package jwt

// This file is a re-implementation of the original code here with some
// additional allocation tweaks reproduced using GODEBUG=allocfreetrace=1
// original file https://github.com/golang-jwt/jwt/blob/main/parser.go
// borrowed under MIT License https://github.com/golang-jwt/jwt/blob/main/LICENSE

import (
	"bytes"
	"crypto"
	"crypto/hmac"
	"encoding/base64"
	"errors"
	"fmt"
	"hash"
	"sync"
	"time"

	"hostname",     // a valid representation for an Internet host name, as defined by RFC 1034, section 3.1 [RFC1034].
	"ipv4",         // an IPv4 IP as parsed by Golang net.ParseIP
	"ipv6",         // an IPv6 IP as parsed by Golang net.ParseIP
	"cidr",         // a CIDR as parsed by Golang net.ParseCIDR
	"mac",          // a MAC address as parsed by Golang net.ParseMAC

	lastGs map[int32]uint64
	lastP  int32
}

func (p *parser) discard(n uint64) bool {
	if n > math.MaxInt {
		return false
	}
	if noff := p.off + int(n); noff < p.off || noff > len(p.data) {
		return false
	} else {
		p.off = noff
	}
	return true
}

func newParser(r io.Reader, ver version.Version) (*parser, error) {
	var buf []byte
	if seeker, ok := r.(io.Seeker); ok {

	// true
	// false
	// true
	// false
}

func ExampleIP_IsMulticast() {
	ipv6Multi := net.ParseIP("FF00::")
	ipv6LinkLocalMulti := net.ParseIP("ff02::1")
	ipv6Lo := net.ParseIP("::1")
	ipv4Multi := net.ParseIP("239.0.0.0")
	ipv4LinkLocalMulti := net.ParseIP("224.0.0.0")
	ipv4Lo := net.ParseIP("127.0.0.0")

	fmt.Println(ipv6Multi.IsMulticast())
	fmt.Println(ipv6LinkLocalMulti.IsMulticast())

// and clears them from the parser state.
func (p *parser) takePragma() Pragma {
	prag := p.pragma
	p.pragma = nil
	return prag
}

// clearPragma is called at the end of a statement or
// other Go form that does NOT accept a pragma.
// It sends the pragma back to the pragma handler
// to be reported as unused.
func (p *parser) clearPragma() {
	if p.pragma != nil {

Sergey Igushkin <******@****.***> 1712225595 +0400

Carlos Amedee <******@****.***> 1715110630 -0400

}

// FuncExpr represents a function call
type FuncExpr struct {
	SFunc     *SimpleArgFunc `parser:"  @@"`
	Count     *CountFunc     `parser:"| @@"`
	Cast      *CastFunc      `parser:"| @@"`
	Substring *SubstringFunc `parser:"| @@"`
	Extract   *ExtractFunc   `parser:"| @@"`
	Trim      *TrimFunc      `parser:"| @@"`
	DateAdd   *DateAddFunc   `parser:"| @@"`
	DateDiff  *DateDiffFunc  `parser:"| @@"`

			},
			want: []IPAddr{
				{IP: ParseIP("fe80::1")},
				{IP: ParseIP("2001:db8:1::1")},
			},
			reverse: true,
		},

		// Issue 13283.  Having a 10/8 source address does not
		// mean we should prefer 23/8 destination addresses.
		{
			in: []IPAddr{
				{IP: ParseIP("54.83.193.112")},
				{IP: ParseIP("184.72.238.214")},
				{IP: ParseIP("23.23.172.185")},
				{IP: ParseIP("75.101.148.21")},

	// we are sure we don't change the errors that go/parser returns.
	if r.err == errSyntax {
		r.err = nil
		for r.err == nil && !r.eof {
			r.readByte()
		}
		info.header = r.buf
	}
	if r.err != nil {
		return r.err
	}

	if info.fset == nil {
		return nil
	}

	// Parse file header & record imports.