diff --git a/version2.0/nasal_enum.h b/version2.0/nasal_enum.h
index 9051872..d9331a3 100644
--- a/version2.0/nasal_enum.h
+++ b/version2.0/nasal_enum.h
@@ -159,6 +159,7 @@ enum parse_error_type
 	error_token_in_block,        // when a token should not be the begin of a statement in block
 
 	lack_semi,
+	lack_id,
 
 	definition_lack_id,          // lack identifier
 	definition_lack_equal,       // lack '=' when not getting ';'
@@ -206,6 +207,8 @@ void print_parse_error(int error_type,int line,int error_token_type=__stack_end)
 			break;
 		case lack_semi:
 			std::cout<<error_info_head<<line<<": expect a \';\' at the end of the statement."<<std::endl;break;
+		case lack_id:
+			std::cout<<error_info_head<<line<<": expect an identifier here."<<std::endl;break;
 		case definition_lack_id:
 			std::cout<<error_info_head<<line<<": expect identifier(s) after \'var\'."<<std::endl;break;
 		case definition_lack_equal:
@@ -254,7 +257,7 @@ void print_parse_error(int error_type,int line,int error_token_type=__stack_end)
 			std::cout<<"\' ."<<std::endl;
 			break;
 		case call_func_lack_comma:
-			std::cout<<error_info_head<<line<<": expect a \',\' here but get \'";
+			std::cout<<error_info_head<<line<<": expect a \',\' when calling a function but get \'";
 			print_parse_token(error_token_type);
 			std::cout<<"\' ."<<std::endl;
 			break;
diff --git a/version2.0/nasal_parse.h b/version2.0/nasal_parse.h
index fd08fba..ea87895 100644
--- a/version2.0/nasal_parse.h
+++ b/version2.0/nasal_parse.h
@@ -21,6 +21,7 @@ class nasal_parse
 		abstract_syntax_tree& get_root();
 		
 		// abstract_syntax_tree generation
+		bool check_multi_assignment();
 		bool check_comma_in_curve();
 		void main_generate();
 		void statements_block_generate(abstract_syntax_tree&);
@@ -136,6 +137,25 @@ abstract_syntax_tree& nasal_parse::get_root()
 	return root;
 }
 
+bool nasal_parse::check_multi_assignment()
+{
+	bool ret=false;
+	int cnt=0;
+
+	this->get_token();
+	++cnt;// get '('
+
+	this->get_token();
+	++cnt;
+	if(this_token.type==__id)
+	{
+
+	}
+	
+
+	return ret;
+}
+
 bool nasal_parse::check_comma_in_curve()
 {
 	// when generating multi_assignment
@@ -537,6 +557,8 @@ abstract_syntax_tree nasal_parse::multive_calculation()
 	abstract_syntax_tree calc_node;
 	abstract_syntax_tree tmp_node;
 	this->get_token();
+	// be careful that unary calculation and assignment cannot be used together
+	// such as: -a=1; this is incorrect use.
 	if((this_token.type==__sub_operator) || (this_token.type==__nor_operator))
 	{
 		calc_node.set_node_line(this_token.line);
@@ -546,7 +568,7 @@ abstract_syntax_tree nasal_parse::multive_calculation()
 		null_node.set_node_type(__number);
 		null_node.set_var_number("0");
 		calc_node.add_children(null_node);
-		calc_node.add_children(assign_calculation());
+		calc_node.add_children(scalar_generate());
 	}
 	else
 	{
@@ -571,7 +593,7 @@ abstract_syntax_tree nasal_parse::multive_calculation()
 			null_node.set_node_type(__number);
 			null_node.set_var_number("0");
 			calc_node.add_children(null_node);
-			calc_node.add_children(assign_calculation());
+			calc_node.add_children(scalar_generate());
 		}
 		else
 		{
@@ -676,8 +698,8 @@ abstract_syntax_tree nasal_parse::scalar_generate()
 					if(this_token.type==__colon)
 					{
 						scalar_para=false;
-						this->push_token();
-						this->push_token();
+						this->push_token();// colon
+						this->push_token();// identifier
 						while(this_token.type!=__right_curve)
 						{
 							abstract_syntax_tree special_para_node;
@@ -721,10 +743,12 @@ abstract_syntax_tree nasal_parse::scalar_generate()
 					}
 					else
 					{
-						this->push_token();
-						this->push_token();
+						this->push_token();// not colon
+						this->push_token();// identifier
 					}
 				}
+				else
+					this->push_token();// if not identifier then push in
 				if(scalar_para)
 					while(this_token.type!=__right_curve)
 					{
@@ -863,7 +887,7 @@ abstract_syntax_tree nasal_parse::hash_generate()
 			}
 			hash_member_node.add_children(calculation());
 			this->get_token();
-			if(this_token.type!=__comma && this_token.type!=__right_brace)
+			if((this_token.type!=__comma) && (this_token.type!=__right_brace))
 			{
 				++error;
 				print_parse_error(hash_gen_lack_end,this_token.line,this_token.type);
@@ -896,7 +920,7 @@ abstract_syntax_tree nasal_parse::vector_generate()
 		{
 			vector_node.add_children(calculation());
 			this->get_token();
-			if(this_token.type!=__comma && this_token.type!=__right_bracket)
+			if((this_token.type!=__comma) && (this_token.type!=__right_bracket))
 			{
 				++error;
 				print_parse_error(vector_gen_lack_end,this_token.line,this_token.type);
@@ -1096,7 +1120,9 @@ abstract_syntax_tree nasal_parse::loop_expr()
 	loop_main_node.set_node_type(this_token.type);
 	if(this_token.type==__for)
 	{
-		;
+		this->get_token();
+		if(this_token.type==__semi)
+			this->push_token();
 	}
 	else if(this_token.type==__while)
 	{
@@ -1116,7 +1142,44 @@ abstract_syntax_tree nasal_parse::loop_expr()
 	}
 	else
 	{
-		;
+		// forindex
+		// foreach
+		this->get_token();// '('
+		if(this_token.type!=__left_curve)
+		{
+			++error;
+			print_parse_error(lack_left_curve,this_token.line,this_token.type);
+		}
+		this->get_token();// 'var'
+		if(this_token.type!=__var)
+			this->push_token();
+		this->get_token();// id
+		if(this_token.type!=__id)
+		{
+			++error;
+			print_parse_error(lack_id,this_token.line);
+		}
+		else
+		{
+			abstract_syntax_tree id_node;
+			id_node.set_node_line(this_token.line);
+			id_node.set_node_type(__id);
+			id_node.set_var_name(this_token.str);
+			loop_main_node.add_children(id_node);
+		}
+		this->get_token();// ';'
+		if(this_token.type!=__semi)
+		{
+			++error;
+			print_parse_error(lack_semi,this_token.line);
+		}
+		loop_main_node.add_children(scalar_generate());// get hash/vector or keys(hash/vector)
+		this->get_token();
+		if(this_token.type!=__right_curve)
+		{
+			++error;
+			print_parse_error(lack_right_curve,this_token.line,this_token.type);
+		}
 	}
 	statements_block_generate(loop_main_node);
 	return loop_main_node;
diff --git a/version2.0/parse.ebnf b/version2.0/parse.ebnf
index e3303e2..7edb2c6 100644
--- a/version2.0/parse.ebnf
+++ b/version2.0/parse.ebnf
@@ -26,7 +26,6 @@
 |   <vector>
 |   <func> <id>
 |   <function>
-|   <assignment>
 |   '(' <calculation> ')'
 |   <scalar> { ('[' {<calculation> ','} ']') | ('[' <calculation> ':' [<calculation>] ']') | ('.' <id>) | ('(' {<calculation> ','} ')') | ('(' {<id> ':' <calculation> ','} ')') }
 ;
@@ -55,13 +54,9 @@
 <definition> =
     <var> <id> '=' <scalar>
 |   <var> '(' {<id> ','} ')' '=' (<scalar> | '(' {<scalar> ','} ')')
+|   '(' <var> {<id> ','} ')' '=' (<scalar> | '(' {<scalar> ','} ')')
 ;
-<forindex_loop_definition> =
-    <var> <id>
-;
-<foreach_loop_definition> =
-    <var> <id> 
-;
+
 <assignment> =
     <scalar> ('=' | '+=' | '-=' | '*=' | '/=' | '~=') <calculation>
 |   '(' {<scalar> ','} ')' ('=' | '+=' | '-=' | '*=' | '/=' | '~=') (<calculation> | '(' {<calculation> ','} ')')
@@ -82,12 +77,12 @@
 ;
 (* in forindex and foreach the scalar and definition cannot be lacked*)
 <forindex_loop> =
-    <forindex> '(' <forindex_loop_definition> ';' <scalar> ')' <statement> [';']
-|   <forindex> '(' <forindex_loop_definition> ';' <scalar> ')' '{' {<statement> ';'} '}'
+    <forindex> '(' (<var> <id>)|(<id>) ';' <scalar> ')' <statement> [';']
+|   <forindex> '(' (<var> <id>)|(<id>) ';' <scalar> ')' '{' {<statement> ';'} '}'
 ;
 <foreach_loop> =
-    <foreach> '(' <foreach_loop_definition> ';' <scalar> ')' <statement> [';']
-|   <foreach> '(' <foreach_loop_definition> ';' <scalar> ')' '{' {<statement> ';'} '}'
+    <foreach> '(' (<var> <id>)|(<id>) ';' <scalar> ')' <statement> [';']
+|   <foreach> '(' (<var> <id>)|(<id>) ';' <scalar> ')' '{' {<statement> ';'} '}'
 ;
 
 <choose_expr> = <choose_expr_if> {<choose_expr_elsif>} [<choose_expr_else>]
diff --git a/version2.0/test/choice.nas b/version2.0/test/choice.nas
new file mode 100644
index 0000000..f01c351
--- /dev/null
+++ b/version2.0/test/choice.nas
@@ -0,0 +1,28 @@
+
+var condition_true=1;
+var condition_false=0;
+if(condition_true)
+{
+    var a=1;
+}
+else if(!condition_false)
+{
+    var b=1;
+}
+elsif(!condition_true and condition_false)
+{
+    print("impossible");
+}
+else
+{
+    var c=1;
+}
+
+if(condition_true)
+    var a=1;
+else if(!condition_false)
+    var b=1;
+elsif(!condition_true and condition_false)
+    print("impossible");
+else
+    var c=1;
\ No newline at end of file
diff --git a/version2.0/test/final.nas b/version2.0/test/final.nas
new file mode 100644
index 0000000..ac5d13c
--- /dev/null
+++ b/version2.0/test/final.nas
@@ -0,0 +1,210 @@
+var smartScreen = canvas.new({
+  "name": "smartScreen",   # The name is optional but allow for easier identification
+  "size": [2048, 2048], # Size of the underlying texture (should be a power of 2, required) [Resolution]
+  "view": [768, 768],  # Virtual resolution (Defines the coordinate system of the canvas [Dimensions]
+                        # which will be stretched the size of the texture, required)
+  "mipmapping": 1       # Enable mipmapping (optional)
+});
+
+smartScreen.addPlacement({"node": "screen", "texture": "screen.jpeg"});
+var group = smartScreen.createGroup();
+
+# Create a text element and set some values
+var text = group.createChild("text", "optional-id-for element")
+          .setTranslation(10, 20)      # The origin is in the top left corner
+          .setAlignment("left-center") # All values from osgText are supported (see $FG_ROOT/Docs/README.osgtext)
+          .setFont("LiberationFonts/LiberationSans-Regular.ttf") # Fonts are loaded either from $AIRCRAFT_DIR/Fonts or $FG_ROOT/Fonts
+          .setFontSize(14, 1.2)        # Set fontsize and optionally character aspect ratio
+          .setColor(1,0,0)             # Text color
+          .setText("This is a text element");
+text.hide();
+text.setText("SELF TEST NORMAL").show();
+
+
+
+var ui_root = smartScreen.createGroup();
+var vbox = canvas.VBoxLayout.new();
+smartScreen.setLayout(vbox);
+
+
+var button_onl = canvas.gui.widgets.Button.new(ui_root, canvas.style, {}).setText("Online OSM").listen("clicked", func showOnlineMap());
+var button_offl = canvas.gui.widgets.Button.new(ui_root, canvas.style, {}).setText("Offline OSM").listen("clicked", func showOfflineMap());
+button_onl.setSizeHint([32, 128]);
+button_offl.setSizeHint([32, 128]);
+
+var label = canvas.gui.widgets.Label.new(ui_root, canvas.style, {});
+
+var button_box = canvas.HBoxLayout.new();
+button_box.addItem(button_onl);
+button_box.addItem(button_offl);
+button_box.addItem(label);
+button_box.addStretch(1);
+
+vbox.addItem(button_box);
+vbox.addStretch(1);
+
+
+var showOnlineMap = func(){
+  TestMap.show();
+  g.hide();
+  label.setText("Online Mode");
+}
+
+
+var showOfflineMap = func(){
+  TestMap.hide();
+  g.show();
+  label.setText("Offline Mode");
+}
+
+
+# Online Map using MapStructure
+var TestMap = smartScreen.createGroup().createChild("map");
+TestMap.setTranslation(smartScreen.get("view[0]")/2,smartScreen.get("view[1]")/2);
+
+
+var ctrl_ns = canvas.Map.Controller.get("Aircraft position");
+var source = ctrl_ns.SOURCES["map-dialog"];
+if (source == nil) {
+  # TODO: amend
+  var source = ctrl_ns.SOURCES["map-dialog"] = {
+    getPosition: func subvec(geo.aircraft_position().latlon(), 0, 2),# ? ? ?
+    getAltitude: func getprop('/position/altitude-ft'),
+    getHeading:  func {
+      if (me.aircraft_heading)
+        getprop('/orientation/heading-deg');
+      else
+        0;
+    },
+    aircraft_heading: 1,
+  };
+}
+setlistener("/sim/gui/dialogs/map-canvas/aircraft-heading-up", func(n){source.aircraft_heading = n.getBoolValue();}, 1);
+TestMap.setController("Aircraft position", "map-dialog");
+TestMap.setRange(1); 
+
+var r = func(name,vis=1,zindex=nil){return caller(0)[0];};
+# TODO: we'll need some z-indexing here, right now it's just random
+
+foreach(var type; [r('APS')] ){
+    TestMap.addLayer(factory: canvas.SymbolLayer, type_arg: type.name, visible: type.vis, priority: 2);
+}
+
+foreach(var type; [ r('OSM')]) {
+    TestMap.addLayer(factory: canvas.OverlayLayer,
+                    type_arg: type.name,
+                     visible: type.vis,
+                    priority: 1);
+}
+
+
+TestMap.hide();
+
+# Offline map
+
+var g = smartScreen.createGroup();
+var zoom = 15;
+var type = "intl";
+var tile_size = 256;
+
+
+var changeZoom = func(d)
+{
+  zoom = math.max(2, math.min(19, zoom + d));
+  updateTiles();
+}
+
+# http://polymaps.org/docs/
+# https://github.com/simplegeo/polymaps
+# https://github.com/Leaflet/Leaflet
+
+var maps_base = getprop("/sim/fg-home") ~ '/cache/maps';
+
+var makePath =
+string.compileTemplate(maps_base ~ '/osm-{type}/{z}/{x}/{y}.jpg');
+var num_tiles = [4, 4];
+
+var center_tile_offset = [(num_tiles[0]-1)/2, (num_tiles[1]-1)/ 2];
+
+# simple aircraft icon at current position/center of the map
+g.createChild("path")
+  .moveTo( tile_size*center_tile_offset[0]-10, tile_size*center_tile_offset[1])
+  .horiz(20)
+  .move(-10,-10)
+  .vert(20)
+  .set("stroke", "red")
+  .set("stroke-width", 2)
+  .set("z-index", 1);
+
+# initialize the map by setting up
+# a grid of raster images  
+
+var tiles = setsize([], num_tiles[0]);
+for(var x=0; x<num_tiles[0]; x+=1)
+{
+  tiles[x] = setsize([], num_tiles[1]);
+  for(var y=0; y<num_tiles[1]; y+=1)
+    tiles[x][y] = g.createChild("image", "map-tile");
+}
+
+var last_tile = [-1,-1];
+var last_type = type;
+
+# this is the callback that will be regularly called by the timer
+# to update the map
+var updateTiles = func()
+{
+  # get current position
+  var lat = getprop('/position/latitude-deg');
+  var lon = getprop('/position/longitude-deg');
+
+  var n = math.pow(2, zoom);
+  var offset = [n*((lon+180)/360)-center_tile_offset[0], (1-math.ln(math.tan(lat*math.pi/180)+1/math.cos(lat*math.pi/180))/math.pi)/2*n-center_tile_offset[1]];
+  var tile_index = [int(offset[0]), int(offset[1])];
+
+  var ox = tile_index[0] - offset[0];
+  var oy = tile_index[1] - offset[1];
+
+  for(var x = 0; x < num_tiles[0]; x += 1)
+    for(var y = 0; y < num_tiles[1]; y += 1)
+      tiles[x][y].setTranslation(int((ox + x) * tile_size + 0.5), int((oy + y) * tile_size + 0.5));
+
+  if(  tile_index[0] != last_tile[0]
+    or tile_index[1] != last_tile[1]
+    or type != last_type )
+  {
+    for(var x = 0; x < num_tiles[0]; x += 1)
+      for(var y = 0; y < num_tiles[1]; y += 1)
+      {
+        var pos = {
+          z: zoom,
+          x: int(offset[0] + x),
+          y: int(offset[1] + y),
+          type: type
+        };
+
+        (func {
+            var img_path = makePath(pos);
+            var tile = tiles[x][y];
+            print('loading ' ~ img_path);
+            tile.set("src", img_path);
+          })();
+        # lambda
+      }
+
+      last_tile = tile_index;
+      last_type = type;
+  }
+};
+
+# set up a timer that will invoke updateTiles at 2-second intervals
+var update_timer = maketimer(2, updateTiles);
+# actually start the timer
+update_timer.start();
+
+# set up default zoom level
+changeZoom(0);
+
+#g.hide();
+
+
diff --git a/version2.0/test/loop.nas b/version2.0/test/loop.nas
new file mode 100644
index 0000000..b8d6228
--- /dev/null
+++ b/version2.0/test/loop.nas
@@ -0,0 +1,30 @@
+for(;;)break;
+for(;;)
+{
+    var a=1;
+    break;
+}
+for(var i=1;;)break;
+for(var i=1;;i+=1)break;
+for(var i=1;i<10;i+=1)print(i);
+
+while(1)break;
+var j=0;
+while(j<10)
+{
+    print(j);
+    j+=1;
+}
+
+forindex(var j;[0,1,2,3])print(j);
+forindex(var j;[0,1,2,3])
+{
+    var a=j;
+    print(a*a);
+}
+foreach(var j;[0,1,2,3])print([0,1,2,3][j]);
+foreach(var j;[0,1,2,3])
+{
+    var a=[0,1,2,3][j];
+    print(a*a-1);
+}
diff --git a/version2.0/test/scalar.nas b/version2.0/test/scalar.nas
new file mode 100644
index 0000000..979d1ed
--- /dev/null
+++ b/version2.0/test/scalar.nas
@@ -0,0 +1,116 @@
+# basic type
+nil;
+2147483647;
+0x7fffffff;
+0xdeadbeef;
+0o70120327;
+"hello world!";
+'hello world!';
+-12;
+!0;
+-((30));
+[];
+{};
+[0,1,2,3,4,5][2];       # 2
+([0,1,2,3,4])[2];       # 2
+[0,1,2,3,4,5][5,4,3,2+1][0:2][0]; # 5
+{str:"hello"}.str;      # "hello"
+{str:"hello"}["str"];   # "hello"
+{"str":"hello\"\"\n"}["str"]; # "hello"
+20? 1:0;
+
+# normal scalar
+var number_1=1;
+var number_2=0xdeadbeef;
+var number_3=0x13702;
+var number_4=0.12341490239423;
+var string_1="hello";
+var string_2='hello';
+var string_3=number_1? 'yes':'no'; # yes
+
+# vector
+var vector_1=[];
+var vector_2=[0,1,2,"str",number_1,vector_1];
+var vector_3=vector_2[-3,-1];
+var vector_4=vector_2[0:3];
+var vector_5=vector_2[3:];
+
+# hash
+var hash_1={};
+var hash_2={str1:'str1', str2:'str2', num1:0x7fffffff};
+var hash_3={
+ "member_1":1,
+ "member_2":2,
+ "member_3":3,
+};
+var hash_4={
+ mem_1:hash_1,
+ mem_2:hash_2.num1, # also this can be written as hash_2["num1"]
+ mem_3:hash_3["member_1"]
+};
+
+# function
+var func_1=func(){return 1;}
+var prt=func(x){print(x);return nil;}
+var func_with_dynamic_id=func(a,b,c,d...){return [a,b,c,d];}
+var func_with_lack_para=func(a,b,c=1,d=2){return a+b+c+d;}
+var func_with_func_para=func(a,f){return f(a);}
+
+func_with_lack_para(a:1, b:2, c:3, d:4);
+func_with_lack_para(b:1, c:3, a:4, d:1);
+func_with_func_para(f:func prt,a:1);
+func_with_func_para(func func_1(),func(x){return x;});
+func_with_func_para(func_1(),func_1);
+prt(func func_1());
+var test_func_ret_number_1=func func_1(); # 1
+var test_func_ret_number_2=func_1();      # 1
+
+var source={
+ member_1: func func_1(),         # this will get a number
+ member_2: func {return 2.71828;} # this will get a function
+};
+print(source['member_2']());
+print(source.member_2());
+
+var test_func=func{return 1;}
+print(func test_func());       # 1
+print(test_func());            # 1
+print(func test_func);         # nothing
+print(test_func);              # nothing
+print(([0,1,2,3])[1]);         # 1
+print(({str:"what?"})["str"]); # what?
+print(({str:"what?"}).str);    # what?
+
+# lambda
+(func(x){return x>0? x:0;})(12);
+(func{print("hello world");})();
+(((func(x){return 1.0/math.exp(x);})))(0);
+
+# flexible definition & assignment
+var (r,g,b)=[0x00,0x10,0xff];
+(var r,g,b)=[0x00,0x10,0xff];
+var color=[0x00,0x10,0xff];
+var (r,g,b)=color;
+(var r,g,b)=color;
+(r,g,b)=(b,g,r);
+(number_1,number_2)=(number_2,number_1);
+
+# calculation
+1+1;
+1+1-2+3-4+5-6;
+1+1*8-9/3;
+1*-1;
+1*(1+2*(3+4*(5+6*(7+8*(9+10/(1+1))))));
+((-1*2+9))/7-1;
+((({num:2})))["num"]*2*2*2;
+((((([0,1,2])[0:2]))[0:2]))[1]-1;
+(((((((((((((((((((1+1+2+3+5)+8))+13)))+21))))+34)))))+55))))*89;
+number_1*(number_2+number_3)/90-number_4;
+(func test_func)()-1;
+hash_3.member_3+(func {return {what:"i don't tell you.",case_small:80,case_large:100}})["case_large"]/10;
+-1*10+5 or 10-10;
+nil and 1+7*8;
+(number_1 or number_2) and (number_3 or number_4-number_4*1);
+[0,1,4,3,2][4]*2-4+1*2*2*2*2*2/8;
+{num:0}.num or {what_is_the_secret_of_universe:42}["what_is_the_secret_of_universe"];
+"123"~"456"-123456*2/2;
\ No newline at end of file