private JsFunctionDefinitionExpression GenerateStructGetHashCodeMethod(ITypeDefinition type)
{
JsExpression h = JsExpression.Identifier("h");
var stmts = new List <JsStatement>();
foreach (var f in type.Fields.Where(f => !f.IsStatic))
{
var expr = GetFieldHashCode(f);
if (expr != null)
{
if (stmts.Count == 0)
{
stmts.Add(JsStatement.Var("h", expr));
}
else
{
stmts.Add(JsExpression.Assign(h, JsExpression.BitwiseXor(JsExpression.Multiply(h, JsExpression.Number(397)), expr)));
}
}
}
switch (stmts.Count)
{
case 0:
stmts.Add(JsStatement.Return(JsExpression.Number(0)));
break;
case 1:
stmts[0] = JsStatement.Return(JsExpression.BitwiseOr(((JsVariableDeclarationStatement)stmts[0]).Declarations[0].Initializer, JsExpression.Number(0)));
break;
default:
stmts.Add(JsStatement.Return(h));
break;
}
return(JsExpression.FunctionDefinition(EmptyList <string> .Instance, JsStatement.Block(stmts)));
}