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const {
normalizeReplacer,
normalizeSpace,
replaceValue,
getTypeNative,
getTypeAsync,
isLeadingSurrogate,
isTrailingSurrogate,
escapableCharCodeSubstitution,
type: {
PRIMITIVE,
OBJECT,
ARRAY,
PROMISE,
STRING_STREAM,
OBJECT_STREAM
}
} = require('./utils');
const charLength2048 = Array.from({ length: 2048 }).map((_, code) => {
if (escapableCharCodeSubstitution.hasOwnProperty(code)) {
return 2; // \X
}
if (code < 0x20) {
return 6; // \uXXXX
}
return code < 128 ? 1 : 2; // UTF8 bytes
});
function stringLength(str) {
let len = 0;
let prevLeadingSurrogate = false;
for (let i = 0; i < str.length; i++) {
const code = str.charCodeAt(i);
if (code < 2048) {
len += charLength2048[code];
} else if (isLeadingSurrogate(code)) {
len += 6; // \uXXXX since no pair with trailing surrogate yet
prevLeadingSurrogate = true;
continue;
} else if (isTrailingSurrogate(code)) {
len = prevLeadingSurrogate
? len - 2 // surrogate pair (4 bytes), since we calculate prev leading surrogate as 6 bytes, substruct 2 bytes
: len + 6; // \uXXXX
} else {
len += 3; // code >= 2048 is 3 bytes length for UTF8
}
prevLeadingSurrogate = false;
}
return len + 2; // +2 for quotes
}
function primitiveLength(value) {
switch (typeof value) {
case 'string':
return stringLength(value);
case 'number':
return Number.isFinite(value) ? String(value).length : 4 /* null */;
case 'boolean':
return value ? 4 /* true */ : 5 /* false */;
case 'undefined':
case 'object':
return 4; /* null */
default:
return 0;
}
}
function spaceLength(space) {
space = normalizeSpace(space);
return typeof space === 'string' ? space.length : 0;
}
module.exports = function jsonStringifyInfo(value, replacer, space, options) {
function walk(holder, key, value) {
if (stop) {
return;
}
value = replaceValue(holder, key, value, replacer);
let type = getType(value);
// check for circular structure
if (type !== PRIMITIVE && stack.has(value)) {
circular.add(value);
length += 4; // treat as null
if (!options.continueOnCircular) {
stop = true;
}
return;
}
switch (type) {
case PRIMITIVE:
if (value !== undefined || Array.isArray(holder)) {
length += primitiveLength(value);
} else if (holder === root) {
length += 9; // FIXME: that's the length of undefined, should we normalize behaviour to convert it to null?
}
break;
case OBJECT: {
if (visited.has(value)) {
duplicate.add(value);
length += visited.get(value);
break;
}
const valueLength = length;
let entries = 0;
length += 2; // {}
stack.add(value);
for (const key in value) {
if (hasOwnProperty.call(value, key) && (allowlist === null || allowlist.has(key))) {
const prevLength = length;
walk(value, key, value[key]);
if (prevLength !== length) {
// value is printed
length += stringLength(key) + 1; // "key":
entries++;
}
}
}
if (entries > 1) {
length += entries - 1; // commas
}
stack.delete(value);
if (space > 0 && entries > 0) {
length += (1 + (stack.size + 1) * space + 1) * entries; // for each key-value: \n{space}
length += 1 + stack.size * space; // for }
}
visited.set(value, length - valueLength);
break;
}
case ARRAY: {
if (visited.has(value)) {
duplicate.add(value);
length += visited.get(value);
break;
}
const valueLength = length;
length += 2; // []
stack.add(value);
for (let i = 0; i < value.length; i++) {
walk(value, i, value[i]);
}
if (value.length > 1) {
length += value.length - 1; // commas
}
stack.delete(value);
if (space > 0 && value.length > 0) {
length += (1 + (stack.size + 1) * space) * value.length; // for each element: \n{space}
length += 1 + stack.size * space; // for ]
}
visited.set(value, length - valueLength);
break;
}
case PROMISE:
case STRING_STREAM:
async.add(value);
break;
case OBJECT_STREAM:
length += 2; // []
async.add(value);
break;
}
}
let allowlist = null;
replacer = normalizeReplacer(replacer);
if (Array.isArray(replacer)) {
allowlist = new Set(replacer);
replacer = null;
}
space = spaceLength(space);
options = options || {};
const visited = new Map();
const stack = new Set();
const duplicate = new Set();
const circular = new Set();
const async = new Set();
const getType = options.async ? getTypeAsync : getTypeNative;
const root = { '': value };
let stop = false;
let length = 0;
walk(root, '', value);
return {
minLength: isNaN(length) ? Infinity : length,
circular: [...circular],
duplicate: [...duplicate],
async: [...async]
};
};