--- parser3/src/classes/table.C	2001/03/12 17:00:46	1.2
+++ parser3/src/classes/table.C	2003/02/14 16:52:20	1.172.2.7
@@ -1,93 +1,865 @@
-/*
-	Parser
-	Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
-	Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
+/** @file
+	Parser: @b table parser class.
 
-	$Id: table.C,v 1.2 2001/03/12 17:00:46 paf Exp $
+	Copyright (c) 2001-2003 ArtLebedev Group (http://www.artlebedev.com)
+	Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
 */
 
+static const char* IDENT_TABLE_C="$Date: 2003/02/14 16:52:20 $";
+
+#include "classes.h"
+#include "pa_vmethod_frame.h"
+
+#include "pa_common.h"
 #include "pa_request.h"
-#include "_table.h"
 #include "pa_vtable.h"
-#include "pa_common.h"
+#include "pa_vint.h"
+#include "pa_sql_connection.h"
+#include "pa_vbool.h"
+
+// class
+
+class MTable : public Methoded {
+public: // VStateless_class
+	ValuePtr create_new_value() { return ValuePtr(new VTable()); }
+
+public:
+	MTable();
+
+public: // Methoded
+	bool used_directly() { return true; }
+};
+
+// global variable
+
+MethodedPtr table_class(new MTable);
 
-// global var
+// defines for globals
 
-VClass *table_class;
+#define SQL_LIMIT_NAME "limit"
+#define SQL_OFFSET_NAME "offset"
+#define SQL_DEFAULT_NAME "default"
+#define SQL_DISTINCT_NAME "distinct"
+
+// globals
+
+StringPtr sql_limit_name(new String(SQL_LIMIT_NAME));
+StringPtr sql_offset_name(new String(SQL_OFFSET_NAME));
+StringPtr sql_default_name(new String(SQL_DEFAULT_NAME));
+StringPtr sql_distinct_name(new String(SQL_DISTINCT_NAME));
 
 // methods
 
+static void get_copy_options(Request& r, StringPtr method_name, MethodParams& params, int param_index,
+							 const Table& source,
+							 int& offset,
+							 int& limit) {
+	Pool& pool=r.pool();
 
-// TODO: проверить ^set в ^menu & co
+	offset=0;
+	limit=0;
+	if(params.count()<=param_index)
+		return;
+
+	ValuePtr voptions=params.as_no_junction(param_index, "options must be hash, not code");
+	if(!voptions->is_string()) {
+		if(HashStringValue* options=voptions->get_hash(method_name)) {
+			int valid_options=0;
+			if(ValuePtr voffset=options->get(sql_offset_name)) {
+				valid_options++;
+				if(voffset->is_string()) {
+					StringPtr  soffset=voffset->get_string(&pool);
+					if(*soffset == "cur")
+						offset=source.current();
+					else
+						throw Exception("parser.runtime",
+							soffset,
+							"must be 'cur' string or expression");
+				} else 
+					offset=r.process_to_value(voffset)->as_int();
+			}
+			if(ValuePtr vlimit=options->get(sql_limit_name)) {
+				valid_options++;
+				limit=r.process_to_value(vlimit)->as_int();
+			}
+			if(valid_options!=options->count())
+				throw Exception("parser.runtime",
+					method_name,
+					"called with invalid option");
+		} else
+			throw Exception("parser.runtime",
+				method_name,
+				"options must be hash");
+	}
+	if(!limit) // zero limit = sould be 'nothing to copy', for methods zero means 'all'
+		limit=-1; // thus fixing
+}
 
-static void set_or_load(
-						Request& r, 
-						const String& method_name, Array *params, 
-						bool is_load) {
+static void _create(Request& r, StringPtr method_name, MethodParams& params) {
 	Pool& pool=r.pool();
+	// clone/copy part?
+	if(const Table *source=params[0]->get_table()) {
+		int offset, limit;
+		get_copy_options(r, method_name, params, 1, *source, 
+			offset, limit);
+		GET_SELF(r, VTable).set_table(TablePtr(new Table(*source, offset, limit)));
+		return;
+	}
+
 	// data is last parameter
-	Value *vdata=static_cast<Value *>(params->get(params->size()-1));
-	if(vdata->get_junction())
-		R_THROW(0, 0,
-			&method_name,
-			"body must not be a junction");
+	Temp_lang temp_lang(r, String::UL_PASS_APPENDED);
+	StringPtr  data=
+		r.process_to_string(params.as_junction(params.count()-1, "body must be code"));
 
-	// data or file_name
-	char *data_or_filename=vdata->as_string().cstr();
-	// data
-	char *data=is_load?file_read(pool, r.absolute(data_or_filename)):data_or_filename;
+	size_t pos_after=0;
+	// parse columns
+	Table::columns_type columns;
+	if(params.count()==2) {
+		columns=Table::columns_type(0); // nameless
+	} else {
+		columns=Table::columns_type(new ArrayString);
+
+		ArrayString head;
+		data->split(head, &pos_after, "\n", 1, String::UL_AS_IS, 1);
+		if(head.count())
+			head[0]->split(*columns, 0, "\t", 1, String::UL_AS_IS);
+	}
+
+	TablePtr table(new Table(method_name, columns));
+	// parse cells
+
+	ArrayString rows;
+	data->split(rows, &pos_after, "\n", 1, String::UL_AS_IS);
+	Array_iterator<StringPtr> i(rows);
+	while(i.has_next()) {
+		Table::element_type row(new ArrayString);
+		StringPtr  string=i.next();
+		// remove comment lines
+		if(!string->size())
+			continue;
+
+		string->split(*row, 0, "\t", 1, String::UL_AS_IS);
+		*table+=row;
+	}
+
+	// replace any previous table value
+	GET_SELF(r, VTable).set_table(table);
+}
+
+static void _load(Request& r, StringPtr method_name, MethodParams& params) {
+	Pool& pool=r.pool();
+	StringPtr  first_param=params.as_string(0, "file name must be string");
+	int filename_param_index=0;
+	bool nameless=*first_param=="nameless";
+	if(nameless)
+		filename_param_index++;
+	int options_param_index=filename_param_index+1;
+	
+	// loading text
+	char *data=file_read_text(pool, r.charsets.source(),
+		r.absolute(params.as_string(filename_param_index, "file name must be string")),
+		true,
+		options_param_index<params.count()?params.as_no_junction(options_param_index, "additional params must be hash")->get_hash(method_name):0
+	);
 
 	// parse columns
-	Array *columns;
+	Table::columns_type columns;
 #ifndef NO_STRING_ORIGIN
-	const Origin& origin=method_name.origin();
-	const char *file=origin.file;
+	const String_fragment::Origin& origin=method_name->origin();
+	const char* file=origin.file;
 	uint line=origin.line;
 #endif
-	if(params->size()==2) {
-		columns=0;
+	if(nameless) {
+		columns=Table::columns_type(0); // nameless
 	} else {
-		columns=new(pool) Array(pool);
+		columns=Table::columns_type(new ArrayString);
 
-		if(char *row_chars=getrow(&data)) 
+		while(char *row_chars=getrow(&data)) {
+			// remove empty&comment lines
+			if(!*row_chars || *row_chars == '#')
+				continue;
 			do {
-				String *name=new(pool) String(pool);
-				name->APPEND(lsplit(&row_chars, '\t'), 0, file, line++);
+				StringPtr name(new String);
+				name->APPEND_TAINTED(lsplit(&row_chars, '\t'), 0, file, line++);
 				*columns+=name;
 			} while(row_chars);
+
+			break;
+		}
 	}
 
 	// parse cells
-	Table& table=*new(pool) Table(pool, method_name, columns);
+	TablePtr table(new Table(method_name, columns));
 	char *row_chars;
 	while(row_chars=getrow(&data)) {
-		Array *row=new(pool) Array(pool);
+		// remove empty&comment lines
+		if(!*row_chars || *row_chars == '#')
+			continue;
+		Table::element_type row(new ArrayString);
 		while(char *cell_chars=lsplit(&row_chars, '\t')) {
-			String *cell=new(pool) String(pool);
-			cell->APPEND(cell_chars, 0, file, line);
+			StringPtr cell(new String);
+			cell->APPEND_TAINTED(cell_chars, 0, file, line);
 			*row+=cell;
 		}
+#ifndef NO_STRING_ORIGIN
 		line++;
-		table+=row;
+#endif
+		*table+=row;
 	};
 
 	// replace any previous table value
-	r.self->as_vtable().set_table(table);
+	GET_SELF(r, VTable).set_table(table);
+}
+
+/// @todo "x\nx" "xxx""xx"
+static void _save(Request& r, StringPtr method_name, MethodParams& params) {
+	Pool& pool=r.pool();
+	ValuePtr vfile_name=params.as_no_junction(params.count()-1, 
+		"file name must not be code");
+
+	Table& table=GET_SELF(r, VTable).table(method_name);
+
+	bool do_append=false;
+	String sdata;
+	if(params.count()==1) { // named output
+		// write out names line
+		if(table.columns()) { // named table
+			Array_iterator<StringPtr> i(*table.columns());
+			while(i.has_next()) {
+				sdata.append(*i.next(), String::UL_TABLE);
+				if(i.has_next())
+					sdata.APPEND_CONST("\t");
+			}
+		} else { // nameless table
+			if(int lsize=table.count()?table[0]->count():0)
+				for(int column=0; column<lsize; column++) {
+					char *cindex_tab=(char *)pool.malloc(MAX_NUMBER);
+					snprintf(cindex_tab, MAX_NUMBER, "%d\t", column);
+					sdata.APPEND_CONST(cindex_tab);
+				}
+			else
+				sdata.APPEND_CONST("empty nameless table");
+		}
+		sdata.APPEND_CONST("\n");
+	} else { // mode specified
+		StringPtr  mode=params.as_string(0, "mode must be string");
+		if(*mode=="append")
+			do_append=true;
+		else if(*mode=="nameless")
+			/*ok, already skipped names output*/;
+		else
+			throw Exception("parser.runtime",
+				mode,
+				"unknown mode, must be 'append'");
+
+	}
+	// data lines
+	Array_iterator<ArrayStringPtr> i(table);
+	while(i.has_next()) {
+		Array_iterator<StringPtr> c(*i.next());
+		while(c.has_next()) {
+			if(StringPtr s=c.next())
+				sdata.append(*s, String::UL_TABLE);
+			if(c.has_next())
+				sdata.APPEND_CONST("\t");
+		}
+		sdata.APPEND_CONST("\n");
+	}
+
+	// write
+	file_write(r.absolute(vfile_name->as_string(&pool)), 
+		sdata.cstr(), sdata.size(), true, do_append);
+}
+
+static void _count(Request& r, StringPtr method_name, MethodParams& ) {
+	int result=GET_SELF(r, VTable).table(method_name).count();
+	r.write_no_lang(ValuePtr(new VInt(result)));
+}
+
+static void _line(Request& r, StringPtr method_name, MethodParams& ) {
+	int result=1+GET_SELF(r, VTable).table(method_name).current();
+	r.write_no_lang(ValuePtr(new VInt(result)));
+}
+
+static void _offset(Request& r, StringPtr method_name, MethodParams& params) {
+	Pool& pool=r.pool();
+	Table& table=GET_SELF(r, VTable).table(method_name);
+	if(params.count()) {
+		bool absolute=false;
+		if(params.count()>1) {
+		    StringPtr  whence=params.as_string(0, "whence must be string");
+		    if(*whence=="cur")
+				absolute=false;
+		    else if(*whence=="set")
+				absolute=true;
+		    else
+				throw Exception("parser.runtime",
+					whence,
+					"is invalid whence, valid are 'cur' or 'set'");
+		}
+		
+		ValuePtr offset_expr=params.as_junction(params.count()-1, "offset must be expression");
+		table.offset(absolute, r.process_to_value(offset_expr)->as_int());
+	} else
+		r.write_no_lang(ValuePtr(new VInt(table.current())));
+}
+
+static void _menu(Request& r, StringPtr method_name, MethodParams& params) {
+	ValuePtr body_code=params.as_junction(0, "body must be code");
+	
+	ValuePtr delim_maybe_code=params.count()>1?params[1]:ValuePtr(0);
+
+	Table& table=GET_SELF(r, VTable).table(method_name);
+	bool need_delim=false;
+	int saved_current=table.current();
+	int size=table.count();
+	for(int row=0; row<size; row++) {
+		table.set_current(row);
+
+		StringOrValue sv_processed=r.process(body_code);
+		StringPtr s_processed=sv_processed.get_string();
+		if(delim_maybe_code && s_processed && s_processed->size()) { // delimiter set and we have body
+			if(need_delim) // need delim & iteration produced string?
+				r.write_pass_lang(r.process(delim_maybe_code));
+			need_delim=true;
+		}
+		r.write_pass_lang(sv_processed);
+	}
+	table.set_current(saved_current);
+}
+
+#ifndef DOXYGEN
+struct Row_info {
+	Request *r;
+	Table *table;
+	ValuePtr key_code;
+	int key_field;
+	Array<int>* value_fields;
+	HashStringValue* hash;
+	bool distinct;
+	int row;
+};
+#endif
+static void table_row_to_hash(Table::element_type row, Row_info *info) {
+	Pool& pool=info->r->pool();
+
+	StringPtr key;
+	if(info->key_code) {
+		info->table->set_current(info->row++); // change context row
+		StringOrValue sv_processed=info->r->process(info->key_code);
+		key=sv_processed.as_string(&pool);
+	} else
+		key=info->key_field<row->count()?row->get(info->key_field):StringPtr(0);
+
+	if(!key)
+		return; // ignore rows without key [too-short-record_array if-indexed]
+		
+	VHashPtr vhash(new VHash);
+	HashStringValue& hash=vhash->hash();
+	for(int i=0; i<info->value_fields->count(); i++) {
+		int value_field=info->value_fields->get(i);
+		if(value_field<row->count())
+			hash.put(
+				info->table->columns()->get(value_field), 
+				ValuePtr(new VString(row->get(value_field))));
+	}
+
+	if(info->hash->put_dont_replace(key, vhash)) // put. existed?
+		if(!info->distinct)
+			throw Exception("parser.runtime",
+				key,
+				"duplicate key");
+}
+static void _hash(Request& r, StringPtr method_name, MethodParams& params) {
+	Pool& pool=r.pool();
+	Table& self_table=GET_SELF(r, VTable).table(method_name);
+	VHashPtr result(new VHash);
+	if(Table::columns_type columns=self_table.columns())
+		if(columns->count()>0) {
+			bool distinct=false;
+			int param_index=params.count()-1;
+			if(param_index>0) {
+				if(HashStringValue* options=
+					params.as_no_junction(param_index, "param must not be code")->get_hash(method_name)) {
+					--param_index;
+					int valid_options=0;
+					if(ValuePtr vdistinct=options->get(sql_distinct_name)) {
+						valid_options++;
+						distinct=r.process_to_value(vdistinct)->as_bool();
+					}
+					if(valid_options!=options->count())
+						throw Exception("parser.runtime",
+							method_name,
+							"called with invalid option");
+				}
+			}
+			if(param_index==2) // bad options param type
+				throw Exception("parser.runtime",
+					method_name,
+					"options must be hash");
+
+			Array<int> value_fields;
+			if(param_index>0) {
+				ValuePtr value_fields_param=params.as_no_junction(param_index, "value field(s) must not be code");
+				if(value_fields_param->is_string()) {
+					value_fields+=self_table.column_name2index(
+						value_fields_param->as_string(&pool), true);
+				} else if(Table* value_fields_table=value_fields_param->get_table()) {
+					for(int i=0; i<value_fields_table->count(); i++) {
+						StringPtr  value_field_name=
+							value_fields_table->get(i)->get(0);
+						value_fields+=self_table.column_name2index(value_field_name, true);
+					}
+				} else
+					throw Exception("parser.runtime",
+						method_name,
+						"value field(s) must be string or self_table"
+					);
+			} else { // by all columns, including key
+				for(int i=0; i<columns->count(); i++)
+					value_fields+=i;
+			}
+
+
+			{
+				Row_info info;
+				info.r=&r;
+				info.table=&self_table;
+				ValuePtr key_param=params[0];
+				info.key_code=key_param->get_junction()?key_param:ValuePtr(0);
+				info.key_field=info.key_code?-1
+					:self_table.column_name2index(key_param->as_string(&pool), true);
+				info.value_fields=&value_fields;
+				info.hash=&result->hash();
+				info.distinct=distinct;
+
+				int saved_current=self_table.current();
+				self_table.for_each(table_row_to_hash, &info);
+				self_table.set_current(saved_current);
+			}
+		}
+	r.write_no_lang(result);
+}
+
+#ifndef DOXYGEN
+struct Table_seq_item {
+	Table::element_type row;
+	union {
+		char *c_str;
+		double d;
+	} value;
+};
+#endif
+static int sort_cmp_string(const void *a, const void *b) {
+	return strcmp(
+		static_cast<const Table_seq_item *>(a)->value.c_str, 
+		static_cast<const Table_seq_item *>(b)->value.c_str
+	);
+}
+static int sort_cmp_double(const void *a, const void *b) {
+	double va=static_cast<const Table_seq_item *>(a)->value.d;
+	double vb=static_cast<const Table_seq_item *>(b)->value.d;
+	if(va<vb)
+		return -1;
+	else if(va>vb)
+		return +1;
+	else 
+		return 0;
+}
+static void _sort(Request& r, StringPtr method_name, MethodParams& params) {
+	Pool local_pool;
+	ValuePtr key_maker=params.as_junction(0, "key-maker must be code");
+
+	bool reverse=params.count()>1/*..[desc|asc|]*/?
+		reverse=*params.as_no_junction(1, "order must not be code")->as_string(&local_pool)=="desc":
+		false; // default=asc
+
+	Table& old_table=GET_SELF(r, VTable).table(method_name);
+	TablePtr new_table(new Table(method_name, old_table.columns()));
+
+	smart_ptr<Table_seq_item> seq(new Table_seq_item[old_table.count()]);
+	int i;
+
+	// calculate key values
+	bool key_values_are_strings=true;
+	for(i=0; i<old_table.count(); i++) {
+		old_table.set_current(i);
+		// calculate key value
+		seq[i].row=old_table[i];
+		ValuePtr value=r.process_to_value(key_maker)->as_expr_result(true/*return string as-is*/);
+		if(i==0) // determining key values type by first one
+			key_values_are_strings=value->is_string();
+
+		if(key_values_are_strings)
+			seq[i].value.c_str=value->as_string(&local_pool)->cstr(local_pool);
+		else
+			seq[i].value.d=value->as_double();
+	}
+	// sort keys
+	_qsort(seq, old_table.count(), sizeof(Table_seq_item), 
+		key_values_are_strings?sort_cmp_string:sort_cmp_double);
+
+	// reorder table as they require in 'seq'
+	for(i=0; i<old_table.count(); i++)
+		*new_table+=seq[reverse?old_table.count()-1-i:i].row;
+
+	// replace any previous table value
+	GET_SELF(r, VTable).set_table(new_table);
 }
 
+static bool _locate_expression(Request& r, StringPtr method_name, MethodParams& params) {
+	if(params.count()>1)
+		throw Exception("parser.runtime", 
+			method_name,
+			"locate by expression has only one parameter - expression");
+
+	ValuePtr expression_code=params.as_junction(0, "must be expression");
+
+	Table& table=GET_SELF(r, VTable).table(method_name);
+	int saved_current=table.current();
+	int size=table.count();
+	for(int row=0; row<size; row++) {
+		table.set_current(row);
 
-static void _set(Request& r, const String& method_name, Array *params) {
-	set_or_load(r, method_name, params, false);
+		if(r.process_to_value(expression_code)->as_bool())
+			return true;
+	}
+	table.set_current(saved_current);
+	return false;
+}
+static bool _locate_name_value(Request& r, StringPtr method_name, MethodParams& params) {
+	if(params.count()>2)
+		throw Exception("parser.runtime", 
+			method_name,
+			"locate by name and value has only two parameters - name and value");
+
+	Table& table=GET_SELF(r, VTable).table(method_name);
+	return table.locate(
+		params.as_string(0, "column name must be string"),
+		params.as_string(1, "value must be string")
+	);
+}
+static void _locate(Request& r, StringPtr method_name, MethodParams& params) {
+	Pool& pool=r.pool();
+	bool result=params[0]->get_junction()?
+		_locate_expression(r, method_name, params) :
+		_locate_name_value(r, method_name, params);
+	r.write_no_lang(ValuePtr(new VBool(result)));
 }
 
-static void _load(Request& r, const String& method_name, Array *params) {
-	set_or_load(r, method_name, params, true);
+static void _flip(Request& r, StringPtr method_name, MethodParams& params) {
+	Pool& pool=r.pool();
+	Table& old_table=GET_SELF(r, VTable).table(method_name);
+	TablePtr new_table(new Table(method_name, old_table.columns()));
+	if(old_table.count())
+		if(int old_cols=old_table[0]->count()) 
+			for(int column=0; column<old_cols; column++) {
+				Table::element_type new_row(new ArrayString(old_table.count()));
+				for(int i=0; i<old_table.count(); i++) {
+					Table::element_type old_row=old_table[i];
+					*new_row+=column<old_row->count()?old_row->get(column):StringPtr(new String);
+				}
+				*new_table+=new_row;
+			}
+
+	r.write_no_lang(ValuePtr(new VTable(new_table)));
 }
 
-void initialize_table_class(Pool& pool, VClass& vclass) {
-	// ^table.set[data]  ^table.set[nameless;data]
-	vclass.add_native_method("set", _set, 1, 2);
+static void _append(Request& r, StringPtr method_name, MethodParams& params) {
+	Pool& pool=r.pool();
+	// data
+	Temp_lang temp_lang(r, String::UL_PASS_APPENDED);
+	StringPtr string=r.process_to_string(params.as_junction(0, "body must be code"));
+
+	// parse cells
+	ArrayStringPtr row(new ArrayString);
+	string->split(*row, 0, "\t", 1, String::UL_AS_IS);
+
+	GET_SELF(r, VTable).table(method_name)+=row;
+}
+
+static void _join(Request& r, StringPtr method_name, MethodParams& params) {
+	Pool& pool=r.pool();
+
+	Table* maybe_src=params.as_no_junction(0, "table ref must not be code")->get_table();
+	if(!maybe_src)
+		throw Exception("parser.runtime", 
+			method_name, 
+			"source is not a table");
+
+	Table& src=*maybe_src;
+	Table& dest=GET_SELF(r, VTable).table(method_name);
+	if(&src == &dest)
+		throw Exception("parser.runtime", 
+			method_name, 
+			"source and destination are same table");
+
+	int offset, limit;
+	get_copy_options(r, method_name, params, 1, src, 
+		offset, limit);
+
+	if(Table::columns_type dest_columns=dest.columns()) { // dest is named
+		int saved_src_current=src.current();
+		int m=src.count()-offset;
+		if(!limit || limit>m)
+			limit=m;
+		int end=offset+limit;
+		for(int src_row=offset; src_row<end; src_row++) {
+			src.set_current(src_row);
+			Table::element_type dest_row(new ArrayString(src.count()));
+			for(int dest_column=0; dest_column<dest_columns->count(); dest_column++) {
+				StringPtr src_item=src.item(dest_columns->get(dest_column));
+				*dest_row+=src_item?src_item:StringPtr(new String);
+			}
+			dest+=dest_row;
+		}
+		src.set_current(saved_src_current);
+	} else { // dest is nameless
+		for(int src_row=0; src_row<src.count(); src_row++)
+			dest+=src[src_row];
+	}
+}
+
+#ifndef DOXYGEN
+class Table_sql_event_handlers: public SQL_Driver_query_event_handlers {
+	Pool& pool;
+	StringPtr  method_name;
+	StringPtr  statement_string; const char* statement_cstr;
+	ArrayStringPtr columns;
+	ArrayString* row;
+public:
+	TablePtr table;
+public:
+	Table_sql_event_handlers(Pool& apool, StringPtr amethod_name,
+		StringPtr astatement_string, const char* astatement_cstr) :
+		pool(apool), 
+		method_name(amethod_name),
+		statement_string(astatement_string),
+		statement_cstr(astatement_cstr),
+		columns(new ArrayString)
+	{}
+
+	bool add_column(SQL_Error& error, void *ptr, size_t size) {
+		try {
+			StringPtr column(new String);
+			column->APPEND_TAINTED(
+				(const char* )ptr, size, 
+				statement_cstr, 0);
+			*columns+=column;
+			return false;
+		} catch(...) {
+			error=SQL_Error("exception occured in Table_sql_event_handlers::add_column");
+			return true;
+		}
+	}
+	bool before_rows(SQL_Error& error) { 
+		try {
+			table=TablePtr(new Table( method_name, columns));
+			return false;
+		} catch(...) {
+			error=SQL_Error("exception occured in Table_sql_event_handlers::before_rows");
+			return true;
+		}
+	}
+	bool add_row(SQL_Error& error) {
+		try {
+			*table+=(ArrayStringPtr(row=new ArrayString));
+			return false;
+		} catch(...) {
+			error=SQL_Error("exception occured in Table_sql_event_handlers::add_row");
+			return true;
+		}
+	}
+	bool add_row_cell(SQL_Error& error, void *ptr, size_t size) {
+		try {
+			StringPtr cell(new String);
+			if(size)
+				cell->APPEND_TAINTED(
+					(const char* )ptr, size, 
+					statement_cstr, table->count()-1);
+			*row+=cell;
+			return false;
+		} catch(...) {
+			error=SQL_Error("exception occured in Table_sql_event_handlers::add_row_cell");
+			return true;
+		}
+	}
+};
+#endif
+static void _sql(Request& r, StringPtr method_name, MethodParams& params) {
+	Pool& pool=r.pool();
+
+	ValuePtr statement=params.as_junction(0, "statement must be code");
+
+	ulong limit=0;
+	ulong offset=0;
+	if(params.count()>1) {
+		ValuePtr voptions=params.as_no_junction(1, "options must be hash, not code");
+		if(!voptions->is_string())
+			if(HashStringValue* options=voptions->get_hash(method_name)) {
+				int valid_options=0;
+				if(ValuePtr vlimit=options->get(sql_limit_name)) {
+					valid_options++;
+					limit=(ulong)r.process_to_value(vlimit)->as_double();
+				}
+				if(ValuePtr voffset=options->get(sql_offset_name)) {
+					valid_options++;
+					offset=(ulong)r.process_to_value(voffset)->as_double();
+				}
+				if(valid_options!=options->count())
+					throw Exception("parser.runtime",
+						method_name,
+						"called with invalid option");
+			} else
+				throw Exception("parser.runtime",
+					method_name,
+					"options must be hash");
+	}
+
+	Temp_lang temp_lang(r, String::UL_SQL);
+	StringPtr  statement_string=r.process_to_string(statement);
+	const char* statement_cstr=
+		statement_string->cstr(pool, String::UL_UNSPECIFIED, r.connection(method_name));
+	Table_sql_event_handlers handlers(pool, method_name,
+		statement_string, statement_cstr);
+#ifdef RESOURCES_DEBUG
+	struct timeval mt[2];
+	//measure:before
+	gettimeofday(&mt[0],NULL);
+#endif	
+	r.connection(method_name)->query(
+		statement_cstr, offset, limit, 
+		handlers,
+		statement_string);
+	
+#ifdef RESOURCES_DEBUG
+		//measure:after connect
+	gettimeofday(&mt[1],NULL);
+	
+	double t[2];
+	for(int i=0;i<2;i++)
+	    t[i]=mt[i].tv_sec+mt[i].tv_usec/1000000.0;
+	    
+	r.sql_request_time+=t[1]-t[0];
+#endif	    			
+
+	TablePtr result=
+		handlers.table?handlers.table: // query resulted in table? return it
+		TablePtr(new Table(method_name, Table::columns_type(0))); // query returned no table, fake it
 
-	// ^table.load[data]  ^table.load[nameless;data]
-	vclass.add_native_method("load", _load, 1, 2);
-}	
+	// replace any previous table value
+	GET_SELF(r, VTable).set_table(result);
+}
+
+static void _columns(Request& r, StringPtr method_name, MethodParams& ) {
+	Pool& pool=r.pool();
+
+	Table::columns_type result_columns(new ArrayString);
+	*result_columns+=StringPtr(new String("column"));
+	TablePtr result_table(new Table(method_name, result_columns));
+
+	Table& source_table=GET_SELF(r, VTable).table(method_name);
+	if(Table::columns_type source_columns=source_table.columns()) {
+		Array_iterator<StringPtr> i(*source_columns);
+		while(i.has_next()) {
+			Table::element_type result_row(new ArrayString);
+			*result_row+=i.next();
+			*result_table+=result_row;
+		}
+	}
+
+	r.write_no_lang(ValuePtr(new VTable(result_table)));
+}
+
+static void _select(Request& r, StringPtr method_name, MethodParams& params) {
+	Pool& pool=r.pool();
+
+	ValuePtr vcondition=params.as_junction(0, "condition must be expression");
+
+	Table& source_table=GET_SELF(r, VTable).table(method_name);
+	TablePtr result_table(new Table(
+		source_table.origin_string(), 
+		source_table.columns()
+	));
+
+	int saved_current=source_table.current();
+	int size=source_table.count();
+	for(int row=0; row<size; row++) {
+		source_table.set_current(row);
+
+		bool condition=r.process_to_value(vcondition, 
+				/*0/*no name* /,*/
+				false/*don't intercept string*/)->as_bool();
+
+		if(condition) // ...condition is true=
+			*result_table+=source_table[row]; // =green light to go to result
+	}
+	source_table.set_current(saved_current);
+
+	r.write_no_lang(ValuePtr(new VTable(result_table)));
+}
+
+// constructor
+
+MTable::MTable(): Methoded("table") {
+	// ^table::create{data}
+	// ^table::create[nameless]{data}
+	// ^table::create[table]
+	add_native_method("create", Method::CT_DYNAMIC, _create, 1, 2);
+	// old name for compatibility with <= v 1.141 2002/01/25 11:33:45 paf
+	add_native_method("set", Method::CT_DYNAMIC, _create, 1, 2); 
+
+	// ^table::load[file]  
+	// ^table::load[nameless;file]
+	add_native_method("load", Method::CT_DYNAMIC, _load, 1, 3);
+
+	// ^table.save[file]  
+	// ^table.save[nameless;file]
+	add_native_method("save", Method::CT_DYNAMIC, _save, 1, 2);
+
+	// ^table.count[]
+	add_native_method("count", Method::CT_DYNAMIC, _count, 0, 0);
+
+	// ^table.line[]
+	add_native_method("line", Method::CT_DYNAMIC, _line, 0, 0);
+
+	// ^table.offset[]  
+	// ^table.offset(offset)
+	// ^table.offset[cur|set](offset)
+	add_native_method("offset", Method::CT_DYNAMIC, _offset, 0, 2);
+
+	// ^table.menu{code}  
+	// ^table.menu{code}[delim]
+	add_native_method("menu", Method::CT_DYNAMIC, _menu, 1, 2);
+
+	// ^table:hash[key field name]
+	// ^table:hash[key field name][value field name(s) string/table]
+	add_native_method("hash", Method::CT_DYNAMIC, _hash, 1, 3);
+
+	// ^table.sort{string-key-maker} ^table.sort{string-key-maker}[desc|asc]
+	// ^table.sort(numeric-key-maker) ^table.sort(numeric-key-maker)[desc|asc]
+	add_native_method("sort", Method::CT_DYNAMIC, _sort, 1, 2);
+
+	// ^table.locate[field;value]
+	add_native_method("locate", Method::CT_DYNAMIC, _locate, 1, 2);
+
+	// ^table.flip[]
+	add_native_method("flip", Method::CT_DYNAMIC, _flip, 0, 0);
+
+	// ^table.append{r{tab}e{tab}c{tab}o{tab}r{tab}d}
+	add_native_method("append", Method::CT_DYNAMIC, _append, 1, 1);
+
+	// ^table.join[table][$.limit(10) $.offset(1) $.offset[cur] ]
+	add_native_method("join", Method::CT_DYNAMIC, _join, 1, 2);
+
+
+	// ^table:sql[query]
+	// ^table:sql[query][$.limit(1) $.offset(2)]
+	add_native_method("sql", Method::CT_DYNAMIC, _sql, 1, 2);
+
+	// ^table:columns[]
+	add_native_method("columns", Method::CT_DYNAMIC, _columns, 0, 0);
+
+	// ^table.select(expression) = table
+	add_native_method("select", Method::CT_DYNAMIC, _select, 1, 1);
+}