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Merge pull request eproxus#56 from rzezeski/rz-passthrough-cover
Record cover data on passtrhough calls
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| %%============================================================================== | ||
| %% Licensed under the Apache License, Version 2.0 (the "License"); | ||
| %% you may not use this file except in compliance with the License. | ||
| %% You may obtain a copy of the License at | ||
| %% | ||
| %% http://www.apache.org/licenses/LICENSE-2.0 | ||
| %% | ||
| %% Unless required by applicable law or agreed to in writing, software | ||
| %% distributed under the License is distributed on an "AS IS" BASIS, | ||
| %% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| %% See the License for the specific language governing permissions and | ||
| %% limitations under the License. | ||
| %%============================================================================== | ||
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| %% @doc Module containing functions needed by meck to integrate with cover. | ||
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| -module(meck_cover). | ||
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| %% Interface exports | ||
| -export([compile_beam/2]). | ||
| -export([rename_module/2]). | ||
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| %%============================================================================== | ||
| %% Interface exports | ||
| %%============================================================================== | ||
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| %% @doc Enabled cover on `<name>_meck_original'. | ||
| compile_beam(OriginalMod, Bin) -> | ||
| alter_cover(), | ||
| {ok, _} = cover:compile_beam(OriginalMod, Bin). | ||
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| %% @doc Given a cover file `File' exported by `cover:export' overwrite | ||
| %% the module name with `Name'. | ||
| rename_module(File, Name) -> | ||
| NewTerms = change_cover_mod_name(read_cover_file(File), Name), | ||
| write_terms(File, NewTerms), | ||
| ok. | ||
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| %%============================================================================== | ||
| %% Internal functions | ||
| %%============================================================================== | ||
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| %% @private | ||
| %% | ||
| %% @doc Alter the cover BEAM module to export some of it's private | ||
| %% functions. This is done for two reasons: | ||
| %% | ||
| %% 1. Meck needs to alter the export analysis data on disk and | ||
| %% therefore needs to understand this format. This is why `get_term' | ||
| %% and `write' are exposed. | ||
| %% | ||
| %% 2. In order to avoid creating temporary files meck needs direct | ||
| %% access to `compile_beam/2' which allows passing a binary. | ||
| alter_cover() -> | ||
| case lists:member({compile_beam,2}, cover:module_info(exports)) of | ||
| true -> | ||
| ok; | ||
| false -> | ||
| Beam = meck_mod:beam_file(cover), | ||
| AbsCode = meck_mod:abstract_code(Beam), | ||
| Exports = [{compile_beam, 2}, {get_term, 1}, {write, 2}], | ||
| AbsCode2 = meck_mod:add_exports(Exports, AbsCode), | ||
| meck_mod:compile_and_load_forms(AbsCode2) | ||
| end. | ||
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| change_cover_mod_name(CoverTerms, Name) -> | ||
| {_, Terms} = lists:foldl(fun change_name_in_term/2, {Name,[]}, CoverTerms), | ||
| Terms. | ||
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| change_name_in_term({file, Mod, File}, {Name, Terms}) -> | ||
| Term2 = {file, Name, replace_string(File, Mod, Name)}, | ||
| {Name, [Term2|Terms]}; | ||
| change_name_in_term({Bump={bump,_,_,_,_,_},_}=Term, {Name, Terms}) -> | ||
| Bump2 = setelement(2, Bump, Name), | ||
| Term2 = setelement(1, Term, Bump2), | ||
| {Name, [Term2|Terms]}; | ||
| change_name_in_term({_Mod,Clauses}, {Name, Terms}) -> | ||
| Clauses2 = lists:foldl(fun change_name_in_clause/2, {Name, []}, Clauses), | ||
| Term2 = {Name, Clauses2}, | ||
| {Name, [Term2|Terms]}. | ||
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| change_name_in_clause(Clause, {Name, NewClauses}) -> | ||
| {Name, [setelement(1, Clause, Name)|NewClauses]}. | ||
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| replace_string(File, Old, New) -> | ||
| Old2 = atom_to_list(Old), | ||
| New2 = atom_to_list(New), | ||
| re:replace(File, Old2, New2, [{return, list}]). | ||
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| read_cover_file(File) -> | ||
| {ok, Fd} = file:open(File, [read, binary, raw]), | ||
| Terms = get_terms(Fd, []), | ||
| file:close(Fd), | ||
| Terms. | ||
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| get_terms(Fd, Terms) -> | ||
| case cover:get_term(Fd) of | ||
| eof -> Terms; | ||
| Term -> get_terms(Fd, [Term|Terms]) | ||
| end. | ||
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| write_terms(File, Terms) -> | ||
| {ok, Fd} = file:open(File, [write, binary, raw]), | ||
| lists:map(write_term(Fd), Terms), | ||
| ok. | ||
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| write_term(Fd) -> | ||
| fun(Term) -> cover:write(Term, Fd) end. | ||
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