public override bool Parse(Token curToken, Lexer lexer)
{
if (index == null)
{
switch (curToken.Type)
{
case TokenTypes.Name:
index = new NameExpression(((NameToken)curToken).Content);
return(true);
case TokenTypes.StringLiteral:
index = new StringLiteralExpression(((StringLiteralToken)curToken).Content);
return(true);
default:
return(false);
}
}
else
{
if (!index.Completed)
{
return(index.Parse(curToken, lexer));
}
else
{
if (!isCompleted)
{
switch (curToken.Type)
{
case TokenTypes.IndexEnd:
isCompleted = true;
return(true);
case TokenTypes.MemberAccess:
index = new MemberAcessExpression(index);
return(true);
case TokenTypes.IndexStart:
index = new IndexAccessExpression(index);
return(true);
case TokenTypes.InvocationStart:
index = new InvocationExpression(index);
return(true);
default:
return(false);
}
}
else
{
return(false);
}
}
}
}
public EvalExpression Parse()
{
var curToken = lexer.GetNextToken();
EvalExpression res = null;
while (curToken.Type != TokenTypes.EOF)
{
if (res == null)
{
if (curToken.Type == TokenTypes.Name)
{
res = new NameExpression(((NameToken)curToken).Content);
res.IsRoot = true;
}
else
{
throw new NotSupportedException("Unexpected token:" + curToken.Type);
}
}
else
{
if (!res.Parse(curToken, lexer))
{
switch (curToken.Type)
{
case TokenTypes.MemberAccess:
res.IsRoot = false;
res = new MemberAcessExpression(res);
res.IsRoot = true;
break;
case TokenTypes.IndexStart:
res.IsRoot = false;
res = new IndexAccessExpression(res);
res.IsRoot = true;
break;
case TokenTypes.InvocationStart:
res.IsRoot = false;
res = new InvocationExpression(res);
res.IsRoot = true;
break;
default:
throw new NotSupportedException("Unexpected token:" + curToken.Type);
}
}
}
curToken = lexer.GetNextToken();
}
if (res != null && !res.Completed)
{
throw new NotSupportedException("Unexpected token: EOF");
}
return(res);
}
public MemberAcessExpression(EvalExpression body)
{
if (body is NameExpression || body is MemberAcessExpression || body is IndexAccessExpression || body is InvocationExpression)
{
this.body = body;
}
else
{
throw new NotSupportedException("Cannot retrive member for " + body);
}
}
public override bool Parse(Token curToken, Lexer lexer)
{
if (curParam == null)
{
switch (curToken.Type)
{
case TokenTypes.Name:
curParam = new NameExpression(((NameToken)curToken).Content);
return(true);
case TokenTypes.StringLiteral:
curParam = new StringLiteralExpression(((StringLiteralToken)curToken).Content);
return(true);
default:
return(false);
}
}
else
{
if (!curParam.Completed)
{
return(curParam.Parse(curToken, lexer));
}
else
{
if (!isCompleted)
{
switch (curToken.Type)
{
case TokenTypes.InvocationEnd:
if (curParam != null)
{
parameters.Add(curParam);
}
isCompleted = true;
return(true);
case TokenTypes.MemberAccess:
curParam = new MemberAcessExpression(curParam);
return(true);
case TokenTypes.IndexStart:
curParam = new IndexAccessExpression(curParam);
return(true);
case TokenTypes.InvocationStart:
curParam = new InvocationExpression(curParam);
return(true);
case TokenTypes.Comma:
if (curParam != null)
{
parameters.Add(curParam);
return(true);
}
else
{
return(false);
}
default:
return(false);
}
}
else
{
return(false);
}
}
}
}