utils.js

var cloneRegexp = require('clone-regexp');

// Copied from:
// https://github.com/timmfin/broccoli-sprockets-dependencies/blob/4f20be3924d93577c156b3385fc9f2900af6a595/resolver.coffee#L13-L34

var HEADER_PATTERN = /^(?:\s*((?:\/[*](?:\s*|.+?)*?[*]\/)|(?:\#\#\#\n(?:[\s\S]*)\n\#\#\#)|(?:\/\/.*\n?)+|(?:\#.*\n?)+)*)*/m;
var DIRECTIVE_PATTERN = /^(\W*=)\s*(\w+)\s*(.*?)(\*\/)?$/gm;



function extractHeader(content, customHeaderPattern) {
  var headerPattern = cloneRegexp(customHeaderPattern || HEADER_PATTERN);

  // Must be at the very beginning of the file
  if ((match = headerPattern.exec(content)) && match && match.index === 0) {
    return match[0];
  }
}


module.exports = {
  HEADER_PATTERN: HEADER_PATTERN,
  DIRECTIVE_PATTERN: DIRECTIVE_PATTERN,

  extractHeader: extractHeader
};