# All files / src/parsers lambda.js

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100% Branches 2/2
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     // @flow

    import P from 'parsimmon'
    import crap from './crap'
    import TupleParser from './collections/tuple'
    import IdentifierParser from './identifier'

    import type { LambdaNodeValueType, NodeType, VariableNodeType } from '../types'

    export default P.alt(
      P.seq(
        P.string('$')
          .then(IdentifierParser.atMost(1))
          .skip(crap)
          .skip(P.string('=>')),
        crap.then(TupleParser)
      ).map(
        ([variable, definition]: [
          Array<VariableNodeType>,
          NodeType
        ]): LambdaNodeValueType => ({
          variable: variable.length ? variable[0].value : 'input',
          definition
        })
      ),
      P.string('\\')
        .then(crap)
        .then(TupleParser)
        .map((definition: NodeType): LambdaNodeValueType => ({
          variable: 'input',
          definition
        }))
    )
      .trim(crap)
      .node('lambda')
      .desc('lambda')