import parser from 'solidity-parser-diligence';

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

The parse method also accepts a second argument which lets you specify the following options, in a style similar to the esprima API:

Key	Type	Default	Description
tolerant	Boolean	false	When set to `true` it will collect syntax errors and place them in a list under the key `errors` inside the root node of the returned AST. Otherwise, it will raise a `parser.ParserError`.
loc	Boolean	false	When set to `true`, it will add location information to each node, with start and stop keys that contain the corresponding line and column numbers. Column numbers start from 0, lines start from 1.
range	Boolean	false	When set to `true`, it will add range information to each node, which consists of a two-element array with start and stop character indexes in the input.

Example with location information

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 } } }

Example using a visitor to walk over the AST

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)
  }
})

Authors

Gonçalo Sá (@gnsps)

Federico Bond (@federicobond)

License

MIT

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Last updated on 13 Feb 2020

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