Method getLinesBetweenNodes

internal/printer/printer.go:446–477

(parent *ast.Node, node1 *ast.Node, node2 *ast.Node)

}

func (p *Printer) getLinesBetweenNodes(parent *ast.Node, node1 *ast.Node, node2 *ast.Node) int {
	if p.shouldElideIndentation(parent) {
		return 0
	}

	parent = skipSynthesizedParentheses(parent)
	node1 = skipSynthesizedParentheses(node1)
	node2 = skipSynthesizedParentheses(node2)

	// Always use a newline for synthesized code if the synthesizer desires it.
	if p.shouldEmitOnNewLine(node2, LFNone) {
		return 1
	}

	if p.currentSourceFile != nil && !ast.NodeIsSynthesized(parent) && !ast.NodeIsSynthesized(node1) && !ast.NodeIsSynthesized(node2) {
		if p.Options.PreserveSourceNewlines {
			return p.getEffectiveLines(
				func(includeComments bool) int {
					return getLinesBetweenRangeEndAndRangeStart(
						node1.Loc,
						node2.Loc,
						p.currentSourceFile,
						includeComments,
					)
				},
			)
		}
		return core.IfElse(rangeEndIsOnSameLineAsRangeStart(node1.Loc, node2.Loc, p.currentSourceFile), 0, 1)
	}

	return 0
}

func (p *Printer) getEffectiveLines(getLineDifference func(includeComments bool) int) int {
	// If 'preserveSourceNewlines' is disabled, we should never call this function