func genPathData()

in shiny/materialdesign/icons/gen.go [465:554]
85 lines of code
33 McCabe index (conditional complexity)

func genPathData(enc *iconvg.Encoder, adj uint8, pathData string, size float32, offset f32.Vec2) error {
	if strings.HasSuffix(pathData, "z") {
		pathData = pathData[:len(pathData)-1]
	}
	r := strings.NewReader(pathData)

	var args [6]float32
	op, relative, started := byte(0), false, false
	for {
		b, err := r.ReadByte()
		if err == io.EOF {
			break
		}
		if err != nil {
			return err
		}

		switch {
		case b == ' ':
			continue
		case 'A' <= b && b <= 'Z':
			op, relative = b, false
		case 'a' <= b && b <= 'z':
			op, relative = b, true
		default:
			r.UnreadByte()
		}

		n := 0
		switch op {
		case 'L', 'l', 'T', 't':
			n = 2
		case 'Q', 'q', 'S', 's':
			n = 4
		case 'C', 'c':
			n = 6
		case 'H', 'h', 'V', 'v':
			n = 1
		case 'M', 'm':
			n = 2
		case 'Z', 'z':
		default:
			return fmt.Errorf("unknown opcode %c\n", b)
		}

		scan(&args, r, n)
		normalize(&args, n, op, size, offset, relative)

		switch op {
		case 'L':
			enc.AbsLineTo(args[0], args[1])
		case 'l':
			enc.RelLineTo(args[0], args[1])
		case 'T':
			enc.AbsSmoothQuadTo(args[0], args[1])
		case 't':
			enc.RelSmoothQuadTo(args[0], args[1])
		case 'Q':
			enc.AbsQuadTo(args[0], args[1], args[2], args[3])
		case 'q':
			enc.RelQuadTo(args[0], args[1], args[2], args[3])
		case 'S':
			enc.AbsSmoothCubeTo(args[0], args[1], args[2], args[3])
		case 's':
			enc.RelSmoothCubeTo(args[0], args[1], args[2], args[3])
		case 'C':
			enc.AbsCubeTo(args[0], args[1], args[2], args[3], args[4], args[5])
		case 'c':
			enc.RelCubeTo(args[0], args[1], args[2], args[3], args[4], args[5])
		case 'H':
			enc.AbsHLineTo(args[0])
		case 'h':
			enc.RelHLineTo(args[0])
		case 'V':
			enc.AbsVLineTo(args[0])
		case 'v':
			enc.RelVLineTo(args[0])
		case 'M':
			if !started {
				started = true
				enc.StartPath(adj, args[0], args[1])
			} else {
				enc.ClosePathAbsMoveTo(args[0], args[1])
			}
		case 'm':
			enc.ClosePathRelMoveTo(args[0], args[1])
		}
	}
	return nil
}