Parser.js

/**
 * Parse attributes from Builder into query string
 */

import qs from 'qs'

export default class Parser {
  constructor(builder) {
    this.builder = builder
    this.uri = ''
  }

  // final query string
  query() {
    this.reset()
    this.includes()
    this.appends()
    this.fields()
    this.filters()
    this.sorts()
    this.page()
    this.limit()
    this.payload()

    return this.uri
  }

  reset() {
    this.uri = ''
  }

  /**
   * Helpers
   */

  hasIncludes() {
    return this.builder.includes.length > 0
  }

  hasAppends() {
    return this.builder.appends.length > 0
  }

  hasFields() {
    return Object.keys(this.builder.fields).length > 0
  }

  hasFilters() {
    return Object.keys(this.builder.filters).length > 0
  }

  hasSorts() {
    return this.builder.sorts.length > 0
  }

  hasPage() {
    return this.builder.pageValue !== null
  }

  hasLimit() {
    return this.builder.limitValue !== null
  }

  hasPayload() {
    return this.builder.payload !== null
  }

  prepend() {
    return this.uri === '' ? '?' : '&'
  }

  parameterNames() {
    return this.builder.model.parameterNames()
  }

  /**
   * Parsers
   */

  includes() {
    if (!this.hasIncludes()) {
      return
    }

    this.uri +=
      this.prepend() +
      this.parameterNames().include +
      '=' +
      this.builder.includes
  }

  appends() {
    if (!this.hasAppends()) {
      return
    }

    this.uri +=
      this.prepend() + this.parameterNames().append + '=' + this.builder.appends
  }

  fields() {
    if (!this.hasFields()) {
      return
    }

    let fields = { [this.parameterNames().fields]: this.builder.fields }
    this.uri +=
      this.prepend() +
      qs.stringify(fields, {
        encode: false,
        ...this.builder.model.stringifyOptions()
      })
  }

  filters() {
    if (!this.hasFilters()) {
      return
    }

    let filters = { [this.parameterNames().filter]: this.builder.filters }
    this.uri +=
      this.prepend() +
      qs.stringify(filters, {
        encode: false,
        ...this.builder.model.stringifyOptions()
      })
  }

  sorts() {
    if (!this.hasSorts()) {
      return
    }

    this.uri +=
      this.prepend() + this.parameterNames().sort + '=' + this.builder.sorts
  }

  page() {
    if (!this.hasPage()) {
      return
    }

    this.uri +=
      this.prepend() + this.parameterNames().page + '=' + this.builder.pageValue
  }

  limit() {
    if (!this.hasLimit()) {
      return
    }

    this.uri +=
      this.prepend() +
      this.parameterNames().limit +
      '=' +
      this.builder.limitValue
  }

  payload() {
    if (!this.hasPayload()) {
      return
    }

    this.uri +=
      this.prepend() +
      qs.stringify(this.builder.payload, {
        encode: false,
        ...this.builder.model.stringifyOptions()
      })
  }
}