70 lines
1.9 KiB
JavaScript
70 lines
1.9 KiB
JavaScript
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'use strict';
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const Types = require('../constants/types');
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const Packet = require('../packets/packet');
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function isJSON(value) {
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return (
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Array.isArray(value) ||
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value.constructor === Object ||
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(typeof value.toJSON === 'function' && !Buffer.isBuffer(value))
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);
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}
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function toParameter(value, encoding, timezone) {
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let type = Types.VAR_STRING;
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let length;
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let writer = function (value) {
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// eslint-disable-next-line no-invalid-this
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return Packet.prototype.writeLengthCodedString.call(this, value, encoding);
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};
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if (value !== null) {
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switch (typeof value) {
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case 'undefined':
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throw new TypeError('Bind parameters must not contain undefined');
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case 'number':
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type = Types.DOUBLE;
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length = 8;
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writer = Packet.prototype.writeDouble;
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break;
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case 'boolean':
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value = value | 0;
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type = Types.TINY;
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length = 1;
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writer = Packet.prototype.writeInt8;
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break;
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case 'object':
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if (Object.prototype.toString.call(value) === '[object Date]') {
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type = Types.DATETIME;
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length = 12;
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writer = function (value) {
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// eslint-disable-next-line no-invalid-this
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return Packet.prototype.writeDate.call(this, value, timezone);
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};
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} else if (isJSON(value)) {
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value = JSON.stringify(value);
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type = Types.JSON;
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} else if (Buffer.isBuffer(value)) {
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length = Packet.lengthCodedNumberLength(value.length) + value.length;
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writer = Packet.prototype.writeLengthCodedBuffer;
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}
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break;
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default:
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value = value.toString();
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}
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} else {
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value = '';
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type = Types.NULL;
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}
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if (!length) {
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length = Packet.lengthCodedStringLength(value, encoding);
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}
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return { value, type, length, writer };
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}
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module.exports = { toParameter, isJSON };
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