public FunctionNode(Node name,Node paraNode,Node func)
: base()
{
this.name = (SymbolNode)name;
this.paraNode = (ParametersNode)paraNode;
this.func = (BlockNode)func;
this.paraNode.SetBlock(this.func);
}
//関数呼び出し。
private Node CallFunction(SymbolNode symbol)
{
Node f = symbol.eval();
if(!(f is FunctionNode)){
throw new UnexpectedException(tokenType,"not paren");
}
FunctionNode func = (FunctionNode)f;
ArgumentsNode args = (ArgumentsNode)ParseArguments();
return func.call(args);
}
private SymbolNode ParseSymbol()
{
SymbolNode node = new SymbolNode((string)lex.Value);
node.Block = Block;
GetToken();
return node;
}
//数値とか、文字列とか、一番最初にパースされるもの
//もしくはカッコの中。
private Node ParseFirst()
{
ShowDebugMessage("ParseFirst");
Node node = null;
switch(tokenType){
case TokenType.Number:
node = new NumberNode((decimal)lex.Value);
GetToken();
break;
case TokenType.String:
node = new StringNode((string)lex.Value);
GetToken();
break;
case TokenType.Symbol:
node = new SymbolNode((string)lex.Value);
node.Block = Block;
GetToken();
if(tokenType == TokenType.OpenParen){
node = CallFunction((SymbolNode)node);
}
break;
case TokenType.Define:
GetToken ();
node = DefineFunction();
break;
case TokenType.If:
GetToken();
node = ParseIf();
break;
case TokenType.While:
GetToken();
node = ParseWhile();
break;
case TokenType.OpenBrace:
GetToken();
node = ParseBlock();
break;
case TokenType.OpenParen:
GetToken();
node = ParseParentheses();
break;
default:
break;
}
if(tokenType==TokenType.Dot){
GetToken();
node = ParseMethod(node);
}
return node;
}