public Node AssignmentOrCallStatement()
{
var id_node = Node.fromToken(Expect(TokenCategory.IDENTIFIER));
Node node = null;
if (Has(TokenCategory.PARENTHESIS_OPEN))
{
node = new CallStatementNode()
{
AnchorToken = id_node.AnchorToken
};
Expect(TokenCategory.PARENTHESIS_OPEN);
node.Add(Optional(firstOfExpression, () =>
{
var list = new List <Node>()
{
Expression()
};
list.AddRange(ZeroOrMore(TokenCategory.COMMA, Expression, true));
return(list);
}));
Expect(TokenCategory.PARENTHESIS_CLOSE);
}
else if (Has(TokenCategory.BRACKET_OPEN) || Has(TokenCategory.COLON_EQUAL))
{
node = new AssignmentNode();
if (Has(TokenCategory.BRACKET_OPEN))
{
Expect(TokenCategory.BRACKET_OPEN);
var expression_node = Expression();
Expect(TokenCategory.BRACKET_CLOSE);
node.Add(new ListIndexNode()
{
id_node, expression_node
});
}
else
{
node.Add(id_node);
}
node.AnchorToken = Expect(TokenCategory.COLON_EQUAL);
node.Add(Expression());
}
else
{
throw new SyntaxError(firstOfAssignmentOrCallStatement, tokenStream.Current);
}
Expect(TokenCategory.SEMICOLON);
return(node);
}
public Node Stmt()
{
switch (CurrentToken)
{
case TokenCategory.IDENTIFIER:
var idToken = Expect(TokenCategory.IDENTIFIER);
switch (CurrentToken)
{
case TokenCategory.ASSIGN:
Expect(TokenCategory.ASSIGN);
var ass = new AssignmentNode()
{
AnchorToken = idToken
};
ass.Add(Expr());
Expect(TokenCategory.SEMICOLON);
return(ass);
case TokenCategory.INCREMENT:
Expect(TokenCategory.INCREMENT);
var inc = new IncrementNode()
{
AnchorToken = idToken
};
Expect(TokenCategory.SEMICOLON);
return(inc);
case TokenCategory.DECREMENT:
Expect(TokenCategory.DECREMENT);
var dec = new DecrementNode()
{
AnchorToken = idToken
};
Expect(TokenCategory.SEMICOLON);
return(dec);
case TokenCategory.PARENTHESIS_OPEN:
Expect(TokenCategory.PARENTHESIS_OPEN);
var fun = new FunCallNode()
{
AnchorToken = idToken
};
fun.Add(ExprList());
Expect(TokenCategory.PARENTHESIS_CLOSE);
Expect(TokenCategory.SEMICOLON);
return(fun);
}
break;
case TokenCategory.IF:
return(If());
case TokenCategory.WHILE:
return(While());
case TokenCategory.BREAK:
var bre = new StmtNode()
{
AnchorToken = Expect(TokenCategory.BREAK)
};
Expect(TokenCategory.SEMICOLON);
return(bre);
case TokenCategory.RETURN:
return(Return());
case TokenCategory.SEMICOLON:
return(new StmtNode()
{
AnchorToken = Expect(TokenCategory.SEMICOLON)
});
default:
throw new SyntaxError(firstOfStmt, tokenStream.Current);
}
throw new SyntaxError(firstOfStmt, tokenStream.Current);
}