node_modules/postcss-reporter/lib/util.js

var _ = require('lodash');

exports.getLocation = function(message) {
  var messageNode = message.node;

  var location = {
    line: message.line,
    column: message.column,
  };

  var messageInput = _.get(messageNode, 'source.input');

  if (!messageInput) return location;

  var originLocation = messageInput.origin && messageInput.origin(message.line, message.column)
  if (originLocation) return originLocation

  location.file = messageInput.file || messageInput.id;
  return location;
};