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

A TDS driver, for connecting to MS SQLServer databases.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.RowTokenReader = exports.ColumnValuesReader = void 0;
exports.toColumnsMap = toColumnsMap;
var _token = require("./token");
var _valueParser = require("../value-parser");
// s2.2.7.17

/**
 * Reads the column values of a row one by one. Column values - especially PLP
 * values - can be arbitrarily large, so the progress is kept across chunks.
 */
class ColumnValuesReader {
  // The reader of a PLP column value that is not complete yet.

  constructor() {
    this.columns = [];
    this.plpReader = undefined;
  }

  /**
   * Read the remaining column values. Columns flagged in the `nullBitmap`
   * have no data and are `null`.
   */
  readColumns(parser, nullBitmap) {
    const colMetadata = parser.colMetadata;
    while (this.columns.length < colMetadata.length) {
      const index = this.columns.length;
      const metadata = colMetadata[index];
      let value;
      if (nullBitmap !== undefined && nullBitmap[index >> 3] & 1 << (index & 7)) {
        value = null;
      } else if ((0, _valueParser.isPLPStream)(metadata)) {
        this.plpReader ??= new _valueParser.PLPReader(metadata);
        value = this.plpReader.read(parser);
        this.plpReader = undefined;
      } else {
        const result = (0, _valueParser.readValue)(parser.buffer, parser.position, metadata, parser.options);
        parser.position = result.offset;
        value = result.value;
      }
      this.columns.push({
        value,
        metadata
      });
    }
  }
}

/**
 * Reads a `ROW` token.
 */
exports.ColumnValuesReader = ColumnValuesReader;
class RowTokenReader extends ColumnValuesReader {
  read(parser) {
    this.readColumns(parser, undefined);
    return new _token.RowToken(parser.options.useColumnNames ? toColumnsMap(this.columns) : this.columns);
  }
}

/**
 * Map columns by name. If multiple columns share a name, the first one wins.
 */
exports.RowTokenReader = RowTokenReader;
function toColumnsMap(columns) {
  const columnsMap = Object.create(null);
  for (const column of columns) {
    const colName = column.metadata.colName;
    if (columnsMap[colName] == null) {
      columnsMap[colName] = column;
    }
  }
  return columnsMap;
}
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