Acme.BookStore.HttpApi.Host/node_modules/ret/lib/index.js

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var util      = require('./util');
var types     = require('./types');
var sets      = require('./sets');
var positions = require('./positions');


module.exports = function(regexpStr) {
  var i = 0, l, c,
      start = { type: types.ROOT, stack: []},

      // Keep track of last clause/group and stack.
      lastGroup = start,
      last = start.stack,
      groupStack = [];


  var repeatErr = function(i) {
    util.error(regexpStr, 'Nothing to repeat at column ' + (i - 1));
  };

  // Decode a few escaped characters.
  var str = util.strToChars(regexpStr);
  l = str.length;

  // Iterate through each character in string.
  while (i < l) {
    c = str[i++];

    switch (c) {
      // Handle escaped characters, inclues a few sets.
      case '\\':
        c = str[i++];

        switch (c) {
          case 'b':
            last.push(positions.wordBoundary());
            break;

          case 'B':
            last.push(positions.nonWordBoundary());
            break;

          case 'w':
            last.push(sets.words());
            break;

          case 'W':
            last.push(sets.notWords());
            break;

          case 'd':
            last.push(sets.ints());
            break;

          case 'D':
            last.push(sets.notInts());
            break;

          case 's':
            last.push(sets.whitespace());