Font.ttf.coverage.walk: def of gralha-truetype@0.1.0.1
Import: import gralha-truetype@0.1.0.1/font.bend as Font
Lines 604-611 of gralha-truetype@0.1.0.1/font.bend: https://jend.leeeet.dev/read.txt?path=gralha-truetype@0.1.0.1/font.bend&start_line=604&end_line=611

import Base
import gralha-text-scan@0.1.0.1/scan.bend as U
import gralha-bytes@0.1.0.1/bytes.bend as Bin

def ttf.coverage.walk(+b: Bin.Bytes, n: Nat, +at: U32, +index: U32) -> U32:
  match n:
    case 0n: 0
    case 1n+d:
      +start = ttf.u16(b, at)
      +end = ttf.u16(b, (at + 2 : U32))
      +first = ttf.u16(b, (at + 4 : U32))
      U.branch(U32, U32.is_ge(index, first) && U32.is_le((index - first : U32), (end - start : U32)), _ => (start + index - first : U32), _ => ttf.coverage.walk(b, d, (at + 6 : U32), index))

Uses (10):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.and
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.add
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.is_ge
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.is_le
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.sub
  https://jend.leeeet.dev/definition.txt?path=gralha-bytes@0.1.0.1/bytes.bend&name=Bytes
  https://jend.leeeet.dev/definition.txt?path=gralha-text-scan@0.1.0.1/scan.bend&name=branch
  https://jend.leeeet.dev/definition.txt?path=gralha-truetype@0.1.0.1/font.bend&name=ttf.u16