Jpeg.jpeg.progressive.first.symbol: def of gralha-jpeg-decode@0.1.0.1
Import: import gralha-jpeg-decode@0.1.0.1/jpeg.bend as Jpeg
Lines 277-290 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=277&end_line=290

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.first.symbol(read: JPEGRead, +index: U32, +end: U32, +offset: U32, +low: U32, +coefficients: Bin.Bytes, +predictor: U32) -> JPEGRefined:
  JPEGRead{symbol, stream} = read
  +rs = symbol
  +input = stream
  +run = (rs / 16 : U32)
  +count = (rs % 16 : U32)
  +eob = U32.is_eq(count, 0) && U32.is_lt(run, 15)
  +zero = U32.is_eq(rs, 240)
  +pos = (index + run : U32)
  +ok = jpeg.stream.valid(input) && (eob || (zero && U32.is_le(pos, end)) || (U32.is_gt(count, 0) && U32.is_le(count, 10) && U32.is_le(pos, end)))
  JPEGRefined{U.choose(U32, eob || Bool.not(ok), U32.inc(end), U32.inc(pos)),
    U.branch(JPEGBlock, Bool.not(ok), _ => JPEGBlock{jpeg.stream.invalid(input), coefficients, predictor},
      _ => U.branch(JPEGBlock, eob, _ => jpeg.progressive.eob(jpeg.bits(input, run), run, coefficients, predictor, 1),
        _ => U.branch(JPEGBlock, zero, _ => JPEGBlock{input, coefficients, predictor}, _ => jpeg.progressive.ac.bits(jpeg.bits(input, count), count, coefficients, predictor, offset, pos, low))))}

Uses (23):
  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.div
  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.is_le
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.is_lt
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.mod
  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-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=JPEGRead
  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.progressive.ac.bits
  https://jend.leeeet.dev/definition.txt?path=gralha-jpeg-decode@0.1.0.1/jpeg.bend&name=jpeg.progressive.eob
  https://jend.leeeet.dev/definition.txt?path=gralha-jpeg-decode@0.1.0.1/jpeg.bend&name=jpeg.stream.invalid
  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-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