Small Node.js script to strip document blocking rules. (See https://issues.adblockplus.org/ticket/4280 )

strip.js

"use strict";

let fs = require("fs");

if (process.argv.length != 3)
{
  console.log("Usage: nodejs strip.js filename.json");
  process.exit(1);
}
let filename = process.argv[2];

fs.readFile(filename, "utf8", (error, data) =>
{
  if (error)
  {
    console.log(error);
    process.exit(1);
  }

  let stripped = JSON.stringify(
    JSON.parse(data).map(rule =>
    {
      if (rule.action.type != "block")
        return rule;

      let resource_type = rule.trigger["resource-type"];
      let document_index = resource_type.indexOf("document");
      if (document_index > -1)
        resource_type.splice(document_index, 1);

      return resource_type.length == 0 ? null : rule;
    }).filter(rule => rule != null)
  , null, "\t");

  fs.writeFile(filename, stripped, error =>
  {
    if (error)
    {
      console.log(error);
      process.exit(1);
    }
  });
});