report node-mapnik validty/simplicity

.js

#!/usr/bin/env node

"use strict";

var exists = require('fs').existsSync || require('path').existsSync;
var fs = require('fs');
var usage = 'usage:';
usage += '\n  mapnik-info.js <tile.mvt> z x y';

var tile = process.argv[2];

if (!tile) {
   console.log(usage);
   process.exit(1);
}

if (!exists(tile)) {
    console.log(tile + ' does not exist');
    process.exit(1);
}

var z = process.argv[3];
var x = process.argv[4];
var y = process.argv[5];

var mapnik = require('../');
mapnik.register_default_input_plugins();

var vt = new mapnik.VectorTile(parseInt(z), parseInt(x), parseInt(y));
var buffer = fs.readFileSync(tile);
vt.addData(buffer);
console.log('VALIDITY');
var val = vt.reportGeometryValiditySync();
val.forEach(function(v) {
  console.log(v.message);
  console.log('\n');
})
console.log('SIMPLICITY');
console.log(vt.reportGeometrySimplicitySync());