scv-bilara/src/english.js

SuttaCentral bilara-data library

(function (exports) {
  const fs = require("fs");
  const path = require("path");
  const { logger } = require("log-instance");
  const FuzzyWordSet = require("./fuzzy-word-set");
  const FWS_URL_BASE = "https://raw.githubusercontent.com/sc-voice/scv-bilara";
  const FWS_URL = `${FWS_URL_BASE}/master/src/assets/fws-en.json`;

  var FWS_ENGLISH = { lastFetch: 0 };

  class English {
    static romanizePattern(pattern) {
      return pattern;
    }

    static async FETCH(url, opts={}) {
      let resFetch = await fetch(url);
      let data = await resFetch.json();
      return {data}
    }

    static async wordSet(opts = {}) {
      let {
        source = "https",
        fetch = English.FETCH,
        maxAge = 3600,
      } = opts;
      if (source === "https") {
        let msElapsed = Date.now() - FWS_ENGLISH.lastFetch;
        if (msElapsed / 1000 > maxAge) {
          FWS_ENGLISH.https = new Promise((resolve, reject) => {
            (async () => {
              try {
                let { data: json } = await fetch(FWS_URL);
                logger.info(`English.wordSet() fetch`, FWS_URL);
                FWS_ENGLISH.https = new FuzzyWordSet(json);
                resolve(FWS_ENGLISH.https);
              } catch (e) {
                logger.warn(
                  `English.wordSet()`,
                  `fetch ${FWS_URL} => ${e.message}.`,
                  `Loading fallback English.wordSet from file`
                );
                resolve(await English.wordSet({ source: "file" }));
              }
            })();
          });
          FWS_ENGLISH.lastFetch = Date.now();
        }
        return await FWS_ENGLISH.https;
      } else {
        if (FWS_ENGLISH.file == null) {
          let fwsPath = path.join(__dirname, "assets/fws-en.json");
          let json = JSON.parse(fs.readFileSync(fwsPath));
          FWS_ENGLISH.file = new FuzzyWordSet(json);
        }
        return FWS_ENGLISH.file;
      }
    }

  }

  module.exports = exports.English = English;
})(typeof exports === "object" ? exports : (exports = {}));