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import {
DevalueError,
enumerable_symbols,
escaped,
get_type,
is_plain_object,
is_primitive,
stringify_key,
stringify_string
} from './utils.js';
const chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_$';
const unsafe_chars = /[<\b\f\n\r\t\0\u2028\u2029]/g;
const reserved =
/^(?:do|if|in|for|int|let|new|try|var|byte|case|char|else|enum|goto|long|this|void|with|await|break|catch|class|const|final|float|short|super|throw|while|yield|delete|double|export|import|native|return|switch|throws|typeof|boolean|default|extends|finally|package|private|abstract|continue|debugger|function|volatile|interface|protected|transient|implements|instanceof|synchronized)$/;
/**
* Turn a value into the JavaScript that creates an equivalent value
* @param {any} value
* @param {(value: any, uneval: (value: any) => string) => string | void} [replacer]
*/
export function uneval(value, replacer) {
const counts = new Map();
/** @type {string[]} */
const keys = [];
const custom = new Map();
/** @param {any} thing */
function walk(thing) {
if (!is_primitive(thing)) {
if (counts.has(thing)) {
counts.set(thing, counts.get(thing) + 1);
return;
}
counts.set(thing, 1);
if (replacer) {
const str = replacer(thing, (value) => uneval(value, replacer));
if (typeof str === 'string') {
custom.set(thing, str);
return;
}
}
if (typeof thing === 'function') {
throw new DevalueError(`Cannot stringify a function`, keys);
}
const type = get_type(thing);
switch (type) {
case 'Number':
case 'BigInt':
case 'String':
case 'Boolean':
case 'Date':
case 'RegExp':
case 'URL':
case 'URLSearchParams':
return;
case 'Array':
/** @type {any[]} */ (thing).forEach((value, i) => {
keys.push(`[${i}]`);
walk(value);
keys.pop();
});
break;
case 'Set':
Array.from(thing).forEach(walk);
break;
case 'Map':
for (const [key, value] of thing) {
keys.push(
`.get(${is_primitive(key) ? stringify_primitive(key) : '...'})`
);
walk(value);
keys.pop();
}
break;
case 'Int8Array':
case 'Uint8Array':
case 'Uint8ClampedArray':
case 'Int16Array':
case 'Uint16Array':
case 'Int32Array':
case 'Uint32Array':
case 'Float32Array':
case 'Float64Array':
case 'BigInt64Array':
case 'BigUint64Array':
walk(thing.buffer);
return;
case 'ArrayBuffer':
return;
case 'Temporal.Duration':
case 'Temporal.Instant':
case 'Temporal.PlainDate':
case 'Temporal.PlainTime':
case 'Temporal.PlainDateTime':
case 'Temporal.PlainMonthDay':
case 'Temporal.PlainYearMonth':
case 'Temporal.ZonedDateTime':
return;
default:
if (!is_plain_object(thing)) {
throw new DevalueError(
`Cannot stringify arbitrary non-POJOs`,
keys
);
}
if (enumerable_symbols(thing).length > 0) {
throw new DevalueError(
`Cannot stringify POJOs with symbolic keys`,
keys
);
}
for (const key in thing) {
keys.push(stringify_key(key));
walk(thing[key]);
keys.pop();
}
}
}
}
walk(value);
const names = new Map();
Array.from(counts)
.filter((entry) => entry[1] > 1)
.sort((a, b) => b[1] - a[1])
.forEach((entry, i) => {
names.set(entry[0], get_name(i));
});
/**
* @param {any} thing
* @returns {string}
*/
function stringify(thing) {
if (names.has(thing)) {
return names.get(thing);
}
if (is_primitive(thing)) {
return stringify_primitive(thing);
}
if (custom.has(thing)) {
return custom.get(thing);
}
const type = get_type(thing);
switch (type) {
case 'Number':
case 'String':
case 'Boolean':
return `Object(${stringify(thing.valueOf())})`;
case 'RegExp':
return `new RegExp(${stringify_string(thing.source)}, "${
thing.flags
}")`;
case 'Date':
return `new Date(${thing.getTime()})`;
case 'URL':
return `new URL(${stringify_string(thing.toString())})`;
case 'URLSearchParams':
return `new URLSearchParams(${stringify_string(thing.toString())})`;
case 'Array':
const members = /** @type {any[]} */ (thing).map((v, i) =>
i in thing ? stringify(v) : ''
);
const 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(',')}])`;
case 'Int8Array':
case 'Uint8Array':
case 'Uint8ClampedArray':
case 'Int16Array':
case 'Uint16Array':
case 'Int32Array':
case 'Uint32Array':
case 'Float32Array':
case 'Float64Array':
case 'BigInt64Array':
case 'BigUint64Array': {
let str = `new ${type}`;
if (counts.get(thing.buffer) === 1) {
const array = new thing.constructor(thing.buffer);
str += `([${array}])`;
} else {
str += `([${stringify(thing.buffer)}])`;
}
const a = thing.byteOffset;
const b = a + thing.byteLength;
// handle subarrays
if (a > 0 || b !== thing.buffer.byteLength) {
const m = +/(\d+)/.exec(type)[1] / 8;
str += `.subarray(${a / m},${b / m})`;
}
return str;
}
case 'ArrayBuffer': {
const ui8 = new Uint8Array(thing);
return `new Uint8Array([${ui8.toString()}]).buffer`;
}
case 'Temporal.Duration':
case 'Temporal.Instant':
case 'Temporal.PlainDate':
case 'Temporal.PlainTime':
case 'Temporal.PlainDateTime':
case 'Temporal.PlainMonthDay':
case 'Temporal.PlainYearMonth':
case 'Temporal.ZonedDateTime':
return `${type}.from(${stringify_string(thing.toString())})`;
default:
const keys = Object.keys(thing);
const obj = keys
.map((key) => `${safe_key(key)}:${stringify(thing[key])}`)
.join(',');
const proto = Object.getPrototypeOf(thing);
if (proto === null) {
return keys.length > 0
? `{${obj},__proto__:null}`
: `{__proto__:null}`;
}
return `{${obj}}`;
}
}
const str = stringify(value);
if (names.size) {
/** @type {string[]} */
const params = [];
/** @type {string[]} */
const statements = [];
/** @type {string[]} */
const values = [];
names.forEach((name, thing) => {
params.push(name);
if (custom.has(thing)) {
values.push(/** @type {string} */ (custom.get(thing)));
return;
}
if (is_primitive(thing)) {
values.push(stringify_primitive(thing));
return;
}
const type = get_type(thing);
switch (type) {
case 'Number':
case 'String':
case 'Boolean':
values.push(`Object(${stringify(thing.valueOf())})`);
break;
case 'RegExp':
values.push(thing.toString());
break;
case 'Date':
values.push(`new Date(${thing.getTime()})`);
break;
case 'Array':
values.push(`Array(${thing.length})`);
/** @type {any[]} */ (thing).forEach((v, i) => {
statements.push(`${name}[${i}]=${stringify(v)}`);
});
break;
case 'Set':
values.push(`new Set`);
statements.push(
`${name}.${Array.from(thing)
.map((v) => `add(${stringify(v)})`)
.join('.')}`
);
break;
case 'Map':
values.push(`new Map`);
statements.push(
`${name}.${Array.from(thing)
.map(([k, v]) => `set(${stringify(k)}, ${stringify(v)})`)
.join('.')}`
);
break;
case 'ArrayBuffer':
values.push(
`new Uint8Array([${new Uint8Array(thing).join(',')}]).buffer`
);
break;
default:
values.push(
Object.getPrototypeOf(thing) === null ? 'Object.create(null)' : '{}'
);
Object.keys(thing).forEach((key) => {
statements.push(
`${name}${safe_prop(key)}=${stringify(thing[key])}`
);
});
}
});
statements.push(`return ${str}`);
return `(function(${params.join(',')}){${statements.join(
';'
)}}(${values.join(',')}))`;
} else {
return str;
}
}
/** @param {number} num */
function get_name(num) {
let name = '';
do {
name = chars[num % chars.length] + name;
num = ~~(num / chars.length) - 1;
} while (num >= 0);
return reserved.test(name) ? `${name}0` : name;
}
/** @param {string} c */
function escape_unsafe_char(c) {
return escaped[c] || c;
}
/** @param {string} str */
function escape_unsafe_chars(str) {
return str.replace(unsafe_chars, escape_unsafe_char);
}
/** @param {string} key */
function safe_key(key) {
return /^[_$a-zA-Z][_$a-zA-Z0-9]*$/.test(key)
? key
: escape_unsafe_chars(JSON.stringify(key));
}
/** @param {string} key */
function safe_prop(key) {
return /^[_$a-zA-Z][_$a-zA-Z0-9]*$/.test(key)
? `.${key}`
: `[${escape_unsafe_chars(JSON.stringify(key))}]`;
}
/** @param {any} thing */
function stringify_primitive(thing) {
if (typeof thing === 'string') return stringify_string(thing);
if (thing === void 0) return 'void 0';
if (thing === 0 && 1 / thing < 0) return '-0';
const str = String(thing);
if (typeof thing === 'number') return str.replace(/^(-)?0\./, '$1.');
if (typeof thing === 'bigint') return thing + 'n';
return str;
}
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