--- parser3/src/main/compile.y	2001/03/06 12:57:30	1.50
+++ parser3/src/main/compile.y	2001/03/12 21:54:20	1.93
@@ -1,9 +1,24 @@
 /*
-  $Id: compile.y,v 1.50 2001/03/06 12:57:30 paf Exp $
+	Parser
+	Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
+	Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
+
+	$Id: compile.y,v 1.93 2001/03/12 21:54:20 paf Exp $
+*/
+
+/*
+	TODO.parser4: 
+		cache compiled code from request to request. to do that...
+		1:	make method definitions, @CLASS, @BASE, @USE instructions,
+			which would be executed afterwards, and actions
+			now performed at compile time would be delayed to run time.
+		2:	make cache expiration on time and on disk-change of class source
+		3:	in apache use subpools for compiled class storage
+		4:	in iis make up specialized Pool object for that
 */
 
 %{
-#define YYSTYPE  Array/*<op>*/ *
+#define YYSTYPE  Array/*<Operation>*/ *
 #define YYPARSE_PARAM  pc
 #define YYLEX_PARAM  pc
 #define YYDEBUG  1
@@ -19,9 +34,11 @@
 #include "pa_value.h"
 #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);
@@ -40,18 +57,58 @@ int yylex(YYSTYPE *lvalp, void *pc);
 %token EON
 %token STRING
 %token BOGUS
-%token LOGICAL_AND LOGICAL_OR
 
-%%
+%token BAD_STRING_COMPARISON_OPERATOR
 
+%token LAND "&&"
+%token LOR "||"
+%token LXOR "##"
+
+%token NLE "<="
+%token NGE ">="
+%token NEQ "=="
+%token NNE "!="
+
+%token SLT "lt"
+%token SGT "gt"
+%token SLE "le"
+%token SGE "ge"
+%token SEQ "eq"
+%token SNE "ne"
+
+%token DEF "def"
+%token IN "in"
+%token FEXISTS "-f"
+
+/* logical */
+%left "lt" "gt" "le" "ge"
+%left "eq" "ne"
+%left '<' '>' "<=" ">=" "##"
+%left "==" "!="
+%left "||"
+%left "&&"
+%left "def" "in" "-f"
+%left '!'
+
+/* bitwise */
+%left '#'
+%left '&' '|'
+%left '~'
+
+/* numerical */
+%left '-' '+'
+%left '*' '/' '%'
+%left NEG     /* negation: unary - */
+
+%%
 all:
 	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->cclass->add_method(*main_method_name, method);
 }
 |	methods;
 
@@ -62,31 +119,53 @@ 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->cclass!=&PC->request->root_class) { // already changed from default?
+			strcpy(PC->error, "class already have a name '");
+			strncat(PC->error, PC->cclass->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->cclass=NEW VClass(POOL);
+			PC->cclass->set_name(*name);
+			// defaulting base. may change with @BASE
+			PC->cclass->set_base(PC->request->root_class);
+			// append to request's classes
+			PC->request->classes_array()+=PC->cclass;
+			PC->request->classes().put(*name, PC->cclass);
+		} 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(file.cstr());
+			}
+		} else if(command==BASE_NAME) {
+			if(PC->cclass->base()!=&PC->request->root_class) { // already changed from default?
+				strcpy(PC->error, "class already have a base '");
+				strncat(PC->error, PC->cclass->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) {
@@ -94,15 +173,16 @@ control_method: '@' STRING '\n'
 					strcat(PC->error, ": undefined class in @"BASE_NAME);
 					YYERROR;
 				}
-				PC->vclass->set_base(*base);
+				PC->cclass->set_base(*base);
 			} else {
 				strcpy(PC->error, "@"BASE_NAME" must contain sole name");
 				YYERROR;
 			}
 		} else {
-			strcpy(PC->error, name.cstr());
-			strcat(PC->error, ": invalid special name. valid names are "
-				CLASS_NAME", "USES_NAME" and "BASE_NAME);
+			strcpy(PC->error, "'");
+			strncat(PC->error, command.cstr(), MAX_STRING/2);
+			strcat(PC->error, "' invalid special name. valid names are "
+				"'"CLASS_NAME"', '"USE_CONTROL_METHOD_NAME"' and '"BASE_NAME"'");
 			YYERROR;
 		}
 	}
@@ -116,17 +196,27 @@ 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);
-	PC->vclass->add_method(*name, method);
+	Method& method=*NEW Method(POOL, 
+		*name, 
+		0, 0/*min,max numbered_params_count*/, 
+		params_names, locals_names, 
+		$7, 0);
+	PC->cclass->add_method(*name, method);
 };
 
 maybe_bracketed_strings: empty | bracketed_maybe_strings;
@@ -140,20 +230,18 @@ maybe_comment: empty | STRING;
 
 maybe_codes: empty | codes;
 
-codes: code | codes code { 
-	$$=$1; 
-	P($$, $2);
-};
-code: write_str_literal | action;
+codes: code | codes code { $$=$1; P($$, $2) };
+code: write_string | action;
 action: get | put | with | call;
 
 /* get */
 
-get: '$' get_name {
-	$$=$2; /* stack: resulting value */
-	OP($$, 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 
@@ -162,21 +250,21 @@ name_without_curly_rdive:
 name_without_curly_rdive_read: name_without_curly_rdive_code {
 	$$=N(POOL); 
 	Array *diving_code=$1;
-	String *first_name=SLA2S(diving_code);
-	if(first_name && *first_name==SELF_NAME) {
-		OP($$, OP_WITH_SELF); /* stack: starting context */
+	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... */
 			diving_code->size()>2?3/*OP_+string+get_element*/:2/*OP_+string*/);
 	} else {
-		OP($$, OP_WITH_READ); /* stack: starting context */
+		O($$, OP_WITH_READ); /* stack: starting context */
 		P($$, diving_code);
 	}
 	/* diving code; stack: current context */
 };
 name_without_curly_rdive_root: ':' name_without_curly_rdive_code {
 	$$=N(POOL); 
-	OP($$, OP_WITH_ROOT); /* stack: starting context */
+	O($$, OP_WITH_ROOT); /* stack: starting context */
 	P($$, $2); /* diving code; stack: current context */
 };
 name_without_curly_rdive_class: class_prefix name_without_curly_rdive_code { $$=$1; P($$, $2) };
@@ -184,10 +272,9 @@ name_without_curly_rdive_code: name_adva
 
 /* put */
 
-put: '$' name_expr_wdive '[' constructor_value ']' {
+put: '$' name_expr_wdive construct {
 	$$=$2; /* stack: context,name */
-	P($$, $4); /* stack: context,name,constructor_value */
-	OP($$, OP_CONSTRUCT); /* value=pop; name=pop; context=pop; construct(context,name,value) */
+	P($$, $3); /* stack: context,name,constructor_value */
 };
 name_expr_wdive: 
 	name_expr_wdive_write
@@ -196,73 +283,104 @@ name_expr_wdive:
 name_expr_wdive_write: name_expr_dive_code {
 	$$=N(POOL);
 	Array *diving_code=$1;
-	String *first_name=SLA2S(diving_code);
-	if(first_name && *first_name==SELF_NAME) {
-		OP($$, OP_WITH_SELF); /* stack: starting context */
+	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... */
 			diving_code->size()>2?3/*OP_+string+get_element*/:2/*OP_+string*/);
 	} else {
-		OP($$, OP_WITH_WRITE); /* stack: starting context */
+		O($$, OP_WITH_WRITE); /* stack: starting context */
 		P($$, diving_code);
 	}
 	/* diving code; stack: current context */
 };
 name_expr_wdive_root: ':' name_expr_dive_code {
 	$$=N(POOL); 
-	OP($$, OP_WITH_ROOT); /* stack: starting context */
+	O($$, OP_WITH_ROOT); /* stack: starting context */
 	P($$, $2); /* diving code; stack: context,name */
 };
 name_expr_wdive_class: class_prefix name_expr_dive_code { $$=$1; P($$, $2) };
 
-constructor_value: 
-	empty_value /* optimized $var() case */
-|	STRING /* optimized $var(STRING) case */
-|	complex_constructor_param_value /* $var(something complex) */
+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) */
+}
 ;
-complex_constructor_param_value: complex_constructor_param_body {
+construct_by_expr: '(' expr_value ')' { 
+	$$=$2; /* stack: context, name, value */
+	O($$, OP_CONSTRUCT_EXPR); /* value=pop; name=pop; context=pop; construct(context,name,value) */
+}
+;
+any_constructor_code_value: 
+	empty_string_value /* optimized $var[] case */
+|	STRING /* optimized $var[STRING] case */
+|	constructor_code_value /* $var[something complex] */
+;
+constructor_code_value: constructor_code {
 	$$=N(POOL); 
-	OP($$, OP_CREATE_EWPOOL); /* stack: empty write context */
-	P($$, $1); /* some codes to that context */
-	OP($$, OP_REDUCE_EWPOOL); /* context=pop; stack: context.value() */
+	O($$, OP_CREATE_EWPOOL); /* stack: empty write context */
+	P($$, $1); /* some code that writes to that context */
+	O($$, OP_REDUCE_EWPOOL); /* context=pop; stack: context.value() */
 };
-complex_constructor_param_body: codes__excluding_sole_str_literal;
+constructor_code: codes__excluding_sole_str_literal;
 codes__excluding_sole_str_literal: action | code codes { $$=$1; P($$, $2) };
 
 /* 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} */
 	$$=$2; /* with_xxx,diving code; stack: context,method_junction */
-	OP($$, OP_GET_METHOD_FRAME); /* stack: context,method_frame */
+	O($$, OP_GET_METHOD_FRAME); /* stack: context,method_frame */
 	P($$, $3); /* filling method_frame.store_params */
-	OP($$, OP_CALL); /* method_frame=pop; ncontext=pop; call(ncontext,method_frame) */
+	O($$, 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($$, $2);
-	OP($$, 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 */
 	$$=$1;
-	OP($$, OP_STORE_PARAM);
+	O($$, OP_STORE_PARAM);
 }
-|	complex_constructor_param_value { /* (something complex) */
+|	constructor_code_value { /* [something complex] */
 	$$=$1;
-	OP($$, OP_STORE_PARAM);
+	O($$, OP_STORE_PARAM);
 }
 ;
+store_expr_param_part: write_expr_value {
+	$$=N(POOL); 
+	PCA($$, $1);
+};
+write_expr_value: expr_value {
+	$$=$1;
+	O($$, OP_WRITE);
+};
 
 /* name */
 
@@ -273,12 +391,12 @@ name_step: name_advance1 '.';
 name_advance1: name_expr_value {
 	/* stack: context */
 	$$=$1; /* stack: context,name */
-	OP($$, OP_GET_ELEMENT); /* name=pop; context=pop; stack: context.get_element(name) */
+	O($$, OP_GET_ELEMENT); /* name=pop; context=pop; stack: context.get_element(name) */
 };
 name_advance2: name_expr_value {
 	/* stack: context */
 	$$=$1; /* stack: context,name */
-	OP($$, OP_GET_ELEMENT); /* name=pop; context=pop; stack: context.get_element(name) */
+	O($$, OP_GET_ELEMENT); /* name=pop; context=pop; stack: context.get_element(name) */
 }
 |	STRING BOGUS
 ;
@@ -289,44 +407,36 @@ name_expr_value:
 ;
 name_expr_subvar_value: '$' subvar_ref_name_rdive {
 	$$=$2;
-	OP($$, OP_GET_ELEMENT);
+	O($$, OP_GET_ELEMENT);
 };
 name_expr_with_subvar_value: STRING subvar_get_writes {
 	$$=N(POOL); 
-	OP($$, OP_CREATE_EWPOOL);
+	O($$, OP_CREATE_EWPOOL);
 	P($$, $1);
-	OP($$, OP_WRITE);
+	O($$, OP_WRITE);
 	P($$, $2);
-	OP($$, OP_REDUCE_EWPOOL);
+	O($$, OP_REDUCE_EWPOOL);
 };
 subvar_ref_name_rdive: subvar_ref_name_rdive_read | subvar_ref_name_rdive_root;
 subvar_ref_name_rdive_read: STRING {
 	$$=N(POOL); 
-	OP($$, OP_WITH_READ);
+	O($$, OP_WITH_READ);
 	P($$, $1);
 };
 subvar_ref_name_rdive_root: ':' STRING {
 	$$=N(POOL); 
-	OP($$, OP_WITH_ROOT);
+	O($$, OP_WITH_ROOT);
 	P($$, $2);
 };
 subvar_get_writes: subvar__get_write | subvar_get_writes subvar__get_write { $$=$1; P($$, $2) };
 subvar__get_write: '$' subvar_ref_name_rdive {
 	$$=$2;
-	OP($$, OP_GET_ELEMENT__WRITE);
+	O($$, OP_GET_ELEMENT__WRITE);
 };
 
 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);
 };
 
 
@@ -334,24 +444,72 @@ class_prefix: STRING ':' {
 
 with: '$' name_without_curly_rdive '{' codes '}' {
 	$$=$2;
-	OP($$, OP_CREATE_RWPOOL);
+	O($$, OP_CREATE_RWPOOL);
 	P($$, $4);
-	OP($$, OP_REDUCE_RWPOOL);
-	OP($$, OP_WRITE);
+	O($$, OP_REDUCE_RWPOOL);
+	O($$, OP_WRITE);
+};
+
+/* expr */
+
+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: 
+	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($$, OP_STR_NE) }
+;
+
+string_inside_quotes_value: maybe_codes {
+	$$=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()) {
-		$$=$1;
-		OP($$, OP_WRITE);
-	} else {
-		// optimized case of special end of macro. see yylex
-		$$=N(POOL);
-	}
+write_string: STRING {
+	// optimized from OP_STRING+OP_WRITE to OP_STRING__WRITE
+	change_string_literal_to_write_string_literal($$=$1)
 };
-empty_value: /* empty */ { $$=SL(NEW VString(POOL)) };
+
+empty_string_value: /* empty */ { $$=VL(NEW VString(POOL)) };
 empty: /* empty */ { $$=N(POOL) };
 
 %%
@@ -385,9 +543,10 @@ int yylex(YYSTYPE *lvalp, void *pc) {
 		return result;
 	}
 	
-	char *begin=PC->source;
-	char *end;
+	const char *begin=PC->source;
+	const char *end;
 	int begin_line=PC->line;
+	int skip_analized=0;
 	while(true) {
 		c=*(end=(PC->source++));
 
@@ -397,6 +556,8 @@ int yylex(YYSTYPE *lvalp, void *pc) {
 		} else
 			PC->col++;
 
+		// todo: # in 0+1 column comment
+
 		// escaping: ^^ ^$ ^; ^) ^} ^( ^{ ^"
 		if(c=='^') 
 			switch(*PC->source) {
@@ -408,7 +569,7 @@ 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 _
@@ -509,14 +670,18 @@ 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);
@@ -524,34 +689,82 @@ int yylex(YYSTYPE *lvalp, void *pc) {
 			case '(':
 				lexical_brackets_nestage++;
 				RC;
-			case '+': case '-': case '*': case '/': case '%': 
-				RC;
-			case '&': case '|': 
-				if(*PC->source==c) { // &&  ||
-					result=c=='&'?LOGICAL_AND:LOGICAL_OR;
-					PC->source++;  PC->col++;
+			case '-':
+				if(*PC->source=='f') { // -f
+					skip_analized=1;
+					result=FEXISTS;
 				} else
-					result=c;				
+					result=c;
 				goto break2;
-			case '<': case '>': case '=': case '!':
+			case '+': case '*': case '/': case '%': 
+			case '~':
 			case ';':
 				RC;
+			case '&': case '|':  case '#':
+				if(*PC->source==c) { // && ||
+					result=c=='#'?LXOR:c=='&'?LAND:LOR;
+					skip_analized=1;
+				} else
+					result=c;
+				goto break2;
+			case '<': case '>': case '=': case '!': 
+				if(*PC->source=='=') { // <= >= == !=
+					skip_analized=1;
+					switch(c) {
+					case '<': result=NLE; break;
+					case '>': result=NGE; break;
+					case '=': result=NEQ; break;
+					case '!': result=NNE; break;
+					}
+				} else
+					result=c;
+				goto break2;
 			case '"':
 				push_LS(PC, LS_EXPRESSION_STRING);
 				RC;
 			case 'l': case 'g': case 'e': case 'n':
-				if(end==begin) {
-					case(*PC->source) {
+				if(end==begin) // right after whitespace
+					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;
+						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
-					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
-				begin=PC->source; // after whitespace
+				// 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;
 			}
@@ -559,13 +772,11 @@ 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) {
-				// name in expression ends also before binary operators 
+		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 '-': 
 					pop_LS(PC);
 					PC->source--;  if(--PC->col<0) { PC->line--;  PC->col=-1; }
 					result=EON;
@@ -576,7 +787,11 @@ 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
+			case '+': case '*': case '/': case '%': 
+			case '&': case '|': 
+			case '=': case '!':
 				pop_LS(PC);
 				PC->source--;  if(--PC->col<0) { PC->line--;  PC->col=-1; }
 				result=EON;
@@ -592,10 +807,10 @@ 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
@@ -670,6 +885,10 @@ 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'
@@ -720,16 +939,21 @@ 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;
@@ -742,24 +966,28 @@ int yylex(YYSTYPE *lvalp, void *pc) {
 	}
 
 break2:
-	if(begin==end)
-		return result;
-	else {
-		PC->pending_state=result;
-		// 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=SL(NEW VString(*PC->string));
+		*lvalp=VL(NEW VString(*PC->string));
 		// new pieces storage
 		PC->string=NEW String(POOL);
-		// go!
-		return STRING;
+		// make current result be pending for next call, return STRING for now
+		PC->pending_state=result;  result=STRING;
+	}
+	if(skip_analized) {
+		PC->source+=skip_analized;  PC->col+=skip_analized;
 	}
+	return result;
 }
 
 int real_yyerror(parse_control *pc, char *s)  /* Called by yyparse on error */