var chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_$';
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var unsafeChars = /[<>\b\f\n\r\t\0\u2028\u2029]/g;
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var reserved = /^(?:do|if|in|for|int|let|new|try|var|byte|case|char|else|enum|goto|long|this|void|with|await|break|catch|class|const|final|float|short|super|throw|while|yield|delete|double|export|import|native|return|switch|throws|typeof|boolean|default|extends|finally|package|private|abstract|continue|debugger|function|volatile|interface|protected|transient|implements|instanceof|synchronized)$/;
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var escaped = {
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'<': '\\u003C',
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'>': '\\u003E',
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'/': '\\u002F',
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'\\': '\\\\',
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'\b': '\\b',
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'\f': '\\f',
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'\n': '\\n',
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'\r': '\\r',
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'\t': '\\t',
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'\0': '\\0',
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'\u2028': '\\u2028',
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'\u2029': '\\u2029'
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};
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var objectProtoOwnPropertyNames = Object.getOwnPropertyNames(Object.prototype).sort().join('\0');
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function devalue(value) {
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var counts = new Map();
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function walk(thing) {
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if (typeof thing === 'function') {
|
throw new Error("Cannot stringify a function");
|
}
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if (counts.has(thing)) {
|
counts.set(thing, counts.get(thing) + 1);
|
return;
|
}
|
counts.set(thing, 1);
|
if (!isPrimitive(thing)) {
|
var type = getType(thing);
|
switch (type) {
|
case 'Number':
|
case 'String':
|
case 'Boolean':
|
case 'Date':
|
case 'RegExp':
|
return;
|
case 'Array':
|
thing.forEach(walk);
|
break;
|
case 'Set':
|
case 'Map':
|
Array.from(thing).forEach(walk);
|
break;
|
default:
|
var proto = Object.getPrototypeOf(thing);
|
if (proto !== Object.prototype &&
|
proto !== null &&
|
Object.getOwnPropertyNames(proto).sort().join('\0') !== objectProtoOwnPropertyNames) {
|
throw new Error("Cannot stringify arbitrary non-POJOs");
|
}
|
if (Object.getOwnPropertySymbols(thing).length > 0) {
|
throw new Error("Cannot stringify POJOs with symbolic keys");
|
}
|
Object.keys(thing).forEach(function (key) { return walk(thing[key]); });
|
}
|
}
|
}
|
walk(value);
|
var names = new Map();
|
Array.from(counts)
|
.filter(function (entry) { return entry[1] > 1; })
|
.sort(function (a, b) { return b[1] - a[1]; })
|
.forEach(function (entry, i) {
|
names.set(entry[0], getName(i));
|
});
|
function stringify(thing) {
|
if (names.has(thing)) {
|
return names.get(thing);
|
}
|
if (isPrimitive(thing)) {
|
return stringifyPrimitive(thing);
|
}
|
var type = getType(thing);
|
switch (type) {
|
case 'Number':
|
case 'String':
|
case 'Boolean':
|
return "Object(" + stringify(thing.valueOf()) + ")";
|
case 'RegExp':
|
return "new RegExp(" + stringifyString(thing.source) + ", \"" + thing.flags + "\")";
|
case 'Date':
|
return "new Date(" + thing.getTime() + ")";
|
case 'Array':
|
var members = thing.map(function (v, i) { return i in thing ? stringify(v) : ''; });
|
var tail = thing.length === 0 || (thing.length - 1 in thing) ? '' : ',';
|
return "[" + members.join(',') + tail + "]";
|
case 'Set':
|
case 'Map':
|
return "new " + type + "([" + Array.from(thing).map(stringify).join(',') + "])";
|
default:
|
var obj = "{" + Object.keys(thing).map(function (key) { return safeKey(key) + ":" + stringify(thing[key]); }).join(',') + "}";
|
var proto = Object.getPrototypeOf(thing);
|
if (proto === null) {
|
return Object.keys(thing).length > 0
|
? "Object.assign(Object.create(null)," + obj + ")"
|
: "Object.create(null)";
|
}
|
return obj;
|
}
|
}
|
var str = stringify(value);
|
if (names.size) {
|
var params_1 = [];
|
var statements_1 = [];
|
var values_1 = [];
|
names.forEach(function (name, thing) {
|
params_1.push(name);
|
if (isPrimitive(thing)) {
|
values_1.push(stringifyPrimitive(thing));
|
return;
|
}
|
var type = getType(thing);
|
switch (type) {
|
case 'Number':
|
case 'String':
|
case 'Boolean':
|
values_1.push("Object(" + stringify(thing.valueOf()) + ")");
|
break;
|
case 'RegExp':
|
values_1.push(thing.toString());
|
break;
|
case 'Date':
|
values_1.push("new Date(" + thing.getTime() + ")");
|
break;
|
case 'Array':
|
values_1.push("Array(" + thing.length + ")");
|
thing.forEach(function (v, i) {
|
statements_1.push(name + "[" + i + "]=" + stringify(v));
|
});
|
break;
|
case 'Set':
|
values_1.push("new Set");
|
statements_1.push(name + "." + Array.from(thing).map(function (v) { return "add(" + stringify(v) + ")"; }).join('.'));
|
break;
|
case 'Map':
|
values_1.push("new Map");
|
statements_1.push(name + "." + Array.from(thing).map(function (_a) {
|
var k = _a[0], v = _a[1];
|
return "set(" + stringify(k) + ", " + stringify(v) + ")";
|
}).join('.'));
|
break;
|
default:
|
values_1.push(Object.getPrototypeOf(thing) === null ? 'Object.create(null)' : '{}');
|
Object.keys(thing).forEach(function (key) {
|
statements_1.push("" + name + safeProp(key) + "=" + stringify(thing[key]));
|
});
|
}
|
});
|
statements_1.push("return " + str);
|
return "(function(" + params_1.join(',') + "){" + statements_1.join(';') + "}(" + values_1.join(',') + "))";
|
}
|
else {
|
return str;
|
}
|
}
|
function getName(num) {
|
var name = '';
|
do {
|
name = chars[num % chars.length] + name;
|
num = ~~(num / chars.length) - 1;
|
} while (num >= 0);
|
return reserved.test(name) ? name + "_" : name;
|
}
|
function isPrimitive(thing) {
|
return Object(thing) !== thing;
|
}
|
function stringifyPrimitive(thing) {
|
if (typeof thing === 'string')
|
return stringifyString(thing);
|
if (thing === void 0)
|
return 'void 0';
|
if (thing === 0 && 1 / thing < 0)
|
return '-0';
|
var str = String(thing);
|
if (typeof thing === 'number')
|
return str.replace(/^(-)?0\./, '$1.');
|
return str;
|
}
|
function getType(thing) {
|
return Object.prototype.toString.call(thing).slice(8, -1);
|
}
|
function escapeUnsafeChar(c) {
|
return escaped[c] || c;
|
}
|
function escapeUnsafeChars(str) {
|
return str.replace(unsafeChars, escapeUnsafeChar);
|
}
|
function safeKey(key) {
|
return /^[_$a-zA-Z][_$a-zA-Z0-9]*$/.test(key) ? key : escapeUnsafeChars(JSON.stringify(key));
|
}
|
function safeProp(key) {
|
return /^[_$a-zA-Z][_$a-zA-Z0-9]*$/.test(key) ? "." + key : "[" + escapeUnsafeChars(JSON.stringify(key)) + "]";
|
}
|
function stringifyString(str) {
|
var result = '"';
|
for (var i = 0; i < str.length; i += 1) {
|
var char = str.charAt(i);
|
var code = char.charCodeAt(0);
|
if (char === '"') {
|
result += '\\"';
|
}
|
else if (char in escaped) {
|
result += escaped[char];
|
}
|
else if (code >= 0xd800 && code <= 0xdfff) {
|
var next = str.charCodeAt(i + 1);
|
// If this is the beginning of a [high, low] surrogate pair,
|
// add the next two characters, otherwise escape
|
if (code <= 0xdbff && (next >= 0xdc00 && next <= 0xdfff)) {
|
result += char + str[++i];
|
}
|
else {
|
result += "\\u" + code.toString(16).toUpperCase();
|
}
|
}
|
else {
|
result += char;
|
}
|
}
|
result += '"';
|
return result;
|
}
|
|
export default devalue;
|
