YExpr ProcessExpr(AssignmentExpressionSyntax assignmentExpression)
{
YExpr left = ProcessExpr(assignmentExpression.Left);
YExpr right = ProcessExpr(assignmentExpression.Right);
return(new YAssign(left, right));
}
YStatement ProcessStatement(IfStatementSyntax ifStatement)
{
YExpr condition = ProcessExpr(ifStatement.Condition);
YStatement statement = ProcessStatement(ifStatement.Statement);
YStatement elseStatement = ProcessStatement(ifStatement.Else.Statement);
return(new YIf(condition, statement, elseStatement));
}
YExpr ProcessExpr(MemberAccessExpressionSyntax memberAccessExpression)
{
YExpr expr = ProcessExpr(memberAccessExpression.Expression);
return(new YMemberAccessExpr(
expr,
memberAccessExpression.Name.Identifier.ToString()
));
}
/// <summary>
/// Unwrap expression to string.
/// </summary>
static public void AppendEx(this StringBuilder builder, YExpr expr)
{
if (expr is YConstExpr)
{
builder.Append("" + expr);
}
else if (expr is YThisExpr)
{
builder.Append("this");
}
else if (expr is YMemberAccessExpr)
{
var memberAccess = (YMemberAccessExpr)expr;
AppendEx(builder, memberAccess.Expression);
builder.Append("->"); // But what with "this."?
builder.Append(memberAccess.Name);
}
else if (expr is YIdentifierExpr)
{
builder.Append(((YIdentifierExpr)expr).Name);
}
else if (expr is YBinaryExpr)
{
var binary = (YBinaryExpr)expr;
AppendEx(builder, binary.Left);
builder.Append(" ");
AppendEx(builder, binary.Operator);
builder.Append(" ");
AppendEx(builder, binary.Right);
}
else if (expr is YLiteralExpr)
{
var literal = (YLiteralExpr)expr;
if (literal == YLiteralExpr.Null)
{
builder.Append("nullptr");
}
else
{
builder.Append(literal.Value);
}
}
else if (expr is YPrefixUnaryExpr)
{
var prefixUnari = (YPrefixUnaryExpr)expr;
AppendEx(builder, prefixUnari.Operator);
AppendEx(builder, prefixUnari.Operand);
}
else if (expr is YInvocation)
{
var invocation = (YInvocation)expr;
AppendEx(builder, invocation.Expression);
// no arguments
builder.Append("()");
}
else if (expr is YAssign)
{
var assign = (YAssign)expr;
AppendEx(builder, assign.Left);
builder.Append("=");
AppendEx(builder, assign.Right);
}
}
public YMemberAccessExpr(YExpr expression, string name)
{
Expression = expression;
Name = name;
}
public YIf(YExpr condition, YStatement statement, YStatement elseStatement)
{
Condition = condition;
Statement = statement;
ElseStatement = elseStatement;
}
public YAssign(YExpr left, YExpr right)
{
Left = left;
Right = right;
}
public YPrefixUnaryExpr(YOperator @operator, YExpr operand)
{
Operator = @operator;
Operand = operand;
}
public YInvocation(YExpr expression)
{
Expression = expression;
}
public YBinaryExpr(YExpr left, YExpr right, YOperator operation)
{
Left = left;
Right = right;
Operator = operation;
}
public YReturn(YExpr value)
{
Value = value;
}
public YExprStatement(YExpr expression)
{
Expression = expression;
}