import-maps/lib/parser.js

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.parseFromString = void 0;
const assert_1 = __importDefault(require("assert"));
const utils_1 = require("./utils");
function parseFromString(input, baseURL) {
    const parsed = JSON.parse(input);
    if (!isJSONObject(parsed)) {
        throw new TypeError("Import map JSON must be an object.");
    }
    let sortedAndNormalizedImports = {};
    if ("imports" in parsed) {
        if (!isJSONObject(parsed.imports)) {
            throw new TypeError("Import map's imports value must be an object.");
        }
        sortedAndNormalizedImports = sortAndNormalizeSpecifierMap(parsed.imports, baseURL);
    }
    let sortedAndNormalizedScopes = {};
    if ("scopes" in parsed) {
        if (!isJSONObject(parsed.scopes)) {
            throw new TypeError("Import map's scopes value must be an object.");
        }
        sortedAndNormalizedScopes = sortAndNormalizeScopes(parsed.scopes, baseURL);
    }
    const badTopLevelKeys = new Set(Object.keys(parsed));
    badTopLevelKeys.delete("imports");
    badTopLevelKeys.delete("scopes");
    for (const badKey of badTopLevelKeys) {
        console.warn(`Invalid top-level key "${badKey}". Only "imports" and "scopes" can be present.`);
    }
    // Always have these two keys, and exactly these two keys, in the result.
    return {
        imports: sortedAndNormalizedImports,
        scopes: sortedAndNormalizedScopes,
    };
}
exports.parseFromString = parseFromString;
function sortAndNormalizeSpecifierMap(obj, baseURL) {
    assert_1.default(isJSONObject(obj));
    const normalized = {};
    for (const [specifierKey, value] of Object.entries(obj)) {
        const normalizedSpecifierKey = normalizeSpecifierKey(specifierKey, baseURL);
        if (normalizedSpecifierKey === null) {
            continue;
        }
        if (typeof value !== "string") {
            console.warn(`Invalid address ${JSON.stringify(value)} for the specifier key "${specifierKey}". ` +
                `Addresses must be strings.`);
            normalized[normalizedSpecifierKey] = null;
            continue;
        }
        const addressURL = utils_1.tryURLLikeSpecifierParse(value, baseURL);
        if (addressURL === null) {
            console.warn(`Invalid address "${value}" for the specifier key "${specifierKey}".`);
            normalized[normalizedSpecifierKey] = null;
            continue;
        }
        if (specifierKey.endsWith("/") && !addressURL.href.endsWith("/")) {
            console.warn(`Invalid address "${addressURL.href}" for package specifier key "${specifierKey}". ` +
                `Package addresses must end with "/".`);
            normalized[normalizedSpecifierKey] = null;
            continue;
        }
        normalized[normalizedSpecifierKey] = addressURL;
    }
    const sortedAndNormalized = {};
    const sortedKeys = Object.keys(normalized).sort((a, b) => codeUnitCompare(b, a));
    for (const key of sortedKeys) {
        sortedAndNormalized[key] = normalized[key];
    }
    return sortedAndNormalized;
}
function sortAndNormalizeScopes(obj, baseURL) {
    const normalized = {};
    for (const [scopePrefix, potentialSpecifierMap] of Object.entries(obj)) {
        if (!isJSONObject(potentialSpecifierMap)) {
            throw new TypeError(`The value for the "${scopePrefix}" scope prefix must be an object.`);
        }
        const scopePrefixURL = utils_1.tryURLParse(scopePrefix, baseURL);
        if (scopePrefixURL === null) {
            console.warn(`Invalid scope "${scopePrefix}" (parsed against base URL "${baseURL}").`);
            continue;
        }
        const normalizedScopePrefix = scopePrefixURL.href;
        normalized[normalizedScopePrefix] = sortAndNormalizeSpecifierMap(potentialSpecifierMap, baseURL);
    }
    const sortedAndNormalized = {};
    const sortedKeys = Object.keys(normalized).sort((a, b) => codeUnitCompare(b, a));
    for (const key of sortedKeys) {
        sortedAndNormalized[key] = normalized[key];
    }
    return sortedAndNormalized;
}
function normalizeSpecifierKey(specifierKey, baseURL) {
    // Ignore attempts to use the empty string as a specifier key
    if (specifierKey === "") {
        console.warn(`Invalid empty string specifier key.`);
        return null;
    }
    const url = utils_1.tryURLLikeSpecifierParse(specifierKey, baseURL);
    if (url !== null) {
        return url.href;
    }
    return specifierKey;
}
function isJSONObject(value) {
    return typeof value === "object" && value !== null && !Array.isArray(value);
}
function codeUnitCompare(a, b) {
    if (a > b) {
        return 1;
    }
    /* istanbul ignore else */
    if (b > a) {
        return -1;
    }
    /* istanbul ignore next */
    throw new Error("This should never be reached because this is only used on JSON object keys");
}