Function buildCopySegments

internal/sheetsvalidation/copy.go:334–457

(
	source, destination *sheets.GridRange,
	transpose bool,
	spans []Span,
)

}

func buildCopySegments(
	source, destination *sheets.GridRange,
	transpose bool,
	spans []Span,
) ([]copySegment, error) {
	sourceHeight := source.EndRowIndex - source.StartRowIndex
	sourceWidth := source.EndColumnIndex - source.StartColumnIndex

	patternHeight, patternWidth := sourceHeight, sourceWidth
	if transpose {
		patternHeight, patternWidth = sourceWidth, sourceHeight
	}
	rowTiles := (destination.EndRowIndex - destination.StartRowIndex) / patternHeight
	colTiles := (destination.EndColumnIndex - destination.StartColumnIndex) / patternWidth

	patternSegments := make([]copySegment, 0, len(spans))
	for _, span := range spans {
		ruleKey, err := ruleKeyForValidation(span.Rule)
		if err != nil {
			return nil, err
		}

		patternSegments = append(patternSegments, copySegment{
			StartRow: span.StartRow,
			EndRow:   span.EndRow,
			StartCol: span.StartCol,
			EndCol:   span.EndCol,
			RuleKey:  ruleKey,
			Rule:     span.Rule,
		})
	}
	patternSegments = mergeCopySegments(patternSegments)

	segments := make([]copySegment, 0, len(patternSegments))
	var err error

	for _, patternSegment := range patternSegments {
		relRowStart := patternSegment.StartRow - source.StartRowIndex
		relRowEnd := patternSegment.EndRow - source.StartRowIndex
		relColStart := patternSegment.StartCol - source.StartColumnIndex
		relColEnd := patternSegment.EndCol - source.StartColumnIndex
		mappedRowStart, mappedRowEnd := relRowStart, relRowEnd

		mappedColStart, mappedColEnd := relColStart, relColEnd
		if transpose {
			mappedRowStart, mappedRowEnd = relColStart, relColEnd
			mappedColStart, mappedColEnd = relRowStart, relRowEnd
		}
		fullRows := mappedRowStart == 0 && mappedRowEnd == patternHeight

		fullCols := mappedColStart == 0 && mappedColEnd == patternWidth
		if fullRows && fullCols {
			segments, err = appendCopySegment(segments, copySegment{
				StartRow: destination.StartRowIndex,
				EndRow:   destination.EndRowIndex,
				StartCol: destination.StartColumnIndex,
				EndCol:   destination.EndColumnIndex,
				RuleKey:  patternSegment.RuleKey,