mirror of
https://github.com/matrix-construct/construct
synced 2024-11-14 14:01:08 +01:00
728 lines
15 KiB
JavaScript
728 lines
15 KiB
JavaScript
/*
|
|
// Matrix Construct
|
|
//
|
|
// Copyright (C) Matrix Construct Developers, Authors & Contributors
|
|
// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
|
|
//
|
|
// Permission to use, copy, modify, and/or distribute this software for any
|
|
// purpose with or without fee is hereby granted, provided that the above
|
|
// copyright notice and this permission notice is present in all copies. The
|
|
// full license for this software is available in the LICENSE file.
|
|
*/
|
|
|
|
'use strict';
|
|
|
|
|
|
/*
|
|
******************************************************************************
|
|
******************************************************************************
|
|
*
|
|
* Abstract Utils
|
|
*
|
|
*/
|
|
|
|
/**
|
|
*/
|
|
let defined = (value) =>
|
|
value !== undefined;
|
|
|
|
/** typeif - Functional if(typeof(foo) == "bar") { ... }
|
|
*/
|
|
let typeif = (value, type, closure) =>
|
|
typeof(value) === type? closure() : undefined;
|
|
|
|
/** typeswitch - Functional switch(typeof(value)). Allows type
|
|
* cases to be defined more liberally in the dictionary argument as well.
|
|
*/
|
|
let typeswitch = (value, cases) =>
|
|
{
|
|
const type = typeof(value);
|
|
const _case = cases[type];
|
|
switch(typeof(_case))
|
|
{
|
|
case "undefined": return cases["default"];
|
|
case "function": return _case();
|
|
default: return _case;
|
|
}
|
|
};
|
|
|
|
/** empty - What we consider to be "empty" values. Intended as the test
|
|
* functor for the Object.clean() function (defined later) which removes
|
|
* useless values from objects usually before transmitting or storing etc.
|
|
*/
|
|
let empty = (value) =>
|
|
typeswitch(value,
|
|
{
|
|
"undefined": true,
|
|
"object": () => value === null || !Object.keys(value).length,
|
|
"string": () => !value.length,
|
|
"function": false,
|
|
"boolean": false,
|
|
"number": false,
|
|
"default": false,
|
|
})
|
|
;
|
|
|
|
/** length -
|
|
*/
|
|
let length = (value) =>
|
|
typeswitch(value,
|
|
{
|
|
"object": () => value === null? 0 : Object.keys(value).length,
|
|
"string": () => value.length,
|
|
"default": undefined,
|
|
})
|
|
;
|
|
|
|
/** maybe - V8-style nested traversal which handles the exceptions for bad access.
|
|
* Access a nested value inside the maybe() closure to return the value if valid,
|
|
* or return undefined when it doesn't exist or can't be traversed etc.
|
|
*
|
|
* Consider object:
|
|
* { foo: { bar: 'baz' } }
|
|
*
|
|
* let a = foo.bar.baz; // exception thrown (bad)
|
|
* let b = maybe(() => foo.bar.baz); // b = undefined (good)
|
|
* let c = maybe(() => foo.bar.baz.bam); // c = undefined (good)
|
|
* let d = maybe(() => foo.bar); // d = 'baz' (good)
|
|
*/
|
|
let maybe = (closure = () => undefined) =>
|
|
{
|
|
try
|
|
{
|
|
return closure();
|
|
}
|
|
catch(e)
|
|
{
|
|
if(e instanceof ReferenceError)
|
|
return undefined;
|
|
|
|
if(e instanceof TypeError)
|
|
return undefined;
|
|
|
|
throw e;
|
|
}
|
|
};
|
|
|
|
let mayif = (test = () => true, closure = () => undefined) =>
|
|
{
|
|
return maybe(() => closure(test()));
|
|
};
|
|
|
|
/**
|
|
*/
|
|
let toggle = (obj, key, value = undefined) =>
|
|
{
|
|
if(value === undefined)
|
|
obj[key] =! obj[key];
|
|
else
|
|
obj[key] = value;
|
|
};
|
|
|
|
/**
|
|
* Like "toggle" but prunes the object of the key when switching
|
|
* to the false state.
|
|
*/
|
|
let togdel = (obj, key, value = true) =>
|
|
{
|
|
if(!(key in obj) && value !== false)
|
|
obj[key] = value;
|
|
else
|
|
delete obj[key];
|
|
};
|
|
|
|
/**
|
|
* Like "togdel" but checks the current value against the argument
|
|
*/
|
|
let togswap = (obj, key, value = true) =>
|
|
{
|
|
if((key in obj) && (obj[key] === value || value === false))
|
|
delete obj[key];
|
|
else if(value !== undefined)
|
|
obj[key] = value;
|
|
};
|
|
|
|
/** Object.always() - Returns the argument unless undefined or null, then
|
|
* an empty object is returned instead.
|
|
*/
|
|
Object.always = (obj) =>
|
|
obj !== undefined && obj !== null? obj : {}
|
|
;
|
|
|
|
/** Object.each() - a forEach for an object where the closure argument
|
|
* is presented with a (key, value) pair
|
|
*/
|
|
Object.each = (obj, closure) =>
|
|
Object.keys(Object.always(obj)).forEach((key, i) =>
|
|
closure(key, obj[key], i)
|
|
)
|
|
;
|
|
|
|
/** Object.reach() - reverse iteration from Object.each()
|
|
*/
|
|
Object.reach = (obj, closure) =>
|
|
Object.keys(Object.always(obj)).reverse().forEach((key, i) =>
|
|
closure(key, obj[key], i)
|
|
)
|
|
;
|
|
|
|
/** Object.oeach() - enumeration with own properties
|
|
*/
|
|
Object.oeach = (obj, closure) =>
|
|
Object.getOwnPropertyNames(Object.always(obj)).forEach((key, i) =>
|
|
closure(key, obj[key], i)
|
|
)
|
|
;
|
|
|
|
/** Object.aeach() - enumeration of all properties
|
|
*/
|
|
Object.aeach = (obj, closure) =>
|
|
{
|
|
let i = 0;
|
|
for(let key in obj)
|
|
closure(key, obj[key], i++);
|
|
|
|
return i;
|
|
};
|
|
|
|
/** Object.peach() - enumeration of prototype properties
|
|
*/
|
|
Object.peach = (obj, closure) =>
|
|
{
|
|
let i = 0;
|
|
for(let key in obj)
|
|
if(!obj.hasOwnProperty(key))
|
|
closure(key, obj[key], i++);
|
|
|
|
return i;
|
|
};
|
|
|
|
/** Object.ofeach()
|
|
*/
|
|
Object.ofeach = (obj, closure) =>
|
|
{
|
|
let i = 0;
|
|
if(maybe(() => obj[Symbol.iterator] === 'function'))
|
|
for(let [key, val] of obj)
|
|
closure(key, val, i++);
|
|
|
|
return i;
|
|
};
|
|
|
|
/** Object.map()
|
|
*/
|
|
Object.map = (obj, closure) =>
|
|
{
|
|
let ret = {};
|
|
Object.each(obj, (key, val) =>
|
|
ret[key] = closure(key, val)
|
|
);
|
|
|
|
return ret;
|
|
};
|
|
|
|
/** Object.values() - Fills in for the experimental Object.values() standard js
|
|
* function which is not always available.
|
|
*/
|
|
Object.values = Object.values? Object.values : (obj) =>
|
|
{
|
|
const push = (val, key) =>
|
|
{
|
|
val.push(obj[key]);
|
|
return val;
|
|
};
|
|
|
|
return Object.keys(Object.always(obj)).reduce(push, []);
|
|
};
|
|
|
|
/** Object.defaults() - Unlike Object.update(), an existing value in the target object
|
|
* is not touched if it exists, otherwise the source value is used.
|
|
* recursive.
|
|
*/
|
|
Object.defaults = (tgt,
|
|
src,
|
|
enumerator = Object.each) =>
|
|
enumerator(src, (key, val) =>
|
|
{
|
|
if(typeof(tgt[key]) == "undefined")
|
|
{
|
|
if(typeof(val) == "object")
|
|
tgt[key] = Object.copy(val, enumerator);
|
|
else
|
|
tgt[key] = val;
|
|
}
|
|
else if(typeof(tgt[key]) == "object")
|
|
{
|
|
if(typeof(val) == "object")
|
|
Object.defaults(tgt[key], val, enumerator);
|
|
}
|
|
});
|
|
|
|
/** Object.update() - Like Object.assign() it writes over the target property
|
|
* with the source property, but recursively in tgt.
|
|
* recursive.
|
|
*/
|
|
Object.update = (tgt,
|
|
src,
|
|
enumerator = Object.each) =>
|
|
enumerator(src, (key, val) =>
|
|
{
|
|
if(typeof(val) == "object")
|
|
{
|
|
if(typeof(tgt[key]) != "object")
|
|
tgt[key] = Object.copy(val, enumerator);
|
|
else
|
|
Object.update(tgt[key], val, enumerator);
|
|
}
|
|
else tgt[key] = val;
|
|
});
|
|
|
|
/** Object.clear()
|
|
*/
|
|
Object.clear = (src,
|
|
enumerator = Object.each) =>
|
|
enumerator(src, (key, val) =>
|
|
{
|
|
delete src[key];
|
|
});
|
|
|
|
/** Object.clean() - Recursively strip keys in an object where the value passes the test.
|
|
* The test is empty() by default. Objects like {foo: undefined} which still enumerate
|
|
* the key 'foo' as a member can have 'foo' deleted using this function.
|
|
* recursive.
|
|
*/
|
|
Object.clean = (obj,
|
|
test = empty,
|
|
enumerator = Object.each) =>
|
|
enumerator(obj, (key, val) =>
|
|
{
|
|
switch(typeof(val))
|
|
{
|
|
case "object":
|
|
Object.clean(val, test, enumerator);
|
|
//[[fallthrough]]
|
|
|
|
default:
|
|
if(test(val))
|
|
delete obj[key];
|
|
|
|
break;
|
|
};
|
|
});
|
|
|
|
/** Object.copy() - Creates and returns fresh object updated from src
|
|
* recursive.
|
|
*/
|
|
Object.copy = (src,
|
|
enumerator = Object.each) =>
|
|
{
|
|
const tgts =
|
|
{
|
|
"object": Array.isArray(src)? [] : {},
|
|
"default": {},
|
|
};
|
|
|
|
const tgt = typeswitch(src, tgts);
|
|
Object.update(tgt, src, enumerator);
|
|
return tgt;
|
|
};
|
|
|
|
/** Object.copy() - Creates and returns fresh object updated from src
|
|
* recursive.
|
|
*/
|
|
Object.copy.include = (src,
|
|
whitelist = [],
|
|
enumerator = Object.each) =>
|
|
{
|
|
whitelist = typeswitch(whitelist,
|
|
{
|
|
"object": whitelist,
|
|
"string": [whitelist],
|
|
});
|
|
|
|
const tgt = typeswitch(src,
|
|
{
|
|
"object": Array.isArray(src)? [] : {},
|
|
"default": {},
|
|
});
|
|
|
|
Object.update(tgt, src, (obj, closure) =>
|
|
enumerator(obj, (key, val) =>
|
|
{
|
|
if((key in whitelist))
|
|
closure(key, val);
|
|
})
|
|
);
|
|
|
|
return tgt;
|
|
};
|
|
|
|
/** Object.copy() - Creates and returns fresh object updated from src
|
|
* recursive.
|
|
*/
|
|
Object.copy.exclude = (src,
|
|
blacklist = [],
|
|
enumerator = Object.each) =>
|
|
{
|
|
blacklist = typeswitch(blacklist,
|
|
{
|
|
"object": blacklist,
|
|
"string": [blacklist],
|
|
});
|
|
|
|
const tgt = typeswitch(src,
|
|
{
|
|
"object": Array.isArray(src)? [] : {},
|
|
"default": {},
|
|
});
|
|
|
|
Object.update(tgt, src, (obj, closure) =>
|
|
enumerator(obj, (key, val) =>
|
|
{
|
|
if(!(key in blacklist))
|
|
closure(key, val);
|
|
})
|
|
);
|
|
|
|
return tgt;
|
|
};
|
|
|
|
/** Object.defaults() - Unlike Object.update(), an existing value in the target object
|
|
* is not touched if it exists, otherwise the source value is used.
|
|
* recursive.
|
|
*/
|
|
Object.defaulting = (tgt,
|
|
key,
|
|
defaulting_value = {}) =>
|
|
{
|
|
if(!(key in tgt)) switch(typeof(defaulting_value))
|
|
{
|
|
case "object":
|
|
tgt[key] = Object.copy(defaulting_value);
|
|
break;
|
|
|
|
case "function":
|
|
tgt[key] = defaulting_value();
|
|
break;
|
|
|
|
default:
|
|
tgt[key] = defaulting_value;
|
|
break;
|
|
}
|
|
|
|
return tgt[key];
|
|
}
|
|
|
|
/* This is obviously no good if you don't leave the last element off your path
|
|
*/
|
|
Object.traverse = (obj, path) =>
|
|
{
|
|
path.forEach((part) =>
|
|
obj = obj[part]
|
|
);
|
|
|
|
return obj;
|
|
};
|
|
|
|
/* Traverse the path up to the second to last element
|
|
*/
|
|
Object.penultimate = (obj, path) =>
|
|
Object.traverse(obj, path.slice(0, path.length - 1));
|
|
|
|
/* Traverses the path to present the parent and child at the destination
|
|
*/
|
|
Object.terminal_edge = (obj, path, destination) =>
|
|
destination(Object.dotdot(obj, path)[path.back()], Object.dotdot(obj, path));
|
|
|
|
/** set theory suite
|
|
*/
|
|
Object.union = (a, b, closure) =>
|
|
{
|
|
Object.keys(a).map((key, i) =>
|
|
{
|
|
closure(key);
|
|
});
|
|
|
|
Object.keys(b).map((key, i) =>
|
|
{
|
|
if(!(key in a))
|
|
closure(key);
|
|
});
|
|
};
|
|
|
|
/** set theory suite
|
|
*/
|
|
Object.intersection = (a, b, closure) =>
|
|
Object.keys(a).map((key, i) =>
|
|
{
|
|
if((key in b))
|
|
closure(key);
|
|
});
|
|
;
|
|
|
|
/** set theory suite
|
|
*/
|
|
Object.difference = (a, b, closure) =>
|
|
Object.keys(a).map((key, i) =>
|
|
{
|
|
if(!(key in b))
|
|
closure(key);
|
|
});
|
|
;
|
|
|
|
/** set theory suite
|
|
*/
|
|
Object.symmetric_difference = (a, b, closure) =>
|
|
{
|
|
Object.difference(a, b, closure);
|
|
Object.difference(b, a, closure);
|
|
};
|
|
|
|
/** Count returns an integer for the number of elements
|
|
* that pass the condition
|
|
*/
|
|
Array.count = function(array, condition)
|
|
{
|
|
const reducer = (acc, val) => acc += val;
|
|
const mapper = (element, index, array) => condition(element, index, array)? true : false;
|
|
return array.map(mapper).reduce(reducer, 0);
|
|
};
|
|
|
|
/** C++ style first-element access
|
|
*/
|
|
Object.defineProperty(Array.prototype, 'front',
|
|
{
|
|
writable: false,
|
|
enumerable: false,
|
|
configurable: false,
|
|
value: function()
|
|
{
|
|
return (this)[0];
|
|
},
|
|
});
|
|
|
|
/** C++ style last-element access
|
|
*/
|
|
Object.defineProperty(Array.prototype, 'back',
|
|
{
|
|
writable: false,
|
|
enumerable: false,
|
|
configurable: false,
|
|
value: function()
|
|
{
|
|
return (this)[this.length - 1];
|
|
},
|
|
});
|
|
|
|
/** filterIndex() returns an array of indexes rather than values
|
|
*/
|
|
Object.defineProperty(Array.prototype, 'filterIndex',
|
|
{
|
|
writable: false,
|
|
enumerable: false,
|
|
configurable: false,
|
|
value: function(condition)
|
|
{
|
|
let ret = [];
|
|
this.forEach((element, index, array) =>
|
|
{
|
|
if(condition(element, index, array))
|
|
ret.push(index);
|
|
});
|
|
|
|
return ret;
|
|
},
|
|
});
|
|
|
|
/** Non-cryptographic Bernstein string hasher
|
|
*/
|
|
Object.defineProperty(String.prototype, 'hash',
|
|
{
|
|
writable: false,
|
|
enumerable: false,
|
|
configurable: false,
|
|
value: function(ret = 7681, i = 0)
|
|
{
|
|
for(; i < this.length; i++)
|
|
ret = (ret * 33) ^ this.charCodeAt(i);
|
|
|
|
return ret;
|
|
},
|
|
});
|
|
|
|
/* Augmentation of Function
|
|
*/
|
|
const Class =
|
|
{
|
|
construction: Symbol("Class.construction"),
|
|
};
|
|
|
|
/** Bind a tree of functions organized into namespaces (using
|
|
* a nested object hierarchy) to a this value
|
|
*/
|
|
Function.bindtree = function(obj, that, ...args)
|
|
{
|
|
const binding = function(src, that)
|
|
{
|
|
let ret = typeswitch(src,
|
|
{
|
|
"function": () =>
|
|
{
|
|
switch(src[Class.construction])
|
|
{
|
|
case true:
|
|
return new src(that, ...args);
|
|
|
|
default:
|
|
return src.bind(that);
|
|
}
|
|
},
|
|
|
|
"object": () =>
|
|
{
|
|
try
|
|
{
|
|
return Object.create(new src.__proto__(that));
|
|
}
|
|
catch(e) {}
|
|
|
|
try
|
|
{
|
|
return Object.create(src.__proto__);
|
|
}
|
|
catch(e) {}
|
|
|
|
return Object.create(Object.prototype);
|
|
},
|
|
});
|
|
|
|
Object.each(src, (name, func) =>
|
|
{
|
|
switch(typeof(func))
|
|
{
|
|
case "function":
|
|
case "object":
|
|
ret[name] = binding(src[name], that);
|
|
break;
|
|
|
|
default:
|
|
ret[name] = src[name];
|
|
break;
|
|
}
|
|
});
|
|
|
|
return ret;
|
|
};
|
|
|
|
return binding(obj, that);
|
|
};
|
|
|
|
/** Bind a tree of functions organized into namespaces (using
|
|
* 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,})*$");
|