Riven/riven/srcgen/consts/champion.rs.dt

{{
    const dotUtils = require('./dotUtils.js');
    const champions = require('./.champion.json')
        .filter(({ id }) => id > 0)
        .sortBy(({ name }) => name);

    const constName = name => dotUtils.changeCase.constantCase(name).replace(/[^_A-Z0-9]+/g, '');
    const constNamePad = 12;

    const hashFactor = 256;
    const strHash = (str) => {
        let h = 0;
        for (const c of str)
            h = hashFactor * h + c.charCodeAt(0);
        return h;
    };
}}{{= dotUtils.preamble() }}

use serde::{ Serialize, Deserialize };

newtype_enum! {
    /// A League of Legends champion.
    ///
    /// This newtype acts as a C-like enum; each variant corresponds to an
    /// integer value. Using a newtype allows _unknown_ variants to be
    /// represented. This is important when Riot adds new champions.
    ///
    /// Field | Name | Identifier | Id
    /// ---|---|---|---
{{
    for (const { id, alias, name } of champions) {
}}
    /// `{{= constName(name) }}` | "{{= name }}" | "{{= alias }}" | {{= id }}
{{
    }
}}
    #[derive(Serialize, Deserialize)]
    #[serde(transparent)]
    pub newtype_enum Champion(i16) {
{{
    for (const { id, alias, name } of champions) {
}}
        {{= constName(name) }} = {{= id }},
{{
    }
}}
    }
}

impl Champion {
    /// The champion's name (`en_US` localization).
    pub const fn name(self) -> Option<&'static str> {
        match self {
{{
    for (const { name } of champions) {
}}
            Self::{{= constName(name).padEnd(constNamePad) }} => Some("{{= name }}"),
{{
    }
}}
            _ => None,
        }
    }

    /// The champion's identifier key. Somtimes called "key", "identifier", or "alias".
    /// This is mainly used in DDragon paths.
    ///
    /// This is generally the `en_US` name with spaces and punctuation removed,
    /// capitalization preserved, however the follow are exceptions:
    ///
    /// Field | Name | Identifier | Id
    /// ---|---|---|---
{{
    for (const { id, alias, name } of champions) {
        if (name.replace(/[^a-zA-Z0-9]+/, '') !== alias) {
}}
    /// `{{= constName(name) }}` | "{{= name }}" | "{{= alias }}" | {{= id }}
{{
        }
    }
}}
    pub const fn identifier(self) -> Option<&'static str> {
        match self {
{{
    for (const { name, alias } of champions) {
}}
            Self::{{= constName(name).padEnd(constNamePad) }} => Some("{{= alias }}"),
{{
    }
}}
            _ => None,
        }
    }
}

impl std::str::FromStr for Champion {
    type Err = ();
    fn from_str(s: &str) -> Result<Self, Self::Err> {
        match s.chars()
            .take(4)
            .filter(|c| c.is_ascii_alphanumeric())
            .fold(0_u32, |hash, next| hash * {{= hashFactor }} + u32::from(next))
        {
{{
    const keyStrings = (name, alias) => new Set([].concat(...[ name, alias ].map(s => s.toUpperCase())
        .map(s => [
            s.replace(/[^A-Z0-9]+/, '').substring(0, 4),
            s.split(/[^A-Z0-9]/, 1)[0].substring(0, 4),
            s.split(/[^A-Z]/, 1)[0].substring(0, 4),
        ])));
    for (const { id, alias, name } of champions) {
        for (const prefix of keyStrings(name, alias)) {
}}
            0x{{= strHash(prefix).toString(16).padEnd(8) }} /* {{= prefix.padEnd(4) }} */ => Ok(Champion::{{= constName(name) }}),
{{
        }
    }
}}
            _ => Err(()),
        }
    }
}

impl std::convert::TryFrom<&str> for Champion {
    type Error = <Self as std::str::FromStr>::Err;
    fn try_from(value: &str) -> Result<Self, Self::Error> {
        <Self as std::str::FromStr>::from_str(value)
    }
}