otk using ustring for shit that draws. expended its inferface yet some more.

1 files changed, 91 insertions, 13 deletions

diff --git a/otk/ustring.cc b/otk/ustring.cc
index a04c08cf..8f3cdfc4 100644
--- a/otk/ustring.cc
+++ b/otk/ustring.cc
@@ -12,6 +12,63 @@ extern "C" {
 
 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()
 {
 }
@@ -61,23 +118,11 @@ ustring& ustring::operator+=(char c)
   return *this;
 }
 
-static ustring::size_type find_utf8_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;
-}
-
 ustring::size_type ustring::size() const
 {
   if (_utf8) {
     const char *const pdata = _string.data();
-    return find_utf8_offset(pdata, pdata + _string.size());
+    return utf8_find_offset(pdata, pdata + _string.size());
   } else
     return _string.size();
 }
@@ -97,6 +142,39 @@ ustring::size_type ustring::max_size() const
   return _string.max_size();
 }
 
+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
 {