--- parser3/src/classes/table.C	2020/12/14 20:58:15	1.352
+++ parser3/src/classes/table.C	2020/12/26 23:09:08	1.357
@@ -1,14 +1,12 @@
 /** @file
 	Parser: @b table parser class.
 
-	Copyright (c) 2001-2017 Art. Lebedev Studio (http://www.artlebedev.com)
+	Copyright (c) 2001-2020 Art. Lebedev Studio (http://www.artlebedev.com)
 	Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
 */
 
 #include "pa_config_includes.h"
 
-#define NO_STRINGSTREAM
-
 #if (!defined(NO_STRINGSTREAM) && !defined(FREEBSD4) && !defined(PA_DEBUG_DISABLE_GC))
 #include <sstream>
 #include "../lib/gc/include/gc_allocator.h"
@@ -27,7 +25,7 @@
 #include "pa_vbool.h"
 #include "pa_array.h"
 
-volatile const char * IDENT_TABLE_C="$Id: table.C,v 1.352 2020/12/14 20:58:15 moko Exp $";
+volatile const char * IDENT_TABLE_C="$Id: table.C,v 1.357 2020/12/26 23:09:08 moko Exp $";
 
 // class
 
@@ -1261,18 +1259,18 @@ static void join_nameless_row(Table& src
 	*dest+=src[src.current()];
 }
 static void _join(Request& r, MethodParams& params) {
-	Table& src=*params.as_table(0, "source");
-
-	Table::Action_options o=get_action_options(r, params, 1, src);
+	if(Table* src=params.as_table(0, "source")){
+		Table::Action_options o=get_action_options(r, params, 1, *src);
 
-	Table& dest=GET_SELF(r, VTable).table();
-	if(&src == &dest)
-		throw Exception(PARSER_RUNTIME, 0, "source and destination are same table");
-
-	if(dest.columns()) // dest is named
-		src.table_for_each(join_named_row, &dest, o);
-	else // dest is nameless
-		src.table_for_each(join_nameless_row, &dest, o);
+		Table& dest=GET_SELF(r, VTable).table();
+		if(src == &dest)
+			throw Exception(PARSER_RUNTIME, 0, "source and destination are same table");
+
+		if(dest.columns()) // dest is named
+			src->table_for_each(join_named_row, &dest, o);
+		else // dest is nameless
+			src->table_for_each(join_nameless_row, &dest, o);
+	}
 }
 
 #ifndef DOXYGEN
@@ -1503,6 +1501,42 @@ static void _select(Request& r, MethodPa
 	r.write(*new VTable(&result_table));
 }
 
+
+static void _rename(Request& r, MethodParams& params) {
+	const String* name_from=NULL;
+	const String* name_to=NULL;
+	HashStringValue* names=NULL;
+
+	if(params.count()>1){
+		name_from=&params.as_string(0, COLUMN_NAME_MUST_BE_STRING);
+		name_to=&params.as_string(1, COLUMN_NAME_MUST_BE_STRING);
+	} else
+		names=params.as_hash(0);
+
+	Table& table=GET_SELF(r, VTable).table();
+	if(Table::columns_type columns=table.columns()) {
+		if(names){
+			for(int i=0; i<columns->count(); i++) {
+				const String *column = columns->get(i);
+				if(Value* vto=names->get(*column)){
+					if(const String *sto=vto->get_string())
+						columns->put(i, sto);
+					else
+						throw Exception(PARSER_RUNTIME, column, COLUMN_NAME_MUST_BE_STRING);
+				}
+			}
+		} else if(name_from){
+			for(int i=0; i<columns->count(); i++) {
+				const String *column = columns->get(i);
+				if(*column == *name_from)
+					columns->put(i, name_to);
+			}
+		}
+		table.column_names_init();
+	} else
+		throw Exception(PARSER_RUNTIME, 0, "columns renaming is not supported for nameless tables");
+}
+
 // constructor
 
 MTable::MTable(): Methoded("table") {
@@ -1586,4 +1620,8 @@ MTable::MTable(): Methoded("table") {
 
 	// ^table.select(expression) = table
 	add_native_method("select", Method::CT_DYNAMIC, _select, 1, 2);
+
+	// ^table.rename[column name from;column name to] 
+	// ^table.rename[ $.[column name from][column name to] ... ]
+	add_native_method("rename", Method::CT_DYNAMIC, _rename, 1, 2);
 }