All files / src/parsers projection.js

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// @flow
 
import P from 'parsimmon'
import crap from './crap'
import { StringParserRegExp } from './primitive'
import IdentifierParser from './identifier'
 
import type {
  ListNodeType,
  ProjectionNodeType,
  ObjectProjectionNodeType,
  SimpleObjectProjectionItemType,
  ValuePropNodeType,
  ProjectableNodeType,
  NodeType,
  ObjectProjectionItemType,
  FragmentObjectProjectionItemType
} from '../types'
 
type WrappedObjectProjectionNodeType = {
  name: 'objectProjection',
  value: Array<ObjectProjectionItemType>
};
type WrappedProjectionNodeType =
  | {name: 'projection', value: ListNodeType}
  | {name: 'valueProp', value: string}
  | WrappedObjectProjectionNodeType;
 
type WrappedProjectionNodeWithOptionalType =
  | {
      name: 'projection',
      value: {name: 'projection', value: ListNodeType},
      optional: boolean
    }
  | {name: 'valueProp', value: string, optional: boolean}
  | {
      name: 'objectProjection',
      value: Array<ObjectProjectionItemType>,
      optional: boolean
    };
 
const packList = (x: ListNodeType): WrappedProjectionNodeType => ({
  value: x,
  name: 'projection'
})
 
const packProperty = (x: string): WrappedProjectionNodeType => ({
  value: x,
  name: 'valueProp'
})
 
const unpackOne = (
  projectable: | ProjectableNodeType
    | ProjectionNodeType
    | ValuePropNodeType
    | ObjectProjectionNodeType,
  projection: WrappedProjectionNodeWithOptionalType
): | ProjectionNodeType
  | ValuePropNodeType
  | ProjectableNodeType
  | ObjectProjectionNodeType => {
  switch (projection.name) {
    case 'projection':
      return {
        name: 'projection',
        value: {
          optional: projection.optional,
          left: projectable,
          right: projection.value.value
        }
      }
    case 'valueProp':
      return {
        name: 'valueProp',
        value: {
          optional: projection.value[0] === '?',
          left: projectable,
          right:
            projection.value[0] === '?'
              ? projection.value.slice(1)
              : projection.value
        }
      }
    default:
      return {
        name: 'objectProjection',
        value: {
          left: projectable,
          optional: false,
          right: projection.value
        }
      }
  }
}
 
const PropertyParser = P.regexp(/\??(\.[$A-Z_][0-9A-Z_$]*)+/i).map(
  packProperty
)
 
const ObjectProjectionParser = P.lazy((): mixed => {
  const SimpleItemParser = P.alt(
    P.regex(StringParserRegExp).map((value: string): string =>
      value.slice(1, -1)
    ),
    IdentifierParser.map(({ value }: {value: string}): string => value)
  ).map((value: string): ObjectProjectionItemType => ({
    type: 'SimpleItem',
    value
  }))
  const RecursiveItemParser = P.seq(
    SimpleItemParser,
    crap.then(ObjectProjectionParser.atMost(1))
  ).map(
    (
      segments: [
        SimpleObjectProjectionItemType,
        [WrappedObjectProjectionNodeType]
      ]
    ): ObjectProjectionItemType =>
      segments[1].length === 0
        ? segments[0]
        : {
          type: 'RecursiveItem',
          name: segments[0].value,
          value: segments[1][0]
        }
  )
 
  const AliasParser = P.seq(SimpleItemParser, P.string(':').trim(crap))
 
  const AliasableItemParser = P.seq(
    AliasParser.atMost(1),
    RecursiveItemParser
  ).map(
    ([alias, item]: [
      [ObjectProjectionNodeType, string],
      ObjectProjectionNodeType
    ]): ObjectProjectionNodeType =>
      alias.length === 1 ? { ...item, alias: alias[0][0].value } : item
  )
 
  const FragmentParser = P.string('...')
    .then(crap)
    .then(IdentifierParser)
    .map((value: {value: string}): FragmentObjectProjectionItemType => ({
      type: 'FragmentItem',
      value: value.value
    }))
 
  return P.sepBy(
    P.alt(AliasableItemParser, FragmentParser),
    P.string(',')
      .atMost(1)
      .trim(crap)
  )
    .wrap(P.string('{').then(crap), crap.then(P.string('}')))
    .map(
      (value: Array<ObjectProjectionItemType>): WrappedProjectionNodeType => ({
        name: 'objectProjection',
        value
      })
    )
})
 
const unpack = ([projectable, projections]: [
  ProjectableNodeType,
  Array<WrappedProjectionNodeWithOptionalType>
]): | ProjectionNodeType
  | ValuePropNodeType
  | ProjectableNodeType
  | ObjectProjectionNodeType => projections.reduce(unpackOne, projectable)
 
const SimpleProjectionParser = P.lazy((): mixed => {
  const ListParser = require('./collections/list').default.map(packList)
  const SimpleProjectionParser = P.seq(P.string('?').atMost(1), ListParser).map(
    ([optional, value]: [
      [] | [mixed],
      ListNodeType
    ]): WrappedProjectionNodeType => ({
      name: 'projection',
      optional: optional.length === 1,
      value: value
    })
  )
 
  return SimpleProjectionParser
})
 
const ProjectionParser = P.lazy((): mixed => {
  const ProjectableParser = require('./projectable').default
 
  return P.seq(
    ProjectableParser.skip(crap),
    P.alt(SimpleProjectionParser, PropertyParser, ObjectProjectionParser)
      .skip(crap)
      .many()
  )
    .map(
      ([left, right]: [
        ProjectableNodeType,
        Array<WrappedProjectionNodeWithOptionalType>
      ]): NodeType => (right.length === 0 ? left : unpack([left, right]))
    )
    .desc('projection')
})
 
export default ProjectionParser