function val=jsonopt(key,default,varargin)
%
% val=jsonopt(key,default,optstruct)
%
% setting options based on a struct. The struct can be produced
% by varargin2struct from a list of 'param','value' pairs
%
% author: Qianqian Fang, <q.fang at neu.edu>
%
% $Id: loadjson.m 371 2012-06-20 12:43:06Z fangq $
%
% input:
%      key: a string with which one look up a value from a struct
%      default: if the key does not exist, return default
%      optstruct: a struct where each sub-field is a key 
%
% output:
%      val: if key exists, val=optstruct.key; otherwise val=default
%
% license:
%     BSD or GPL version 3, see LICENSE_{BSD,GPLv3}.txt files for details
%
% -- this function is part of JSONlab toolbox (http://iso2mesh.sf.net/cgi-bin/index.cgi?jsonlab)
% 

val=default;
if(nargin<=2) return; end
opt=varargin{1};
if(isstruct(opt))
    if(isfield(opt,key))
       val=getfield(opt,key);
    elseif(isfield(opt,lower(key)))
       val=getfield(opt,lower(key));
    end
end
