@sctg/fontminify/plugins/ttf2woff.ts

Minify font seamlessly, font subsetter, webfont (eot, woff, svg) converter.

/**
 * @file ttf2woff
 * @author junmer eltorio
 */

/* eslint-env node */

import isTtf from 'is-ttf';

import through from 'through2';
import fe from 'fonteditor-core';
import {b2ab} from 'b3b';
import {ab2b} from 'b3b';
import replaceExt from 'replace-ext';
import {deflate} from 'pako';
import _ from 'lodash';
import type {Transform} from 'stream'
import type {PluginCloneOption} from '../index.js'

const ttf2woff = fe.ttf2woff

function compileTtf(buffer, options, cb) {
    let output;
    const ttf2woffOpts = {} as any;

    if (options.deflate) {
        ttf2woffOpts.deflate = input => {
            return deflate(Uint8Array.from(input));
        };
    }

    try {
        output = ab2b(
            // fix: have problem in some android device, close deflate
            ttf2woff(
                b2ab(buffer),
                ttf2woffOpts
            )
        );
    }
    catch (ex) {
        cb(ex);
    }

    output && cb(null, output);
}

/**
 * ttf2woff fontmin plugin
 * @api public
 */
export default (_opts?:PluginCloneOption): Transform => {

    const opts = _.extend({clone: true}, _opts);

    return through.ctor({
        objectMode: true
    }, function (file, enc, cb) {

        // check null
        if (file.isNull()) {
            cb(null, file);
            return;
        }

        // check stream
        if (file.isStream()) {
            cb(new Error('Streaming is not supported'));
            return;
        }

        // check ttf
        if (!isTtf(file.contents)) {
            cb(null, file);
            return;
        }

        // clone
        if (opts.clone) {
            this.push(file.clone(false));
        }

        // replace ext
        file.path = replaceExt(file.path, '.woff');

        compileTtf(file.contents, opts, (err, buffer) => {

            if (err) {
                cb(err);
                return;
            }

            file.contents = buffer;
            cb(null, file);
        });

    });

};