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'use strict';
Object.defineProperty(exports, '__esModule', { value: true });
/*
control character types:
1 - metadata
2 - symbols
6 - false
7 - true
8- 16 - negative doubles
16-24 positive doubles
27 - String starts with a character 27 or less or is an empty string
0 - multipart separator
> 27 normal string characters
*/
/*
* Convert arbitrary scalar values to buffer bytes with type preservation and type-appropriate ordering
*/
const float64Array = new Float64Array(2);
const int32Array = new Int32Array(float64Array.buffer, 0, 4);
new Uint8Array(float64Array.buffer, 2, 6);
new Uint8Array(float64Array.buffer, 0, 8);
let nullTerminate = false;
let textEncoder;
try {
textEncoder = new TextEncoder();
} catch (error) {}
/*
* Convert arbitrary scalar values to buffer bytes with type preservation and type-appropriate ordering
*/
function writeKey(key, target, position, inSequence) {
let targetView = target.dataView;
if (!targetView)
targetView = target.dataView = new DataView(target.buffer, target.byteOffset, ((target.byteLength + 3) >> 2) << 2);
switch (typeof key) {
case 'string':
let strLength = key.length;
let c1 = key.charCodeAt(0);
if (!(c1 >= 28)) // escape character
target[position++] = 27;
if (strLength < 0x40) {
let i, c2;
for (i = 0; i < strLength; i++) {
c1 = key.charCodeAt(i);
if (c1 < 0x80) {
target[position++] = c1;
} else if (c1 < 0x800) {
target[position++] = c1 >> 6 | 0xc0;
target[position++] = c1 & 0x3f | 0x80;
} else if (
(c1 & 0xfc00) === 0xd800 &&
((c2 = key.charCodeAt(i + 1)) & 0xfc00) === 0xdc00
) {
c1 = 0x10000 + ((c1 & 0x03ff) << 10) + (c2 & 0x03ff);
i++;
target[position++] = c1 >> 18 | 0xf0;
target[position++] = c1 >> 12 & 0x3f | 0x80;
target[position++] = c1 >> 6 & 0x3f | 0x80;
target[position++] = c1 & 0x3f | 0x80;
} else {
target[position++] = c1 >> 12 | 0xe0;
target[position++] = c1 >> 6 & 0x3f | 0x80;
target[position++] = c1 & 0x3f | 0x80;
}
}
} else {
if (target.utf8Write)
position += target.utf8Write(key, position);
else
position += textEncoder.encodeInto(key, target.subarray(position)).written;
if (position > target.length - 4)
throw new RangeError('String does not fit in target buffer')
}
break
case 'number':
float64Array[0] = key;
let lowInt = int32Array[0];
let highInt = int32Array[1];
let length;
if (key < 0) {
targetView.setInt32(position + 4, ~((lowInt >>> 4) | (highInt << 28)));
targetView.setInt32(position + 0, (highInt ^ 0x7fffffff) >>> 4);
targetView.setInt32(position + 8, ((lowInt & 0xf) ^ 0xf) << 4, true); // just always do the null termination here
return position + 9
} else if ((lowInt & 0xf) || inSequence) {
length = 9;
} else if (lowInt & 0xfffff)
length = 8;
else if (lowInt || (highInt & 0xf))
length = 6;
else
length = 4;
// switching order to go to little endian
targetView.setInt32(position + 0, (highInt >>> 4) | 0x10000000);
targetView.setInt32(position + 4, (lowInt >>> 4) | (highInt << 28));
// if (length == 9 || nullTerminate)
targetView.setInt32(position + 8, (lowInt & 0xf) << 4, true);
return position + length;
case 'object':
if (key) {
if (key instanceof Array) {
for (let i = 0, l = key.length; i < l; i++) {
if (i > 0)
target[position++] = 0;
position = writeKey(key[i], target, position, true);
}
break
} else if (key instanceof Uint8Array) {
target.set(key, position);
position += key.length;
break
} else {
throw new Error('Unable to serialize object as a key')
}
} else // null
target[position++] = 0;
break
case 'boolean':
targetView.setUint32(position++, key ? 7 : 6, true);
return position
case 'bigint':
return writeKey(Number(key), target, position, inSequence)
case 'undefined':
return position
// undefined is interpreted as the absence of a key, signified by zero length
case 'symbol':
target[position++] = 2;
return writeKey(key.description, target, position, inSequence)
default:
throw new Error('Can not serialize key of type ' + typeof key)
}
if (nullTerminate && !inSequence)
targetView.setUint32(position, 0);
return position
}
let position;
function readKey(buffer, start, end, inSequence) {
buffer[end] = 0; // make sure it is null terminated
position = start;
let controlByte = buffer[position];
let value;
if (controlByte < 24) {
if (controlByte < 8) {
position++;
if (controlByte == 6) {
value = false;
} else if (controlByte == 7) {
value = true;
} else if (controlByte == 0) {
value = null;
} else if (controlByte == 2) {
value = Symbol.for(readString(buffer));
} else
return Uint8Array.prototype.slice.call(buffer, start, end)
} else {
let dataView = buffer.dataView || (buffer.dataView = new DataView(buffer.buffer, buffer.byteOffset, ((buffer.byteLength + 3) >> 2) << 2));
let highInt = dataView.getInt32(position) << 4;
let size = end - position;
let lowInt;
if (size > 4) {
lowInt = dataView.getInt32(position + 4);
highInt |= lowInt >>> 28;
if (size <= 6) { // clear the last bits
lowInt &= -0x1000;
}
lowInt = lowInt << 4;
if (size > 8) {
lowInt = lowInt | buffer[position + 8] >> 4;
}
} else
lowInt = 0;
if (controlByte < 16) {
// negative gets negated
highInt = highInt ^ 0x7fffffff;
lowInt = ~lowInt;
}
int32Array[1] = highInt;
int32Array[0] = lowInt;
value = float64Array[0];
position += 9;
}
} else {
if (controlByte == 27) {
position++;
}
value = readString(buffer);
/*let strStart = position
let strEnd = end
for (; position < end; position++) {
if (buffer[position] == 0) {
break
}
}
value = buffer.toString('utf8', strStart, position++)*/
}
while (position < end) {
if (buffer[position] === 0)
position++;
if (inSequence) {
encoder.position = position;
return value
}
let nextValue = readKey(buffer, position, end, true);
if (value instanceof Array) {
value.push(nextValue);
} else
value = [ value, nextValue ];
}
return value
}
const enableNullTermination = () => nullTerminate = true;
const encoder = {
writeKey,
readKey,
enableNullTermination,
};
const toBufferKey = (key) => {
let buffer = Buffer.alloc(2048);
return buffer.slice(0, writeKey(key, buffer, 0, 2048) + 1)
};
const fromBufferKey = (sourceBuffer) => {
return readKey(sourceBuffer, 0, sourceBuffer.length - 1)
};
const fromCharCode = String.fromCharCode;
function makeStringBuilder() {
let stringBuildCode = '(source) => {';
let previous = [];
for (let i = 0; i < 0x30; i++) {
let v = fromCharCode((i & 0xf) + 97) + fromCharCode((i >> 4) + 97);
stringBuildCode += `
let ${v} = source[position++]
if (${v} === 0)
return fromCharCode(${previous})
else if (${v} >= 0x80)
${v} = finishUtf8(${v}, source)
`;
previous.push(v);
if (i == 1000000) // this just exists to prevent rollup from doing dead code elimination on finishUtf8
finishUtf8();
}
stringBuildCode += `return fromCharCode(${previous}) + readString(source)}`;
return stringBuildCode
}
let pendingSurrogate;
function finishUtf8(byte1, src) {
if ((byte1 & 0xe0) === 0xc0) {
// 2 bytes
const byte2 = src[position++] & 0x3f;
return ((byte1 & 0x1f) << 6) | byte2
} else if ((byte1 & 0xf0) === 0xe0) {
// 3 bytes
const byte2 = src[position++] & 0x3f;
const byte3 = src[position++] & 0x3f;
return ((byte1 & 0x1f) << 12) | (byte2 << 6) | byte3
} else if ((byte1 & 0xf8) === 0xf0) {
// 4 bytes
if (pendingSurrogate) {
byte1 = pendingSurrogate;
pendingSurrogate = null;
position += 3;
return byte1
}
const byte2 = src[position++] & 0x3f;
const byte3 = src[position++] & 0x3f;
const byte4 = src[position++] & 0x3f;
let unit = ((byte1 & 0x07) << 0x12) | (byte2 << 0x0c) | (byte3 << 0x06) | byte4;
if (unit > 0xffff) {
unit -= 0x10000;
unit = 0xdc00 | (unit & 0x3ff);
pendingSurrogate = ((unit >>> 10) & 0x3ff) | 0xd800;
position -= 4; // reset so we can return the next part of the surrogate pair
}
return unit
} else {
return byte1
}
}
const readString = eval(makeStringBuilder());
function compareKeys(a, b) {
// compare with type consistency that matches binary comparison
if (typeof a == 'object') {
if (!a) {
return b == null ? 0 : -1
}
if (a.compare) {
if (b == null) {
return 1
} else if (b.compare) {
return a.compare(b)
} else {
return -1
}
}
let arrayComparison;
if (b instanceof Array) {
let i = 0;
while((arrayComparison = compareKeys(a[i], b[i])) == 0 && i <= a.length) {
i++;
}
return arrayComparison
}
arrayComparison = compareKeys(a[0], b);
if (arrayComparison == 0 && a.length > 1)
return 1
return arrayComparison
} else if (typeof a == typeof b) {
if (typeof a === 'symbol') {
a = Symbol.keyFor(a);
b = Symbol.keyFor(b);
}
return a < b ? -1 : a === b ? 0 : 1
}
else if (typeof b == 'object') {
if (b instanceof Array)
return -compareKeys(b, a)
return 1
} else {
return typeOrder[typeof a] < typeOrder[typeof b] ? -1 : 1
}
}
const typeOrder = {
symbol: 0,
undefined: 1,
boolean: 2,
number: 3,
string: 4
};
const MINIMUM_KEY = null;
const MAXIMUM_KEY = new Uint8Array([0xff]);
exports.MAXIMUM_KEY = MAXIMUM_KEY;
exports.MINIMUM_KEY = MINIMUM_KEY;
exports.compareKeys = compareKeys;
exports.enableNullTermination = enableNullTermination;
exports.encoder = encoder;
exports.fromBufferKey = fromBufferKey;
exports.readKey = readKey;
exports.toBufferKey = toBufferKey;
exports.writeKey = writeKey;