Method findLineStartIndex

document.go:300–305

For the index of a character at a certain line, calculate the index of the first character on that line.

(index int)

// For the index of a character at a certain line, calculate the index of
// the first character on that line.
func (d *Document) findLineStartIndex(index int) (pos int, lineStartIndex int) {
	indexes := d.lineStartIndexes()
	pos = bisect.Right(indexes, index) - 1
	lineStartIndex = indexes[pos]
	return
}

// CursorPositionRow returns the current row. (0-based.)
func (d *Document) CursorPositionRow() (row int) {