This patched StringScanner adds line number information for current scan position and a #start_line_number override for nested StringScanners.
The start line number. Used for nested StringScanners that scan a sub-string of the source document. The kramdown parser uses this, e.g., for span level parsers.
Takes the start line number as optional second argument.
Note: The original second argument is no longer used so this should be safe.
# File lib/kramdown/utils/string_scanner.rb, line 18 def initialize(string, start_line_number = 1) super(string) @start_line_number = start_line_number || 1 @previous_pos = 0 @previous_line_number = @start_line_number end
# File lib/kramdown/utils/string_scanner.rb, line 31 def best_pos charpos end
Returns the line number for current charpos.
NOTE: Requires that all line endings are normalized to 'n'
NOTE: Normally we'd have to add one to the count of newlines to get the correct line number. However we add the one indirectly by using a one-based start_line_number.
# File lib/kramdown/utils/string_scanner.rb, line 46 def current_line_number # Not using string[@previous_pos..best_pos].count('\n') because it is slower strscan = ::StringScanner.new(string) strscan.pos = @previous_pos old_pos = pos + 1 @previous_line_number += 1 while strscan.skip_until(/\n/) && strscan.pos <= old_pos @previous_pos = (eos? ? best_pos : best_pos + 1) @previous_line_number end