar_utils:sh(Cmd, ShOpts) of
{ok, Res} ->
string:tokens(Res, "\n");
{error, _} ->
""
end
end || F <- Step]),
DocRoot = option(doc_root, NeoOpts),
WithPaths = [ filename:join([DocRoot, F]) || F <- AllRefs ],
Existing = [F || F <- WithPaths, filelib:is_regular(F)],
New = sets:subtract(sets:from_list(Existing), Seen),
case sets:size(New) of
0 -> Seen;
_ -> referenced_pegs1(sets:to_list(New), Config,
sets:union(New, Seen))
end.
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