mirror of
https://github.com/matrix-construct/construct
synced 2024-11-15 06:21:06 +01:00
728 lines
15 KiB
JavaScript
728 lines
15 KiB
JavaScript
/*
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// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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*/
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'use strict';
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/*
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******************************************************************************
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******************************************************************************
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*
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* Abstract Utils
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*
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*/
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/**
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*/
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let defined = (value) =>
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value !== undefined;
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/** typeif - Functional if(typeof(foo) == "bar") { ... }
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*/
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let typeif = (value, type, closure) =>
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typeof(value) === type? closure() : undefined;
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/** typeswitch - Functional switch(typeof(value)). Allows type
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* cases to be defined more liberally in the dictionary argument as well.
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*/
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let typeswitch = (value, cases) =>
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{
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const type = typeof(value);
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const _case = cases[type];
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switch(typeof(_case))
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{
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case "undefined": return cases["default"];
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case "function": return _case();
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default: return _case;
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}
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};
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/** empty - What we consider to be "empty" values. Intended as the test
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* functor for the Object.clean() function (defined later) which removes
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* useless values from objects usually before transmitting or storing etc.
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*/
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let empty = (value) =>
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typeswitch(value,
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{
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"undefined": true,
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"object": () => value === null || !Object.keys(value).length,
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"string": () => !value.length,
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"function": false,
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"boolean": false,
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"number": false,
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"default": false,
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})
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;
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/** length -
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*/
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let length = (value) =>
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typeswitch(value,
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{
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"object": () => value === null? 0 : Object.keys(value).length,
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"string": () => value.length,
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"default": undefined,
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})
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;
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/** maybe - V8-style nested traversal which handles the exceptions for bad access.
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* Access a nested value inside the maybe() closure to return the value if valid,
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* or return undefined when it doesn't exist or can't be traversed etc.
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*
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* Consider object:
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* { foo: { bar: 'baz' } }
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*
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* let a = foo.bar.baz; // exception thrown (bad)
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* let b = maybe(() => foo.bar.baz); // b = undefined (good)
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* let c = maybe(() => foo.bar.baz.bam); // c = undefined (good)
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* let d = maybe(() => foo.bar); // d = 'baz' (good)
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*/
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let maybe = (closure = () => undefined) =>
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{
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try
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{
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return closure();
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}
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catch(e)
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{
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if(e instanceof ReferenceError)
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return undefined;
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if(e instanceof TypeError)
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return undefined;
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throw e;
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}
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};
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let mayif = (test = () => true, closure = () => undefined) =>
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{
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return maybe(() => closure(test()));
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};
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/**
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*/
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let toggle = (obj, key, value = undefined) =>
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{
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if(value === undefined)
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obj[key] =! obj[key];
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else
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obj[key] = value;
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};
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/**
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* Like "toggle" but prunes the object of the key when switching
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* to the false state.
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*/
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let togdel = (obj, key, value = true) =>
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{
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if(!(key in obj) && value !== false)
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obj[key] = value;
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else
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delete obj[key];
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};
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/**
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* Like "togdel" but checks the current value against the argument
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*/
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let togswap = (obj, key, value = true) =>
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{
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if((key in obj) && (obj[key] === value || value === false))
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delete obj[key];
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else if(value !== undefined)
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obj[key] = value;
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};
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/** Object.always() - Returns the argument unless undefined or null, then
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* an empty object is returned instead.
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*/
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Object.always = (obj) =>
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obj !== undefined && obj !== null? obj : {}
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;
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/** Object.each() - a forEach for an object where the closure argument
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* is presented with a (key, value) pair
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*/
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Object.each = (obj, closure) =>
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Object.keys(Object.always(obj)).forEach((key, i) =>
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closure(key, obj[key], i)
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)
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;
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/** Object.reach() - reverse iteration from Object.each()
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*/
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Object.reach = (obj, closure) =>
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Object.keys(Object.always(obj)).reverse().forEach((key, i) =>
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closure(key, obj[key], i)
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)
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;
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/** Object.oeach() - enumeration with own properties
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*/
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Object.oeach = (obj, closure) =>
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Object.getOwnPropertyNames(Object.always(obj)).forEach((key, i) =>
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closure(key, obj[key], i)
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)
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;
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/** Object.aeach() - enumeration of all properties
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*/
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Object.aeach = (obj, closure) =>
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{
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let i = 0;
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for(let key in obj)
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closure(key, obj[key], i++);
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return i;
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};
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/** Object.peach() - enumeration of prototype properties
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*/
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Object.peach = (obj, closure) =>
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{
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let i = 0;
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for(let key in obj)
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if(!obj.hasOwnProperty(key))
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closure(key, obj[key], i++);
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return i;
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};
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/** Object.ofeach()
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*/
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Object.ofeach = (obj, closure) =>
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{
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let i = 0;
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if(maybe(() => obj[Symbol.iterator] === 'function'))
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for(let [key, val] of obj)
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closure(key, val, i++);
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return i;
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};
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/** Object.map()
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*/
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Object.map = (obj, closure) =>
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{
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let ret = {};
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Object.each(obj, (key, val) =>
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ret[key] = closure(key, val)
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);
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return ret;
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};
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/** Object.values() - Fills in for the experimental Object.values() standard js
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* function which is not always available.
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*/
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Object.values = Object.values? Object.values : (obj) =>
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{
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const push = (val, key) =>
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{
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val.push(obj[key]);
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return val;
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};
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return Object.keys(Object.always(obj)).reduce(push, []);
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};
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/** Object.defaults() - Unlike Object.update(), an existing value in the target object
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* is not touched if it exists, otherwise the source value is used.
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* recursive.
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*/
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Object.defaults = (tgt,
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src,
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enumerator = Object.each) =>
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enumerator(src, (key, val) =>
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{
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if(typeof(tgt[key]) == "undefined")
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{
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if(typeof(val) == "object")
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tgt[key] = Object.copy(val, enumerator);
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else
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tgt[key] = val;
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}
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else if(typeof(tgt[key]) == "object")
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{
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if(typeof(val) == "object")
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Object.defaults(tgt[key], val, enumerator);
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}
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});
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/** Object.update() - Like Object.assign() it writes over the target property
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* with the source property, but recursively in tgt.
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* recursive.
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*/
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Object.update = (tgt,
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src,
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enumerator = Object.each) =>
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enumerator(src, (key, val) =>
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{
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if(typeof(val) == "object")
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{
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if(typeof(tgt[key]) != "object")
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tgt[key] = Object.copy(val, enumerator);
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else
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Object.update(tgt[key], val, enumerator);
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}
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else tgt[key] = val;
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});
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/** Object.clear()
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*/
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Object.clear = (src,
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enumerator = Object.each) =>
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enumerator(src, (key, val) =>
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{
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delete src[key];
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});
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/** Object.clean() - Recursively strip keys in an object where the value passes the test.
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* The test is empty() by default. Objects like {foo: undefined} which still enumerate
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* the key 'foo' as a member can have 'foo' deleted using this function.
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* recursive.
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*/
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Object.clean = (obj,
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test = empty,
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enumerator = Object.each) =>
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enumerator(obj, (key, val) =>
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{
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switch(typeof(val))
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{
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case "object":
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Object.clean(val, test, enumerator);
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//[[fallthrough]]
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default:
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if(test(val))
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delete obj[key];
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break;
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};
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});
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/** Object.copy() - Creates and returns fresh object updated from src
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* recursive.
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*/
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Object.copy = (src,
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enumerator = Object.each) =>
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{
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const tgts =
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{
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"object": Array.isArray(src)? [] : {},
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"default": {},
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};
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const tgt = typeswitch(src, tgts);
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Object.update(tgt, src, enumerator);
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return tgt;
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};
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/** Object.copy() - Creates and returns fresh object updated from src
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* recursive.
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*/
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Object.copy.include = (src,
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whitelist = [],
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enumerator = Object.each) =>
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{
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whitelist = typeswitch(whitelist,
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{
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"object": whitelist,
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"string": [whitelist],
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});
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const tgt = typeswitch(src,
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{
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"object": Array.isArray(src)? [] : {},
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"default": {},
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});
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Object.update(tgt, src, (obj, closure) =>
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enumerator(obj, (key, val) =>
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{
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if((key in whitelist))
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closure(key, val);
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})
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);
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return tgt;
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};
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/** Object.copy() - Creates and returns fresh object updated from src
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* recursive.
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*/
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Object.copy.exclude = (src,
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blacklist = [],
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enumerator = Object.each) =>
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{
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blacklist = typeswitch(blacklist,
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{
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"object": blacklist,
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"string": [blacklist],
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});
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const tgt = typeswitch(src,
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{
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"object": Array.isArray(src)? [] : {},
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"default": {},
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});
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Object.update(tgt, src, (obj, closure) =>
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enumerator(obj, (key, val) =>
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{
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if(!(key in blacklist))
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closure(key, val);
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})
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);
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return tgt;
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};
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/** Object.defaults() - Unlike Object.update(), an existing value in the target object
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* is not touched if it exists, otherwise the source value is used.
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* recursive.
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*/
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Object.defaulting = (tgt,
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key,
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defaulting_value = {}) =>
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{
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if(!(key in tgt)) switch(typeof(defaulting_value))
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{
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case "object":
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tgt[key] = Object.copy(defaulting_value);
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break;
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case "function":
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tgt[key] = defaulting_value();
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break;
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default:
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tgt[key] = defaulting_value;
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break;
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}
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return tgt[key];
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}
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/* This is obviously no good if you don't leave the last element off your path
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*/
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Object.traverse = (obj, path) =>
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{
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path.forEach((part) =>
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obj = obj[part]
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);
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return obj;
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};
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/* Traverse the path up to the second to last element
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*/
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Object.penultimate = (obj, path) =>
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Object.traverse(obj, path.slice(0, path.length - 1));
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/* Traverses the path to present the parent and child at the destination
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*/
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Object.terminal_edge = (obj, path, destination) =>
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destination(Object.dotdot(obj, path)[path.back()], Object.dotdot(obj, path));
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/** set theory suite
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*/
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Object.union = (a, b, closure) =>
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{
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Object.keys(a).map((key, i) =>
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{
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closure(key);
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});
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Object.keys(b).map((key, i) =>
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{
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if(!(key in a))
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closure(key);
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});
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};
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/** set theory suite
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*/
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Object.intersection = (a, b, closure) =>
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Object.keys(a).map((key, i) =>
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{
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if((key in b))
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closure(key);
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});
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;
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/** set theory suite
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*/
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Object.difference = (a, b, closure) =>
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Object.keys(a).map((key, i) =>
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{
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if(!(key in b))
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closure(key);
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});
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;
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/** set theory suite
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*/
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Object.symmetric_difference = (a, b, closure) =>
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{
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Object.difference(a, b, closure);
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Object.difference(b, a, closure);
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};
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/** Count returns an integer for the number of elements
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* that pass the condition
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*/
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Array.count = function(array, condition)
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{
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const reducer = (acc, val) => acc += val;
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const mapper = (element, index, array) => condition(element, index, array)? true : false;
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return array.map(mapper).reduce(reducer, 0);
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};
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/** C++ style first-element access
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*/
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Object.defineProperty(Array.prototype, 'front',
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{
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writable: false,
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enumerable: false,
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configurable: false,
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value: function()
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{
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return (this)[0];
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},
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});
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/** C++ style last-element access
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*/
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Object.defineProperty(Array.prototype, 'back',
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{
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writable: false,
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enumerable: false,
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configurable: false,
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value: function()
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{
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return (this)[this.length - 1];
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},
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});
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/** filterIndex() returns an array of indexes rather than values
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*/
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Object.defineProperty(Array.prototype, 'filterIndex',
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{
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writable: false,
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enumerable: false,
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configurable: false,
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value: function(condition)
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{
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let ret = [];
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this.forEach((element, index, array) =>
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{
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if(condition(element, index, array))
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ret.push(index);
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});
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return ret;
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},
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});
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/** Non-cryptographic Bernstein string hasher
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*/
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Object.defineProperty(String.prototype, 'hash',
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{
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writable: false,
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enumerable: false,
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configurable: false,
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value: function(ret = 7681, i = 0)
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{
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for(; i < this.length; i++)
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ret = (ret * 33) ^ this.charCodeAt(i);
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return ret;
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},
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});
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/* Augmentation of Function
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*/
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const Class =
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{
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construction: Symbol("Class.construction"),
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};
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/** Bind a tree of functions organized into namespaces (using
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* a nested object hierarchy) to a this value
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*/
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Function.bindtree = function(obj, that, ...args)
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{
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const binding = function(src, that)
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{
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let ret = typeswitch(src,
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{
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"function": () =>
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{
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switch(src[Class.construction])
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{
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case true:
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return new src(that, ...args);
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default:
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return src.bind(that);
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}
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},
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"object": () =>
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{
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try
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{
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return Object.create(new src.__proto__(that));
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}
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catch(e) {}
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try
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{
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return Object.create(src.__proto__);
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}
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catch(e) {}
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return Object.create(Object.prototype);
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},
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});
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Object.each(src, (name, func) =>
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{
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switch(typeof(func))
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{
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case "function":
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case "object":
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ret[name] = binding(src[name], that);
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break;
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default:
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ret[name] = src[name];
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break;
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}
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});
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return ret;
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};
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return binding(obj, that);
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};
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/** Bind a tree of functions organized into namespaces (using
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* a nested object hierarchy) to a this value
|
|
*/
|
|
Function.bindtree.self = function(self, obj, that = self)
|
|
{
|
|
Object.update(self, Function.bindtree(obj, that));
|
|
};
|
|
|
|
/** Extend this class to bind a tree of functions to your class.
|
|
*
|
|
* In your ctor: super(tree.root);
|
|
*/
|
|
Object.bindtree = class
|
|
{
|
|
constructor(obj, opts = {}, that = this)
|
|
{
|
|
Object.each(obj, (name, branch) =>
|
|
{
|
|
opts.value = Function.bindtree(branch, that);
|
|
Object.defineProperty(that, name, opts);
|
|
});
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Creates a proxy handler which always returns more proxies instead of plain
|
|
* objects. The mission here is to have objects returned from anywhere under
|
|
* the root always have their access completely handled.
|
|
*/
|
|
Proxy.recursive = class
|
|
{
|
|
constructor()
|
|
{
|
|
//console.log("Proxy.recursive");
|
|
}
|
|
|
|
get(state, key, proxy)
|
|
{
|
|
console.log("Proxy.recursive.get(" + key + ") ((" + typeof(state[key]) + "))");
|
|
|
|
switch(typeof(state[key]))
|
|
{
|
|
case "object":
|
|
case "function":
|
|
return new Proxy(state[key], new Proxy.recursive());
|
|
|
|
default:
|
|
return state[key];
|
|
}
|
|
}
|
|
|
|
set(state, key, val, proxy)
|
|
{
|
|
console.log("Proxy.recursive.set(" + key + ", " + typeof(val) + ")");
|
|
|
|
switch(typeof(val))
|
|
{
|
|
case "object":
|
|
case "function":
|
|
state[key] = new Proxy(val, new Proxy.recursive());
|
|
return true;
|
|
|
|
default:
|
|
state[key] = val;
|
|
return true;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
};
|
|
|
|
/**************************************
|
|
*
|
|
* Additional tools
|
|
*
|
|
*/
|
|
|
|
/** When using a "last argument is always the callback" convention, this finds that
|
|
* last argument of the function in which this is called and attempts to call it and
|
|
* forward the supplied arguments. Silent errors.
|
|
*/
|
|
function callback(arguments_object, ...callback_arguments)
|
|
{
|
|
if(!arguments_object.length)
|
|
return;
|
|
|
|
const user_function = arguments_object[arguments_object.length - 1];
|
|
if(typeof(user_function) != "function")
|
|
return;
|
|
|
|
return user_function(...callback_arguments);
|
|
}
|
|
|
|
/**
|
|
* Validate a string is a domain name (weak)
|
|
*/
|
|
function valid_domain(string)
|
|
{
|
|
if(typeof(string) != "string")
|
|
return false;
|
|
|
|
if(!string.length)
|
|
return false;
|
|
|
|
return valid_domain.expression.test(string);
|
|
}
|
|
|
|
//TODO: improve me
|
|
valid_domain.expression = new RegExp("^[a-zA-Z0-9][a-zA-Z0-9-]{1,61}[a-zA-Z0-9](?:\.[a-zA-Z]{1,})*$");
|