(function (hirad) {
//
// hirad - Radiance Syntax Highlighter
//
// Copyright (c) 2020-2025 Alexis Sellier
//
const selector = hirad || '.language-radiance';
const keywords = [
    'fn', 'pub', 'if', 'else', 'for', 'while', 'break', 'switch', 'match',
    'record', 'union', 'const', 'align', 'let', 'use', 'mod', 'case',
    'continue', 'return', 'true', 'false', 'loop', 'extern', 'panic',
    'device', 'register', 'catch', 'throw', 'throws',
    'at', 'mut', 'nil', 'undefined', 'static', 'in', 'is', 'where',
    'as', 'and', 'or', 'xor', 'not', 'try', 'atomic', 'select', 'trait',
    'instance', 'assert'
];
const types = ['bool', 'u8', 'u16', 'u32', 'u64', 'i8', 'i16', 'i32', 'i64', 'f32', 'void', 'opaque'];

// Syntax definition.
//
// The key becomes the class name of the span around the matched block of code.
const syntax = [
    ['comment', /(\/\/[^\n]*)/g],
    ['string' , /("(?:(?!").|\\.)*"|'[^']{1,2}')/g],
    ['number' , /\b(0x[0-9a-fA-F]+|0b[01]+|[0-9]+(?:\.[0-9]+)?)\b/g],
    ['ref'    , /(&|&'|\*)\b/g],
    ['delim'  , /(->|=>|\(|\)|\{|\}|\[|\])/g],
    ['builtin', /(@[a-zA-Z]+)/g],
    ['access' , /(\.|::)/g],
    ['op'     , /(=|!=|\.\.|\+|-|\*|\/|%|\?{1,2}|!{1,2}|>=?|<=?)/g],
    ['keyword', new RegExp('\\b(' + keywords.join('|') + ')\\b', 'g')],
    ['type'   , new RegExp('\\b(' + types.join('|') + ')\\b', 'g')],
];

const table = {};

// Encode ASCII characters to Braille to avoid conflicts between patterns.
const encode = (str) => {
    const encoded = [...str].map(c =>
        c.charCodeAt(0) <= 127 ? String.fromCharCode(c.charCodeAt(0) + 0x2800) : c
    ).join('');
    table[encoded] = str;

    return encoded;
};

// Decode Braille back to ASCII.
const decode = (str) =>
    table[str] || [...str].map(c => {
        const code = c.charCodeAt(0) - 0x2800;
        return code >= 0 && code <= 127 ? String.fromCharCode(code) : c;
    }).join('');

// Escape HTML special characters.
const escape = (str) =>
    str.replace(/</g, '&lt;').replace(/>/g, '&gt;');

// Highlight all matching elements.
for (const node of document.querySelectorAll(selector)) {
    for (const child of node.childNodes) {
        if (child.nodeType !== Node.TEXT_NODE) continue;
        if (/^\$\s/.test(child.nodeValue.trim())) continue; // Skip shell snippets.

        for (const [cls, re] of syntax) {
            child.nodeValue = child.nodeValue.replace(re, (_, m) =>
                '\u00ab' + encode(cls) + '\u00b7' +
                           encode(m)   +
                '\u00b7' + encode(cls) + '\u00bb'
            );
        }
    }
    node.innerHTML = node.innerHTML.replace(
        /\u00ab(.+?)\u00b7(.+?)\u00b7\1\u00bb/g,
        (_, name, value) => {
            value = value.replace(/\u00ab[^\u00b7]+\u00b7|\u00b7[^\u00bb]+\u00bb/g, '');
            return '<span class="' + decode(name) + '">'   +
                                     escape(decode(value)) +
                   '</span>';
        }
    );
}

})(window.hirad);