tppl模板引擎开发实践

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字符串拼接

function tppl(tpl, data, fast) {
  var fn = function(d) {
    var i,
      k = [],
      v = [];
    for (i in d) {
      k.push(i);
      v.push(d[i]);
    }
    return (new Function(k, fn.$)).apply(d, v);
  };
  if (!fn.$) {
    fn.$ = 'var $=""\n';
    var tpls = tpl.replace(/[\r\t\n]/g, " ").replace(/\s+/g, ' ').split('%>'),
      i = 0;
    while (i < tpls.length) {
      var p = tpls[i].replace(/\'/g, "\"");
      var x = p.indexOf('<%');
      if (p[x + 2] == '=') {
        //<%=..%>
        fn.$ += "$+='" + p.substr(0, x) + "'\n";
        fn.$ += "$+=" + p.substr(x + 3) + "\n";
      } else if (x >= 0) {
        //<% %>
        fn.$ += "$+='" + p.substr(0, x) + "'\n";
        fn.$ += p.substr(x + 2) + "\n";
      } else {
        //html
        fn.$ += "$+='" + p + "'\n";
      }
      i++;
    }
    fn.$ += "return $";
  }
  return data ? fn(data) : fn;
}
module.exports = tppl;