// look ahead for ] - if the array is empty.
	if c = d.skipSpaces(); c == ']' {
		goto out
	}

scan:
	if v, err = d.emitAny(); err != nil {
		goto out
	}

	if d.depth > d.emitDepth { // skip alloc for array if it won't be emitted
		array = append(array, v)
	}

	// next token must be ',' or ']'
	switch c = d.skipSpaces(); c {
	case ',':
		d.skipSpaces()
		goto scan
	case ']':

            return;
        }

        Class<?> clazz = node.getClass();
        while (clazz != null && !clazz.equals(Object.class)) {
            for (Field field : clazz.getDeclaredFields()) {
                // Skip static fields and synthetic fields
                if (Modifier.isStatic(field.getModifiers()) || field.isSynthetic()) {
                    continue;
                }

                try {

		if strings.HasPrefix(baseDir, dirPath) {
			return nil
		}
	}

	// Slow path: make sure parent exists and then call Mkdir for path.
	i := len(dirPath)
	for i > 0 && os.IsPathSeparator(dirPath[i-1]) { // Skip trailing path separator.
		i--
	}

	j := i
	for j > 0 && !os.IsPathSeparator(dirPath[j-1]) { // Scan backward over element.
		j--
	}

	if j > 1 {
		// Create parent.

)

var (
	smallInput  = make([]byte, 1024*12)       // 12K
	mediumInput = make([]byte, 1024*1024*12)  // 12MB
	largeInput  = make([]byte, 1024*1024*128) // 128MB
)

func TestScanner(t *testing.T) {
	t.Skip("Unstable test")
	data := []byte("abcdefghijklmnopqrstuvwxyz0123456789")

	var i int
	r := bytes.NewReader(data)
	scanner := newScanner(r)
	for scanner.pos < atomic.LoadInt64(&scanner.end) {
		c := scanner.next()

		buf.Next(test.skip)
		bytes, err := buf.Peek(test.n)
		if string(bytes) != test.expected {
			t.Errorf("expected %q, got %q", test.expected, bytes)
		}
		if err != test.err {
			t.Errorf("expected error %v, got %v", test.err, err)
		}
		if buf.Len() != len(test.buffer)-test.skip {
			t.Errorf("bad length after peek: %d, want %d", buf.Len(), len(test.buffer)-test.skip)
		}
	}
}

	if err != nil {
		return nil, err
	}
	return bytes.TrimSpace(out), nil
}

func getLines(cmd *exec.Cmd) [][]byte {
	out := output(cmd)
	lines := bytes.Split(out, []byte("\n"))
	// Skip the empty line at the end.
	if len(lines[len(lines)-1]) == 0 {
		lines = lines[:len(lines)-1]
	}
	return lines
}

func output(cmd *exec.Cmd) []byte {
	out, err := cmd.Output()
	if err != nil {

func NewTokenizer(name string, r io.Reader, file *os.File) *Tokenizer {
	var s scanner.Scanner
	s.Init(r)
	// Newline is like a semicolon; other space characters are fine.
	s.Whitespace = 1<<'\t' | 1<<'\r' | 1<<' '
	// Don't skip comments: we need to count newlines.
	s.Mode = scanner.ScanChars |
		scanner.ScanFloats |
		scanner.ScanIdents |
		scanner.ScanInts |
		scanner.ScanStrings |
		scanner.ScanComments
	s.Position.Filename = name

	// SkipDecommissioned set to 'true' if the call requires skipping the pool being decommissioned.
	// mainly set for certain WRITE operations.
	SkipDecommissioned bool
	// SkipRebalancing should be set to 'true' if the call should skip pools
	// participating in a rebalance operation. Typically set for 'write' operations.
	SkipRebalancing bool

<img src="/img/tutorial/body-fields/image02.png">

## Technical Details { #technical-details }

/// tip

If you are already using **FastAPI** version **0.99.0 or above**, you can probably **skip** these details.

They are more relevant for older versions, before OpenAPI 3.1.0 was available.

You can consider this a brief OpenAPI and JSON Schema **history lesson**. 🤓

///

/// warning

     *
     * @param visitor the visitor to call back, must not be {@code null}
     * @return {@code true} to visit siblings nodes of this node as well, {@code false} to skip siblings
     */
    boolean accept(@Nonnull NodeVisitor visitor);

    /**
     * Returns a new tree starting at this node, filtering the children.
     * Note that this node will not be filtered and only the children