sheetjs/bits/25_cellutils.js

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/* XLS ranges enforced */
function shift_cell_xls(cell, tgt) {
if(tgt.s) {
if(cell.cRel) cell.c += tgt.s.c;
if(cell.rRel) cell.r += tgt.s.r;
} else {
cell.c += tgt.c;
cell.r += tgt.r;
}
cell.cRel = cell.rRel = 0;
while(cell.c >= 0x100) cell.c -= 0x100;
while(cell.r >= 0x10000) cell.r -= 0x10000;
return cell;
}
function shift_range_xls(cell, range) {
cell.s = shift_cell_xls(cell.s, range.s);
cell.e = shift_cell_xls(cell.e, range.s);
return cell;
}