otk/ustring.cc (raw)
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// -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 2; -*- #ifdef HAVE_CONFIG_H # include "../config.h" #endif // HAVE_CONFIG_H #include "ustring.hh" extern "C" { #include <assert.h> } namespace otk { // helper functions static ustring::size_type utf8_find_offset(const char *str, const char *pos) { ustring::size_type offset = 0; while (str < pos) { str += g_utf8_skip[*str]; offset += g_utf8_skip[*str]; } return offset; } // First overload: stop on '\0' character. ustring::size_type utf8_byte_offset(const char* str, ustring::size_type offset) { if(offset == ustring::npos) return ustring::npos; const char* p = str; for(; offset != 0; --offset) { if(*p == '\0') return ustring::npos; p += g_utf8_skip[*p]; } return (p - str); } // Second overload: stop when reaching maxlen. ustring::size_type utf8_byte_offset(const char* str, ustring::size_type offset, ustring::size_type maxlen) { if(offset == ustring::npos) return ustring::npos; const char *const pend = str + maxlen; const char* p = str; for(; offset != 0; --offset) { if(p >= pend) return ustring::npos; p += g_utf8_skip[*p]; } return (p - str); } // ustring methods ustring::ustring() { } ustring::~ustring() { } ustring::ustring(const ustring& other) : _string(other._string), _utf8(other._utf8) { } ustring& ustring::operator=(const ustring& other) { _string = other._string; _utf8 = other._utf8; return *this; } ustring::ustring(const std::string& src) : _string(src), _utf8(true) { } ustring::ustring(const char* src) : _string(src), _utf8(true) { } ustring& ustring::operator+=(const ustring& src) { assert(_utf8 == src._utf8); _string += src._string; return *this; } ustring& ustring::operator+=(const char* src) { _string += src; return *this; } ustring& ustring::operator+=(char c) { _string += c; return *this; } ustring::size_type ustring::size() const { if (_utf8) { const char *const pdata = _string.data(); return utf8_find_offset(pdata, pdata + _string.size()); } else return _string.size(); } ustring::size_type ustring::bytes() const { return _string.size(); } ustring::size_type ustring::capacity() const { return _string.capacity(); } ustring::size_type ustring::max_size() const { return _string.max_size(); } bool ustring::empty() const { return _string.empty(); } void ustring::clear() { _string.erase(); } ustring& ustring::erase(ustring::size_type i, ustring::size_type n) { if (_utf8) { // find a proper offset size_type utf_i = utf8_byte_offset(_string.c_str(), i); if (utf_i != npos) { // if the offset is not npos, find a proper length for 'n' size_type utf_n = utf8_byte_offset(_string.data() + utf_i, n, _string.size() - utf_i); _string.erase(utf_i, utf_n); } } else _string.erase(i, n); return *this; } void ustring::resize(ustring::size_type n, char c) { if (_utf8) { const size_type size_now = size(); if(n < size_now) erase(n, npos); else if(n > size_now) _string.append(n - size_now, c); } else _string.resize(n, c); } const char* ustring::data() const { return _string.data(); } const char* ustring::c_str() const { return _string.c_str(); } bool ustring::utf8() const { return _utf8; } void ustring::setUtf8(bool utf8) { _utf8 = utf8; } } |