/// <summary>
/// Scans for a function entry.
/// </summary>
/// <param name="engine">The current parse engine.</param>
/// <returns>The created expression.</returns>
public override Expression Scan(ParseEngine engine)
{
var start = engine.Pointer;
var kw = new FunctionKeyword(engine.CurrentLine, engine.CurrentColumn, engine.Query);
engine.Advance(Token.Length).Skip();
if (engine.Pointer == engine.Characters.Length)
{
kw.Length = engine.Pointer - start;
engine.AddError(new YAMPFunctionNameMissing(engine), kw);
return kw;
}
kw.name = engine.Elements.FindExpression<SymbolExpression>().Scan(engine) as SymbolExpression;
if (kw.name == null)
{
engine.AddError(new YAMPFunctionNameMissing(engine), kw);
return kw;
}
engine.Skip();
if (engine.Pointer == engine.Characters.Length)
{
kw.Length = engine.Pointer - start;
engine.AddError(new YAMPFunctionArgumentsMissing(engine), kw);
return kw;
}
kw.arguments = engine.Elements.FindExpression<BracketExpression>().Scan(engine) as BracketExpression;
if (engine.Pointer == engine.Characters.Length)
{
kw.Length = engine.Pointer - start;
engine.AddError(new YAMPFunctionBodyMissing(engine), kw.arguments);
return kw;
}
kw.Body = engine.ParseStatement();
kw.Length = engine.Pointer - start;
if (kw.Body.Container.Expressions.Length == 1 && kw.Body.Container.Expressions[0] is GroupExpression)
{
var container = (GroupExpression)kw.Body.Container.Expressions[0];
var context = new ParseContext(engine.Context.Parent);
var input = container.Scope.Input;
container.Scope = new QueryContext(context, input);
}
else
{
engine.AddError(new YAMPFunctionBodyMissing(engine), kw.arguments);
return kw;
}
if (kw.arguments == null)
{
engine.AddError(new YAMPFunctionArgumentsMissing(engine), kw);
return kw;
}
else if (kw.arguments.HasContent && !kw.arguments.IsSymbolList)
{
engine.AddError(new YAMPFunctionArgumentsSymbols(engine), kw.arguments);
return kw;
}
return kw;
}
/// <summary>
/// Scans for a function entry.
/// </summary>
/// <param name="engine">The current parse engine.</param>
/// <returns>The created expression.</returns>
public override Expression Scan(ParseEngine engine)
{
var start = engine.Pointer;
var kw = new FunctionKeyword(engine.CurrentLine, engine.CurrentColumn, engine.Query);
engine.Advance(Token.Length).Skip();
if (engine.Pointer == engine.Characters.Length)
{
kw.Length = engine.Pointer - start;
engine.AddError(new YAMPFunctionNameMissing(engine), kw);
return(kw);
}
kw.name = engine.Elements.FindExpression <SymbolExpression>().Scan(engine) as SymbolExpression;
if (kw.name == null)
{
engine.AddError(new YAMPFunctionNameMissing(engine), kw);
return(kw);
}
engine.Skip();
if (engine.Pointer == engine.Characters.Length)
{
kw.Length = engine.Pointer - start;
engine.AddError(new YAMPFunctionArgumentsMissing(engine), kw);
return(kw);
}
kw.arguments = engine.Elements.FindExpression <BracketExpression>().Scan(engine) as BracketExpression;
if (engine.Pointer == engine.Characters.Length)
{
kw.Length = engine.Pointer - start;
engine.AddError(new YAMPFunctionBodyMissing(engine), kw.arguments);
return(kw);
}
kw.Body = engine.ParseStatement();
kw.Length = engine.Pointer - start;
if (kw.Body.Container.Expressions.Length == 1 && kw.Body.Container.Expressions[0] is GroupExpression)
{
var container = (GroupExpression)kw.Body.Container.Expressions[0];
var context = new ParseContext(engine.Context.Parent);
var input = container.Scope.Input;
container.Scope = new QueryContext(context, input);
}
else
{
engine.AddError(new YAMPFunctionBodyMissing(engine), kw.arguments);
return(kw);
}
if (kw.arguments == null)
{
engine.AddError(new YAMPFunctionArgumentsMissing(engine), kw);
return(kw);
}
else if (kw.arguments.HasContent && !kw.arguments.IsSymbolList)
{
engine.AddError(new YAMPFunctionArgumentsSymbols(engine), kw.arguments);
return(kw);
}
return(kw);
}