adodb-xmlschema.inc.php

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<?php
// Copyright (c) 2004 ars Cognita Inc., 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.
*******************************************************************************/
function _file_get_contents($file)
{
    if (function_exists('file_get_contents')) return file_get_contents($file);

    $f = fopen($file,'r');
    if (!$f) return '';
    $t = '';

    while ($s = fread($f,100000)) $t .= $s;
    fclose($f);
    return $t;
}


if( !defined( 'XMLS_DEBUG' ) ) {
    define( 'XMLS_DEBUG', FALSE );
}

if( !defined( 'XMLS_PREFIX' ) ) {
    define( 'XMLS_PREFIX', '%%P' );
}

if( !defined( 'XMLS_PREFIX_MAXLEN' ) ) {
    define( 'XMLS_PREFIX_MAXLEN', 10 );
}

if( !defined( 'XMLS_EXECUTE_INLINE' ) ) {
    define( 'XMLS_EXECUTE_INLINE', FALSE );
}

if( !defined( 'XMLS_CONTINUE_ON_ERROR' ) ) {
    define( 'XMLS_CONTINUE_ON_ERROR', FALSE );
}

if( !defined( 'XMLS_SCHEMA_VERSION' ) ) {
    define( 'XMLS_SCHEMA_VERSION', '0.2' );
}

if( !defined( 'XMLS_DEFAULT_SCHEMA_VERSION' ) ) {
    define( 'XMLS_DEFAULT_SCHEMA_VERSION', '0.1' );
}

if( !defined( 'XMLS_DEFAULT_UPGRADE_METHOD' ) ) {
    define( 'XMLS_DEFAULT_UPGRADE_METHOD', 'ALTER' );
}

if( !defined( '_ADODB_LAYER' ) ) {
    require( 'adodb.inc.php' );
    require( 'adodb-datadict.inc.php' );
}

class dbObject {

    var $parent;

    var $currentElement;

    function __construct( &$parent, $attributes = NULL ) {
        $this->parent = $parent;
    }

    function _tag_open( &$parser, $tag, $attributes ) {

    }

    function _tag_cdata( &$parser, $cdata ) {

    }

    function _tag_close( &$parser, $tag ) {

    }

    function create(&$xmls) {
        return array();
    }

    function destroy() {
    }

    function supportedPlatform( $platform = NULL ) {
        return is_object( $this->parent ) ? $this->parent->supportedPlatform( $platform ) : TRUE;
    }

    function prefix( $name = '' ) {
        return is_object( $this->parent ) ? $this->parent->prefix( $name ) : $name;
    }

    function FieldID( $field ) {
        return strtoupper( preg_replace( '/^`(.+)`$/', '$1', $field ) );
    }
}

class dbTable extends dbObject {

    var $name;

    var $fields = array();

    var $indexes = array();

    var $opts = array();

    var $current_field;

    var $drop_table;

    var $drop_field = array();

    function __construct( &$parent, $attributes = NULL ) {
        $this->parent = $parent;
        $this->name = $this->prefix($attributes['NAME']);
    }

    function _tag_open( &$parser, $tag, $attributes ) {
        $this->currentElement = strtoupper( $tag );

        switch( $this->currentElement ) {
            case 'INDEX':
                if( !isset( $attributes['PLATFORM'] ) OR $this->supportedPlatform( $attributes['PLATFORM'] ) ) {
                    xml_set_object( $parser, $this->addIndex( $attributes ) );
                }
                break;
            case 'DATA':
                if( !isset( $attributes['PLATFORM'] ) OR $this->supportedPlatform( $attributes['PLATFORM'] ) ) {
                    xml_set_object( $parser, $this->addData( $attributes ) );
                }
                break;
            case 'DROP':
                $this->drop();
                break;
            case 'FIELD':
                // Add a field
                $fieldName = $attributes['NAME'];
                $fieldType = $attributes['TYPE'];
                $fieldSize = isset( $attributes['SIZE'] ) ? $attributes['SIZE'] : NULL;
                $fieldOpts = isset( $attributes['OPTS'] ) ? $attributes['OPTS'] : NULL;

                $this->addField( $fieldName, $fieldType, $fieldSize, $fieldOpts );
                break;
            case 'KEY':
            case 'NOTNULL':
            case 'AUTOINCREMENT':
                // Add a field option
                $this->addFieldOpt( $this->current_field, $this->currentElement );
                break;
            case 'DEFAULT':
                // Add a field option to the table object

                // Work around ADOdb datadict issue that misinterprets empty strings.
                if( $attributes['VALUE'] == '' ) {
                    $attributes['VALUE'] = " '' ";
                }

                $this->addFieldOpt( $this->current_field, $this->currentElement, $attributes['VALUE'] );
                break;
            case 'DEFDATE':
            case 'DEFTIMESTAMP':
                // Add a field option to the table object
                $this->addFieldOpt( $this->current_field, $this->currentElement );
                break;
            default:
                // print_r( array( $tag, $attributes ) );
        }
    }

    function _tag_cdata( &$parser, $cdata ) {
        switch( $this->currentElement ) {
            // Table constraint
            case 'CONSTRAINT':
                if( isset( $this->current_field ) ) {
                    $this->addFieldOpt( $this->current_field, $this->currentElement, $cdata );
                } else {
                    $this->addTableOpt( $cdata );
                }
                break;
            // Table option
            case 'OPT':
                $this->addTableOpt( $cdata );
                break;
            default:

        }
    }

    function _tag_close( &$parser, $tag ) {
        $this->currentElement = '';

        switch( strtoupper( $tag ) ) {
            case 'TABLE':
                $this->parent->addSQL( $this->create( $this->parent ) );
                xml_set_object( $parser, $this->parent );
                $this->destroy();
                break;
            case 'FIELD':
                unset($this->current_field);
                break;

        }
    }

    function addIndex( $attributes ) {
        $name = strtoupper( $attributes['NAME'] );
        $this->indexes[$name] = new dbIndex( $this, $attributes );
        return $this->indexes[$name];
    }

    function addData( $attributes ) {
        if( !isset( $this->data ) ) {
            $this->data = new dbData( $this, $attributes );
        }
        return $this->data;
    }

    function addField( $name, $type, $size = NULL, $opts = NULL ) {
        $field_id = $this->FieldID( $name );

        // Set the field index so we know where we are
        $this->current_field = $field_id;

        // Set the field name (required)
        $this->fields[$field_id]['NAME'] = $name;

        // Set the field type (required)
        $this->fields[$field_id]['TYPE'] = $type;

        // Set the field size (optional)
        if( isset( $size ) ) {
            $this->fields[$field_id]['SIZE'] = $size;
        }

        // Set the field options
        if( isset( $opts ) ) {
            $this->fields[$field_id]['OPTS'][] = $opts;
        }
    }

    function addFieldOpt( $field, $opt, $value = NULL ) {
        if( !isset( $value ) ) {
            $this->fields[$this->FieldID( $field )]['OPTS'][] = $opt;
        // Add the option and value
        } else {
            $this->fields[$this->FieldID( $field )]['OPTS'][] = array( $opt => $value );
        }
    }

    function addTableOpt( $opt ) {
        if(isset($this->currentPlatform)) {
            $this->opts[$this->parent->db->databaseType] = $opt;
        }
        return $this->opts;
    }


    function create( &$xmls ) {
        $sql = array();

        // drop any existing indexes
        if( is_array( $legacy_indexes = $xmls->dict->MetaIndexes( $this->name ) ) ) {
            foreach( $legacy_indexes as $index => $index_details ) {
                $sql[] = $xmls->dict->DropIndexSQL( $index, $this->name );
            }
        }

        // remove fields to be dropped from table object
        foreach( $this->drop_field as $field ) {
            unset( $this->fields[$field] );
        }

        // if table exists
        if( is_array( $legacy_fields = $xmls->dict->MetaColumns( $this->name ) ) ) {
            // drop table
            if( $this->drop_table ) {
                $sql[] = $xmls->dict->DropTableSQL( $this->name );

                return $sql;
            }

            // drop any existing fields not in schema
            foreach( $legacy_fields as $field_id => $field ) {
                if( !isset( $this->fields[$field_id] ) ) {
                    $sql[] = $xmls->dict->DropColumnSQL( $this->name, '`'.$field->name.'`' );
                }
            }
        // if table doesn't exist
        } else {
            if( $this->drop_table ) {
                return $sql;
            }

            $legacy_fields = array();
        }

        // Loop through the field specifier array, building the associative array for the field options
        $fldarray = array();

        foreach( $this->fields as $field_id => $finfo ) {
            // Set an empty size if it isn't supplied
            if( !isset( $finfo['SIZE'] ) ) {
                $finfo['SIZE'] = '';
            }

            // Initialize the field array with the type and size
            $fldarray[$field_id] = array(
                'NAME' => $finfo['NAME'],
                'TYPE' => $finfo['TYPE'],
                'SIZE' => $finfo['SIZE']
            );

            // Loop through the options array and add the field options.
            if( isset( $finfo['OPTS'] ) ) {
                foreach( $finfo['OPTS'] as $opt ) {
                    // Option has an argument.
                    if( is_array( $opt ) ) {
                        $key = key( $opt );
                        $value = $opt[key( $opt )];
                        @$fldarray[$field_id][$key] .= $value;
                    // Option doesn't have arguments
                    } else {
                        $fldarray[$field_id][$opt] = $opt;
                    }
                }
            }
        }

        if( empty( $legacy_fields ) ) {
            // Create the new table
            $sql[] = $xmls->dict->CreateTableSQL( $this->name, $fldarray, $this->opts );
            logMsg( end( $sql ), 'Generated CreateTableSQL' );
        } else {
            // Upgrade an existing table
            logMsg( "Upgrading {$this->name} using '{$xmls->upgrade}'" );
            switch( $xmls->upgrade ) {
                // Use ChangeTableSQL
                case 'ALTER':
                    logMsg( 'Generated ChangeTableSQL (ALTERing table)' );
                    $sql[] = $xmls->dict->ChangeTableSQL( $this->name, $fldarray, $this->opts );
                    break;
                case 'REPLACE':
                    logMsg( 'Doing upgrade REPLACE (testing)' );
                    $sql[] = $xmls->dict->DropTableSQL( $this->name );
                    $sql[] = $xmls->dict->CreateTableSQL( $this->name, $fldarray, $this->opts );
                    break;
                // ignore table
                default:
                    return array();
            }
        }

        foreach( $this->indexes as $index ) {
            $sql[] = $index->create( $xmls );
        }

        if( isset( $this->data ) ) {
            $sql[] = $this->data->create( $xmls );
        }

        return $sql;
    }

    function drop() {
        if( isset( $this->current_field ) ) {
            // Drop the current field
            logMsg( "Dropping field '{$this->current_field}' from table '{$this->name}'" );
            // $this->drop_field[$this->current_field] = $xmls->dict->DropColumnSQL( $this->name, $this->current_field );
            $this->drop_field[$this->current_field] = $this->current_field;
        } else {
            // Drop the current table
            logMsg( "Dropping table '{$this->name}'" );
            // $this->drop_table = $xmls->dict->DropTableSQL( $this->name );
            $this->drop_table = TRUE;
        }
    }
}

class dbIndex extends dbObject {

    var $name;

    var $opts = array();

    var $columns = array();

    var $drop = FALSE;

    function __construct( &$parent, $attributes = NULL ) {
        $this->parent = $parent;

        $this->name = $this->prefix ($attributes['NAME']);
    }

    function _tag_open( &$parser, $tag, $attributes ) {
        $this->currentElement = strtoupper( $tag );

        switch( $this->currentElement ) {
            case 'DROP':
                $this->drop();
                break;
            case 'CLUSTERED':
            case 'BITMAP':
            case 'UNIQUE':
            case 'FULLTEXT':
            case 'HASH':
                // Add index Option
                $this->addIndexOpt( $this->currentElement );
                break;
            default:
                // print_r( array( $tag, $attributes ) );
        }
    }

    function _tag_cdata( &$parser, $cdata ) {
        switch( $this->currentElement ) {
            // Index field name
            case 'COL':
                $this->addField( $cdata );
                break;
            default:

        }
    }

    function _tag_close( &$parser, $tag ) {
        $this->currentElement = '';

        switch( strtoupper( $tag ) ) {
            case 'INDEX':
                xml_set_object( $parser, $this->parent );
                break;
        }
    }

    function addField( $name ) {
        $this->columns[$this->FieldID( $name )] = $name;

        // Return the field list
        return $this->columns;
    }

    function addIndexOpt( $opt ) {
        $this->opts[] = $opt;

        // Return the options list
        return $this->opts;
    }

    function create( &$xmls ) {
        if( $this->drop ) {
            return NULL;
        }

        // eliminate any columns that aren't in the table
        foreach( $this->columns as $id => $col ) {
            if( !isset( $this->parent->fields[$id] ) ) {
                unset( $this->columns[$id] );
            }
        }

        return $xmls->dict->CreateIndexSQL( $this->name, $this->parent->name, $this->columns, $this->opts );
    }

    function drop() {
        $this->drop = TRUE;
    }
}

class dbData extends dbObject {

    var $data = array();

    var $row;

    function __construct( &$parent, $attributes = NULL ) {
        $this->parent = $parent;
    }

    function _tag_open( &$parser, $tag, $attributes ) {
        $this->currentElement = strtoupper( $tag );

        switch( $this->currentElement ) {
            case 'ROW':
                $this->row = count( $this->data );
                $this->data[$this->row] = array();
                break;
            case 'F':
                $this->addField($attributes);
            default:
                // print_r( array( $tag, $attributes ) );
        }
    }

    function _tag_cdata( &$parser, $cdata ) {
        switch( $this->currentElement ) {
            // Index field name
            case 'F':
                $this->addData( $cdata );
                break;
            default:

        }
    }

    function _tag_close( &$parser, $tag ) {
        $this->currentElement = '';

        switch( strtoupper( $tag ) ) {
            case 'DATA':
                xml_set_object( $parser, $this->parent );
                break;
        }
    }

    function addField( $attributes ) {
        if( isset( $attributes['NAME'] ) ) {
            $name = $attributes['NAME'];
        } else {
            $name = count($this->data[$this->row]);
        }

        // Set the field index so we know where we are
        $this->current_field = $this->FieldID( $name );
    }

    function addData( $cdata ) {
        if( !isset( $this->data[$this->row] ) ) {
            $this->data[$this->row] = array();
        }

        if( !isset( $this->data[$this->row][$this->current_field] ) ) {
            $this->data[$this->row][$this->current_field] = '';
        }

        $this->data[$this->row][$this->current_field] .= $cdata;
    }

    function create( &$xmls ) {
        $table = $xmls->dict->TableName($this->parent->name);
        $table_field_count = count($this->parent->fields);
        $sql = array();

        // eliminate any columns that aren't in the table
        foreach( $this->data as $row ) {
            $table_fields = $this->parent->fields;
            $fields = array();

            foreach( $row as $field_id => $field_data ) {
                if( !array_key_exists( $field_id, $table_fields ) ) {
                    if( is_numeric( $field_id ) ) {
                        $field_id = reset( array_keys( $table_fields ) );
                    } else {
                        continue;
                    }
                }

                $name = $table_fields[$field_id]['NAME'];

                switch( $table_fields[$field_id]['TYPE'] ) {
                    case 'C':
                    case 'C2':
                    case 'X':
                    case 'X2':
                        $fields[$name] = $xmls->db->qstr( $field_data );
                        break;
                    case 'I':
                    case 'I1':
                    case 'I2':
                    case 'I4':
                    case 'I8':
                        $fields[$name] = intval($field_data);
                        break;
                    default:
                        $fields[$name] = $field_data;
                }

                unset($table_fields[$field_id]);
            }

            // check that at least 1 column is specified
            if( empty( $fields ) ) {
                continue;
            }

            // check that no required columns are missing
            if( count( $fields ) < $table_field_count ) {
                foreach( $table_fields as $field ) {
                    if (isset( $field['OPTS'] ))
                        if( ( in_array( 'NOTNULL', $field['OPTS'] ) || in_array( 'KEY', $field['OPTS'] ) ) && !in_array( 'AUTOINCREMENT', $field['OPTS'] ) ) {
                            continue(2);
                        }
                }
            }

            $sql[] = 'INSERT INTO '. $table .' ('. implode( ',', array_keys( $fields ) ) .') VALUES ('. implode( ',', $fields ) .')';
        }

        return $sql;
    }
}

class dbQuerySet extends dbObject {

    var $queries = array();

    var $query;

    var $prefixKey = '';

    var $prefixMethod = 'AUTO';

    function __construct( &$parent, $attributes = NULL ) {
        $this->parent = $parent;

        // Overrides the manual prefix key
        if( isset( $attributes['KEY'] ) ) {
            $this->prefixKey = $attributes['KEY'];
        }

        $prefixMethod = isset( $attributes['PREFIXMETHOD'] ) ? strtoupper( trim( $attributes['PREFIXMETHOD'] ) ) : '';

        // Enables or disables automatic prefix prepending
        switch( $prefixMethod ) {
            case 'AUTO':
                $this->prefixMethod = 'AUTO';
                break;
            case 'MANUAL':
                $this->prefixMethod = 'MANUAL';
                break;
            case 'NONE':
                $this->prefixMethod = 'NONE';
                break;
        }
    }

    function _tag_open( &$parser, $tag, $attributes ) {
        $this->currentElement = strtoupper( $tag );

        switch( $this->currentElement ) {
            case 'QUERY':
                // Create a new query in a SQL queryset.
                // Ignore this query set if a platform is specified and it's different than the
                // current connection platform.
                if( !isset( $attributes['PLATFORM'] ) OR $this->supportedPlatform( $attributes['PLATFORM'] ) ) {
                    $this->newQuery();
                } else {
                    $this->discardQuery();
                }
                break;
            default:
                // print_r( array( $tag, $attributes ) );
        }
    }

    function _tag_cdata( &$parser, $cdata ) {
        switch( $this->currentElement ) {
            // Line of queryset SQL data
            case 'QUERY':
                $this->buildQuery( $cdata );
                break;
            default:

        }
    }

    function _tag_close( &$parser, $tag ) {
        $this->currentElement = '';

        switch( strtoupper( $tag ) ) {
            case 'QUERY':
                // Add the finished query to the open query set.
                $this->addQuery();
                break;
            case 'SQL':
                $this->parent->addSQL( $this->create( $this->parent ) );
                xml_set_object( $parser, $this->parent );
                $this->destroy();
                break;
            default:

        }
    }

    function newQuery() {
        $this->query = '';

        return TRUE;
    }

    function discardQuery() {
        unset( $this->query );

        return TRUE;
    }

    function buildQuery( $sql = NULL ) {
        if( !isset( $this->query ) OR empty( $sql ) ) {
            return FALSE;
        }

        $this->query .= $sql;

        return $this->query;
    }

    function addQuery() {
        if( !isset( $this->query ) ) {
            return FALSE;
        }

        $this->queries[] = $return = trim($this->query);

        unset( $this->query );

        return $return;
    }

    function create( &$xmls ) {
        foreach( $this->queries as $id => $query ) {
            switch( $this->prefixMethod ) {
                case 'AUTO':
                    // Enable auto prefix replacement

                    // Process object prefix.
                    // Evaluate SQL statements to prepend prefix to objects
                    $query = $this->prefixQuery( '/^\s*((?is)INSERT\s+(INTO\s+)?)((\w+\s*,?\s*)+)(\s.*$)/', $query, $xmls->objectPrefix );
                    $query = $this->prefixQuery( '/^\s*((?is)UPDATE\s+(FROM\s+)?)((\w+\s*,?\s*)+)(\s.*$)/', $query, $xmls->objectPrefix );
                    $query = $this->prefixQuery( '/^\s*((?is)DELETE\s+(FROM\s+)?)((\w+\s*,?\s*)+)(\s.*$)/', $query, $xmls->objectPrefix );

                    // SELECT statements aren't working yet
                    #$data = preg_replace( '/(?ias)(^\s*SELECT\s+.*\s+FROM)\s+(\W\s*,?\s*)+((?i)\s+WHERE.*$)/', "\1 $prefix\2 \3", $data );

                case 'MANUAL':
                    // If prefixKey is set and has a value then we use it to override the default constant XMLS_PREFIX.
                    // If prefixKey is not set, we use the default constant XMLS_PREFIX
                    if( isset( $this->prefixKey ) AND( $this->prefixKey !== '' ) ) {
                        // Enable prefix override
                        $query = str_replace( $this->prefixKey, $xmls->objectPrefix, $query );
                    } else {
                        // Use default replacement
                        $query = str_replace( XMLS_PREFIX , $xmls->objectPrefix, $query );
                    }
            }

            $this->queries[$id] = trim( $query );
        }

        // Return the query set array
        return $this->queries;
    }

    function prefixQuery( $regex, $query, $prefix = NULL ) {
        if( !isset( $prefix ) ) {
            return $query;
        }

        if( preg_match( $regex, $query, $match ) ) {
            $preamble = $match[1];
            $postamble = $match[5];
            $objectList = explode( ',', $match[3] );
            // $prefix = $prefix . '_';

            $prefixedList = '';

            foreach( $objectList as $object ) {
                if( $prefixedList !== '' ) {
                    $prefixedList .= ', ';
                }

                $prefixedList .= $prefix . trim( $object );
            }

            $query = $preamble . ' ' . $prefixedList . ' ' . $postamble;
        }

        return $query;
    }
}

class adoSchema {

    var $sqlArray;

    var $db;

    var $dict;

    var $currentElement = '';

    var $upgrade = '';

    var $objectPrefix = '';

    var $mgq;

    var $debug;

    var $versionRegex = '/<schema.*?( version="([^"]*)")?.*?>/';

    var $schemaVersion;

    var $success;

    var $executeInline;

    var $continueOnError;

    function __construct( $db ) {
        // Initialize the environment
        $this->mgq = get_magic_quotes_runtime();
        ini_set("magic_quotes_runtime", 0);
        #set_magic_quotes_runtime(0);

        $this->db = $db;
        $this->debug = $this->db->debug;
        $this->dict = NewDataDictionary( $this->db );
        $this->sqlArray = array();
        $this->schemaVersion = XMLS_SCHEMA_VERSION;
        $this->executeInline( XMLS_EXECUTE_INLINE );
        $this->continueOnError( XMLS_CONTINUE_ON_ERROR );
        $this->setUpgradeMethod();
    }

    function SetUpgradeMethod( $method = '' ) {
        if( !is_string( $method ) ) {
            return FALSE;
        }

        $method = strtoupper( $method );

        // Handle the upgrade methods
        switch( $method ) {
            case 'ALTER':
                $this->upgrade = $method;
                break;
            case 'REPLACE':
                $this->upgrade = $method;
                break;
            case 'BEST':
                $this->upgrade = 'ALTER';
                break;
            case 'NONE':
                $this->upgrade = 'NONE';
                break;
            default:
                // Use default if no legitimate method is passed.
                $this->upgrade = XMLS_DEFAULT_UPGRADE_METHOD;
        }

        return $this->upgrade;
    }

    function ExecuteInline( $mode = NULL ) {
        if( is_bool( $mode ) ) {
            $this->executeInline = $mode;
        }

        return $this->executeInline;
    }

    function ContinueOnError( $mode = NULL ) {
        if( is_bool( $mode ) ) {
            $this->continueOnError = $mode;
        }

        return $this->continueOnError;
    }

    function ParseSchema( $filename, $returnSchema = FALSE ) {
        return $this->ParseSchemaString( $this->ConvertSchemaFile( $filename ), $returnSchema );
    }

    function ParseSchemaFile( $filename, $returnSchema = FALSE ) {
        // Open the file
        if( !($fp = fopen( $filename, 'r' )) ) {
            // die( 'Unable to open file' );
            return FALSE;
        }

        // do version detection here
        if( $this->SchemaFileVersion( $filename ) != $this->schemaVersion ) {
            return FALSE;
        }

        if ( $returnSchema )
        {
            $xmlstring = '';
            while( $data = fread( $fp, 100000 ) ) {
                $xmlstring .= $data;
            }
            return $xmlstring;
        }

        $this->success = 2;

        $xmlParser = $this->create_parser();
        // Disables the functionality to allow external entities to be loaded when parsing the XML, must be kept
        $previousValueOfEntityLoader = libxml_disable_entity_loader(true);

        // Process the file
        while( $data = fread( $fp, 4096 ) ) {
            if( !xml_parse( $xmlParser, $data, feof( $fp ) ) ) {
                die( sprintf(
                    "XML error: %s at line %d",
                    xml_error_string( xml_get_error_code( $xmlParser) ),
                    xml_get_current_line_number( $xmlParser)
                ) );
            }
        }

        libxml_disable_entity_loader($previousValueOfEntityLoader);
        xml_parser_free( $xmlParser );

        return $this->sqlArray;
    }

    function ParseSchemaString( $xmlstring, $returnSchema = FALSE ) {
        if( !is_string( $xmlstring ) OR empty( $xmlstring ) ) {
            return FALSE;
        }

        // do version detection here
        if( $this->SchemaStringVersion( $xmlstring ) != $this->schemaVersion ) {
            return FALSE;
        }

        if ( $returnSchema )
        {
            return $xmlstring;
        }

        $this->success = 2;

        $xmlParser = $this->create_parser();
        // Disables the functionality to allow external entities to be loaded when parsing the XML, must be kept
        $previousValueOfEntityLoader = libxml_disable_entity_loader(true);

        if( !xml_parse( $xmlParser, $xmlstring, TRUE ) ) {
            die( sprintf(
                "XML error: %s at line %d",
                xml_error_string( xml_get_error_code( $xmlParser) ),
                xml_get_current_line_number( $xmlParser)
            ) );
        }

        libxml_disable_entity_loader($previousValueOfEntityLoader);
        xml_parser_free( $xmlParser );

        return $this->sqlArray;
    }

    function RemoveSchema( $filename, $returnSchema = FALSE ) {
        return $this->RemoveSchemaString( $this->ConvertSchemaFile( $filename ), $returnSchema );
    }

    function RemoveSchemaString( $schema, $returnSchema = FALSE ) {

        // grab current version
        if( !( $version = $this->SchemaStringVersion( $schema ) ) ) {
            return FALSE;
        }

        return $this->ParseSchemaString( $this->TransformSchema( $schema, 'remove-' . $version), $returnSchema );
    }

    function ExecuteSchema( $sqlArray = NULL, $continueOnErr =  NULL ) {
        if( !is_bool( $continueOnErr ) ) {
            $continueOnErr = $this->ContinueOnError();
        }

        if( !isset( $sqlArray ) ) {
            $sqlArray = $this->sqlArray;
        }

        if( !is_array( $sqlArray ) ) {
            $this->success = 0;
        } else {
            $this->success = $this->dict->ExecuteSQLArray( $sqlArray, $continueOnErr );
        }

        return $this->success;
    }

    function PrintSQL( $format = 'NONE' ) {
        $sqlArray = null;
        return $this->getSQL( $format, $sqlArray );
    }

    function SaveSQL( $filename = './schema.sql' ) {

        if( !isset( $sqlArray ) ) {
            $sqlArray = $this->sqlArray;
        }
        if( !isset( $sqlArray ) ) {
            return FALSE;
        }

        $fp = fopen( $filename, "w" );

        foreach( $sqlArray as $key => $query ) {
            fwrite( $fp, $query . ";\n" );
        }
        fclose( $fp );
    }

    function create_parser() {
        // Create the parser
        $xmlParser = xml_parser_create();
        xml_set_object( $xmlParser, $this );

        // Initialize the XML callback functions
        xml_set_element_handler( $xmlParser, '_tag_open', '_tag_close' );
        xml_set_character_data_handler( $xmlParser, '_tag_cdata' );

        return $xmlParser;
    }

    function _tag_open( &$parser, $tag, $attributes ) {
        switch( strtoupper( $tag ) ) {
            case 'TABLE':
                $this->obj = new dbTable( $this, $attributes );
                xml_set_object( $parser, $this->obj );
                break;
            case 'SQL':
                if( !isset( $attributes['PLATFORM'] ) OR $this->supportedPlatform( $attributes['PLATFORM'] ) ) {
                    $this->obj = new dbQuerySet( $this, $attributes );
                    xml_set_object( $parser, $this->obj );
                }
                break;
            default:
                // print_r( array( $tag, $attributes ) );
        }

    }

    function _tag_cdata( &$parser, $cdata ) {
    }

    function _tag_close( &$parser, $tag ) {

    }

    function ConvertSchemaString( $schema, $newVersion = NULL, $newFile = NULL ) {

        // grab current version
        if( !( $version = $this->SchemaStringVersion( $schema ) ) ) {
            return FALSE;
        }

        if( !isset ($newVersion) ) {
            $newVersion = $this->schemaVersion;
        }

        if( $version == $newVersion ) {
            $result = $schema;
        } else {
            $result = $this->TransformSchema( $schema, 'convert-' . $version . '-' . $newVersion);
        }

        if( is_string( $result ) AND is_string( $newFile ) AND ( $fp = fopen( $newFile, 'w' ) ) ) {
            fwrite( $fp, $result );
            fclose( $fp );
        }

        return $result;
    }

    // compat for pre-4.3 - jlim
    function _file_get_contents($path)
    {
        if (function_exists('file_get_contents')) return file_get_contents($path);
        return join('',file($path));
    }

    function ConvertSchemaFile( $filename, $newVersion = NULL, $newFile = NULL ) {

        // grab current version
        if( !( $version = $this->SchemaFileVersion( $filename ) ) ) {
            return FALSE;
        }

        if( !isset ($newVersion) ) {
            $newVersion = $this->schemaVersion;
        }

        if( $version == $newVersion ) {
            $result = _file_get_contents( $filename );

            // remove unicode BOM if present
            if( substr( $result, 0, 3 ) == sprintf( '%c%c%c', 239, 187, 191 ) ) {
                $result = substr( $result, 3 );
            }
        } else {
            $result = $this->TransformSchema( $filename, 'convert-' . $version . '-' . $newVersion, 'file' );
        }

        if( is_string( $result ) AND is_string( $newFile ) AND ( $fp = fopen( $newFile, 'w' ) ) ) {
            fwrite( $fp, $result );
            fclose( $fp );
        }

        return $result;
    }

    function TransformSchema( $schema, $xsl, $schematype='string' )
    {
        // Fail if XSLT extension is not available
        if( ! function_exists( 'xslt_create' ) ) {
            return FALSE;
        }

        $xsl_file = dirname( __FILE__ ) . '/xsl/' . $xsl . '.xsl';

        // look for xsl
        if( !is_readable( $xsl_file ) ) {
            return FALSE;
        }

        switch( $schematype )
        {
            case 'file':
                if( !is_readable( $schema ) ) {
                    return FALSE;
                }

                $schema = _file_get_contents( $schema );
                break;
            case 'string':
            default:
                if( !is_string( $schema ) ) {
                    return FALSE;
                }
        }

        $arguments = array (
            '/_xml' => $schema,
            '/_xsl' => _file_get_contents( $xsl_file )
        );

        // create an XSLT processor
        $xh = xslt_create ();

        // set error handler
        xslt_set_error_handler ($xh, array (&$this, 'xslt_error_handler'));

        // process the schema
        $result = xslt_process ($xh, 'arg:/_xml', 'arg:/_xsl', NULL, $arguments);

        xslt_free ($xh);

        return $result;
    }

    function xslt_error_handler( $parser, $errno, $level, $fields ) {
        if( is_array( $fields ) ) {
            $msg = array(
                'Message Type' => ucfirst( $fields['msgtype'] ),
                'Message Code' => $fields['code'],
                'Message' => $fields['msg'],
                'Error Number' => $errno,
                'Level' => $level
            );

            switch( $fields['URI'] ) {
                case 'arg:/_xml':
                    $msg['Input'] = 'XML';
                    break;
                case 'arg:/_xsl':
                    $msg['Input'] = 'XSL';
                    break;
                default:
                    $msg['Input'] = $fields['URI'];
            }

            $msg['Line'] = $fields['line'];
        } else {
            $msg = array(
                'Message Type' => 'Error',
                'Error Number' => $errno,
                'Level' => $level,
                'Fields' => var_export( $fields, TRUE )
            );
        }

        $error_details = $msg['Message Type'] . ' in XSLT Transformation' . "\n"
                       . '<table>' . "\n";

        foreach( $msg as $label => $details ) {
            $error_details .= '<tr><td><b>' . $label . ': </b></td><td>' . htmlentities( $details ) . '</td></tr>' . "\n";
        }

        $error_details .= '</table>';

        trigger_error( $error_details, E_USER_ERROR );
    }

    function SchemaFileVersion( $filename ) {
        // Open the file
        if( !($fp = fopen( $filename, 'r' )) ) {
            // die( 'Unable to open file' );
            return FALSE;
        }

        // Process the file
        while( $data = fread( $fp, 4096 ) ) {
            if( preg_match( $this->versionRegex, $data, $matches ) ) {
                return !empty( $matches[2] ) ? $matches[2] : XMLS_DEFAULT_SCHEMA_VERSION;
            }
        }

        return FALSE;
    }

    function SchemaStringVersion( $xmlstring ) {
        if( !is_string( $xmlstring ) OR empty( $xmlstring ) ) {
            return FALSE;
        }

        if( preg_match( $this->versionRegex, $xmlstring, $matches ) ) {
            return !empty( $matches[2] ) ? $matches[2] : XMLS_DEFAULT_SCHEMA_VERSION;
        }

        return FALSE;
    }

    function ExtractSchema( $data = FALSE ) {
        $old_mode = $this->db->SetFetchMode( ADODB_FETCH_NUM );

        $schema = '<?xml version="1.0"?>' . "\n"
                . '<schema version="' . $this->schemaVersion . '">' . "\n";

        if( is_array( $tables = $this->db->MetaTables( 'TABLES' ) ) ) {
            foreach( $tables as $table ) {
                $schema .= '    <table name="' . $table . '">' . "\n";

                // grab details from database
                $rs = $this->db->Execute( 'SELECT * FROM ' . $table . ' WHERE 1=1' );
                $fields = $this->db->MetaColumns( $table );
                $indexes = $this->db->MetaIndexes( $table );

                if( is_array( $fields ) ) {
                    foreach( $fields as $details ) {
                        $extra = '';
                        $content = array();

                        if( $details->max_length > 0 ) {
                            $extra .= ' size="' . $details->max_length . '"';
                        }

                        if( $details->primary_key ) {
                            $content[] = '<KEY/>';
                        } elseif( $details->not_null ) {
                            $content[] = '<NOTNULL/>';
                        }

                        if( $details->has_default ) {
                            $content[] = '<DEFAULT value="' . $details->default_value . '"/>';
                        }

                        if( $details->auto_increment ) {
                            $content[] = '<AUTOINCREMENT/>';
                        }

                        // this stops the creation of 'R' columns,
                        // AUTOINCREMENT is used to create auto columns
                        $details->primary_key = 0;
                        $type = $rs->MetaType( $details );

                        $schema .= '        <field name="' . $details->name . '" type="' . $type . '"' . $extra . '>';

                        if( !empty( $content ) ) {
                            $schema .= "\n          " . implode( "\n            ", $content ) . "\n     ";
                        }

                        $schema .= '</field>' . "\n";
                    }
                }

                if( is_array( $indexes ) ) {
                    foreach( $indexes as $index => $details ) {
                        $schema .= '        <index name="' . $index . '">' . "\n";

                        if( $details['unique'] ) {
                            $schema .= '            <UNIQUE/>' . "\n";
                        }

                        foreach( $details['columns'] as $column ) {
                            $schema .= '            <col>' . $column . '</col>' . "\n";
                        }

                        $schema .= '        </index>' . "\n";
                    }
                }

                if( $data ) {
                    $rs = $this->db->Execute( 'SELECT * FROM ' . $table );

                    if( is_object( $rs ) ) {
                        $schema .= '        <data>' . "\n";

                        while( $row = $rs->FetchRow() ) {
                            foreach( $row as $key => $val ) {
                                $row[$key] = htmlentities($val);
                            }

                            $schema .= '            <row><f>' . implode( '</f><f>', $row ) . '</f></row>' . "\n";
                        }

                        $schema .= '        </data>' . "\n";
                    }
                }

                $schema .= '    </table>' . "\n";
            }
        }

        $this->db->SetFetchMode( $old_mode );

        $schema .= '</schema>';
        return $schema;
    }

    function SetPrefix( $prefix = '', $underscore = TRUE ) {
        switch( TRUE ) {
            // clear prefix
            case empty( $prefix ):
                logMsg( 'Cleared prefix' );
                $this->objectPrefix = '';
                return TRUE;
            // prefix too long
            case strlen( $prefix ) > XMLS_PREFIX_MAXLEN:
            // prefix contains invalid characters
            case !preg_match( '/^[a-z][a-z0-9_]+$/i', $prefix ):
                logMsg( 'Invalid prefix: ' . $prefix );
                return FALSE;
        }

        if( $underscore AND substr( $prefix, -1 ) != '_' ) {
            $prefix .= '_';
        }

        // prefix valid
        logMsg( 'Set prefix: ' . $prefix );
        $this->objectPrefix = $prefix;
        return TRUE;
    }

    function prefix( $name = '' ) {
        // if prefix is set
        if( !empty( $this->objectPrefix ) ) {
            // Prepend the object prefix to the table name
            // prepend after quote if used
            return preg_replace( '/^(`?)(.+)$/', '$1' . $this->objectPrefix . '$2', $name );
        }

        // No prefix set. Use name provided.
        return $name;
    }

    function supportedPlatform( $platform = NULL ) {
        $regex = '/^(\w*\|)*' . $this->db->databaseType . '(\|\w*)*$/';

        if( !isset( $platform ) OR preg_match( $regex, $platform ) ) {
            logMsg( "Platform $platform is supported" );
            return TRUE;
        } else {
            logMsg( "Platform $platform is NOT supported" );
            return FALSE;
        }
    }

    function clearSQL() {
        $this->sqlArray = array();
    }

    function addSQL( $sql = NULL ) {
        if( is_array( $sql ) ) {
            foreach( $sql as $line ) {
                $this->addSQL( $line );
            }

            return TRUE;
        }

        if( is_string( $sql ) ) {
            $this->sqlArray[] = $sql;

            // if executeInline is enabled, and either no errors have occurred or continueOnError is enabled, execute SQL.
            if( $this->ExecuteInline() && ( $this->success == 2 || $this->ContinueOnError() ) ) {
                $saved = $this->db->debug;
                $this->db->debug = $this->debug;
                $ok = $this->db->Execute( $sql );
                $this->db->debug = $saved;

                if( !$ok ) {
                    if( $this->debug ) {
                        ADOConnection::outp( $this->db->ErrorMsg() );
                    }

                    $this->success = 1;
                }
            }

            return TRUE;
        }

        return FALSE;
    }

    function getSQL( $format = NULL, $sqlArray = NULL ) {
        if( !is_array( $sqlArray ) ) {
            $sqlArray = $this->sqlArray;
        }

        if( !is_array( $sqlArray ) ) {
            return FALSE;
        }

        switch( strtolower( $format ) ) {
            case 'string':
            case 'text':
                return !empty( $sqlArray ) ? implode( ";\n\n", $sqlArray ) . ';' : '';
            case'html':
                return !empty( $sqlArray ) ? nl2br( htmlentities( implode( ";\n\n", $sqlArray ) . ';' ) ) : '';
        }

        return $this->sqlArray;
    }

    function Destroy() {
        ini_set("magic_quotes_runtime", $this->mgq );
        #set_magic_quotes_runtime( $this->mgq );
    }
}

function logMsg( $msg, $title = NULL, $force = FALSE ) {
    if( XMLS_DEBUG or $force ) {
        echo '<pre>';

        if( isset( $title ) ) {
            echo '<h3>' . htmlentities( $title ) . '</h3>';
        }

        if( is_object( $this ) ) {
            echo '[' . get_class( $this ) . '] ';
        }

        print_r( $msg );

        echo '</pre>';
    }
}