Added the Nand2Tetris HDL language (#1710)

This adds support for the [Nand2Tetris](https://www.nand2tetris.org/) HDL language.

Author: stephanmax

components.js

@@ -487,6 +487,10 @@
 			"alias": "n4jsd",
 			"owner": "bsmith-n4"
 		},
+		"nand2tetris-hdl": {
+			"title": "Nand To Tetris HDL",
+			"owner": "stephanmax"
+		},
 		"nasm": {
 			"title": "NASM",
 			"owner": "rbmj"

components.json

@@ -0,0 +1,9 @@
+Prism.languages['nand2tetris-hdl'] = {
+	'comment': /\/\/.*|\/\*[\s\S]*?(?:\*\/|$)/,
+	'keyword': /\b(?:CHIP|IN|OUT|PARTS|BUILTIN|CLOCKED)\b/,
+	'boolean': /\b(?:true|false)\b/,
+	'function': /[A-Za-z][A-Za-z0-9]*(?=\()/,
+	'number': /\b\d+\b/,
+	'operator': /=|\.\./,
+	'punctuation': /[{}[\];(),:]/
+};

components/prism-hdl.min.js

@@ -0,0 +1,23 @@
+<h2>Comments</h2>
+<pre><code>// Single line comment
+/* Multi-line
+comment */</code></pre>
+
+<h2>Literal values</h2>
+<pre><code>0
+32
+true
+false</code></pre>
+
+<h2>Full example</h2>
+<pre><code>/*
+ * Checks if two input bits are equal
+ */
+ 
+CHIP Eq {
+  IN a, b;
+  OUT out; // True iff a=b
+  PARTS:
+    Xor(a=a, b=b, out=uneq);
+    Not(in=uneq, out=out);
+}</code></pre>

components/prism-nand2tetris-hdl.js

@@ -11,7 +11,7 @@ if (!Prism.plugins.toolbar) {
 }
 
 // The languages map is built automatically with gulp
-var Languages = /*languages_placeholder[*/{"html":"HTML","xml":"XML","svg":"SVG","mathml":"MathML","css":"CSS","clike":"C-like","javascript":"JavaScript","abap":"ABAP","actionscript":"ActionScript","apacheconf":"Apache Configuration","apl":"APL","applescript":"AppleScript","arff":"ARFF","asciidoc":"AsciiDoc","asm6502":"6502 Assembly","aspnet":"ASP.NET (C#)","autohotkey":"AutoHotkey","autoit":"AutoIt","shell":"Shell","basic":"BASIC","csharp":"C#","cpp":"C++","cil":"CIL","coffeescript":"CoffeeScript","csp":"Content-Security-Policy","css-extras":"CSS Extras","django":"Django/Jinja2","erb":"ERB","fsharp":"F#","gcode":"G-code","gedcom":"GEDCOM","glsl":"GLSL","gml":"GameMaker Language","graphql":"GraphQL","hcl":"HCL","http":"HTTP","hpkp":"HTTP Public-Key-Pins","hsts":"HTTP Strict-Transport-Security","ichigojam":"IchigoJam","inform7":"Inform 7","javastacktrace":"Java stack trace","json":"JSON","jsonp":"JSONP","latex":"LaTeX","livescript":"LiveScript","lolcode":"LOLCODE","markup-templating":"Markup templating","matlab":"MATLAB","mel":"MEL","n1ql":"N1QL","n4js":"N4JS","nasm":"NASM","nginx":"nginx","nsis":"NSIS","objectivec":"Objective-C","ocaml":"OCaml","opencl":"OpenCL","parigp":"PARI/GP","objectpascal":"Object Pascal","php":"PHP","php-extras":"PHP Extras","plsql":"PL/SQL","powershell":"PowerShell","properties":".properties","protobuf":"Protocol Buffers","q":"Q (kdb+ database)","jsx":"React JSX","tsx":"React TSX","renpy":"Ren'py","rest":"reST (reStructuredText)","sas":"SAS","sass":"Sass (Sass)","scss":"Sass (Scss)","sql":"SQL","soy":"Soy (Closure Template)","tap":"TAP","toml":"TOML","tt2":"Template Toolkit 2","typescript":"TypeScript","vbnet":"VB.Net","vhdl":"VHDL","vim":"vim","visual-basic":"Visual Basic","wasm":"WebAssembly","wiki":"Wiki markup","xeoracube":"XeoraCube","xojo":"Xojo (REALbasic)","xquery":"XQuery","yaml":"YAML"}/*]*/;
+var Languages = /*languages_placeholder[*/{"html":"HTML","xml":"XML","svg":"SVG","mathml":"MathML","css":"CSS","clike":"C-like","javascript":"JavaScript","abap":"ABAP","actionscript":"ActionScript","apacheconf":"Apache Configuration","apl":"APL","applescript":"AppleScript","arff":"ARFF","asciidoc":"AsciiDoc","asm6502":"6502 Assembly","aspnet":"ASP.NET (C#)","autohotkey":"AutoHotkey","autoit":"AutoIt","shell":"Shell","basic":"BASIC","csharp":"C#","cpp":"C++","cil":"CIL","coffeescript":"CoffeeScript","csp":"Content-Security-Policy","css-extras":"CSS Extras","django":"Django/Jinja2","erb":"ERB","fsharp":"F#","gcode":"G-code","gedcom":"GEDCOM","glsl":"GLSL","gml":"GameMaker Language","graphql":"GraphQL","hcl":"HCL","http":"HTTP","hpkp":"HTTP Public-Key-Pins","hsts":"HTTP Strict-Transport-Security","ichigojam":"IchigoJam","inform7":"Inform 7","javastacktrace":"Java stack trace","json":"JSON","jsonp":"JSONP","latex":"LaTeX","livescript":"LiveScript","lolcode":"LOLCODE","markup-templating":"Markup templating","matlab":"MATLAB","mel":"MEL","n1ql":"N1QL","n4js":"N4JS","nand2tetris-hdl":"Nand To Tetris HDL","nasm":"NASM","nginx":"nginx","nsis":"NSIS","objectivec":"Objective-C","ocaml":"OCaml","opencl":"OpenCL","parigp":"PARI/GP","objectpascal":"Object Pascal","php":"PHP","php-extras":"PHP Extras","plsql":"PL/SQL","powershell":"PowerShell","properties":".properties","protobuf":"Protocol Buffers","q":"Q (kdb+ database)","jsx":"React JSX","tsx":"React TSX","renpy":"Ren'py","rest":"reST (reStructuredText)","sas":"SAS","sass":"Sass (Sass)","scss":"Sass (Scss)","sql":"SQL","soy":"Soy (Closure Template)","tap":"TAP","toml":"TOML","tt2":"Template Toolkit 2","typescript":"TypeScript","vbnet":"VB.Net","vhdl":"VHDL","vim":"vim","visual-basic":"Visual Basic","wasm":"WebAssembly","wiki":"Wiki markup","xeoracube":"XeoraCube","xojo":"Xojo (REALbasic)","xquery":"XQuery","yaml":"YAML"}/*]*/;
 Prism.plugins.toolbar.registerButton('show-language', function(env) {
 	var pre = env.element.parentNode;
 	if (!pre || !/pre/i.test(pre.nodeName)) {

components/prism-nand2tetris-hdl.min.js

@@ -0,0 +1,13 @@
+true
+false
+
+----------------------------------------------------
+
+[
+	["boolean", "true"],
+	["boolean", "false"]
+]
+
+----------------------------------------------------
+
+Checks for booleans.

examples/prism-nand2tetris-hdl.html

@@ -0,0 +1,20 @@
+// foobar
+/**/
+/* foo
+bar */
+/*
+ * foobar
+ */
+
+----------------------------------------------------
+
+[
+	["comment", "// foobar"],
+	["comment", "/**/"],
+	["comment", "/* foo\r\nbar */"],
+	["comment", "/*\r\n * foobar\r\n */"]
+]
+
+----------------------------------------------------
+
+Checks for single-line and multi-line comments.