Basile STARYNKEVITCH - 2013-04-01

Hello,

I want to parse an ifstream containing several JSON objects or arrays, separated by some comment separator lines. So my input is 

{
 "@format" : "BiBi2013a",
 "dict" : 
 {
  "long" : 1,
  "type" : 3
 },
 "nbitems" : 2
}
///build 2
[

 {
  "@buid" : 1,
  "@type" : "itemvector"
 },

 {
  "@buid" : 3,
  "@type" : "itemvector"
 }
]

And I want somehow to parse (outside of JSON, using e.g. the 

getline()

function on 

std::ifstream

, the separating "comment" (which I don't want to be parsed with JsonCpp) i.e. 

///build 2

. Actually, I am generating that JSON file in the same program, so I could replace the 

//build 2

with something else e.g. 

#build 2

if so wished. However, I really need to parse several JSON values.

I tried without success 

#define FATAL(Out) do { i   \
  std::clog << __FILE__ << ":" << __LINE__      \
        << " " << Out << ";"        \
            << std::endl; abort(); } while(0)
#define DEBUG(Out) do {         \
  std::clog << __FILE__ << ":" << __LINE__  \
  << " " << Out << std::endl; } while (0)
int main (int argc, char**argv)
{
  const char* inpath = argv[1];
  std::ifstream ins(inpath,std::ifstream::in);
  Json::Features jfeatures;
  jfeatures.allowComments_ = false;
  jfeatures.strictRoot_ = false;
  Json::Value jhead;
  Json::Value jbuild;
  {
    Json::Reader readj(jfeatures);
    if (!readj.parse(ins,jhead))
      FATAL("failed to parse header from " << inpath);
  }
  DEBUG("tellg " << ins.tellg() << " jhead=" << jhead);
  unsigned lincnt=0;
  std::string linstr;
  while (!ins.eof()) {
    linstr.clear();
    ins.clear();
    getline (ins,linstr);
    lincnt++;
    DEBUG("lincnt=" << lincnt << " linstr='" << linstr << "' empty=" << linstr.empty() << " eof=" << ins.eof());
    if (ins.eof()) break;
    if (linstr[0] == '/') break;
    if (linstr.empty()) continue;
  };
  {
    Json::Reader readj(jfeatures);
  if (!readj.parse(ins,jbuild))
    FATAL("failed to parse build from " << inpath);
  }
  DEBUG("jbuild:" << jbuild);
}

and several other variants, but nothing seems to work.

Any advices?

Regards.

Basile Starynkevitch   http://starynkevitch.net/Basile/