mirror of
https://github.com/dg/dibi.git
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356 lines
11 KiB
PHP
356 lines
11 KiB
PHP
<?php
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/**
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* dibi - Database Abstraction Layer according to dgx
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* --------------------------------------------------
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*
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* This source file is subject to the GNU GPL license.
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*
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* @author David Grudl aka -dgx- <dave@dgx.cz>
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* @link http://texy.info/dibi/
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* @copyright Copyright (c) 2005-2006 David Grudl
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* @license GNU GENERAL PUBLIC LICENSE
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* @package dibi
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* @category Database
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* @version $Revision$ $Date$
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*/
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// security - include dibi.php, not this file
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if (!defined('DIBI')) die();
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/**
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* dibi parser
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*
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*/
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class DibiParser
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{
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private
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$modifier,
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$hasError,
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$driver,
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$ifLevel,
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$ifLevelStart;
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/**
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* Generates SQL
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*
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* @param array
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* @return string
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*/
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public function parse($driver, $args)
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{
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$this->driver = $driver;
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$this->hasError = FALSE;
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$command = null;
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$mod = & $this->modifier; // shortcut
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$mod = FALSE;
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// conditional sql
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$this->ifLevel = $this->ifLevelStart = 0;
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$comment = & $this->comment;
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$comment = FALSE;
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// iterate
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$sql = array();
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foreach ($args as $arg)
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{
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// %if was opened
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if ('if' == $mod) {
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$mod = FALSE;
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$this->ifLevel++;
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if (!$comment && !$arg) {
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// open comment
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$sql[] = '/*';
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$this->ifLevelStart = $this->ifLevel;
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$comment = TRUE;
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}
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continue;
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}
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// simple string means SQL
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if (is_string($arg) && (!$mod || 'p'==$mod)) {
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$mod = FALSE;
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// will generate new mod
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$sql[] = $this->formatValue($arg, 'p');
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continue;
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}
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// associative array without modifier - autoselect between SET or VALUES
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if (!$mod && is_array($arg) && is_string(key($arg))) {
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if (!$command)
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$command = strtoupper(substr(ltrim($args[0]), 0, 6));
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$mod = ('INSERT' == $command || 'REPLAC' == $command) ? 'V' : 'S';
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}
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// default processing
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$sql[] = $comment
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? '...'
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: $this->formatValue($arg, $mod);
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$mod = FALSE;
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} // foreach
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if ($comment) $sql[] = '*/';
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$sql = implode(' ', $sql);
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if ($this->hasError)
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return new DibiException('Errors during generating SQL', array('sql' => $sql));
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return $sql;
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}
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private function formatValue($value, $modifier)
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{
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// array processing (with or without modifier)
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if (is_array($value)) {
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$vx = $kx = array();
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switch ($modifier) {
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case 'S': // SET
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foreach ($value as $k => $v) {
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// split into identifier & modifier
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$pair = explode('%', $k, 2);
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if (isset($pair[1])) {
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$mod = $pair[1];
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// %? skips NULLS
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if (isset($mod[0]) && '?' == $mod[0]) {
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if (NULL === $v) continue;
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$mod = substr($mod, 1);
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}
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} else $mod = FALSE;
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// generate array
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$vx[] = $this->driver->quoteName($pair[0]) . '=' . $this->formatValue($v, $mod);
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}
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return implode(', ', $vx);
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case 'V': // VALUES
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foreach ($value as $k => $v) {
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// split into identifier & modifier
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$pair = explode('%', $k, 2);
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if (isset($pair[1])) {
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$mod = $pair[1];
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// %m? skips NULLS
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if (isset($mod[0]) && '?' == $mod[0]) {
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if ($v === NULL) continue;
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$mod = substr($mod, 1);
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}
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} else $mod = FALSE;
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// generate arrays
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$kx[] = $this->driver->quoteName($pair[0]);
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$vx[] = $this->formatValue($v, $mod);
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}
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return '(' . implode(', ', $kx) . ') VALUES (' . implode(', ', $vx) . ')';
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default: // LIST
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foreach ($value as $v)
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$vx[] = $this->formatValue($v, $modifier);
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return implode(', ', $vx);
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}
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}
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// with modifier procession
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if ($modifier) {
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if ($value instanceof IDibiVariable)
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return $value->toSql($this->driver, $modifier);
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if (!is_scalar($value) && !is_null($value)) { // array is already processed
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$this->hasError = TRUE;
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return '**Unexpected '.gettype($value).'**';
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}
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switch ($modifier) {
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case "s": // string
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return $this->driver->escape($value, TRUE);
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case 'b': // boolean
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return $value
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? $this->driver->formats['TRUE']
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: $this->driver->formats['FALSE'];
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case 'i':
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case 'u': // unsigned int
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case 'd': // signed int
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return (string) (int) $value;
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case 'f': // float
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return (string) (float) $value; // something like -9E-005 is accepted by SQL
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case 'D': // date
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return date($this->driver->formats['date'], is_string($value)
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? strtotime($value)
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: $value);
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case 't': // datetime
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case 'T': // datetime
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return date($this->driver->formats['datetime'], is_string($value)
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? strtotime($value)
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: $value);
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case 'n': // identifier name
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return $this->driver->quoteName($value);
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case 'p': // preserve as SQL
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$value = (string) $value;
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// speed-up - is regexp required?
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$toSkip = strcspn($value, '`[\'"%');
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if (strlen($value) == $toSkip) // needn't be translated
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return $value;
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// note: only this can change $this->modifier
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return substr($value, 0, $toSkip)
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. preg_replace_callback('/
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(?=`|\[|\'|"|%) ## speed-up
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(?:
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`(.+?)`| ## 1) `identifier`
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\[(.+?)\]| ## 2) [identifier]
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(\')((?:\'\'|[^\'])*)\'| ## 3,4) string
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(")((?:""|[^"])*)"| ## 5,6) "string"
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%(else|end)| ## 7) conditional SQL
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%([a-zA-Z]{1,2})$| ## 8) right modifier
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(\'|") ## 9) lone-quote
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)/xs',
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array($this, 'callback'),
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substr($value, $toSkip)
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);
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case 'S':
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case 'V':
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$this->hasError = TRUE;
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return "**Unexpected ".gettype($value)."**";
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case 'if':
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$this->hasError = TRUE;
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return "**The %$modifier is not allowed here**";
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default:
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$this->hasError = TRUE;
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return "**Unknown modifier %$modifier**";
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}
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}
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// without modifier procession
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if (is_string($value))
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return $this->driver->escape($value, TRUE);
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if (is_int($value) || is_float($value))
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return (string) $value; // something like -9E-005 is accepted by SQL
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if (is_bool($value))
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return $value ? $this->driver->formats['TRUE'] : $this->driver->formats['FALSE'];
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if (is_null($value))
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return $this->driver->formats['NULL'];
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if ($value instanceof IDibiVariable)
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return $value->toSql($this->driver);
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$this->hasError = TRUE;
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return '**Unexpected '.gettype($value).'**';
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}
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/**
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* PREG callback for @see self::translate()
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* @param array
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* @return string
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*/
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private function callback($matches)
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{
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// [1] => `ident`
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// [2] => [ident]
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// [3] => '
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// [4] => string
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// [5] => "
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// [6] => string
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// [7] => %else | %end
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// [8] => right modifier
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// [9] => lone-quote
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if ($matches[1]) // SQL identifiers: `ident`
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return $this->driver->quoteName($matches[1]);
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if ($matches[2]) // SQL identifiers: [ident]
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return $this->driver->quoteName($matches[2]);
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if ($matches[3]) // SQL strings: '....'
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return $this->comment
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? '...'
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: $this->driver->escape( strtr($matches[4], array("''" => "'")), TRUE);
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if ($matches[5]) // SQL strings: "..."
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return $this->comment
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? '...'
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: $this->driver->escape( strtr($matches[6], array('""' => '"')), TRUE);
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if ($matches[7]) { // %end | %else
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if (!$this->ifLevel) {
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$this->hasError = TRUE;
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return "**Unexpected condition $matches[8]**";
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}
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if ('end' == $matches[7]) {
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$this->ifLevel--;
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if ($this->ifLevelStart == $this->ifLevel + 1) {
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// close comment
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$this->ifLevelStart = 0;
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$this->comment = FALSE;
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return '*/';
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}
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return '';
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}
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// else
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if ($this->ifLevelStart == $this->ifLevel) {
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$this->ifLevelStart = 0;
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$this->comment = FALSE;
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return '*/';
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} elseif (!$this->comment) {
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$this->ifLevelStart = $this->ifLevel;
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$this->comment = TRUE;
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return '/*';
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}
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}
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if ($matches[8]) { // modifier
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$this->modifier = $matches[8];
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return '';
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}
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if ($matches[9]) { // string quote
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$this->hasError = TRUE;
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return '**Alone quote**';
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}
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die('this should be never executed');
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}
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} // class DibiParser
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?>
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