+bool Cursor::posVisRight(bool skip_inset)
+{
+ Cursor new_cur = *this; // where we will move to
+ pos_type left_pos; // position visually left of current cursor
+ pos_type right_pos; // position visually right of current cursor
+ bool new_pos_is_RTL; // is new position we're moving to RTL?
+
+ getSurroundingPos(left_pos, right_pos);
+
+ LYXERR(Debug::RTL, left_pos <<"|"<< right_pos << " (pos: "<< pos() <<")");
+
+ // Are we at an inset?
+ new_cur.pos() = right_pos;
+ new_cur.boundary(false);
+ if (!skip_inset &&
+ text()->checkAndActivateInsetVisual(new_cur, right_pos >= pos(), false)) {
+ // we actually move the cursor at the end of this function, for now
+ // we just keep track of the new position in new_cur...
+ LYXERR(Debug::RTL, "entering inset at: " << new_cur.pos());
+ }
+
+ // Are we already at rightmost pos in row?
+ else if (text()->empty() || right_pos == -1) {
+
+ new_cur = *this;
+ if (!new_cur.posVisToNewRow(false)) {
+ LYXERR(Debug::RTL, "not moving!");
+ return false;
+ }
+
+ // we actually move the cursor at the end of this function, for now
+ // just keep track of the new position in new_cur...
+ LYXERR(Debug::RTL, "right edge, moving: " << int(new_cur.pit()) << ","
+ << int(new_cur.pos()) << "," << (new_cur.boundary() ? 1 : 0));
+
+ }
+ // normal movement to the right
+ else {
+ new_cur = *this;
+ // Recall, if the cursor is at position 'x', that means *before*
+ // the character at position 'x'. In RTL, "before" means "to the
+ // right of", in LTR, "to the left of". So currently our situation
+ // is this: the position to our right is 'right_pos' (i.e., we're
+ // currently to the left of 'right_pos'). In order to move to the
+ // right, it depends whether or not the character at 'right_pos' is RTL.
+ new_pos_is_RTL = paragraph().getFontSettings(
+ buffer()->params(), right_pos).isVisibleRightToLeft();
+ // If the character at 'right_pos' *is* LTR, then in order to move to
+ // the right of it, we need to be *after* 'right_pos', i.e., move to
+ // position 'right_pos' + 1.
+ if (!new_pos_is_RTL) {
+ new_cur.pos() = right_pos + 1;
+ // set the boundary to true in two situations:
+ if (
+ // 1. if new_pos is now lastpos, and we're in an RTL paragraph
+ // (this means that we're moving right to the end of an LTR chunk
+ // which is at the end of an RTL paragraph);
+ (new_cur.pos() == lastpos()
+ && paragraph().isRTL(buffer()->params()))
+ // 2. if the position *after* right_pos is RTL (we want to be
+ // *after* right_pos, not before right_pos + 1!)
+ || paragraph().getFontSettings(buffer()->params(),
+ new_cur.pos()).isVisibleRightToLeft()
+ )
+ new_cur.boundary(true);
+ else // set the boundary to false
+ new_cur.boundary(false);
+ }
+ // Otherwise (if the character at position 'right_pos' is RTL), then
+ // moving to the right of it is as easy as setting the new position
+ // to 'right_pos'.
+ else {
+ new_cur.pos() = right_pos;
+ new_cur.boundary(false);
+ }
+
+ }
+
+ bool moved = (new_cur.pos() != pos()
+ || new_cur.pit() != pit()
+ || new_cur.boundary() != boundary()
+ || &new_cur.inset() != &inset());
+
+ if (moved) {
+ LYXERR(Debug::RTL, "moving to: " << new_cur.pos()
+ << (new_cur.boundary() ? " (boundary)" : ""));
+ *this = new_cur;
+ }
+
+ return moved;
+}
+
+
+bool Cursor::posVisLeft(bool skip_inset)
+{
+ Cursor new_cur = *this; // where we will move to
+ pos_type left_pos; // position visually left of current cursor
+ pos_type right_pos; // position visually right of current cursor
+ bool new_pos_is_RTL; // is new position we're moving to RTL?
+
+ getSurroundingPos(left_pos, right_pos);
+
+ LYXERR(Debug::RTL, left_pos <<"|"<< right_pos << " (pos: "<< pos() <<")");
+
+ // Are we at an inset?
+ new_cur.pos() = left_pos;
+ new_cur.boundary(false);
+ if (!skip_inset &&
+ text()->checkAndActivateInsetVisual(new_cur, left_pos >= pos(), true)) {
+ // we actually move the cursor at the end of this function, for now
+ // we just keep track of the new position in new_cur...
+ LYXERR(Debug::RTL, "entering inset at: " << new_cur.pos());
+ }
+
+ // Are we already at leftmost pos in row?
+ else if (text()->empty() || left_pos == -1) {
+
+ new_cur = *this;
+ if (!new_cur.posVisToNewRow(true)) {
+ LYXERR(Debug::RTL, "not moving!");
+ return false;
+ }
+
+ // we actually move the cursor at the end of this function, for now
+ // just keep track of the new position in new_cur...
+ LYXERR(Debug::RTL, "left edge, moving: " << int(new_cur.pit()) << ","
+ << int(new_cur.pos()) << "," << (new_cur.boundary() ? 1 : 0));
+
+ }
+ // normal movement to the left
+ else {
+ new_cur = *this;
+ // Recall, if the cursor is at position 'x', that means *before*
+ // the character at position 'x'. In RTL, "before" means "to the
+ // right of", in LTR, "to the left of". So currently our situation
+ // is this: the position to our left is 'left_pos' (i.e., we're
+ // currently to the right of 'left_pos'). In order to move to the
+ // left, it depends whether or not the character at 'left_pos' is RTL.
+ new_pos_is_RTL = paragraph().getFontSettings(
+ buffer()->params(), left_pos).isVisibleRightToLeft();
+ // If the character at 'left_pos' *is* RTL, then in order to move to
+ // the left of it, we need to be *after* 'left_pos', i.e., move to
+ // position 'left_pos' + 1.
+ if (new_pos_is_RTL) {
+ new_cur.pos() = left_pos + 1;
+ // set the boundary to true in two situations:
+ if (
+ // 1. if new_pos is now lastpos and we're in an LTR paragraph
+ // (this means that we're moving left to the end of an RTL chunk
+ // which is at the end of an LTR paragraph);
+ (new_cur.pos() == lastpos()
+ && !paragraph().isRTL(buffer()->params()))
+ // 2. if the position *after* left_pos is not RTL (we want to be
+ // *after* left_pos, not before left_pos + 1!)
+ || !paragraph().getFontSettings(buffer()->params(),
+ new_cur.pos()).isVisibleRightToLeft()
+ )
+ new_cur.boundary(true);
+ else // set the boundary to false
+ new_cur.boundary(false);
+ }
+ // Otherwise (if the character at position 'left_pos' is LTR), then
+ // moving to the left of it is as easy as setting the new position
+ // to 'left_pos'.
+ else {
+ new_cur.pos() = left_pos;
+ new_cur.boundary(false);
+ }
+
+ }
+
+ bool moved = (new_cur.pos() != pos()
+ || new_cur.pit() != pit()
+ || new_cur.boundary() != boundary());
+
+ if (moved) {
+ LYXERR(Debug::RTL, "moving to: " << new_cur.pos()
+ << (new_cur.boundary() ? " (boundary)" : ""));
+ *this = new_cur;
+ }
+
+ return moved;
+}
+
+
+void Cursor::getSurroundingPos(pos_type & left_pos, pos_type & right_pos)
+{
+ // preparing bidi tables
+ Paragraph const & par = paragraph();
+ Buffer const & buf = *buffer();
+ Row const & row = textRow();
+ Bidi bidi;
+ bidi.computeTables(par, buf, row);
+
+ LYXERR(Debug::RTL, "bidi: " << row.pos() << "--" << row.endpos());
+
+ // The cursor is painted *before* the character at pos(), or, if 'boundary'
+ // is true, *after* the character at (pos() - 1). So we already have one
+ // known position around the cursor:
+ pos_type const known_pos = boundary() && pos() > 0 ? pos() - 1 : pos();
+
+ // edge case: if we're at the end of the paragraph, things are a little
+ // different (because lastpos is a position which does not really "exist"
+ // --- there's no character there yet).
+ if (known_pos == lastpos()) {
+ if (par.isRTL(buf.params())) {
+ left_pos = -1;
+ right_pos = bidi.vis2log(row.pos());
+ } else {
+ // LTR paragraph
+ right_pos = -1;
+ left_pos = bidi.vis2log(row.endpos() - 1);
+ }
+ return;
+ }
+
+ // Whether 'known_pos' is to the left or to the right of the cursor depends
+ // on whether it is an RTL or LTR character...
+ bool const cur_is_RTL =
+ par.getFontSettings(buf.params(), known_pos).isVisibleRightToLeft();
+ // ... in the following manner:
+ // For an RTL character, "before" means "to the right" and "after" means
+ // "to the left"; and for LTR, it's the reverse. So, 'known_pos' is to the
+ // right of the cursor if (RTL && boundary) or (!RTL && !boundary):
+ bool const known_pos_on_right = cur_is_RTL == boundary();
+
+ // So we now know one of the positions surrounding the cursor. Let's
+ // determine the other one:
+ if (known_pos_on_right) {
+ right_pos = known_pos;
+ // *visual* position of 'left_pos':
+ pos_type v_left_pos = bidi.log2vis(right_pos) - 1;
+ // If the position we just identified as 'left_pos' is a "skipped
+ // separator" (a separator which is at the logical end of a row,
+ // except for the last row in a paragraph; such separators are not
+ // painted, so they "are not really there"; note that in bidi text,
+ // such a separator could appear visually in the middle of a row),
+ // set 'left_pos' to the *next* position to the left.
+ if (bidi.inRange(v_left_pos)
+ && bidi.vis2log(v_left_pos) + 1 == row.endpos()
+ && row.endpos() < lastpos()
+ && par.isSeparator(bidi.vis2log(v_left_pos)))
+ --v_left_pos;
+
+ // calculate the logical position of 'left_pos', if in row
+ if (!bidi.inRange(v_left_pos))
+ left_pos = -1;
+ else
+ left_pos = bidi.vis2log(v_left_pos);
+ // If the position we identified as 'right_pos' is a "skipped
+ // separator", set 'right_pos' to the *next* position to the right.
+ if (right_pos + 1 == row.endpos() && row.endpos() < lastpos()
+ && par.isSeparator(right_pos)) {
+ pos_type const v_right_pos = bidi.log2vis(right_pos) + 1;
+ if (!bidi.inRange(v_right_pos))
+ right_pos = -1;
+ else
+ right_pos = bidi.vis2log(v_right_pos);
+ }
+ } else {
+ // known_pos is on the left
+ left_pos = known_pos;
+ // *visual* position of 'right_pos'
+ pos_type v_right_pos = bidi.log2vis(left_pos) + 1;
+ // If the position we just identified as 'right_pos' is a "skipped
+ // separator", set 'right_pos' to the *next* position to the right.
+ if (bidi.inRange(v_right_pos)
+ && bidi.vis2log(v_right_pos) + 1 == row.endpos()
+ && row.endpos() < lastpos()
+ && par.isSeparator(bidi.vis2log(v_right_pos)))
+ ++v_right_pos;
+
+ // calculate the logical position of 'right_pos', if in row
+ if (!bidi.inRange(v_right_pos))
+ right_pos = -1;
+ else
+ right_pos = bidi.vis2log(v_right_pos);
+ // If the position we identified as 'left_pos' is a "skipped
+ // separator", set 'left_pos' to the *next* position to the left.
+ if (left_pos + 1 == row.endpos() && row.endpos() < lastpos()
+ && par.isSeparator(left_pos)) {
+ pos_type const v_left_pos = bidi.log2vis(left_pos) - 1;
+ if (!bidi.inRange(v_left_pos))
+ left_pos = -1;
+ else
+ left_pos = bidi.vis2log(v_left_pos);
+ }
+ }
+ return;
+}
+
+
+bool Cursor::posVisToNewRow(bool movingLeft)
+{
+ Paragraph const & par = paragraph();
+ Buffer const & buf = *buffer();
+ Row const & row = textRow();
+ bool par_is_LTR = !par.isRTL(buf.params());
+
+ // Inside a table, determining whether to move to the next or previous row
+ // should be done based on the table's direction.
+ int s = depth() - 1;
+ if (s >= 1 && (*this)[s].inset().asInsetTabular()) {
+ par_is_LTR = !(*this)[s].inset().asInsetTabular()->isRightToLeft(*this);
+ LYXERR(Debug::RTL, "Inside table! par_is_LTR=" << (par_is_LTR ? 1 : 0));
+ }
+
+ // if moving left in an LTR paragraph or moving right in an RTL one,
+ // move to previous row
+ if (par_is_LTR == movingLeft) {
+ if (row.pos() == 0) { // we're at first row in paragraph
+ if (pit() == 0) // no previous paragraph! don't move
+ return false;
+ // move to last pos in previous par
+ --pit();
+ pos() = lastpos();
+ boundary(false);
+ } else { // move to previous row in this par
+ pos() = row.pos() - 1; // this is guaranteed to be in previous row
+ boundary(false);
+ }
+ }
+ // if moving left in an RTL paragraph or moving right in an LTR one,
+ // move to next row
+ else {
+ if (row.endpos() == lastpos()) { // we're at last row in paragraph
+ if (pit() == lastpit()) // last paragraph! don't move
+ return false;
+ // move to first row in next par
+ ++pit();
+ pos() = 0;
+ boundary(false);
+ } else { // move to next row in this par
+ pos() = row.endpos();
+ boundary(false);
+ }
+ }
+
+ // make sure we're at left-/right-most pos in new row
+ posVisToRowExtremity(!movingLeft);
+
+ return true;
+}
+
+
+void Cursor::posVisToRowExtremity(bool left)
+{
+ // prepare bidi tables
+ Paragraph const & par = paragraph();
+ Buffer const & buf = *buffer();
+ Row const & row = textRow();
+ Bidi bidi;
+ bidi.computeTables(par, buf, row);
+
+ LYXERR(Debug::RTL, "entering extremity: " << pit() << "," << pos() << ","
+ << (boundary() ? 1 : 0));
+
+ if (left) { // move to leftmost position
+ // if this is an RTL paragraph, and we're at the last row in the
+ // paragraph, move to lastpos
+ if (par.isRTL(buf.params()) && row.endpos() == lastpos())
+ pos() = lastpos();
+ else {
+ pos() = bidi.vis2log(row.pos());
+
+ // Moving to the leftmost position in the row, the cursor should
+ // normally be placed to the *left* of the leftmost position.
+ // A very common exception, though, is if the leftmost character
+ // also happens to be the separator at the (logical) end of the row
+ // --- in this case, the separator is positioned beyond the left
+ // margin, and we don't want to move the cursor there (moving to
+ // the left of the separator is equivalent to moving to the next
+ // line). So, in this case we actually want to place the cursor
+ // to the *right* of the leftmost position (the separator).
+ // Another exception is if we're moving to the logically last
+ // position in the row, which is *not* a separator: this means
+ // that the entire row has no separators (if there were any, the
+ // row would have been broken there); and therefore in this case
+ // we also move to the *right* of the last position (this indicates
+ // to the user that there is no space after this position, and is
+ // consistent with the behavior in the middle of a row --- moving
+ // right or left moves to the next/previous character; if we were
+ // to move to the *left* of this position, that would simulate
+ // a separator which is not really there!).
+ // Finally, there is an exception to the previous exception: if
+ // this non-separator-but-last-position-in-row is an inset, then
+ // we *do* want to stay to the left of it anyway: this is the
+ // "boundary" which we simulate at insets.
+ // Another exception is when row.endpos() is 0.
+
+ // do we want to be to the right of pos?
+ // as explained above, if at last pos in row, stay to the right
+ bool const right_of_pos = row.endpos() > 0
+ && pos() == row.endpos() - 1 && !par.isInset(pos());
+
+ // Now we know if we want to be to the left or to the right of pos,
+ // let's make sure we are where we want to be.
+ bool const new_pos_is_RTL =
+ par.getFontSettings(buf.params(), pos()).isVisibleRightToLeft();
+
+ if (new_pos_is_RTL != right_of_pos) {
+ ++pos();
+ boundary(true);
+ }
+ }
+ } else {
+ // move to rightmost position
+ // if this is an LTR paragraph, and we're at the last row in the
+ // paragraph, move to lastpos
+ if (!par.isRTL(buf.params()) && row.endpos() == lastpos())
+ pos() = lastpos();
+ else {
+ pos() = row.endpos() > 0 ? bidi.vis2log(row.endpos() - 1) : 0;
+
+ // Moving to the rightmost position in the row, the cursor should
+ // normally be placed to the *right* of the rightmost position.
+ // A very common exception, though, is if the rightmost character
+ // also happens to be the separator at the (logical) end of the row
+ // --- in this case, the separator is positioned beyond the right
+ // margin, and we don't want to move the cursor there (moving to
+ // the right of the separator is equivalent to moving to the next
+ // line). So, in this case we actually want to place the cursor
+ // to the *left* of the rightmost position (the separator).
+ // Another exception is if we're moving to the logically last
+ // position in the row, which is *not* a separator: this means
+ // that the entire row has no separators (if there were any, the
+ // row would have been broken there); and therefore in this case
+ // we also move to the *left* of the last position (this indicates
+ // to the user that there is no space after this position, and is
+ // consistent with the behavior in the middle of a row --- moving
+ // right or left moves to the next/previous character; if we were
+ // to move to the *right* of this position, that would simulate
+ // a separator which is not really there!).
+ // Finally, there is an exception to the previous exception: if
+ // this non-separator-but-last-position-in-row is an inset, then
+ // we *do* want to stay to the right of it anyway: this is the
+ // "boundary" which we simulate at insets.
+ // Another exception is when row.endpos() is 0.
+
+ // do we want to be to the left of pos?
+ // as explained above, if at last pos in row, stay to the left,
+ // unless the last position is the same as the first.
+ bool const left_of_pos = row.endpos() > 0
+ && pos() == row.endpos() - 1 && !par.isInset(pos());
+
+ // Now we know if we want to be to the left or to the right of pos,
+ // let's make sure we are where we want to be.
+ bool const new_pos_is_RTL =
+ par.getFontSettings(buf.params(), pos()).isVisibleRightToLeft();
+
+ if (new_pos_is_RTL == left_of_pos) {
+ ++pos();
+ boundary(true);
+ }
+ }
+ }
+ LYXERR(Debug::RTL, "leaving extremity: " << pit() << "," << pos() << ","
+ << (boundary() ? 1 : 0));
+}
+
+