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// -*- c++ -*-
// Distributed under the BSD 2-Clause License.
// See accompanying file LICENSE for details.
#include "deps.h"
#include "util.h"
#include <nlohmann/json.hpp>
#include <fstream>
namespace {
/* Format example:
build/src/libctor_a-libctor_cc.o: src/libctor.cc \
src/getoptpp/getoptpp.hpp src/ctor.h src/configure.h src/rebuild.h \
src/A\ B\ C.h src/task.h src/build.h src/unittest.h
*/
std::vector<std::string> readDepsMake(const std::string& dep_file)
{
auto str = readFile(dep_file);
std::vector<std::string> output;
std::string tmp;
enum class State
{
pre_colon,
post_colon,
in_escape,
} state{State::pre_colon};
auto old_state{state};
for(const auto& c : str)
{
if(c == '\r')
{
// just always ignore windows extra newline char
continue;
}
switch(state)
{
case State::pre_colon:
if(c == ':') // ignore everything until the colon
{
state = State::post_colon;
continue;
}
continue;
case State::post_colon:
if(c == '\n')
{
// done
if(!tmp.empty())
{
output.emplace_back(tmp);
}
return output;
}
if(c == '\\')
{
old_state = state;
state = State::in_escape;
continue;
}
if(c == '\t' || c == ' ') // new token
{
if(!tmp.empty())
{
output.emplace_back(tmp);
}
tmp.clear();
continue;
}
break;
case State::in_escape:
if(c == '\n')
{
// linewrap
state = old_state;
continue;
}
state = old_state;
break;
}
tmp += c;
}
if(!tmp.empty())
{
output.emplace_back(tmp);
}
return output;
}
// https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p1689r5.html
// https://devblogs.microsoft.com/cppblog/introducing-source-dependency-reporting-with-msvc-in-visual-studio-2019-version-16-7/
/* Format examples:
{
"Version": "1.1",
"Data": {
"Source": "z:\\home\\deva\\docs\\c\\ctor\\src\\libctor.cc",
"ProvidedModule": "",
"Includes": [
"c:\\program files (x86)\\microsoft visual studio\\2019\\buildtools\\vc\\tools\\msvc\\14.29.30133\\include\\vector",
"c:\\program files (x86)\\microsoft visual studio\\2019\\buildtools\\vc\\tools\\msvc\\14.29.30133\\include\\yvals_core.h",
"c:\\program files (x86)\\microsoft visual studio\\2019\\buildtools\\vc\\tools\\msvc\\14.29.30133\\include\\vcruntime.h",
.
.
.
"z:\\home\\deva\\docs\\c\\ctor\\src\\unittest.h"
],
"ImportedModules": [],
"ImportedHeaderUnits": []
}
}
*/
/*
{
"Version": "1.2",
"Data": {
"Source": "c:\\jenkins\\workspace\\ctor-linux64\\src\\build.cc",
"ProvidedModule": "",
"Includes": [
"c:\\jenkins\\workspace\\ctor-linux64\\src\\build.h",
"c:\\program files (x86)\\microsoft visual studio\\2022\\buildtools\\vc\\tools\\msvc\\14.42.34433\\include\\string",
"c:\\program files (x86)\\microsoft visual studio\\2022\\buildtools\\vc\\tools\\msvc\\14.42.34433\\include\\yvals_core.h",
.
.
.
"c:\\program files (x86)\\microsoft visual studio\\2022\\buildtools\\vc\\tools\\msvc\\14.42.34433\\include\\iostream"
],
"ImportedModules": [],
"ImportedHeaderUnits": []
}
}
*/
std::vector<std::string> readDepsJson(const std::string& dep_file)
{
std::ifstream stream(dep_file);
auto json = nlohmann::json::parse(stream);
for(const auto& [key, value] : json.items())
{
if(key == "Data" && value.is_object())
{
for(const auto& [inner_key, inner_value] : value.items())
{
if(inner_key == "Includes" && inner_value.is_array())
{
std::vector<std::string> deps;
for(const auto& dep : inner_value)
{
deps.emplace_back(dep);
}
return deps;
}
}
}
}
return {};
}
}
std::vector<std::string> readDeps(const std::string& dep_file,
ctor::toolchain toolchain)
{
if(!std::filesystem::exists(dep_file))
{
return {};
}
switch(toolchain)
{
case ctor::toolchain::any:
case ctor::toolchain::none:
return {};
// json based:
case ctor::toolchain::msvc:
return readDepsJson(dep_file);
// makefile .d file based:
case ctor::toolchain::gcc:
case ctor::toolchain::clang:
return readDepsMake(dep_file);
}
return {};
}
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