Web/kzcms/ckfinder/plugins/fileeditor/codemirror/js/stringstream.js

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/* String streams are the things fed to parsers (which can feed them
 * to a tokenizer if they want). They provide peek and next methods
 * for looking at the current character (next 'consumes' this
 * character, peek does not), and a get method for retrieving all the
 * text that was consumed since the last time get was called.
 *
 * An easy mistake to make is to let a StopIteration exception finish
 * the token stream while there are still characters pending in the
 * string stream (hitting the end of the buffer while parsing a
 * token). To make it easier to detect such errors, the stringstreams
 * throw an exception when this happens.
 */

// Make a stringstream stream out of an iterator that returns strings.
// This is applied to the result of traverseDOM (see codemirror.js),
// and the resulting stream is fed to the parser.
var stringStream = function(source){
  // String that's currently being iterated over.
  var current = "";
  // Position in that string.
  var pos = 0;
  // Accumulator for strings that have been iterated over but not
  // get()-ed yet.
  var accum = "";
  // Make sure there are more characters ready, or throw
  // StopIteration.
  function ensureChars() {
    while (pos == current.length) {
      accum += current;
      current = ""; // In case source.next() throws
      pos = 0;
      try {current = source.next();}
      catch (e) {
        if (e != StopIteration) throw e;
        else return false;
      }
    }
    return true;
  }

  return {
    // peek: -> character
    // Return the next character in the stream.
    peek: function() {
      if (!ensureChars()) return null;
      return current.charAt(pos);
    },
    // next: -> character
    // Get the next character, throw StopIteration if at end, check
    // for unused content.
    next: function() {
      if (!ensureChars()) {
        if (accum.length > 0)
          throw "End of stringstream reached without emptying buffer ('" + accum + "').";
        else
          throw StopIteration;
      }
      return current.charAt(pos++);
    },
    // get(): -> string