Jpeg.jpeg.progressive.walk: def of gralha-jpeg-decode@0.1.0.1
Import: import gralha-jpeg-decode@0.1.0.1/jpeg.bend as Jpeg
Lines 313-322 of gralha-jpeg-decode@0.1.0.1/jpeg.bend: https://jend.leeeet.dev/read.txt?path=gralha-jpeg-decode@0.1.0.1/jpeg.bend&start_line=313&end_line=322

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 jpeg.progressive.walk(+index: U32, +end: U32, +run: U32, +fresh: U32, +offset: U32, +p1: U32, +block: JPEGBlock) -> JPEGRefined:
  JPEGBlock{stream, coefficients, predictor} = block
  +at = (offset + jpeg.zigzag(index) : U32)
  +nonzero = Bool.not(U32.is_eq(Bin.bytes.get(coefficients, at), 0))
  +done = U32.is_gt(index, end) || (U32.is_eq(run, 0) && U32.is_eq(fresh, 0)) || Bool.not(jpeg.stream.valid(stream))
  U.branch(JPEGRefined, done, _ => JPEGRefined{index, U.choose(JPEGBlock, U32.is_gt(index, end) && Bool.not(U32.is_eq(fresh, 0)), jpeg.block.invalid(block), block)},
    _ => U.branch(JPEGRefined, nonzero,
      _ => jpeg.progressive.walk(U32.inc(index), end, run, fresh, offset, p1, jpeg.progressive.refine.bit(jpeg.bits(stream, 1), coefficients, predictor, at, p1)),
      _ => U.branch(JPEGRefined, U32.is_gt(run, 0), _ => jpeg.progressive.walk(U32.inc(index), end, (run - 1 : U32), fresh, offset, p1, block),
        _ => JPEGRefined{U32.inc(index), JPEGBlock{stream, Bin.bytes.set(coefficients, at, fresh), predictor}})))

Uses (20):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.and
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.not
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.or
  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.inc
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.is_eq
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.is_gt
  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.get
  https://jend.leeeet.dev/definition.txt?path=gralha-bytes@0.1.0.1/bytes.bend&name=bytes.set
  https://jend.leeeet.dev/definition.txt?path=gralha-jpeg-decode@0.1.0.1/jpeg.bend&name=JPEGBlock
  https://jend.leeeet.dev/definition.txt?path=gralha-jpeg-decode@0.1.0.1/jpeg.bend&name=JPEGRefined
  https://jend.leeeet.dev/definition.txt?path=gralha-jpeg-decode@0.1.0.1/jpeg.bend&name=jpeg.bits
  https://jend.leeeet.dev/definition.txt?path=gralha-jpeg-decode@0.1.0.1/jpeg.bend&name=jpeg.block.invalid
  https://jend.leeeet.dev/definition.txt?path=gralha-jpeg-decode@0.1.0.1/jpeg.bend&name=jpeg.progressive.refine.bit
  https://jend.leeeet.dev/definition.txt?path=gralha-jpeg-decode@0.1.0.1/jpeg.bend&name=jpeg.stream.valid
  https://jend.leeeet.dev/definition.txt?path=gralha-jpeg-decode@0.1.0.1/jpeg.bend&name=jpeg.zigzag
  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-text-scan@0.1.0.1/scan.bend&name=choose