support tera

bot.py

@@ -93,7 +93,7 @@ class BotClient(discord.Client):
             "Run Showdown damage calculations.\n"
             "Example format:\n"
             "`  %calc -2 8 SpA Choice Specs Torkoal Overheat vs. 252 HP / 4+ SpD Assault Vest Abomasnow in Sun through Light Screen`\n"
-            "Supported: attacker/defender boosts, EVs, item, species; attacker ability; weather/terrain; screens."
+            "Supported: attacker/defender boosts, EVs, tera, item, species; attacker ability; weather/terrain; screens."
         )
 
     async def _calculate(self, args: list[str]) -> str:

calc.js

@@ -74,6 +74,19 @@ function buildLexer() {
     pattern: /vs\.?/,
   });
 
+  const teraEnter = createToken({
+    name: "teraEnter",
+    pattern: "Tera",
+    push_mode: "tera_mode",
+  });
+  const Tera = createToken({
+    name: "Tera",
+    pattern: new RegExp(
+      [...gen.types].map((t) => escapeRegExp(t.name)).join("|")
+    ),
+    pop_mode: true,
+  });
+
   const terrainEnter = createToken({
     name: "terrainEnter",
     pattern: "in",
@@ -109,9 +122,11 @@ function buildLexer() {
         Ability,
         Pokemon,
         Move,
+        teraEnter,
         terrainEnter,
         screenEnter,
       ],
+      tera_mode: [whitespace, Tera],
       terrain_mode: [whitespace, Weather, Terrain],
       screen_mode: [whitespace, Move],
     },
@@ -229,8 +244,6 @@ function parseAndCalculate(line) {
           }
         }
         break;
-      case "Stat":
-        throw Error("Impossible state: bare Stat");
       case "Item":
         opts().item = unwrapToken("Item", item);
         break;
@@ -247,6 +260,9 @@ function parseAndCalculate(line) {
       case "Move":
         move = unwrapToken("Move", item);
         break;
+      case "teraEnter":
+        opts().teraType = unwrapToken("Tera", it.next().value);
+        break;
       case "terrainEnter":
         {
           let next = it.next().value;
@@ -302,7 +318,7 @@ function parseAndCalculate(line) {
 function test() {
   const text =
     "-2 8 SpA Choice Specs Torkoal Overheat vs. 252 HP / 4+ SpD Assault Vest Abomasnow in Sun through Light Screen";
-  const res = parseAndCalculate(text);
+  var res = parseAndCalculate(text);
 
   assert(res.attacker.boosts.spa === -2, "should have -2 SpA");
   assert(res.attacker.evs.spa === 8, "should have 8 SpA EVs");
@@ -317,6 +333,9 @@ function test() {
     res.desc().replace(/:.*/, "") === text,
     "non-damage text should be equivalent to input"
   );
+
+  res = parseAndCalculate("Tera Electric Iron Hands Wild Charge vs Basculin");
+  assert(res.attacker.teraType === "Electric", "should parse tera type");
 }
 
 export { parseAndCalculate, test };