LexLoc.cxx

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#include <assert.h>
#include <dirent.h>

#include <string>
#include <sstream>

#include <stdlib.h>  // for strtoul()

#include <libsherpa/LexLoc.hxx>
#include <libsherpa/utf8.hxx>

namespace sherpa {
  std::string
  LexLoc::asString() const
  {
    if (line) {
      std::ostringstream msg;
      msg << origin << ":"
          << line << ":" << offset;
      return msg.str();
    }
    else
      return "<internal>";
  }

  const char *
  LexLoc::c_str() const
  {
    return asString().c_str();
  }

  void
  LexLoc::updateWith(const std::string& str)
  {
    const char *s = str.c_str();
    const char *snext = s;

    while (*s) {
      uint32_t c = utf8_decode(s, &snext);
      s = snext;

      switch(c) {
      case '\n':
        {
          line++;
          offset = 0;
          break;
        }
      case '\r':
        {
          line++;
          offset = 0;
          // Check for CR LF:
          if (*snext && *snext == '\n') {
            uint32_t c = utf8_decode(s, &snext);
            s = snext;
          }
          break;
        }
      default:
        {
          offset++;
          break;
        }
      }
    }
  }

  LexLoc
  LexLoc::with(const std::string& str)
  {
    const char *s = str.c_str();
    const char *snext = s;

    unsigned theLine = line;
    unsigned theOffset = offset;

    while (*s) {
      uint32_t c = utf8_decode(s, &snext);
      s = snext;

      switch(c) {
      case '\n':
        {
          theLine++;
          theOffset = 0;
          break;
        }
      case '\r':
        {
          theLine++;
          theOffset = 0;
          // Check for CR LF:
          if (*snext && *snext == '\n') {
            uint32_t c = utf8_decode(s, &snext);
            s = snext;
          }
          break;
        }
      default:
        {
          theOffset++;
        }
      }
    }

    return LexLoc(origin, theLine, theOffset);
  }
} /* namespace sherpa */

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