X-Git-Url: https://git.ladys.computer/Pisces/blobdiff_plain/8c8953d378b20e194535e22214750367961b6963..refs/heads/current:/collection.js

diff --git a/collection.js b/collection.js
index 6920661..d340709 100644
--- a/collection.js
+++ b/collection.js
@@ -1,67 +1,221 @@
 // ♓🌟 Piscēs ∷ collection.js
 // ====================================================================
 //
-// Copyright © 2020–2022 Lady [@ Lady’s Computer].
+// Copyright © 2020–2023 Lady [@ Lady’s Computer].
 //
 // This Source Code Form is subject to the terms of the Mozilla Public
 // License, v. 2.0. If a copy of the MPL was not distributed with this
 // file, You can obtain one at <https://mozilla.org/MPL/2.0/>.
 
-import { MAX_SAFE_INTEGER } from "./numeric.js";
-import { isObject } from "./object.js";
+import { call, createCallableFunction } from "./function.js";
+import { isConcatSpreadableObject } from "./object.js";
+import { toIndex, type } from "./value.js";
+
+const { prototype: arrayPrototype } = Array;
+
+export const {
+  /** Returns an array of the provided values. */
+  of: array,
+
+  /** Returns whether the provided value is an array. */
+  isArray,
+
+  /** Returns an array created from the provided arraylike. */
+  from: toArray,
+} = Array;
+
+/**
+ * Returns the result of catenating the provided arraylikes into a new
+ * collection according to the algorithm of `Array::concat`.
+ */
+export const catenate = createCallableFunction(
+  arrayPrototype.concat,
+  "catenate",
+);
+
+/**
+ * Copies the items in the provided object to a new location according
+ * to the algorithm of `Array::copyWithin`.
+ */
+export const copyWithin = createCallableFunction(
+  arrayPrototype.copyWithin,
+);
+
+/**
+ * Fills the provided object with the provided value according to the
+ * algorithm of `Array::fill`.
+ */
+export const fill = createCallableFunction(arrayPrototype.fill);
 
 /**
- * Returns -0 if the provided argument is "-0"; returns a number
- * representing the index if the provided argument is a canonical
- * numeric index string; otherwise, returns undefined.
+ * Returns the result of filtering the provided object with the
+ * provided callback, according to the algorithm of `Array::filter`.
+ */
+export const filter = createCallableFunction(arrayPrototype.filter);
+
+/**
+ * Returns the first index in the provided object whose value satisfies
+ * the provided callback according to the algorithm of
+ * `Array::findIndex`.
+ */
+export const findIndex = createCallableFunction(
+  arrayPrototype.findIndex,
+);
+
+/**
+ * Returns the first indexed entry in the provided object whose value
+ * satisfies the provided callback.
  *
- * There is no clamping of the numeric index, but note that numbers
- * above 2^53 − 1 are not safe nor valid integer indices.
- */
-export const canonicalNumericIndexString = ($) => {
-  if (typeof $ != "string") {
-    return undefined;
-  } else if ($ === "-0") {
-    return -0;
-  } else {
-    const n = +$;
-    return $ === `${n}` ? n : undefined;
-  }
+ * If a third argument is supplied, it will be used as the this value
+ * of the callback.
+ */
+export const findIndexedEntry = (
+  $,
+  callback,
+  thisArg = undefined,
+) => {
+  let result = undefined;
+  findItem($, (kValue, k, O) => {
+    if (call(callback, thisArg, [kValue, k, O])) {
+      // The callback succeeded.
+      result = [k, kValue];
+      return true;
+    } else {
+      // The callback failed.
+      return false;
+    }
+  });
+  return result;
 };
 
-/** Returns whether the provided value is an array index. */
-export const isArrayIndex = ($) => {
-  const value = canonicalNumericIndexString($);
-  if (value !== undefined) {
-    return Object.is(value, 0) || value > 0 && value < -1 >>> 0;
-  } else {
-    return false;
-  }
-};
+/**
+ * Returns the first indexed value in the provided object which
+ * satisfies the provided callback, according to the algorithm of
+ * `Array::find`.
+ */
+export const findItem = createCallableFunction(
+  arrayPrototype.find,
+  "findItem",
+);
+
+/**
+ * Returns the result of flatmapping the provided value with the
+ * provided callback according to the algorithm of `Array::flatMap`.
+ */
+export const flatmap = createCallableFunction(
+  arrayPrototype.flatMap,
+  "flatmap",
+);
+
+/**
+ * Returns the result of flattening the provided object according to
+ * the algorithm of `Array::flat`.
+ */
+export const flatten = createCallableFunction(
+  arrayPrototype.flat,
+  "flatten",
+);
+
+/**
+ * Returns the first index of the provided object with a value
+ * equivalent to the provided value according to the algorithm of
+ * `Array::indexOf`.
+ */
+export const getFirstIndex = createCallableFunction(
+  arrayPrototype.indexOf,
+  "getFirstIndex",
+);
+
+/**
+ * Returns the item on the provided object at the provided index
+ * according to the algorithm of `Array::at`.
+ */
+export const getItem = createCallableFunction(
+  arrayPrototype.at,
+  "getItem",
+);
+
+/**
+ * Returns the last index of the provided object with a value
+ * equivalent to the provided value according to the algorithm of
+ * `Array::lastIndexOf`.
+ */
+export const getLastIndex = createCallableFunction(
+  arrayPrototype.lastIndexOf,
+  "getLastIndex",
+);
+
+/**
+ * Returns whether every indexed value in the provided object satisfies
+ * the provided function, according to the algorithm of `Array::every`.
+ */
+export const hasEvery = createCallableFunction(
+  arrayPrototype.every,
+  "hasEvery",
+);
+
+/**
+ * Returns whether the provided object has an indexed value which
+ * satisfies the provided function, according to the algorithm of
+ * `Array::some`.
+ */
+export const hasSome = createCallableFunction(
+  arrayPrototype.some,
+  "hasSome",
+);
+
+/**
+ * Returns whether the provided object has an indexed value equivalent
+ * to the provided value according to the algorithm of
+ * `Array::includes`.
+ *
+ * ※ This algorithm treats missing values as `undefined` rather than
+ * skipping them.
+ */
+export const includes = createCallableFunction(
+  arrayPrototype.includes,
+);
+
+/**
+ * Returns an iterator over the indexed entries in the provided value
+ * according to the algorithm of `Array::entries`.
+ */
+export const indexedEntries = createCallableFunction(
+  arrayPrototype.entries,
+  "indexedEntries",
+);
+
+/**
+ * Returns an iterator over the indices in the provided value according
+ * to the algorithm of `Array::keys`.
+ */
+export const indices = createCallableFunction(
+  arrayPrototype.keys,
+  "indices",
+);
 
 /**
  * Returns whether the provided object is a collection.
  *
  * The definition of “collection” used by Piscēs is similar to
  * Ecmascript’s definition of an arraylike object, but it differs in
- * a few ways :—
+ * a few ways :—
  *
  * - It requires the provided value to be a proper object.
  *
- * - It requires the `length` property to be an integer corresponding
- *   to an integer index.
+ * - It requires the `length` property to be an integer index.
  *
  * - It requires the object to be concat‐spreadable, meaning it must
- *   either be an array or have `[Symbol.isConcatSpreadable]` be true.
+ *   either be an array or have `.[Symbol.isConcatSpreadable]` be true.
  */
 export const isCollection = ($) => {
-  if (!(isObject($) && "length" in $)) {
+  if (!(type($) === "object" && "length" in $)) {
     // The provided value is not an object or does not have a `length`.
     return false;
   } else {
     try {
       toIndex($.length); // will throw if `length` is not an index
-      return isConcatSpreadable($);
+      return isConcatSpreadableObject($);
     } catch {
       return false;
     }
@@ -69,72 +223,70 @@ export const isCollection = ($) => {
 };
 
 /**
- * Returns whether the provided value is spreadable during array
- * concatenation.
- *
- * This is also used to determine which things should be treated as
- * collections.
+ * Returns an iterator over the items in the provided value according
+ * to the algorithm of `Array::values`.
  */
-export const isConcatSpreadable = ($) => {
-  if (!isObject($)) {
-    // The provided value is not an object.
-    return false;
-  } else {
-    // The provided value is an object.
-    return !!($[Symbol.isConcatSpreadable] ?? Array.isArray($));
-  }
-};
+export const items = createCallableFunction(
+  arrayPrototype.values,
+  "items",
+);
 
-/** Returns whether the provided value is an integer index. */
-export const isIntegerIndex = ($) => {
-  const value = canonicalNumericIndexString($);
-  if (value !== undefined) {
-    return Object.is(value, 0) ||
-      value > 0 && value <= MAX_SAFE_INTEGER;
-  } else {
-    return false;
-  }
-};
+/**
+ * Returns the result of mapping the provided value with the provided
+ * callback according to the algorithm of `Array::map`.
+ */
+export const map = createCallableFunction(arrayPrototype.map);
 
 /**
- * Returns the length of the provided arraylike object.
- *
- * Will throw if the provided object is not arraylike.
- *
- * This produces larger lengths than can actually be stored in arrays,
- * because no such restrictions exist on arraylike methods. Use
- * `isIndex` to determine if a value is an actual array index.
+ * Pops from the provided value according to the algorithm of
+ * `Array::pop`.
  */
-export const lengthOfArrayLike = ({ length }) => {
-  return toLength(length);
-};
+export const pop = createCallableFunction(arrayPrototype.pop);
 
 /**
- * Converts the provided value to an array index, or throws an error if
- * it is out of range.
+ * Pushes onto the provided value according to the algorithm of
+ * `Array::push`.
  */
-export const toIndex = ($) => {
-  const integer = Math.floor($);
-  if (isNaN(integer) || integer == 0) {
-    // The value is zero·like.
-    return 0;
-  } else {
-    // The value is not zero·like.
-    const clamped = toLength(integer);
-    if (clamped !== integer) {
-      // Clamping the value changes it.
-      throw new RangeError(`Piscēs: Index out of range: ${$}.`);
-    } else {
-      // The value is within appropriate bounds.
-      return integer;
-    }
-  }
-};
+export const push = createCallableFunction(arrayPrototype.push);
 
-/** Converts the provided value to a length. */
-export const toLength = ($) => {
-  const len = Math.floor($);
-  return isNaN(len) || len == 0
-    ? 0
-    : Math.max(Math.min(len, MAX_SAFE_INTEGER), 0);
-};
+/**
+ * Returns the result of reducing the provided value with the provided
+ * callback, according to the algorithm of `Array::reduce`.
+ */
+export const reduce = createCallableFunction(arrayPrototype.reduce);
+
+/**
+ * Reverses the provided value according to the algorithm of
+ * `Array::reverse`.
+ */
+export const reverse = createCallableFunction(arrayPrototype.reverse);
+
+/**
+ * Shifts the provided value according to the algorithm of
+ * `Array::shift`.
+ */
+export const shift = createCallableFunction(arrayPrototype.shift);
+
+/**
+ * Returns a slice of the provided value according to the algorithm of
+ * `Array::slice`.
+ */
+export const slice = createCallableFunction(arrayPrototype.slice);
+
+/**
+ * Sorts the provided value in‐place according to the algorithm of
+ * `Array::sort`.
+ */
+export const sort = createCallableFunction(arrayPrototype.sort);
+
+/**
+ * Splices into and out of the provided value according to the
+ * algorithm of `Array::splice`.
+ */
+export const splice = createCallableFunction(arrayPrototype.splice);
+
+/**
+ * Unshifts the provided value according to the algorithm of
+ * `Array::unshift`.
+ */
+export const unshift = createCallableFunction(arrayPrototype.unshift);