/*
* move the cursor left one character
*/
void CHtmlInputBuf::move_left(int extend, int word)
{
size_t idx;
/* if not already showing the caret, make it visible again */
show_caret();
/* if we're already at the start of the command, there's nothing to do */
if (caret_ == 0)
return;
/* start by moving back one character */
idx = prevchar(caret_);
/* if moving by a word, skip to the start of the current/prior word */
if (word)
{
/* move left until we're not in spaces */
while (idx > 0 && is_space(buf_[idx]))
idx = prevchar(idx);
/* move left until the character to the left is a space */
while (idx > 0 && !is_space(buf_[prevchar(idx)]))
idx = prevchar(idx);
}
/* adjust selection */
adjust_sel(idx, extend);
}
void
Buffer::delchar()
{
if (m_cur.x != 0) {
m_lines[m_cur.y].erase(m_cur.x - 1, 1);
prevchar();
}
else if (m_cur.y != 0) {
string old_line = m_lines[m_cur.y];
m_lines.erase(m_lines.begin() + m_cur.y);
prevchar();
// Append what was left of the erased line to the now current line
m_lines[m_cur.y] += old_line;
}
}
void
Buffer::update(int ch)
{
switch (ch) {
case KEY_UP:
prevline();
break;
case KEY_DOWN:
nextline();
break;
case KEY_RIGHT:
nextchar();
break;
case KEY_LEFT:
prevchar();
break;
case KEY_HOME:
begofline();
break;
case KEY_END:
endofline();
break;
case 127:
delchar();
break;
case '\n':
case '\r':
newline();
break;
default:
addchar(ch);
}
}
/*
* backspace
*/
int CHtmlInputBuf::backspace()
{
/* if not already showing the caret, make it visible again */
show_caret();
/* see if there's a selection range */
if (sel_start_ != sel_end_)
{
/* there's a range - delete it */
return del_selection();
}
else if (caret_ > 0)
{
/* save undo */
save_undo();
/*
* no range - delete character to left of cursor. Move the
* characters to the right of the cursor over the character to
* the left of the cursor, if necessary.
*/
size_t prv = prevchar(caret_);
if (len_ > caret_)
memmove(buf_ + prv, buf_ + caret_, len_ - caret_);
/* it's now one character shorter */
len_ -= (caret_ - prv);
/* back up the caret one position */
sel_start_ = sel_end_ = caret_ = prv;
/* we made a change */
return TRUE;
}
else
{
/* we didn't change anything */
return FALSE;
}
}
