FROM instructions do not get parsed correctly if they refer to a private registry

[rcjsuen]

We need to take into consideration the presence of multiple semi-colons in a FROM's first argument.

import { DockerfileParser } from 'dockerfile-ast';
import { TextDocument } from 'vscode-languageserver-types/lib/umd/main';

const content =
`FROM privateregistry.com:5000/image:tag
FROM localhost:1234/node:9
FROM 123.22.33.123:2345/user/image:tag2`;

let dockerfile = DockerfileParser.parse(content);
let froms = dockerfile.getFROMs();
let document = TextDocument.create("", "", 1, content);

console.log(froms[0].getImageName());
console.log(froms[1].getImageName());
console.log(froms[2].getImageName());

privateregistry.com:5000/image
localhost:1234/node
123.22.33.123:2345/user/image

[rcjsuen]

Private registries do not require a port to be specified. This makes it difficult to identify things like localhost/node as it is not possible to know that localhost is a URL and not part of the image's name...