chain-able
Version:
interfaces that describe their intentions.
325 lines (300 loc) • 29.3 kB
JavaScript
/* eslint complexity: "OFF" */
var MethodChain = require('./MethodChain')
var ChainedMapBase = require('./ChainedMapBase')
var dopemerge = require('./deps/dopemerge')
var isFunction = require('./deps/is/function')
var isUndefined = require('./deps/is/undefined')
var isTrue = require('./deps/is/true')
var isMapish = require('./deps/is/mapish')
var ObjectKeys = require('./deps/util/keys')
var SHORTHANDS_KEY = require('./deps/meta/shorthands')
var ENV_DEVELOPMENT = require('./deps/env/dev')
var ENV_DEBUG = require('./deps/env/debug')
var ON_EXISTING_KEY = 'onExisting'
var ON_VALUE_KEY = 'onValue'
var MERGER_KEY = 'merger'
var MERGER_OPTIONS_KEY = 'opts'
var OBJ_KEY = 'obj'
/**
* @since 1.0.0
* @type {Map}
* @extends {ChainedMapBase}
* @member MergeChain
* @memberOf Chainable
*
* @types MergeChain
* @tests MergeChain
* @see deps/dopemerge
*
* {@link https://sourcemaking.com/design_patterns/visitor visitor-pattern}
*
* @TODO consider just making this a function,
* because 80/20 onValue merger & onExisting
* are rarely used & are easily overridable with .merge
*/
var MergeChain = (function (ChainedMapBase) {
function MergeChain(parent) {
ChainedMapBase.call(this, parent)
/* prettier-ignore */
this
.extend([ON_EXISTING_KEY, ON_VALUE_KEY, OBJ_KEY])
.set(ON_VALUE_KEY, function () { return true; })
.set(MERGER_KEY, dopemerge)
}
if ( ChainedMapBase ) MergeChain.__proto__ = ChainedMapBase;
MergeChain.prototype = Object.create( ChainedMapBase && ChainedMapBase.prototype );
MergeChain.prototype.constructor = MergeChain;
/**
* @desc options for merging with dopemerge
* @modifies this.merger | this.opts
*
* @memberOf MergeChain
* @since 1.0.2
* @param {Object | Function} opts when object: options for the merger. when function: is the merger
* @return {MergeChain} @chainable
* @see dopemerge
*
* @example
* {
* stringToArray: true,
* boolToArray: false,
* boolAsRight: true,
* ignoreTypes: ['null', 'undefined', 'NaN'],
* debug: false,
* }
*
* @example
* .merger(require('lodash.mergewith')())
*/
MergeChain.init = function init (parent) {
return new MergeChain(parent)
};
MergeChain.prototype.merger = function merger (opts) {
if (isFunction(opts)) { return this.set(MERGER_KEY, opts) }
return this.set(MERGER_OPTIONS_KEY, opts)
};
// [v] messes comments on conditional brace style
/* prettier-ignore */
/**
* @desc merges object in, goes through all keys, checks cbs, dopemerges
*
* @since 1.0.0
*
* @param {Object} [obj2=undefined] object to merge in, defaults to this.get('obj')
* @return {MergeChain} @chainable
*
* @see ChainedMap
* @TODO issue here if we extend without shorthands &
* we want to merge existing values... :s
*
*
* @example
*
* const chain = new Chain()
* chain.merge({canada: {eh: true}})
* chain.merge({canada: {arr: [0, {'1': 2}], eh: {again: true}}})
* chain.entries()
* //=> {canada:{ eh: {again: true}, arr: [0, {'1': 2}] }}
*/
MergeChain.prototype.merge = function merge (obj2) {
var this$1 = this;
// better uglifying
var parent = this.parent
var get = function (key) { return this$1.get(key); }
var onExisting = get(ON_EXISTING_KEY)
var onValue = get(ON_VALUE_KEY)
var opts = get(MERGER_OPTIONS_KEY)
var obj = obj2 || get(OBJ_KEY)
var merger = get(MERGER_KEY)
var shorthands = parent.meta ? parent.meta(SHORTHANDS_KEY) : {}
var keys = ObjectKeys(obj)
// @@debugger
/* istanbul ignore next: devs */
if (ENV_DEVELOPMENT) {
if (!obj) {
console.log({onExisting: onExisting, opts: opts, obj: obj, merger: merger, shorthands: shorthands, keys: keys, parent: parent})
throw new Error('must provide an object to merge')
}
}
/**
* @private
*
* since this would be slower
* if I want to not have a speedy default when using .onExisting
* should @note to use .extend
* when using chains without a class & doing .merge (edge-case)
*
* @param {Primitive} key key (shorthands[key] or just key)
* @param {*} value obj[key]
* @return {void}
*
* @TODO could use .eq here
* @TODO if (isMapish(obj)) obj = obj.entries()
*
* @example
* var obj = {key: 1}
*
* MergeChain.init(obj).merge({key: ['value']})
*
* // goes to this internal scoped function
* handleExisting('key', ['value'])
* // if there is .onValue or .onExisting, use them, default deepmerge
*
* obj
* //=> {key: [1, 'value']}
*
*/
var handleExisting = function (key, value) {
/**
* @desc when fn is a full method, not an extended shorthand
* @since 0.5.0
*
* @param {Primitive} keyToSet key we chose to set
* @param {*} valueToSet value we chose to set (merged, existing, new)
* @return {Parent | Chain | *} .set or [keyToSet] return
*
* @example
*
* MergeChain.init(new Chain().extend(['eh']))
*
* //isFunction: true => call parent[keyToSet](valueToSet)
* setChosen('eh', 1)
* //=> parent
* parent.get('eh')
* //=> 1
*
* //=>isFunction: false => parent.set(keyToSet, valueToSet)
* setChosen('oh', 1)
* //=> parent //<- unless .set is overriden
* parent.get('oh')
* //=> 1
*/
var setChosen = function (keyToSet, valueToSet) { return (isFunction(parent[key])
? parent[keyToSet](valueToSet)
: parent.set(keyToSet, valueToSet)); }
/**
* check if it's shorthanded
* -> check if it has a value already
*/
if (isTrue(parent.has(key))) {
// get that value
var existing = parent.get(key)
/**
* if we have onExisting, call it
* else default to dopemerge
*/
if (isUndefined(onExisting)) {
/* istanbul ignore next: devs */
if (ENV_DEBUG) {
console.log(
'parent has: no onExisting',
{existing: existing, [key]: value}
)
}
setChosen(key, merger(existing, value, opts))
}
else {
/* istanbul ignore next: devs */
if (ENV_DEBUG) {
console.log(
'parent has: has onExisting',
{existing: existing, onExisting: onExisting, [key]: value}
)
}
/**
* maybe we should not even have `.onExisting`
* since we can just override merge method...
* and then client can just use a custom merger...
*
* could add and remove subscriber but that's overhead and
* tricky here, because if we set a value that was just set...
*/
setChosen(key, onExisting(existing, value, opts))
}
}
else {
/* istanbul ignore next: devs */
if (ENV_DEBUG) {
console.log('parent does not have', {[key]: value})
}
setChosen(key, value)
}
}
for (var k = 0, len = keys.length; k < len; k++) {
// key to the current property in the data being merged
var key = keys[k]
// we have our value, no we can change the key if needed for shorthands
var value = obj[key]
// @NOTE: when shorthands is an object, key is the method it should call
if (!isUndefined(shorthands[key]) && shorthands[key] !== key) {
/* istanbul ignore next: devs */
if (ENV_DEBUG) {
console.log(
'had a shorthand with a diff key than the object (likely @alias)',
{shorthandMethod: shorthands[key], key: key, value: value}
)
}
key = shorthands[key]
}
// method for the key
var method = parent[key]
/* istanbul ignore next: sourcemaps trigger istanbul here incorrectly */
// use onValue when set
if (!onValue(value, key, this$1)) {
/* istanbul ignore next: devs */
if (ENV_DEBUG) {
console.log('had onValue, was false, ignored', {onValue: onValue, key: key, value: value})
}
continue
}
// when property itself is a Chainable
else if (isMapish(method)) {
/* istanbul ignore next: devs */
if (ENV_DEBUG) {
console.log('has method or shorthand')
}
parent[key].merge(value)
}
// we have a method or shorthand
else if (method) {
/* istanbul ignore next: devs */
if (ENV_DEBUG) {
console.log('has method or shorthand', {method: method, key: key, value: value})
}
handleExisting(key, value)
}
// default to .set on the store
else {
/* istanbul ignore next: devs */
if (ENV_DEBUG) {
console.log('went to default', {method: method, key: key, value: value})
}
parent.set(key, value)
}
}
return parent
};
return MergeChain;
}(ChainedMapBase));
/**
* @memberOf MergeChain
* @method onExisting
* @since 0.9.0
* @example
* const {Chain, MergeChain} = require('chain-able')
*
* const chain = new Chain().set('str', 'stringy')
*
* MergeChain.init(chain)
* .onExisting((a, b) => a + b)
* .merge({str: '+'})
*
* chain.get('str')
* //=> 'stringy+'
*/
module.exports = MergeChain
// @TODO re-enable this later
// module.exports = new MethodChain(MergeChain.prototype)
// .methods(['onExisting', 'onValue', 'obj'])
// .build(MergeChain)
//# sourceMappingURL=data:application/json;charset=utf-8;base64,{"version":3,"file":"MergeChain.js","sources":["MergeChain.js"],"sourcesContent":["/* eslint complexity: \"OFF\" */\nconst MethodChain = require('./MethodChain')\nconst ChainedMapBase = require('./ChainedMapBase')\nconst dopemerge = require('./deps/dopemerge')\nconst isFunction = require('./deps/is/function')\nconst isUndefined = require('./deps/is/undefined')\nconst isTrue = require('./deps/is/true')\nconst isMapish = require('./deps/is/mapish')\nconst ObjectKeys = require('./deps/util/keys')\nconst SHORTHANDS_KEY = require('./deps/meta/shorthands')\nconst ENV_DEVELOPMENT = require('./deps/env/dev')\nconst ENV_DEBUG = require('./deps/env/debug')\n\nconst ON_EXISTING_KEY = 'onExisting'\nconst ON_VALUE_KEY = 'onValue'\nconst MERGER_KEY = 'merger'\nconst MERGER_OPTIONS_KEY = 'opts'\nconst OBJ_KEY = 'obj'\n\n/**\n * @since 1.0.0\n * @type {Map}\n * @extends {ChainedMapBase}\n * @member MergeChain\n * @memberOf Chainable\n *\n * @types MergeChain\n * @tests MergeChain\n * @see deps/dopemerge\n *\n * {@link https://sourcemaking.com/design_patterns/visitor visitor-pattern}\n *\n * @TODO consider just making this a function,\n *       because 80/20 onValue merger & onExisting\n *       are rarely used & are easily overridable with .merge\n */\nclass MergeChain extends ChainedMapBase {\n  /**\n   * @static\n   * @param  {Chainable | ParentType} parent ParentType required, for merging\n   * @return {MergeChain} @chainable\n   *\n   * @example\n   *\n   *    let map = new Map()\n   *    map.set('eh', 1)\n   *    map.set('coo', 'oo')\n   *\n   *    MergeChain.init(map).merge({eh: 2})\n   *    console.dir(map)\n   *    //=> Map { 'eh' => 2, 'coo' => 'oo' }\n   *\n   */\n  static init(parent) {\n    return new MergeChain(parent)\n  }\n\n  /**\n   * @inheritdoc\n   */\n  constructor(parent) {\n    super(parent)\n\n    /* prettier-ignore */\n    this\n      .extend([ON_EXISTING_KEY, ON_VALUE_KEY, OBJ_KEY])\n      .set(ON_VALUE_KEY, () => true)\n      .set(MERGER_KEY, dopemerge)\n  }\n\n  /**\n   * @desc options for merging with dopemerge\n   *       @modifies this.merger | this.opts\n   *\n   * @memberOf MergeChain\n   * @since 1.0.2\n   * @param  {Object | Function} opts when object: options for the merger. when function: is the merger\n   * @return {MergeChain} @chainable\n   * @see dopemerge\n   *\n   * @example\n   *   {\n   *     stringToArray: true,\n   *     boolToArray: false,\n   *     boolAsRight: true,\n   *     ignoreTypes: ['null', 'undefined', 'NaN'],\n   *     debug: false,\n   *   }\n   *\n   * @example\n   *    .merger(require('lodash.mergewith')())\n   */\n  merger(opts) {\n    if (isFunction(opts)) return this.set(MERGER_KEY, opts)\n    return this.set(MERGER_OPTIONS_KEY, opts)\n  }\n\n  // [v] messes comments on conditional brace style\n  /* prettier-ignore */\n  /**\n   * @desc merges object in, goes through all keys, checks cbs, dopemerges\n   *\n   * @since 1.0.0\n   *\n   * @param  {Object} [obj2=undefined] object to merge in, defaults to this.get('obj')\n   * @return {MergeChain} @chainable\n   *\n   * @see ChainedMap\n   * @TODO issue here if we extend without shorthands &\n   *       we want to merge existing values... :s\n   *\n   *\n   * @example\n   *\n   *  const chain = new Chain()\n   *  chain.merge({canada: {eh: true}})\n   *  chain.merge({canada: {arr: [0, {'1': 2}], eh: {again: true}}})\n   *  chain.entries()\n   *  //=> {canada:{ eh: {again: true}, arr: [0, {'1': 2}] }}\n   */\n  merge(obj2) {\n    // better uglifying\n    const parent = this.parent\n    const get = key => this.get(key)\n\n    const onExisting = get(ON_EXISTING_KEY)\n    const onValue = get(ON_VALUE_KEY)\n    const opts = get(MERGER_OPTIONS_KEY)\n    const obj = obj2 || get(OBJ_KEY)\n    const merger = get(MERGER_KEY)\n    const shorthands = parent.meta ? parent.meta(SHORTHANDS_KEY) : {}\n    const keys = ObjectKeys(obj)\n\n    // @@debugger\n\n    /* istanbul ignore next: devs */\n    if (ENV_DEVELOPMENT) {\n      if (!obj) {\n        console.log({onExisting, opts, obj, merger, shorthands, keys, parent})\n        throw new Error('must provide an object to merge')\n      }\n    }\n\n    /**\n     * @private\n     *\n     * since this would be slower\n     * if I want to not have a speedy default when using .onExisting\n     * should @note to use .extend\n     * when using chains without a class & doing .merge (edge-case)\n     *\n     * @param  {Primitive} key key (shorthands[key] or just key)\n     * @param  {*} value obj[key]\n     * @return {void}\n     *\n     * @TODO could use .eq here\n     * @TODO if (isMapish(obj)) obj = obj.entries()\n     *\n     * @example\n     *  var obj = {key: 1}\n     *\n     *  MergeChain.init(obj).merge({key: ['value']})\n     *\n     *  // goes to this internal scoped function\n     *  handleExisting('key', ['value'])\n     *  // if there is .onValue or .onExisting, use them, default deepmerge\n     *\n     *  obj\n     *  //=> {key: [1, 'value']}\n     *\n     */\n    const handleExisting = (key, value) => {\n      /**\n       * @desc when fn is a full method, not an extended shorthand\n       * @since 0.5.0\n       *\n       * @param {Primitive} keyToSet key we chose to set\n       * @param {*} valueToSet value we chose to set (merged, existing, new)\n       * @return {Parent | Chain | *} .set or [keyToSet] return\n       *\n       * @example\n       *\n       *    MergeChain.init(new Chain().extend(['eh']))\n       *\n       *    //isFunction: true => call parent[keyToSet](valueToSet)\n       *    setChosen('eh', 1)\n       *    //=> parent\n       *    parent.get('eh')\n       *    //=> 1\n       *\n       *    //=>isFunction: false => parent.set(keyToSet, valueToSet)\n       *    setChosen('oh', 1)\n       *    //=> parent //<- unless .set is overriden\n       *    parent.get('oh')\n       *    //=> 1\n       */\n      const setChosen = (keyToSet, valueToSet) =>\n        (isFunction(parent[key])\n          ? parent[keyToSet](valueToSet)\n          : parent.set(keyToSet, valueToSet))\n\n      /**\n       * check if it's shorthanded\n       * -> check if it has a value already\n       */\n      if (isTrue(parent.has(key))) {\n        // get that value\n        const existing = parent.get(key)\n\n        /**\n         * if we have onExisting, call it\n         * else default to dopemerge\n         */\n        if (isUndefined(onExisting)) {\n          /* istanbul ignore next: devs */\n          if (ENV_DEBUG) {\n            console.log(\n              'parent has: no onExisting',\n              {existing, [key]: value}\n            )\n          }\n          setChosen(key, merger(existing, value, opts))\n        }\n        else {\n          /* istanbul ignore next: devs */\n          if (ENV_DEBUG) {\n            console.log(\n              'parent has: has onExisting',\n              {existing, onExisting, [key]: value}\n            )\n          }\n          /**\n           * maybe we should not even have `.onExisting`\n           * since we can just override merge method...\n           * and then client can just use a custom merger...\n           *\n           * could add and remove subscriber but that's overhead and\n           * tricky here, because if we set a value that was just set...\n           */\n          setChosen(key, onExisting(existing, value, opts))\n        }\n      }\n      else {\n        /* istanbul ignore next: devs */\n        if (ENV_DEBUG) {\n          console.log('parent does not have', {[key]: value})\n        }\n        setChosen(key, value)\n      }\n    }\n\n    for (let k = 0, len = keys.length; k < len; k++) {\n      // key to the current property in the data being merged\n      let key = keys[k]\n\n      // we have our value, no we can change the key if needed for shorthands\n      const value = obj[key]\n\n      // @NOTE: when shorthands is an object, key is the method it should call\n      if (!isUndefined(shorthands[key]) && shorthands[key] !== key) {\n        /* istanbul ignore next: devs */\n        if (ENV_DEBUG) {\n          console.log(\n            'had a shorthand with a diff key than the object (likely @alias)',\n            {shorthandMethod: shorthands[key], key, value}\n          )\n        }\n        key = shorthands[key]\n      }\n\n      // method for the key\n      const method = parent[key]\n\n      /* istanbul ignore next: sourcemaps trigger istanbul here incorrectly */\n      // use onValue when set\n      if (!onValue(value, key, this)) {\n        /* istanbul ignore next: devs */\n        if (ENV_DEBUG) {\n          console.log('had onValue, was false, ignored', {onValue, key, value})\n        }\n        continue\n      }\n      // when property itself is a Chainable\n      else if (isMapish(method)) {\n        /* istanbul ignore next: devs */\n        if (ENV_DEBUG) {\n          console.log('has method or shorthand')\n        }\n        parent[key].merge(value)\n      }\n      // we have a method or shorthand\n      else if (method) {\n        /* istanbul ignore next: devs */\n        if (ENV_DEBUG) {\n          console.log('has method or shorthand', {method, key, value})\n        }\n        handleExisting(key, value)\n      }\n      // default to .set on the store\n      else {\n        /* istanbul ignore next: devs */\n        if (ENV_DEBUG) {\n          console.log('went to default', {method, key, value})\n        }\n        parent.set(key, value)\n      }\n    }\n\n    return parent\n  }\n}\n\n/**\n * @memberOf MergeChain\n * @method onExisting\n * @since 0.9.0\n * @example\n *    const {Chain, MergeChain} = require('chain-able')\n *\n *    const chain = new Chain().set('str', 'stringy')\n *\n *    MergeChain.init(chain)\n *      .onExisting((a, b) => a + b)\n *      .merge({str: '+'})\n *\n *    chain.get('str')\n *    //=> 'stringy+'\n */\n\nmodule.exports = MergeChain\n\n// @TODO re-enable this later\n// module.exports = new MethodChain(MergeChain.prototype)\n//   .methods(['onExisting', 'onValue', 'obj'])\n//   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