partial.lenses - npm Package Compare versions

Comparing version 3.0.0 to 3.1.0

lib/partial.lenses.js

@@ -6,3 +6,3 @@ "use strict";
 });
-exports.props = exports.identity = exports.pick = exports.augment = exports.filter = exports.append = exports.index = exports.findWith = exports.find = exports.prop = exports.normalize = exports.define = exports.required = exports.defaults = exports.replace = exports.choice = exports.orElse = exports.nothing = exports.choose = exports.get = exports.set = exports.modify = exports.lens = exports.removeAll = exports.remove = exports.compose = exports.toRamda = exports.fromRamda = undefined;
+exports.props = exports.identity = exports.pick = exports.augment = exports.filter = exports.append = exports.index = exports.findWith = exports.find = exports.prop = exports.normalize = exports.define = exports.required = exports.defaults = exports.replace = exports.choice = exports.orElse = exports.nothing = exports.choose = exports.just = exports.chain = exports.get = exports.set = exports.modify = exports.lens = exports.removeAll = exports.remove = exports.compose = exports.toRamda = exports.fromRamda = undefined;
 
@@ -136,2 +136,12 @@ var _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; };
 
+var chain = exports.chain = R.curry(function (x2yL, xL) {
+  return compose(xL, choose(function (xO) {
+    return xO === undefined ? nothing : x2yL(xO);
+  }));
+});
+
+var just = exports.just = function just(x) {
+  return lens(R.always(x), snd);
+};
+
 var choose = exports.choose = function choose(x2yL) {
@@ -306,2 +316,2 @@ return function (toFunctor) {
 exports.default = compose;
-//# 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* as R from \"ramda\"\n\n//\n\nconst id = x => x\nconst snd = (_, c) => c\n\n//\n\nconst check = (expected, predicate) => x => {\n  if (predicate(x))\n    return x\n  else\n    throw new Error(`Expected ${expected}, but got ${x}.`)\n}\n\nconst assert = process.env.NODE_ENV === \"production\" ? () => id : check\n\n//\n\nconst empty = {}\n\nconst deleteKey = (k, o) => {\n  if (o === undefined || !(k in o))\n    return o\n  let r\n  for (const p in o) {\n    if (p !== k) {\n      if (undefined === r)\n        r = {}\n      r[p] = o[p]\n    }\n  }\n  return r\n}\n\nconst setKey = (k, v, o) => {\n  if (o === undefined)\n    return {[k]: v}\n  if (k in o && R.equals(v, o[k]))\n    return o\n  const r = {[k]: v}\n  for (const p in o)\n    if (p !== k)\n      r[p] = o[p]\n  return r\n}\n\n//\n\nconst dropped = xs => Object.keys(xs).length === 0 ? undefined : xs\n\n//\n\nconst toPartial = transform => x => undefined === x ? x : transform(x)\n\n//\n\nconst conserve = (c1, c0) => R.equals(c1, c0) ? c0 : c1\n\nconst toConserve = f => (y, c0) => conserve(f(y, c0), c0)\n\n//\n\nconst seemsLens = x => typeof x === \"function\" && x.length === 1\n\nexport const fromRamda = assert(\"a lens\", seemsLens)\n\nexport const toRamda = l => {\n  if (isProp(l))  return toRamdaProp(l)\n  if (isIndex(l)) return toRamdaIndex(l)\n  return fromRamda(l)\n}\n\nexport const compose = (...ls) =>\n  ls.length === 0 ? identity :\n  ls.length === 1 ? ls[0] :\n  R.compose(...ls.map(toRamda))\n\nexport const remove = R.curry((l, s) => R.set(toRamda(l), undefined, s))\n\nexport const removeAll = R.curry((lens, data) => {\n  while (get(lens, data) !== undefined)\n    data = remove(lens, data)\n  return data\n})\n\nexport const lens = R.lens\nexport const modify = R.curry((l, x2x, s) => R.over(toRamda(l), x2x, s))\nexport const set = R.curry((l, x, s) => R.set(toRamda(l), x, s))\nexport const get = R.curry((l, s) => R.view(toRamda(l), s))\n\nexport const choose = x2yL => toFunctor => target => {\n  const l = toRamda(x2yL(target))\n  return R.map(focus => R.set(l, focus, target), toFunctor(R.view(l, target)))\n}\n\nexport const nothing = lens(snd, snd)\n\nexport const orElse =\n  R.curry((d, l) => choose(x => get(l, x) !== undefined ? l : d))\n\nexport const choice = (...ls) => choose(x => {\n  const i = ls.findIndex(l => get(l, x) !== undefined)\n  return 0 <= i ? ls[i] : nothing\n})\n\nexport const replace = R.curry((inn, out) =>\n  lens(x => R.equals(x, inn) ? out : x,\n       toConserve(y => R.equals(y, out) ? inn : y)))\n\nexport const defaults = replace(undefined)\nexport const required = inn => replace(inn, undefined)\nexport const define = v => R.compose(required(v), defaults(v))\n\nexport const normalize = transform =>\n  lens(toPartial(transform), toConserve(toPartial(transform)))\n\nconst isProp = x => typeof x === \"string\"\n\nexport const prop = assert(\"a string\", isProp)\n\nconst toRamdaProp = k =>\n  lens(o => o && o[k],\n       (v, o) => v === undefined ? deleteKey(k, o) : setKey(k, v, o))\n\nexport const find = predicate => choose(xs => {\n  if (xs === undefined)\n    return append\n  const i = xs.findIndex(predicate)\n  return i < 0 ? append : i\n})\n\nexport const findWith = (...ls) => {\n  const lls = toRamda(compose(...ls))\n  return compose(find(x => R.view(lls, x) !== undefined), lls)\n}\n\nconst isIndex = x => Number.isInteger(x) && 0 <= x\n\nexport const index = assert(\"a non-negative integer\", isIndex)\n\nconst toRamdaIndex = i => lens(xs => xs && xs[i], (x, xs) => {\n  if (x === undefined) {\n    if (xs === undefined)\n      return undefined\n    if (i < xs.length)\n      return dropped(xs.slice(0, i).concat(xs.slice(i+1)))\n    return xs\n  } else {\n    if (xs === undefined)\n      return Array(i).concat([x])\n    if (xs.length <= i)\n      return xs.concat(Array(i - xs.length), [x])\n    if (R.equals(x, xs[i]))\n      return xs\n    return xs.slice(0, i).concat([x], xs.slice(i+1))\n  }\n})\n\nexport const append = lens(snd, (x, xs) =>\n  x === undefined ? xs : xs === undefined ? [x] : xs.concat([x]))\n\nexport const filter = p => lens(xs => xs && xs.filter(p), (ys, xs) =>\n  conserve(dropped(R.concat(ys || [], (xs || []).filter(R.complement(p)))), xs))\n\nexport const augment = template => lens(\n  toPartial(x => {\n    const z = {...x}\n    for (const k in template)\n      z[k] = template[k](x)\n    return z\n  }),\n  toConserve((y, c) => {\n    if (y === undefined)\n      return undefined\n    let z\n    const set = (k, v) => {\n      if (undefined === z)\n        z = {}\n      z[k] = v\n    }\n    for (const k in y) {\n      if (!(k in template))\n        set(k, y[k])\n      else\n        if (k in c)\n          set(k, c[k])\n    }\n    return z\n  }))\n\nexport const pick = template => lens(\n  c => {\n    let r\n    for (const k in template) {\n      const v = get(template[k], c)\n      if (v !== undefined) {\n        if (r === undefined)\n          r = {}\n        r[k] = v\n      }\n    }\n    return r\n  },\n  (o = empty, cIn) => {\n    let c = cIn\n    for (const k in template)\n      c = set(template[k], o[k], c)\n    return c\n  })\n\nexport const identity = lens(id, conserve)\n\nexport const props = (...ks) => pick(R.zipObj(ks, ks))\n\nexport default compose\n"]}
+//# 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* as R from \"ramda\"\n\n//\n\nconst id = x => x\nconst snd = (_, c) => c\n\n//\n\nconst check = (expected, predicate) => x => {\n  if (predicate(x))\n    return x\n  else\n    throw new Error(`Expected ${expected}, but got ${x}.`)\n}\n\nconst assert = process.env.NODE_ENV === \"production\" ? () => id : check\n\n//\n\nconst empty = {}\n\nconst deleteKey = (k, o) => {\n  if (o === undefined || !(k in o))\n    return o\n  let r\n  for (const p in o) {\n    if (p !== k) {\n      if (undefined === r)\n        r = {}\n      r[p] = o[p]\n    }\n  }\n  return r\n}\n\nconst setKey = (k, v, o) => {\n  if (o === undefined)\n    return {[k]: v}\n  if (k in o && R.equals(v, o[k]))\n    return o\n  const r = {[k]: v}\n  for (const p in o)\n    if (p !== k)\n      r[p] = o[p]\n  return r\n}\n\n//\n\nconst dropped = xs => Object.keys(xs).length === 0 ? undefined : xs\n\n//\n\nconst toPartial = transform => x => undefined === x ? x : transform(x)\n\n//\n\nconst conserve = (c1, c0) => R.equals(c1, c0) ? c0 : c1\n\nconst toConserve = f => (y, c0) => conserve(f(y, c0), c0)\n\n//\n\nconst seemsLens = x => typeof x === \"function\" && x.length === 1\n\nexport const fromRamda = assert(\"a lens\", seemsLens)\n\nexport const toRamda = l => {\n  if (isProp(l))  return toRamdaProp(l)\n  if (isIndex(l)) return toRamdaIndex(l)\n  return fromRamda(l)\n}\n\nexport const compose = (...ls) =>\n  ls.length === 0 ? identity :\n  ls.length === 1 ? ls[0] :\n  R.compose(...ls.map(toRamda))\n\nexport const remove = R.curry((l, s) => R.set(toRamda(l), undefined, s))\n\nexport const removeAll = R.curry((lens, data) => {\n  while (get(lens, data) !== undefined)\n    data = remove(lens, data)\n  return data\n})\n\nexport const lens = R.lens\nexport const modify = R.curry((l, x2x, s) => R.over(toRamda(l), x2x, s))\nexport const set = R.curry((l, x, s) => R.set(toRamda(l), x, s))\nexport const get = R.curry((l, s) => R.view(toRamda(l), s))\n\nexport const chain = R.curry((x2yL, xL) =>\n  compose(xL, choose(xO => xO === undefined ? nothing : x2yL(xO))))\n\nexport const just = x => lens(R.always(x), snd)\n\nexport const choose = x2yL => toFunctor => target => {\n  const l = toRamda(x2yL(target))\n  return R.map(focus => R.set(l, focus, target), toFunctor(R.view(l, target)))\n}\n\nexport const nothing = lens(snd, snd)\n\nexport const orElse =\n  R.curry((d, l) => choose(x => get(l, x) !== undefined ? l : d))\n\nexport const choice = (...ls) => choose(x => {\n  const i = ls.findIndex(l => get(l, x) !== undefined)\n  return 0 <= i ? ls[i] : nothing\n})\n\nexport const replace = R.curry((inn, out) =>\n  lens(x => R.equals(x, inn) ? out : x,\n       toConserve(y => R.equals(y, out) ? inn : y)))\n\nexport const defaults = replace(undefined)\nexport const required = inn => replace(inn, undefined)\nexport const define = v => R.compose(required(v), defaults(v))\n\nexport const normalize = transform =>\n  lens(toPartial(transform), toConserve(toPartial(transform)))\n\nconst isProp = x => typeof x === \"string\"\n\nexport const prop = assert(\"a string\", isProp)\n\nconst toRamdaProp = k =>\n  lens(o => o && o[k],\n       (v, o) => v === undefined ? deleteKey(k, o) : setKey(k, v, o))\n\nexport const find = predicate => choose(xs => {\n  if (xs === undefined)\n    return append\n  const i = xs.findIndex(predicate)\n  return i < 0 ? append : i\n})\n\nexport const findWith = (...ls) => {\n  const lls = toRamda(compose(...ls))\n  return compose(find(x => R.view(lls, x) !== undefined), lls)\n}\n\nconst isIndex = x => Number.isInteger(x) && 0 <= x\n\nexport const index = assert(\"a non-negative integer\", isIndex)\n\nconst toRamdaIndex = i => lens(xs => xs && xs[i], (x, xs) => {\n  if (x === undefined) {\n    if (xs === undefined)\n      return undefined\n    if (i < xs.length)\n      return dropped(xs.slice(0, i).concat(xs.slice(i+1)))\n    return xs\n  } else {\n    if (xs === undefined)\n      return Array(i).concat([x])\n    if (xs.length <= i)\n      return xs.concat(Array(i - xs.length), [x])\n    if (R.equals(x, xs[i]))\n      return xs\n    return xs.slice(0, i).concat([x], xs.slice(i+1))\n  }\n})\n\nexport const append = lens(snd, (x, xs) =>\n  x === undefined ? xs : xs === undefined ? [x] : xs.concat([x]))\n\nexport const filter = p => lens(xs => xs && xs.filter(p), (ys, xs) =>\n  conserve(dropped(R.concat(ys || [], (xs || []).filter(R.complement(p)))), xs))\n\nexport const augment = template => lens(\n  toPartial(x => {\n    const z = {...x}\n    for (const k in template)\n      z[k] = template[k](x)\n    return z\n  }),\n  toConserve((y, c) => {\n    if (y === undefined)\n      return undefined\n    let z\n    const set = (k, v) => {\n      if (undefined === z)\n        z = {}\n      z[k] = v\n    }\n    for (const k in y) {\n      if (!(k in template))\n        set(k, y[k])\n      else\n        if (k in c)\n          set(k, c[k])\n    }\n    return z\n  }))\n\nexport const pick = template => lens(\n  c => {\n    let r\n    for (const k in template) {\n      const v = get(template[k], c)\n      if (v !== undefined) {\n        if (r === undefined)\n          r = {}\n        r[k] = v\n      }\n    }\n    return r\n  },\n  (o = empty, cIn) => {\n    let c = cIn\n    for (const k in template)\n      c = set(template[k], o[k], c)\n    return c\n  })\n\nexport const identity = lens(id, conserve)\n\nexport const props = (...ks) => pick(R.zipObj(ks, ks))\n\nexport default compose\n"]}

package.json

 {
   "name": "partial.lenses",
-  "version": "3.0.0",
+  "version": "3.1.0",
   "description": "Partial lenses",
@@ -5,0 +5,0 @@ "main": "lib/partial.lenses.js",

README.md

@@ -416,6 +416,6 @@ [ [Tutorial](#tutorial) | [Reference](#reference) | [Background](#background) ]
 
-`L.append` is a special lens that operates on arrays.  The view of `L.append` is
-always undefined.  Setting `L.append` to undefined has no effect by itself.
-Setting `L.append` to a defined value appends the value to the end of the
-focused array.
+`L.append` is a special semi-degenerate lens that operates on arrays.  The view
+of `L.append` is always undefined.  Setting `L.append` to undefined has no
+effect by itself.  Setting `L.append` to a defined value appends the value to
+the end of the focused array.
 
@@ -444,2 +444,18 @@ For example:
 
+#### [`L.chain(a2bPLens, aPLens)`](#lchaina2bplens-aplens "L.chain :: (a -> PLens s b) -> PLens s a -> PLens s b")
+
+`L.chain(a2bPLens, aPLens)` is equivalent to
+
+```js
+L.compose(aPLens, L.choose(aMaybe =>
+  aMaybe === undefined
+  ? L.nothing
+  : a2bPLens(aMaybe)))
+```
+
+With the `just`, `chain`, `choice` and `nothing` combinators, one can view
+partial lenses as subsuming the maybe monad.  Of course, the whole point of
+lenses is that they are bidirectional and the special lenses `just` and
+`nothing` are essentially degenerate.
+
 #### [`L.choose(maybeValue => PLens)`](#lchoosemaybevalue--plens "L.choose :: (Maybe s -> PLens s a) -> PLens s a")
@@ -450,4 +466,3 @@
 lens.  In other words, the `L.choose` combinator allows a lens to be constructed
-*after* examining the data structure being manipulated.  The lens returned by
-the function given to `L.choose` will be lifted.
+*after* examining the data structure being manipulated.
 
@@ -475,4 +490,4 @@ For example, given:
 `L.choice(...ls)` returns a partial lens that acts like the first of the given
-lenses, `...ls`, whose view is not undefined on the given target.  When the
-views of all of the given lenses are undefined, the returned lens acts like
+lenses, `ls`, whose view is not undefined on the given target.  When the views
+of all of the given lenses are undefined, the returned lens acts like
 `L.nothing`, which is the identity element of `L.choice`.
@@ -620,2 +635,15 @@
 
+#### [`L.just(value)`](#ljustvalue "L.just :: a -> PLens s a")
+
+`L.just(x)` is equivalent to `L.compose(L.nothing, L.defaults(x))` and is a
+special degenerate lens whose view is always `x` and writing through the lens
+has no effect.  In other words, for all `x`, `y` and `z`:
+
+```js
+   L.get(L.just(z), x) = z
+L.set(L.just(z), y, x) = x
+```
+
+`L.just` can be seen as the unit function of the monad formed with `L.chain`.
+
 #### [`L.lens(get, set)`](#llensget-set "L.lens :: (Maybe s -> Maybe a) -> (Maybe a -> Maybe s -> Maybe s) -> PLens s a")
@@ -675,4 +703,4 @@
 
-`L.nothing` is a special lens whose view is always undefined and setting through
-`L.nothing` has no effect.  In other words, for all `x` and `y`:
+`L.nothing` is a special degenerate lens whose view is always undefined and
+setting through `L.nothing` has no effect.  In other words, for all `x` and `y`:
 
@@ -679,0 +707,0 @@ ```js

src/partial.lenses.js

@@ -93,2 +93,7 @@ import * as R from "ramda"
 
+export const chain = R.curry((x2yL, xL) =>
+  compose(xL, choose(xO => xO === undefined ? nothing : x2yL(xO))))
+
+export const just = x => lens(R.always(x), snd)
+
 export const choose = x2yL => toFunctor => target => {
@@ -95,0 +100,0 @@ const l = toRamda(x2yL(target))

test/tests.js

@@ -154,2 +154,14 @@ import * as R from "ramda"
 
+describe("L.just", () => {
+  testEq('L.get(L.just("always"), "anything")', "always")
+  testEq('L.set(L.just("always"), "anything", "original")', "original")
+})
+
+describe("L.chain", () => {
+  testEq('L.get(L.chain(elems => elems instanceof Array ? 0 : L.identity, "elems"), {elems: ["x"]})', "x")
+  testEq('L.set(L.chain(elems => elems instanceof Array ? 0 : L.identity, "elems"), "y", {elems: ["x"]})', {elems: ["y"]})
+  testEq('L.get(L.chain(elems => elems instanceof Array ? 0 : L.identity, "elems"), {notit: true})', undefined)
+  testEq('L.set(L.chain(elems => elems instanceof Array ? 0 : L.identity, "elems"), false, {notit: true})', {notit: true})
+})
+
 describe("L.orElse", () => {
@@ -156,0 +168,0 @@ testEq('L.get(L.orElse("b", "a"), {a: 2, b: 1})', 2)

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