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README
¶
HTML 
This package is an HTML5 lexer written in Go. It follows the specification at The HTML syntax. The lexer takes an io.Reader and converts it into tokens until the EOF.
Installation
Run the following command
go get github.com/tdewolff/parse/html
or add the following import and run project with go get
import "github.com/tdewolff/parse/html"
Lexer
Usage
The following initializes a new Lexer with io.Reader r:
l := html.NewLexer(r)
To tokenize until EOF an error, use:
for {
tt, data := l.Next()
switch tt {
case html.ErrorToken:
// error or EOF set in l.Err()
return
case html.StartTagToken:
// ...
for {
ttAttr, dataAttr := l.Next()
if ttAttr != html.AttributeToken {
break
}
// ...
}
// ...
}
}
All tokens:
ErrorToken TokenType = iota // extra token when errors occur
CommentToken
DoctypeToken
StartTagToken
StartTagCloseToken
StartTagVoidToken
EndTagToken
AttributeToken
TextToken
Examples
package main
import (
"os"
"github.com/tdewolff/parse/html"
)
// Tokenize HTML from stdin.
func main() {
l := html.NewLexer(os.Stdin)
for {
tt, data := l.Next()
switch tt {
case html.ErrorToken:
if l.Err() != io.EOF {
fmt.Println("Error on line", l.Line(), ":", l.Err())
}
return
case html.StartTagToken:
fmt.Println("Tag", string(data))
for {
ttAttr, dataAttr := l.Next()
if ttAttr != html.AttributeToken {
break
}
key := dataAttr
val := l.AttrVal()
fmt.Println("Attribute", string(key), "=", string(val))
}
// ...
}
}
}
License
Released under the MIT license.
Documentation
¶
Overview ¶
Package html is an HTML5 lexer following the specifications at http://www.w3.org/TR/html5/syntax.html.
Index ¶
Examples ¶
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
func EscapeAttrVal ¶
EscapeAttrVal returns the escaped attribute value bytes without quotes.
Types ¶
type Hash ¶
type Hash uint32
Hash defines perfect hashes for a predefined list of strings
const ( A Hash = 0x1 // a Abbr Hash = 0x4 // abbr Accept Hash = 0x3206 // accept Accept_Charset Hash = 0x320e // accept-charset Accesskey Hash = 0x4409 // accesskey Acronym Hash = 0xbb07 // acronym Action Hash = 0x2ba06 // action Address Hash = 0x67e07 // address Align Hash = 0x1605 // align Alink Hash = 0xd205 // alink Allowfullscreen Hash = 0x23d0f // allowfullscreen Alt Hash = 0xee03 // alt Annotation Hash = 0x2070a // annotation AnnotationXml Hash = 0x2070d // annotationXml Applet Hash = 0x14506 // applet Area Hash = 0x38d04 // area Article Hash = 0x40e07 // article Aside Hash = 0x8305 // aside Async Hash = 0xfa05 // async Audio Hash = 0x11605 // audio Autocomplete Hash = 0x12e0c // autocomplete Autofocus Hash = 0x13a09 // autofocus Autoplay Hash = 0x14f08 // autoplay Axis Hash = 0x15704 // axis B Hash = 0x101 // b Background Hash = 0x1e0a // background Base Hash = 0x45404 // base Basefont Hash = 0x45408 // basefont Bdi Hash = 0xcb03 // bdi Bdo Hash = 0x18403 // bdo Bgcolor Hash = 0x19707 // bgcolor Bgsound Hash = 0x19e07 // bgsound Big Hash = 0x1a603 // big Blink Hash = 0x1a905 // blink Blockquote Hash = 0x1ae0a // blockquote Body Hash = 0x4004 // body Border Hash = 0x33806 // border Br Hash = 0x202 // br Button Hash = 0x1b806 // button Canvas Hash = 0x7f06 // canvas Caption Hash = 0x27f07 // caption Center Hash = 0x62a06 // center Challenge Hash = 0x1e509 // challenge Charset Hash = 0x3907 // charset Checked Hash = 0x3b407 // checked Cite Hash = 0xfe04 // cite Class Hash = 0x1c305 // class Classid Hash = 0x1c307 // classid Clear Hash = 0x41205 // clear Code Hash = 0x1d604 // code Codebase Hash = 0x45008 // codebase Codetype Hash = 0x1d608 // codetype Col Hash = 0x19903 // col Colgroup Hash = 0x1ee08 // colgroup Color Hash = 0x19905 // color Cols Hash = 0x20204 // cols Colspan Hash = 0x20207 // colspan Command Hash = 0x21407 // command Compact Hash = 0x21b07 // compact Content Hash = 0x4a907 // content Contenteditable Hash = 0x4a90f // contenteditable Controls Hash = 0x22a08 // controls Coords Hash = 0x23606 // coords Crossorigin Hash = 0x25b0b // crossorigin Data Hash = 0x4c004 // data Datalist Hash = 0x4c008 // datalist Datetime Hash = 0x2ea08 // datetime Dd Hash = 0x31602 // dd Declare Hash = 0x8607 // declare Default Hash = 0x5407 // default DefaultChecked Hash = 0x5040e // defaultChecked DefaultMuted Hash = 0x5650c // defaultMuted DefaultSelected Hash = 0x540f // defaultSelected Defer Hash = 0x6205 // defer Del Hash = 0x7203 // del Desc Hash = 0x7c04 // desc Details Hash = 0x9207 // details Dfn Hash = 0xab03 // dfn Dialog Hash = 0xcc06 // dialog Dir Hash = 0xd903 // dir Dirname Hash = 0xd907 // dirname Disabled Hash = 0x10408 // disabled Div Hash = 0x10b03 // div Dl Hash = 0x1a402 // dl Download Hash = 0x48608 // download Draggable Hash = 0x1c909 // draggable Dropzone Hash = 0x41908 // dropzone Dt Hash = 0x60602 // dt Em Hash = 0x6e02 // em Embed Hash = 0x6e05 // embed Enabled Hash = 0x4e07 // enabled Enctype Hash = 0x2cf07 // enctype Face Hash = 0x62804 // face Fieldset Hash = 0x26c08 // fieldset Figcaption Hash = 0x27c0a // figcaption Figure Hash = 0x29006 // figure Font Hash = 0x45804 // font For Hash = 0x29c03 // for ForeignObject Hash = 0x29c0d // foreignObject Foreignobject Hash = 0x2a90d // foreignobject Form Hash = 0x2b604 // form Formaction Hash = 0x2b60a // formaction Formenctype Hash = 0x2cb0b // formenctype Formmethod Hash = 0x2d60a // formmethod Formnovalidate Hash = 0x2e00e // formnovalidate Formtarget Hash = 0x2f50a // formtarget Frame Hash = 0xa305 // frame Frameborder Hash = 0x3330b // frameborder Frameset Hash = 0xa308 // frameset H1 Hash = 0x19502 // h1 H2 Hash = 0x32402 // h2 H3 Hash = 0x34902 // h3 H4 Hash = 0x38602 // h4 H5 Hash = 0x60802 // h5 H6 Hash = 0x2ff02 // h6 Head Hash = 0x37204 // head Header Hash = 0x37206 // header Headers Hash = 0x37207 // headers Height Hash = 0x30106 // height Hgroup Hash = 0x30906 // hgroup Hidden Hash = 0x31406 // hidden High Hash = 0x32104 // high Hr Hash = 0xaf02 // hr Href Hash = 0xaf04 // href Hreflang Hash = 0xaf08 // hreflang Html Hash = 0x30504 // html Http_Equiv Hash = 0x3260a // http-equiv I Hash = 0x601 // i Icon Hash = 0x4a804 // icon Id Hash = 0x8502 // id Iframe Hash = 0x33206 // iframe Image Hash = 0x33e05 // image Img Hash = 0x34303 // img Inert Hash = 0x55005 // inert Input Hash = 0x47305 // input Ins Hash = 0x26403 // ins Isindex Hash = 0x15907 // isindex Ismap Hash = 0x34b05 // ismap Itemid Hash = 0xff06 // itemid Itemprop Hash = 0x58808 // itemprop Itemref Hash = 0x62207 // itemref Itemscope Hash = 0x35609 // itemscope Itemtype Hash = 0x36008 // itemtype Kbd Hash = 0xca03 // kbd Keygen Hash = 0x4a06 // keygen Keytype Hash = 0x68807 // keytype Kind Hash = 0xd604 // kind Label Hash = 0x7405 // label Lang Hash = 0xb304 // lang Language Hash = 0xb308 // language Legend Hash = 0x1d006 // legend Li Hash = 0x1702 // li Link Hash = 0xd304 // link List Hash = 0x4c404 // list Listing Hash = 0x4c407 // listing Longdesc Hash = 0x7808 // longdesc Loop Hash = 0x12104 // loop Low Hash = 0x23f03 // low Main Hash = 0x1004 // main Malignmark Hash = 0xc10a // malignmark Manifest Hash = 0x65e08 // manifest Map Hash = 0x14403 // map Mark Hash = 0xc704 // mark Marquee Hash = 0x36807 // marquee Math Hash = 0x36f04 // math Max Hash = 0x37e03 // max Maxlength Hash = 0x37e09 // maxlength Media Hash = 0xde05 // media Mediagroup Hash = 0xde0a // mediagroup Menu Hash = 0x3c404 // menu Meta Hash = 0x4d304 // meta Meter Hash = 0x2f005 // meter Method Hash = 0x2da06 // method Mglyph Hash = 0x34406 // mglyph Mi Hash = 0x2c02 // mi Min Hash = 0x2c03 // min Mn Hash = 0x2e302 // mn Mo Hash = 0x4f702 // mo Ms Hash = 0x35902 // ms Mtext Hash = 0x38805 // mtext Multiple Hash = 0x39608 // multiple Muted Hash = 0x39e05 // muted Name Hash = 0xdc04 // name Nobr Hash = 0x1a04 // nobr Noembed Hash = 0x6c07 // noembed Noframes Hash = 0xa108 // noframes Nohref Hash = 0xad06 // nohref Noresize Hash = 0x24b08 // noresize Noscript Hash = 0x31908 // noscript Noshade Hash = 0x4ff07 // noshade Novalidate Hash = 0x2e40a // novalidate Nowrap Hash = 0x59106 // nowrap Object Hash = 0x2b006 // object Ol Hash = 0x17102 // ol Onabort Hash = 0x1bc07 // onabort Onafterprint Hash = 0x2840c // onafterprint Onbeforeprint Hash = 0x2be0d // onbeforeprint Onbeforeunload Hash = 0x6720e // onbeforeunload Onblur Hash = 0x17e06 // onblur Oncancel Hash = 0x11a08 // oncancel Oncanplay Hash = 0x18609 // oncanplay Oncanplaythrough Hash = 0x18610 // oncanplaythrough Onchange Hash = 0x42f08 // onchange Onclick Hash = 0x6b607 // onclick Onclose Hash = 0x3a307 // onclose Oncuechange Hash = 0x3c80b // oncuechange Ondblclick Hash = 0x3d30a // ondblclick Ondrag Hash = 0x3dd06 // ondrag Ondragend Hash = 0x3dd09 // ondragend Ondragenter Hash = 0x3e60b // ondragenter Ondragleave Hash = 0x3f10b // ondragleave Ondragover Hash = 0x3fc0a // ondragover Ondragstart Hash = 0x4060b // ondragstart Ondrop Hash = 0x41706 // ondrop Ondurationchange Hash = 0x42710 // ondurationchange Onemptied Hash = 0x41e09 // onemptied Onended Hash = 0x43707 // onended Onerror Hash = 0x43e07 // onerror Onfocus Hash = 0x44507 // onfocus Onhashchange Hash = 0x4650c // onhashchange Oninput Hash = 0x47107 // oninput Oninvalid Hash = 0x47809 // oninvalid Onkeydown Hash = 0x48109 // onkeydown Onkeypress Hash = 0x48e0a // onkeypress Onkeyup Hash = 0x49e07 // onkeyup Onload Hash = 0x4b806 // onload Onloadeddata Hash = 0x4b80c // onloadeddata Onloadedmetadata Hash = 0x4cb10 // onloadedmetadata Onloadstart Hash = 0x4e10b // onloadstart Onmessage Hash = 0x4ec09 // onmessage Onmousedown Hash = 0x4f50b // onmousedown Onmousemove Hash = 0x5120b // onmousemove Onmouseout Hash = 0x51d0a // onmouseout Onmouseover Hash = 0x52a0b // onmouseover Onmouseup Hash = 0x53509 // onmouseup Onmousewheel Hash = 0x53e0c // onmousewheel Onoffline Hash = 0x54a09 // onoffline Ononline Hash = 0x55508 // ononline Onpagehide Hash = 0x55d0a // onpagehide Onpageshow Hash = 0x5710a // onpageshow Onpause Hash = 0x57d07 // onpause Onplay Hash = 0x59c06 // onplay Onplaying Hash = 0x59c09 // onplaying Onpopstate Hash = 0x5a50a // onpopstate Onprogress Hash = 0x5af0a // onprogress Onratechange Hash = 0x5be0c // onratechange Onreset Hash = 0x5ca07 // onreset Onresize Hash = 0x5d108 // onresize Onscroll Hash = 0x5d908 // onscroll Onseeked Hash = 0x5e408 // onseeked Onseeking Hash = 0x5ec09 // onseeking Onselect Hash = 0x5f508 // onselect Onshow Hash = 0x5ff06 // onshow Onstalled Hash = 0x60a09 // onstalled Onstorage Hash = 0x61309 // onstorage Onsubmit Hash = 0x61c08 // onsubmit Onsuspend Hash = 0x63009 // onsuspend Ontimeupdate Hash = 0x4590c // ontimeupdate Onunload Hash = 0x63908 // onunload Onvolumechange Hash = 0x6410e // onvolumechange Onwaiting Hash = 0x64f09 // onwaiting Open Hash = 0x58e04 // open Optgroup Hash = 0x12308 // optgroup Optimum Hash = 0x65807 // optimum Option Hash = 0x66e06 // option Output Hash = 0x52406 // output P Hash = 0xc01 // p Param Hash = 0xc05 // param Pattern Hash = 0x9b07 // pattern Pauseonexit Hash = 0x57f0b // pauseonexit Picture Hash = 0xe707 // picture Ping Hash = 0x12a04 // ping Placeholder Hash = 0x16b0b // placeholder Plaintext Hash = 0x1f509 // plaintext Poster Hash = 0x30e06 // poster Pre Hash = 0x34f03 // pre Preload Hash = 0x34f07 // preload Profile Hash = 0x66707 // profile Progress Hash = 0x5b108 // progress Prompt Hash = 0x59606 // prompt Public Hash = 0x4a406 // public Q Hash = 0x8d01 // q Radiogroup Hash = 0x30a // radiogroup Rb Hash = 0x1d02 // rb Readonly Hash = 0x38e08 // readonly Rel Hash = 0x35003 // rel Required Hash = 0x8b08 // required Rev Hash = 0x29403 // rev Reversed Hash = 0x29408 // reversed Rows Hash = 0x6604 // rows Rowspan Hash = 0x6607 // rowspan Rp Hash = 0x28a02 // rp Rt Hash = 0x1c102 // rt Rtc Hash = 0x1c103 // rtc Ruby Hash = 0xf604 // ruby Rules Hash = 0x17505 // rules S Hash = 0x3d01 // s Samp Hash = 0x9804 // samp Sandbox Hash = 0x16307 // sandbox Scope Hash = 0x35a05 // scope Scoped Hash = 0x35a06 // scoped Script Hash = 0x31b06 // script Scrolling Hash = 0x5db09 // scrolling Seamless Hash = 0x3a808 // seamless Section Hash = 0x17907 // section Select Hash = 0x5f706 // select Selected Hash = 0x5f708 // selected Shape Hash = 0x23105 // shape Size Hash = 0x24f04 // size Sizes Hash = 0x24f05 // sizes Small Hash = 0x23b05 // small Sortable Hash = 0x25308 // sortable Source Hash = 0x26606 // source Spacer Hash = 0x37806 // spacer Span Hash = 0x6904 // span Spellcheck Hash = 0x3af0a // spellcheck Src Hash = 0x44b03 // src Srcdoc Hash = 0x44b06 // srcdoc Srclang Hash = 0x49707 // srclang Srcset Hash = 0x5b806 // srcset Start Hash = 0x40c05 // start Step Hash = 0x66404 // step Strike Hash = 0x68406 // strike Strong Hash = 0x68f06 // strong Style Hash = 0x69505 // style Sub Hash = 0x61e03 // sub Summary Hash = 0x69a07 // summary Sup Hash = 0x6a103 // sup Svg Hash = 0x6a403 // svg System Hash = 0x6a706 // system Tabindex Hash = 0x4d908 // tabindex Table Hash = 0x25605 // table Target Hash = 0x2f906 // target Tbody Hash = 0x3f05 // tbody Td Hash = 0xaa02 // td Template Hash = 0x6aa08 // template Text Hash = 0x1fa04 // text Textarea Hash = 0x38908 // textarea Tfoot Hash = 0xf005 // tfoot Th Hash = 0x18f02 // th Thead Hash = 0x37105 // thead Time Hash = 0x2ee04 // time Title Hash = 0x14a05 // title Tr Hash = 0x1fd02 // tr Track Hash = 0x1fd05 // track Translate Hash = 0x22109 // translate Truespeed Hash = 0x27309 // truespeed Tt Hash = 0x9d02 // tt Type Hash = 0x11204 // type Typemustmatch Hash = 0x1da0d // typemustmatch U Hash = 0xb01 // u Ul Hash = 0x5802 // ul Undeterminate Hash = 0x250d // undeterminate Usemap Hash = 0x14106 // usemap Valign Hash = 0x1506 // valign Value Hash = 0x10d05 // value Valuetype Hash = 0x10d09 // valuetype Var Hash = 0x32f03 // var Video Hash = 0x6b205 // video Visible Hash = 0x6bd07 // visible Vlink Hash = 0x6c405 // vlink Wbr Hash = 0x57a03 // wbr Width Hash = 0x60405 // width Wrap Hash = 0x59304 // wrap Xmlns Hash = 0x15f05 // xmlns Xmp Hash = 0x16903 // xmp )
Unique hash definitions to be used instead of strings
type Lexer ¶
type Lexer struct {
// contains filtered or unexported fields
}
Lexer is the state for the lexer.
func NewLexer ¶
NewLexer returns a new Lexer for a given io.Reader.
Example ¶
l := NewLexer(bytes.NewBufferString("<span class='user'>John Doe</span>"))
out := ""
for {
tt, data := l.Next()
if tt == ErrorToken {
break
}
out += string(data)
}
fmt.Println(out)
Output: <span class='user'>John Doe</span>
func (*Lexer) AttrVal ¶
AttrVal returns the attribute value when an AttributeToken was returned from Next.
func (*Lexer) Err ¶
Err returns the error encountered during lexing, this is often io.EOF but also other errors can be returned.
func (*Lexer) Next ¶
Next returns the next Token. It returns ErrorToken when an error was encountered. Using Err() one can retrieve the error message.
type TokenType ¶
type TokenType uint32
TokenType determines the type of token, eg. a number or a semicolon.
Source Files
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