How to use Next method of html Package

Best K6 code snippet using html.Next

node_test.go

Source:node_test.go Github

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...16 }17 if err := checkNodeConsistency(n); err != nil {18 return err19 }20 for c := n.FirstChild; c != nil; c = c.NextSibling {21 if err := checkTreeConsistency1(c, depth+1); err != nil {22 return err23 }24 }25 return nil26}27// checkNodeConsistency checks that a node's parent/child/sibling relationships28// are consistent.29func checkNodeConsistency(n *Node) error {30 if n == nil {31 return nil32 }33 nParent := 034 for p := n.Parent; p != nil; p = p.Parent {35 nParent++36 if nParent == 1e4 {37 return fmt.Errorf("html: parent list looks like an infinite loop")38 }39 }40 nForward := 041 for c := n.FirstChild; c != nil; c = c.NextSibling {42 nForward++43 if nForward == 1e6 {44 return fmt.Errorf("html: forward list of children looks like an infinite loop")45 }46 if c.Parent != n {47 return fmt.Errorf("html: inconsistent child/parent relationship")48 }49 }50 nBackward := 051 for c := n.LastChild; c != nil; c = c.PrevSibling {52 nBackward++53 if nBackward == 1e6 {54 return fmt.Errorf("html: backward list of children looks like an infinite loop")55 }56 if c.Parent != n {57 return fmt.Errorf("html: inconsistent child/parent relationship")58 }59 }60 if n.Parent != nil {61 if n.Parent == n {62 return fmt.Errorf("html: inconsistent parent relationship")63 }64 if n.Parent == n.FirstChild {65 return fmt.Errorf("html: inconsistent parent/first relationship")66 }67 if n.Parent == n.LastChild {68 return fmt.Errorf("html: inconsistent parent/last relationship")69 }70 if n.Parent == n.PrevSibling {71 return fmt.Errorf("html: inconsistent parent/prev relationship")72 }73 if n.Parent == n.NextSibling {74 return fmt.Errorf("html: inconsistent parent/next relationship")75 }76 parentHasNAsAChild := false77 for c := n.Parent.FirstChild; c != nil; c = c.NextSibling {78 if c == n {79 parentHasNAsAChild = true80 break81 }82 }83 if !parentHasNAsAChild {84 return fmt.Errorf("html: inconsistent parent/child relationship")85 }86 }87 if n.PrevSibling != nil && n.PrevSibling.NextSibling != n {88 return fmt.Errorf("html: inconsistent prev/next relationship")89 }90 if n.NextSibling != nil && n.NextSibling.PrevSibling != n {91 return fmt.Errorf("html: inconsistent next/prev relationship")92 }93 if (n.FirstChild == nil) != (n.LastChild == nil) {94 return fmt.Errorf("html: inconsistent first/last relationship")95 }96 if n.FirstChild != nil && n.FirstChild == n.LastChild {97 // We have a sole child.98 if n.FirstChild.PrevSibling != nil || n.FirstChild.NextSibling != nil {99 return fmt.Errorf("html: inconsistent sole child's sibling relationship")100 }101 }102 seen := map[*Node]bool{}103 var last *Node104 for c := n.FirstChild; c != nil; c = c.NextSibling {105 if seen[c] {106 return fmt.Errorf("html: inconsistent repeated child")107 }108 seen[c] = true109 last = c110 }111 if last != n.LastChild {112 return fmt.Errorf("html: inconsistent last relationship")113 }114 var first *Node115 for c := n.LastChild; c != nil; c = c.PrevSibling {116 if !seen[c] {117 return fmt.Errorf("html: inconsistent missing child")118 }...

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doc.go

Source:doc.go Github

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...5Package html implements an HTML5-compliant tokenizer and parser.6Tokenization is done by creating a Tokenizer for an io.Reader r. It is the7caller's responsibility to ensure that r provides UTF-8 encoded HTML.8 z := html.NewTokenizer(r)9Given a Tokenizer z, the HTML is tokenized by repeatedly calling z.Next(),10which parses the next token and returns its type, or an error:11 for {12 tt := z.Next()13 if tt == html.ErrorToken {14 // ...15 return ...16 }17 // Process the current token.18 }19There are two APIs for retrieving the current token. The high-level API is to20call Token; the low-level API is to call Text or TagName / TagAttr. Both APIs21allow optionally calling Raw after Next but before Token, Text, TagName, or22TagAttr. In EBNF notation, the valid call sequence per token is:23 Next {Raw} [ Token | Text | TagName {TagAttr} ]24Token returns an independent data structure that completely describes a token.25Entities (such as "<") are unescaped, tag names and attribute keys are26lower-cased, and attributes are collected into a []Attribute. For example:27 for {28 if z.Next() == html.ErrorToken {29 // Returning io.EOF indicates success.30 return z.Err()31 }32 emitToken(z.Token())33 }34The low-level API performs fewer allocations and copies, but the contents of35the []byte values returned by Text, TagName and TagAttr may change on the next36call to Next. For example, to extract an HTML page's anchor text:37 depth := 038 for {39 tt := z.Next()40 switch tt {41 case html.ErrorToken:42 return z.Err()43 case html.TextToken:44 if depth > 0 {45 // emitBytes should copy the []byte it receives,46 // if it doesn't process it immediately.47 emitBytes(z.Text())48 }49 case html.StartTagToken, html.EndTagToken:50 tn, _ := z.TagName()51 if len(tn) == 1 && tn[0] == 'a' {52 if tt == html.StartTagToken {53 depth++54 } else {55 depth--56 }57 }58 }59 }60Parsing is done by calling Parse with an io.Reader, which returns the root of61the parse tree (the document element) as a *Node. It is the caller's62responsibility to ensure that the Reader provides UTF-8 encoded HTML. For63example, to process each anchor node in depth-first order:64 doc, err := html.Parse(r)65 if err != nil {66 // ...67 }68 var f func(*html.Node)69 f = func(n *html.Node) {70 if n.Type == html.ElementNode && n.Data == "a" {71 // Do something with n...72 }73 for c := n.FirstChild; c != nil; c = c.NextSibling {74 f(c)75 }76 }77 f(doc)78The relevant specifications include:79https://html.spec.whatwg.org/multipage/syntax.html and80https://html.spec.whatwg.org/multipage/syntax.html#tokenization81*/82package html // import "golang.org/x/net/html"83// The tokenization algorithm implemented by this package is not a line-by-line84// transliteration of the relatively verbose state-machine in the WHATWG85// specification. A more direct approach is used instead, where the program86// counter implies the state, such as whether it is tokenizing a tag or a text87// node. Specification compliance is verified by checking expected and actual...

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1import (2func main() {3 doc, err := html.Parse(os.Stdin)4 if err != nil {5 fmt.Fprintf(os.Stderr, "findlinks1: %v6 os.Exit(1)7 }8 for _, link := range visit(nil, doc) {9 fmt.Println(link)10 }11}12func visit(links []string, n *html.Node) []string {13 if n.Type == html.ElementNode && n.Data == "a" {14 for _, a := range n.Attr {15 if a.Key == "href" {16 links = append(links, a.Val)17 }18 }19 }20 for c := n.FirstChild; c != nil; c = c.NextSibling {21 links = visit(links, c)22 }23}24import (25func main() {26 doc, err := html.Parse(os.Stdin)27 if err != nil {28 fmt.Fprintf(os.Stderr, "findlinks2: %v29 os.Exit(1)30 }31 for _, link := range visit(nil, doc) {32 fmt.Println(link)33 }34}35func visit(links []string, n *html.Node) []string {36 if n.Type == html.ElementNode && n.Data == "a" {37 for _, a := range n.Attr {38 if a.Key == "href" {39 links = append(links, a.Val)40 }41 }42 }43 for c := n.FirstChild; c != nil; c = c.NextSibling {44 links = visit(links, c)45 }46}47import (48func main() {49 doc, err := html.Parse(os.Stdin)50 if err != nil {51 fmt.Fprintf(os.Stderr, "findlinks3: %v52 os.Exit(1)53 }54 for _, link := range visit(nil, doc) {55 fmt.Println(link)56 }57}58func visit(links []string, n *html.Node) []string {

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1import (2func main() {3 doc, err := html.Parse(os.Stdin)4 if err != nil {5 log.Fatalf("findlinks1: %v", err)6 }7 for _, link := range visit(nil, doc) {8 fmt.Println(link)9 }10}11func visit(links []string, n *html.Node) []string {12 if n.Type == html.ElementNode && n.Data == "a" {13 for _, a := range n.Attr {14 if a.Key == "href" {15 links = append(links, a.Val)16 }17 }18 }19 for c := n.FirstChild; c != nil; c = c.NextSibling {20 links = visit(links, c)21 }22}23import (24func main() {25 doc, err := html.Parse(os.Stdin)26 if err != nil {27 log.Fatalf("findlinks2: %v", err)28 }29 for _, link := range visit(nil, doc) {30 fmt.Println(link)31 }32}33func visit(links []string, n *html.Node) []string {34 if n.Type == html.ElementNode && n.Data == "a" {35 for _, a := range n.Attr {36 if a.Key == "href" {37 links = append(links, a.Val)38 }39 }40 }41 if n.FirstChild != nil {42 links = visit(links, n.FirstChild)43 }44 if n.NextSibling != nil {45 links = visit(links, n.NextSibling)46 }47}48import (49func main() {50 doc, err := html.Parse(os.Stdin)51 if err != nil {52 log.Fatalf("findlinks3: %v", err)53 }54 for _, link := range visit(nil, doc) {55 fmt.Println(link)56 }57}58func visit(links []

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1import (2func main() {3 doc, err := html.Parse(os.Stdin)4 if err != nil {5 fmt.Fprintf(os.Stderr, "findlinks1: %v6 os.Exit(1)7 }8 for _, link := range visit(nil, doc) {9 fmt.Println(link)10 }11}12func visit(links []string, n *html.Node) []string {13 if n.Type == html.ElementNode && n.Data == "a" {14 for _, a := range n.Attr {15 if a.Key == "href" {16 links = append(links, a.Val)17 }18 }19 }20 for c := n.FirstChild; c != nil; c = c.NextSibling {21 links = visit(links, c)22 }23}24import (25func main() {26 doc, err := html.Parse(os.Stdin)27 if err != nil {28 fmt.Fprintf(os.Stderr, "findlinks1: %v29 os.Exit(1)30 }31 for _, link := range visit(nil, doc) {32 fmt.Println(link)33 }34}35func visit(links []string, n *html.Node) []string {36 if n.Type == html.ElementNode && n.Data == "a" {37 for _, a := range n.Attr {38 if a.Key == "href" {39 links = append(links, a.Val)40 }41 }42 }43 for c := n.FirstChild; c != nil; c = c.NextSibling {44 links = visit(links, c)45 }46}47import (48func main() {49 doc, err := html.Parse(os.Stdin)50 if err != nil {51 fmt.Fprintf(os.Stderr, "findlinks1: %v52 os.Exit(1)53 }54 for _, link := range visit(nil, doc) {55 fmt.Println(link)56 }57}58func visit(links []string, n *html.Node) []string {

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1import (2func main() {3 if err != nil {4 fmt.Println(err)5 }6 defer resp.Body.Close()7 doc, err := html.Parse(resp.Body)8 if err != nil {9 fmt.Println(err)10 }11 var f func(*html.Node)12 f = func(n *html.Node) {13 if n.Type == html.ElementNode {14 fmt.Println(n.Data)15 }16 for c := n.FirstChild; c != nil; c = c.NextSibling {17 f(c)18 }19 }20 f(doc)21}

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1import (2func main() {3 for _, url := range os.Args[1:] {4 resp, err := http.Get(url)5 if err != nil {6 log.Fatal(err)7 }8 doc, err := html.Parse(resp.Body)9 resp.Body.Close()10 if err != nil {11 log.Fatal(err)12 }13 forEachNode(doc, startElement, endElement)14 }15}16func forEachNode(n *html.Node, pre, post func(n *html.Node)) {17 if pre != nil {18 pre(n)19 }20 for c := n.FirstChild; c != nil; c = c.NextSibling {21 forEachNode(c, pre, post)22 }23 if post != nil {24 post(n)25 }26}27func startElement(n *html.Node) {28 if n.Type == html.ElementNode {29 fmt.Printf("%*s<%s>\n", depth*2, "", n.Data)30 }31}32func endElement(n *html.Node) {33 if n.Type == html.ElementNode {34 fmt.Printf("%*s</%s>\n", depth*2, "", n.Data)35 }36}37import (38func main() {39 for _, url := range os.Args[1:] {40 resp, err := http.Get(url)41 if err != nil {42 log.Fatal(err)43 }44 doc, err := html.Parse(resp.Body)45 resp.Body.Close()46 if err != nil {47 log.Fatal(err)48 }49 forEachNode(doc, startElement, endElement)50 }51}52func forEachNode(n *html.Node, pre, post func(n *html.Node)) {53 if pre != nil {54 pre(n)55 }56 for c := n.FirstChild; c != nil; c = c.NextSibling {57 forEachNode(c, pre, post)58 }59 if post != nil {60 post(n)61 }62}63func startElement(n *html.Node) {64 if n.Type == html.ElementNode {65 fmt.Printf("%*s<%s

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1import (2func main() {3 doc, err := html.Parse(os.Stdin)4 if err != nil {5 fmt.Fprintf(os.Stderr, "findlinks1: %v\n", err)6 os.Exit(1)7 }8 for _, link := range visit(nil, doc) {9 fmt.Println(link)10 }11}12func visit(links []string, n *html.Node) []string {13 if n.Type == html.ElementNode && n.Data == "a" {14 for _, a := range n.Attr {15 if a.Key == "href" {16 links = append(links, a.Val)17 }18 }19 }20 for c := n.FirstChild; c != nil; c = c.NextSibling {21 links = visit(links, c)22 }23}24import (25func main() {26 doc, err := html.Parse(os.Stdin)27 if err != nil {28 fmt.Fprintf(os.Stderr, "findlinks1: %v\n", err)29 os.Exit(1)30 }31 for _, link := range visit(nil, doc) {32 fmt.Println(link)33 }34}35func visit(links []string, n *html.Node) []string {36 if n.Type == html.ElementNode && n.Data == "a" {37 for _, a := range n.Attr {38 if a.Key == "href" {39 links = append(links, a.Val)40 }41 }42 }43 if n.FirstChild != nil {44 links = visit(links, n.FirstChild)45 }46 if n.NextSibling != nil {47 links = visit(links, n.NextSibling)48 }49}50import (51func main() {52 doc, err := html.Parse(os.Stdin)53 if err != nil {54 fmt.Fprintf(os.Stderr, "findlinks1: %v\n", err)55 os.Exit(1

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1import (2func main() {3 if err != nil {4 fmt.Println(err)5 }6 doc, err := html.Parse(resp.Body)7 if err != nil {8 fmt.Println(err)9 }10 forEachNode(doc, startElement, endElement)11}12func startElement(n *html.Node) {13 if n.Type == html.ElementNode {14 fmt.Printf("<%s>", n.Data)15 }16}17func endElement(n *html.Node) {18 if n.Type == html.ElementNode {19 fmt.Printf("</%s>", n.Data)20 }21}22func forEachNode(n *html.Node, pre, post func(n *html.Node)) {23 if pre != nil {24 pre(n)25 }26 for c := n.FirstChild; c != nil; c = c.NextSibling {27 forEachNode(c, pre, post)28 }29 if post != nil {30 post(n)31 }32}

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1import (2func main() {3 doc, err := html.Parse(os.Stdin)4 if err != nil {5 fmt.Fprintf(os.Stderr, "findlinks1: %v\n", err)6 os.Exit(1)7 }8 for _, link := range visit(nil, doc) {9 fmt.Println(link)10 }11}12func visit(links []string, n *html.Node) []string {13 if n.Type == html.ElementNode && n.Data == "a" {14 for _, a := range n.Attr {15 if a.Key == "href" {16 links = append(links, a.Val)17 }18 }19 }20 for c := n.FirstChild; c != nil; c = c.NextSibling {21 links = visit(links, c)22 }23}24import (25func main() {26 doc, err := html.Parse(os.Stdin)27 if err != nil {28 fmt.Fprintf(os.Stderr, "findlinks1: %v\n", err)29 os.Exit(1)30 }31 for _, link := range visit(nil, doc) {32 fmt.Println(link)33 }34}35func visit(links []string, n *html.Node) []string {36 if n.Type == html.ElementNode && n.Data == "a" {37 for _, a := range n.Attr {38 if a.Key == "href" {39 links = append(links, a.Val)40 }41 }42 }43 for c := n.FirstChild; c != nil; c = c.NextSibling {44 links = visit(links, c)45 }46}47import (

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1import (2func main() {3 if err != nil {4 log.Fatal(err)5 }6 defer resp.Body.Close()7 doc, err := html.Parse(resp.Body)8 if err != nil {9 log.Fatal(err)10 }11 forEachNode(doc, startElement, endElement)12}13func forEachNode(n *html.Node, pre, post func(n *html.Node)) {14 if pre != nil {15 pre(n)16 }17 for c := n.FirstChild; c != nil; c = c.NextSibling {18 forEachNode(c, pre, post)19 }20 if post != nil {21 post(n)22 }23}24func startElement(n *html.Node) {25 if n.Type == html.ElementNode {26 fmt.Printf("<%s", n.Data)27 for _, a := range n.Attr {28 fmt.Printf(" %s='%s'", a.Key, a.Val)29 }30 fmt.Printf(">\n")31 }32}33func endElement(n *html.Node) {34 if n.Type == html.ElementNode {35 fmt.Printf("</%s>\n", n.Data)36 }37}

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1import (2func main() {3 if err != nil {4 fmt.Println(err)5 }6 defer resp.Body.Close()7 doc, err := html.Parse(resp.Body)8 if err != nil {9 fmt.Println(err)10 }11 var f func(*html.Node)12 f = func(n *html.Node) {13 if n.Type == html.ElementNode {14 fmt.Println(n.Data)15 }16 for c := n.FirstChild; c != nil; c = c.NextSibling {17 f(c)18 }19 }20 f(doc)21}22import (23func main() {24 if err != nil {25 fmt.Println(err)26 }27 defer resp.Body.Close()28 doc, err := html.Parse(resp.Body)29 if err != nil {30 fmt.Println(err)31 }

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