Add Redscript support

languages.json

@@ -1204,6 +1204,14 @@
       "multi_line_comments": [["<!--", "-->"], ["@*", "*@"]],
       "extensions": ["cshtml"]
     },
+    "Redscript": {
+      "name": "Redscript",
+      "line_comment": ["//", "///"],
+      "multi_line_comments": [["/*", "*/"]],
+      "quotes": [["\\\"", "\\\""]],
+      "nested": true,
+      "extensions": ["reds"]
+    },
     "Renpy": {
       "name": "Ren'Py",
       "line_comment": ["#"],

tests/data/redscript.reds

@@ -0,0 +1,75 @@
+// 75 lines 47 code 20 comments 8 blanks
+
+// redscript allows line comments
+/* as well as block comments */
+
+// it supports global functions
+func add2(x: Int32, y: Int32) -> Int32 {
+  return x + y;
+}
+
+// functions without a type annotation default to Void return type
+func tutorial() {
+  let x: Int32 = 10;
+  // compiler can infer types for local variables, y will be Int32
+  let y = 20;
+  // it supports arithmetic
+  let sum = x + y + 13;
+  // as well as mutation
+  let mutable = 0;
+  mutable += 10;
+  // numbers with decimal points default to type Float
+  let num = 10.0;
+  // you can cast between some types
+  let uint: Uint8 = Cast(10);
+  // array literals
+  let arr = [1, 2, 3];
+  // array iteration
+  for item in arr {
+    // logging and string operations
+    Log("at " + ToString(item));
+  }
+}
+
+// you can define your own classes
+public class IntTuple {
+  let fst: Int32;
+  let snd: Int32;
+
+  // you can define static member functions
+  public static func Create(fst: Int32, snd: Int32) -> ref<IntTuple> {
+    let tuple = new IntTuple();
+    tuple.fst = fst;
+    tuple.snd = snd;
+    return tuple;
+  }
+
+  public func Swap() {
+    let tmp = this.fst;
+    this.fst = this.snd;
+    this.snd = tmp;
+  }
+}
+
+// you can replace existing in-game methods by specifying the class they belong to
+@replaceMethod(CraftingSystem)
+private final func ProcessCraftSkill(xpAmount: Int32, craftedItem: StatsObjectID) {
+  // instantiate a class using the new operator
+  let xpEvent = new ExperiencePointsEvent();
+  xpEvent.amount = xpAmount * 100;
+  xpEvent.type = gamedataProficiencyType.Crafting;
+  GetPlayer(this.GetGameInstance()).QueueEvent(xpEvent);
+}
+
+// you can add new methods to existing classes as well
+// they are visible to other code using the class
+@addMethod(BackpackMainGameController)
+private final func DisassembleAllJunkItems() -> Void {
+  let items = this.m_InventoryManager.GetPlayerItemsByType(gamedataItemType.Gen_Junk);
+  let i = 0;
+  for item in items {
+    ItemActionsHelper.DisassembleItem(this.m_player, InventoryItemData.GetID(item));
+  };
+  // some methods require CName literals, they need to be prefixed with the n letter
+  this.PlaySound(n"Item", n"OnBuy");
+}