private Symbol VisitForStatement(ASTFor node)
{
Logger.DebugScope($"Enter scope : for");
var whileScope = new ScopedSymbolTable("for", _currentScope.Level + 1, _currentScope);
_currentScope = whileScope;
foreach (var assign in node.Assignments)
{
Visit(assign);
}
if (node.Condition != null)
{
Visit(node.Condition);
}
foreach (var statement in node.ContinueStatements)
{
Visit(statement);
}
var returnType = Visit(node.Body);
DebugPrintSymbolTable();
_currentScope = _currentScope.EnclosingScope;
Logger.DebugScope($"Leave scope : for");
return(returnType);
}
public ScopedSymbolTable(string scopeName, uint scopeLevel, ScopedSymbolTable enclosingScope = null)
{
Name = scopeName;
Level = scopeLevel;
EnclosingScope = enclosingScope;
InitializeArrayTypes();
InitializeBuiltinFunctions();
}
private Symbol VisitElifStatement(ASTElif node)
{
var conditionType = Visit(node.Condition);
if (conditionType.Name != "bool")
{
ThrowIncompatibleTypesException(node.Token, conditionType.Name, "bool");
}
Logger.DebugScope($"Enter scope : elif");
var ifScope = new ScopedSymbolTable("if", _currentScope.Level + 1, _currentScope);
_currentScope = ifScope;
var returnType = Visit(node.IfTrue);
DebugPrintSymbolTable();
_currentScope = _currentScope.EnclosingScope;
Logger.DebugScope($"Leave scope : elif");
return(returnType);
}
private Symbol VisitWhileStatement(ASTWhile node)
{
var conditionType = Visit(node.Condition);
if (conditionType.Name != "bool")
{
ThrowIncompatibleTypesException(node.Token, conditionType.Name, "bool");
}
Logger.DebugScope($"Enter scope : while");
var whileScope = new ScopedSymbolTable("while", _currentScope.Level + 1, _currentScope);
_currentScope = whileScope;
var returnType = Visit(node.Body);
DebugPrintSymbolTable();
_currentScope = _currentScope.EnclosingScope;
Logger.DebugScope($"Leave scope : while");
return(returnType);
}
private Symbol VisitIfElseStatement(ASTIfElse node)
{
var conditionType = Visit(node.Condition);
if (conditionType.Name != "bool")
{
ThrowIncompatibleTypesException(node.Token, conditionType.Name, "bool");
}
Logger.DebugScope($"Enter scope : if");
var ifScope = new ScopedSymbolTable("if", _currentScope.Level + 1, _currentScope);
_currentScope = ifScope;
var returnType = Visit(node.IfTrue);
DebugPrintSymbolTable();
_currentScope = _currentScope.EnclosingScope;
Logger.DebugScope($"Leave scope : if");
foreach (var elif in node.Elifs)
{
var elifType = Visit(elif);
if (returnType is null)
{
returnType = elifType;
}
if (returnType != elifType)
{
ThrowIncompatibleTypesException(node.Token, returnType.Name, elifType.Name);
}
}
if (node.Else != null)
{
Logger.DebugScope($"Enter scope : else");
var elseScope = new ScopedSymbolTable("else", _currentScope.Level + 1, _currentScope);
_currentScope = elseScope;
var elseType = Visit(node.Else);
if (returnType is null)
{
returnType = elseType;
}
if (returnType != elseType)
{
ThrowIncompatibleTypesException(node.Token, returnType.Name, elseType.Name);
}
DebugPrintSymbolTable();
_currentScope = _currentScope.EnclosingScope;
Logger.DebugScope($"Leave scope : else");
}
return(returnType);
}