--- parser3/src/main/compile.y	2001/03/06 17:03:18	1.58
+++ parser3/src/main/compile.y	2001/03/10 16:34:38	1.87
@@ -1,5 +1,9 @@
 /*
-  $Id: compile.y,v 1.58 2001/03/06 17:03:18 paf Exp $
+	Parser
+	Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
+	Author: Alexander Petrosyan <paf@design.ru>
+
+	$Id: compile.y,v 1.87 2001/03/10 16:34:38 paf Exp $
 */
 
 %{
@@ -20,9 +24,10 @@
 #include "pa_request.h"
 #include "pa_vobject.h"
 #include "pa_vdouble.h"
+#include "core.h"
 
-#define SELF_NAME "self"
-#define USES_NAME "USES"
+#define SELF_ELEMENT_NAME "self"
+#define USE_CONTROL_METHOD_NAME "USE"
 
 int real_yyerror(parse_control *pc, char *s);
 static void yyprint(FILE *file, int type, YYSTYPE value);
@@ -44,8 +49,9 @@ int yylex(YYSTYPE *lvalp, void *pc);
 
 %token BAD_STRING_COMPARISON_OPERATOR
 
-%token LOR "||"
 %token LAND "&&"
+%token LOR "||"
+%token LXOR "##"
 
 %token NLE "<="
 %token NGE ">="
@@ -59,16 +65,24 @@ int yylex(YYSTYPE *lvalp, void *pc);
 %token SEQ "eq"
 %token SNE "ne"
 
+%token DEF "def"
+%token IN "in"
+%token FEXISTS "-f"
+
 /* logical */
-%left '<' '>' "<=" ">="
+%left "lt" "gt" "le" "ge"
+%left "eq" "ne"
+%left '<' '>' "<=" ">=" "##"
 %left "==" "!="
 %left "||"
 %left "&&"
-%left NOT     /* not: unary ! */
+%left "def" "in" "-f"
+%left '!'
 
 /* bitwise */
+%left '#'
 %left '&' '|'
-%left INV     /* invertion: unary ~ */
+%left '~'
 
 /* numerical */
 %left '-' '+'
@@ -77,14 +91,14 @@ int yylex(YYSTYPE *lvalp, void *pc);
 
 %%
 
-all:
+all: /* TODO: у ^execute непременно задать какой-то name, см. 'RUN' */
 	one_big_piece {
-	String& name_main=*NEW String(POOL);
-	name_main.APPEND_CONST(MAIN_METHOD_NAME);
-	Array& param_names=*NEW Array(POOL);
-	Array& local_names=*NEW Array(POOL);
-	Method& method=*NEW Method(POOL, name_main, param_names, local_names, *$1);
-	PC->vclass->add_method(name_main, method);
+	Method& method=*NEW Method(POOL, 
+		*main_method_name, 
+		0, 0, /*min, max numbered_params_count*/
+		0/*param_names*/, 0/*local_names*/, 
+		$1/*parser_code*/, 0/*native_code*/);
+	PC->vclass->add_method(*main_method_name, method);
 }
 |	methods;
 
@@ -95,31 +109,53 @@ method: control_method | code_method;
 
 control_method: '@' STRING '\n' 
 				control_strings {
-	String& name=*SLA2S($2);
+	const String& command=*SLA2S($2);
 	YYSTYPE strings_code=$4;
 	if(strings_code->size()<1*2) {
 		strcpy(PC->error, "@");
-		strcat(PC->error, name.cstr());
+		strcat(PC->error, command.cstr());
 		strcat(PC->error, " is empty");
 		YYERROR;
 	}
-	if(name==CLASS_NAME) {
-		if(strings_code->size()==1*2) 
-			PC->vclass->set_name(*SLA2S(strings_code));
-		else {
+	if(command==CLASS_NAME) {
+		if(PC->vclass!=&PC->request->root_class) { // already changed from default?
+			strcpy(PC->error, "class already have a name '");
+			strncat(PC->error, PC->vclass->name().cstr(), 100);
+			strcat(PC->error, "'");
+			YYERROR;
+		}
+		if(strings_code->size()==1*2) {
+			// new class' name
+			const String *name=SLA2S(strings_code);
+			// creating the class
+			PC->vclass=NEW VClass(POOL);
+			PC->vclass->set_name(*name);
+			// defaulting base. may change with @BASE
+			PC->vclass->set_base(PC->request->root_class);
+			// append to request's classes
+			PC->request->classes_array()+=PC->vclass;
+			PC->request->classes().put(*name, PC->vclass);
+		} else {
 			strcpy(PC->error, "@"CLASS_NAME" must contain sole name");
 			YYERROR;
 		}
 	} else {
-		if(name==USES_NAME) {
+		if(command==USE_CONTROL_METHOD_NAME) {
 			for(int i=0; i<strings_code->size(); i+=2) {
-				String *file=SLA2S(strings_code, i);
-				file->APPEND_CONST(".p");
-				PC->request->use(file->cstr(), 0);
+				String file(*SLA2S(strings_code, i));
+				file.APPEND_CONST(".p");
+				PC->request->use(file.cstr());
+			}
+		} else if(command==BASE_NAME) {
+			if(PC->vclass->base()!=&PC->request->root_class) { // already changed from default?
+				strcpy(PC->error, "class already have a base '");
+				strncat(PC->error, PC->vclass->base()->name().cstr(), 100);
+				strcat(PC->error, "'");
+				YYERROR;
 			}
-		} else if(name==BASE_NAME) {
 			if(strings_code->size()==1*2) {
-				String& base_name=*SLA2S(strings_code);
+				// TODO: преодолеть self и циклические base
+				const String& base_name=*SLA2S(strings_code);
 				VClass *base=static_cast<VClass *>(
 					PC->request->classes().get(base_name));
 				if(!base) {
@@ -133,9 +169,9 @@ control_method: '@' STRING '\n'
 				YYERROR;
 			}
 		} else {
-			strcpy(PC->error, name.cstr());
+			strcpy(PC->error, command.cstr());
 			strcat(PC->error, ": invalid special name. valid names are "
-				CLASS_NAME", "USES_NAME" and "BASE_NAME);
+				CLASS_NAME", "USE_CONTROL_METHOD_NAME" and "BASE_NAME);
 			YYERROR;
 		}
 	}
@@ -149,16 +185,26 @@ code_method: '@' STRING bracketed_maybe_
 	const String *name=SLA2S($2);
 
 	YYSTYPE params_names_code=$3;
-	Array& params_names=*NEW Array(POOL);
-	for(int i=0; i<params_names_code->size(); i+=2)
-		params_names+=SLA2S(params_names_code, i);
+	Array *params_names=0;
+	if(int size=params_names_code->size()) {
+		params_names=NEW Array(POOL);
+		for(int i=0; i<size; i+=2)
+			*params_names+=SLA2S(params_names_code, i);
+	}
 
 	YYSTYPE locals_names_code=$4;
-	Array& locals_names=*NEW Array(POOL);
-	for(int i=0; i<locals_names_code->size(); i+=2)
-		locals_names+=SLA2S(locals_names_code, i);
+	Array *locals_names=0;
+	if(int size=locals_names_code->size()) {
+		locals_names=NEW Array(POOL);
+		for(int i=0; i<size; i+=2)
+			*locals_names+=SLA2S(locals_names_code, i);
+	}
 
-	Method& method=*NEW Method(POOL, *name, params_names, locals_names, *$7);
+	Method& method=*NEW Method(POOL, 
+		*name, 
+		0, 0/*min,max numbered_params_count*/, 
+		params_names, locals_names, 
+		$7, 0);
 	PC->vclass->add_method(*name, method);
 };
 
@@ -177,16 +223,17 @@ codes: code | codes code {
 	$$=$1; 
 	P($$, $2);
 };
-code: write_str_literal | action;
+code: write_string | action;
 action: get | put | with | call;
 
 /* get */
 
-get: '$' get_name {
-	$$=$2; /* stack: resulting value */
-	O($$, OP_WRITE); /* value=pop; write(value) */
+get: get_value {
+	$$=$1; /* stack: resulting value */
+	O($$, OP_WRITE); /* value=pop; wcontext.write(value) */
 };
-get_name: name_without_curly_rdive EON | name_in_curly_rdive;
+get_value: '$' get_name_value { $$=$2 }
+get_name_value: name_without_curly_rdive EON | name_in_curly_rdive;
 name_in_curly_rdive: '{' name_without_curly_rdive '}' { $$=$2 };
 name_without_curly_rdive: 
 	name_without_curly_rdive_read 
@@ -195,8 +242,8 @@ name_without_curly_rdive:
 name_without_curly_rdive_read: name_without_curly_rdive_code {
 	$$=N(POOL); 
 	Array *diving_code=$1;
-	String *first_name=SLA2S(diving_code);
-	if(first_name && *first_name==SELF_NAME) {
+	const String *first_name=SLA2S(diving_code);
+	if(first_name && *first_name==SELF_ELEMENT_NAME) {
 		O($$, OP_WITH_SELF); /* stack: starting context */
 		P($$, diving_code, 
 			/* skip over... */
@@ -217,10 +264,9 @@ name_without_curly_rdive_code: name_adva
 
 /* put */
 
-put: '$' name_expr_wdive constructor_value {
+put: '$' name_expr_wdive construct {
 	$$=$2; /* stack: context,name */
 	P($$, $3); /* stack: context,name,constructor_value */
-	O($$, OP_CONSTRUCT); /* value=pop; name=pop; context=pop; construct(context,name,value) */
 };
 name_expr_wdive: 
 	name_expr_wdive_write
@@ -229,8 +275,8 @@ name_expr_wdive:
 name_expr_wdive_write: name_expr_dive_code {
 	$$=N(POOL);
 	Array *diving_code=$1;
-	String *first_name=SLA2S(diving_code);
-	if(first_name && *first_name==SELF_NAME) {
+	const String *first_name=SLA2S(diving_code);
+	if(first_name && *first_name==SELF_ELEMENT_NAME) {
 		O($$, OP_WITH_SELF); /* stack: starting context */
 		P($$, diving_code, 
 			/* skip over... */
@@ -248,9 +294,16 @@ name_expr_wdive_root: ':' name_expr_dive
 };
 name_expr_wdive_class: class_prefix name_expr_dive_code { $$=$1; P($$, $2) };
 
-constructor_value: 
-	'[' any_constructor_code_value ']' { $$=$2 }
-|	'(' any_expr ')' { $$=$2 }
+construct: construct_by_code | construct_by_expr;
+construct_by_code: '[' any_constructor_code_value ']' {
+	$$=$2; /* stack: context, name, value */
+	O($$, OP_CONSTRUCT_VALUE); /* value=pop; name=pop; context=pop; construct(context,name,value) */
+}
+;
+construct_by_expr: '(' any_expr ')' { 
+	$$=$2; /* stack: context, name, value */
+	O($$, OP_CONSTRUCT_EXPR); /* value=pop; name=pop; context=pop; construct(context,name,value) */
+}
 ;
 any_constructor_code_value: 
 	empty_string_value /* optimized $var[] case */
@@ -260,7 +313,7 @@ any_constructor_code_value:
 constructor_code_value: constructor_code {
 	$$=N(POOL); 
 	O($$, OP_CREATE_EWPOOL); /* stack: empty write context */
-	P($$, $1); /* some codes to that context */
+	P($$, $1); /* some code that writes to that context */
 	O($$, OP_REDUCE_EWPOOL); /* context=pop; stack: context.value() */
 };
 constructor_code: codes__excluding_sole_str_literal;
@@ -268,38 +321,58 @@ codes__excluding_sole_str_literal: actio
 
 /* call */
 
-call: '^' call_name store_params EON { /* ^field.$method{vasya} */
+call: call_value {
+	$$=$1; /* stack: value */
+	O($$, OP_WRITE); /* value=pop; wcontext.write(value) */
+};
+call_value: '^' call_name store_params EON { /* ^field.$method{vasya} */
 	$$=$2; /* with_xxx,diving code; stack: context,method_junction */
 	O($$, OP_GET_METHOD_FRAME); /* stack: context,method_frame */
 	P($$, $3); /* filling method_frame.store_params */
-	O($$, OP_CALL); /* method_frame=pop; ncontext=pop; call(ncontext,method_frame) */
+	O($$, OP_CALL); /* method_frame=pop; ncontext=pop; call(ncontext,method_frame) stack: value */
 };
 
 call_name: name_without_curly_rdive;
 
 store_params: store_param | store_params store_param { $$=$1; P($$, $2) };
-store_param: store_round_param | store_curly_param;
-store_round_param: '[' store_param_parts ']' {$$=$2};
-store_param_parts:
-	store_param_part
-|	store_param_parts ';' store_param_part { $$=$1; P($$, $3) }
+store_param: 
+	store_square_param
+|	store_round_param
+|	store_curly_param
 ;
+store_square_param: '[' store_code_param_parts ']' {$$=$2};
+store_round_param: '(' store_expr_param_parts ')' {$$=$2};
 store_curly_param: '{' maybe_codes '}' {
 	$$=N(POOL); 
 	PCA($$, $2);
-	O($$, OP_STORE_PARAM);
 };
-store_param_part: 
-	empty /* optimized () case */
-|	STRING { /* optimized (STRING) case */
+store_code_param_parts:
+	store_code_param_part
+|	store_code_param_parts ';' store_code_param_part { $$=$1; P($$, $3) }
+;
+store_expr_param_parts:
+	store_expr_param_part
+|	store_expr_param_parts ';' store_expr_param_part { $$=$1; P($$, $3) }
+;
+store_code_param_part: 
+	empty /* optimized [] case */
+|	STRING { /* optimized [STRING] case */
 	$$=$1;
 	O($$, OP_STORE_PARAM);
 }
-|	constructor_code_value { /* (something complex) */
+|	constructor_code_value { /* [something complex] */
 	$$=$1;
 	O($$, OP_STORE_PARAM);
 }
 ;
+store_expr_param_part: write_expr_value {
+	$$=N(POOL); 
+	PCA($$, $1);
+};
+write_expr_value: any_expr {
+	$$=$1;
+	O($$, OP_WRITE);
+};
 
 /* name */
 
@@ -354,16 +427,8 @@ subvar__get_write: '$' subvar_ref_name_r
 };
 
 class_prefix: STRING ':' {
-	String& name=*SLA2S($1);
-	VClass *vclass=static_cast<VClass *>(PC->request->classes().get(name));
-	if(!vclass) {
-		strcpy(PC->error, "'");
-		strcat(PC->error, name.cstr());
-		strcat(PC->error, "' class is undefined in call");
-		YYERROR;
-	}
-	//TODO: убрать зависимость от статических @USE, сделать имя, а не ссылку
-	$$=CL(vclass); // vclass
+	$$=$1; // stack: class name string
+	O($$, OP_GET_CLASS);
 };
 
 
@@ -381,129 +446,66 @@ with: '$' name_without_curly_rdive '{' c
 
 any_expr:
 	empty_double_value /* optimized $var() case */
-|	expr /* $var(something) */
+|	expr_value /* $var(something) */
 ;
+expr_value: expr {
+	if(($$=$1)->size()==2) // only one string literal in there?
+		change_string_literal_to_double_literal($$); // make that string literal Double
+};
 expr: 
-	number
-|	'-' expr %prec NEG {
-	$$=$2; // stack: operand
-	O($$, OP_NEG); // value=-operand; stack: value
-}
-|	'~' expr %prec INV {
-	$$=$2; // stack: operand
-	O($$, OP_INV); // value=~operand; stack: value
-}
-|	'!' expr %prec NOT {
-	$$=$2; // stack: operand
-	O($$, OP_NOT); // value=!operand; stack: value
-}
-/*todo: def in fexists*/
-|	expr '-' expr {
-	$$=$1; // stack: first operand
-	P($$, $3); // stack: first,second operands
-	O($$, OP_SUB); // value=first-second; stack: value
-}
-|	expr '+' expr {
-	$$=$1; // stack: first operand
-	P($$, $3); // stack: first,second operands
-	O($$, OP_ADD); // value=first+second; stack: value
-}
-|	expr '*' expr {
-	$$=$1; // stack: first operand
-	P($$, $3); // stack: first,second operands
-	O($$, OP_MUL); // value=first*second; stack: value
-}
-|	expr '/' expr {
-	$$=$1; // stack: first operand
-	P($$, $3); // stack: first,second operands
-	O($$, OP_DIV); // value=first/second; stack: value
-}
-|	expr '%' expr {
-	$$=$1; // stack: first operand
-	P($$, $3); // stack: first,second operands
-	O($$, OP_MOD); // value=first%second; stack: value
-}
-|	expr '&' expr {
-	$$=$1; // stack: first operand
-	P($$, $3); // stack: first,second operands
-	O($$, OP_BIN_AND); // value=first&second; stack: value
-}
-|	expr '|' expr {
-	$$=$1; // stack: first operand
-	P($$, $3); // stack: first,second operands
-	O($$, OP_BIN_OR); // value=first|second; stack: value
-}
-|	expr "&&" expr {
-	$$=$1; // stack: first operand
-	P($$, $3); // stack: first,second operands
-	O($$, OP_LOG_AND); // value=first&&second; stack: value
-}
-|	expr "||" expr {
-	$$=$1; // stack: first operand
-	P($$, $3); // stack: first,second operands
-	O($$, OP_LOG_OR); // value=first||second; stack: value
-}
-|	expr '<' expr {
-	$$=$1; // stack: first operand
-	P($$, $3); // stack: first,second operands
-	O($$, OP_NUM_LT); // value=first<second; stack: value
-}
-|	expr '>' expr {
-	$$=$1; // stack: first operand
-	P($$, $3); // stack: first,second operands
-	O($$, OP_NUM_GT); // value=first>second; stack: value
-}
-|	expr "<=" expr {
-	$$=$1; // stack: first operand
-	P($$, $3); // stack: first,second operands
-	O($$, OP_NUM_LE); // value=first<=second; stack: value
-}
-|	expr ">=" expr {
-	$$=$1; // stack: first operand
-	P($$, $3); // stack: first,second operands
-	O($$, OP_NUM_GE); // value=first>=second; stack: value
-}
-|	expr "==" expr {
-	$$=$1; // stack: first operand
-	P($$, $3); // stack: first,second operands
-	O($$, OP_NUM_EQ); // value=first==second; stack: value
-}
-|	expr "!=" expr {
-	$$=$1; // stack: first operand
-	P($$, $3); // stack: first,second operands
-	O($$, OP_NUM_NE); // value=first!=second; stack: value
-}
-/*
-	OP_STR_LT, OP_STR_GT, OP_STR_LE, OP_STR_GE, OP_STR_EQ, OP_STR_NE
-*/
+	STRING
+|	get_value
+|	call_value
+|	'"' string_inside_quotes_value '"' { $$ = $2; }
 |	'(' expr ')' { $$ = $2; }
+/* stack: operand // stack: @operand */
+|	'-' expr %prec NEG { $$=$2;  O($$, OP_NEG) }
+|	'~' expr { $$=$2;	 O($$, OP_INV) }
+|	'!' expr { $$=$2;  O($$, OP_NOT) }
+|	"def" expr { $$=$2;  O($$, OP_DEF) }
+|	"in" expr { $$=$2;  O($$, OP_IN) }
+|	"-f" expr { $$=$2;  O($$, OP_FEXISTS) }
+/* stack: a,b // stack: a@b */
+|	expr '-' expr {	$$=$1;  P($$, $3);  O($$, OP_SUB) }
+|	expr '+' expr { $$=$1;  P($$, $3);  O($$, OP_ADD) }
+|	expr '*' expr { $$=$1;  P($$, $3);  O($$, OP_MUL) }
+|	expr '/' expr { $$=$1;  P($$, $3);  O($$, OP_DIV) }
+|	expr '%' expr { $$=$1;  P($$, $3);  O($$, OP_MOD) }
+|	expr '&' expr { $$=$1; 	P($$, $3);  O($$, OP_BIN_AND) }
+|	expr '|' expr { $$=$1;  P($$, $3);  O($$, OP_BIN_OR) }
+|	expr '#' expr { $$=$1;  P($$, $3);  O($$, OP_BIN_XOR) }
+|	expr "&&" expr { $$=$1;  P($$, $3);  O($$, OP_LOG_AND) }
+|	expr "||" expr { $$=$1;  P($$, $3);  O($$, OP_LOG_OR) }
+|	expr "##" expr { $$=$1;  P($$, $3);  O($$, OP_LOG_XOR) }
+|	expr '<' expr { $$=$1;  P($$, $3);  O($$, OP_NUM_LT) }
+|	expr '>' expr { $$=$1;  P($$, $3);  O($$, OP_NUM_GT) }
+|	expr "<=" expr { $$=$1;  P($$, $3);  O($$, OP_NUM_LE) }
+|	expr ">=" expr { $$=$1;  P($$, $3);  O($$, OP_NUM_GE) }
+|	expr "==" expr { $$=$1;  P($$, $3);  O($$, OP_NUM_EQ) }
+|	expr "!=" expr { $$=$1;  P($$, $3);  O($$, OP_NUM_NE) }
+|	expr "lt" expr { $$=$1;  P($$, $3);  O($$, OP_STR_LT) }
+|	expr "gt" expr { $$=$1;  P($$, $3);  O($$, OP_STR_GT) }
+|	expr "le" expr { $$=$1;  P($$, $3);  O($$, OP_STR_LE) }
+|	expr "ge" expr { $$=$1;  P($$, $3);  O($$, OP_STR_GE) }
+|	expr "eq" expr { $$=$1;  P($$, $3);  O($$, OP_STR_EQ) }
+|	expr "ne" expr { $$=$1;  P($$, $3);  O($$, OP_STR_NE) }
 ;
 
-/*
-complex_expr_value: complex_expr {
-	$$=N(POOL); 
-	O($$, OP_CREATE_SWPOOL); /* stack: empty write context * /
-	P($$, $1); /* some codes to that context * /
-	O($$, OP_REDUCE_SWPOOL); /* context=pop; stack: context.get_string() * /
+string_inside_quotes_value: maybe_codes {
+	$$=N(POOL);
+	O($$, OP_CREATE_SWPOOL); /* stack: empty write context */
+	P($$, $1); /* some code that writes to that context */
+	O($$, OP_REDUCE_SWPOOL); /* context=pop; stack: context.get_string() */
 };
-*/
 
 /* basics */
 
-write_str_literal: STRING {
-	if(SLA2S($1)->size()) {
-		$$=$1;
-		O($$, OP_WRITE);
-	} else {
-		// optimized case of special end of macro. see yylex
-		$$=N(POOL);
-	}
-};
-number: STRING {
-	change_string_literal_to_double_literal($$=$1);
+write_string: STRING {
+	// optimized from OP_STRING+OP_WRITE to OP_STRING__WRITE
+	change_string_literal_to_write_string_literal($$=$1)
 };
 
-empty_double_value: /* empty */ { $$=VL(NEW VDouble(POOL)) };
+empty_double_value: /* empty */ { $$=VL(NEW VDouble(POOL, 0)) };
 empty_string_value: /* empty */ { $$=VL(NEW VString(POOL)) };
 empty: /* empty */ { $$=N(POOL) };
 
@@ -541,7 +543,7 @@ int yylex(YYSTYPE *lvalp, void *pc) {
 	char *begin=PC->source;
 	char *end;
 	int begin_line=PC->line;
-	bool skip_analized_char=false;
+	int skip_analized=0;
 	while(true) {
 		c=*(end=(PC->source++));
 
@@ -551,6 +553,8 @@ int yylex(YYSTYPE *lvalp, void *pc) {
 		} else
 			PC->col++;
 
+		// todo: # in 0+1 column comment
+
 		// escaping: ^^ ^$ ^; ^) ^} ^( ^{ ^"
 		if(c=='^') 
 			switch(*PC->source) {
@@ -562,7 +566,7 @@ int yylex(YYSTYPE *lvalp, void *pc) {
 					// append piece till ^
 					PC->string->APPEND(begin, end-begin, PC->file, begin_line);
 				}
-				// reset piece 'start' position & line
+				// reset piece 'begin' position & line
 				begin=PC->source; // ^
 				begin_line=PC->line;
 				// skip over ^ and _
@@ -663,14 +667,18 @@ int yylex(YYSTYPE *lvalp, void *pc) {
 			break;
 
 		// (EXPRESSION)
-		case LS_EXPRESSION_BODY:
+		case LS_VAR_ROUND:
+		case LS_METHOD_ROUND:
 			switch(c) {
 			case ')':
 				if(--lexical_brackets_nestage==0)
-					pop_LS(PC); //(EXPRESSION).
+					if(PC->ls==LS_METHOD_ROUND) // method round param ended
+						PC->ls=LS_METHOD_AFTER; // look for method end
+					else // PC->ls==LS_VAR_ROUND // variable constructor ended
+						pop_LS(PC); // return to normal life
 				RC;
 			case '$':
-				push_LS(PC, LS_VAR_NAME_IN_EXPRESSION);				
+				push_LS(PC, LS_EXPRESSION_VAR_NAME);				
 				RC;
 			case '^':
 				push_LS(PC, LS_METHOD_NAME);
@@ -678,20 +686,27 @@ int yylex(YYSTYPE *lvalp, void *pc) {
 			case '(':
 				lexical_brackets_nestage++;
 				RC;
-			case '+': case '-': case '*': case '/': case '%': 
+			case '-':
+				if(*PC->source=='f') { // -f
+					skip_analized=1;
+					result=FEXISTS;
+				} else
+					result=c;
+				goto break2;
+			case '+': case '*': case '/': case '%': 
 			case '~':
 			case ';':
 				RC;
-			case '&': case '|': 
+			case '&': case '|':  case '#':
 				if(*PC->source==c) { // && ||
-					result='&'?LAND:LOR;
-					skip_analized_char=true;
+					result=c=='#'?LXOR:c=='&'?LAND:LOR;
+					skip_analized=1;
 				} else
 					result=c;
 				goto break2;
 			case '<': case '>': case '=': case '!': 
 				if(*PC->source=='=') { // <= >= == !=
-					skip_analized_char=true;
+					skip_analized=1;
 					switch(c) {
 					case '<': result=NLE; break;
 					case '>': result=NGE; break;
@@ -709,22 +724,43 @@ int yylex(YYSTYPE *lvalp, void *pc) {
 					switch(*PC->source) {
 //					case '?': // ok [and bad cases, yacc would bark at them]
 					case 't': // lt gt [et nt]
-						result=c=='l'?SLT:c=='g'?SGT:BAD_STRING_COMPARISON_OPERATOR; 
+						result=c=='l'?SLT:c=='g'?SGT:BAD_STRING_COMPARISON_OPERATOR;
+						skip_analized=1;
 						goto break2;
 					case 'e': // le ge ne [ee]
 						result=c=='l'?SLE:c=='g'?SGE:c=='n'?SNE:BAD_STRING_COMPARISON_OPERATOR;
+						skip_analized=1;
 						goto break2;
 					case 'q': // eq [lq gq nq]
 						result=c=='e'?SEQ:BAD_STRING_COMPARISON_OPERATOR;
+						skip_analized=1;
+						goto break2;
+					}
+				break;
+			case 'i':
+				if(end==begin) // right after whitespace
+					if(PC->source[0]=='n') { // in
+						skip_analized=1;
+						result=IN;
+						goto break2;
+					}
+				break;
+			case 'd':
+				if(end==begin) // right after whitespace
+					if(PC->source[0]=='e' && PC->source[1]=='f') { // def
+						skip_analized=2;
+						result=DEF;
 						goto break2;
 					}
 				break;
 			case ' ': case '\t': case '\n':
-				if(end!=begin) {
-					// append piece till whitespace char
-					PC->string->APPEND(begin, end-begin, PC->file, begin_line);
+				if(end!=begin) { // there were a string after previous operator?
+					result=0; // return that string
+					goto break2;
 				}
-				// reset piece 'start' position & line
+				// that's a leading|traling space or after-operator-space
+				// ignoring it
+				// reset piece 'begin' position & line
 				begin=PC->source; // after whitespace char
 				begin_line=PC->line;
 				continue;
@@ -733,13 +769,13 @@ int yylex(YYSTYPE *lvalp, void *pc) {
 
 		// VARIABLE GET/PUT/WITH
 		case LS_VAR_NAME_SIMPLE:
-		case LS_VAR_NAME_IN_EXPRESSION:
-			if(PC->ls==LS_VAR_NAME_IN_EXPRESSION) {
+		case LS_EXPRESSION_VAR_NAME:
+			if(PC->ls==LS_EXPRESSION_VAR_NAME) {
 				// name in expr ends also before binary operators 
 				switch(c) {
 				case '+': case '-': case '*': case '/': case '%': 
 				case '&': case '|': 
-				case '<': case '>': case '=': case '!':
+				case '=': case '!':
 					pop_LS(PC);
 					PC->source--;  if(--PC->col<0) { PC->line--;  PC->col=-1; }
 					result=EON;
@@ -750,7 +786,8 @@ int yylex(YYSTYPE *lvalp, void *pc) {
 			case 0:
 			case ' ': case '\t': case '\n':
 			case ';':
-			case ']': case '}':
+			case ']': case '}': case ')': case '"':
+			case '<': case '>':  // these stand for HTML brackets and expression binary ops
 				pop_LS(PC);
 				PC->source--;  if(--PC->col<0) { PC->line--;  PC->col=-1; }
 				result=EON;
@@ -766,10 +803,10 @@ int yylex(YYSTYPE *lvalp, void *pc) {
 					PC->ls=LS_VAR_CURLY;
 					lexical_brackets_nestage=1;
 				}
-				
+
 				RC;
 			case '(':
-				PC->ls=LS_EXPRESSION_BODY;
+				PC->ls=LS_VAR_ROUND;
 				lexical_brackets_nestage=1;
 				RC;
 			case '.': // name part delim
@@ -844,6 +881,10 @@ int yylex(YYSTYPE *lvalp, void *pc) {
 				PC->ls=LS_METHOD_CURLY;
 				lexical_brackets_nestage=1;
 				RC;
+			case '(':
+				PC->ls=LS_METHOD_ROUND;
+				lexical_brackets_nestage=1;
+				RC;
 			case '.': // name part delim 
 			case '$': // name part subvar
 			case ':': // ':name' or 'class:name'
@@ -894,16 +935,21 @@ int yylex(YYSTYPE *lvalp, void *pc) {
 			break;
 
 		case LS_METHOD_AFTER:
-			if(c=='[') {/* )( }( */
+			if(c=='[') {/* ][ }[ )[ */
 				PC->ls=LS_METHOD_SQUARE;
 				lexical_brackets_nestage=1;
 				RC;
 			}					   
-			if(c=='{') {/* ){ }{ */
+			if(c=='{') {/* ]{ }{ ){ */
 				PC->ls=LS_METHOD_CURLY;
 				lexical_brackets_nestage=1;
 				RC;
 			}					   
+			if(c=='(') {/* ]( }( )( */
+				PC->ls=LS_METHOD_ROUND;
+				lexical_brackets_nestage=1;
+				RC;
+			}					   
 			pop_LS(PC);
 			PC->source--;  if(--PC->col<0) { PC->line--;  PC->col=-1; }
 			result=EON;
@@ -916,14 +962,17 @@ int yylex(YYSTYPE *lvalp, void *pc) {
 	}
 
 break2:
-	if(end!=begin) {
-		// strip last \n before LS_DEF_NAME or EOF
-		if((c=='@' || c==0) && end[-1]=='\n')
+	if(end!=begin) { // there is last piece?
+		if((c=='@' || c==0) && end[-1]=='\n') { // we are before LS_DEF_NAME or EOF?
+			// strip last \n
 			end--;
-		if(end!=begin) {
-			// append last piece
+		}
+		if(end!=begin) { // last piece still alive?
+			// append it
 			PC->string->APPEND(begin, end-begin, PC->file, begin_line/*, start_col*/);
 		}
+	}
+	if(PC->string->size()) { // something accumulated?
 		// create STRING value: array of OP_VALUE+vstring
 		*lvalp=VL(NEW VString(*PC->string));
 		// new pieces storage
@@ -931,8 +980,8 @@ break2:
 		// make current result be pending for next call, return STRING for now
 		PC->pending_state=result;  result=STRING;
 	}
-	if(skip_analized_char) {
-		PC->source++;  PC->col++;
+	if(skip_analized) {
+		PC->source+=skip_analized;  PC->col+=skip_analized;
 	}
 	return result;
 }