parseOne method
Parses a single line into a key-value pair.
Implementation
@visibleForTesting
Map<String, String> parseOne(String line,
{Map<String, String> env = const {}}) {
var stripped = strip(line);
if (!_isValid(stripped)) return {};
var idx = stripped.indexOf('=');
var lhs = stripped.substring(0, idx);
var k = swallow(lhs);
if (k.isEmpty) return {};
var rhs = stripped.substring(idx + 1, stripped.length).trim();
var quotChar = surroundingQuote(rhs);
var v = unquote(rhs);
if (quotChar == _singleQuot) {
return {k: v};
}
return {k: interpolate(v, env)};
}