# All files / src/parsers/collections collectionCore.js

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     // @flow

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

    import type {
      CollectionCoreNodeType,
      CollectionCoreValueType,
      TupleNodeType,
      NodeType
    } from '../../types'

    const SeparatorParser = P.string(',').trim(crap)

    const CollectionCoreLiteralParser = P.lazy((): mixed => {
      const TupleParser = require('./tuple').default
      const SpreadParser = P.string('...')
        .then(crap)
        .then(TupleParser)
        .node('spread')
      const SimpleListParser = P.sepBy(TupleParser, SeparatorParser).node(
        'simpleList'
      )
      return P.sepBy(P.alt(SpreadParser, SimpleListParser), SeparatorParser).map(
        (value: CollectionCoreValueType): CollectionCoreNodeType => ({
          name: 'collectionCore',
          value
        })
      )
    })

    const ComprehensionParser = P.lazy((): mixed => {
      const TupleParser = require('./tuple').default
      const ProgramParser = require('../program').default
      return P.seq(
        P.string('each')
          .then(crap)
          .then(TupleParser),
        crap.then(P.string('in')).then(crap.then(TupleParser)),
        crap
          .then(P.string('if'))
          .then(crap.then(TupleParser))
          .atMost(1),
        crap.then(ProgramParser).atMost(1)
      ).map(
        ([left, middle, condition, right]: [
          TupleNodeType,
          TupleNodeType,
          [NodeType],
          [NodeType]
        ]): CollectionCoreNodeType => {
          const extractionPart =
            right.length === 1
              ? {
                name: 'pipe',
                value: {
                  left: middle,
                  right: right[0]
                }
              }
              : middle

          const extractionPartWithOptionalCondition =
            condition.length === 1
              ? {
                name: 'pipe',
                value: {
                  left: extractionPart,
                  right: {
                    name: 'functionCall',
                    value: {
                      left: {
                        name: 'identifier',
                        value: 'filter'
                      },
                      right: {
                        name: 'lambda',
                        value: {
                          variable: 'input',
                          definition: condition[0]
                        }
                      }
                    }
                  }
                }
              }
              : extractionPart

          const mapPart = {
            name: 'functionCall',
            value: {
              left: {
                name: 'identifier',
                value: 'map'
              },
              right: {
                name: 'lambda',
                value: {
                  variable: 'input',
                  definition: left
                }
              }
            }
          }

          return {
            name: 'collectionCore',
            value: [
              {
                name: 'spread',
                value: {
                  name: 'parentheses',
                  value: {
                    name: 'pipe',
                    value: {
                      left: extractionPartWithOptionalCondition,
                      right: mapPart
                    }
                  }
                }
              }
            ]
          }
        }
      )
    })

    export default P.alt(ComprehensionParser, CollectionCoreLiteralParser)