302 lines
11 KiB
Rust
302 lines
11 KiB
Rust
use proc_macro2::{Literal, TokenStream};
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use quote::{format_ident, quote};
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use crate::remap::{MappingNode, ParsedMappings, Remapper};
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use crate::version::JavaMinecraftVersion;
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/// Generates the `TokenStream` for per-version item ID remap tables and the
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/// `remap_item_id_for_version`/`remap_item_id_from_version` functions.
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pub fn build() -> TokenStream {
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// ViaBackwards mappings go new → old (26.1 → 1.21.11 → ... → 1.20.5)
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// This is the correct direction for a new server sending to old clients.
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let node_1_7_6 = MappingNode {
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version: JavaMinecraftVersion::V_1_7_6,
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value: "../../assets/viarewind/data/mappings-1.8to1.7.10.nbt",
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child: None,
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};
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let node_1_8 = MappingNode {
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version: JavaMinecraftVersion::V_1_8,
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value: "../../assets/viarewind/data/mappings-1.9.4to1.8.nbt",
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child: Some(&node_1_7_6),
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};
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let node_1_9 = MappingNode {
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version: JavaMinecraftVersion::V_1_9,
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value: "../../assets/viabackwards/data/mappings-1.10to1.9.4.nbt",
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child: Some(&node_1_8),
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};
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let node_1_10 = MappingNode {
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version: JavaMinecraftVersion::V_1_10,
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value: "../../assets/viabackwards/data/mappings-1.11to1.10.nbt",
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child: Some(&node_1_9),
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};
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let node_1_11 = MappingNode {
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version: JavaMinecraftVersion::V_1_11,
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value: "../../assets/viabackwards/data/mappings-1.12to1.11.nbt",
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child: Some(&node_1_10),
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};
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let node_1_12 = MappingNode {
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version: JavaMinecraftVersion::V_1_12,
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value: "../../assets/viabackwards/data/mappings-1.13to1.12.nbt",
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child: Some(&node_1_11),
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};
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let node_1_13 = MappingNode {
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version: JavaMinecraftVersion::V_1_13,
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value: "../../assets/viabackwards/data/mappings-1.13.2to1.13.nbt",
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child: Some(&node_1_12),
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};
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let node_1_13_2 = MappingNode {
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version: JavaMinecraftVersion::V_1_13_2,
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value: "../../assets/viabackwards/data/mappings-1.14to1.13.2.nbt",
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child: Some(&node_1_13),
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};
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let node_1_14 = MappingNode {
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version: JavaMinecraftVersion::V_1_14,
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value: "../../assets/viabackwards/data/mappings-1.15to1.14.nbt",
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child: Some(&node_1_13_2),
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};
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let node_1_15 = MappingNode {
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version: JavaMinecraftVersion::V_1_15,
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value: "../../assets/viabackwards/data/mappings-1.16to1.15.nbt",
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child: Some(&node_1_14),
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};
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let node_1_16 = MappingNode {
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version: JavaMinecraftVersion::V_1_16,
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value: "../../assets/viabackwards/data/mappings-1.16.2to1.16.nbt",
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child: Some(&node_1_15),
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};
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let node_1_16_2 = MappingNode {
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version: JavaMinecraftVersion::V_1_16_2,
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value: "../../assets/viabackwards/data/mappings-1.17to1.16.2.nbt",
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child: Some(&node_1_16),
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};
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let node_1_17 = MappingNode {
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version: JavaMinecraftVersion::V_1_17,
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value: "../../assets/viabackwards/data/mappings-1.18to1.17.nbt",
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child: Some(&node_1_16_2),
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};
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let node_1_18 = MappingNode {
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version: JavaMinecraftVersion::V_1_18,
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value: "../../assets/viabackwards/data/mappings-1.19to1.18.nbt",
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child: Some(&node_1_17),
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};
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let node_1_19 = MappingNode {
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version: JavaMinecraftVersion::V_1_19,
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value: "../../assets/viabackwards/data/mappings-1.19.3to1.19.nbt",
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child: Some(&node_1_18),
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};
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let node_1_19_3 = MappingNode {
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version: JavaMinecraftVersion::V_1_19_3,
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value: "../../assets/viabackwards/data/mappings-1.19.4to1.19.3.nbt",
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child: Some(&node_1_19),
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};
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let node_1_19_4 = MappingNode {
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version: JavaMinecraftVersion::V_1_19_4,
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value: "../../assets/viabackwards/data/mappings-1.20to1.19.4.nbt",
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child: Some(&node_1_19_3),
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};
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let node_1_20 = MappingNode {
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version: JavaMinecraftVersion::V_1_20,
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value: "../../assets/viabackwards/data/mappings-1.20.2to1.20.nbt",
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child: Some(&node_1_19_4),
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};
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let node_1_20_2 = MappingNode {
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version: JavaMinecraftVersion::V_1_20_2,
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value: "../../assets/viabackwards/data/mappings-1.20.3to1.20.2.nbt",
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child: Some(&node_1_20),
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};
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let node_1_20_3 = MappingNode {
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version: JavaMinecraftVersion::V_1_20_3,
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value: "../../assets/viabackwards/data/mappings-1.20.5to1.20.3.nbt",
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child: Some(&node_1_20_2),
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};
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let node_1_20_5 = MappingNode {
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version: JavaMinecraftVersion::V_1_20_5,
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value: "../../assets/viabackwards/data/mappings-1.21to1.20.5.nbt",
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child: Some(&node_1_20_3),
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};
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let node_1_21 = MappingNode {
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version: JavaMinecraftVersion::V_1_21,
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value: "../../assets/viabackwards/data/mappings-1.21.2to1.21.nbt",
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child: Some(&node_1_20_5),
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};
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let node_1_21_2 = MappingNode {
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version: JavaMinecraftVersion::V_1_21_2,
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value: "../../assets/viabackwards/data/mappings-1.21.4to1.21.2.nbt",
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child: Some(&node_1_21),
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};
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let node_1_21_4 = MappingNode {
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version: JavaMinecraftVersion::V_1_21_4,
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value: "../../assets/viabackwards/data/mappings-1.21.5to1.21.4.nbt",
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child: Some(&node_1_21_2),
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};
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let node_1_21_5 = MappingNode {
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version: JavaMinecraftVersion::V_1_21_5,
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value: "../../assets/viabackwards/data/mappings-1.21.6to1.21.5.nbt",
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child: Some(&node_1_21_4),
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};
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let node_1_21_6 = MappingNode {
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version: JavaMinecraftVersion::V_1_21_6,
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value: "../../assets/viabackwards/data/mappings-1.21.7to1.21.6.nbt",
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child: Some(&node_1_21_5),
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};
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let node_1_21_7 = MappingNode {
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version: JavaMinecraftVersion::V_1_21_7,
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value: "../../assets/viabackwards/data/mappings-1.21.9to1.21.7.nbt",
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child: Some(&node_1_21_6),
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};
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let node_1_21_9 = MappingNode {
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version: JavaMinecraftVersion::V_1_21_9,
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value: "../../assets/viabackwards/data/mappings-1.21.11to1.21.9.nbt",
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child: Some(&node_1_21_7),
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};
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let node_1_21_11 = MappingNode {
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version: JavaMinecraftVersion::V_1_21_11,
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value: "../../assets/viabackwards/data/mappings-26.1to1.21.11.nbt",
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child: Some(&node_1_21_9),
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};
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let node_26_1 = MappingNode {
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version: JavaMinecraftVersion::V_26_1,
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value: "../../assets/viabackwards/data/mappings-26.2to26.1.nbt",
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child: Some(&node_1_21_11),
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};
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let node_26_2 = MappingNode {
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version: JavaMinecraftVersion::V_26_2,
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value: "../../assets/viabackwards/data/mappings-26.3to26.2.nbt",
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child: Some(&node_26_1),
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};
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let remapper: Remapper<_, Option<Vec<u16>>> = Remapper {
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version: JavaMinecraftVersion::V_26_3,
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remapper: |first, second| match (first, second) {
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(Some(first), Some(second)) => Some(
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first
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.iter()
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.map(|id| second.get(usize::from(*id)).copied().unwrap_or(0))
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.collect(),
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),
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(None, Some(second)) => Some(
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(0..second.len())
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.map(|id| second.get(id).copied().unwrap_or(0))
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.collect(),
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),
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(Some(first), None) => Some(first.clone()),
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_ => None,
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},
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serializer: |&file| {
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ParsedMappings::parse_mapping_file(file, "items").map(|mappings| mappings.to_u16(file))
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},
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};
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let all_mappings = remapper.process(&node_26_2);
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let mapping_size = all_mappings
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.iter()
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.flat_map(|(_, mapping)| {
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mapping
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.as_ref()
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.map(|m| m.iter().copied().max().unwrap_or(0))
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})
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.max()
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.unwrap_or(0) as usize
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+ 1;
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let mut static_values = TokenStream::new();
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let mut match_arms_id_for_ver = TokenStream::new();
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let mut match_arms_id_from_ver = TokenStream::new();
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for (ver, mapping) in &all_mappings {
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let versions = crate::remap::version_patterns(*ver);
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// Forward: 26.1 → old version (for sending to old clients)
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{
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let ident = format_ident!(
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"{}",
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format!("ITEM_ID_REMAP_{:?}_TO_{:?}", remapper.version, ver).to_uppercase()
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);
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let mapping_tokens: Vec<_> = mapping
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.as_ref()
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.unwrap()
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.iter()
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.copied()
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.map(Literal::u16_unsuffixed)
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.collect();
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static_values.extend(quote! {
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const #ident: &[u16] = &[#(#mapping_tokens),*];
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});
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match_arms_id_for_ver.extend(quote! {
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#(#versions)|* => #ident
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.get(usize::from(item_id))
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.copied()
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.unwrap_or(item_id),
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});
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}
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// Reverse: old version → 26.1 (for receiving from old clients)
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{
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let reversed = reverse_mapping(mapping.as_ref().unwrap(), mapping_size);
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let ident = format_ident!(
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"{}",
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format!("ITEM_ID_REMAP_{:?}_TO_{:?}", ver, remapper.version).to_uppercase()
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);
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let mapping_tokens: Vec<_> =
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reversed.into_iter().map(Literal::u16_unsuffixed).collect();
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static_values.extend(quote! {
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const #ident: &[u16] = &[#(#mapping_tokens),*];
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});
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match_arms_id_from_ver.extend(quote! {
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#(#versions)|* => #ident
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.get(usize::from(item_id))
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.copied()
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.unwrap_or(item_id),
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});
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}
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}
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quote! {
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use pumpkin_util::version::JavaMinecraftVersion;
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#static_values
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#[must_use]
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pub fn remap_item_id_for_version(item_id: u16, version: JavaMinecraftVersion) -> u16 {
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match version {
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#match_arms_id_for_ver
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_ => item_id,
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}
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}
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#[must_use]
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pub fn remap_item_id_from_version(item_id: u16, version: JavaMinecraftVersion) -> u16 {
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match version {
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#match_arms_id_from_ver
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_ => item_id,
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}
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}
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}
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}
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/// Builds old-id → latest-id. Several latest items may share one old id (new
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/// items fallback to a similar existing item). Keep the first writer: original
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/// items have lower ids than later fallbacks, so a 1.21.6 diamond sword maps
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/// back to diamond sword instead of diamond spear.
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fn reverse_mapping(mapping: &[u16], mapped_size: usize) -> Vec<u16> {
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let mut result = vec![0u16; mapped_size];
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for (new_id, old_id) in mapping.iter().enumerate() {
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let old_id = *old_id as usize;
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if old_id != 0 && old_id < mapped_size && result[old_id] == 0 {
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result[old_id] = new_id as u16;
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}
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}
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result
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}
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#[cfg(test)]
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mod tests {
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use super::reverse_mapping;
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#[test]
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fn reverse_mapping_prefers_original_item_over_later_fallback() {
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// Latest ids: 2 = original sword, 4 = spear that ViaBackwards aliases to the same old id.
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let mapping = vec![0, 1, 5, 3, 5];
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let reversed = reverse_mapping(&mapping, 8);
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assert_eq!(reversed[5], 2);
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}
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}
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