You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: format.go
    path of file: ./repos/docker-ce/components/cli/vendor/github.com/davecgh/go-spew/spew
    
    the code of the file until where you have to start completion: /*
 * Copyright (c) 2013-2016 Dave Collins <dave@davec.name>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

package spew

import (
	"bytes"
	"fmt"
	"reflect"
	"strconv"
	"strings"
)

// supportedFlags is a list of all the character flags supported by fmt package.
const supportedFlags = "0-+# "

// formatState implements the fmt.Formatter interface and contains information
// about the state of a formatting operation.  The NewFormatter function can
// be used to get a new Formatter which can be used directly as arguments
// in standard fmt package printing calls.
type formatState struct {
	value          interface{}
	fs             fmt.State
	depth          int
	pointers       map[uintptr]int
	ignoreNextType bool
	cs             *ConfigState
}

// buildDefaultFormat recreates the original format string without precision
// and width information to pass in to fmt.Sprintf in the case of an
// unrecognized type.  Unless new types are added to the language, this
// function won't ever be called.
func (f *formatState) buildDefaultFormat() (format string) {
	buf := bytes.NewBuffer(percentBytes)

	for _, flag := range supportedFlags {
		if f.fs.Flag(int(flag)) {
			buf.WriteRune(flag)
		}
	}

	buf.WriteRune('v')

	format = buf.String()
	return format
}

// constructOrigFormat recreates the original format
    
func (f *formatState) formatPtr(v reflect.Value) {
	// Display nil if top level pointer is nil.
	showTypes := f.fs.Flag('#')
	if v.IsNil() && (!showTypes || f.ignoreNextType) {
		f.fs.Write(nilAngleBytes)
		return
	}

	// Remove pointers at or below the current depth from map used to detect
	// circular refs.
	for k, depth := range f.pointers {
		if depth >= f.depth {
			delete(f.pointers, k)
		}
	}

	// Keep list of all dereferenced pointers to possibly show later.
	pointerChain := make([]uintptr, 0)

	// Figure out how many levels of indirection there are by derferencing
	// pointers and unpacking interfaces down the chain while detecting circular
	// references.
	nilFound := false
	cycleFound := false
	indirects := 0
	ve := v
	for ve.Kind() == reflect.Ptr {
		if ve.IsNil() {
			nilFound = true
			break
		}
		indirects++
		addr := ve.Pointer()
		pointerChain = append(pointerChain, addr)
		if pd, ok := f.pointers[addr]; ok && pd < f.depth {
			cycleFound = true
			indirects--
			break
		}
		f.pointers[addr] = f.depth

		ve = ve.Elem()
		if ve.Kind() == reflect.Interface {
			if ve.IsNil() {
				nilFound = true
				break
			}
			ve = ve.Elem()
		}
	}

	// Display type or indirection level depending on flags.
	if showTypes && !f.ignoreNextType {
		f.fs.Write(openParenBytes)
		f.fs.Write(bytes.Repeat(asteriskBytes, indirects))
		f.fs.Write([]byte(ve.Type().String()))
		f.fs.Write(closeParenBytes)
	} else {
		if nilFound || cycleFound {
			indirects += strings.Count(ve.Type().String(), "*")
		}
		f.fs.Write(openAngleBytes)
		f.fs.Write([]byte(strings.Repeat("*", indirects)))
		f.fs.Write(closeAngleBytes)
	}

	// Display pointer information depending on flags.
	if f.fs.Flag('+') && (len(pointerChain) > 0) {
		f.fs.Write(openParenBytes)
		for i, addr := range pointerChain {
			if i > 0 {
				f.fs.Write(pointerChainBytes)
			}
			printHexPtr(f.fs, addr)
		}
		f.fs.Write(closeParenBytes)
	}

	// Display dereferenced value.
	switch {
	case nilFound:
		f.fs.Write(nilAngleBytes)

	case cycleFound:
		f.fs.Write(circularShortBytes)

	default:
		f.ignoreNextType = true
		f.format(ve)
	}
}