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build.rs
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build.rs
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fn main() {
println!("cargo:rerun-if-changed=src/xml/dyes.xml");
dyes::codegen();
}
mod dyes {
use std::fs::File;
use std::io::{self, BufWriter, Write};
use std::path::PathBuf;
use serde::Deserialize;
#[derive(Deserialize)]
struct Dyes {
#[serde(rename = "category")]
categories: Vec<Category>
}
#[derive(Deserialize)]
struct Category {
#[serde(rename = "@name")]
name: String,
#[serde(rename = "@stain")]
stain: String,
#[serde(rename = "dye", default)]
dyes: Vec<Dye>
}
#[derive(Deserialize)]
struct Dye {
#[serde(rename = "@name")]
name: String,
#[serde(rename = "@stain")]
stain: String,
#[serde(rename = "@choco", default = "default_choco")]
choco: bool,
}
const fn default_choco() -> bool {
true
}
impl Dyes {
fn codegen(&self) -> io::Result<()> {
let mut path = PathBuf::from(std::env::var_os("OUT_DIR").expect("`OUT_DIR` is not defined"));
path.push("dye.rs");
let file = File::create(path)?;
let mut buf = BufWriter::new(file);
self.codegen_dyes(&mut buf)?;
self.codegen_category(&mut buf)?;
Ok(())
}
fn codegen_dyes(&self, buf: &mut impl Write) -> io::Result<()> {
let dyes: Vec<_> = self.categories
.iter()
.flat_map(|category| &category.dyes)
.filter(|dye| dye.choco)
.collect();
let variants: Vec<_> = dyes
.iter()
.map(|dye| make_pascal_case(&dye.name))
.collect();
writeln!(buf,
r#"
/// A color that can be found as the plumage of a chocobo.
///
/// Some dyes, such as vanilla yellow, are not included in this enum.
///
/// As the build script has no access to [`Rgb`], documentation of variants is rather feeble.
/// Please open an issue on GitHub if you wish to use this enum in another crate not related
/// to chocobo dyeing.
#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
#[repr(u8)]
pub enum Dye {{
{variants}
}}
impl Dye {{
/// Contains all eighty-five `Dye` variants.
pub const VALUES: [Dye; 85] = [
{values}
];
/// Returns the dye category of `self`.
///
/// # Examples
///
/// ```
/// use chocodye::{{Category, Dye}};
///
/// assert_eq!(Dye::CeruleumBlue.category(), Category::Blue);
/// ```
#[must_use]
#[inline]
pub const fn category(self) -> Category {{
use Dye::*;
match self {{
{categories}
}}
}}
/// Returns the color of `self`.
///
/// # Examples
///
/// ```
/// use chocodye::{{Dye, Rgb}};
///
/// assert_eq!(Dye::DesertYellow.color(), Rgb::new(219, 180, 87));
/// ```
#[must_use]
#[inline]
pub const fn color(self) -> Rgb {{
match self {{
{rgbs}
}}
}}
/// Returns the variant name of `self` in kebab-case.
///
/// # Examples
///
/// ```
/// use chocodye::Dye;
///
/// assert_eq!(Dye::OpoOpoBrown.short_name(), "opo-opo-brown");
/// ```
#[must_use]
#[inline]
pub const fn short_name(self) -> &'static str {{
match self {{
{names}
}}
}}
}}"#,
variants = dyes.iter().zip(&variants).enumerate().map(|(i, (dye, variant))| format!("/// `{}`\n\t{variant} = {i}", dye.stain)).collect::<Vec<_>>().join(",\n\n\t"),
values = variants.iter().map(|dye| format!("Dye::{dye}")).collect::<Vec<_>>().join(",\n\t\t"),
categories = self.categories
.iter()
.map(|category| format!("{} => Category::{}", category.dyes.iter().filter(|dye| dye.choco).map(|dye| make_pascal_case(&dye.name)).collect::<Vec<_>>().join(" | "), make_pascal_case(&category.name)))
.collect::<Vec<_>>()
.join(",\n\t\t\t"),
rgbs = dyes.iter().zip(variants.iter()).map(|(dye, name)| format!("Dye::{name} => {}", make_rgb(&dye.stain))).collect::<Vec<_>>().join(",\n\t\t\t"),
names = self.categories.iter().flat_map(|category| &category.dyes).filter(|dye| dye.choco).map(|dye| format!("Dye::{} => {:?}", make_pascal_case(&dye.name), &dye.name)).collect::<Vec<_>>().join(",\n\t\t\t")
)
}
fn codegen_category(&self, buf: &mut impl Write) -> io::Result<()> {
let categories: Vec<_> = self.categories
.iter()
.map(|category| make_pascal_case(&category.name)).
collect();
writeln!(buf, r#"
/// A category of dyes with similar hues.
#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
#[repr(u8)]
pub enum Category {{
{variants}
}}
impl Category {{
/// Contains all seven `Category` variants.
pub const VALUES: [Category; 7] = [
{values}
];
/// Returns all the dyes belonging to `self`. Dyes belong to one and only one category.
#[must_use]
#[inline]
pub const fn dyes(self) -> &'static [Dye] {{
use Dye::*;
match self {{
{dyes}
}}
}}
/// Returns a color representing `self`. Does not necessarily correspond to a dye.
#[must_use]
#[inline]
pub const fn color(self) -> Rgb {{
match self {{
{rgbs}
}}
}}
/// Returns the variant name of `self` in kebab-case.
///
/// # Examples
///
/// ```
/// use chocodye::Category;
///
/// assert_eq!(Category::Purple.short_name(), "purple");
/// ```
#[must_use]
#[inline]
pub const fn short_name(self) -> &'static str {{
match self {{
{names}
}}
}}
}}"#,
variants = categories.iter().enumerate().map(|(i, category)| format!("{category} = {i}")).collect::<Vec<_>>().join(",\n\t"),
values = categories.iter().map(|category| format!("Category::{category}")).collect::<Vec<_>>().join(",\n\t\t"),
dyes = self.categories
.iter()
.map(|category| format!(
"Category::{} => &[{}]",
make_pascal_case(&category.name),
category.dyes
.iter()
.filter(|dye| dye.choco)
.map(|dye| make_pascal_case(&dye.name))
.collect::<Vec<_>>()
.join(", ")
))
.collect::<Vec<_>>()
.join(",\n\t\t\t"),
rgbs = self.categories.iter().map(|category| format!("Category::{} => {}", make_pascal_case(&category.name), make_rgb(&category.stain))).collect::<Vec<_>>().join(",\n\t\t\t"),
names = self.categories.iter().map(|category| format!("Category::{} => {:?}", make_pascal_case(&category.name), &category.name)).collect::<Vec<_>>().join(",\n\t\t\t")
)?;
Ok(())
}
}
pub(crate) fn codegen() {
let dyes = match quick_xml::de::from_str::<Dyes>(include_str!("src/xml/dyes.xml")) {
Ok(v) => v,
Err(e) => panic!("cannot deserialize `dyes.xml`: {e}")
};
if let Err(e) = dyes.codegen() {
panic!("cannot codegen `dyes.rs`: {e}");
}
}
fn make_pascal_case(kebab_case: &str) -> String {
let mut pc = Vec::with_capacity(kebab_case.len());
let mut make_upper = true;
for mut b in kebab_case.bytes() {
if b == b'-' {
make_upper = true;
}
else {
if make_upper {
b.make_ascii_uppercase();
make_upper = false;
}
pc.push(b);
}
}
String::from_utf8(pc).expect("infallible conversion failed")
}
fn make_rgb(s: &str) -> String {
// copied from Rgb::from_hex
assert!(s.len() == 7 && s.as_bytes()[0] == b'#', "malformed color: {s:?}");
match u32::from_str_radix(&s[1..7], 16) {
Ok(v) => format!("Rgb::new({}, {}, {})", (v >> 16) & 0xFF, (v >> 8) & 0xFF, v & 0xFF),
Err(e) => panic!("malformed color: {s:?}: {e}")
}
}
}