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'use strict';
const {
VOID, PRIMITIVE, ARRAY, OBJECT, DATE, REGEXP, MAP, SET, ERROR, BIGINT
} = require('./types.js');
const EMPTY = '';
const {toString} = {};
const {keys} = Object;
const typeOf = value => {
const type = typeof value;
if (type !== 'object' || !value)
return [PRIMITIVE, type];
const asString = toString.call(value).slice(8, -1);
switch (asString) {
case 'Array':
return [ARRAY, EMPTY];
case 'Object':
return [OBJECT, EMPTY];
case 'Date':
return [DATE, EMPTY];
case 'RegExp':
return [REGEXP, EMPTY];
case 'Map':
return [MAP, EMPTY];
case 'Set':
return [SET, EMPTY];
}
if (asString.includes('Array'))
return [ARRAY, asString];
if (asString.includes('Error'))
return [ERROR, asString];
return [OBJECT, asString];
};
const shouldSkip = ([TYPE, type]) => (
TYPE === PRIMITIVE &&
(type === 'function' || type === 'symbol')
);
const serializer = (strict, json, $, _) => {
const as = (out, value) => {
const index = _.push(out) - 1;
$.set(value, index);
return index;
};
const pair = value => {
if ($.has(value))
return $.get(value);
let [TYPE, type] = typeOf(value);
switch (TYPE) {
case PRIMITIVE: {
let entry = value;
switch (type) {
case 'bigint':
TYPE = BIGINT;
entry = value.toString();
break;
case 'function':
case 'symbol':
if (strict)
throw new TypeError('unable to serialize ' + type);
entry = null;
break;
case 'undefined':
return as([VOID], value);
}
return as([TYPE, entry], value);
}
case ARRAY: {
if (type)
return as([type, [...value]], value);
const arr = [];
const index = as([TYPE, arr], value);
for (const entry of value)
arr.push(pair(entry));
return index;
}
case OBJECT: {
if (type) {
switch (type) {
case 'BigInt':
return as([type, value.toString()], value);
case 'Boolean':
case 'Number':
case 'String':
return as([type, value.valueOf()], value);
}
}
if (json && ('toJSON' in value))
return pair(value.toJSON());
const entries = [];
const index = as([TYPE, entries], value);
for (const key of keys(value)) {
if (strict || !shouldSkip(typeOf(value[key])))
entries.push([pair(key), pair(value[key])]);
}
return index;
}
case DATE:
return as([TYPE, value.toISOString()], value);
case REGEXP: {
const {source, flags} = value;
return as([TYPE, {source, flags}], value);
}
case MAP: {
const entries = [];
const index = as([TYPE, entries], value);
for (const [key, entry] of value) {
if (strict || !(shouldSkip(typeOf(key)) || shouldSkip(typeOf(entry))))
entries.push([pair(key), pair(entry)]);
}
return index;
}
case SET: {
const entries = [];
const index = as([TYPE, entries], value);
for (const entry of value) {
if (strict || !shouldSkip(typeOf(entry)))
entries.push(pair(entry));
}
return index;
}
}
const {message} = value;
return as([TYPE, {name: type, message}], value);
};
return pair;
};
/**
* @typedef {Array<string,any>} Record a type representation
*/
/**
* Returns an array of serialized Records.
* @param {any} value a serializable value.
* @param {{json?: boolean, lossy?: boolean}?} options an object with a `lossy` or `json` property that,
* if `true`, will not throw errors on incompatible types, and behave more
* like JSON stringify would behave. Symbol and Function will be discarded.
* @returns {Record[]}
*/
const serialize = (value, {json, lossy} = {}) => {
const _ = [];
return serializer(!(json || lossy), !!json, new Map, _)(value), _;
};
exports.serialize = serialize;
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