slm-lang/slm

var Filter = require('../filter');

/**
* Merges several statics into a single static.  Example:
*
*   ['multi',
*     ['static', 'Hello '],
*     ['static', 'World!']]
*
* Compiles to:
*
*   ['static', 'Hello World!']
*/

function StaticMerger() {}
StaticMerger.prototype = new Filter();

StaticMerger.prototype.on_multi = function(exps) {
  var res = ['multi'], node;

  for (var i = 1, l = exps.length; i < l; i++) {
    var exp = exps[i];
    if (exp[0] === 'static') {
      if (node) {
        node[1] += exp[1];
      } else {
        node = ['static', exp[1]];
        res.push(node);
      }
    } else {
      res.push(this.compile(exp));
      if (exp[0] !== 'newline') {
        node = null;
      }
    }
  }

  return res.length === 2 ? res[1] : res;
};

module.exports = StaticMerger;