private BoundExpression BindNameExpression(NameExpressionSyntax syntax)
{
var name = syntax.IdentifierToken.Text;
if (!_scope.TryLookup(name, out var variable))
{
_diagnostics.ReportUndefinedName(syntax.IdentifierToken.Span, name);
return(new BoundLiteralExpression(0));
}
return(new BoundVariableExpression(variable));
}
private BoundExpression BindNameExpression(NameExpressionSyntax syntax)
{
var name = syntax.IdentifierToken.Text;
if (string.IsNullOrEmpty(name))
{
// This means the token was inserted by the parser. We already
// reported error so we can just return an error expression.
return(new BoundLiteralExpression(0));
}
if (!_scope.TryLookup(name, out var variable))
{
_diagnostics.ReportUndefinedName(syntax.IdentifierToken.Span, name);
return(new BoundLiteralExpression(0));
}
return(new BoundVariableExpression(variable));
}
private BoundExpression BindAssignmentExpression(AssignmentExpressionSyntax syntax)
{
var name = syntax.IdentifierToken.Text;
var boundExpression = BindExpression(syntax.Expression);
var boundType = boundExpression.Type;
if (!_scope.TryLookup(name, out var variable))
{
_diagnostics.ReportUndefinedName(syntax.IdentifierToken.Span, name);
return(boundExpression);
}
if (variable.IsReadOnly)
{
_diagnostics.ReportCannotAssign(syntax.EqualsToken.Span, name);
}
if (boundExpression.Type != variable.Type)
{
_diagnostics.ReportCannotConvert(syntax.Expression.Span, boundExpression.Type, variable.Type);
return(boundExpression);
}
return(new BoundAssignmentExpression(variable, boundExpression));
}
