query

package module
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 Go to latest Published: May 5, 2018 License: BSD-2-Clause Imports: 10 Imported by: 0

README

html-query: A fluent and functional approach to querying HTML DOM

GoDoc

html-query is a Go package that provides a fluent and functional interface for querying HTML DOM. It is based on golang.org/x/net/html.

Examples

  1. A simple example (under "examples" directory)
    r := get(`http://blog.golang.org/index`)
    defer r.Close()
    root, err := query.Parse(r)
    checkError(err)
    root.Div(Id("content")).Children(Class("blogtitle")).For(func(item *query.Node) {
        href := item.Ahref().Href()
        date := item.Span(Class("date")).Text()
        tags := item.Span(Class("tags")).Text()
        // ......
    })

  1. Generator of html-query (under "gen" directory)

    A large part of html-query is automatically generated from HTML spec. The spec is in HTML format, so the generator parses it using html-query itself.

Design

Here is a simple explanation of the design of html-query.

Functional query expressions

All functional definitions are defined in html-query/expr package.

  1. Checker and checker composition

    A checker is a function that accept and conditionally returns a *html.Node.

    type Checker func(*html.Node) *html.Node

Here are some checker examples:

    Id("id1")
    Class("c1")
    Div
    Abbr
    H1
    H2

Checkers can be combined as boolean expressions:

    And(Id("id1"), Class("c1"))
    Or(Class("c1"), Class("c2"))
    And(Class("c1"), Not(Class("c2")))

  1. Checker builder

    A checker builder is a function that returns a checker. "Id", "Class", "And", "Or", "Not" shown above are all checker builders. There are also some checker builder builder (function that returns a checker builder) defined in html-query when needed.

Fluent interface

Fluent interface (http://en.wikipedia.org/wiki/Fluent_interface) are defined in html-query package.

  1. Root node

    Function Parse returns the root node of an html document.

  2. Node finder

    Method Node.Find implements a BFS search for a node, e.g.

    node.Find(Div, Class("id1"))

But usually you can write the short form:

    node.Div(Class("id1"))

  1. Attribute getter

    Method Node.Attr can be used to get the value (or a regular expression submatch of the value) of a node, e.g.

    node.Attr("Id")
    node.Attr("href", "\(.*)")

But usually you can write the short form:

    node.Id()
    node.Href("\(.*)")

  1. Node iterator

    Method Node.Children and Node.Descendants each returns a node iterator (NodeIter). Method NodeIter.For can be used to loop through these nodes.

Alternative

If you prefer a jquery like DSL rather than functional way, you might want to try goquery: https://github.com/PuerkitoBio/goquery.

Documentation

Overview

Package query provides a fluent and functional interface for querying HTML DOM using Go. It is based on golang.org/x/net/html.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

This section is empty.

Types

type Node 

type Node struct {
	// contains filtered or unexported fields
}

Node represents a HTML node. Wrap html.Node so that chainable interface is possible Use pointer of it because we want to test with nil.

func NewNode 

func NewNode(n *html.Node) *Node

func Parse 

func Parse(r io.Reader) (*Node, error)

func (*Node) A 

func (n *Node) A(cs ...Checker) *Node

func (*Node) Abbr 

func (n *Node) Abbr(cs ...Checker) *Node

func (*Node) Abbr_ 

func (n *Node) Abbr_(pat ...string) *string

func (*Node) Accept 

func (n *Node) Accept(pat ...string) *string

func (*Node) AcceptCharset 

func (n *Node) AcceptCharset(pat ...string) *string

func (*Node) Accesskey 

func (n *Node) Accesskey(pat ...string) *string

func (*Node) Action 

func (n *Node) Action(pat ...string) *string

func (*Node) Address 

func (n *Node) Address(cs ...Checker) *Node

func (*Node) Ahref 

func (n *Node) Ahref(cs ...Checker) *Node

func (*Node) AllText 

func (n *Node) AllText(pat ...string) *string

func (*Node) Allowfullscreen 

func (n *Node) Allowfullscreen(pat ...string) *string

func (*Node) Allowpaymentrequest 

func (n *Node) Allowpaymentrequest(pat ...string) *string

func (*Node) Allowusermedia 

func (n *Node) Allowusermedia(pat ...string) *string

func (*Node) Alt 

func (n *Node) Alt(pat ...string) *string

func (*Node) Area 

func (n *Node) Area(cs ...Checker) *Node

func (*Node) Article 

func (n *Node) Article(cs ...Checker) *Node

func (*Node) As 

func (n *Node) As(pat ...string) *string

func (*Node) Aside 

func (n *Node) Aside(cs ...Checker) *Node

func (*Node) Async 

func (n *Node) Async(pat ...string) *string

func (*Node) Attr 

func (n *Node) Attr(key string, pat ...string) *string

func (*Node) Audio 

func (n *Node) Audio(cs ...Checker) *Node

func (*Node) Autocomplete 

func (n *Node) Autocomplete(pat ...string) *string

func (*Node) Autofocus 

func (n *Node) Autofocus(pat ...string) *string

func (*Node) Autoplay 

func (n *Node) Autoplay(pat ...string) *string

func (*Node) B 

func (n *Node) B(cs ...Checker) *Node

func (*Node) Base 

func (n *Node) Base(cs ...Checker) *Node

func (*Node) Bdi 

func (n *Node) Bdi(cs ...Checker) *Node

func (*Node) Bdo 

func (n *Node) Bdo(cs ...Checker) *Node

func (*Node) Blockquote 

func (n *Node) Blockquote(cs ...Checker) *Node

func (*Node) Body 

func (n *Node) Body(cs ...Checker) *Node

func (*Node) Br 

func (n *Node) Br(cs ...Checker) *Node

func (*Node) Button 

func (n *Node) Button(cs ...Checker) *Node

func (*Node) Canvas 

func (n *Node) Canvas(cs ...Checker) *Node

func (*Node) Caption 

func (n *Node) Caption(cs ...Checker) *Node

func (*Node) Charset 

func (n *Node) Charset(pat ...string) *string

func (*Node) Checked 

func (n *Node) Checked(pat ...string) *string

func (*Node) Children 

func (n *Node) Children(cs ...Checker) NodeIter

func (*Node) Cite 

func (n *Node) Cite(cs ...Checker) *Node

func (*Node) Cite_ 

func (n *Node) Cite_(pat ...string) *string

func (*Node) Class 

func (n *Node) Class(pat ...string) *string

func (*Node) Code 

func (n *Node) Code(cs ...Checker) *Node

func (*Node) Col 

func (n *Node) Col(cs ...Checker) *Node

func (*Node) Colgroup 

func (n *Node) Colgroup(cs ...Checker) *Node

func (*Node) Color 

func (n *Node) Color(pat ...string) *string

func (*Node) Cols 

func (n *Node) Cols(pat ...string) *string

func (*Node) Colspan 

func (n *Node) Colspan(pat ...string) *string

func (*Node) Content 

func (n *Node) Content(pat ...string) *string

func (*Node) Contenteditable 

func (n *Node) Contenteditable(pat ...string) *string

func (*Node) Controls 

func (n *Node) Controls(pat ...string) *string

func (*Node) Coords 

func (n *Node) Coords(pat ...string) *string

func (*Node) Crossorigin 

func (n *Node) Crossorigin(pat ...string) *string

func (*Node) Data 

func (n *Node) Data(cs ...Checker) *Node

func (*Node) Data_ 

func (n *Node) Data_(pat ...string) *string

func (*Node) Datalist 

func (n *Node) Datalist(cs ...Checker) *Node

func (*Node) Datetime 

func (n *Node) Datetime(pat ...string) *string

func (*Node) Dd 

func (n *Node) Dd(cs ...Checker) *Node

func (*Node) Default 

func (n *Node) Default(pat ...string) *string

func (*Node) Defer 

func (n *Node) Defer(pat ...string) *string

func (*Node) Del 

func (n *Node) Del(cs ...Checker) *Node

func (*Node) Descendants 

func (n *Node) Descendants(cs ...Checker) NodeIter

func (*Node) Details 

func (n *Node) Details(cs ...Checker) *Node

func (*Node) Dfn 

func (n *Node) Dfn(cs ...Checker) *Node

func (*Node) Dialog 

func (n *Node) Dialog(cs ...Checker) *Node

func (*Node) Dir 

func (n *Node) Dir(pat ...string) *string

func (*Node) Dirname 

func (n *Node) Dirname(pat ...string) *string

func (*Node) Disabled 

func (n *Node) Disabled(pat ...string) *string

func (*Node) Div 

func (n *Node) Div(cs ...Checker) *Node

func (*Node) Dl 

func (n *Node) Dl(cs ...Checker) *Node

func (*Node) Download 

func (n *Node) Download(pat ...string) *string

func (*Node) Draggable 

func (n *Node) Draggable(pat ...string) *string

func (*Node) Dt 

func (n *Node) Dt(cs ...Checker) *Node

func (*Node) Em 

func (n *Node) Em(cs ...Checker) *Node

func (*Node) Embed 

func (n *Node) Embed(cs ...Checker) *Node

func (*Node) Enctype 

func (n *Node) Enctype(pat ...string) *string

func (*Node) Fieldset 

func (n *Node) Fieldset(cs ...Checker) *Node

func (*Node) Figcaption 

func (n *Node) Figcaption(cs ...Checker) *Node

func (*Node) Figure 

func (n *Node) Figure(cs ...Checker) *Node

func (*Node) Find 

func (n *Node) Find(cs ...Checker) *Node

func (*Node) FindChild 

func (n *Node) FindChild(cs ...Checker) *Node

func (*Node) FindNext 

func (n *Node) FindNext(cs ...Checker) *Node

func (*Node) Footer 

func (n *Node) Footer(cs ...Checker) *Node

func (*Node) For 

func (n *Node) For(pat ...string) *string

func (*Node) Form 

func (n *Node) Form(cs ...Checker) *Node

func (*Node) Form_ 

func (n *Node) Form_(pat ...string) *string

func (*Node) Formaction 

func (n *Node) Formaction(pat ...string) *string

func (*Node) Formenctype 

func (n *Node) Formenctype(pat ...string) *string

func (*Node) Formmethod 

func (n *Node) Formmethod(pat ...string) *string

func (*Node) Formnovalidate 

func (n *Node) Formnovalidate(pat ...string) *string

func (*Node) Formtarget 

func (n *Node) Formtarget(pat ...string) *string

func (*Node) H1 

func (n *Node) H1(cs ...Checker) *Node

func (*Node) H2 

func (n *Node) H2(cs ...Checker) *Node

func (*Node) H3 

func (n *Node) H3(cs ...Checker) *Node

func (*Node) H4 

func (n *Node) H4(cs ...Checker) *Node

func (*Node) H5 

func (n *Node) H5(cs ...Checker) *Node

func (*Node) H6 

func (n *Node) H6(cs ...Checker) *Node

func (*Node) Head 

func (n *Node) Head(cs ...Checker) *Node

func (*Node) Header 

func (n *Node) Header(cs ...Checker) *Node

func (*Node) Headers 

func (n *Node) Headers(pat ...string) *string

func (*Node) Height 

func (n *Node) Height(pat ...string) *string

func (*Node) Hgroup 

func (n *Node) Hgroup(cs ...Checker) *Node

func (*Node) Hidden 

func (n *Node) Hidden(pat ...string) *string

func (*Node) High 

func (n *Node) High(pat ...string) *string

func (*Node) Hr 

func (n *Node) Hr(cs ...Checker) *Node

func (*Node) Href 

func (n *Node) Href(pat ...string) *string

func (*Node) Hreflang 

func (n *Node) Hreflang(pat ...string) *string

func (*Node) Html 

func (n *Node) Html(cs ...Checker) *Node

func (*Node) HttpEquiv 

func (n *Node) HttpEquiv(pat ...string) *string

func (*Node) I 

func (n *Node) I(cs ...Checker) *Node

func (*Node) Id 

func (n *Node) Id(pat ...string) *string

func (*Node) Iframe 

func (n *Node) Iframe(cs ...Checker) *Node

func (*Node) Img 

func (n *Node) Img(cs ...Checker) *Node

func (*Node) Input 

func (n *Node) Input(cs ...Checker) *Node

func (*Node) Inputmode 

func (n *Node) Inputmode(pat ...string) *string

func (*Node) Ins 

func (n *Node) Ins(cs ...Checker) *Node

func (*Node) Integrity 

func (n *Node) Integrity(pat ...string) *string

func (*Node) InternalNode 

func (n *Node) InternalNode() *html.Node

func (*Node) Is 

func (n *Node) Is(pat ...string) *string

func (*Node) Ismap 

func (n *Node) Ismap(pat ...string) *string

func (*Node) Itemid 

func (n *Node) Itemid(pat ...string) *string

func (*Node) Itemprop 

func (n *Node) Itemprop(pat ...string) *string

func (*Node) Itemref 

func (n *Node) Itemref(pat ...string) *string

func (*Node) Itemscope 

func (n *Node) Itemscope(pat ...string) *string

func (*Node) Itemtype 

func (n *Node) Itemtype(pat ...string) *string

func (*Node) Kbd 

func (n *Node) Kbd(cs ...Checker) *Node

func (*Node) Kind 

func (n *Node) Kind(pat ...string) *string

func (*Node) Label 

func (n *Node) Label(cs ...Checker) *Node

func (*Node) Label_ 

func (n *Node) Label_(pat ...string) *string

func (*Node) Lang 

func (n *Node) Lang(pat ...string) *string

func (*Node) Legend 

func (n *Node) Legend(cs ...Checker) *Node

func (*Node) Li 

func (n *Node) Li(cs ...Checker) *Node
func (n *Node) Link(cs ...Checker) *Node

func (*Node) List 

func (n *Node) List(pat ...string) *string

func (*Node) Loop 

func (n *Node) Loop(pat ...string) *string

func (*Node) Low 

func (n *Node) Low(pat ...string) *string

func (*Node) Manifest 

func (n *Node) Manifest(pat ...string) *string

func (*Node) Map 

func (n *Node) Map(cs ...Checker) *Node

func (*Node) Mark 

func (n *Node) Mark(cs ...Checker) *Node

func (*Node) Max 

func (n *Node) Max(pat ...string) *string

func (*Node) Maxlength 

func (n *Node) Maxlength(pat ...string) *string

func (*Node) Media 

func (n *Node) Media(pat ...string) *string

func (*Node) Menu 

func (n *Node) Menu(cs ...Checker) *Node

func (*Node) Meta 

func (n *Node) Meta(cs ...Checker) *Node

func (*Node) Meter 

func (n *Node) Meter(cs ...Checker) *Node

func (*Node) Method 

func (n *Node) Method(pat ...string) *string

func (*Node) Min 

func (n *Node) Min(pat ...string) *string

func (*Node) Minlength 

func (n *Node) Minlength(pat ...string) *string

func (*Node) Multiple 

func (n *Node) Multiple(pat ...string) *string

func (*Node) Muted 

func (n *Node) Muted(pat ...string) *string

func (*Node) Name 

func (n *Node) Name(pat ...string) *string

func (*Node) Nav 

func (n *Node) Nav(cs ...Checker) *Node

func (*Node) NextSibling 

func (n *Node) NextSibling() *Node

func (*Node) Nomodule 

func (n *Node) Nomodule(pat ...string) *string

func (*Node) Nonce 

func (n *Node) Nonce(pat ...string) *string

func (*Node) Noscript 

func (n *Node) Noscript(cs ...Checker) *Node

func (*Node) Novalidate 

func (n *Node) Novalidate(pat ...string) *string

func (*Node) Object 

func (n *Node) Object(cs ...Checker) *Node

func (*Node) Ol 

func (n *Node) Ol(cs ...Checker) *Node

func (*Node) Open 

func (n *Node) Open(pat ...string) *string

func (*Node) Optgroup 

func (n *Node) Optgroup(cs ...Checker) *Node

func (*Node) Optimum 

func (n *Node) Optimum(pat ...string) *string

func (*Node) Option 

func (n *Node) Option(cs ...Checker) *Node

func (*Node) Output 

func (n *Node) Output(cs ...Checker) *Node

func (*Node) P 

func (n *Node) P(cs ...Checker) *Node

func (*Node) Param 

func (n *Node) Param(cs ...Checker) *Node

func (*Node) Parent 

func (n *Node) Parent() *Node

func (*Node) Pattern 

func (n *Node) Pattern(pat ...string) *string

func (*Node) Ping 

func (n *Node) Ping(pat ...string) *string

func (*Node) Placeholder 

func (n *Node) Placeholder(pat ...string) *string

func (*Node) PlainText 

func (n *Node) PlainText() *string

func (*Node) Playsinline 

func (n *Node) Playsinline(pat ...string) *string

func (*Node) Poster 

func (n *Node) Poster(pat ...string) *string

func (*Node) Pre 

func (n *Node) Pre(cs ...Checker) *Node

func (*Node) Preload 

func (n *Node) Preload(pat ...string) *string

func (*Node) PrettyPrint 

func (n *Node) PrettyPrint()

func (*Node) PrettyRender 

func (n *Node) PrettyRender(w io.Writer, indentSize int) error

PrettyRender renders prettily the parse tree n to the given writer, for easily viewing as plain text.

func (*Node) PrevSibling 

func (n *Node) PrevSibling() *Node

func (*Node) Progress 

func (n *Node) Progress(cs ...Checker) *Node

func (*Node) Q 

func (n *Node) Q(cs ...Checker) *Node

func (*Node) Readonly 

func (n *Node) Readonly(pat ...string) *string

func (*Node) Referrerpolicy 

func (n *Node) Referrerpolicy(pat ...string) *string

func (*Node) Rel 

func (n *Node) Rel(pat ...string) *string

func (*Node) Render 

func (n *Node) Render() *string

func (*Node) RenderChildren 

func (n *Node) RenderChildren() *string

func (*Node) RenderTagOnly 

func (n *Node) RenderTagOnly() *string

func (*Node) Required 

func (n *Node) Required(pat ...string) *string

func (*Node) Reversed 

func (n *Node) Reversed(pat ...string) *string

func (*Node) Rows 

func (n *Node) Rows(pat ...string) *string

func (*Node) Rowspan 

func (n *Node) Rowspan(pat ...string) *string

func (*Node) Rp 

func (n *Node) Rp(cs ...Checker) *Node

func (*Node) Rt 

func (n *Node) Rt(cs ...Checker) *Node

func (*Node) Ruby 

func (n *Node) Ruby(cs ...Checker) *Node

func (*Node) S 

func (n *Node) S(cs ...Checker) *Node

func (*Node) Samp 

func (n *Node) Samp(cs ...Checker) *Node

func (*Node) Sandbox 

func (n *Node) Sandbox(pat ...string) *string

func (*Node) Satisfy 

func (n *Node) Satisfy(cs ...Checker) bool

func (*Node) Scope 

func (n *Node) Scope(pat ...string) *string

func (*Node) Script 

func (n *Node) Script(cs ...Checker) *Node

func (*Node) Section 

func (n *Node) Section(cs ...Checker) *Node

func (*Node) Select 

func (n *Node) Select(cs ...Checker) *Node

func (*Node) Selected 

func (n *Node) Selected(pat ...string) *string

func (*Node) Shape 

func (n *Node) Shape(pat ...string) *string

func (*Node) Size 

func (n *Node) Size(pat ...string) *string

func (*Node) Sizes 

func (n *Node) Sizes(pat ...string) *string

func (*Node) Slot_ 

func (n *Node) Slot_(pat ...string) *string

func (*Node) Small 

func (n *Node) Small(cs ...Checker) *Node

func (*Node) Source 

func (n *Node) Source(cs ...Checker) *Node

func (*Node) Span 

func (n *Node) Span(cs ...Checker) *Node

func (*Node) Span_ 

func (n *Node) Span_(pat ...string) *string

func (*Node) Spellcheck 

func (n *Node) Spellcheck(pat ...string) *string

func (*Node) Src 

func (n *Node) Src(pat ...string) *string

func (*Node) Srcdoc 

func (n *Node) Srcdoc(pat ...string) *string

func (*Node) Srclang 

func (n *Node) Srclang(pat ...string) *string

func (*Node) Srcset 

func (n *Node) Srcset(pat ...string) *string

func (*Node) Start 

func (n *Node) Start(pat ...string) *string

func (*Node) Step 

func (n *Node) Step(pat ...string) *string

func (*Node) Strong 

func (n *Node) Strong(cs ...Checker) *Node

func (*Node) Style 

func (n *Node) Style(cs ...Checker) *Node

func (*Node) Style_ 

func (n *Node) Style_(pat ...string) *string

func (*Node) Sub 

func (n *Node) Sub(cs ...Checker) *Node

func (*Node) Summary 

func (n *Node) Summary(cs ...Checker) *Node

func (*Node) Sup 

func (n *Node) Sup(cs ...Checker) *Node

func (*Node) Tabindex 

func (n *Node) Tabindex(pat ...string) *string

func (*Node) Table 

func (n *Node) Table(cs ...Checker) *Node

func (*Node) Target 

func (n *Node) Target(pat ...string) *string

func (*Node) Tbody 

func (n *Node) Tbody(cs ...Checker) *Node

func (*Node) Td 

func (n *Node) Td(cs ...Checker) *Node

func (*Node) Text 

func (n *Node) Text(pat ...string) *string

func (*Node) TextNode 

func (n *Node) TextNode(pat string) *TextNodeNode

func (*Node) Textarea 

func (n *Node) Textarea(cs ...Checker) *Node

func (*Node) Tfoot 

func (n *Node) Tfoot(cs ...Checker) *Node

func (*Node) Th 

func (n *Node) Th(cs ...Checker) *Node

func (*Node) Thead 

func (n *Node) Thead(cs ...Checker) *Node

func (*Node) Time 

func (n *Node) Time(cs ...Checker) *Node

func (*Node) Title 

func (n *Node) Title(cs ...Checker) *Node

func (*Node) Title_ 

func (n *Node) Title_(pat ...string) *string

func (*Node) Tr 

func (n *Node) Tr(cs ...Checker) *Node

func (*Node) Track 

func (n *Node) Track(cs ...Checker) *Node

func (*Node) Translate 

func (n *Node) Translate(pat ...string) *string

func (*Node) Type 

func (n *Node) Type(pat ...string) *string

func (*Node) Typemustmatch 

func (n *Node) Typemustmatch(pat ...string) *string

func (*Node) U 

func (n *Node) U(cs ...Checker) *Node

func (*Node) Ul 

func (n *Node) Ul(cs ...Checker) *Node

func (*Node) Updateviacache 

func (n *Node) Updateviacache(pat ...string) *string

func (*Node) Usemap 

func (n *Node) Usemap(pat ...string) *string

func (*Node) Value 

func (n *Node) Value(pat ...string) *string

func (*Node) Var 

func (n *Node) Var(cs ...Checker) *Node

func (*Node) Video 

func (n *Node) Video(cs ...Checker) *Node

func (*Node) Wbr 

func (n *Node) Wbr(cs ...Checker) *Node

func (*Node) Width 

func (n *Node) Width(pat ...string) *string

func (*Node) Workertype 

func (n *Node) Workertype(pat ...string) *string

func (*Node) Wrap 

func (n *Node) Wrap(pat ...string) *string

type NodeIter 

type NodeIter struct {
	Iter
}

func (NodeIter) A 

func (i NodeIter) A(cs ...Checker) NodeIter

func (NodeIter) All 

func (i NodeIter) All() (nodes []*Node)

func (NodeIter) Div 

func (i NodeIter) Div(cs ...Checker) NodeIter

func (NodeIter) Find 

func (i NodeIter) Find(cs ...Checker) NodeIter

func (NodeIter) For 

func (i NodeIter) For(visit func(n *Node))

func (NodeIter) H2 

func (i NodeIter) H2(cs ...Checker) NodeIter

func (NodeIter) H3 

func (i NodeIter) H3(cs ...Checker) NodeIter

func (NodeIter) H4 

func (i NodeIter) H4(cs ...Checker) NodeIter

func (NodeIter) Href 

func (i NodeIter) Href(pat ...string) []string

func (NodeIter) Integers 

func (i NodeIter) Integers(f StringGetter) []int

func (NodeIter) Next 

func (i NodeIter) Next() *Node

func (NodeIter) Strings 

func (i NodeIter) Strings(f StringGetter, pat ...string) []string

func (NodeIter) Td 

func (i NodeIter) Td(cs ...Checker) NodeIter

type NodeStack 

type NodeStack struct {
	*Stack
}

type TextNodeNode 

type TextNodeNode struct {
	Node
	// contains filtered or unexported fields
}

func NewTextNodeNode 

func NewTextNodeNode(n *Node, rx *regexp.Regexp) *TextNodeNode

func (*TextNodeNode) Submatch 

func (n *TextNodeNode) Submatch() *string

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