<?php

/**
  V5.10 10 Nov 2009   (c) 2000-2009 John Lim (jlim#natsoft.com). All rights reserved.
  Released under both BSD license and Lesser GPL library license. 
  Whenever there is any discrepancy between the two licenses, 
  the BSD license will take precedence.
	
  Set tabs to 4 for best viewing.
 
 	DOCUMENTATION:
	
		See adodb/tests/test-datadict.php for docs and examples.
*/

/*
	Test script for parser
*/

// security - hide paths
if (!defined('ADODB_DIR')) die();

function Lens_ParseTest()
{
$str = "`zcol ACOL` NUMBER(32,2) DEFAULT 'The \"cow\" (and Jim''s dog) jumps over the moon' PRIMARY, INTI INT AUTO DEFAULT 0, zcol2\"afs ds";
print "<p>$str</p>";
$a= Lens_ParseArgs($str);
print "<pre>";
print_r($a);
print "</pre>";
}


if (!function_exists('ctype_alnum')) {
	function ctype_alnum($text) {
		return preg_match('/^[a-z0-9]*$/i', $text);
	}
}

//Lens_ParseTest();

/**
	Parse arguments, treat "text" (text) and 'text' as quotation marks.
	To escape, use "" or '' or ))
	
	Will read in "abc def" sans quotes, as: abc def
	Same with 'abc def'.
	However if `abc def`, then will read in as `abc def`
	
	@param endstmtchar    Character that indicates end of statement
	@param tokenchars     Include the following characters in tokens apart from A-Z and 0-9 
	@returns 2 dimensional array containing parsed tokens.
*/
function Lens_ParseArgs($args,$endstmtchar=',',$tokenchars='_.-')
{
	$pos = 0;
	$intoken = false;
	$stmtno = 0;
	$endquote = false;
	$tokens = array();
	$tokens[$stmtno] = array();
	$max = strlen($args);
	$quoted = false;
	$tokarr = array();
	
	while ($pos < $max) {
		$ch = substr($args,$pos,1);
		switch($ch) {
		case ' ':
		case "\t":
		case "\n":
		case "\r":
			if (!$quoted) {
				if ($intoken) {
					$intoken = false;
					$tokens[$stmtno][] = implode('',$tokarr);
				}
				break;
			}
			
			$tokarr[] = $ch;
			break;
		
		case '`':
			if ($intoken) $tokarr[] = $ch;
		case '(':
		case ')':	
		case '"':
		case "'":
			
			if ($intoken) {
				if (empty($endquote)) {
					$tokens[$stmtno][] = implode('',$tokarr);
					if ($ch == '(') $endquote = ')';
					else $endquote = $ch;
					$quoted = true;
					$intoken = true;
					$tokarr = array();
				} else if ($endquote == $ch) {
					$ch2 = substr($args,$pos+1,1);
					if ($ch2 == $endquote) {
						$pos += 1;
						$tokarr[] = $ch2;
					} else {
						$quoted = false;
						$intoken = false;
						$tokens[$stmtno][] = implode('',$tokarr);
						$endquote = '';
					}
				} else
					$tokarr[] = $ch;
					
			}else {
			
				if ($ch == '(') $endquote = ')';
				else $endquote = $ch;
				$quoted = true;
				$intoken = true;
				$tokarr = array();
				if ($ch == '`') $tokarr[] = '`';
			}
			break;
			
		default:
			
			if (!$intoken) {
				if ($ch == $endstmtchar) {
					$stmtno += 1;
					$tokens[$stmtno] = array();
					break;
				}
			
				$intoken = true;
				$quoted = false;
				$endquote = false;
				$tokarr = array();
	
			}
			
			if ($quoted) $tokarr[] = $ch;
			else if (ctype_alnum($ch) || strpos($tokenchars,$ch) !== false) $tokarr[] = $ch;
			else {
				if ($ch == $endstmtchar) {			
					$tokens[$stmtno][] = implode('',$tokarr);
					$stmtno += 1;
					$tokens[$stmtno] = array();
					$intoken = false;
					$tokarr = array();
					break;
				}
				$tokens[$stmtno][] = implode('',$tokarr);
				$tokens[$stmtno][] = $ch;
				$intoken = false;
			}
		}
		$pos += 1;
	}
	if ($intoken) $tokens[$stmtno][] = implode('',$tokarr);
	
	return $tokens;
}


class ADODB_DataDict {
	var $connection;
	var $debug = false;
	var $dropTable = 'DROP TABLE %s';
	var $renameTable = 'RENAME TABLE %s TO %s'; 
	var $dropIndex = 'DROP INDEX %s';
	var $addCol = ' ADD';
	var $alterCol = ' ALTER COLUMN';
	var $dropCol = ' DROP COLUMN';
	var $renameColumn = 'ALTER TABLE %s RENAME COLUMN %s TO %s';	// table, old-column, new-column, column-definitions (not used by default)
	var $nameRegex = '\w';
	var $nameRegexBrackets = 'a-zA-Z0-9_\(\)';
	var $schema = false;
	var $serverInfo = array();
	var $autoIncrement = false;
	var $dataProvider;
	var $invalidResizeTypes4 = array('CLOB','BLOB','TEXT','DATE','TIME'); // for changetablesql
	var $blobSize = 100; 	///