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<?php

/**

 * @file

 * Contains CSV Parser.

 *

 * Functions in this file are independent of the Feeds specific implementation.

 * Thanks to jpetso http://drupal.org/user/56020 for most of the code in this

 * file.

 */

/**

 * Text lines from file iterator.

 */

class ParserCSVIterator implements Iterator {

  private $handle;

  private $currentLine;

  private $currentPos;

  public function __construct($filepath) {

    $this->handle = fopen($filepath, 'r');

    $this->currentLine = NULL;

    $this->currentPos = NULL;

  }

  function __destruct() {

    if ($this->handle) {

      fclose($this->handle);

    }

  }

  public function rewind($pos = 0) {

    if ($this->handle) {

      fseek($this->handle, $pos);

      $this->next();

    }

  }

  public function next() {

    if ($this->handle) {

      $this->currentLine = feof($this->handle) ? NULL : fgets($this->handle);

      $this->currentPos = ftell($this->handle);

      return $this->currentLine;

    }

  }

  public function valid() {

    return isset($this->currentLine);

  }

  public function current() {

    return $this->currentLine;

  }

  public function currentPos() {

    return $this->currentPos;

  }

  public function key() {

    return 'line';

  }

}

/**

 * Functionality to parse CSV files into a two dimensional array.

 */

class ParserCSV {

  private $delimiter;

  private $fromEncoding;

  private $toEncoding;

  private $skipFirstLine;

  private $columnNames;

  private $timeout;

  private $timeoutReached;

  private $startByte;

  private $lineLimit;

  private $lastLinePos;

  private $useMbString;

  public function __construct() {

    $this->delimiter = ',';

    $this->fromEncoding = 'UTF-8';

    $this->toEncoding = 'UTF-8';

    $this->skipFirstLine = FALSE;

    $this->columnNames = FALSE;

    $this->timeout = FALSE;

    $this->timeoutReached = FALSE;

    $this->startByte = 0;

    $this->lineLimit = 0;

    $this->lastLinePos = 0;

    ini_set('auto_detect_line_endings', TRUE);

    if (extension_loaded('mbstring') && variable_get('feeds_use_mbstring', TRUE)) {

      $this->useMbString = TRUE;

    }

  }

  /**

   * Set the column delimiter string.

   * By default, the comma (',') is used as delimiter.

   */

  public function setDelimiter($delimiter) {

    $this->delimiter = $delimiter;

  }

  /**

   * Sets the source file encoding.

   *

   * By default, the encoding is UTF-8.

   *

   * @param string $encoding

   *   The encoding to set.

   */

  public function setEncoding($encoding) {

    $this->fromEncoding = $encoding;

  }

  /**

   * Set this to TRUE if the parser should skip the first line of the CSV text,

   * which might be desired if the first line contains the column names.

   * By default, this is set to FALSE and the first line is not skipped.

   */

  public function setSkipFirstLine($skipFirstLine) {

    $this->skipFirstLine = $skipFirstLine;

  }

  /**

   * Specify an array of column names if you know them in advance, or FALSE

   * (which is the default) to unset any prior column names. If no column names

   * are set, the parser will put each row into a simple numerically indexed

   * array. If column names are given, the parser will create arrays with

   * these column names as array keys instead.

   */

  public function setColumnNames($columnNames) {

    $this->columnNames = $columnNames;

  }

  /**

   * Define the time (in milliseconds) after which the parser stops parsing,

   * even if it has not yet finished processing the CSV data. If the timeout

   * has been reached before parsing is done, the parse() method will return

   * an incomplete list of rows - a single row will never be cut off in the

   * middle, though. By default, no timeout (@p $timeout == FALSE) is defined.

   *

   * You can check if the timeout has been reached by calling the

   * timeoutReached() method after parse() has been called.

   */

  public function setTimeout($timeout) {

    $this->timeout = $timeout;

  }

  /**

   * After calling the parse() method, determine if the timeout (set by the

   * setTimeout() method) has been reached.

   *

   * @deprecated Use lastLinePos() instead to determine whether a file has

   *   finished parsing.

   */

  public function timeoutReached() {

    return $this->timeoutReached;

  }

  /**

   * Define the number of lines to parse in one parsing operation.

   *

   * By default, all lines of a file are being parsed.

   */

  public function setLineLimit($lines) {

    $this->lineLimit = $lines;

  }

  /**

   * Get the byte number where the parser left off after last parse() call.

   *

   * @return

   *  0 if all lines or no line has been parsed, the byte position of where a

   *  timeout or the line limit has been reached otherwise. This position can be

   *  used to set the start byte for the next iteration after parse() has

   *  reached the timeout set with setTimeout() or the line limit set with

   *  setLineLimit().

   *

   * @see ParserCSV::setStartByte()

   */

  public function lastLinePos() {

    return $this->lastLinePos;

  }

  /**

   * Set the byte where file should be started to read.

   *

   * Useful when parsing a file in batches.

   */

  public function setStartByte($start) {

    return $this->startByte = $start;

  }

  /**

   * Parse CSV files into a two dimensional array.

   *

   * @param Iterator $lineIterator

   *   An Iterator object that yields line strings, e.g. ParserCSVIterator.

   * @param $start

   *   The byte number from where to start parsing the file.

   * @param $lines

   *   The number of lines to parse, 0 for all lines.

   * @return

   *   Two dimensional array that contains the data in the CSV file.

   */

  public function parse(Iterator $lineIterator) {

    $skipLine = $this->skipFirstLine;

    $rows = array();

    $this->timeoutReached = FALSE;

    $this->lastLinePos = 0;

    $maxTime = empty($this->timeout) ? FALSE : (microtime() + $this->timeout);

    $linesParsed = 0;

    for ($lineIterator->rewind($this->startByte); $lineIterator->valid(); $lineIterator->next()) {

      // Make really sure we've got lines without trailing newlines.

      $line = trim($this->fixEncoding($lineIterator->current()), "\r\n");

      // Skip empty lines.

      if (empty($line)) {

        continue;

      }

      // If the first line contains column names, skip it.

      if ($skipLine) {

        $skipLine = FALSE;

        continue;

      }

      // The actual parser. explode() is unfortunately not suitable because the

      // delimiter might be located inside a quoted field, and that would break

      // the field and/or require additional effort to re-join the fields.

      $quoted = FALSE;

      $currentIndex = 0;

      $currentField = '';

      $fields = array();

      // We must use strlen() as we're parsing byte by byte using strpos(), so

      // drupal_strlen() will not work properly.

      while ($currentIndex <= strlen($line)) {

        if ($quoted) {

          $nextQuoteIndex = strpos($line, '"', $currentIndex);

          if ($nextQuoteIndex === FALSE) {

            // There's a line break before the quote is closed, so fetch the

            // next line and start from there.

            $currentField .= substr($line, $currentIndex);

            $lineIterator->next();

            if (!$lineIterator->valid()) {

              // Whoa, an unclosed quote! Well whatever, let's just ignore

              // that shortcoming and record it nevertheless.

              $fields[] = $currentField;

              break;

            }

            // Ok, so, on with fetching the next line, as mentioned above.

            $currentField .= "\n";

            $line = trim($this->fixEncoding($lineIterator->current()), "\r\n");

            $currentIndex = 0;

            continue;

          }

          // There's actually another quote in this line...

          // find out whether it's escaped or not.

          $currentField .= substr($line, $currentIndex, $nextQuoteIndex - $currentIndex);

          if (isset($line[$nextQuoteIndex + 1]) && $line[$nextQuoteIndex + 1] === '"') {

            // Escaped quote, add a single one to the field and proceed quoted.

            $currentField .= '"';

            $currentIndex = $nextQuoteIndex + 2;

          }

          else {

            // End of the quoted section, close the quote and let the

            // $quoted == FALSE block finalize the field.

            $quoted = FALSE;

            $currentIndex = $nextQuoteIndex + 1;

          }

        }

        else { // $quoted == FALSE

          // First, let's find out where the next character of interest is.

          $nextQuoteIndex = strpos($line, '"', $currentIndex);

          $nextDelimiterIndex = strpos($line, $this->delimiter, $currentIndex);

          if ($nextQuoteIndex === FALSE) {

            $nextIndex = $nextDelimiterIndex;

          }

          elseif ($nextDelimiterIndex === FALSE) {

            $nextIndex = $nextQuoteIndex;

          }

          else {

            $nextIndex = min($nextQuoteIndex, $nextDelimiterIndex);

          }

          if ($nextIndex === FALSE) {

            // This line is done, add the rest of it as last field.

            $currentField .= substr($line, $currentIndex);

            $fields[] = $currentField;

            break;

          }

          elseif ($line[$nextIndex] === $this->delimiter[0]) {

            $length = ($nextIndex + strlen($this->delimiter) - 1) - $currentIndex;

            $currentField .= substr($line, $currentIndex, $length);

            $fields[] = $currentField;

            $currentField = '';

            $currentIndex += $length + 1;

            // Continue with the next field.

          }

          else { // $line[$nextIndex] == '"'

            $quoted = TRUE;

            $currentField .= substr($line, $currentIndex, $nextIndex - $currentIndex);

            $currentIndex = $nextIndex + 1;

            // Continue this field in the $quoted == TRUE block.

          }

        }

      }

      // End of CSV parser. We've now got all the fields of the line as strings

      // in the $fields array.

      if (empty($this->columnNames)) {

        $row = $fields;

      }

      else {

        $row = array();

        foreach ($this->columnNames as $columnName) {

          $field = array_shift($fields);

          $row[$columnName] = isset($field) ? $field : '';

        }

      }

      $rows[] = $row;

      // Quit parsing if timeout has been reached or requested lines have been

      // reached.

      if (!empty($maxTime) && microtime() > $maxTime) {

        $this->timeoutReached = TRUE;

        $this->lastLinePos = $lineIterator->currentPos();

        break;

      }

      $linesParsed++;

      if ($this->lineLimit && $linesParsed >= $this->lineLimit) {

        $this->lastLinePos = $lineIterator->currentPos();

        break;

      }

    }

    return $rows;

  }

  /**

   * Converts encoding of input data.

   *

   * @param string $data

   *   A chunk of data.

   *

   * @return string

   *   The encoded data.

   *

   * @throws ParserCSVEncodingException

   *   Thrown when a given encoding does not match.

   */

  public function fixEncoding($data) {

    if ($this->useMbString) {

      if (mb_check_encoding($data, $this->fromEncoding)) {

        if ($this->toEncoding != $this->fromEncoding) {

          // Convert encoding. The conversion is to UTF-8 by default to prevent

          // SQL errors.

          $data = mb_convert_encoding($data, $this->toEncoding, $this->fromEncoding);

        }

      }

      else {

        throw new ParserCSVEncodingException(t('Source file is not in %encoding encoding.', array('%encoding' => $this->fromEncoding)));

      }

    }

    return $data;

  }

}

/**

 * Exception thrown when an encoding error occurs during parsing.

 */

class ParserCSVEncodingException extends Exception {}