public ForeachActionNode(VarDeclaringNode decl, IdentifierNode ident, ExpressionNode expr,
ActionSequenceNode actions, SourceCodePosition pos) : base(pos)
{
itsDeclaring = decl;
Identifier = ident;
Expression = expr;
Actions = actions;
}
// uses the current scope level to determine whether the variable should be added to the current class ST or the current method ST
public object Visit(VarDeclaringNode n, object o)
{
if (_currentScopeLevel == 1)
{
_currentClassST.EnterSymbol(n.Identifier.Value, n);
}
else if (_currentScopeLevel == 2)
{
_currentMethodST.EnterSymbol(n.Identifier.Value, n);
}
return(null);
}
// we create variable declarings as public fields with generic getters and setters to adhere to the semantics of Deslang
public object Visit(VarDeclaringNode n, object o)
{
if (_currentScopeLevel == 1)
{
Append($"{AddIndent()}public ");
n.Type.Accept(this, null);
Append($" {n.Identifier.Value} {{ get; set; }}");
AppendLine();
}
else
{
Append($"{AddIndent()}");
n.Type.Accept(this, null);
Append($" {n.Identifier.Value};");
AppendLine();
}
return(null);
}
private VarDeclaringNode ParseVariableDeclaring()
{
VarDeclaringNode itsAST;
SourceCodePosition itsPos = _currentToken.SourcePosition;
Accept(Token.TokenType.Var);
TypeNode itsType = Type();
IdentifierNode itsName = new IdentifierNode(_currentToken, itsType);
Accept(Token.TokenType.Identifier);
itsAST = new VarDeclaringNode(itsName, itsType, itsPos);
if (_currentToken.Type == Token.TokenType.AssignmentOperator)
{
itsAST = new AssignedVarDeclaringNode(itsName, itsType, Assigning(), itsPos);
}
Accept(Token.TokenType.Semicolon);
return(itsAST);
}
private ActionNode IterationStatement()
{
ActionNode itsAST;
SourceCodePosition itsPos = _currentToken.SourcePosition;
if (_currentToken.Type == Token.TokenType.While)
{
Accept(Token.TokenType.While);
Accept(Token.TokenType.LeftParen);
ExpressionNode itsExpr = Expression();
Accept(Token.TokenType.RightParen);
Accept(Token.TokenType.LeftBrace);
ActionSequenceNode itsActions = ActionStatements();
Accept(Token.TokenType.RightBrace);
itsAST = new WhileActionNode(itsExpr, itsActions, itsPos);
}
else
{
Accept(Token.TokenType.Foreach);
Accept(Token.TokenType.LeftParen);
VarDeclaringNode itsDecl;
Accept(Token.TokenType.Var);
TypeNode itsType = Type();
IdentifierNode itsName = new IdentifierNode(_currentToken, itsType);
Accept(Token.TokenType.Identifier);
itsDecl = new VarDeclaringNode(itsName, itsType, itsPos);
Accept(Token.TokenType.In);
ExpressionNode itsExpr = Expression();
Accept(Token.TokenType.RightParen);
Accept(Token.TokenType.LeftBrace);
ActionSequenceNode itsActions = ActionStatements();
Accept(Token.TokenType.RightBrace);
itsAST = new ForeachActionNode(itsDecl, itsName, itsExpr, itsActions, itsPos);
}
return(itsAST);
}
