Add GDScript(Godot script) language support

AUTHORS.en.txt

@@ -216,3 +216,4 @@ Contributors:
 - Taisuke Fujimoto <temp-impl@users.noreply.github.com>
 - Boone Severson <boone.severson@gmail.com>
 - Victor Zhou <OiCMudkips@users.noreply.github.com>
+- Geequlim <geequlim@gmail.com>

CHANGES.md

@@ -1,7 +1,7 @@
 ## Version 9.4.0 (unreleased)
 
 New languages:
-
+- *GDScript* by [Geequlim][]
 - *PureBASIC* by [Tristano Ajmone][]
 - *BNF* by [Oleg Efimov][]
 
@@ -17,6 +17,7 @@ Improvements:
 - [Boone Severson][] updated Verilog to comply with IEEE 1800-2012 SystemVerilog
 - [Victor Zhou][] improved rules for comments and strings in PowerShell files
 
+[Geequlim]: https://github.com/Geequlim
 [Tristano Ajmone]: https://github.com/tajmone
 [Taisuke Fujimoto]: https://github.com/temp-impl
 [Oleg Efimov]: https://github.com/Sannis

docs/css-classes-reference.rst

@@ -218,6 +218,8 @@ Language names and aliases
 +-------------------------+---------------------------------------------------+
 | GAUSS                   | gauss, gss                                        |
 +-------------------------+---------------------------------------------------+
+| GDScript                | gd, godot, gdscript                               |
++-------------------------+---------------------------------------------------+
 | Gherkin                 | gherkin                                           |
 +-------------------------+---------------------------------------------------+
 | Go                      | go, golang                                        |

test/detect/gdscript/default.txt

@@ -0,0 +1,71 @@
+# a file is a class!
+# inheritance
+
+tool
+extends BaseClass
+
+# member variables
+var a = 5
+var s = "Hello"
+# built-in types
+var v2 = Vector2(1, 2)
+var v3 = Vector3(1, 2, 3)
+var rect = Rect2(0, 0, 20, 20)
+var node = Sprite.new()
+
+# constants
+const a = 5
+const f = sin(20)  # sin() is a built-in function
+
+# static function
+static func sum2(a, b):
+    return a + b
+
+# Cache the enemy class
+const enemy_class = preload("enemy.gd")
+
+# export variables
+export var text
+export(int, FLAGS) var spell_elements = ELEMENT_WIND | ELEMENT_WATER
+export(String, FILE, GLOBAL, "*.png") var tool_image
+
+# setters/getters
+var variable = value setget setterfunc, getterfunc
+
+# signals
+signal your_signal_name
+signal your_signal_name_with_args(a,b)
+
+# function
+func some_function(param1, param2):
+    var local_var = 5
+
+    if param1 < local_var:
+        print(param1)
+    elif param2 > 5:
+        print(param2)
+    else:
+        print("fail!")
+
+    for i in range(20):
+        print(i)
+
+    while(param2 != 0):
+        param2 -= 1
+
+    var local_var2 = param1+3
+    return local_var2
+
+
+# An inner class in this class file
+class SomeInnerClass:
+    var a = 5
+    func print_value_of_a():
+        print(a)
+
+# This is the constructor of the class file's main class
+func _init():
+    var c = SomeInnerClass.new()
+    c.print_value_of_a()
+    # instance a resource
+    var enermy = enemy_class.instance()