Method cmJSONState

Source/cmJSONState.cxx:19–61

#include "cmSystemTools.h"

cmJSONState::cmJSONState(std::string jsonFile, Json::Value* root)
  : Filename(std::move(jsonFile))
{
  cmsys::ifstream fin(this->Filename.c_str(), std::ios::in | std::ios::binary);
  if (!fin) {
    this->AddError(cmStrCat("File not found: ", this->Filename));
    return;
  }
  // If there's a BOM, toss it.
  cmsys::FStream::ReadBOM(fin);

  // Save the entire document.
  std::streampos finBegin = fin.tellg();
  this->doc = std::string(std::istreambuf_iterator<char>(fin),
                          std::istreambuf_iterator<char>());
  if (this->doc.empty()) {
    this->AddError("A JSON document cannot be empty");
    return;
  }
  fin.seekg(finBegin);

  Json::CharReaderBuilder builder;
  Json::CharReaderBuilder::strictMode(&builder.settings_);
  std::string errMsg;

#if JSONCPP_VERSION_HEXA >= 0x01090600
  // Has StructuredError
  std::unique_ptr<Json::CharReader> const reader(builder.newCharReader());
  reader->parse(doc.data(), doc.data() + doc.size(), root, &errMsg);
  std::vector<Json::CharReader::StructuredError> structuredErrors =
    reader->getStructuredErrors();
  for (auto const& structuredError : structuredErrors) {
    this->AddErrorAtOffset(structuredError.message,
                           structuredError.offset_start);
  }
#else
  // No StructuredError Available, Use error string from jsonCpp
  if (!Json::parseFromStream(builder, fin, root, &errMsg)) {
    errMsg = cmStrCat("JSON Parse Error: ", this->Filename, ":\n", errMsg);
    this->AddError(errMsg);
  }
#endif
}

void cmJSONState::AddError(std::string const& errMsg)
{