/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying

   file LICENSE.rst or https://cmake.org/licensing for details.  */

#include "cmPlistParser.h"

#include <iterator>

#include <sstream>

#include <string>

#include <vector>

#include <cm3p/json/value.h>

#include "cmJSONState.h"

#include "cmUVProcessChain.h"

#include "cmUVStream.h"

cm::optional<Json::Value> cmParsePlist(std::string const& filename)

{

  cmUVProcessChainBuilder builder;

  builder.AddCommand(

    { "/usr/bin/plutil", "-convert", "json", "-o", "-", filename });

  builder.SetBuiltinStream(cmUVProcessChainBuilder::Stream_OUTPUT);

  auto chain = builder.Start();

  chain.Wait();

  auto const& status = chain.GetStatus(0);

  if (status.ExitStatus != 0) {

    return cm::nullopt;

  }

  // Buffer plutil's output into a seekable stream. cmJSONState must be able

  // peek at a leading BOM, which the process pipe behind cmUVIStream can't

  // handle.

  cmUVIStream outputStream(chain.OutputStream());

  std::string output{ std::istreambuf_iterator<char>(outputStream),

                      std::istreambuf_iterator<char>() };

  std::istringstream jsonStream(output);

  Json::Value value;

  cmJSONState parseState(jsonStream, &value, cmJSONState::StrictMode::Relaxed);

  if (!parseState.errors.empty()) {

    return cm::nullopt;

  }

  return cm::optional<Json::Value>(value);

}