<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
 * CSV import plugin for phpMyAdmin
 *
 * @todo    add an option for handling NULL values
 * @version $Id: csv.php 12600 2009-06-27 11:41:51Z lem9 $
 * @package phpMyAdmin-Import
 */
if (! defined('PHPMYADMIN')) {
    exit;
}

/**
 *
 */
if ($plugin_param !== 'table') {
    return;
}

if (isset($plugin_list)) {
    $plugin_list['csv'] = array(
        'text' => 'strCSV',
        'extension' => 'csv',
        'options' => array(
            array('type' => 'bool', 'name' => 'replace', 'text' => 'strReplaceTable'),
            array('type' => 'bool', 'name' => 'ignore', 'text' => 'strIgnoreDuplicates'),
            array('type' => 'text', 'name' => 'terminated', 'text' => 'strFieldsTerminatedBy', 'size' => 2, 'len' => 2),
            array('type' => 'text', 'name' => 'enclosed', 'text' => 'strFieldsEnclosedBy', 'size' => 2, 'len' => 2),
            array('type' => 'text', 'name' => 'escaped', 'text' => 'strFieldsEscapedBy', 'size' => 2, 'len' => 2),
            array('type' => 'text', 'name' => 'new_line', 'text' => 'strLinesTerminatedBy', 'size' => 2),
            array('type' => 'text', 'name' => 'columns', 'text' => 'strColumnNames'),
            ),
        'options_text' => 'strOptions',
        );
    /* We do not define function when plugin is just queried for information above */
    return;
}

$replacements = array(
    '\\n'   => "\n",
    '\\t'   => "\t",
    '\\r'   => "\r",
    );
$csv_terminated = strtr($csv_terminated, $replacements);
$csv_enclosed = strtr($csv_enclosed,  $replacements);
$csv_escaped = strtr($csv_escaped, $replacements);
$csv_new_line = strtr($csv_new_line, $replacements);

if (strlen($csv_terminated) != 1) {
    $message = PMA_Message::error('strInvalidCSVParameter');
    $message->addParam('strFieldsTerminatedBy', false);
    $error = TRUE;
    // The default dialog of MS Excel when generating a CSV produces a
    // semi-colon-separated file with no chance of specifying the
    // enclosing character. Thus, users who want to import this file
    // tend to remove the enclosing character on the Import dialog.
    // I could not find a test case where having no enclosing characters
    // confuses this script.
    // But the parser won't work correctly with strings so we allow just
    // one character.
} elseif (strlen($csv_enclosed) > 1) {
    $message = PMA_Message::error('strInvalidCSVParameter');
    $message->addParam('strFieldsEnclosedBy', false);
    $error = TRUE;
} elseif (strlen($csv_escaped) != 1) {
    $message = PMA_Message::error('strInvalidCSVParameter');
    $message->addParam('strFieldsEscapedBy', false);
    $error = TRUE;
} elseif (strlen($csv_new_line) != 1 && $csv_new_line != 'auto') {
    $message = PMA_Message::error('strInvalidCSVParameter');
    $message->addParam('strLinesTerminatedBy', false);
    $error = TRUE;
}

$buffer = '';
if (isset($csv_replace)) {
    $sql_template = 'REPLACE';
} else {
    $sql_template = 'INSERT';
    if (isset($csv_ignore)) {
        $sql_template .= ' IGNORE';
    }
}
$sql_template .= ' INTO ' . PMA_backquote($table);

$tmp_fields = PMA_DBI_get_fields($db, $table);

if (empty($csv_columns)) {
    $fields = $tmp_fields;
} else {
    $sql_template .= ' (';
    $fields = array();
    $tmp   = split(',( ?)', $csv_columns);
    foreach ($tmp as $key => $val) {
        if (count($fields) > 0) {
            $sql_template .= ', ';
        }
        /* Trim also `, if user already included backquoted fields */
        $val = trim($val, " \t\r\n\0\x0B`");
        $found = FALSE;
        foreach ($tmp_fields as $id => $field) {
            if ($field['Field'] == $val) {
                $found = TRUE;
                break;
            }
        }
        if (!$found) {
            $message = PMA_Message::error('strInvalidColumn');
            $message->addParam($val);
            $error = TRUE;
            break;
        }
        $fields[] = $field;
        $sql_template .= PMA_backquote($val);
    }
    $sql_template .= ') ';
}

$required_fields = count($fields);

$sql_template .= ' VALUES (';

// Defaults for parser
$i = 0;
$len = 0;
$line = 1;
$lasti = -1;
$values = array();
$csv_finish = FALSE;

while (!($finished && $i >= $len) && !$error && !$timeout_passed) {
    $data = PMA_importGetNextChunk();
    if ($data === FALSE) {
        // subtract data we didn't handle yet and stop processing
        $offset -= strlen($buffer);
        break;
    } elseif ($data === TRUE) {
        // Handle rest of buffer
    } else {
        // Append new data to buffer
        $buffer .= $data;
        unset($data);
        // Do not parse string when we're not at the end and don't have new line inside
        if (($csv_new_line == 'auto' && strpos($buffer, "\r") === FALSE && strpos($buffer, "\n") === FALSE)
            || ($csv_new_line != 'auto' && strpos($buffer, $csv_new_line) === FALSE)) {
            continue;
        }
    }

    // Current length of our buffer
    $len = strlen($buffer);
    // Currently parsed char
    $ch = $buffer[$i];
    while ($i < $len) {
        // Deadlock protection
        if ($lasti == $i && $lastlen == $len) {
            $message = PMA_Message::error('strInvalidCSVFormat');
            $message->addParam($line);
            $error = TRUE;
            break;
        }
        $lasti = $i;
        $lastlen = $len;

        // This can happen with auto EOL and \r at the end of buffer
        if (!$csv_finish) {
            // Grab empty field
            if ($ch == $csv_terminated) {
                if ($i == $len - 1) {
                    break;
                }
                $values[] = '';
                $i++;
                $ch = $buffer[$i];
                continue;
            }

            // Grab one field
            $fallbacki = $i;
            if ($ch == $csv_enclosed) {
                if ($i == $len - 1) {
                    break;
                }
                $need_end = TRUE;
                $i++;
                $ch = $buffer[$i];
            } else {
                $need_end = FALSE;
            }
            $fail = FALSE;
            $value = '';
            while (($need_end && $ch != $csv_enclosed)
             || (!$need_end && !($ch == $csv_terminated
               || $ch == $csv_new_line || ($csv_new_line == 'auto'
                && ($ch == "\r" || $ch == "\n"))))) {
                if ($ch == $csv_escaped) {
                    if ($i == $len - 1) {
                        $fail = TRUE;
                        break;
                    }
                    $i++;
                    $ch = $buffer[$i];
                }
                $value .= $ch;
                if ($i == $len - 1) {
                    if (!$finished) {
                        $fail = TRUE;
                    }
                    break;
                }
                $i++;
                $ch = $buffer[$i];
            }

            // unquoted NULL string
            if (false === $need_end && $value === 'NULL') {
                $value = null;
            }

            if ($fail) {
                $i = $fallbacki;
                $ch = $buffer[$i];
                break;
            }
            // Need to strip trailing enclosing char?
            if ($need_end && $ch == $csv_enclosed) {
                if ($finished && $i == $len - 1) {
                    $ch = NULL;
                } elseif ($i == $len - 1) {
                    $i = $fallbacki;
                    $ch = $buffer[$i];
                    break;
                } else {
                    $i++;
                    $ch = $buffer[$i];
                }
            }
            // Are we at the end?
            if ($ch == $csv_new_line || ($csv_new_line == 'auto' && ($ch == "\r" || $ch == "\n")) || ($finished && $i == $len - 1)) {
                $csv_finish = TRUE;
            }
            // Go to next char
            if ($ch == $csv_terminated) {
                if ($i == $len - 1) {
                    $i = $fallbacki;
                    $ch = $buffer[$i];
                    break;
                }
                $i++;
                $ch = $buffer[$i];
            }
            // If everything went okay, store value
            $values[] = $value;
        }

        // End of line
        if ($csv_finish || $ch == $csv_new_line || ($csv_new_line == 'auto' && ($ch == "\r" || $ch == "\n"))) {
            if ($csv_new_line == 'auto' && $ch == "\r") { // Handle "\r\n"
                if ($i >= ($len - 2) && !$finished) {
                    break; // We need more data to decide new line
                }
                if ($buffer[$i + 1] == "\n") {
                    $i++;
                }
            }
            // We didn't parse value till the end of line, so there was empty one
            if (!$csv_finish) {
                $values[] = '';
            }
            // Do we have correct count of values?
            if (count($values) != $required_fields) {

                // Hack for excel
                if ($values[count($values) - 1] == ';') {
                    unset($values[count($values) - 1]);
                } else {
                    $message = PMA_Message::error('strInvalidCSVFieldCount');
                    $message->addParam($line);
                    $error = TRUE;
                    break;
                }
            }

            $first = TRUE;
            $sql = $sql_template;
            foreach ($values as $key => $val) {
                if (!$first) {
                    $sql .= ', ';
                }
                if ($val === null) {
                    $sql .= 'NULL';
                } else {
                    $sql .= '\'' . addslashes($val) . '\'';
                }

                $first = FALSE;
            }
            $sql .= ')';

            /**
             * @todo maybe we could add original line to verbose SQL in comment
             */
            PMA_importRunQuery($sql, $sql);
            $line++;
            $csv_finish = FALSE;
            $values = array();
            $buffer = substr($buffer, $i + 1);
            $len = strlen($buffer);
            $i = 0;
            $lasti = -1;
            $ch = $buffer[0];
        }
    } // End of parser loop
} // End of import loop

// Commit any possible data in buffers
PMA_importRunQuery();

if (count($values) != 0 && !$error) {
    $message = PMA_Message::error('strInvalidCSVFormat');
    $message->addParam($line);
    $error = TRUE;
}
?>
