Add a `SpanScanner.spanFromPosition()` method (dart-lang/string_scanner#78)

Tracking raw ints can be more efficient than tracking
`LineScannerState` objects, and allows users to do small manual
manipulations on the resulting positions.
5 files changed
tree: 05d43bca507488be062d5d626f2779e3fa14fd00
  1. pkgs/