#
# Used for fast access to each line when rendering parts of the `string`.
var line_starts = new Array[Int]
+
+ # Extract a given line excluding the line-terminators characters.
+ #
+ # `line_number` starts at 1 for the first line.
+ fun get_line(line_number: Int): String do
+ if line_number > line_starts.length then return ""
+ var line_start = line_starts[line_number-1]
+ var line_end = line_start
+ var string = self.string
+ while line_end+1 < string.length and string.chars[line_end+1] != '\n' and string.chars[line_end+1] != '\r' do
+ line_end += 1
+ end
+ return string.substring(line_start, line_end-line_start+1)
+ end
end
# A location inside a source file