format_source_snippet

func format_source_snippet(source: &String) -> String

Normalizes a declaration extracted from a nested source range.

Extraction removes the declaration's first-line indentation but retains its owner's indentation on later lines. This removes that common closing-line indent and trailing horizontal whitespace while preserving the source's token spacing and line breaks.

View Source

pub func format_source_snippet(source: &String) -> String {
	let lines: [String] = []
	for line in source.split(character: '\n').into_iter() {
		lines.push(trim_trailing_space(line: line.to_string()))
	}
	let indent = 0
	let index = lines.count - 1
	loop index > 0 {
		if lines[index].byte_count > 0 {
			indent = leading_indent(line: lines[index])
			break
		}
		index = index - 1
	}
	let output = StringBuilder()
	let line_index = 0
	loop line_index < lines.count {
		let line: &String = lines[line_index]
		let remove = if line_index > 0 && leading_indent(line: line) >= indent { indent } else { 0 }
		output.append(string: byte_slice(text: line, start: remove, end: line.byte_count))
		if line_index + 1 < lines.count { output.append(character: '\n') }
		line_index = line_index + 1
	}
	output.finish()
}