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selector_test.go
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selector_test.go
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package cascadia
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"log"
"reflect"
"strings"
"testing"
"golang.org/x/net/html"
)
var validSelectors []validSelector
func init() {
c, err := ioutil.ReadFile("test_resources/valid_selectors.json")
if err != nil {
log.Fatal(err)
}
if err = json.Unmarshal(c, &validSelectors); err != nil {
log.Fatal(err)
}
}
type selectorTest struct {
HTML, selector string
results []string
}
func nodeString(n *html.Node) string {
buf := bytes.NewBufferString("")
if err := html.Render(buf, n); err != nil {
log.Fatal(err)
}
return buf.String()
}
var selectorTests = []selectorTest{
{
`<body><address>This address...</address></body>`,
"address",
[]string{
"<address>This address...</address>",
},
},
{
`<!-- comment --><html><head></head><body>text</body></html>`,
"*",
[]string{
"<html><head></head><body>text</body></html>",
"<head></head>",
"<body>text</body>",
},
},
{
`<html><head></head><body></body></html>`,
"*",
[]string{
"<html><head></head><body></body></html>",
"<head></head>",
"<body></body>",
},
},
{
`<p id="foo"><p id="bar">`,
"#foo",
[]string{
`<p id="foo"></p>`,
},
},
{
`<ul><li id="t1"><p id="t1">`,
"li#t1",
[]string{
`<li id="t1"><p id="t1"></p></li>`,
},
},
{
`<ol><li id="t4"><li id="t44">`,
"*#t4",
[]string{
`<li id="t4"></li>`,
},
},
{
`<ul><li class="t1"><li class="t2">`,
".t1",
[]string{
`<li class="t1"></li>`,
},
},
{
`<p class="t1 t2">`,
"p.t1",
[]string{
`<p class="t1 t2"></p>`,
},
},
{
`<div class="test">`,
"div.teST",
[]string{},
},
{
`<p class="t1 t2">`,
".t1.fail",
[]string{},
},
{
`<p class="t1 t2">`,
"p.t1.t2",
[]string{
`<p class="t1 t2"></p>`,
},
},
{
`<p class="--t1 --t2">`,
"p.--t1",
[]string{
`<p class="--t1 --t2"></p>`,
},
},
{
`<p class="--t1 --t2">`,
"p.--t1.--t2",
[]string{
`<p class="--t1 --t2"></p>`,
},
},
{
`<p><p title="title">`,
"p[title]",
[]string{
`<p title="title"></p>`,
},
},
{
`<div><div class="Red">`,
`div[class="red" i]`,
[]string{
`<div class="Red"></div>`,
},
},
{
`<address><address title="foo"><address title="bar">`,
`address[title="foo"]`,
[]string{
`<address title="foo"><address title="bar"></address></address>`,
},
},
{
`<address><address title="fooIgnoreCase"><address title="bar">`,
`address[title="FoOIgnoRECaSe" i]`,
[]string{
`<address title="fooIgnoreCase"><address title="bar"></address></address>`,
},
},
{
`<address><address title="foo"><address title="bar">`,
`address[title!="foo"]`,
[]string{
`<address><address title="foo"><address title="bar"></address></address></address>`,
`<address title="bar"></address>`,
},
},
{
`<address><address title="FOO"><address title="bar">`,
`address[title!="foo" i]`,
[]string{
`<address><address title="FOO"><address title="bar"></address></address></address>`,
`<address title="bar"></address>`,
},
},
{
`<p title="fooBARuFOO"><p title="varfoo">`,
`p[title!="FooBarUFoo" i]`,
[]string{
`<p title="varfoo"></p>`,
},
},
{
`<p title="tot foo bar">`,
`[ title ~= foo ]`,
[]string{
`<p title="tot foo bar"></p>`,
},
},
{
`<p title="tot foo bar">`,
`p[title~="FOO" i]`,
[]string{
`<p title="tot foo bar"></p>`,
},
},
{
`<p title="tot foo bar">`,
`p[title~=toofoo i]`,
[]string{},
},
{
`<p title="hello world">`,
`[title~="hello world"]`,
[]string{},
},
{
`<p title="HELLO world">`,
`[title~="hello" i]`,
[]string{
`<p title="HELLO world"></p>`,
},
},
{
`<p title="HELLO world">`,
`[title~="hello" I]`,
[]string{
`<p title="HELLO world"></p>`,
},
},
{
`<p lang="en"><p lang="en-gb"><p lang="enough"><p lang="fr-en">`,
`[lang|="en"]`,
[]string{
`<p lang="en"></p>`,
`<p lang="en-gb"></p>`,
},
},
{
`<p lang="en"><p lang="En-gb"><p lang="enough"><p lang="fr-en">`,
`[lang|="EN" i]`,
[]string{
`<p lang="en"></p>`,
`<p lang="En-gb"></p>`,
},
},
{
`<p lang="en"><p lang="En-gb"><p lang="enough"><p lang="fr-en">`,
`[lang|="EN" i]`,
[]string{
`<p lang="en"></p>`,
`<p lang="En-gb"></p>`,
},
},
{
`<p title="foobar"><p title="barfoo">`,
`[title^="foo"]`,
[]string{
`<p title="foobar"></p>`,
},
},
{
`<p title="FooBAR"><p title="barfoo">`,
`[title^="foo" i]`,
[]string{
`<p title="FooBAR"></p>`,
},
},
{
`<p title="foobar"><p title="barfoo">`,
`[title$="bar"]`,
[]string{
`<p title="foobar"></p>`,
},
},
{
`<p title="foobar"><p title="barfoo">`,
`[title$="BAR" i]`,
[]string{
`<p title="foobar"></p>`,
},
},
{
`<p title="foobarufoo">`,
`[title*="bar"]`,
[]string{
`<p title="foobarufoo"></p>`,
},
},
{
`<p title="foobarufoo">`,
`[title*="BaRu" i]`,
[]string{
`<p title="foobarufoo"></p>`,
},
},
{
`<p title="foobarufoo">`,
`[title*="BaRu" I]`,
[]string{
`<p title="foobarufoo"></p>`,
},
},
{
`<p class=" ">This text should be green.</p><p>This text should be green.</p>`,
`p[class$=" "]`,
[]string{},
},
{
`<p class="">This text should be green.</p><p>This text should be green.</p>`,
`p[class$=""]`,
[]string{},
},
{
`<p class=" ">This text should be green.</p><p>This text should be green.</p>`,
`p[class^=" "]`,
[]string{},
},
{
`<p class="">This text should be green.</p><p>This text should be green.</p>`,
`p[class^=""]`,
[]string{},
},
{
`<p class=" ">This text should be green.</p><p>This text should be green.</p>`,
`p[class*=" "]`,
[]string{},
},
{
`<p class="">This text should be green.</p><p>This text should be green.</p>`,
`p[class*=""]`,
[]string{},
},
{
`<input type="radio" name="Sex" value="F"/>`,
`input[name=Sex][value=F]`,
[]string{
`<input type="radio" name="Sex" value="F"/>`,
},
},
{
`<table border="0" cellpadding="0" cellspacing="0" style="table-layout: fixed; width: 100%; border: 0 dashed; border-color: #FFFFFF"><tr style="height:64px">aaa</tr></table>`,
`table[border="0"][cellpadding="0"][cellspacing="0"]`,
[]string{
`<table border="0" cellpadding="0" cellspacing="0" style="table-layout: fixed; width: 100%; border: 0 dashed; border-color: #FFFFFF"><tbody><tr style="height:64px"></tr></tbody></table>`,
},
},
{
`<p class="t1 t2">`,
".t1:not(.t2)",
[]string{},
},
{
`<div class="t3">`,
`div:not(.t1)`,
[]string{
`<div class="t3"></div>`,
},
},
{
`<div><div class="t2"><div class="t3">`,
`div:not([class="t2"])`,
[]string{
`<div><div class="t2"><div class="t3"></div></div></div>`,
`<div class="t3"></div>`,
},
},
{
`<ol><li id=1><li id=2><li id=3></ol>`,
`li:nth-child(odd)`,
[]string{
`<li id="1"></li>`,
`<li id="3"></li>`,
},
},
{
`<ol><li id=1><li id=2><li id=3></ol>`,
`li:nth-child(even)`,
[]string{
`<li id="2"></li>`,
},
},
{
`<ol><li id=1><li id=2><li id=3></ol>`,
`li:nth-child(-n+2)`,
[]string{
`<li id="1"></li>`,
`<li id="2"></li>`,
},
},
{
`<ol><li id=1><li id=2><li id=3></ol>`,
`li:nth-child(3n+1)`,
[]string{
`<li id="1"></li>`,
},
},
{
`<ol><li id=1><li id=2><li id=3><li id=4></ol>`,
`li:nth-last-child(odd)`,
[]string{
`<li id="2"></li>`,
`<li id="4"></li>`,
},
},
{
`<ol><li id=1><li id=2><li id=3><li id=4></ol>`,
`li:nth-last-child(even)`,
[]string{
`<li id="1"></li>`,
`<li id="3"></li>`,
},
},
{
`<ol><li id=1><li id=2><li id=3><li id=4></ol>`,
`li:nth-last-child(-n+2)`,
[]string{
`<li id="3"></li>`,
`<li id="4"></li>`,
},
},
{
`<ol><li id=1><li id=2><li id=3><li id=4></ol>`,
`li:nth-last-child(3n+1)`,
[]string{
`<li id="1"></li>`,
`<li id="4"></li>`,
},
},
{
`<p>some text <span id="1">and a span</span><span id="2"> and another</span></p>`,
`span:first-child`,
[]string{
`<span id="1">and a span</span>`,
},
},
{
`<span>a span</span> and some text`,
`span:last-child`,
[]string{
`<span>a span</span>`,
},
},
{
`<address></address><p id=1><p id=2>`,
`p:nth-of-type(2)`,
[]string{
`<p id="2"></p>`,
},
},
{
`<address></address><p id=1><p id=2></p><a>`,
`p:nth-last-of-type(2)`,
[]string{
`<p id="1"></p>`,
},
},
{
`<address></address><p id=1><p id=2></p><a>`,
`p:last-of-type`,
[]string{
`<p id="2"></p>`,
},
},
{
`<address></address><p id=1><p id=2></p><a>`,
`p:first-of-type`,
[]string{
`<p id="1"></p>`,
},
},
{
`<div><p id="1"></p><a></a></div><div><p id="2"></p></div>`,
`p:only-child`,
[]string{
`<p id="2"></p>`,
},
},
{
`<div><p id="1"></p><a></a></div><div><p id="2"></p><p id="3"></p></div>`,
`p:only-of-type`,
[]string{
`<p id="1"></p>`,
},
},
{
`<p id="1"><!-- --><p id="2">Hello<p id="3"><span>`,
`:empty`,
[]string{
`<head></head>`,
`<p id="1"><!-- --></p>`,
`<span></span>`,
},
},
{
`<div><p id="1"><table><tr><td><p id="2"></table></div><p id="3">`,
`div p`,
[]string{
`<p id="1"><table><tbody><tr><td><p id="2"></p></td></tr></tbody></table></p>`,
`<p id="2"></p>`,
},
},
{
`<div><p id="1"><table><tr><td><p id="2"></table></div><p id="3">`,
`div table p`,
[]string{
`<p id="2"></p>`,
},
},
{
`<div><p id="1"><div><p id="2"></div><table><tr><td><p id="3"></table></div>`,
`div > p`,
[]string{
`<p id="1"></p>`,
`<p id="2"></p>`,
},
},
{
`<p id="1"><p id="2"></p><address></address><p id="3">`,
`p ~ p`,
[]string{
`<p id="2"></p>`,
`<p id="3"></p>`,
},
},
{
`<p id="1"></p>
<!--comment-->
<p id="2"></p><address></address><p id="3">`,
`p + p`,
[]string{
`<p id="2"></p>`,
},
},
{
`<ul><li></li><li></li></ul><p>`,
`li, p`,
[]string{
"<li></li>",
"<li></li>",
"<p></p>",
},
},
{
`<p id="1"><p id="2"></p><address></address><p id="3">`,
`p +/*This is a comment*/ p`,
[]string{
`<p id="2"></p>`,
},
},
{
`<p>Text block that <span>wraps inner text</span> and continues</p>`,
`p:contains("that wraps")`,
[]string{
`<p>Text block that <span>wraps inner text</span> and continues</p>`,
},
},
{
`<p>Text block that <span>wraps inner text</span> and continues</p>`,
`p:containsOwn("that wraps")`,
[]string{},
},
{
`<p>Text block that <span>wraps inner text</span> and continues</p>`,
`:containsOwn("inner")`,
[]string{
`<span>wraps inner text</span>`,
},
},
{
`<p>Text block that <span>wraps inner text</span> and continues</p>`,
`p:containsOwn("block")`,
[]string{
`<p>Text block that <span>wraps inner text</span> and continues</p>`,
},
},
{
`<div id="d1"><p id="p1"><span>text content</span></p></div><div id="d2"/>`,
`div:has(#p1)`,
[]string{
`<div id="d1"><p id="p1"><span>text content</span></p></div>`,
},
},
{
`<div id="d1"><p id="p1"><span>contents 1</span></p></div>
<div id="d2"><p>contents <em>2</em></p></div>`,
`div:has(:containsOwn("2"))`,
[]string{
`<div id="d2"><p>contents <em>2</em></p></div>`,
},
},
{
`<body><div id="d1"><p id="p1"><span>contents 1</span></p></div>
<div id="d2"><p id="p2">contents <em>2</em></p></div></body>`,
`body :has(:containsOwn("2"))`,
[]string{
`<div id="d2"><p id="p2">contents <em>2</em></p></div>`,
`<p id="p2">contents <em>2</em></p>`,
},
},
{
`<body><div id="d1"><p id="p1"><span>contents 1</span></p></div>
<div id="d2"><p id="p2">contents <em>2</em></p></div></body>`,
`body :haschild(:containsOwn("2"))`,
[]string{
`<p id="p2">contents <em>2</em></p>`,
},
},
{
`<p id="p1">0123456789</p><p id="p2">abcdef</p><p id="p3">0123ABCD</p>`,
`p:matches([\d])`,
[]string{
`<p id="p1">0123456789</p>`,
`<p id="p3">0123ABCD</p>`,
},
},
{
`<p id="p1">0123456789</p><p id="p2">abcdef</p><p id="p3">0123ABCD</p>`,
`p:matches([a-z])`,
[]string{
`<p id="p2">abcdef</p>`,
},
},
{
`<p id="p1">0123456789</p><p id="p2">abcdef</p><p id="p3">0123ABCD</p>`,
`p:matches([a-zA-Z])`,
[]string{
`<p id="p2">abcdef</p>`,
`<p id="p3">0123ABCD</p>`,
},
},
{
`<p id="p1">0123456789</p><p id="p2">abcdef</p><p id="p3">0123ABCD</p>`,
`p:matches([^\d])`,
[]string{
`<p id="p2">abcdef</p>`,
`<p id="p3">0123ABCD</p>`,
},
},
{
`<p id="p1">0123456789</p><p id="p2">abcdef</p><p id="p3">0123ABCD</p>`,
`p:matches(^(0|a))`,
[]string{
`<p id="p1">0123456789</p>`,
`<p id="p2">abcdef</p>`,
`<p id="p3">0123ABCD</p>`,
},
},
{
`<p id="p1">0123456789</p><p id="p2">abcdef</p><p id="p3">0123ABCD</p>`,
`p:matches(^\d+$)`,
[]string{
`<p id="p1">0123456789</p>`,
},
},
{
`<p id="p1">0123456789</p><p id="p2">abcdef</p><p id="p3">0123ABCD</p>`,
`p:not(:matches(^\d+$))`,
[]string{
`<p id="p2">abcdef</p>`,
`<p id="p3">0123ABCD</p>`,
},
},
{
`<div><p id="p1">01234<em>567</em>89</p><div>`,
`div :matchesOwn(^\d+$)`,
[]string{
`<p id="p1">01234<em>567</em>89</p>`,
`<em>567</em>`,
},
},
{
`<ul>
<li><a id="a1" href="http://www.google.com/finance"></a>
<li><a id="a2" href="http://finance.yahoo.com/"></a>
<li><a id="a2" href="http://finance.untrusted.com/"/>
<li><a id="a3" href="https://www.google.com/news"/>
<li><a id="a4" href="http://news.yahoo.com"/>
</ul>`,
`[href#=(fina)]:not([href#=(\/\/[^\/]+untrusted)])`,
[]string{
`<a id="a1" href="http://www.google.com/finance"></a>`,
`<a id="a2" href="http://finance.yahoo.com/"></a>`,
},
},
{
`<ul>
<li><a id="a1" href="http://www.google.com/finance"/>
<li><a id="a2" href="http://finance.yahoo.com/"/>
<li><a id="a3" href="https://www.google.com/news"></a>
<li><a id="a4" href="http://news.yahoo.com"/>
</ul>`,
`[href#=(^https:\/\/[^\/]*\/?news)]`,
[]string{
`<a id="a3" href="https://www.google.com/news"></a>`,
},
},
{
`<form>
<label>Username <input type="text" name="username" /></label>
<label>Password <input type="password" name="password" /></label>
<label>Country
<select name="country">
<option value="ca">Canada</option>
<option value="us">United States</option>
</select>
</label>
<label>Bio <textarea name="bio"></textarea></label>
<button>Sign up</button>
</form>`,
`:input`,
[]string{
`<input type="text" name="username"/>`,
`<input type="password" name="password"/>`,
`<select name="country">
<option value="ca">Canada</option>
<option value="us">United States</option>
</select>`,
`<textarea name="bio"></textarea>`,
`<button>Sign up</button>`,
},
},
{
`<html><head></head><body></body></html>`,
":root",
[]string{
"<html><head></head><body></body></html>",
},
},
{
`<html><head></head><body></body></html>`,
"*:root",
[]string{
"<html><head></head><body></body></html>",
},
},
{
`<html><head></head><body></body></html>`,
"html:nth-child(1)",
[]string{
"<html><head></head><body></body></html>",
},
},
{
`<html><head></head><body></body></html>`,
"*:root:first-child",
[]string{
`<html><head></head><body></body></html>`,
},
},
{
`<html><head></head><body></body></html>`,
"*:root:nth-child(1)",
[]string{
`<html><head></head><body></body></html>`,
},
},
{
`<html><head></head><body><a href="http://www.foo.com"></a></body></html>`,
"a:not(:root)",
[]string{
`<a href="http://www.foo.com"></a>`,
},
},
{
`<html><head></head><body><p></p><div></div><span></span><a></a><form></form></body></html>`,
"body > *:nth-child(3n+2)",
[]string{
"<div></div>",
"<form></form>",
},
},
{
`<html><head></head><body><fieldset disabled><legend id="1"><input id="i1"/></legend><legend id="2"><input id="i2"/></legend></fieldset></body></html>`,
"input:disabled",
[]string{
`<input id="i2"/>`,
},
},
{
`<html><head></head><body><fieldset disabled></fieldset></body></html>`,
":disabled",
[]string{
`<fieldset disabled=""></fieldset>`,
},
},
{
`<html><head></head><body><fieldset></fieldset></body></html>`,
":enabled",
[]string{
`<fieldset></fieldset>`,
},
},
{
`<div class=class1></div><div class=class2></div><div class=class3></div>`,
"div.class1, div.class2",
[]string{
`<div class="class1"></div>`,
`<div class="class2"></div>`,
},
},
}
func setup(selector, testHTML string) (Selector, *html.Node, error) {
s, err := Compile(selector)
if err != nil {
return nil, nil, fmt.Errorf("error compiling %q: %s", selector, err)
}
doc, err := html.Parse(strings.NewReader(testHTML))
if err != nil {
return nil, nil, fmt.Errorf("error parsing %q: %s", testHTML, err)
}
return s, doc, nil
}
func TestSelectors(t *testing.T) {
for _, test := range selectorTests {
s, doc, err := setup(test.selector, test.HTML)
if err != nil {
t.Error(err)
continue
}
matches := s.MatchAll(doc)
if len(matches) != len(test.results) {
t.Errorf("selector %s wanted %d elements, got %d instead", test.selector, len(test.results), len(matches))
continue
}
for i, m := range matches {
got := nodeString(m)
if got != test.results[i] {
t.Errorf("selector %s wanted %s, got %s instead", test.selector, test.results[i], got)
}
}
firstMatch := s.MatchFirst(doc)
if len(test.results) == 0 {
if firstMatch != nil {
t.Errorf("MatchFirst: selector %s want nil, got %s", test.selector, nodeString(firstMatch))
}
} else {
got := nodeString(firstMatch)
if got != test.results[0] {
t.Errorf("MatchFirst: selector %s want %s, got %s", test.selector, test.results[0], got)
}
}
}
}
func setupMatcher(selector, testHTML string) (Matcher, *html.Node, error) {
s, err := ParseGroup(selector)
if err != nil {
return nil, nil, fmt.Errorf("error compiling %q: %s", selector, err)
}
doc, err := html.Parse(strings.NewReader(testHTML))
if err != nil {
return nil, nil, fmt.Errorf("error parsing %q: %s", testHTML, err)
}
return s, doc, nil
}
func TestMatchers(t *testing.T) {
for _, test := range selectorTests {
s, doc, err := setupMatcher(test.selector, test.HTML)
if err != nil {
t.Error(err)
continue
}
matches := QueryAll(doc, s)
if len(matches) != len(test.results) {
t.Errorf("selector %s wanted %d elements, got %d instead", test.selector, len(test.results), len(matches))
continue
}
for i, m := range matches {
got := nodeString(m)
if got != test.results[i] {
t.Errorf("selector %s wanted %s, got %s instead", test.selector, test.results[i], got)
}
}
firstMatch := Query(doc, s)
if len(test.results) == 0 {
if firstMatch != nil {
t.Errorf("Query: selector %s want nil, got %s", test.selector, nodeString(firstMatch))
}
} else {
got := nodeString(firstMatch)
if got != test.results[0] {
t.Errorf("Query: selector %s want %s, got %s", test.selector, test.results[0], got)
}
}
if !reflect.DeepEqual(matches, Selector(s.Match).Filter(matches)) {
t.Fatalf("inconsistent Filter result")
}
}
}
type testPseudo struct {
HTML, selector string
spec Specificity
pseudo string
}
var testsPseudo = []testPseudo{
{
HTML: `<html><body><ul><ol><li id="s12" class="red level"></li></ol></ul></body></html>`,
selector: "#s12:not(FOO)::before",
spec: Specificity{1, 0, 2},
pseudo: "before",
},
{
HTML: `<html><body><ul><ol><li id="s12" class="red level"></li></ol></ul></body></html>`,
selector: "#s12::first-line",
spec: Specificity{1, 0, 1},
pseudo: "first-line",
},
{
HTML: `<html><body><ul><ol><li id="s12" class="red level"></li></ol></ul></body></html>`,
selector: "ol > #s12:first-line",
spec: Specificity{1, 0, 2},
pseudo: "first-line",
},
{
HTML: `<html><body><ul><ol><li id="s12" class="red level"></li></ol></ul></body></html>`,
selector: "#s12:not(FOO)::after",
spec: Specificity{1, 0, 2},
pseudo: "after",
},
{
HTML: `<html><body><ul><ol><li id="s12" class="red level"></li></ol></ul></body></html>`,
selector: "LI.red.level:before",
spec: Specificity{0, 2, 2},
pseudo: "before",
},
}
func TestPseudoElement(t *testing.T) {
for _, test := range testsPseudo {
s, err := ParseWithPseudoElement(test.selector)
if err != nil {
t.Fatalf("error compiling %q: %s", test.selector, err)
}
if _, err = Parse(test.selector); err == nil {
t.Fatalf("selector %s with pseudo-element should not compile", test.selector)
}
doc, err := html.Parse(strings.NewReader(test.HTML))
if err != nil {
t.Fatalf("error parsing %q: %s", test.HTML, err)
}
body := doc.FirstChild.LastChild
testNode := body.FirstChild.FirstChild.LastChild
if !s.Match(testNode) {
t.Errorf("%s didn't match (html tree : \n %s) \n", test.selector, nodeString(doc))
continue
}
if s.Specificity() != test.spec {
t.Errorf("wrong specificity : expected %v got %v", test.spec, s.Specificity())
}
if s.PseudoElement() != test.pseudo {
t.Errorf("wrong pseudo-element : expected %s got %s", test.pseudo, s.PseudoElement())
}
}
}
type invalidSelector struct {
Name string `json:"name,omitempty"`
Selector string `json:"selector,omitempty"`
}
type validSelector struct {
invalidSelector
Expect []string `json:"expect,omitempty"`
Exclude []string `json:"exclude,omitempty"`
Level int `json:"level,omitempty"`
Xfail bool `json:"xfail,omitempty"`
}
func TestShakespeare(t *testing.T) {
doc := parseReference("test_resources/shakespeare.html")
body := doc.FirstChild.NextSibling.LastChild
assertCount := func(selector string, expected int) {
sel, err := ParseGroup(selector)
if err != nil {
t.Errorf("invalid selector %s", selector)
}
if l := len(Selector(sel.Match).MatchAll(body)); l != expected {
t.Errorf("%s -> expected %d, got %d", selector, expected, l)
}
}
// Data borrowed from https://github.com/Kozea/cssselect2
assertCount("*", 246)
assertCount("div:only-child", 22) // ?
assertCount("div:nth-child(even)", 106)
assertCount("div:nth-child(2n)", 106)
assertCount("div:nth-child(odd)", 137)
assertCount("div:nth-child(2n+1)", 137)
assertCount("div:nth-child(n)", 243)
assertCount("div:last-child", 53)
assertCount("div:first-child", 51)