mhtml-stream/dist/headers.js

Streaming MHTML parser

export class Headers {
    // keyed by lowercased name; the original name casing (first seen) is
    // preserved for iteration while lookups are case-insensitive, per RFC 5322
    #raw = new Map();
    [Symbol.iterator]() {
        return this.entries();
    }
    append(key, value) {
        const entry = this.#raw.get(key.toLowerCase());
        if (entry === undefined) {
            this.#raw.set(key.toLowerCase(), { key, values: [value] });
        }
        else {
            entry.values.push(value);
        }
    }
    *entries(delim = ", ") {
        for (const { key, values } of this.#raw.values()) {
            yield [key, values.join(delim)];
        }
    }
    *entriesAll() {
        for (const { key, values } of this.#raw.values()) {
            for (const val of values) {
                yield [key, val];
            }
        }
    }
    get(key, delim = ", ") {
        const entry = this.#raw.get(key.toLowerCase());
        if (entry === undefined) {
            return null;
        }
        else {
            return entry.values.join(delim);
        }
    }
    getAll(key) {
        return this.#raw.get(key.toLowerCase())?.values ?? [];
    }
    has(key) {
        return this.#raw.has(key.toLowerCase());
    }
    *keys() {
        for (const { key } of this.#raw.values()) {
            yield key;
        }
    }
    *values(delim = ", ") {
        for (const { values } of this.#raw.values()) {
            yield values.join(delim);
        }
    }
    *valuesAll() {
        for (const { values } of this.#raw.values()) {
            yield* values;
        }
    }
}