123 lines
3.6 KiB
Rust
123 lines
3.6 KiB
Rust
use std::{collections::BTreeMap, fs};
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use heck::ToShoutySnakeCase;
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use proc_macro2::TokenStream;
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use quote::{format_ident, quote};
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use serde::Deserialize;
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/// Raw deserialization shape for a single potion entry from `potion.json`.
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#[derive(Deserialize)]
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struct Potion {
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/// Numeric registry ID for this potion.
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id: u8,
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/// Status effects granted when this potion is consumed or applied.
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effects: Vec<Effect>,
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}
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/// A single status effect instance applied by a potion, as defined in `potion.json`.
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#[derive(Deserialize)]
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pub struct Effect {
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/// Namespaced effect resource location (e.g. `"minecraft:speed"`).
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effect_type: String,
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/// Duration of the effect in ticks.
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duration: i32,
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/// Amplifier level (0 = level I, 1 = level II, …).
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amplifier: u8,
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/// Whether this effect is ambient (produced by beacon, reducing particle density).
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ambient: bool,
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/// Whether particles should be displayed while the effect is active.
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show_particles: bool,
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/// Whether the effect icon should appear in the HUD.
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show_icon: bool,
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}
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impl Effect {
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/// Converts this effect entry into a `TokenStream` for use in generated code.
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pub fn to_tokens(&self) -> TokenStream {
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let effect_type = format_ident!(
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"{}",
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self.effect_type
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.strip_prefix("minecraft:")
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.unwrap()
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.to_uppercase()
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);
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let duration = self.duration;
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let amplifier = self.amplifier;
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let ambient = self.ambient;
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let show_particles = self.show_particles;
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let show_icon = self.show_icon;
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quote! {
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Effect {
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effect_type: &StatusEffect::#effect_type,
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duration: #duration,
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amplifier: #amplifier,
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ambient: #ambient,
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show_particles: #show_particles,
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show_icon: #show_icon,
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blend: false,
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}
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}
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}
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}
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/// Generates the `TokenStream` for the `Potion` struct, `Effect` struct, and `from_name` lookup.
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pub fn build() -> TokenStream {
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let potions: BTreeMap<String, Potion> =
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serde_json::from_str(&fs::read_to_string("../../assets/potion.json").unwrap())
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.expect("Failed to parse potion.json");
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let mut variants = TokenStream::new();
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let mut name_to_type = TokenStream::new();
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for (name, potion) in potions {
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let format_name = format_ident!("{}", name.to_shouty_snake_case());
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let id = potion.id;
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let slots = potion.effects;
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let slots = slots.iter().map(Effect::to_tokens);
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variants.extend([quote! {
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pub const #format_name: Self = Self {
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name: #name,
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id: #id,
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effects: &[#(#slots),*],
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};
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}]);
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name_to_type.extend(quote! { #name => Some(&Self::#format_name), });
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}
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quote! {
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use std::hash::Hash;
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use crate::effect::StatusEffect;
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pub struct Potion {
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pub id: u8,
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pub name: &'static str,
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pub effects: &'static [Effect],
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}
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#[derive(Clone)]
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pub struct Effect {
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pub effect_type: &'static StatusEffect,
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pub duration: i32,
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pub amplifier: u8,
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pub ambient: bool,
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pub show_particles: bool,
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pub show_icon: bool,
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pub blend: bool,
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}
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impl Potion {
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#variants
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#[must_use]
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pub fn from_name(name: &str) -> Option<&'static Self> {
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match name {
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#name_to_type
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_ => None
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}
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}
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}
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}
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}
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