import parser from 'solidity-parser-antlr';
var input = `
    contract test {
        uint256 a;
        function f() {}
    }
`
try {
    parser.parse(input)
} catch (e) {
    if (e instanceof parser.ParserError) {
        console.log(e.errors)
    }
}

parser.parse('contract test { uint a; }', { loc: true })
// { type: 'SourceUnit',
//   children:
//    [ { type: 'ContractDefinition',
//        name: 'test',
//        baseContracts: [],
//        subNodes: [Array],
//        kind: 'contract',
//        loc: [Object] } ],
//   loc: { start: { line: 1, column: 0 }, end: { line: 1, column: 24 } } }

var ast = parser.parse('contract test { uint a; }')
// output the path of each import found
parser.visit(ast, {
  ImportDirective: function(node) {
    console.log(node.path)
  }
})