Fix Yellow NPC trades

src/core/Data.lua

@@ -38,6 +38,22 @@ local CONSTANT_DEFAULTS = {
   },
 }
 
+-- data/events/trades.asm in Pokemon Yellow has its own TradeMons table.
+-- Old Yellow imports were built from the Red manifest, so correct that
+-- table after loading as well as in the fixed import manifest below.
+local YELLOW_TRADES = {
+  { give = "LICKITUNG", get = "DUGTRIO", dialogset = 1, nickname = "GURIO" },
+  { give = "CLEFAIRY", get = "MR_MIME", dialogset = 1, nickname = "MILES" },
+  { give = "BUTTERFREE", get = "BEEDRILL", dialogset = 3, nickname = "STINGER" },
+  { give = "KANGASKHAN", get = "MUK", dialogset = 1, nickname = "STICKY" },
+  { give = "MEW", get = "MEW", dialogset = 3, nickname = "BART" },
+  { give = "TANGELA", get = "PARASECT", dialogset = 1, nickname = "SPIKE" },
+  { give = "PIDGEOT", get = "PIDGEOT", dialogset = 2, nickname = "MARTY" },
+  { give = "GOLDUCK", get = "RHYDON", dialogset = 2, nickname = "BUFFY" },
+  { give = "GROWLITHE", get = "DEWGONG", dialogset = 3, nickname = "CEZANNE" },
+  { give = "CUBONE", get = "MACHOKE", dialogset = 3, nickname = "RICKY" },
+}
+
 -- field.boot is the total-conversion override point for the new game; the
 -- values match what SaveData.newGame and the Oak speech used to inline.
 local BOOT_DEFAULTS = {
@@ -58,6 +74,12 @@ local function copy(value)
   return out
 end
 
+function Data:applyVersionedFieldData()
+  if require("src.core.GameVersion").isYellow() then
+    self.field.trades = copy(YELLOW_TRADES)
+  end
+end
+
 -- Fills only what the cache is missing, so an importer that learns to
 -- stamp one of these keys silently takes over from the engine.
 function Data:seedDefaults()
@@ -77,6 +99,7 @@ function Data:seedDefaults()
   if constants.dexDigits == nil then
     constants.dexDigits = math.max(3, #tostring(constants.dexSize))
   end
+  self:applyVersionedFieldData()
   local boot = self.field.boot
   if boot == nil then
     boot = {}

tests/parity_yellow_trades.lua

@@ -0,0 +1,59 @@
+-- Pokemon Yellow has a different TradeMons table from Red and Blue.
+-- The import manifest must agree, and Data:seedDefaults repairs Yellow
+-- caches made before that manifest carried the Yellow table (#453).
+
+package.path = "./?.lua;./?/init.lua;" .. package.path
+if not _G.love then _G.love = require("tests.love_stub") end
+
+local Data = require("src.core.Data")
+if not (Data.field and Data.field.trades) then Data:load() end
+local GameVersion = require("src.core.GameVersion")
+local S = require("tests.harness").suite("parity Yellow trades")
+local check, eq = S.check, S.eq
+
+local oldVersion = GameVersion.get()
+local oldTrades = {}
+for i, trade in ipairs(Data.field.trades) do
+  oldTrades[i] = {}
+  for key, value in pairs(trade) do oldTrades[i][key] = value end
+end
+
+GameVersion.set("yellow")
+Data:applyVersionedFieldData()
+
+local expected = {
+  { "LICKITUNG", "DUGTRIO", "GURIO" },
+  { "CLEFAIRY", "MR_MIME", "MILES" },
+  { "BUTTERFREE", "BEEDRILL", "STINGER" },
+  { "KANGASKHAN", "MUK", "STICKY" },
+  { "MEW", "MEW", "BART" },
+  { "TANGELA", "PARASECT", "SPIKE" },
+  { "PIDGEOT", "PIDGEOT", "MARTY" },
+  { "GOLDUCK", "RHYDON", "BUFFY" },
+  { "GROWLITHE", "DEWGONG", "CEZANNE" },
+  { "CUBONE", "MACHOKE", "RICKY" },
+}
+
+local manifestFile = assert(io.open("tools/rom_manifest_yellow.json", "r"))
+local manifest = manifestFile:read("*a")
+manifestFile:close()
+
+eq(#Data.field.trades, #expected, "Yellow has ten in-game trade rows")
+for i, want in ipairs(expected) do
+  local got = Data.field.trades[i]
+  check(got.give == want[1] and got.get == want[2] and got.nickname == want[3],
+    ("Yellow trade %d is %s for %s (%s)"):format(i, want[1], want[2], want[3]))
+  local row = ('"get": "%s",%%s+"give": "%s",%%s+"nickname": "%s"')
+    :format(want[2], want[1], want[3])
+  check(manifest:find(row) ~= nil,
+    ("Yellow manifest carries trade %d"):format(i))
+end
+
+local ricky = Data.field.trades[10]
+check(ricky.give == "CUBONE" and ricky.get == "MACHOKE",
+  "the Underground Path trade is Cubone for Machoke")
+
+Data.field.trades = oldTrades
+GameVersion.set(oldVersion)
+
+return S:finish()

tests/run_tests.lua

@@ -3277,6 +3277,7 @@ runSuites(orderedGlob("tests/parity_*.lua", {
   "tests/parity_flavor.lua", "tests/parity_trainer_sight.lua",
   "tests/parity_static.lua", "tests/parity_trashcans.lua",
   "tests/parity_hof.lua", "tests/parity_trade_gift.lua",
+  "tests/parity_yellow_trades.lua",
   "tests/parity_intro.lua", "tests/parity_tilt.lua",
   "tests/parity_gbcfx.lua",
 }))

tools/make_yellow_manifest.py

@@ -382,6 +382,7 @@ def derive(red, pokeyellow, symbols_path):
         except SystemExit as exc:
             print(f"warning: parse_credits failed ({exc}); keeping Red credits")
             # TODO: hand-author a Yellow credits banner if pret layout drifts.
+        yellow["field"]["trades"] = field.parse_trades(pokeyellow)
     finally:
         util.ASM_DEFINES = saved
 

tools/rom_manifest_yellow.json

@@ -10552,63 +10552,63 @@
     "trades": [
       {
         "dialogset": 1,
-        "get": "NIDORINA",
-        "give": "NIDORINO",
-        "nickname": "TERRY"
+        "get": "DUGTRIO",
+        "give": "LICKITUNG",
+        "nickname": "GURIO"
       },
       {
         "dialogset": 1,
         "get": "MR_MIME",
-        "give": "ABRA",
-        "nickname": "MARCEL"
+        "give": "CLEFAIRY",
+        "nickname": "MILES"
       },
       {
         "dialogset": 3,
         "get": "BEEDRILL",
         "give": "BUTTERFREE",
-        "nickname": "CHIKUCHIKU"
+        "nickname": "STINGER"
       },
       {
         "dialogset": 1,
-        "get": "SEEL",
-        "give": "PONYTA",
-        "nickname": "SAILOR"
+        "get": "MUK",
+        "give": "KANGASKHAN",
+        "nickname": "STICKY"
       },
       {
         "dialogset": 3,
-        "get": "FARFETCHD",
-        "give": "SPEAROW",
-        "nickname": "DUX"
+        "get": "MEW",
+        "give": "MEW",
+        "nickname": "BART"
       },
       {
         "dialogset": 1,
-        "get": "LICKITUNG",
-        "give": "SLOWBRO",
-        "nickname": "MARC"
+        "get": "PARASECT",
+        "give": "TANGELA",
+        "nickname": "SPIKE"
       },
       {
         "dialogset": 2,
-        "get": "JYNX",
-        "give": "POLIWHIRL",
-        "nickname": "LOLA"
+        "get": "PIDGEOT",
+        "give": "PIDGEOT",
+        "nickname": "MARTY"
       },
       {
         "dialogset": 2,
-        "get": "ELECTRODE",
-        "give": "RAICHU",
-        "nickname": "DORIS"
+        "get": "RHYDON",
+        "give": "GOLDUCK",
+        "nickname": "BUFFY"
       },
       {
         "dialogset": 3,
-        "get": "TANGELA",
-        "give": "VENONAT",
-        "nickname": "CRINKLES"
+        "get": "DEWGONG",
+        "give": "GROWLITHE",
+        "nickname": "CEZANNE"
       },
       {
         "dialogset": 3,
-        "get": "NIDORAN_F",
-        "give": "NIDORAN_M",
-        "nickname": "SPOT"
+        "get": "MACHOKE",
+        "give": "CUBONE",
+        "nickname": "RICKY"
       }
     ],
     "warpCarpets": {