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Current File : /var/www/html/node_modules/next/dist/server/accept-header.js

"use strict";
Object.defineProperty(exports, "__esModule", {
    value: true
});
exports.acceptLanguage = acceptLanguage;
function parse(raw, preferences, options) {
    const lowers = new Map();
    const header = raw.replace(/[ \t]/g, "");
    if (preferences) {
        let pos = 0;
        for (const preference of preferences){
            const lower = preference.toLowerCase();
            lowers.set(lower, {
                orig: preference,
                pos: pos++
            });
            if (options.prefixMatch) {
                const parts = lower.split("-");
                while(parts.pop(), parts.length > 0){
                    const joined = parts.join("-");
                    if (!lowers.has(joined)) {
                        lowers.set(joined, {
                            orig: preference,
                            pos: pos++
                        });
                    }
                }
            }
        }
    }
    const parts = header.split(",");
    const selections = [];
    const map = new Set();
    for(let i = 0; i < parts.length; ++i){
        const part = parts[i];
        if (!part) {
            continue;
        }
        const params = part.split(";");
        if (params.length > 2) {
            throw new Error(`Invalid ${options.type} header`);
        }
        let token = params[0].toLowerCase();
        if (!token) {
            throw new Error(`Invalid ${options.type} header`);
        }
        const selection = {
            token,
            pos: i,
            q: 1
        };
        if (preferences && lowers.has(token)) {
            selection.pref = lowers.get(token).pos;
        }
        map.add(selection.token);
        if (params.length === 2) {
            const q = params[1];
            const [key, value] = q.split("=");
            if (!value || key !== "q" && key !== "Q") {
                throw new Error(`Invalid ${options.type} header`);
            }
            const score = parseFloat(value);
            if (score === 0) {
                continue;
            }
            if (Number.isFinite(score) && score <= 1 && score >= 0.001) {
                selection.q = score;
            }
        }
        selections.push(selection);
    }
    selections.sort((a, b)=>{
        if (b.q !== a.q) {
            return b.q - a.q;
        }
        if (b.pref !== a.pref) {
            if (a.pref === undefined) {
                return 1;
            }
            if (b.pref === undefined) {
                return -1;
            }
            return a.pref - b.pref;
        }
        return a.pos - b.pos;
    });
    const values = selections.map((selection)=>selection.token);
    if (!preferences || !preferences.length) {
        return values;
    }
    const preferred = [];
    for (const selection1 of values){
        if (selection1 === "*") {
            for (const [preference, value] of lowers){
                if (!map.has(preference)) {
                    preferred.push(value.orig);
                }
            }
        } else {
            const lower = selection1.toLowerCase();
            if (lowers.has(lower)) {
                preferred.push(lowers.get(lower).orig);
            }
        }
    }
    return preferred;
}
function acceptLanguage(header = "", preferences) {
    return parse(header, preferences, {
        type: "accept-language",
        prefixMatch: true
    })[0] || "";
}

//# sourceMappingURL=accept-header.js.map

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