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)