4198578702 2010-11-07        kinaba: /**
4198578702 2010-11-07        kinaba:  * Authors: k.inaba
4198578702 2010-11-07        kinaba:  * License: NYSL 0.9982 http://www.kmonos.net/nysl/
4198578702 2010-11-07        kinaba:  *
4198578702 2010-11-07        kinaba:  * Runtime data structures for Polemy programming language.
423f308350 2010-11-07        kinaba:  */
4198578702 2010-11-07        kinaba: module polemy.runtime;
4198578702 2010-11-07        kinaba: import polemy._common;
423f308350 2010-11-07        kinaba: 
423f308350 2010-11-07        kinaba: class PolemyRuntimeException : Exception
423f308350 2010-11-07        kinaba: {
423f308350 2010-11-07        kinaba: 	this(string msg) { super(msg); }
423f308350 2010-11-07        kinaba: }
423f308350 2010-11-07        kinaba: 
423f308350 2010-11-07        kinaba: abstract class Value
423f308350 2010-11-07        kinaba: {
423f308350 2010-11-07        kinaba: }
423f308350 2010-11-07        kinaba: 
423f308350 2010-11-07        kinaba: class IntValue : Value
423f308350 2010-11-07        kinaba: {
423f308350 2010-11-07        kinaba: 	BigInt data;
423f308350 2010-11-07        kinaba: 	mixin SimpleConstructor;
423f308350 2010-11-07        kinaba: 	mixin SimpleCompare;
423f308350 2010-11-07        kinaba: }
423f308350 2010-11-07        kinaba: 
423f308350 2010-11-07        kinaba: class StrValue : Value
423f308350 2010-11-07        kinaba: {
423f308350 2010-11-07        kinaba: 	string data;
423f308350 2010-11-07        kinaba: 	mixin SimpleConstructor;
423f308350 2010-11-07        kinaba: 	mixin SimpleCompare;
423f308350 2010-11-07        kinaba: }
423f308350 2010-11-07        kinaba: 
423f308350 2010-11-07        kinaba: class Context
423f308350 2010-11-07        kinaba: {
423f308350 2010-11-07        kinaba: 	Context       parent;
423f308350 2010-11-07        kinaba: 	Value[string] table;
423f308350 2010-11-07        kinaba: 	this(Context parent = null) { this.parent = parent; }
423f308350 2010-11-07        kinaba: 
423f308350 2010-11-07        kinaba: 	void add(string i, Value v)
423f308350 2010-11-07        kinaba: 	{
423f308350 2010-11-07        kinaba: 		table[i] = v;
423f308350 2010-11-07        kinaba: 	}
423f308350 2010-11-07        kinaba: 
423f308350 2010-11-07        kinaba: 	Value opIndex(string i)
423f308350 2010-11-07        kinaba: 	{
423f308350 2010-11-07        kinaba: 		if( i in table )
423f308350 2010-11-07        kinaba: 			return table[i];
423f308350 2010-11-07        kinaba: 		if( parent is null )
423f308350 2010-11-07        kinaba: 			throw new PolemyRuntimeException(sprintf!"variable %s not found"(i));
423f308350 2010-11-07        kinaba: 		return parent[i];
423f308350 2010-11-07        kinaba: 	}
423f308350 2010-11-07        kinaba: 
423f308350 2010-11-07        kinaba: 	void opIndexAssign(Value v, string i)
423f308350 2010-11-07        kinaba: 	{
423f308350 2010-11-07        kinaba: 		if( i in table )
423f308350 2010-11-07        kinaba: 			return table[i] = v;
423f308350 2010-11-07        kinaba: 		if( parent is null )
423f308350 2010-11-07        kinaba: 			throw new PolemyRuntimeException(sprintf!"variable %s not found"(i));
423f308350 2010-11-07        kinaba: 		return parent[i] = v;
423f308350 2010-11-07        kinaba: 	}
423f308350 2010-11-07        kinaba: }