tedious/lib/token/returnvalue-token-parser.js

A TDS driver, for connecting to MS SQLServer databases.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.ReturnValueTokenReader = void 0;
var _token = require("./token");
var _metadataParser = require("../metadata-parser");
var _valueParser = require("../value-parser");
var _helpers = require("./helpers");
// s2.2.7.16

function readHeader(buf, offset, options) {
  let paramOrdinal;
  ({
    offset,
    value: paramOrdinal
  } = (0, _helpers.readUInt16LE)(buf, offset));
  let paramName;
  ({
    offset,
    value: paramName
  } = (0, _helpers.readBVarChar)(buf, offset));
  if (paramName.charAt(0) === '@') {
    paramName = paramName.slice(1);
  }

  // status
  ({
    offset
  } = (0, _helpers.readUInt8)(buf, offset));
  let metadata;
  ({
    offset,
    value: metadata
  } = (0, _metadataParser.readMetadata)(buf, offset, options));
  return new _helpers.Result({
    paramOrdinal,
    paramName,
    metadata
  }, offset);
}

/**
 * Reads a `RETURNVALUE` token. The returned value can be an arbitrarily large
 * PLP value, so the progress is kept across chunks.
 */
class ReturnValueTokenReader {
  // The reader of a PLP value that is not complete yet.

  constructor() {
    this.header = undefined;
    this.plpReader = undefined;
  }
  read(parser) {
    if (this.header === undefined) {
      const {
        value,
        offset
      } = readHeader(parser.buffer, parser.position, parser.options);
      parser.position = offset;
      this.header = value;
    }
    const {
      paramOrdinal,
      paramName,
      metadata
    } = this.header;
    let value;
    if ((0, _valueParser.isPLPStream)(metadata)) {
      this.plpReader ??= new _valueParser.PLPReader(metadata);
      value = this.plpReader.read(parser);
    } else {
      const result = (0, _valueParser.readValue)(parser.buffer, parser.position, metadata, parser.options);
      parser.position = result.offset;
      value = result.value;
    }
    return new _token.ReturnValueToken({
      paramOrdinal,
      paramName,
      metadata,
      value
    });
  }
}
exports.ReturnValueTokenReader = ReturnValueTokenReader;
//# 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