# All files / src/parsers/math unaryOperator.js

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     // @flow

    import P from 'parsimmon'
    import crap from '../crap'

    import type {
      NodeType,
      ParserType,
      UnaryOperationNodeType,
      PrimitiveNodeType
    } from '../../types'

    const UnaryOperatorParser = P.lazy((): ParserType => {
      const OperatorParser = P.oneOf('+-!')
        .trim(crap)
        .node('primitive')
      const ProjectionParser = require('../projection').default
      return P.seq(OperatorParser.many(), ProjectionParser)
        .map(
          ([operators, operand]: [Array<PrimitiveNodeType>, NodeType]): NodeType =>
            operators.length > 0
              ? operators.reduce(
                (a: NodeType, b: PrimitiveNodeType): UnaryOperationNodeType => ({
                  name: 'unaryOperation',
                  value: {
                    operator: b,
                    operand: a
                  }
                }),
                operand
              )
              : operand
        )
        .desc('unaryOperator')
    })

    export default UnaryOperatorParser