// ===== ===== ===== ===== ===== method ===== ===== ===== ===== =====
public ExprParamPair Generate(Defun stmt)
{
Contract.Requires <ArgumentNullException>(stmt != null);
// prepare
var funcType = ExpressionHelper.GetFuncType(stmt.Params.Count);
var sfxFuncType = typeof(SuffixFunc <>).MakeGenericType(funcType);
var funcTarget = Expression.Parameter(sfxFuncType, stmt.Name);
var ps = ParamList.FromEnum(stmt.Params.Select(p => Expression.Parameter(typeof(object), p.Name)));
_parameters = new ParamList(funcTarget, ps);
// generate block
var gen = new BlockGen(this);
var block = gen.Generate(stmt.Block);
// crean up
var lambda = Expression.Lambda(block, stmt.Name, ParamList.ToEnum(_parameters.Next));
var ctorInfo = sfxFuncType.GetConstructor(new[] { funcType, typeof(string[]) });
var sfxs = stmt.Params.Select(pair => pair.Suffix).ToArray();
var createExpr = Expression.New(ctorInfo, lambda, Expression.Constant(sfxs));
return(new ExprParamPair(Expression.Assign(funcTarget, createExpr), new ParamList(funcTarget, null)));
}
