ReadStream.cc

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#include <utl/ReadStream.h>
#include <utl/ErrorLogger.h>

using namespace std;


namespace utl {

  string
  ReadStream::FilterComments(const string& line)
  {
    string ret;
    ret.reserve(line.size());
    bool white = false;
    for (size_t i = 0, n = line.size(); i < n; ) {
      const char c = line[i++];
      switch (c) {
      case '#':
        return ret;
      case ' ':
      case '\t':
      case '\r':
        if (!ret.empty())
          white = true;
        continue;
      case '/':
        {
          const char c2 = line[i++];
          switch (c2) {
          case '/':
            return ret;
          case '*':
            i = line.find("*/", i);
            if (i == string::npos) {
              const string err = "Only single line comments supported!";
              ERROR(err);
              throw DoesNotComputeException(err);
            }
            i += 2;
            continue;
          default:
            if (white) {
              ret.push_back(' ');
              white = false;
            }
            ret.push_back(c);
            ret.push_back(c2);
            continue;
          }
        }
      default:
        if (white) {
          ret.push_back(' ');
          white = false;
        }
        ret.push_back(c);
        continue;
      }
    }
    if (!ret.empty() && ret[ret.length()-1] == ' ')
      ret.erase(ret.length()-1);
    return ret;
  }

}