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#include "sass.hpp" 
#include "position.hpp" 
 
namespace Sass { 
 
 
  Offset::Offset(const char chr) 
  : line(chr == '\n' ? 1 : 0), 
    column(chr == '\n' ? 0 : 1) 
  {} 
 
  Offset::Offset(const char* string) 
  : line(0), column(0) 
  { 
    *this = inc(string, string + strlen(string)); 
  } 
 
  Offset::Offset(const std::string& text) 
  : line(0), column(0) 
  { 
    *this = inc(text.c_str(), text.c_str() + text.size()); 
  } 
 
  Offset::Offset(const size_t line, const size_t column) 
  : line(line), column(column) { } 
 
  // init/create instance from const char substring 
  Offset Offset::init(const char* beg, const char* end) 
  { 
    Offset offset(0, 0); 
    if (end == 0) { 
      end += strlen(beg); 
    } 
    offset.add(beg, end); 
    return offset; 
  } 
 
  // increase offset by given string (mostly called by lexer) 
  // increase line counter and count columns on the last line 
  Offset Offset::add(const char* begin, const char* end) 
  { 
    if (end == 0) return *this; 
    while (begin < end && *begin) { 
      if (*begin == '\n') { 
        ++ line; 
        // start new line 
        column = 0; 
      } else { 
        // do not count any utf8 continuation bytes 
        // https://stackoverflow.com/a/9356203/1550314 
        // https://en.wikipedia.org/wiki/UTF-8#Description 
        unsigned char chr = *begin; 
        // skip over 10xxxxxx 
        // is 1st bit not set 
        if ((chr & 128) == 0) { 
          // regular ascii char 
          column += 1; 
        } 
        // is 2nd bit not set 
        else if ((chr & 64) == 0) { 
          // first utf8 byte 
          column += 1; 
        } 
      } 
      ++ begin; 
    } 
    return *this; 
  } 
 
  // increase offset by given string (mostly called by lexer) 
  // increase line counter and count columns on the last line 
  Offset Offset::inc(const char* begin, const char* end) const 
  { 
    Offset offset(line, column); 
    offset.add(begin, end); 
    return offset; 
  } 
 
  bool Offset::operator== (const Offset &pos) const 
  { 
    return line == pos.line && column == pos.column; 
  } 
 
  bool Offset::operator!= (const Offset &pos) const 
  { 
    return line != pos.line || column != pos.column; 
  } 
 
  void Offset::operator+= (const Offset &off) 
  { 
    *this = Offset(line + off.line, off.line > 0 ? off.column : column + off.column); 
  } 
 
  Offset Offset::operator+ (const Offset &off) const 
  { 
    return Offset(line + off.line, off.line > 0 ? off.column : column + off.column); 
  } 
 
  Offset Offset::operator- (const Offset &off) const 
  { 
    return Offset(line - off.line, off.line == line ? column - off.column : column); 
  } 
 
  Position::Position(const size_t file) 
  : Offset(0, 0), file(file) { } 
 
  Position::Position(const size_t file, const Offset& offset) 
  : Offset(offset), file(file) { } 
 
  Position::Position(const size_t line, const size_t column) 
  : Offset(line, column), file(-1) { } 
 
  Position::Position(const size_t file, const size_t line, const size_t column) 
  : Offset(line, column), file(file) { } 
 
 
  ParserState::ParserState(const char* path, const char* src, const size_t file) 
  : Position(file, 0, 0), path(path), src(src), offset(0, 0), token() { } 
 
  ParserState::ParserState(const char* path, const char* src, const Position& position, Offset offset) 
  : Position(position), path(path), src(src), offset(offset), token() { } 
 
  ParserState::ParserState(const char* path, const char* src, const Token& token, const Position& position, Offset offset) 
  : Position(position), path(path), src(src), offset(offset), token(token) { } 
 
  Position Position::add(const char* begin, const char* end) 
  { 
    Offset::add(begin, end); 
    return *this; 
  } 
 
  Position Position::inc(const char* begin, const char* end) const 
  { 
    Offset offset(line, column); 
    offset = offset.inc(begin, end); 
    return Position(file, offset); 
  } 
 
  bool Position::operator== (const Position &pos) const 
  { 
    return file == pos.file && line == pos.line && column == pos.column; 
  } 
 
  bool Position::operator!= (const Position &pos) const 
  { 
    return file == pos.file || line != pos.line || column != pos.column; 
  } 
 
  void Position::operator+= (const Offset &off) 
  { 
    *this = Position(file, line + off.line, off.line > 0 ? off.column : column + off.column); 
  } 
 
  const Position Position::operator+ (const Offset &off) const 
  { 
    return Position(file, line + off.line, off.line > 0 ? off.column : column + off.column); 
  } 
 
  const Offset Position::operator- (const Offset &off) const 
  { 
    return Offset(line - off.line, off.line == line ? column - off.column : column); 
  } 
 
  /* not used anymore - remove? 
  std::ostream& operator<<(std::ostream& strm, const Offset& off) 
  { 
    if (off.line == string::npos) strm << "-1:"; else strm << off.line << ":"; 
    if (off.column == string::npos) strm << "-1"; else strm << off.column; 
    return strm; 
  } */ 
 
  /* not used anymore - remove? 
  std::ostream& operator<<(std::ostream& strm, const Position& pos) 
  { 
    if (pos.file != string::npos) strm << pos.file << ":"; 
    if (pos.line == string::npos) strm << "-1:"; else strm << pos.line << ":"; 
    if (pos.column == string::npos) strm << "-1"; else strm << pos.column; 
    return strm; 
  } */ 
 
}