Phase 8: the pack's own JEI pages for every drop source
Adrian, 2026-11-02/03: every item that can drop gets a JEI page naming its sources, alongside the Cobblemon Info add-on (which shows drops and biomes, not zones). The companion mod's JEI plugin (jei/DropSourcesJei.kt) adds: - Pokemon drops on the island: 794 species of lines that live on the island, with chances, amounts and the zones they spawn in (or where their line lives); spawns with their own drops (Beheeyem in the End). The Drop Synthesizer core is the catalyst. - Guardians and the End boss; Sacrifice Altar tiers and specials; Rebirth Chamber; zone ore veins with regrow times; Cobblebase pasture finds per skill and zone. JEI runs on the client, so the pages read assets/cobblesurvival/jei/ drop_sources.json inside the mod, written by tools/jei_sources.py from the pack's files. Self-tests drop_sources_match_the_server (file vs live server: drops, zones, own-drop spawns, guardians, End boss, altar) and jei_pages_build (every page builds, every item exists). The ore a vein gives moved into world/zones.json (ores -> item), shared with the quest book. JEI's API (19.64.0.455) is a compile-only dependency from JEI's own Maven. Self-tests and the island check pass. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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#!/usr/bin/env python3
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"""Write the data behind the pack's own JEI pages (roadmap Phase 8; Adrian, 2026-11-02: every item that can drop gets
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a JEI page naming its sources; 2026-11-03: alongside the Cobblemon Info add-on, which shows spawns and drops but not
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the island's zones).
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JEI runs on the client, which on a dedicated server doesn't have the pack's server data, so the pages are built from
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this file inside the companion mod: mod/src/main/resources/assets/cobblesurvival/jei/drop_sources.json. It holds:
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pokemon every species of a line that lives on the island: its drops (as the Drop Synthesizer rolls them)
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and the zones it spawns in, or the zones where its line lives
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spawn_drops zone spawns that drop something else than their species (e.g. Beheeyem in the End)
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guardians each zone guardian: species, level, drops, return time
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end_boss the End boss and what beating it gives
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altar the Sacrifice Altar's level tiers and type specials; rebirth: the Rebirth Chamber's extra
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ore_veins per zone, what its regenerating veins give and how fast they regrow
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pasture_finds per Cobblebase skill and zone, what a pasture's Pokémon can find (the pack's zone-bound tables)
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The self-test drop_sources_match_the_server compares it with the live server, so run this after changing species
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drops, spawns, guardians, the End boss, the altar, ore veins or Cobblebase's tables, then rebuild the mod.
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Needs the Cobblemon jar in build/server/mods (any test-server run).
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Usage: tools/jei_sources.py
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"""
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import json
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import re
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import zipfile
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from collections import defaultdict
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from pathlib import Path
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ROOT = Path(__file__).resolve().parent.parent
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DATA = ROOT / "datapacks/core/data"
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OUT = ROOT / "mod/src/main/resources/assets/cobblesurvival/jei/drop_sources.json"
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SKILLS = {"mining": "mining", "finder_ore": "ore_finder", "finder_evo": "evolution_item_finder"}
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def drop_entries(drops):
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"""Cobblemon drop table → [{item, chance (percent, absent = always), count ("a-b")}]."""
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out = []
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for e in (drops or {}).get("entries", []):
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if "item" not in e:
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continue
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entry = {"item": e["item"], "count": str(e.get("quantityRange", e.get("quantity", 1)))}
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if "percentage" in e and float(e["percentage"]) < 100:
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entry["chance"] = float(e["percentage"])
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out.append(entry)
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return out
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def species_data(jar):
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species = {}
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with zipfile.ZipFile(jar) as z:
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for name in z.namelist():
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m = re.fullmatch(r"data/cobblemon/species/[^/]+/([^/]+)\.json", name)
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if not m:
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continue
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d = json.loads(z.read(name))
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pre = d.get("preEvolution")
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species[f"cobblemon:{m[1]}"] = {
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"name": d["name"], "implemented": d.get("implemented", False), "drops": d.get("drops"),
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"pre": f"cobblemon:{pre.split()[0].lower()}" if pre else None,
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}
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# The pack's species additions replace a species' drops (datapacks/core/data/cobblesurvival/species_additions).
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for path in sorted((DATA / "cobblesurvival/species_additions").glob("*.json")):
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d = json.loads(path.read_text())
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if "drops" in d and d["target"] in species:
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species[d["target"]]["drops"] = d["drops"]
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return species
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def root_of(sid, species):
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seen = set()
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while species.get(sid, {}).get("pre") and sid not in seen:
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seen.add(sid)
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sid = species[sid]["pre"]
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return sid
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def main():
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jar = next((ROOT / "build/server/mods").glob("Cobblemon-*.jar"))
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species = species_data(jar)
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plan = json.loads((ROOT / "world/zones.json").read_text())
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zones = {z["id"]: z for z in plan["zones"] + plan["caves"] + plan.get("dimensions", [])}
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# Where each species spawns, and spawns with drops of their own.
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where = defaultdict(dict)
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spawn_drops = []
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for zid in zones:
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pool = DATA / f"cobblesurvival/spawn_pool_world/{zid}.json"
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if not pool.exists():
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continue
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for spawn in json.loads(pool.read_text())["spawns"]:
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sid = f"cobblemon:{spawn['pokemon'].split()[0].lower()}"
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a, _, b = str(spawn["level"]).partition("-")
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low, high = where[sid].get(zid, (999, 0))
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where[sid][zid] = (min(low, int(a)), max(high, int(b or a)))
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if "drops" in spawn:
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entry = {"species": sid, "zone": zid, "drops": drop_entries(spawn["drops"])}
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if entry not in spawn_drops:
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spawn_drops.append(entry)
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line_zones = defaultdict(dict)
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for sid, zs in where.items():
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for zid, levels in zs.items():
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line_zones[root_of(sid, species)].setdefault(zid, sid)
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pokemon = []
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for sid, s in sorted(species.items()):
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drops = drop_entries(s["drops"])
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root = root_of(sid, species)
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if not drops or not s["implemented"] or not (where.get(sid) or line_zones.get(root)):
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continue
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entry = {"species": sid, "drops": drops,
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"zones": [{"zone": z, "levels": f"{lo}-{hi}"} for z, (lo, hi) in sorted(where.get(sid, {}).items())]}
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if not entry["zones"]:
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entry["line"] = [{"zone": z, "species": member} for z, member in sorted(line_zones[root].items())]
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pokemon.append(entry)
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guardians = []
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for path in sorted((DATA / "cobblesurvival/guardians").glob("*.json")):
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g = json.loads(path.read_text())
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name, *props = g["pokemon"].split()
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guardians.append({"zone": g["zone"], "species": f"cobblemon:{name}",
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"level": int(next(p.split("=")[1] for p in props if p.startswith("level="))),
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"drops": g["drops"], "respawn_hours": g["respawn_hours"]})
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end = json.loads((DATA / "cobblesurvival/bosses/end.json").read_text())["end"]
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end_boss = {"species": f"cobblemon:{end['species']}", "level": end["level"], "xp_first_win": end["xp_first_win"],
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"xp": end["xp"], "respawn_hours": end["respawn_hours"],
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"first_win": [{"item": "minecraft:dragon_egg", "count": 1}]}
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machines = DATA / "cobblesurvival/machines"
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altar = json.loads((machines / "altar_core.json").read_text())["altar"]
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rebirth = json.loads((machines / "rebirth_core.json").read_text())["rebirth"]
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ore_veins = defaultdict(list)
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for ore, spec in plan["ores"].items():
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ore_veins[spec["zone"]].append({"item": spec["item"], "regen_minutes": spec["regen_minutes"]})
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finds = defaultdict(lambda: defaultdict(set))
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for path in sorted((DATA / "cobblebase/loot_table").glob("*.json")):
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prefix, _, tier = path.stem.rpartition("_")
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skill = SKILLS.get(prefix)
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if not skill:
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continue
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for pool in json.loads(path.read_text()).get("pools", []):
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for e in pool.get("entries", []):
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if e.get("type") != "minecraft:item":
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continue
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zone_conditions = [c for c in e.get("conditions", []) if c.get("condition") == "cobblesurvival:in_zone"]
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for zid in (zone_conditions[0]["zones"] if zone_conditions else ["*"]):
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finds[(skill, zid)][e["name"]].add(tier)
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pasture_finds = [{"skill": skill, "zone": None if zid == "*" else zid,
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"items": [{"item": item, "tiers": sorted(tiers)} for item, tiers in sorted(items.items())]}
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for (skill, zid), items in sorted(finds.items(), key=lambda kv: (kv[0][0], kv[0][1] != "*", kv[0][1]))]
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data = {
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"_comment": "Generated by tools/jei_sources.py from the pack's data; do not edit by hand. Read by the companion "
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"mod's JEI plugin (jei/DropSourcesJei.kt); checked against the live server by the self-test "
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"drop_sources_match_the_server.",
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"zones": {zid: {"name": z["name"], "levels": z["levels"]} for zid, z in zones.items()},
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"pokemon": pokemon, "spawn_drops": spawn_drops, "guardians": guardians, "end_boss": end_boss,
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"altar": {"tiers": altar["tiers"], "specials": altar.get("specials", [])}, "rebirth": rebirth.get("extra", []),
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"ore_veins": [{"zone": z, "items": items} for z, items in sorted(ore_veins.items())],
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"pasture_finds": pasture_finds,
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}
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OUT.parent.mkdir(parents=True, exist_ok=True)
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OUT.write_text(json.dumps(data, indent=1, ensure_ascii=False) + "\n")
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print(f"{len(pokemon)} Pokémon, {len(spawn_drops)} spawns with own drops, {len(guardians)} guardians, "
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f"{len(ore_veins)} zones with veins, {len(pasture_finds)} pasture find lists; wrote {OUT.relative_to(ROOT)}")
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if __name__ == "__main__":
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main()
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