--- parser3/src/classes/table.C	2001/05/08 06:42:54	1.73
+++ parser3/src/classes/table.C	2001/05/08 10:23:50	1.78
@@ -5,7 +5,7 @@
 
 	Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
 
-	$Id: table.C,v 1.73 2001/05/08 06:42:54 paf Exp $
+	$Id: table.C,v 1.78 2001/05/08 10:23:50 paf Exp $
 */
 
 #include "pa_config_includes.h"
@@ -193,9 +193,10 @@ static void _line(Request& r, const Stri
 static void _offset(Request& r, const String& method_name, MethodParams *params) {
 	Pool& pool=r.pool();
 	Table& table=static_cast<VTable *>(r.self)->table();
-	if(params->size())
-		table.shift((int)r.process(params->get(0)).as_double());
-	else {
+	if(params->size()) {
+		Value& offset_expr=params->get_junction(0, "offset must be expression");
+		table.shift((int)r.process(offset_expr).as_double());
+	} else {
 		Value& value=*new(pool) VInt(pool, table.current());
 		r.write_no_lang(value);
 	}
@@ -226,11 +227,10 @@ static void _menu(Request& r, const Stri
 }
 
 static void _empty(Request& r, const String& method_name, MethodParams *params) {
+	Pool& pool=r.pool();
 	Table& table=static_cast<VTable *>(r.self)->table();
-	if(table.size()==0)
-		r.write_pass_lang(r.process(params->get(0)));
-	else if(params->size()>1)
-		r.write_pass_lang(r.process(params->get(1)));
+	
+	r.write_no_lang(*new(pool) VBool(pool, table.size()==0));
 }
 
 /// used by table: _record / store_column_item_to_hash
@@ -249,7 +249,7 @@ static void store_column_item_to_hash(Ar
 		value=new(*ri.pool) VUnknown(*ri.pool);
 	ri.hash->put(column_name, value);
 }
-static void _record(Request& r, const String& method_name, MethodParams *params) {
+static void _record(Request& r, const String& method_name, MethodParams *) {
 	Table& table=static_cast<VTable *>(r.self)->table();
 	if(const Array *columns=table.columns()) {
 		Pool& pool=r.pool();
@@ -261,7 +261,69 @@ static void _record(Request& r, const St
 	}
 }
 
-struct Seq_item {
+/// used by table: _hash / table_row_to_hash
+struct Row_info {
+	Table *table;
+	int key_field;
+	Array *value_fields;
+	Hash *hash;
+};
+static void table_row_to_hash(Array::Item *value, void *info) {
+	Array& row=*static_cast<Array *>(value);
+	Row_info& ri=*static_cast<Row_info *>(info);
+	Pool& pool=ri.table->pool();
+
+	if(ri.key_field<row.size()) {
+		VHash& result=*new(pool) VHash(pool);
+		Hash& hash=*result.get_hash();
+		for(int i=0; i<ri.value_fields->size(); i++) {
+			int value_field=ri.value_fields->get_int(i);
+			if(value_field<row.size())
+				hash.put(
+					*ri.table->columns()->get_string(value_field),
+					new(pool) VString(*row.get_string(value_field)));
+		}
+		
+		ri.hash->put(*row.get_string(ri.key_field), &result);
+	}
+}
+static void _hash(Request& r, const String& method_name, MethodParams *params) {
+	Table& table=static_cast<VTable *>(r.self)->table();
+	if(const Array *columns=table.columns()) 
+		if(columns->size()>1) {
+			Pool& pool=r.pool();
+
+			const String& key_field_name=params->get_no_junction(0, 
+				"key field name must not be code").as_string();
+			int key_field=table.column_name2index(key_field_name, true);
+			int value_fields_count=params->size()-1;
+			bool value_fields_by_params=value_fields_count!=0;
+			if(!value_fields_by_params)
+				value_fields_count=columns->size()-1; // all columns except key
+			Array value_fields(pool, value_fields_count);
+			if(value_fields_by_params) {
+				for(int i=1; i<params->size(); i++) {
+					const String& value_field_name=params->get_no_junction(i,
+						"value field name must not be code").as_string();
+					value_fields+=table.column_name2index(value_field_name, true);
+				}
+			} else { // by all columns except key
+				for(int i=0; i<columns->size(); i++)
+					if(i!=key_field)
+						value_fields+=i;
+			}
+
+			// integers: key_field & value_fields
+			Value& result=*new(pool) VHash(pool);
+			Row_info row_info={&table, key_field, &value_fields, result.get_hash()};
+			table.for_each(table_row_to_hash, &row_info);
+			result.set_name(method_name);
+			r.write_no_lang(result);
+		}
+}
+
+/// used by table: _sort / sort_cmp_string|sort_cmp_double
+struct Table_seq_item {
 	Array *row;
 	union {
 		char *c_str;
@@ -270,13 +332,13 @@ struct Seq_item {
 };
 static int sort_cmp_string(const void *a, const void *b) {
 	return strcmp(
-		static_cast<const Seq_item *>(a)->value.c_str, 
-		static_cast<const Seq_item *>(b)->value.c_str
+		static_cast<const Table_seq_item *>(a)->value.c_str, 
+		static_cast<const Table_seq_item *>(b)->value.c_str
 	);
 }
 static int sort_cmp_double(const void *a, const void *b) {
-	double va=static_cast<const Seq_item *>(a)->value.d;
-	double vb=static_cast<const Seq_item *>(b)->value.d;
+	double va=static_cast<const Table_seq_item *>(a)->value.d;
+	double vb=static_cast<const Table_seq_item *>(b)->value.d;
 	if(va<vb)
 		return -1;
 	else if(va>vb)
@@ -297,7 +359,7 @@ static void _sort(Request& r, const Stri
 	if(!table.size())
 		return;
 
-	Seq_item *seq=(Seq_item *)malloc(sizeof(Seq_item)*table.size());
+	Table_seq_item *seq=(Table_seq_item *)malloc(sizeof(Table_seq_item)*table.size());
 	int i;
 
 	// calculate key values
@@ -316,7 +378,7 @@ static void _sort(Request& r, const Stri
 			seq[i].value.d=value.as_double();
 	}
 	// sort keys
-	_qsort(seq, table.size(), sizeof(Seq_item), 
+	_qsort(seq, table.size(), sizeof(Table_seq_item), 
 		key_values_are_strings?sort_cmp_string:sort_cmp_double);
 
 	// reorder table as they require in 'seq'
@@ -589,13 +651,18 @@ MTable::MTable(Pool& apool) : Methoded(a
 	// ^table.menu{code}[delim]
 	add_native_method("menu", Method::CT_DYNAMIC, _menu, 1, 2);
 
-	// ^table.empty{code-when-empty}  
-	// ^table.empty{code-when-empty}{code-when-not}
-	add_native_method("empty", Method::CT_DYNAMIC, _empty, 1, 2);
+	// ^table.empty[]
+	add_native_method("empty", Method::CT_DYNAMIC, _empty, 0, 0);
 
 	// ^table.record[]
 	add_native_method("record", Method::CT_DYNAMIC, _record, 0, 0);
 
+	/** @fn _hash
+		^table:hash[key field name]
+		^table:hash[key field name][value field name;...]
+	*/
+	add_native_method("hash", Method::CT_DYNAMIC, _hash, 1, 1000);
+
 	// ^table.sort{string-key-maker} ^table.sort{string-key-maker}[asc|desc]
 	// ^table.sort(numeric-key-maker) ^table.sort(numeric-key-maker)[asc|desc]
 	add_native_method("sort", Method::CT_DYNAMIC, _sort, 1, 2);