goldmark v1.1.19 -> v1.1.23 (#10519)

vendor update

go.mod

@@ -96,7 +96,7 @@ require (
 	github.com/unknwon/paginater v0.0.0-20151104151617-7748a72e0141
 	github.com/urfave/cli v1.20.0
 	github.com/yohcop/openid-go v0.0.0-20160914080427-2c050d2dae53
-	github.com/yuin/goldmark v1.1.19
+	github.com/yuin/goldmark v1.1.23
 	go.etcd.io/bbolt v1.3.3 // indirect
 	golang.org/x/crypto v0.0.0-20200221231518-2aa609cf4a9d
 	golang.org/x/net v0.0.0-20200114155413-6afb5195e5aa

go.sum

@@ -574,8 +574,8 @@ github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2/go.mod h1:UETIi67q
 github.com/xordataexchange/crypt v0.0.3-0.20170626215501-b2862e3d0a77/go.mod h1:aYKd//L2LvnjZzWKhF00oedf4jCCReLcmhLdhm1A27Q=
 github.com/yohcop/openid-go v0.0.0-20160914080427-2c050d2dae53 h1:HsIQ6yAjfjQ3IxPGrTusxp6Qxn92gNVq2x5CbvQvx3w=
 github.com/yohcop/openid-go v0.0.0-20160914080427-2c050d2dae53/go.mod h1:f6elajwZV+xceiaqgRL090YzLEDGSbqr3poGL3ZgXYo=
-github.com/yuin/goldmark v1.1.19 h1:0s2/60x0XsFCXHeFut+F3azDVAAyIMyUfJRbRexiTYs=
-github.com/yuin/goldmark v1.1.19/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
+github.com/yuin/goldmark v1.1.23 h1:eTodJ8hwEUvwXhb9qxQNuL/q1d+xMQClrXR4mdvV7gs=
+github.com/yuin/goldmark v1.1.23/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/ziutek/mymysql v1.5.4 h1:GB0qdRGsTwQSBVYuVShFBKaXSnSnYYC2d9knnE1LHFs=
 github.com/ziutek/mymysql v1.5.4/go.mod h1:LMSpPZ6DbqWFxNCHW77HeMg9I646SAhApZ/wKdgO/C0=
 go.etcd.io/bbolt v1.3.2/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=

vendor/github.com/yuin/goldmark/README.md

@@ -6,48 +6,48 @@ goldmark
 [![https://coveralls.io/github/yuin/goldmark](https://coveralls.io/repos/github/yuin/goldmark/badge.svg?branch=master)](https://coveralls.io/github/yuin/goldmark)
 [![https://goreportcard.com/report/github.com/yuin/goldmark](https://goreportcard.com/badge/github.com/yuin/goldmark)](https://goreportcard.com/report/github.com/yuin/goldmark)
 
-> A Markdown parser written in Go. Easy to extend, standard compliant, well structured.
+> A Markdown parser written in Go. Easy to extend, standards-compliant, well-structured.
 
 goldmark is compliant with CommonMark 0.29.
 
 Motivation
 ----------------------
-I need a Markdown parser for Go that meets following conditions:
+I needed a Markdown parser for Go that satisfies the following requirements:
 
 - Easy to extend.
-    - Markdown is poor in document expressions compared with other light markup languages like reStructuredText.
+    - Markdown is poor in document expressions compared to other light markup languages such as reStructuredText.
     - We have extensions to the Markdown syntax, e.g. PHP Markdown Extra, GitHub Flavored Markdown.
-- Standard compliant.
+- Standards-compliant.
     - Markdown has many dialects.
-    - GitHub Flavored Markdown is widely used and it is based on CommonMark aside from whether CommonMark is good specification or not.
-        - CommonMark is too complicated and hard to implement.
-- Well structured.
-    - AST based, and preserves source position of nodes.
+    - GitHub-Flavored Markdown is widely used and is based upon CommonMark, effectively mooting the question of whether or not CommonMark is an ideal specification.
+        - CommonMark is complicated and hard to implement.
+- Well-structured.
+    - AST-based; preserves source position of nodes.
 - Written in pure Go.
 
 [golang-commonmark](https://gitlab.com/golang-commonmark/markdown) may be a good choice, but it seems to be a copy of [markdown-it](https://github.com/markdown-it).
 
-[blackfriday.v2](https://github.com/russross/blackfriday/tree/v2) is a fast and widely used implementation, but it is not CommonMark compliant and cannot be extended from outside of the package since its AST uses structs instead of interfaces.
+[blackfriday.v2](https://github.com/russross/blackfriday/tree/v2) is a fast and widely-used implementation, but is not CommonMark-compliant and cannot be extended from outside of the package, since its AST uses structs instead of interfaces.
 
-Furthermore, its behavior differs from other implementations in some cases, especially regarding lists: ([Deep nested lists don't output correctly #329](https://github.com/russross/blackfriday/issues/329), [List block cannot have a second line #244](https://github.com/russross/blackfriday/issues/244), etc).
+Furthermore, its behavior differs from other implementations in some cases, especially regarding lists: [Deep nested lists don't output correctly #329](https://github.com/russross/blackfriday/issues/329), [List block cannot have a second line #244](https://github.com/russross/blackfriday/issues/244), etc.
 
-This behavior sometimes causes problems. If you migrate your Markdown text to blackfriday-based wikis from GitHub, many lists will immediately be broken.
+This behavior sometimes causes problems. If you migrate your Markdown text from GitHub to blackfriday-based wikis, many lists will immediately be broken.
 
-As mentioned above, CommonMark is too complicated and hard to implement, so Markdown parsers based on CommonMark barely exist.
+As mentioned above, CommonMark is complicated and hard to implement, so Markdown parsers based on CommonMark are few and far between.
 
 Features
 ----------------------
 
-- **Standard compliant.**  goldmark gets full compliance with the latest CommonMark spec.
+- **Standards-compliant.**  goldmark is fully compliant with the latest [CommonMark](https://commonmark.org/) specification.
 - **Extensible.**  Do you want to add a `@username` mention syntax to Markdown?
-  You can easily do it in goldmark. You can add your AST nodes,
-  parsers for block level elements, parsers for inline level elements,
-  transformers for paragraphs, transformers for whole AST structure, and
+  You can easily do so in goldmark. You can add your AST nodes,
+  parsers for block-level elements, parsers for inline-level elements,
+  transformers for paragraphs, transformers for the whole AST structure, and
   renderers.
-- **Performance.**  goldmark performs pretty much equally to cmark,
+- **Performance.**  goldmark's performance is on par with that of cmark,
   the CommonMark reference implementation written in C.
 - **Robust.**  goldmark is tested with [go-fuzz](https://github.com/dvyukov/go-fuzz), a fuzz testing tool.
-- **Builtin extensions.**  goldmark ships with common extensions like tables, strikethrough,
+- **Built-in extensions.**  goldmark ships with common extensions like tables, strikethrough,
   task lists, and definition lists.
 - **Depends only on standard libraries.**
 
@@ -62,7 +62,7 @@ Usage
 ----------------------
 Import packages:
 
-```
+```go
 import (
     "bytes"
     "github.com/yuin/goldmark"
@@ -70,7 +70,7 @@ import (
 ```
 
 
-Convert Markdown documents with the CommonMark compliant mode:
+Convert Markdown documents with the CommonMark-compliant mode:
 
 ```go
 var buf bytes.Buffer
@@ -128,6 +128,14 @@ if err := md.Convert(source, &buf); err != nil {
 }
 ```
 
+| Functional option | Type | Description |
+| ----------------- | ---- | ----------- |
+| `goldmark.WithParser` | `parser.Parser`  | This option must be passed before `goldmark.WithParserOptions` and `goldmark.WithExtensions` |
+| `goldmark.WithRenderer` | `renderer.Renderer`  | This option must be passed before `goldmark.WithRendererOptions` and `goldmark.WithExtensions`  |
+| `goldmark.WithParserOptions` | `...parser.Option`  |  |
+| `goldmark.WithRendererOptions` | `...renderer.Option` |  |
+| `goldmark.WithExtensions` | `...goldmark.Extender`  |  |
+
 Parser and Renderer options
 ------------------------------
 
@@ -147,9 +155,9 @@ Parser and Renderer options
 | Functional option | Type | Description |
 | ----------------- | ---- | ----------- |
 | `html.WithWriter` | `html.Writer` | `html.Writer` for writing contents to an `io.Writer`. |
-| `html.WithHardWraps` | `-` | Render new lines as `<br>`.|
+| `html.WithHardWraps` | `-` | Render newlines as `<br>`.|
 | `html.WithXHTML` | `-` | Render as XHTML. |
-| `html.WithUnsafe` | `-` | By default, goldmark does not render raw HTML and potentially dangerous links. With this option, goldmark renders these contents as written. |
+| `html.WithUnsafe` | `-` | By default, goldmark does not render raw HTML or potentially dangerous links. With this option, goldmark renders such content as written. |
 
 ### Built-in extensions
 
@@ -164,7 +172,7 @@ Parser and Renderer options
 - `extension.GFM`
     - This extension enables Table, Strikethrough, Linkify and TaskList.
     - This extension does not filter tags defined in [6.11: Disallowed Raw HTML (extension)](https://github.github.com/gfm/#disallowed-raw-html-extension-).
-    If you need to filter HTML tags, see [Security](#security)
+    If you need to filter HTML tags, see [Security](#security).
 - `extension.DefinitionList`
     - [PHP Markdown Extra: Definition lists](https://michelf.ca/projects/php-markdown/extra/#def-list)
 - `extension.Footnote`
@@ -173,7 +181,7 @@ Parser and Renderer options
     - This extension substitutes punctuations with typographic entities like [smartypants](https://daringfireball.net/projects/smartypants/).
 
 ### Attributes
-`parser.WithAttribute` option allows you to define attributes on some elements.
+The `parser.WithAttribute` option allows you to define attributes on some elements.
 
 Currently only headings support attributes.
 
@@ -197,7 +205,7 @@ heading {#id .className attrName=attrValue}
 
 ### Typographer extension
 
-Typographer extension translates plain ASCII punctuation characters into typographic punctuation HTML entities.
+The Typographer extension translates plain ASCII punctuation characters into typographic-punctuation HTML entities.
 
 Default substitutions are:
 
@@ -211,7 +219,7 @@ Default substitutions are:
 | `<<`       | `&laquo;` |
 | `>>`       | `&raquo;` |
 
-You can overwrite the substitutions by `extensions.WithTypographicSubstitutions`.
+You can override the defualt substitutions via `extensions.WithTypographicSubstitutions`:
 
 ```go
 markdown := goldmark.New(
@@ -226,10 +234,50 @@ markdown := goldmark.New(
 )
 ```
 
+### Linkify extension
+
+The Linkify extension implements [Autolinks(extension)](https://github.github.com/gfm/#autolinks-extension-), as
+defined in [GitHub Flavored Markdown Spec](https://github.github.com/gfm/).
+
+Since the spec does not define details about URLs, there are numerous ambiguous cases.
+
+You can override autolinking patterns via options.
+
+| Functional option | Type | Description |
+| ----------------- | ---- | ----------- |
+| `extension.WithLinkifyAllowedProtocols` | `[][]byte` | List of allowed protocols such as `[][]byte{ []byte("http:") }` |
+| `extension.WithLinkifyURLRegexp` | `*regexp.Regexp` | Regexp that defines URLs, including protocols |
+| `extension.WithLinkifyWWWRegexp` | `*regexp.Regexp` | Regexp that defines URL starting with `www.`. This pattern corresponds to [the extended www autolink](https://github.github.com/gfm/#extended-www-autolink) |
+| `extension.WithLinkifyEmailRegexp` | `*regexp.Regexp` | Regexp that defines email addresses` |
+
+Example, using [xurls](https://github.com/mvdan/xurls):
+
+```go
+import "mvdan.cc/xurls/v2"
+
+markdown := goldmark.New(
+    goldmark.WithRendererOptions(
+        html.WithXHTML(),
+        html.WithUnsafe(),
+    ),
+    goldmark.WithExtensions(
+        extension.NewLinkify(
+            extension.WithLinkifyAllowedProtocols([][]byte{
+                []byte("http:"),
+                []byte("https:"),
+            }),
+            extension.WithLinkifyURLRegexp(
+                xurls.Strict(),
+            ),
+        ),
+    ),
+)
+```
+
 Security
 --------------------
-By default, goldmark does not render raw HTML and potentially dangerous URLs.
-If you need to gain more control over untrusted contents, it is recommended to
+By default, goldmark does not render raw HTML or potentially-dangerous URLs.
+If you need to gain more control over untrusted contents, it is recommended that you
 use an HTML sanitizer such as [bluemonday](https://github.com/microcosm-cc/bluemonday).
 
 Benchmark
@@ -238,11 +286,10 @@ You can run this benchmark in the `_benchmark` directory.
 
 ### against other golang libraries
 
-blackfriday v2 seems to be fastest, but it is not CommonMark compliant, so the performance of
-blackfriday v2 cannot simply be compared with that of the other CommonMark compliant libraries.
+blackfriday v2 seems to be the fastest, but as it is not CommonMark compliant, its performance cannot be directly compared to that of the CommonMark-compliant libraries.
 
-Though goldmark builds clean extensible AST structure and get full compliance with
-CommonMark, it is reasonably fast and has lower memory consumption.
+goldmark, meanwhile, builds a clean, extensible AST structure, achieves full compliance with
+CommonMark, and consumes less memory, all while being reasonably fast.
 
 ```
 goos: darwin
@@ -268,21 +315,21 @@ iteration: 50
 average: 0.0040964230 sec
 ```
 
-As you can see, goldmark performs pretty much equally to cmark.
+As you can see, goldmark's performance is on par with cmark's.
 
 Extensions
 --------------------
 
 - [goldmark-meta](https://github.com/yuin/goldmark-meta): A YAML metadata
   extension for the goldmark Markdown parser.
-- [goldmark-highlighting](https://github.com/yuin/goldmark-highlighting): A Syntax highlighting extension
+- [goldmark-highlighting](https://github.com/yuin/goldmark-highlighting): A syntax-highlighting extension
   for the goldmark markdown parser.
-- [goldmark-mathjax](https://github.com/litao91/goldmark-mathjax): Mathjax support for goldmark markdown parser
+- [goldmark-mathjax](https://github.com/litao91/goldmark-mathjax): Mathjax support for the goldmark markdown parser
 
 goldmark internal(for extension developers)
 ----------------------------------------------
 ### Overview
-goldmark's Markdown processing is outlined as a bellow diagram.
+goldmark's Markdown processing is outlined in the diagram below.
 
 ```
             <Markdown in []byte, parser.Context>
@@ -313,10 +360,11 @@ goldmark's Markdown processing is outlined as a bellow diagram.
 ### Parsing
 Markdown documents are read through `text.Reader` interface.
 
-AST nodes do not have concrete text. AST nodes have segment information of the documents. It is represented by `text.Segment` .
+AST nodes do not have concrete text. AST nodes have segment information of the documents, represented by `text.Segment` .
 
 `text.Segment` has 3 attributes: `Start`, `End`, `Padding` .
 
+(TBC)
 
 **TODO**
 

vendor/github.com/yuin/goldmark/ast/ast.go

@@ -236,10 +236,12 @@ func (n *BaseNode) RemoveChild(self, v Node) {
 
 // RemoveChildren implements Node.RemoveChildren .
 func (n *BaseNode) RemoveChildren(self Node) {
-	for c := n.firstChild; c != nil; c = c.NextSibling() {
+	for c := n.firstChild; c != nil; {
 		c.SetParent(nil)
 		c.SetPreviousSibling(nil)
+		next := c.NextSibling()
 		c.SetNextSibling(nil)
+		c = next
 	}
 	n.firstChild = nil
 	n.lastChild = nil
@@ -466,20 +468,25 @@ type Walker func(n Node, entering bool) (WalkStatus, error)
 
 // Walk walks a AST tree by the depth first search algorithm.
 func Walk(n Node, walker Walker) error {
+	_, err := walkHelper(n, walker)
+	return err
+}
+
+func walkHelper(n Node, walker Walker) (WalkStatus, error) {
 	status, err := walker(n, true)
 	if err != nil || status == WalkStop {
-		return err
+		return status, err
 	}
 	if status != WalkSkipChildren {
 		for c := n.FirstChild(); c != nil; c = c.NextSibling() {
-			if err = Walk(c, walker); err != nil {
-				return err
+			if st, err := walkHelper(c, walker); err != nil || st == WalkStop {
+				return WalkStop, err
 			}
 		}
 	}
 	status, err = walker(n, false)
 	if err != nil || status == WalkStop {
-		return err
+		return WalkStop, err
 	}
-	return nil
+	return WalkContinue, nil
 }

vendor/github.com/yuin/goldmark/ast/block.go

@@ -303,11 +303,11 @@ func NewBlockquote() *Blockquote {
 	}
 }
 
-// A List structr represents a list of Markdown text.
+// A List struct represents a list of Markdown text.
 type List struct {
 	BaseBlock
 
-	// Marker is a markar character like '-', '+', ')' and '.'.
+	// Marker is a marker character like '-', '+', ')' and '.'.
 	Marker byte
 
 	// IsTight is a true if this list is a 'tight' list.
@@ -364,7 +364,7 @@ func NewList(marker byte) *List {
 type ListItem struct {
 	BaseBlock
 
-	// Offset is an offset potision of this item.
+	// Offset is an offset position of this item.
 	Offset int
 }
 

vendor/github.com/yuin/goldmark/ast/inline.go

@@ -170,7 +170,7 @@ func NewText() *Text {
 	}
 }
 
-// NewTextSegment returns a new Text node with the given source potision.
+// NewTextSegment returns a new Text node with the given source position.
 func NewTextSegment(v textm.Segment) *Text {
 	return &Text{
 		BaseInline: BaseInline{},
@@ -467,7 +467,7 @@ type AutoLink struct {
 // Inline implements Inline.Inline.
 func (n *AutoLink) Inline() {}
 
-// Dump implenets Node.Dump
+// Dump implements Node.Dump
 func (n *AutoLink) Dump(source []byte, level int) {
 	segment := n.value.Segment
 	m := map[string]string{

vendor/github.com/yuin/goldmark/extension/ast/tasklist.go

@@ -11,7 +11,7 @@ type TaskCheckBox struct {
 	IsChecked bool
 }
 
-// Dump impelemtns Node.Dump.
+// Dump implements Node.Dump.
 func (n *TaskCheckBox) Dump(source []byte, level int) {
 	m := map[string]string{
 		"Checked": fmt.Sprintf("%v", n.IsChecked),

vendor/github.com/yuin/goldmark/extension/linkify.go

@@ -2,27 +2,153 @@ package extension
 
 import (
 	"bytes"
+	"regexp"
+
 	"github.com/yuin/goldmark"
 	"github.com/yuin/goldmark/ast"
 	"github.com/yuin/goldmark/parser"
 	"github.com/yuin/goldmark/text"
 	"github.com/yuin/goldmark/util"
-	"regexp"
 )
 
-var wwwURLRegxp = regexp.MustCompile(`^www\.[-a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,6}((?:/|[#?])[-a-zA-Z0-9@:%_\+.~#!?&//=\(\);,'">\^{}\[\]` + "`" + `]*)?`)
+var wwwURLRegxp = regexp.MustCompile(`^www\.[-a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]+(?:(?:/|[#?])[-a-zA-Z0-9@:%_\+.~#!?&//=\(\);,'">\^{}\[\]` + "`" + `]*)?`)
 
-var urlRegexp = regexp.MustCompile(`^(?:http|https|ftp):\/\/(?:www\.)?[-a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,6}((?:/|[#?])[-a-zA-Z0-9@:%_+.~#$!?&//=\(\);,'">\^{}\[\]` + "`" + `]*)?`)
+var urlRegexp = regexp.MustCompile(`^(?:http|https|ftp):\/\/(?:www\.)?[-a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]+(?:(?:/|[#?])[-a-zA-Z0-9@:%_+.~#$!?&//=\(\);,'">\^{}\[\]` + "`" + `]*)?`)
 
-type linkifyParser struct {
+// An LinkifyConfig struct is a data structure that holds configuration of the
+// Linkify extension.
+type LinkifyConfig struct {
+	AllowedProtocols [][]byte
+	URLRegexp        *regexp.Regexp
+	WWWRegexp        *regexp.Regexp
+	EmailRegexp      *regexp.Regexp
+}
+
+const optLinkifyAllowedProtocols parser.OptionName = "LinkifyAllowedProtocols"
+const optLinkifyURLRegexp parser.OptionName = "LinkifyURLRegexp"
+const optLinkifyWWWRegexp parser.OptionName = "LinkifyWWWRegexp"
+const optLinkifyEmailRegexp parser.OptionName = "LinkifyEmailRegexp"
+
+// SetOption implements SetOptioner.
+func (c *LinkifyConfig) SetOption(name parser.OptionName, value interface{}) {
+	switch name {
+	case optLinkifyAllowedProtocols:
+		c.AllowedProtocols = value.([][]byte)
+	case optLinkifyURLRegexp:
+		c.URLRegexp = value.(*regexp.Regexp)
+	case optLinkifyWWWRegexp:
+		c.WWWRegexp = value.(*regexp.Regexp)
+	case optLinkifyEmailRegexp:
+		c.EmailRegexp = value.(*regexp.Regexp)
+	}
+}
+
+// A LinkifyOption interface sets options for the LinkifyOption.
+type LinkifyOption interface {
+	parser.Option
+	SetLinkifyOption(*LinkifyConfig)
+}
+
+type withLinkifyAllowedProtocols struct {
+	value [][]byte
+}
+
+func (o *withLinkifyAllowedProtocols) SetParserOption(c *parser.Config) {
+	c.Options[optLinkifyAllowedProtocols] = o.value
+}
+
+func (o *withLinkifyAllowedProtocols) SetLinkifyOption(p *LinkifyConfig) {
+	p.AllowedProtocols = o.value
+}
+
+// WithLinkifyAllowedProtocols is a functional option that specify allowed
+// protocols in autolinks. Each protocol must end with ':' like
+// 'http:' .
+func WithLinkifyAllowedProtocols(value [][]byte) LinkifyOption {
+	return &withLinkifyAllowedProtocols{
+		value: value,
+	}
+}
+
+type withLinkifyURLRegexp struct {
+	value *regexp.Regexp
+}
+
+func (o *withLinkifyURLRegexp) SetParserOption(c *parser.Config) {
+	c.Options[optLinkifyURLRegexp] = o.value
+}
+
+func (o *withLinkifyURLRegexp) SetLinkifyOption(p *LinkifyConfig) {
+	p.URLRegexp = o.value
+}
+
+// WithLinkifyURLRegexp is a functional option that specify
+// a pattern of the URL including a protocol.
+func WithLinkifyURLRegexp(value *regexp.Regexp) LinkifyOption {
+	return &withLinkifyURLRegexp{
+		value: value,
+	}
+}
+
+// WithLinkifyWWWRegexp is a functional option that specify
+// a pattern of the URL without a protocol.
+// This pattern must start with 'www.' .
+type withLinkifyWWWRegexp struct {
+	value *regexp.Regexp
 }
 
-var defaultLinkifyParser = &linkifyParser{}
+func (o *withLinkifyWWWRegexp) SetParserOption(c *parser.Config) {
+	c.Options[optLinkifyWWWRegexp] = o.value
+}
+
+func (o *withLinkifyWWWRegexp) SetLinkifyOption(p *LinkifyConfig) {
+	p.WWWRegexp = o.value
+}
+
+func WithLinkifyWWWRegexp(value *regexp.Regexp) LinkifyOption {
+	return &withLinkifyWWWRegexp{
+		value: value,
+	}
+}
+
+// WithLinkifyWWWRegexp is a functional otpion that specify
+// a pattern of the email address.
+type withLinkifyEmailRegexp struct {
+	value *regexp.Regexp
+}
+
+func (o *withLinkifyEmailRegexp) SetParserOption(c *parser.Config) {
+	c.Options[optLinkifyEmailRegexp] = o.value
+}
+
+func (o *withLinkifyEmailRegexp) SetLinkifyOption(p *LinkifyConfig) {
+	p.EmailRegexp = o.value
+}
+
+func WithLinkifyEmailRegexp(value *regexp.Regexp) LinkifyOption {
+	return &withLinkifyEmailRegexp{
+		value: value,
+	}
+}
+
+type linkifyParser struct {
+	LinkifyConfig
+}
 
 // NewLinkifyParser return a new InlineParser can parse
 // text that seems like a URL.
-func NewLinkifyParser() parser.InlineParser {
-	return defaultLinkifyParser
+func NewLinkifyParser(opts ...LinkifyOption) parser.InlineParser {
+	p := &linkifyParser{
+		LinkifyConfig: LinkifyConfig{
+			AllowedProtocols: nil,
+			URLRegexp:        urlRegexp,
+			WWWRegexp:        wwwURLRegxp,
+		},
+	}
+	for _, o := range opts {
+		o.SetLinkifyOption(&p.LinkifyConfig)
+	}
+	return p
 }
 
 func (s *linkifyParser) Trigger() []byte {
@@ -53,14 +179,26 @@ func (s *linkifyParser) Parse(parent ast.Node, block text.Reader, pc parser.Cont
 	var m []int
 	var protocol []byte
 	var typ ast.AutoLinkType = ast.AutoLinkURL
+	if s.LinkifyConfig.AllowedProtocols == nil {
 		if bytes.HasPrefix(line, protoHTTP) || bytes.HasPrefix(line, protoHTTPS) || bytes.HasPrefix(line, protoFTP) {
-		m = urlRegexp.FindSubmatchIndex(line)
+			m = s.LinkifyConfig.URLRegexp.FindSubmatchIndex(line)
+		}
+	} else {
+		for _, prefix := range s.LinkifyConfig.AllowedProtocols {
+			if bytes.HasPrefix(line, prefix) {
+				m = s.LinkifyConfig.URLRegexp.FindSubmatchIndex(line)
+				break
+			}
+		}
 	}
 	if m == nil && bytes.HasPrefix(line, domainWWW) {
-		m = wwwURLRegxp.FindSubmatchIndex(line)
+		m = s.LinkifyConfig.WWWRegexp.FindSubmatchIndex(line)
 		protocol = []byte("http")
 	}
-	if m != nil {
+	if m != nil && m[0] != 0 {
+		m = nil
+	}
+	if m != nil && m[0] == 0 {
 		lastChar := line[m[1]-1]
 		if lastChar == '.' {
 			m[1]--
@@ -96,7 +234,15 @@ func (s *linkifyParser) Parse(parent ast.Node, block text.Reader, pc parser.Cont
 			return nil
 		}
 		typ = ast.AutoLinkEmail
-		stop := util.FindEmailIndex(line)
+		stop := -1
+		if s.LinkifyConfig.EmailRegexp == nil {
+			stop = util.FindEmailIndex(line)
+		} else {
+			m := s.LinkifyConfig.EmailRegexp.FindSubmatchIndex(line)
+			if m != nil && m[0] == 0 {
+				stop = m[1]
+			}
+		}
 		if stop < 0 {
 			return nil
 		}
@@ -136,15 +282,22 @@ func (s *linkifyParser) CloseBlock(parent ast.Node, pc parser.Context) {
 }
 
 type linkify struct {
+	options []LinkifyOption
 }
 
 // Linkify is an extension that allow you to parse text that seems like a URL.
 var Linkify = &linkify{}
 
+func NewLinkify(opts ...LinkifyOption) goldmark.Extender {
+	return &linkify{
+		options: opts,
+	}
+}
+
 func (e *linkify) Extend(m goldmark.Markdown) {
 	m.Parser().AddOptions(
 		parser.WithInlineParsers(
-			util.Prioritized(NewLinkifyParser(), 999),
+			util.Prioritized(NewLinkifyParser(e.options...), 999),
 		),
 	)
 }

vendor/github.com/yuin/goldmark/extension/table.go

@@ -27,7 +27,7 @@ type tableParagraphTransformer struct {
 var defaultTableParagraphTransformer = &tableParagraphTransformer{}
 
 // NewTableParagraphTransformer returns  a new ParagraphTransformer
-// that can transform pargraphs into tables.
+// that can transform paragraphs into tables.
 func NewTableParagraphTransformer() parser.ParagraphTransformer {
 	return defaultTableParagraphTransformer
 }

vendor/github.com/yuin/goldmark/extension/typographer.go

@@ -1,6 +1,8 @@
 package extension
 
 import (
+	"unicode"
+
 	"github.com/yuin/goldmark"
 	gast "github.com/yuin/goldmark/ast"
 	"github.com/yuin/goldmark/parser"
@@ -31,6 +33,8 @@ const (
 	LeftAngleQuote
 	// RightAngleQuote is >>
 	RightAngleQuote
+	// Apostrophe is '
+	Apostrophe
 
 	typographicPunctuationMax
 )
@@ -52,6 +56,7 @@ func newDefaultSubstitutions() [][]byte {
 	replacements[Ellipsis] = []byte("…")
 	replacements[LeftAngleQuote] = []byte("«")
 	replacements[RightAngleQuote] = []byte("»")
+	replacements[Apostrophe] = []byte("’")
 
 	return replacements
 }
@@ -189,6 +194,26 @@ func (s *typographerParser) Parse(parent gast.Node, block text.Reader, pc parser
 			return nil
 		}
 		if c == '\'' {
+			if s.Substitutions[Apostrophe] != nil {
+				// Handle decade abbrevations such as '90s
+				if d.CanOpen && !d.CanClose && len(line) > 3 && util.IsNumeric(line[1]) && util.IsNumeric(line[2]) && line[3] == 's' {
+					after := util.ToRune(line, 4)
+					if len(line) == 3 || unicode.IsSpace(after) || unicode.IsPunct(after) {
+						node := gast.NewString(s.Substitutions[Apostrophe])
+						node.SetCode(true)
+						block.Advance(1)
+						return node
+					}
+				}
+				// Convert normal apostrophes. This is probably more flexible than necessary but
+				// converts any apostrophe in between two alphanumerics.
+				if len(line) > 1 && (unicode.IsDigit(before) || unicode.IsLetter(before)) && (util.IsAlphaNumeric(line[1])) {
+					node := gast.NewString(s.Substitutions[Apostrophe])
+					node.SetCode(true)
+					block.Advance(1)
+					return node
+				}
+			}
 			if s.Substitutions[LeftSingleQuote] != nil && d.CanOpen && !d.CanClose {
 				node := gast.NewString(s.Substitutions[LeftSingleQuote])
 				node.SetCode(true)
@@ -228,10 +253,10 @@ type typographer struct {
 	options []TypographerOption
 }
 
-// Typographer is an extension that repalace punctuations with typographic entities.
+// Typographer is an extension that replaces punctuations with typographic entities.
 var Typographer = &typographer{}
 
-// NewTypographer returns a new Entender that repalace punctuations with typographic entities.
+// NewTypographer returns a new Extender that replaces punctuations with typographic entities.
 func NewTypographer(opts ...TypographerOption) goldmark.Extender {
 	return &typographer{
 		options: opts,

vendor/github.com/yuin/goldmark/parser/delimiter.go

@@ -11,7 +11,7 @@ import (
 )
 
 // A DelimiterProcessor interface provides a set of functions about
-// Deliiter nodes.
+// Delimiter nodes.
 type DelimiterProcessor interface {
 	// IsDelimiter returns true if given character is a delimiter, otherwise false.
 	IsDelimiter(byte) bool
@@ -38,7 +38,7 @@ type Delimiter struct {
 	// See https://spec.commonmark.org/0.29/#can-open-emphasis for details.
 	CanClose bool
 
-	// Length is a remaining length of this delmiter.
+	// Length is a remaining length of this delimiter.
 	Length int
 
 	// OriginalLength is a original length of this delimiter.

vendor/github.com/yuin/goldmark/parser/link.go

@@ -147,11 +147,6 @@ func (s *linkParser) Parse(parent ast.Node, block text.Reader, pc Context) ast.N
 		ast.MergeOrReplaceTextSegment(last.Parent(), last, last.Segment)
 		return nil
 	}
-	labelValue := block.Value(text.NewSegment(last.Segment.Start+1, segment.Start))
-	if util.IsBlank(labelValue) && !last.IsImage {
-		ast.MergeOrReplaceTextSegment(last.Parent(), last, last.Segment)
-		return nil
-	}
 
 	c := block.Peek()
 	l, pos := block.Position()
@@ -351,14 +346,31 @@ func parseLinkTitle(block text.Reader) ([]byte, bool) {
 	if opener == '(' {
 		closer = ')'
 	}
+	savedLine, savedPosition := block.Position()
+	var title []byte
+	for i := 0; ; i++ {
 		line, _ := block.PeekLine()
-	pos := util.FindClosure(line[1:], opener, closer, false, true)
-	if pos < 0 {
+		if line == nil {
+			block.SetPosition(savedLine, savedPosition)
 			return nil, false
 		}
-	pos += 2 // opener + closer
+		offset := 0
+		if i == 0 {
+			offset = 1
+		}
+		pos := util.FindClosure(line[offset:], opener, closer, false, true)
+		if pos < 0 {
+			title = append(title, line[offset:]...)
+			block.AdvanceLine()
+			continue
+		}
+		pos += offset + 1 // 1: closer
 		block.Advance(pos)
-	return line[1 : pos-1], true
+		if i == 0 { // avoid allocating new slice
+			return line[offset : pos-1], true
+		}
+		return append(title, line[offset:pos-1]...), true
+	}
 }
 
 func (s *linkParser) CloseBlock(parent ast.Node, block text.Reader, pc Context) {

vendor/github.com/yuin/goldmark/parser/parser.go

@@ -459,7 +459,7 @@ type Parser interface {
 	// Parse parses the given Markdown text into AST nodes.
 	Parse(reader text.Reader, opts ...ParseOption) ast.Node
 
-	// AddOption adds the given option to thie parser.
+	// AddOption adds the given option to this parser.
 	AddOptions(...Option)
 }
 
@@ -505,7 +505,7 @@ type BlockParser interface {
 	// Close will be called when the parser returns Close.
 	Close(node ast.Node, reader text.Reader, pc Context)
 
-	// CanInterruptParagraph returns true if the parser can interrupt pargraphs,
+	// CanInterruptParagraph returns true if the parser can interrupt paragraphs,
 	// otherwise false.
 	CanInterruptParagraph() bool
 

vendor/github.com/yuin/goldmark/renderer/html/html.go

@@ -660,13 +660,13 @@ func RenderAttributes(w util.BufWriter, node ast.Node, filter util.BytesFilter)
 	}
 }
 
-// A Writer interface wirtes textual contents to a writer.
+// A Writer interface writes textual contents to a writer.
 type Writer interface {
 	// Write writes the given source to writer with resolving references and unescaping
 	// backslash escaped characters.
 	Write(writer util.BufWriter, source []byte)
 
-	// RawWrite wirtes the given source to writer without resolving references and
+	// RawWrite writes the given source to writer without resolving references and
 	// unescaping backslash escaped characters.
 	RawWrite(writer util.BufWriter, source []byte)
 }

vendor/github.com/yuin/goldmark/text/segment.go

@@ -7,7 +7,7 @@ import (
 
 var space = []byte(" ")
 
-// A Segment struct holds information about source potisions.
+// A Segment struct holds information about source positions.
 type Segment struct {
 	// Start is a start position of the segment.
 	Start int
@@ -197,7 +197,7 @@ func (s *Segments) Sliced(lo, hi int) []Segment {
 	return s.values[lo:hi]
 }
 
-// Clear delete all element of the collction.
+// Clear delete all element of the collection.
 func (s *Segments) Clear() {
 	s.values = nil
 }

vendor/github.com/yuin/goldmark/util/util.go

@@ -8,7 +8,6 @@ import (
 	"regexp"
 	"sort"
 	"strconv"
-	"strings"
 	"unicode/utf8"
 )
 
@@ -55,7 +54,7 @@ func (b *CopyOnWriteBuffer) IsCopied() bool {
 	return b.copied
 }
 
-// IsEscapedPunctuation returns true if caracter at a given index i
+// IsEscapedPunctuation returns true if character at a given index i
 // is an escaped punctuation, otherwise false.
 func IsEscapedPunctuation(source []byte, i int) bool {
 	return source[i] == '\\' && i < len(source)-1 && IsPunct(source[i+1])
@@ -229,7 +228,7 @@ func IndentWidth(bs []byte, currentPos int) (width, pos int) {
 	return
 }
 
-// FirstNonSpacePosition returns a potisoin line that is a first nonspace
+// FirstNonSpacePosition returns a position line that is a first nonspace
 // character.
 func FirstNonSpacePosition(bs []byte) int {
 	i := 0
@@ -387,6 +386,52 @@ func TrimRightSpace(source []byte) []byte {
 	return TrimRight(source, spaces)
 }
 
+// DoFullUnicodeCaseFolding performs full unicode case folding to given bytes.
+func DoFullUnicodeCaseFolding(v []byte) []byte {
+	var rbuf []byte
+	cob := NewCopyOnWriteBuffer(v)
+	n := 0
+	for i := 0; i < len(v); i++ {
+		c := v[i]
+		if c < 0xb5 {
+			if c >= 0x41 && c <= 0x5a {
+				// A-Z to a-z
+				cob.Write(v[n:i])
+				cob.WriteByte(c + 32)
+				n = i + 1
+			}
+			continue
+		}
+
+		if !utf8.RuneStart(c) {
+			continue
+		}
+		r, length := utf8.DecodeRune(v[i:])
+		if r == utf8.RuneError {
+			continue
+		}
+		folded, ok := unicodeCaseFoldings[r]
+		if !ok {
+			continue
+		}
+
+		cob.Write(v[n:i])
+		if rbuf == nil {
+			rbuf = make([]byte, 4)
+		}
+		for _, f := range folded {
+			l := utf8.EncodeRune(rbuf, f)
+			cob.Write(rbuf[:l])
+		}
+		i += length - 1
+		n = i + 1
+	}
+	if cob.IsCopied() {
+		cob.Write(v[n:])
+	}
+	return cob.Bytes()
+}
+
 // ReplaceSpaces replaces sequence of spaces with the given repl.
 func ReplaceSpaces(source []byte, repl byte) []byte {
 	var ret []byte
@@ -439,13 +484,14 @@ func ToValidRune(v rune) rune {
 	return v
 }
 
-// ToLinkReference convert given bytes into a valid link reference string.
-// ToLinkReference trims leading and trailing spaces and convert into lower
+// ToLinkReference converts given bytes into a valid link reference string.
+// ToLinkReference performs unicode case folding, trims leading and trailing spaces,  converts into lower
 // case and replace spaces with a single space character.
 func ToLinkReference(v []byte) string {
 	v = TrimLeftSpace(v)
 	v = TrimRightSpace(v)
-	return strings.ToLower(string(ReplaceSpaces(v, ' ')))
+	v = DoFullUnicodeCaseFolding(v)
+	return string(ReplaceSpaces(v, ' '))
 }
 
 var htmlEscapeTable = [256][]byte{nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, []byte("&quot;"), nil, nil, nil, []byte("&amp;"), nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, []byte("&lt;"), nil, []byte("&gt;"), nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil}
@@ -589,7 +635,7 @@ var htmlSpace = []byte("%20")
 //   2. resolve numeric references
 //   3. resolve entity references
 //
-// URL encoded values (%xx) are keeped as is.
+// URL encoded values (%xx) are kept as is.
 func URLEscape(v []byte, resolveReference bool) []byte {
 	if resolveReference {
 		v = UnescapePunctuations(v)

vendor/modules.txt

@@ -450,7 +450,7 @@ github.com/willf/bitset
 github.com/xanzy/ssh-agent
 # github.com/yohcop/openid-go v0.0.0-20160914080427-2c050d2dae53
 github.com/yohcop/openid-go
-# github.com/yuin/goldmark v1.1.19
+# github.com/yuin/goldmark v1.1.23
 github.com/yuin/goldmark
 github.com/yuin/goldmark/ast
 github.com/yuin/goldmark/extension