Add G-code language (#1572)

This PR adds the [G-code language](https://reprap.org/wiki/G-code) to Prism
and resolves #1571.

### Features

- All fields from A-Z ([case sensitive](https://reprap.org/wiki/G-code#Case_sensitivity)) and [checksums](https://reprap.org/wiki/G-code#.2A:_Checksum) (`*`).
- [Comments](https://reprap.org/wiki/G-code#Comments) of both the semicolon and parenthesis style.
- [Quoted strings](https://reprap.org/wiki/G-code#Quoted_strings).
- The colon punctuation of [lists (see the example)](https://reprap.org/wiki/G-code#M584:_Set_drive_mapping).

components.json

@@ -266,6 +266,10 @@
 			"title": "Fortran",
 			"owner": "Golmote"
 		},
+		"gcode": {
+			"title": "G-code",
+			"owner": "RunDevelopment"
+		},
 		"gedcom": {
 			"title": "GEDCOM",
 			"owner": "Golmote"

components/prism-gcode.js

@@ -0,0 +1,15 @@
+Prism.languages.gcode = {
+	'comment': /;.*|\B\(.*?\)\B/,
+	'string': {
+		pattern: /"(?:""|[^"])*"/,
+		greedy: true
+	},
+	'keyword': /\b[GM]\d+(?:\.\d+)?\b/,
+	'property': /\b[A-Z]/,
+	'checksum': {
+		pattern: /\*\d+/,
+		alias: 'punctuation'
+	},
+	// T0:0:0
+	'punctuation': /:/
+};

examples/prism-gcode.html

@@ -0,0 +1,22 @@
+<h2>Comments</h2>
+<pre><code>; comment
+(some more comments)
+G28 (even in here) X0
+</code></pre>
+
+<h2>Quoted strings</h2>
+<pre><code>"foo""bar"</code></pre>
+
+<h2>Full example</h2>
+<pre><code>M190 S60 ; Heat bed to 60°C
+G21 ; Set units to millimeters
+G28 ; Move to Origin (Homing)
+G29 ; Auto Bed Leveling
+G28 X0 Y0 ; Home X and Y to min endstops
+M107 ; Fan off
+M109 S200 ; Heat hotend to 200°C
+G92 E0 ; Set current extruder position as zero
+G1 F200 E15 ; Extrude 15mm filament with 200mm/min
+G92 E0 ; Set current extruder position as zero
+G1 F500
+</code></pre>

plugins/show-language/prism-show-language.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#","gedcom":"GEDCOM","glsl":"GLSL","gml":"GameMaker Language","graphql":"GraphQL","http":"HTTP","hpkp":"HTTP Public-Key-Pins","hsts":"HTTP Strict-Transport-Security","ichigojam":"IchigoJam","inform7":"Inform 7","json":"JSON","jsonp":"JSONP","latex":"LaTeX","livescript":"LiveScript","lolcode":"LOLCODE","markup-templating":"Markup templating","matlab":"MATLAB","mel":"MEL","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","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","http":"HTTP","hpkp":"HTTP Public-Key-Pins","hsts":"HTTP Strict-Transport-Security","ichigojam":"IchigoJam","inform7":"Inform 7","json":"JSON","jsonp":"JSONP","latex":"LaTeX","livescript":"LiveScript","lolcode":"LOLCODE","markup-templating":"Markup templating","matlab":"MATLAB","mel":"MEL","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","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)) {

tests/languages/gcode/checksum_feature.test

@@ -0,0 +1,12 @@
+G28*22
+
+----------------------------------------------------
+
+[
+	["keyword", "G28"],
+	["checksum", "*22"]
+]
+
+----------------------------------------------------
+
+Checks for checksums.

tests/languages/gcode/comment_feature.test

@@ -0,0 +1,20 @@
+; foo
+(Home some axes)
+G28 (here come the axes to be homed) X
+
+----------------------------------------------------
+
+[
+	["comment", "; foo"],
+
+	["comment", "(Home some axes)"],
+
+	["keyword", "G28"],
+	["comment", "(here come the axes to be homed)"],
+	["property", "X"]
+
+]
+
+----------------------------------------------------
+
+Checks for comments.

tests/languages/gcode/keyword_feature.test

@@ -0,0 +1,23 @@
+G00
+G200
+G84.1
+
+M00
+M123
+M52.4
+
+----------------------------------------------------
+
+[
+	["keyword", "G00"],
+	["keyword", "G200"],
+	["keyword", "G84.1"],
+
+	["keyword", "M00"],
+	["keyword", "M123"],
+	["keyword", "M52.4"]
+]
+
+----------------------------------------------------
+
+Checks for G- and M-codes.

tests/languages/gcode/property_feature.test

@@ -0,0 +1,17 @@
+X123
+Y0.2
+Z-3.1415
+E420:420
+
+----------------------------------------------------
+
+[
+	["property", "X"], "123\n",
+	["property", "Y"], "0.2\n",
+	["property", "Z"], "-3.1415\n",
+	["property", "E"], "420", ["punctuation", ":"], "420"
+]
+
+----------------------------------------------------
+
+Checks for all other codes except G- and M-codes.

tests/languages/gcode/string_feature.test

@@ -0,0 +1,17 @@
+M587 S"MYROUTER" P"ABCxyz;"" 123"
+
+----------------------------------------------------
+
+[
+	["keyword", "M587"],
+
+	["property", "S"],
+	["string", "\"MYROUTER\""],
+
+	["property", "P"],
+	["string", "\"ABCxyz;\"\" 123\""]
+]
+
+----------------------------------------------------
+
+Checks for strings.