unistring.h

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/*
 * Copyright (c) 2003-2023, John Wiegley.  All rights reserved.
 *
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 *
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 *   notice, this list of conditions and the following disclaimer.
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 */
 
#pragma once
 
namespace ledger {
 
int mk_wcwidth(boost::uint32_t ucs);
 
class unistring
{
public:
  static const std::size_t npos = static_cast<std::size_t>(-1);
 
  std::vector<boost::uint32_t> utf32chars;
 
  unistring() {
    TRACE_CTOR(unistring, "");
  }
  unistring(const std::string& input)
  {
    const char * p   = input.c_str();
    std::size_t  len = input.length();
 
    // This size should be at least as large as MAX_LINE in context.h
    assert(len < 4096);
    VERIFY(utf8::is_valid(p, p + len));
    utf8::unchecked::utf8to32(p, p + len, std::back_inserter(utf32chars));
 
    TRACE_CTOR(unistring, "std::string");
  }
  ~unistring() {
    TRACE_DTOR(unistring);
  }
 
  std::size_t length() const {
    return utf32chars.size();
  }
 
  std::size_t width() const {
    std::size_t width = 0;
    foreach (const boost::uint32_t& ch, utf32chars) {
      width += mk_wcwidth(ch);
    }
    return width;
  }
 
  std::string extract(const std::string::size_type begin = 0,
                      const std::string::size_type len   = 0) const
  {
    std::string            utf8result;
    std::string::size_type this_len = length();
 
    assert(begin <= this_len);
    assert(begin + len <= this_len);
 
    if (this_len)
      utf8::unchecked::utf32to8
        (utf32chars.begin() + static_cast<std::string::difference_type>(begin),
         utf32chars.begin() + static_cast<std::string::difference_type>(begin) +
         static_cast<std::string::difference_type>
         (len ? (len > this_len ? this_len : len) : this_len),
         std::back_inserter(utf8result));
 
    return utf8result;
  }
 
  std::string extract_by_width(std::string::size_type begin,
                               std::size_t            len) const
  {
    std::string utf8result;
    std::size_t this_width = width();
    std::string::size_type this_len = length();
 
    assert(begin <= this_width);
    if (begin + len > this_width)
        len = this_width - begin;
 
    std::size_t pos = 0;
    std::size_t begin_idx = 0, end_idx = 0;
    std::size_t head = 0, tail = 0;
    for (std::size_t idx = 0; idx < this_len; ++idx) {
      std::size_t w = mk_wcwidth(utf32chars[idx]);
 
      if (pos < begin) {
        if (pos + w >= begin) {
          head = std::min(pos + w, begin + len) - begin;
          begin_idx = idx + 1;
        }
      } else if (pos < begin + len) {
        if (pos + w > begin + len) {
          tail = begin + len - pos;
          end_idx = idx;
        }
        if (pos + w == begin + len) {
          tail = 0;
          end_idx = idx + 1;
        }
      }
      pos += w;
    }
 
    utf8result += std::string(head, '.');
 
    if (begin_idx < end_idx)
      utf8::unchecked::utf32to8
        (utf32chars.begin() + static_cast<std::string::difference_type>(begin_idx),
         utf32chars.begin() + static_cast<std::string::difference_type>(end_idx),
         std::back_inserter(utf8result));
 
    utf8result += std::string(tail, '.');
 
    return utf8result;
  }
 
  std::size_t find(const boost::uint32_t __s, std::size_t __pos = 0) const {
    std::size_t idx = 0;
    foreach (const boost::uint32_t& ch, utf32chars) {
      if (idx >= __pos && ch == __s)
        return idx;
      idx++;
    }
    return npos;
  }
 
  boost::uint32_t& operator[](const std::size_t index) {
    return utf32chars[index];
  }
  const boost::uint32_t& operator[](const std::size_t index) const {
    return utf32chars[index];
  }
};
 
inline void justify(std::ostream&      out,
                    const std::string& str,
                    int                width,
                    bool               right  = false,
                    bool               redden = false)
{
  if (! right) {
    if (redden) out << "\033[31m";
    out << str;
    if (redden) out << "\033[0m";
  }
 
  unistring temp(str);
 
  int spacing = width - int(temp.width());
  while (spacing-- > 0)
    out << ' ';
 
  if (right) {
    if (redden) out << "\033[31m";
    out << str;
    if (redden) out << "\033[0m";
  }
}
 
} // namespace ledger