// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package xml

import (
	"bytes"
	"errors"
	"io"
	"reflect"
	"runtime"
	"strings"
	"testing"
	"time"
)

// Stripped down Atom feed data structures.

func TestUnmarshalFeed(t *testing.T) {
	var f Feed
	if err := Unmarshal([]byte(atomFeedString), &f); err != nil {
		t.Fatalf("Unmarshal: %s", err)
	}
	if !reflect.DeepEqual(f, atomFeed) {
		t.Fatalf("have %#v\nwant %#v", f, atomFeed)
	}
}

// hget http://codereview.appspot.com/rss/mine/rsc
const atomFeedString = `
<?xml version="1.0" encoding="utf-8"?>
<feed xmlns="http://www.w3.org/2005/Atom" xml:lang="en-us" updated="2009-10-04T01:35:58+00:00"><title>Code Review - My issues</title><link href="http://codereview.appspot.com/" rel="alternate"></link><link href="http://codereview.appspot.com/rss/mine/rsc" rel="self"></link><id>http://codereview.appspot.com/</id><author><name>rietveld&lt;&gt;</name></author><entry><title>rietveld: an attempt at pubsubhubbub
</title><link href="http://codereview.appspot.com/126085" rel="alternate"></link><updated>2009-10-04T01:35:58+00:00</updated><author><name>email-address-removed</name></author><id>urn:md5:134d9179c41f806be79b3a5f7877d19a</id><summary type="html">
  An attempt at adding pubsubhubbub support to Rietveld.
http://code.google.com/p/pubsubhubbub
http://code.google.com/p/rietveld/issues/detail?id=155

The server side of the protocol is trivial:
  1. add a &amp;lt;link rel=&amp;quot;hub&amp;quot; href=&amp;quot;hub-server&amp;quot;&amp;gt; tag to all
     feeds that will be pubsubhubbubbed.
  2. every time one of those feeds changes, tell the hub
     with a simple POST request.

I have tested this by adding debug prints to a local hub
server and checking that the server got the right publish
requests.

I can&amp;#39;t quite get the server to work, but I think the bug
is not in my code.  I think that the server expects to be
able to grab the feed and see the feed&amp;#39;s actual URL in
the link rel=&amp;quot;self&amp;quot;, but the default value for that drops
the :port from the URL, and I cannot for the life of me
figure out how to get the Atom generator deep inside
django not to do that, or even where it is doing that,
or even what code is running to generate the Atom feed.
(I thought I knew but I added some assert False statements
and it kept running!)

Ignoring that particular problem, I would appreciate
feedback on the right way to get the two values at
the top of feeds.py marked NOTE(rsc).


</summary></entry><entry><title>rietveld: correct tab handling
</title><link href="http://codereview.appspot.com/124106" rel="alternate"></link><updated>2009-10-03T23:02:17+00:00</updated><author><name>email-address-removed</name></author><id>urn:md5:0a2a4f19bb815101f0ba2904aed7c35a</id><summary type="html">
  This fixes the buggy tab rendering that can be seen at
http://codereview.appspot.com/116075/diff/1/2

The fundamental problem was that the tab code was
not being told what column the text began in, so it
didn&amp;#39;t know where to put the tab stops.  Another problem
was that some of the code assumed that string byte
offsets were the same as column offsets, which is only
true if there are no tabs.

In the process of fixing this, I cleaned up the arguments
to Fold and ExpandTabs and renamed them Break and
_ExpandTabs so that I could be sure that I found all the
call sites.  I also wanted to verify that ExpandTabs was
not being used from outside intra_region_diff.py.


</summary></entry></feed> 	   `

type Feed struct {
	XMLName Name      `xml:"http://www.w3.org/2005/Atom feed"`
	Title   string    `xml:"title"`
	ID      string    `xml:"id"`
	Link    []Link    `xml:"link"`
	Updated time.Time `xml:"updated,attr"`
	Author  Person    `xml:"author"`
	Entry   []Entry   `xml:"entry"`
}

type Entry struct {
	Title   string    `xml:"title"`
	ID      string    `xml:"id"`
	Link    []Link    `xml:"link"`
	Updated time.Time `xml:"updated"`
	Author  Person    `xml:"author"`
	Summary Text      `xml:"summary"`
}

type Link struct {
	Rel  string `xml:"rel,attr,omitempty"`
	Href string `xml:"href,attr"`
}

type Person struct {
	Name     string `xml:"name"`
	URI      string `xml:"uri"`
	Email    string `xml:"email"`
	InnerXML string `xml:",innerxml"`
}

type Text struct {
	Type string `xml:"type,attr,omitempty"`
	Body string `xml:",chardata"`
}

var atomFeed = Feed{
	XMLName: Name{"http://www.w3.org/2005/Atom", "feed"},
	Title:   "Code Review - My issues",
	Link: []Link{
		{Rel: "alternate", Href: "http://codereview.appspot.com/"},
		{Rel: "self", Href: "http://codereview.appspot.com/rss/mine/rsc"},
	},
	ID:      "http://codereview.appspot.com/",
	Updated: ParseTime("2009-10-04T01:35:58+00:00"),
	Author: Person{
		Name:     "rietveld<>",
		InnerXML: "<name>rietveld&lt;&gt;</name>",
	},
	Entry: []Entry{
		{
			Title: "rietveld: an attempt at pubsubhubbub\n",
			Link: []Link{
				{Rel: "alternate", Href: "http://codereview.appspot.com/126085"},
			},
			Updated: ParseTime("2009-10-04T01:35:58+00:00"),
			Author: Person{
				Name:     "email-address-removed",
				InnerXML: "<name>email-address-removed</name>",
			},
			ID: "urn:md5:134d9179c41f806be79b3a5f7877d19a",
			Summary: Text{
				Type: "html",
				Body: `
  An attempt at adding pubsubhubbub support to Rietveld.
http://code.google.com/p/pubsubhubbub
http://code.google.com/p/rietveld/issues/detail?id=155

The server side of the protocol is trivial:
  1. add a &lt;link rel=&quot;hub&quot; href=&quot;hub-server&quot;&gt; tag to all
     feeds that will be pubsubhubbubbed.
  2. every time one of those feeds changes, tell the hub
     with a simple POST request.

I have tested this by adding debug prints to a local hub
server and checking that the server got the right publish
requests.

I can&#39;t quite get the server to work, but I think the bug
is not in my code.  I think that the server expects to be
able to grab the feed and see the feed&#39;s actual URL in
the link rel=&quot;self&quot;, but the default value for that drops
the :port from the URL, and I cannot for the life of me
figure out how to get the Atom generator deep inside
django not to do that, or even where it is doing that,
or even what code is running to generate the Atom feed.
(I thought I knew but I added some assert False statements
and it kept running!)

Ignoring that particular problem, I would appreciate
feedback on the right way to get the two values at
the top of feeds.py marked NOTE(rsc).


`,
			},
		},
		{
			Title: "rietveld: correct tab handling\n",
			Link: []Link{
				{Rel: "alternate", Href: "http://codereview.appspot.com/124106"},
			},
			Updated: ParseTime("2009-10-03T23:02:17+00:00"),
			Author: Person{
				Name:     "email-address-removed",
				InnerXML: "<name>email-address-removed</name>",
			},
			ID: "urn:md5:0a2a4f19bb815101f0ba2904aed7c35a",
			Summary: Text{
				Type: "html",
				Body: `
  This fixes the buggy tab rendering that can be seen at
http://codereview.appspot.com/116075/diff/1/2

The fundamental problem was that the tab code was
not being told what column the text began in, so it
didn&#39;t know where to put the tab stops.  Another problem
was that some of the code assumed that string byte
offsets were the same as column offsets, which is only
true if there are no tabs.

In the process of fixing this, I cleaned up the arguments
to Fold and ExpandTabs and renamed them Break and
_ExpandTabs so that I could be sure that I found all the
call sites.  I also wanted to verify that ExpandTabs was
not being used from outside intra_region_diff.py.


`,
			},
		},
	},
}

const pathTestString = `
<Result>
    <Before>1</Before>
    <Items>
        <Item1>
            <Value>A</Value>
        </Item1>
        <Item2>
            <Value>B</Value>
        </Item2>
        <Item1>
            <Value>C</Value>
            <Value>D</Value>
        </Item1>
        <_>
            <Value>E</Value>
        </_>
    </Items>
    <After>2</After>
</Result>
`

type PathTestItem struct {
	Value string
}

type PathTestA struct {
	Items         []PathTestItem `xml:">Item1"`
	Before, After string
}

type PathTestB struct {
	Other         []PathTestItem `xml:"Items>Item1"`
	Before, After string
}

type PathTestC struct {
	Values1       []string `xml:"Items>Item1>Value"`
	Values2       []string `xml:"Items>Item2>Value"`
	Before, After string
}

type PathTestSet struct {
	Item1 []PathTestItem
}

type PathTestD struct {
	Other         PathTestSet `xml:"Items"`
	Before, After string
}

type PathTestE struct {
	Underline     string `xml:"Items>_>Value"`
	Before, After string
}

var pathTests = []any{
	&PathTestA{Items: []PathTestItem{{"A"}, {"D"}}, Before: "1", After: "2"},
	&PathTestB{Other: []PathTestItem{{"A"}, {"D"}}, Before: "1", After: "2"},
	&PathTestC{Values1: []string{"A", "C", "D"}, Values2: []string{"B"}, Before: "1", After: "2"},
	&PathTestD{Other: PathTestSet{Item1: []PathTestItem{{"A"}, {"D"}}}, Before: "1", After: "2"},
	&PathTestE{Underline: "E", Before: "1", After: "2"},
}

func TestUnmarshalPaths(t *testing.T) {
	for _, pt := range pathTests {
		v := reflect.New(reflect.TypeOf(pt).Elem()).Interface()
		if err := Unmarshal([]byte(pathTestString), v); err != nil {
			t.Fatalf("Unmarshal: %s", err)
		}
		if !reflect.DeepEqual(v, pt) {
			t.Fatalf("have %#v\nwant %#v", v, pt)
		}
	}
}

type BadPathTestA struct {
	First  string `xml:"items>item1"`
	Other  string `xml:"items>item2"`
	Second string `xml:"items"`
}

type BadPathTestB struct {
	Other  string `xml:"items>item2>value"`
	First  string `xml:"items>item1"`
	Second string `xml:"items>item1>value"`
}

type BadPathTestC struct {
	First  string
	Second string `xml:"First"`
}

type BadPathTestD struct {
	BadPathEmbeddedA
	BadPathEmbeddedB
}

type BadPathEmbeddedA struct {
	First string
}

type BadPathEmbeddedB struct {
	Second string `xml:"First"`
}

var badPathTests = []struct {
	v, e any
}{
	{&BadPathTestA{}, &TagPathError{reflect.TypeOf(BadPathTestA{}), "First", "items>item1", "Second", "items"}},
	{&BadPathTestB{}, &TagPathError{reflect.TypeOf(BadPathTestB{}), "First", "items>item1", "Second", "items>item1>value"}},
	{&BadPathTestC{}, &TagPathError{reflect.TypeOf(BadPathTestC{}), "First", "", "Second", "First"}},
	{&BadPathTestD{}, &TagPathError{reflect.TypeOf(BadPathTestD{}), "First", "", "Second", "First"}},
}

func TestUnmarshalBadPaths(t *testing.T) {
	for _, tt := range badPathTests {
		err := Unmarshal([]byte(pathTestString), tt.v)
		if !reflect.DeepEqual(err, tt.e) {
			t.Fatalf("Unmarshal with %#v didn't fail properly:\nhave %#v,\nwant %#v", tt.v, err, tt.e)
		}
	}
}

const OK = "OK"
const withoutNameTypeData = `
<?xml version="1.0" charset="utf-8"?>
<Test3 Attr="OK" />`

type TestThree struct {
	XMLName Name   `xml:"Test3"`
	Attr    string `xml:",attr"`
}

func TestUnmarshalWithoutNameType(t *testing.T) {
	var x TestThree
	if err := Unmarshal([]byte(withoutNameTypeData), &x); err != nil {
		t.Fatalf("Unmarshal: %s", err)
	}
	if x.Attr != OK {
		t.Fatalf("have %v\nwant %v", x.Attr, OK)
	}
}

func TestUnmarshalAttr(t *testing.T) {
	type ParamVal struct {
		Int int `xml:"int,attr"`
	}

	type ParamPtr struct {
		Int *int `xml:"int,attr"`
	}

	type ParamStringPtr struct {
		Int *string `xml:"int,attr"`
	}

	x := []byte(`<Param int="1" />`)

	p1 := &ParamPtr{}
	if err := Unmarshal(x, p1); err != nil {
		t.Fatalf("Unmarshal: %s", err)
	}
	if p1.Int == nil {
		t.Fatalf("Unmarshal failed in to *int field")
	} else if *p1.Int != 1 {
		t.Fatalf("Unmarshal with %s failed:\nhave %#v,\n want %#v", x, p1.Int, 1)
	}

	p2 := &ParamVal{}
	if err := Unmarshal(x, p2); err != nil {
		t.Fatalf("Unmarshal: %s", err)
	}
	if p2.Int != 1 {
		t.Fatalf("Unmarshal with %s failed:\nhave %#v,\n want %#v", x, p2.Int, 1)
	}

	p3 := &ParamStringPtr{}
	if err := Unmarshal(x, p3); err != nil {
		t.Fatalf("Unmarshal: %s", err)
	}
	if p3.Int == nil {
		t.Fatalf("Unmarshal failed in to *string field")
	} else if *p3.Int != "1" {
		t.Fatalf("Unmarshal with %s failed:\nhave %#v,\n want %#v", x, p3.Int, 1)
	}
}

type Tables struct {
	HTable string `xml:"http://www.w3.org/TR/html4/ table"`
	FTable string `xml:"http://www.w3schools.com/furniture table"`
}

var tables = []struct {
	xml string
	tab Tables
	ns  string
}{
	{
		xml: `<Tables>` +
			`<table xmlns="http://www.w3.org/TR/html4/">hello</table>` +
			`<table xmlns="http://www.w3schools.com/furniture">world</table>` +
			`</Tables>`,
		tab: Tables{"hello", "world"},
	},
	{
		xml: `<Tables>` +
			`<table xmlns="http://www.w3schools.com/furniture">world</table>` +
			`<table xmlns="http://www.w3.org/TR/html4/">hello</table>` +
			`</Tables>`,
		tab: Tables{"hello", "world"},
	},
	{
		xml: `<Tables xmlns:f="http://www.w3schools.com/furniture" xmlns:h="http://www.w3.org/TR/html4/">` +
			`<f:table>world</f:table>` +
			`<h:table>hello</h:table>` +
			`</Tables>`,
		tab: Tables{"hello", "world"},
	},
	{
		xml: `<Tables>` +
			`<table>bogus</table>` +
			`</Tables>`,
		tab: Tables{},
	},
	{
		xml: `<Tables>` +
			`<table>only</table>` +
			`</Tables>`,
		tab: Tables{HTable: "only"},
		ns:  "http://www.w3.org/TR/html4/",
	},
	{
		xml: `<Tables>` +
			`<table>only</table>` +
			`</Tables>`,
		tab: Tables{FTable: "only"},
		ns:  "http://www.w3schools.com/furniture",
	},
	{
		xml: `<Tables>` +
			`<table>only</table>` +
			`</Tables>`,
		tab: Tables{},
		ns:  "something else entirely",
	},
}

func TestUnmarshalNS(t *testing.T) {
	for i, tt := range tables {
		var dst Tables
		var err error
		if tt.ns != "" {
			d := NewDecoder(strings.NewReader(tt.xml))
			d.DefaultSpace = tt.ns
			err = d.Decode(&dst)
		} else {
			err = Unmarshal([]byte(tt.xml), &dst)
		}
		if err != nil {
			t.Errorf("#%d: Unmarshal: %v", i, err)
			continue
		}
		want := tt.tab
		if dst != want {
			t.Errorf("#%d: dst=%+v, want %+v", i, dst, want)
		}
	}
}

func TestMarshalNS(t *testing.T) {
	dst := Tables{"hello", "world"}
	data, err := Marshal(&dst)
	if err != nil {
		t.Fatalf("Marshal: %v", err)
	}
	want := `<Tables><table xmlns="http://www.w3.org/TR/html4/">hello</table><table xmlns="http://www.w3schools.com/furniture">world</table></Tables>`
	str := string(data)
	if str != want {
		t.Errorf("have: %q\nwant: %q\n", str, want)
	}
}

type TableAttrs struct {
	TAttr TAttr
}

type TAttr struct {
	HTable string `xml:"http://www.w3.org/TR/html4/ table,attr"`
	FTable string `xml:"http://www.w3schools.com/furniture table,attr"`
	Lang   string `xml:"http://www.w3.org/XML/1998/namespace lang,attr,omitempty"`
	Other1 string `xml:"http://golang.org/xml/ other,attr,omitempty"`
	Other2 string `xml:"http://golang.org/xmlfoo/ other,attr,omitempty"`
	Other3 string `xml:"http://golang.org/json/ other,attr,omitempty"`
	Other4 string `xml:"http://golang.org/2/json/ other,attr,omitempty"`
}

var tableAttrs = []struct {
	xml string
	tab TableAttrs
	ns  string
}{
	{
		xml: `<TableAttrs xmlns:f="http://www.w3schools.com/furniture" xmlns:h="http://www.w3.org/TR/html4/"><TAttr ` +
			`h:table="hello" f:table="world" ` +
			`/></TableAttrs>`,
		tab: TableAttrs{TAttr{HTable: "hello", FTable: "world"}},
	},
	{
		xml: `<TableAttrs><TAttr xmlns:f="http://www.w3schools.com/furniture" xmlns:h="http://www.w3.org/TR/html4/" ` +
			`h:table="hello" f:table="world" ` +
			`/></TableAttrs>`,
		tab: TableAttrs{TAttr{HTable: "hello", FTable: "world"}},
	},
	{
		xml: `<TableAttrs><TAttr ` +
			`h:table="hello" f:table="world" xmlns:f="http://www.w3schools.com/furniture" xmlns:h="http://www.w3.org/TR/html4/" ` +
			`/></TableAttrs>`,
		tab: TableAttrs{TAttr{HTable: "hello", FTable: "world"}},
	},
	{
		// Default space does not apply to attribute names.
		xml: `<TableAttrs xmlns="http://www.w3schools.com/furniture" xmlns:h="http://www.w3.org/TR/html4/"><TAttr ` +
			`h:table="hello" table="world" ` +
			`/></TableAttrs>`,
		tab: TableAttrs{TAttr{HTable: "hello", FTable: ""}},
	},
	{
		// Default space does not apply to attribute names.
		xml: `<TableAttrs xmlns:f="http://www.w3schools.com/furniture"><TAttr xmlns="http://www.w3.org/TR/html4/" ` +
			`table="hello" f:table="world" ` +
			`/></TableAttrs>`,
		tab: TableAttrs{TAttr{HTable: "", FTable: "world"}},
	},
	{
		xml: `<TableAttrs><TAttr ` +
			`table="bogus" ` +
			`/></TableAttrs>`,
		tab: TableAttrs{},
	},
	{
		// Default space does not apply to attribute names.
		xml: `<TableAttrs xmlns:h="http://www.w3.org/TR/html4/"><TAttr ` +
			`h:table="hello" table="world" ` +
			`/></TableAttrs>`,
		tab: TableAttrs{TAttr{HTable: "hello", FTable: ""}},
		ns:  "http://www.w3schools.com/furniture",
	},
	{
		// Default space does not apply to attribute names.
		xml: `<TableAttrs xmlns:f="http://www.w3schools.com/furniture"><TAttr ` +
			`table="hello" f:table="world" ` +
			`/></TableAttrs>`,
		tab: TableAttrs{TAttr{HTable: "", FTable: "world"}},
		ns:  "http://www.w3.org/TR/html4/",
	},
	{
		xml: `<TableAttrs><TAttr ` +
			`table="bogus" ` +
			`/></TableAttrs>`,
		tab: TableAttrs{},
		ns:  "something else entirely",
	},
}

func TestUnmarshalNSAttr(t *testing.T) {
	for i, tt := range tableAttrs {
		var dst TableAttrs
		var err error
		if tt.ns != "" {
			d := NewDecoder(strings.NewReader(tt.xml))
			d.DefaultSpace = tt.ns
			err = d.Decode(&dst)
		} else {
			err = Unmarshal([]byte(tt.xml), &dst)
		}
		if err != nil {
			t.Errorf("#%d: Unmarshal: %v", i, err)
			continue
		}
		want := tt.tab
		if dst != want {
			t.Errorf("#%d: dst=%+v, want %+v", i, dst, want)
		}
	}
}

func TestMarshalNSAttr(t *testing.T) {
	src := TableAttrs{TAttr{"hello", "world", "en_US", "other1", "other2", "other3", "other4"}}
	data, err := Marshal(&src)
	if err != nil {
		t.Fatalf("Marshal: %v", err)
	}
	want := `<TableAttrs><TAttr xmlns:html4="http://www.w3.org/TR/html4/" html4:table="hello" xmlns:furniture="http://www.w3schools.com/furniture" furniture:table="world" xml:lang="en_US" xmlns:_xml="http://golang.org/xml/" _xml:other="other1" xmlns:_xmlfoo="http://golang.org/xmlfoo/" _xmlfoo:other="other2" xmlns:json="http://golang.org/json/" json:other="other3" xmlns:json_1="http://golang.org/2/json/" json_1:other="other4"></TAttr></TableAttrs>`
	str := string(data)
	if str != want {
		t.Errorf("Marshal:\nhave: %#q\nwant: %#q\n", str, want)
	}

	var dst TableAttrs
	if err := Unmarshal(data, &dst); err != nil {
		t.Errorf("Unmarshal: %v", err)
	}

	if dst != src {
		t.Errorf("Unmarshal = %q, want %q", dst, src)
	}
}

type MyCharData struct {
	body string
}

func (m *MyCharData) UnmarshalXML(d *Decoder, start StartElement) error {
	for {
		t, err := d.Token()
		if err == io.EOF { // found end of element
			break
		}
		if err != nil {
			return err
		}
		if char, ok := t.(CharData); ok {
			m.body += string(char)
		}
	}
	return nil
}

var _ Unmarshaler = (*MyCharData)(nil)

func (m *MyCharData) UnmarshalXMLAttr(attr Attr) error {
	panic("must not call")
}

type MyAttr struct {
	attr string
}

func (m *MyAttr) UnmarshalXMLAttr(attr Attr) error {
	m.attr = attr.Value
	return nil
}

var _ UnmarshalerAttr = (*MyAttr)(nil)

type MyStruct struct {
	Data *MyCharData
	Attr *MyAttr `xml:",attr"`

	Data2 MyCharData
	Attr2 MyAttr `xml:",attr"`
}

func TestUnmarshaler(t *testing.T) {
	xml := `<?xml version="1.0" encoding="utf-8"?>
		<MyStruct Attr="attr1" Attr2="attr2">
		<Data>hello <!-- comment -->world</Data>
		<Data2>howdy <!-- comment -->world</Data2>
		</MyStruct>
	`

	var m MyStruct
	if err := Unmarshal([]byte(xml), &m); err != nil {
		t.Fatal(err)
	}

	if m.Data == nil || m.Attr == nil || m.Data.body != "hello world" || m.Attr.attr != "attr1" || m.Data2.body != "howdy world" || m.Attr2.attr != "attr2" {
		t.Errorf("m=%#+v\n", m)
	}
}

type Pea struct {
	Cotelydon string
}

type Pod struct {
	Pea any `xml:"Pea"`
}

// https://golang.org/issue/6836
func TestUnmarshalIntoInterface(t *testing.T) {
	pod := new(Pod)
	pod.Pea = new(Pea)
	xml := `<Pod><Pea><Cotelydon>Green stuff</Cotelydon></Pea></Pod>`
	err := Unmarshal([]byte(xml), pod)
	if err != nil {
		t.Fatalf("failed to unmarshal %q: %v", xml, err)
	}
	pea, ok := pod.Pea.(*Pea)
	if !ok {
		t.Fatalf("unmarshaled into wrong type: have %T want *Pea", pod.Pea)
	}
	have, want := pea.Cotelydon, "Green stuff"
	if have != want {
		t.Errorf("failed to unmarshal into interface, have %q want %q", have, want)
	}
}

type X struct {
	D string `xml:",comment"`
}

// Issue 11112. Unmarshal must reject invalid comments.
func TestMalformedComment(t *testing.T) {
	testData := []string{
		"<X><!-- a---></X>",
		"<X><!-- -- --></X>",
		"<X><!-- a--b --></X>",
		"<X><!------></X>",
	}
	for i, test := range testData {
		data := []byte(test)
		v := new(X)
		if err := Unmarshal(data, v); err == nil {
			t.Errorf("%d: unmarshal should reject invalid comments", i)
		}
	}
}

type IXField struct {
	Five        int      `xml:"five"`
	NotInnerXML []string `xml:",innerxml"`
}

// Issue 15600. ",innerxml" on a field that can't hold it.
func TestInvalidInnerXMLType(t *testing.T) {
	v := new(IXField)
	if err := Unmarshal([]byte(`<tag><five>5</five><innertag/></tag>`), v); err != nil {
		t.Errorf("Unmarshal failed: got %v", err)
	}
	if v.Five != 5 {
		t.Errorf("Five = %v, want 5", v.Five)
	}
	if v.NotInnerXML != nil {
		t.Errorf("NotInnerXML = %v, want nil", v.NotInnerXML)
	}
}

type Child struct {
	G struct {
		I int
	}
}

type ChildToEmbed struct {
	X bool
}

type Parent struct {
	I        int
	IPtr     *int
	Is       []int
	IPtrs    []*int
	F        float32
	FPtr     *float32
	Fs       []float32
	FPtrs    []*float32
	B        bool
	BPtr     *bool
	Bs       []bool
	BPtrs    []*bool
	Bytes    []byte
	BytesPtr *[]byte
	S        string
	SPtr     *string
	Ss       []string
	SPtrs    []*string
	MyI      MyInt
	Child    Child
	Children []Child
	ChildPtr *Child
	ChildToEmbed
}

const (
	emptyXML = `
<Parent>
    <I></I>
    <IPtr></IPtr>
    <Is></Is>
    <IPtrs></IPtrs>
    <F></F>
    <FPtr></FPtr>
    <Fs></Fs>
    <FPtrs></FPtrs>
    <B></B>
    <BPtr></BPtr>
    <Bs></Bs>
    <BPtrs></BPtrs>
    <Bytes></Bytes>
    <BytesPtr></BytesPtr>
    <S></S>
    <SPtr></SPtr>
    <Ss></Ss>
    <SPtrs></SPtrs>
    <MyI></MyI>
    <Child></Child>
    <Children></Children>
    <ChildPtr></ChildPtr>
    <X></X>
</Parent>
`
)

// golang.org/issues/13417
func TestUnmarshalEmptyValues(t *testing.T) {
	// Test first with a zero-valued dst.
	v := new(Parent)
	if err := Unmarshal([]byte(emptyXML), v); err != nil {
		t.Fatalf("zero: Unmarshal failed: got %v", err)
	}

	zBytes, zInt, zStr, zFloat, zBool := []byte{}, 0, "", float32(0), false
	want := &Parent{
		IPtr:         &zInt,
		Is:           []int{zInt},
		IPtrs:        []*int{&zInt},
		FPtr:         &zFloat,
		Fs:           []float32{zFloat},
		FPtrs:        []*float32{&zFloat},
		BPtr:         &zBool,
		Bs:           []bool{zBool},
		BPtrs:        []*bool{&zBool},
		Bytes:        []byte{},
		BytesPtr:     &zBytes,
		SPtr:         &zStr,
		Ss:           []string{zStr},
		SPtrs:        []*string{&zStr},
		Children:     []Child{{}},
		ChildPtr:     new(Child),
		ChildToEmbed: ChildToEmbed{},
	}
	if !reflect.DeepEqual(v, want) {
		t.Fatalf("zero: Unmarshal:\nhave:  %#+v\nwant: %#+v", v, want)
	}

	// Test with a pre-populated dst.
	// Multiple addressable copies, as pointer-to fields will replace value during unmarshal.
	vBytes0, vInt0, vStr0, vFloat0, vBool0 := []byte("x"), 1, "x", float32(1), true
	vBytes1, vInt1, vStr1, vFloat1, vBool1 := []byte("x"), 1, "x", float32(1), true
	vInt2, vStr2, vFloat2, vBool2 := 1, "x", float32(1), true
	v = &Parent{
		I:            vInt0,
		IPtr:         &vInt1,
		Is:           []int{vInt0},
		IPtrs:        []*int{&vInt2},
		F:            vFloat0,
		FPtr:         &vFloat1,
		Fs:           []float32{vFloat0},
		FPtrs:        []*float32{&vFloat2},
		B:            vBool0,
		BPtr:         &vBool1,
		Bs:           []bool{vBool0},
		BPtrs:        []*bool{&vBool2},
		Bytes:        vBytes0,
		BytesPtr:     &vBytes1,
		S:            vStr0,
		SPtr:         &vStr1,
		Ss:           []string{vStr0},
		SPtrs:        []*string{&vStr2},
		MyI:          MyInt(vInt0),
		Child:        Child{G: struct{ I int }{I: vInt0}},
		Children:     []Child{{G: struct{ I int }{I: vInt0}}},
		ChildPtr:     &Child{G: struct{ I int }{I: vInt0}},
		ChildToEmbed: ChildToEmbed{X: vBool0},
	}
	if err := Unmarshal([]byte(emptyXML), v); err != nil {
		t.Fatalf("populated: Unmarshal failed: got %v", err)
	}

	want = &Parent{
		IPtr:     &zInt,
		Is:       []int{vInt0, zInt},
		IPtrs:    []*int{&vInt0, &zInt},
		FPtr:     &zFloat,
		Fs:       []float32{vFloat0, zFloat},
		FPtrs:    []*float32{&vFloat0, &zFloat},
		BPtr:     &zBool,
		Bs:       []bool{vBool0, zBool},
		BPtrs:    []*bool{&vBool0, &zBool},
		Bytes:    []byte{},
		BytesPtr: &zBytes,
		SPtr:     &zStr,
		Ss:       []string{vStr0, zStr},
		SPtrs:    []*string{&vStr0, &zStr},
		Child:    Child{G: struct{ I int }{I: vInt0}}, // I should == zInt0? (zero value)
		Children: []Child{{G: struct{ I int }{I: vInt0}}, {}},
		ChildPtr: &Child{G: struct{ I int }{I: vInt0}}, // I should == zInt0? (zero value)
	}
	if !reflect.DeepEqual(v, want) {
		t.Fatalf("populated: Unmarshal:\nhave:  %#+v\nwant: %#+v", v, want)
	}
}

type WhitespaceValuesParent struct {
	BFalse bool
	BTrue  bool
	I      int
	INeg   int
	I8     int8
	I8Neg  int8
	I16    int16
	I16Neg int16
	I32    int32
	I32Neg int32
	I64    int64
	I64Neg int64
	UI     uint
	UI8    uint8
	UI16   uint16
	UI32   uint32
	UI64   uint64
	F32    float32
	F32Neg float32
	F64    float64
	F64Neg float64
}

const whitespaceValuesXML = `
<WhitespaceValuesParent>
    <BFalse>   false   </BFalse>
    <BTrue>   true   </BTrue>
    <I>   266703   </I>
    <INeg>   -266703   </INeg>
    <I8>  112  </I8>
    <I8Neg>  -112  </I8Neg>
    <I16>  6703  </I16>
    <I16Neg>  -6703  </I16Neg>
    <I32>  266703  </I32>
    <I32Neg>  -266703  </I32Neg>
    <I64>  266703  </I64>
    <I64Neg>  -266703  </I64Neg>
    <UI>   266703   </UI>
    <UI8>  112  </UI8>
    <UI16>  6703  </UI16>
    <UI32>  266703  </UI32>
    <UI64>  266703  </UI64>
    <F32>  266.703  </F32>
    <F32Neg>  -266.703  </F32Neg>
    <F64>  266.703  </F64>
    <F64Neg>  -266.703  </F64Neg>
</WhitespaceValuesParent>
`

// golang.org/issues/22146
func TestUnmarshalWhitespaceValues(t *testing.T) {
	v := WhitespaceValuesParent{}
	if err := Unmarshal([]byte(whitespaceValuesXML), &v); err != nil {
		t.Fatalf("whitespace values: Unmarshal failed: got %v", err)
	}

	want := WhitespaceValuesParent{
		BFalse: false,
		BTrue:  true,
		I:      266703,
		INeg:   -266703,
		I8:     112,
		I8Neg:  -112,
		I16:    6703,
		I16Neg: -6703,
		I32:    266703,
		I32Neg: -266703,
		I64:    266703,
		I64Neg: -266703,
		UI:     266703,
		UI8:    112,
		UI16:   6703,
		UI32:   266703,
		UI64:   266703,
		F32:    266.703,
		F32Neg: -266.703,
		F64:    266.703,
		F64Neg: -266.703,
	}
	if v != want {
		t.Fatalf("whitespace values: Unmarshal:\nhave: %#+v\nwant: %#+v", v, want)
	}
}

type WhitespaceAttrsParent struct {
	BFalse bool    `xml:",attr"`
	BTrue  bool    `xml:",attr"`
	I      int     `xml:",attr"`
	INeg   int     `xml:",attr"`
	I8     int8    `xml:",attr"`
	I8Neg  int8    `xml:",attr"`
	I16    int16   `xml:",attr"`
	I16Neg int16   `xml:",attr"`
	I32    int32   `xml:",attr"`
	I32Neg int32   `xml:",attr"`
	I64    int64   `xml:",attr"`
	I64Neg int64   `xml:",attr"`
	UI     uint    `xml:",attr"`
	UI8    uint8   `xml:",attr"`
	UI16   uint16  `xml:",attr"`
	UI32   uint32  `xml:",attr"`
	UI64   uint64  `xml:",attr"`
	F32    float32 `xml:",attr"`
	F32Neg float32 `xml:",attr"`
	F64    float64 `xml:",attr"`
	F64Neg float64 `xml:",attr"`
}

const whitespaceAttrsXML = `
<WhitespaceAttrsParent
    BFalse="  false  "
    BTrue="  true  "
    I="  266703  "
    INeg="  -266703  "
    I8="  112  "
    I8Neg="  -112  "
    I16="  6703  "
    I16Neg="  -6703  "
    I32="  266703  "
    I32Neg="  -266703  "
    I64="  266703  "
    I64Neg="  -266703  "
    UI="  266703  "
    UI8="  112  "
    UI16="  6703  "
    UI32="  266703  "
    UI64="  266703  "
    F32="  266.703  "
    F32Neg="  -266.703  "
    F64="  266.703  "
    F64Neg="  -266.703  "
>
</WhitespaceAttrsParent>
`

// golang.org/issues/22146
func TestUnmarshalWhitespaceAttrs(t *testing.T) {
	v := WhitespaceAttrsParent{}
	if err := Unmarshal([]byte(whitespaceAttrsXML), &v); err != nil {
		t.Fatalf("whitespace attrs: Unmarshal failed: got %v", err)
	}

	want := WhitespaceAttrsParent{
		BFalse: false,
		BTrue:  true,
		I:      266703,
		INeg:   -266703,
		I8:     112,
		I8Neg:  -112,
		I16:    6703,
		I16Neg: -6703,
		I32:    266703,
		I32Neg: -266703,
		I64:    266703,
		I64Neg: -266703,
		UI:     266703,
		UI8:    112,
		UI16:   6703,
		UI32:   266703,
		UI64:   266703,
		F32:    266.703,
		F32Neg: -266.703,
		F64:    266.703,
		F64Neg: -266.703,
	}
	if v != want {
		t.Fatalf("whitespace attrs: Unmarshal:\nhave: %#+v\nwant: %#+v", v, want)
	}
}

// golang.org/issues/53350
func TestUnmarshalIntoNil(t *testing.T) {
	type T struct {
		A int `xml:"A"`
	}

	var nilPointer *T
	err := Unmarshal([]byte("<T><A>1</A></T>"), nilPointer)

	if err == nil {
		t.Fatalf("no error in unmarshalling")
	}

}

func TestCVE202228131(t *testing.T) {
	type nested struct {
		Parent *nested `xml:",any"`
	}
	var n nested
	err := Unmarshal(bytes.Repeat([]byte("<a>"), maxUnmarshalDepth+1), &n)
	if err == nil {
		t.Fatal("Unmarshal did not fail")
	} else if !errors.Is(err, errUnmarshalDepth) {
		t.Fatalf("Unmarshal unexpected error: got %q, want %q", err, errUnmarshalDepth)
	}
}

func TestCVE202230633(t *testing.T) {
	if testing.Short() || runtime.GOARCH == "wasm" {
		t.Skip("test requires significant memory")
	}
	defer func() {
		p := recover()
		if p != nil {
			t.Fatal("Unmarshal panicked")
		}
	}()
	var example struct {
		Things []string
	}
	Unmarshal(bytes.Repeat([]byte("<a>"), 17_000_000), &example)
}
