tw-stock.js

CmdUtils.CreateCommand({
  name: "tw-stock",
  author: { name: "Walter Chang", email: "[email protected]" },
  license: "Creative Commons 3.0 (by nc)",
  description: "Quote a stock symbol from Taiwan Stock Exchange",
  takes: {"stock symbol": noun_arb_text},
  preview: function(pblock, what) {
    var msg = 'Gets stock quote for "${stockSymbol}"';
    var subs = { stockSymbol: what.text };
    pblock.innerHTML = CmdUtils.renderTemplate(msg, subs);
  },
  execute: function(what) {
    this._queryQuote(what.text);
  },
  _queryQuote: function(stockSymbol) {
    function plus(n) { return n > 0 ? "+" : ""; }
    jQuery.get("http://tw.stock.yahoo.com/q/q", { s: stockSymbol }, function(content) {
      var regexps = [new RegExp('\s*<td align="center" bgcolor="#FFFfff" nowrap><b>(.+)</b></td>\s*'),
                     new RegExp('\s*<td align="center" bgcolor="#FFFfff" nowrap>([^:]+)</td>\s*')];
      var items = [];
      var lines = content.split("\n");
      for (var i in lines) {
        for (var j in regexps) {
          var matches = regexps[j].exec(lines[i]);
          if (matches != null) {
            items.push(matches[1]);
            break;
          }
        }
      }
      if (items.length == 0)
        displayMessage("Invalid stock symbol: " + stockSymbol);
      else {
        var msg = "${stockSymbol}: ${quote} ${diff} ${percentage}%"
        var quote = parseFloat(items[0]);
        var oldQuote = parseFloat(items[4]);
        var diff = quote - oldQuote;
        var percentage = diff / oldQuote * 100;
        var subs = { stockSymbol: stockSymbol, quote: quote.toFixed(2), diff: plus(diff) + diff.toFixed(2), percentage: plus(percentage) + percentage.toFixed(2) };
        displayMessage(CmdUtils.renderTemplate(msg, subs));
      }
    });
  }
});