Function extract

scripts/i18n.js:146–209

(options)

}

function extract(options) {
  const keys = new Set();
  const patterns = {
    default: ['\\b(?:i18n\\(\'|i18n-key=")(\\w+)[\'"]', 1],
    json: ['__MSG_(\\w+)__', 1],
  };
  const typePatternMap = {
    '.js': 'default',
    '.json': 'json',
    '.html': 'default',
    '.vue': 'default',
  };
  const locales = new Locales(options);

  function extractFile(data, types) {
    if (!Array.isArray(types)) types = [types];
    data = String(data);
    types.forEach(function (type) {
      const patternData = patterns[type];
      const pattern = new RegExp(patternData[0], 'g');
      const groupId = patternData[1];
      let groups;
      while ((groups = pattern.exec(data))) {
        keys.add(groups[groupId]);
      }
    });
  }

  function bufferContents(file, enc, cb) {
    if (file.isNull()) return cb();
    if (file.isStream()) return this.emit('error', new PluginError('VM-i18n', 'Stream is not supported.'));
    const extname = path.extname(file.path);
    const type = typePatternMap[extname];
    if (type) extractFile(file.contents, type);
    cb();
  }

  function endStream(cb) {
    locales.load()
    .then(() => {
      keys.forEach(key => {
        locales.touch(key);
      });
      return locales.dump()
      .map(out => new Vinyl({
        path: out.path,
        contents: Buffer.from(out.data),
      }));
    })
    .then(files => {
      files.forEach(file => {
        this.push(file);
      });
      cb();
    })
    .catch(cb);
  }