Added support for DNS zone files (#1961)

This adds support for DNS zone files.

The highlighting is quite simple as every type and class is highlighted as `keyword`. This is intentional as other token names (e.g. `class-name`, `function`, `builtin`, ...) are not highlighted by every theme resulting in large portions of unstyled text for some themes.

components.json

@@ -240,6 +240,11 @@
 			"alias": "jinja2",
 			"owner": "romanvm"
 		},
+		"dns-zone-file": {
+			"title": "DNS zone file",
+			"owner": "RunDevelopment",
+			"alias": "dns-zone"
+		},
 		"docker": {
 			"title": "Docker",
 			"alias": "dockerfile",

components/prism-dns-zone-file.js

@@ -0,0 +1,33 @@
+Prism.languages['dns-zone-file'] = {
+	'comment': /;.*/,
+	'string': {
+		pattern: /"(?:\\.|[^"\\\r\n])*"/,
+		greedy: true
+	},
+	'variable': [
+		{
+			pattern: /(^\$ORIGIN[ \t]+)\S+/m,
+			lookbehind: true,
+		},
+		{
+			pattern: /(^|\s)@(?=\s|$)/,
+			lookbehind: true,
+		}
+	],
+	'keyword': /^\$(?:ORIGIN|INCLUDE|TTL)(?=\s|$)/m,
+	'class': {
+		// https://tools.ietf.org/html/rfc1035#page-13
+		pattern: /(^|\s)(?:IN|CH|CS|HS)(?=\s|$)/,
+		lookbehind: true,
+		alias: 'keyword'
+	},
+	'type': {
+		// https://en.wikipedia.org/wiki/List_of_DNS_record_types
+		pattern: /(^|\s)(?:A|A6|AAAA|AFSDB|APL|ATMA|CAA|CDNSKEY|CDS|CERT|CNAME|DHCID|DLV|DNAME|DNSKEY|DS|EID|GID|GPOS|HINFO|HIP|IPSECKEY|ISDN|KEY|KX|LOC|MAILA|MAILB|MB|MD|MF|MG|MINFO|MR|MX|NAPTR|NB|NBSTAT|NIMLOC|NINFO|NS|NSAP|NSAP-PTR|NSEC|NSEC3|NSEC3PARAM|NULL|NXT|OPENPGPKEY|PTR|PX|RKEY|RP|RRSIG|RT|SIG|SINK|SMIMEA|SOA|SPF|SRV|SSHFP|TA|TKEY|TLSA|TSIG|TXT|UID|UINFO|UNSPEC|URI|WKS|X25)(?=\s|$)/,
+		lookbehind: true,
+		alias: 'keyword'
+	},
+	'punctuation': /[()]/
+};
+
+Prism.languages['dns-zone'] = Prism.languages['dns-zone-file']

examples/prism-dns-zone-file.html

@@ -0,0 +1,14 @@
+<h2>Full example</h2>
+<pre><code>$TTL 3d
+@ IN SOA root.localhost. root.sneaky.net. (
+    2015050503 ; serial
+    12h        ; refresh
+    15m        ; retry
+    3w         ; expire
+    3h         ; negative response TTL
+  )
+  IN NS root.localhost.
+  IN NS localhost. ; secondary name server is preferably externally maintained
+
+www IN A 3.141.59.26
+ww1 IN CNAME www</code></pre>

plugins/autoloader/prism-autoloader.js

@@ -133,6 +133,7 @@
 		"dotnet": "csharp",
 		"coffee": "coffeescript",
 		"jinja2": "django",
+		"dns-zone": "dns-zone-file",
 		"dockerfile": "docker",
 		"gamemakerlanguage": "gml",
 		"hs": "haskell",

plugins/show-language/prism-show-language.js

@@ -45,6 +45,8 @@
 		"css-extras": "CSS Extras",
 		"django": "Django/Jinja2",
 		"jinja2": "Django/Jinja2",
+		"dns-zone-file": "DNS zone file",
+		"dns-zone": "DNS zone file",
 		"dockerfile": "Docker",
 		"ebnf": "Extended Backus–Naur form",
 		"ejs": "EJS",

tests/languages/dns-zone-file/class_feature.test

@@ -0,0 +1,17 @@
+IN
+CH
+CS
+HS
+
+----------------------------------------------------
+
+[
+	["class", "IN"],
+	["class", "CH"],
+	["class", "CS"],
+	["class", "HS"]
+]
+
+----------------------------------------------------
+
+Checks for all resource record classes.

tests/languages/dns-zone-file/comment_feature.test

@@ -0,0 +1,11 @@
+; comment
+
+----------------------------------------------------
+
+[
+	["comment", "; comment"]
+]
+
+----------------------------------------------------
+
+Checks for comments.

tests/languages/dns-zone-file/string_feature.test

@@ -0,0 +1,13 @@
+"foo"
+"\""
+
+----------------------------------------------------
+
+[
+	["string", "\"foo\""],
+	["string", "\"\\\"\""]
+]
+
+----------------------------------------------------
+
+Checks for strings.

tests/languages/dns-zone-file/type_featrue.test

@@ -0,0 +1,155 @@
+A
+A6
+AAAA
+AFSDB
+APL
+ATMA
+CAA
+CDNSKEY
+CDS
+CERT
+CNAME
+DHCID
+DLV
+DNAME
+DNSKEY
+DS
+EID
+GID
+GPOS
+HINFO
+HIP
+IPSECKEY
+ISDN
+KEY
+KX
+LOC
+MAILA
+MAILB
+MB
+MD
+MF
+MG
+MINFO
+MR
+MX
+NAPTR
+NB
+NBSTAT
+NIMLOC
+NINFO
+NS
+NSAP
+NSAP-PTR
+NSEC
+NSEC3
+NSEC3PARAM
+NULL
+NXT
+OPENPGPKEY
+PTR
+PX
+RKEY
+RP
+RRSIG
+RT
+SIG
+SINK
+SMIMEA
+SOA
+SPF
+SRV
+SSHFP
+TA
+TKEY
+TLSA
+TSIG
+TXT
+UID
+UINFO
+UNSPEC
+URI
+WKS
+X25
+
+----------------------------------------------------
+
+[
+	["type", "A"],
+	["type", "A6"],
+	["type", "AAAA"],
+	["type", "AFSDB"],
+	["type", "APL"],
+	["type", "ATMA"],
+	["type", "CAA"],
+	["type", "CDNSKEY"],
+	["type", "CDS"],
+	["type", "CERT"],
+	["type", "CNAME"],
+	["type", "DHCID"],
+	["type", "DLV"],
+	["type", "DNAME"],
+	["type", "DNSKEY"],
+	["type", "DS"],
+	["type", "EID"],
+	["type", "GID"],
+	["type", "GPOS"],
+	["type", "HINFO"],
+	["type", "HIP"],
+	["type", "IPSECKEY"],
+	["type", "ISDN"],
+	["type", "KEY"],
+	["type", "KX"],
+	["type", "LOC"],
+	["type", "MAILA"],
+	["type", "MAILB"],
+	["type", "MB"],
+	["type", "MD"],
+	["type", "MF"],
+	["type", "MG"],
+	["type", "MINFO"],
+	["type", "MR"],
+	["type", "MX"],
+	["type", "NAPTR"],
+	["type", "NB"],
+	["type", "NBSTAT"],
+	["type", "NIMLOC"],
+	["type", "NINFO"],
+	["type", "NS"],
+	["type", "NSAP"],
+	["type", "NSAP-PTR"],
+	["type", "NSEC"],
+	["type", "NSEC3"],
+	["type", "NSEC3PARAM"],
+	["type", "NULL"],
+	["type", "NXT"],
+	["type", "OPENPGPKEY"],
+	["type", "PTR"],
+	["type", "PX"],
+	["type", "RKEY"],
+	["type", "RP"],
+	["type", "RRSIG"],
+	["type", "RT"],
+	["type", "SIG"],
+	["type", "SINK"],
+	["type", "SMIMEA"],
+	["type", "SOA"],
+	["type", "SPF"],
+	["type", "SRV"],
+	["type", "SSHFP"],
+	["type", "TA"],
+	["type", "TKEY"],
+	["type", "TLSA"],
+	["type", "TSIG"],
+	["type", "TXT"],
+	["type", "UID"],
+	["type", "UINFO"],
+	["type", "UNSPEC"],
+	["type", "URI"],
+	["type", "WKS"],
+	["type", "X25"]
+]
+
+----------------------------------------------------
+
+Checks for all resource record types.

tests/languages/dns-zone-file/variable_feature.test

@@ -0,0 +1,14 @@
+$ORIGIN foo.bar.com
+@
+
+----------------------------------------------------
+
+[
+	["keyword", "$ORIGIN"],
+	["variable", "foo.bar.com"],
+	["variable", "@"]
+]
+
+----------------------------------------------------
+
+Checks for variables.