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330 lines
9.2 KiB
330 lines
9.2 KiB
'use strict';
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Object.defineProperty(exports, '__esModule', { value: true });
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/*
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control character types:
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1 - metadata
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2 - symbols
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6 - false
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7 - true
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8- 16 - negative doubles
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16-24 positive doubles
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27 - String starts with a character 27 or less or is an empty string
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0 - multipart separator
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> 27 normal string characters
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*/
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/*
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* Convert arbitrary scalar values to buffer bytes with type preservation and type-appropriate ordering
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*/
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const float64Array = new Float64Array(2);
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const int32Array = new Int32Array(float64Array.buffer, 0, 4);
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let nullTerminate = false;
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/*
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* Convert arbitrary scalar values to buffer bytes with type preservation and type-appropriate ordering
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*/
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function writeKey(key, target, position, inSequence) {
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let targetView = target.dataView;
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if (!targetView)
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targetView = target.dataView = new DataView(target.buffer, target.byteOffset, ((target.byteLength + 3) >> 2) << 2);
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switch (typeof key) {
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case 'string':
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let strLength = key.length;
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let c1 = key.charCodeAt(0);
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if (c1 < 28) // escape character
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target[position++] = 27;
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if (strLength < 0x20) {
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let i, c2;
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for (i = 0; i < strLength; i++) {
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c1 = key.charCodeAt(i);
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if (c1 < 0x80) {
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target[position++] = c1;
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} else if (c1 < 0x800) {
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target[position++] = c1 >> 6 | 0xc0;
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target[position++] = c1 & 0x3f | 0x80;
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} else if (
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(c1 & 0xfc00) === 0xd800 &&
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((c2 = key.charCodeAt(i + 1)) & 0xfc00) === 0xdc00
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) {
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c1 = 0x10000 + ((c1 & 0x03ff) << 10) + (c2 & 0x03ff);
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i++;
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target[position++] = c1 >> 18 | 0xf0;
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target[position++] = c1 >> 12 & 0x3f | 0x80;
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target[position++] = c1 >> 6 & 0x3f | 0x80;
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target[position++] = c1 & 0x3f | 0x80;
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} else {
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target[position++] = c1 >> 12 | 0xe0;
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target[position++] = c1 >> 6 & 0x3f | 0x80;
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target[position++] = c1 & 0x3f | 0x80;
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}
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}
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} else {
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position += target.utf8Write(key, position, 2000);
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}
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break
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case 'number':
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float64Array[0] = key;
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let lowInt = int32Array[0];
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let highInt = int32Array[1];
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let length;
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if (key < 0) {
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targetView.setInt32(position + 4, ~((lowInt >>> 4) | (highInt << 28)));
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targetView.setInt32(position + 0, (highInt ^ 0x7fffffff) >>> 4);
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targetView.setInt32(position + 8, ((lowInt & 0xf) ^ 0xf) << 4, true); // just always do the null termination here
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return position + 9
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} else if ((lowInt & 0xf) || inSequence) {
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length = 9;
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} else if (lowInt & 0xfffff)
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length = 8;
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else if (lowInt || (highInt & 0xf))
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length = 6;
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else
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length = 4;
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// switching order to go to little endian
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targetView.setInt32(position + 0, (highInt >>> 4) | 0x10000000);
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targetView.setInt32(position + 4, (lowInt >>> 4) | (highInt << 28));
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// if (length == 9 || nullTerminate)
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targetView.setInt32(position + 8, (lowInt & 0xf) << 4, true);
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return position + length;
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case 'object':
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if (key) {
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if (key instanceof Array) {
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for (let i = 0, l = key.length; i < l; i++) {
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if (i > 0)
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target[position++] = 0;
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position = writeKey(key[i], target, position, true);
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}
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break
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} else if (key instanceof Uint8Array) {
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target.set(key, position);
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position += key.length;
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break
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} else {
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throw new Error('Unable to serialize object as a key')
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}
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} else // null
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target[position++] = 0;
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break
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case 'boolean':
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targetView.setUint32(position++, key ? 7 : 6, true);
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return position
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case 'bigint':
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return writeKey(Number(key), target, position, inSequence)
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case 'undefined':
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return position
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// undefined is interpreted as the absence of a key, signified by zero length
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case 'symbol':
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target[position++] = 2;
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return writeKey(key.description, target, position, inSequence)
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default:
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throw new Error('Can not serialize key of type ' + typeof key)
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}
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if (nullTerminate && !inSequence)
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targetView.setUint32(position, 0);
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return position
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}
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let position;
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function readKey(buffer, start, end, inSequence) {
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buffer[end] = 0; // make sure it is null terminated
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position = start;
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let controlByte = buffer[position];
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let value;
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if (controlByte < 24) {
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if (controlByte < 8) {
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position++;
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if (controlByte == 6) {
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value = false;
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} else if (controlByte == 7) {
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value = true;
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} else if (controlByte == 0) {
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value = null;
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} else if (controlByte == 2) {
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value = Symbol.for(readString(buffer));
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} else
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return Uint8Array.prototype.slice.call(buffer, start, end)
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} else {
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let dataView = buffer.dataView || (buffer.dataView = new DataView(buffer.buffer, buffer.byteOffset, ((buffer.byteLength + 3) >> 2) << 2));
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let highInt = dataView.getInt32(position) << 4;
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let size = end - position;
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let lowInt;
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if (size > 4) {
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lowInt = dataView.getInt32(position + 4);
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highInt |= lowInt >>> 28;
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if (size <= 6) { // clear the last bits
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lowInt &= -0x1000;
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}
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lowInt = lowInt << 4;
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if (size > 8) {
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lowInt = lowInt | buffer[position + 8] >> 4;
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}
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} else
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lowInt = 0;
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if (controlByte < 16) {
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// negative gets negated
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highInt = highInt ^ 0x7fffffff;
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lowInt = ~lowInt;
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}
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int32Array[1] = highInt;
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int32Array[0] = lowInt;
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value = float64Array[0];
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position += 9;
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}
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} else {
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if (controlByte == 27) {
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position++;
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}
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value = readString(buffer);
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/*let strStart = position
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let strEnd = end
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for (; position < end; position++) {
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if (buffer[position] == 0) {
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break
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}
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}
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value = buffer.toString('utf8', strStart, position++)*/
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}
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while (position < end) {
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if (buffer[position] === 0)
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position++;
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if (inSequence) {
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encoder.position = position;
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return value
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}
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let nextValue = readKey(buffer, position, end, true);
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if (value instanceof Array) {
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value.push(nextValue);
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} else
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value = [ value, nextValue ];
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}
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return value
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}
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const encoder = {
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writeKey,
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readKey,
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};
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const toBufferKey = (key) => {
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let buffer = Buffer.alloc(2048);
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return buffer.slice(0, writeKey(key, buffer, 0, 2048) + 1)
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};
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const fromBufferKey = (sourceBuffer) => {
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return readKey(sourceBuffer, 0, sourceBuffer.length - 1)
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};
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const fromCharCode = String.fromCharCode;
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function makeStringBuilder() {
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let stringBuildCode = '(source) => {';
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let previous = [];
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for (let i = 0; i < 0x30; i++) {
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let v = fromCharCode((i & 0xf) + 97) + fromCharCode((i >> 4) + 97);
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stringBuildCode += `
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let ${v} = source[position++]
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if (${v} === 0)
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return fromCharCode(${previous})
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else if (${v} >= 0x80)
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${v} = finishUtf8(${v}, source)
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`;
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previous.push(v);
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if (i == 1000000) // this just exists to prevent rollup from doing dead code elimination on finishUtf8
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finishUtf8();
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}
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stringBuildCode += `return fromCharCode(${previous}) + readString(source)}`;
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return stringBuildCode
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}
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let pendingSurrogate;
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function finishUtf8(byte1, src) {
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if ((byte1 & 0xe0) === 0xc0) {
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// 2 bytes
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const byte2 = src[position++] & 0x3f;
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return ((byte1 & 0x1f) << 6) | byte2
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} else if ((byte1 & 0xf0) === 0xe0) {
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// 3 bytes
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const byte2 = src[position++] & 0x3f;
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const byte3 = src[position++] & 0x3f;
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return ((byte1 & 0x1f) << 12) | (byte2 << 6) | byte3
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} else if ((byte1 & 0xf8) === 0xf0) {
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// 4 bytes
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if (pendingSurrogate) {
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byte1 = pendingSurrogate;
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pendingSurrogate = null;
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position += 3;
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return byte1
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}
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const byte2 = src[position++] & 0x3f;
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const byte3 = src[position++] & 0x3f;
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const byte4 = src[position++] & 0x3f;
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let unit = ((byte1 & 0x07) << 0x12) | (byte2 << 0x0c) | (byte3 << 0x06) | byte4;
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if (unit > 0xffff) {
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unit -= 0x10000;
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unit = 0xdc00 | (unit & 0x3ff);
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pendingSurrogate = ((unit >>> 10) & 0x3ff) | 0xd800;
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position -= 4; // reset so we can return the next part of the surrogate pair
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}
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return unit
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} else {
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return byte1
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}
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}
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const enableNullTermination = () => nullTerminate = true;
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const readString = eval(makeStringBuilder());
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function compareKeys(a, b) {
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// compare with type consistency that matches ordered-binary
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if (typeof a == 'object') {
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if (!a) {
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return b == null ? 0 : -1
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}
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if (a.compare) {
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if (b == null) {
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return 1
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} else if (b.compare) {
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return a.compare(b)
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} else {
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return -1
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}
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}
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let arrayComparison;
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if (b instanceof Array) {
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let i = 0;
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while((arrayComparison = compareKeys(a[i], b[i])) == 0 && i <= a.length) {
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i++;
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}
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return arrayComparison
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}
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arrayComparison = compareKeys(a[0], b);
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if (arrayComparison == 0 && a.length > 1)
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return 1
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return arrayComparison
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} else if (typeof a == typeof b) {
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if (typeof a === 'symbol') {
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a = Symbol.keyFor(a);
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b = Symbol.keyFor(b);
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}
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return a < b ? -1 : a === b ? 0 : 1
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}
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else if (typeof b == 'object') {
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if (b instanceof Array)
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return -compareKeys(b, a)
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return 1
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} else {
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return typeOrder[typeof a] < typeOrder[typeof b] ? -1 : 1
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}
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}
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const typeOrder = {
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symbol: 0,
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undefined: 1,
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boolean: 2,
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number: 3,
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string: 4
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};
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exports.compareKeys = compareKeys;
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exports.enableNullTermination = enableNullTermination;
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exports.encoder = encoder;
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exports.fromBufferKey = fromBufferKey;
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exports.readKey = readKey;
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exports.toBufferKey = toBufferKey;
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exports.writeKey = writeKey;
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