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import {
DevalueError,
get_type,
is_plain_object,
is_primitive,
stringify_string
} from './utils.js';
import {
HOLE,
NAN,
NEGATIVE_INFINITY,
NEGATIVE_ZERO,
POSITIVE_INFINITY,
UNDEFINED
} from './constants.js';
/**
* Turn a value into a JSON string that can be parsed with `devalue.parse`
* @param {any} value
* @param {Record<string, (value: any) => any>} [reducers]
*/
export function stringify(value, reducers) {
/** @type {any[]} */
const stringified = [];
/** @type {Map<any, number>} */
const indexes = new Map();
/** @type {Array<{ key: string, fn: (value: any) => any }>} */
const custom = [];
for (const key in reducers) {
custom.push({ key, fn: reducers[key] });
}
/** @type {string[]} */
const keys = [];
let p = 0;
/** @param {any} thing */
function flatten(thing) {
if (typeof thing === 'function') {
throw new DevalueError(`Cannot stringify a function`, keys);
}
if (indexes.has(thing)) return indexes.get(thing);
if (thing === undefined) return UNDEFINED;
if (Number.isNaN(thing)) return NAN;
if (thing === Infinity) return POSITIVE_INFINITY;
if (thing === -Infinity) return NEGATIVE_INFINITY;
if (thing === 0 && 1 / thing < 0) return NEGATIVE_ZERO;
const index = p++;
indexes.set(thing, index);
for (const { key, fn } of custom) {
const value = fn(thing);
if (value) {
stringified[index] = `["${key}",${flatten(value)}]`;
return index;
}
}
let str = '';
if (is_primitive(thing)) {
str = stringify_primitive(thing);
} else {
const type = get_type(thing);
switch (type) {
case 'Number':
case 'String':
case 'Boolean':
str = `["Object",${stringify_primitive(thing)}]`;
break;
case 'BigInt':
str = `["BigInt",${thing}]`;
break;
case 'Date':
str = `["Date","${thing.toISOString()}"]`;
break;
case 'RegExp':
const { source, flags } = thing;
str = flags
? `["RegExp",${stringify_string(source)},"${flags}"]`
: `["RegExp",${stringify_string(source)}]`;
break;
case 'Array':
str = '[';
for (let i = 0; i < thing.length; i += 1) {
if (i > 0) str += ',';
if (i in thing) {
keys.push(`[${i}]`);
str += flatten(thing[i]);
keys.pop();
} else {
str += HOLE;
}
}
str += ']';
break;
case 'Set':
str = '["Set"';
for (const value of thing) {
str += `,${flatten(value)}`;
}
str += ']';
break;
case 'Map':
str = '["Map"';
for (const [key, value] of thing) {
keys.push(
`.get(${is_primitive(key) ? stringify_primitive(key) : '...'})`
);
str += `,${flatten(key)},${flatten(value)}`;
}
str += ']';
break;
default:
if (!is_plain_object(thing)) {
throw new DevalueError(
`Cannot stringify arbitrary non-POJOs`,
keys
);
}
if (Object.getOwnPropertySymbols(thing).length > 0) {
throw new DevalueError(
`Cannot stringify POJOs with symbolic keys`,
keys
);
}
if (Object.getPrototypeOf(thing) === null) {
str = '["null"';
for (const key in thing) {
keys.push(`.${key}`);
str += `,${stringify_string(key)},${flatten(thing[key])}`;
keys.pop();
}
str += ']';
} else {
str = '{';
let started = false;
for (const key in thing) {
if (started) str += ',';
started = true;
keys.push(`.${key}`);
str += `${stringify_string(key)}:${flatten(thing[key])}`;
keys.pop();
}
str += '}';
}
}
}
stringified[index] = str;
return index;
}
const index = flatten(value);
// special case — value is represented as a negative index
if (index < 0) return `${index}`;
return `[${stringified.join(',')}]`;
}
/**
* @param {any} thing
* @returns {string}
*/
function stringify_primitive(thing) {
const type = typeof thing;
if (type === 'string') return stringify_string(thing);
if (thing instanceof String) return stringify_string(thing.toString());
if (thing === void 0) return UNDEFINED.toString();
if (thing === 0 && 1 / thing < 0) return NEGATIVE_ZERO.toString();
if (type === 'bigint') return `["BigInt","${thing}"]`;
return String(thing);
}
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