userscript-parser/index.js

Userscript metadata parser.

/**
 * Userscript format:
 * http://wiki.greasespot.net/Metadata_Block
 */

module.exports = function extractMetablock (userscriptText) {
  try {
    var blocksReg = /\B(\/\/ ==UserScript==\r?\n([\S\s]*?)\r?\n\/\/ ==\/UserScript==)([\S\s]*)/
    var blocks = userscriptText.match(blocksReg)

    if (!blocks) {
      return null
    }

    var metablock = blocks[1]
    var metas = blocks[2]
    var code = blocks[3]

    var meta = {}
    var metaArray = metas.split('\n')
    metaArray.forEach(function (m) {
      var parts = m.match(/@([\w-]+)\s+(.+)/)
      if (parts) {
        meta[parts[1]] = meta[parts[1]] || []
        meta[parts[1]].push(parts[2])
      }
    })

    return {
      meta: meta,
      metablock: metablock,
      content: code
    }
  } catch(e) {
    if (console) console.error(e)
    return null
  }
}