1 files changed, 107 insertions, 0 deletions
diff --git a/vendor/github.com/mvdan/xurls/xurls.go b/vendor/github.com/mvdan/xurls/xurls.go
new file mode 100644
index 0000000000..d6279ae60b
--- /dev/null
+++ b/vendor/github.com/mvdan/xurls/xurls.go
@@ -0,0 +1,107 @@
+// Copyright (c) 2015, Daniel Martí <mvdan@mvdan.cc>
+// See LICENSE for licensing information
+
+// Package xurls extracts urls from plain text using regular expressions.
+package xurls
+
+import (
+	"bytes"
+	"regexp"
+)
+
+//go:generate go run generate/tldsgen/main.go
+//go:generate go run generate/schemesgen/main.go
+
+const (
+	letter    = `\p{L}`
+	mark      = `\p{M}`
+	number    = `\p{N}`
+	iriChar   = letter + mark + number
+	currency  = `\p{Sc}`
+	otherSymb = `\p{So}`
+	endChar   = iriChar + `/\-+_&~*%=#` + currency + otherSymb
+	otherPunc = `\p{Po}`
+	midChar   = endChar + `|` + otherPunc
+	wellParen = `\([` + midChar + `]*(\([` + midChar + `]*\)[` + midChar + `]*)*\)`
+	wellBrack = `\[[` + midChar + `]*(\[[` + midChar + `]*\][` + midChar + `]*)*\]`
+	wellBrace = `\{[` + midChar + `]*(\{[` + midChar + `]*\}[` + midChar + `]*)*\}`
+	wellAll   = wellParen + `|` + wellBrack + `|` + wellBrace
+	pathCont  = `([` + midChar + `]*(` + wellAll + `|[` + endChar + `])+)+`
+
+	iri      = `[` + iriChar + `]([` + iriChar + `\-]*[` + iriChar + `])?`
+	domain   = `(` + iri + `\.)+`
+	octet    = `(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9][0-9]|[0-9])`
+	ipv4Addr = `\b` + octet + `\.` + octet + `\.` + octet + `\.` + octet + `\b`
+	ipv6Addr = `([0-9a-fA-F]{1,4}:([0-9a-fA-F]{1,4}:([0-9a-fA-F]{1,4}:([0-9a-fA-F]{1,4}:([0-9a-fA-F]{1,4}:[0-9a-fA-F]{0,4}|:[0-9a-fA-F]{1,4})?|(:[0-9a-fA-F]{1,4}){0,2})|(:[0-9a-fA-F]{1,4}){0,3})|(:[0-9a-fA-F]{1,4}){0,4})|:(:[0-9a-fA-F]{1,4}){0,5})((:[0-9a-fA-F]{1,4}){2}|:(25[0-5]|(2[0-4]|1[0-9]|[1-9])?[0-9])(\.(25[0-5]|(2[0-4]|1[0-9]|[1-9])?[0-9])){3})|(([0-9a-fA-F]{1,4}:){1,6}|:):[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){7}:`
+	ipAddr   = `(` + ipv4Addr + `|` + ipv6Addr + `)`
+	port     = `(:[0-9]*)?`
+)
+
+// AnyScheme can be passed to StrictMatchingScheme to match any possibly valid
+// scheme, and not just the known ones.
+var AnyScheme = `([a-zA-Z][a-zA-Z.\-+]*://|` + anyOf(SchemesNoAuthority...) + `:)`
+
+// SchemesNoAuthority is a sorted list of some well-known url schemes that are
+// followed by ":" instead of "://".
+var SchemesNoAuthority = []string{
+	`bitcoin`, // Bitcoin
+	`file`,    // Files
+	`magnet`,  // Torrent magnets
+	`mailto`,  // Mail
+	`sms`,     // SMS
+	`tel`,     // Telephone
+	`xmpp`,    // XMPP
+}
+
+func anyOf(strs ...string) string {
+	var b bytes.Buffer
+	b.WriteByte('(')
+	for i, s := range strs {
+		if i != 0 {
+			b.WriteByte('|')
+		}
+		b.WriteString(regexp.QuoteMeta(s))
+	}
+	b.WriteByte(')')
+	return b.String()
+}
+
+func strictExp() string {
+	schemes := `(` + anyOf(Schemes...) + `://|` + anyOf(SchemesNoAuthority...) + `:)`
+	return `(?i)` + schemes + `(?-i)` + pathCont
+}
+
+func relaxedExp() string {
+	site := domain + `(?i)` + anyOf(append(TLDs, PseudoTLDs...)...) + `(?-i)`
+	hostName := `(` + site + `|` + ipAddr + `)`
+	webURL := hostName + port + `(/|/` + pathCont + `?|\b|$)`
+	return strictExp() + `|` + webURL
+}
+
+// Strict produces a regexp that matches any URL with a scheme in either the
+// Schemes or SchemesNoAuthority lists.
+func Strict() *regexp.Regexp {
+	re := regexp.MustCompile(strictExp())
+	re.Longest()
+	return re
+}
+
+// Relaxed produces a regexp that matches any URL matched by Strict, plus any
+// URL with no scheme.
+func Relaxed() *regexp.Regexp {
+	re := regexp.MustCompile(relaxedExp())
+	re.Longest()
+	return re
+}
+
+// StrictMatchingScheme produces a regexp similar to Strict, but requiring that
+// the scheme match the given regular expression. See AnyScheme too.
+func StrictMatchingScheme(exp string) (*regexp.Regexp, error) {
+	strictMatching := `(?i)(` + exp + `)(?-i)` + pathCont
+	re, err := regexp.Compile(strictMatching)
+	if err != nil {
+		return nil, err
+	}
+	re.Longest()
+	return re, nil
+}