/// <summary>
/// Parse the expression.
/// </summary>
/// <returns></returns>
public override Expr Parse()
{
var printToken = _tokenIt.NextToken;
var lineToken = _tokenIt.AdvanceAndGet<Token>();
Expr lineExp = null;
if (lineToken.Kind == TokenKind.Multi)
lineExp = _parser.ParseInterpolatedExpression(lineToken);
else
lineExp = new ConstantExpr(new LString((string)lineToken.Value));
var nameExp = _parser.ToIdentExpr(printToken.Token.Text, printToken);
var exp = (FunctionCallExpr)_parser.ToFunctionCallExpr(nameExp, null, printToken);
exp.ParamListExpressions.Add(lineExp);
// Move past this plugin.
_tokenIt.Advance();
return exp;
}
/// <summary>
/// Visits the condition expression tree
/// </summary>
/// <param name="exp"></param>
public object VisitConstant(ConstantExpr exp)
{
return null;
}
/// <summary>
/// Evaluate a constant.
/// </summary>
/// <param name="val"></param>
/// <returns></returns>
public object VisitConstant(ConstantExpr expr)
{
var val = expr.Value;
// 1. Null
if (val == LObjects.Null)
return val;
if (val is LObject)
return val;
// 2. Actual value.
var ltype = LangTypeHelper.ConvertToLangValue(val);
return ltype;
}
/// <summary>
/// Creates a variable expression with symbol scope, context, script refernce set.
/// </summary>
/// <param name="name"></param>
/// <returns></returns>
public static Expr Const(LObject obj, TokenData token)
{
var exp = new ConstantExpr();
exp.Value = obj;
SetupContext(exp, token);
return exp;
}
/// <summary>
/// Creates a variable expression with symbol scope, context, script refernce set.
/// </summary>
/// <param name="name"></param>
/// <returns></returns>
public Expr ToConstExpr(LObject obj, TokenData token)
{
var exp = new ConstantExpr(obj);
this.SetupContext(exp, token);
return exp;
}
