--- parser3/src/classes/table.C	2002/03/27 15:30:34	1.146
+++ parser3/src/classes/table.C	2002/04/18 10:51:00	1.151
@@ -4,7 +4,7 @@
 	Copyright (c) 2001, 2002 ArtLebedev Group (http://www.artlebedev.com)
 	Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
 
-	$Id: table.C,v 1.146 2002/03/27 15:30:34 paf Exp $
+	$Id: table.C,v 1.151 2002/04/18 10:51:00 paf Exp $
 */
 
 #include "classes.h"
@@ -15,10 +15,6 @@
 #include "pa_sql_connection.h"
 #include "pa_vbool.h"
 
-// defines
-
-#define TABLE_CLASS_NAME "table"
-
 // class
 
 class MTable : public Methoded {
@@ -46,7 +42,7 @@ static void _create(Request& r, const St
 	// data is last parameter
 	Temp_lang temp_lang(r, String::UL_PASS_APPENDED);
 	const String& data=
-		r.process(params->as_junction(params->size()-1, "body must be code")).as_string();
+		r.process_to_string(params->as_junction(params->size()-1, "body must be code"));
 
 	size_t pos_after=0;
 	// parse columns
@@ -203,16 +199,14 @@ static void _save(Request& r, const Stri
 
 static void _count(Request& r, const String& method_name, MethodParams *) {
 	Pool& pool=r.pool();
-	Value& value=*new(pool) VInt(pool, static_cast<VTable *>(r.self)->table().size());
-	value.set_name(method_name);
-	r.write_no_lang(value);
+	int result=static_cast<VTable *>(r.self)->table().size();
+	r.write_no_lang(*new(pool) VInt(pool, result));
 }
 
 static void _line(Request& r, const String& method_name, MethodParams *) {
 	Pool& pool=r.pool();
-	Value& value=*new(pool) VInt(pool, 1+static_cast<VTable *>(r.self)->table().current());
-	value.set_name(method_name);
-	r.write_no_lang(value);
+	int result=1+static_cast<VTable *>(r.self)->table().current();
+	r.write_no_lang(*new(pool) VInt(pool, result));
 }
 
 static void _offset(Request& r, const String& method_name, MethodParams *params) {
@@ -233,12 +227,9 @@ static void _offset(Request& r, const St
 		}		    
 		
 		Value& offset_expr=params->as_junction(params->size()-1, "offset must be expression");
-		table.offset(absolute, r.process(offset_expr).as_int());
-	} else {
-		Value& value=*new(pool) VInt(pool, table.current());
-		value.set_name(method_name);
-		r.write_no_lang(value);
-	}
+		table.offset(absolute, r.process_to_value(offset_expr).as_int());
+	} else
+		r.write_no_lang(*new(pool) VInt(pool, table.current()));
 }
 
 static void _menu(Request& r, const String& method_name, MethodParams *params) {
@@ -246,15 +237,14 @@ static void _menu(Request& r, const Stri
 	
 	Value *delim_maybe_code=params->size()>1?&params->get(1):0;
 
-	VTable& vtable=*static_cast<VTable *>(r.self);
-	Table& table=vtable.table();
+	Table& table=static_cast<VTable *>(r.self)->table();
 	bool need_delim=false;
 	int saved_current=table.current();
 	int size=table.size();
 	for(int row=0; row<size; row++) {
 		table.set_current(row);
 
-		Value& processed_body=r.process(body_code);
+		StringOrValue processed_body=r.process(body_code);
 		if(delim_maybe_code) { // delimiter set?
 			const String *string=processed_body.get_string();
 			if(need_delim && string && string->size()) // need delim & iteration produced string?
@@ -328,7 +318,6 @@ static void _hash(Request& r, const Stri
 			Row_info row_info={&self_table, key_field, &value_fields, result.get_hash(0)};
 			self_table.for_each(table_row_to_hash, &row_info);
 		}
-	result.set_name(method_name);
 	r.write_no_lang(result);
 }
 
@@ -379,7 +368,7 @@ static void _sort(Request& r, const Stri
 		old_table.set_current(i);
 		// calculate key value
 		seq[i].row=(MethodParams *)old_table.get(i);
-		Value& value=*r.process(key_maker).as_expr_result(true/*return string as-is*/);
+		Value& 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();
 
@@ -410,14 +399,13 @@ static bool _locate_expression(Request&
 
 	Value& expression_code=params->as_junction(0, "must be expression");
 
-	VTable& vtable=*static_cast<VTable *>(r.self);
-	Table& table=vtable.table();
+	Table& table=static_cast<VTable *>(r.self)->table();
 	int saved_current=table.current();
 	int size=table.size();
 	for(int row=0; row<size; row++) {
 		table.set_current(row);
 
-		if(r.process(expression_code).as_bool())
+		if(r.process_to_value(expression_code).as_bool())
 			return true;
 	}
 	table.set_current(saved_current);
@@ -429,8 +417,7 @@ static bool _locate_name_value(Request&
 			&method_name,
 			"locate by name and value has only two parameters - name and value");
 
-	VTable& vtable=*static_cast<VTable *>(r.self);
-	Table& table=vtable.table();
+	Table& table=static_cast<VTable *>(r.self)->table();
 	return table.locate(
 		params->as_string(0, "column name must be string"),
 		params->as_string(1, "value must be string")
@@ -438,19 +425,15 @@ static bool _locate_name_value(Request&
 }
 static void _locate(Request& r, const String& method_name, MethodParams *params) {
 	Pool& pool=r.pool();
-	Value& result=*new(pool) VBool(pool, 
-		params->get(0).get_junction()?
+	bool result=params->get(0).get_junction()?
 		_locate_expression(r, method_name, params) :
-		_locate_name_value(r, method_name, params));
-	result.set_name(method_name);
-	r.write_no_lang(result);
+		_locate_name_value(r, method_name, params);
+	r.write_no_lang(*new(pool) VBool(pool, result));
 }
 
 static void _flip(Request& r, const String& method_name, MethodParams *params) {
 	Pool& pool=r.pool();
-	VTable& vtable=*static_cast<VTable *>(r.self);
-
-	Table& old_table=*vtable.get_table();
+	Table& old_table=static_cast<VTable *>(r.self)->table();
 	Table& new_table=*new(pool) Table(pool, &method_name, 0/*nameless*/);
 	if(old_table.size())
 		if(int old_cols=old_table.at(0).size()) 
@@ -471,14 +454,13 @@ static void _append(Request& r, const St
 	// data
 	Temp_lang temp_lang(r, String::UL_PASS_APPENDED);
 	const String& string=
-		r.process(params->as_junction(0, "body must be code")).as_string();
+		r.process_to_string(params->as_junction(0, "body must be code"));
 
 	// parse cells
 	Array& row=*new(pool) Array(pool);
 	string.split(row, 0, "\t", 1, String::UL_AS_IS);
 
-	VTable& vtable=*static_cast<VTable *>(r.self);
-	vtable.table()+=&row;
+	static_cast<VTable *>(r.self)->table()+=&row;
 }
 
 static void _join(Request& r, const String& method_name, MethodParams *params) {
@@ -574,9 +556,9 @@ static void _sql(Request& r, const Strin
 		if(voptions.is_defined())
 			if(Hash *options=voptions.get_hash(&method_name)) {
 				if(Value *vlimit=(Value *)options->get(*sql_limit_name))
-					limit=(ulong)r.process(*vlimit).as_double();
+					limit=(ulong)r.process_to_value(*vlimit).as_double();
 				if(Value *voffset=(Value *)options->get(*sql_offset_name))
-					offset=(ulong)r.process(*voffset).as_double();
+					offset=(ulong)r.process_to_value(*voffset).as_double();
 			} else
 				throw Exception("parser.runtime",
 					&method_name,
@@ -584,7 +566,7 @@ static void _sql(Request& r, const Strin
 	}
 
 	Temp_lang temp_lang(r, String::UL_SQL);
-	const String& statement_string=r.process(statement).as_string();
+	const String& statement_string=r.process_to_string(statement);
 	const char *statement_cstr=
 		statement_string.cstr(String::UL_UNSPECIFIED, r.connection(&method_name));
 	Table_sql_event_handlers handlers(pool, method_name,
@@ -641,16 +623,40 @@ static void _columns(Request& r, const S
 		}
 	}
 
-	VTable& result=*new(pool) VTable(pool, &result_table);
-	result.set_name(method_name);
-	r.write_no_lang(result);
+	r.write_no_lang(*new(pool) VTable(pool, &result_table));
 }
 
-// constructor
+static void _select(Request& r, const String& method_name, MethodParams *params) {
+	Pool& pool=r.pool();
 
-MTable::MTable(Pool& apool) : Methoded(apool) {
-	set_name(*NEW String(pool(), TABLE_CLASS_NAME));
+	Value& vcondition=params->as_junction(0, "condition must be expression");
 
+	Table& source_table=static_cast<VTable *>(r.self)->table();
+	Table& result_table=*new(pool) Table(pool, 
+		source_table.origin_string(), 
+		source_table.columns()
+	);
+
+	int saved_current=source_table.current();
+	int size=source_table.size();
+	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.at(row); // =green light to go to result
+	}
+	source_table.set_current(saved_current);
+
+	r.write_no_lang(*new(pool) VTable(pool, &result_table));
+}
+
+// constructor
+
+MTable::MTable(Pool& apool) : Methoded(apool, "table") {
 	// ^table::create{data}
 	// ^table::create[nameless]{data}
 	// ^table::create[table]
@@ -708,6 +714,9 @@ MTable::MTable(Pool& apool) : Methoded(a
 
 	// ^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);
 }
 
 // global variable