ENVs and LABELs improperly parsed if they use variable replacement and is delimited with a =

[rcjsuen]

The code below will produce the following output.

It seems that the parsing is fine if it is delimited by a space (which makes sense because the parser will just take everything after the space). Using a = will trigger the failure as it stops parsing the property after the second matching ' is found and proceeds to start reading the rest of the content as a new property.

2
${bundle_without:-'development test'
2
${bundle_without:-'development test'
1
${bundle_without:-'development test'}
1
${bundle_without:-'development test'}

import { DockerfileParser } from 'dockerfile-ast';

const content =
"FROM scratch\n" +
"ENV BUNDLE_WITHOUT=${bundle_without:-'development test'}\n" +
"LABEL BUNDLE_WITHOUT=${bundle_without:-'development test'}\n" +
"ENV BUNDLE_WITHOUT ${bundle_without:-'development test'}\n" +
"LABEL BUNDLE_WITHOUT ${bundle_without:-'development test'}\n";

let dockerfile = DockerfileParser.parse(content);
let env = dockerfile.getInstructions()[1] as Env;
let label = dockerfile.getInstructions()[2] as Label;
let env2 = dockerfile.getInstructions()[3] as Env;
let label2 = dockerfile.getInstructions()[4] as Label;

let property = env.getProperties()[0];
console.log(env.getProperties().length);
console.log(property.getValue());

property = label.getProperties()[0];
console.log(label.getProperties().length);
console.log(property.getValue());

property = env2.getProperties()[0];
console.log(env2.getProperties().length);
console.log(property.getValue());

property = label2.getProperties()[0];
console.log(label2.getProperties().length);
console.log(property.getValue());