/// <summary>
/// Parser for EachStatement
/// </summary>
/// <returns>Parsed EachStatement</returns>
public EachStatement ParseEachStatement()
{
EachStatement eachStatement = new EachStatement();
//Skip each token
NextToken("each", "each (identifier : expression) Statement", "each");
//Skip ( token
NextToken("(", "each (identifier : expression) Statement", '(');
//Parse identifier
CurrentToken = TokenStream.NextToken();
eachStatement.SetIdentifier(CurrentToken.GetValue().ToString());
//Skip : token
NextToken(":", "each (identifier : expression) Statement", ':');
//Parse expression
eachStatement.SetExpression(expressionParser.ParseExpression());
//Skip ) token
NextToken(")", "each (identifier : expression) Statement", ')');
//Parse statement
eachStatement.SetStatement(ParseStatement());
return(eachStatement);
}
/// <summary>
/// Interpret EachStatement
/// </summary>
/// <param name="statement">EachStatement to interpret</param>
public override void Visit(EachStatement statement)
{
//If no root element, create one
if (Root == null)
{
XHTMLElement newRoot = new XHTMLElement("html", null, true);
Root = newRoot;
Current = Root;
}
Expression expr = statement.GetExpression();
//Different looping with different expression types
if (expr is ListExpression)
{ //Iterate through list
ListExpression listExpression = (ListExpression)expr;
//Iterate through list with expression
XHTMLElement temp = Current;
foreach (Expression currentExpr in listExpression.GetExpressions())
{
Current = temp;
//New scope
SymbolTable = new SymbolTable(SymbolTable);
//Define variable and interpret statement with this scope
SymbolTable.AddVariableDefinition(statement.GetIdentifier(), currentExpr);
statement.GetStatement().AcceptVisitor(this);
//Return to parent scope
SymbolTable = SymbolTable.GetParentSymbolTable();
}
}
else if (expr is FieldExpression)
{ //Get expression in referenced record
Expression expression = GetExpression((FieldExpression)expr);
//Visit each for expression
EachStatement eachStatement = new EachStatement();
eachStatement.SetExpression(expression);
eachStatement.SetStatement(statement.GetStatement());
eachStatement.SetIdentifier(statement.GetIdentifier());
Visit(eachStatement);
}
else if (expr is VarExpression)
{ //Get expression of variable
Expression expression = SymbolTable.GetVariableDefinition(((VarExpression)expr).GetVariableIdentifier());
//Visit each for expression
EachStatement eachStatement = new EachStatement();
eachStatement.SetExpression(expression);
eachStatement.SetStatement(statement.GetStatement());
eachStatement.SetIdentifier(statement.GetIdentifier());
Visit(eachStatement);
}
}