/****************************************************************
* Read Node
***************************************************************/
public Node Read()
{
var rdResult = new Read()
{
AnchorToken = Expect(TokenCategory.READ)
};
if (this.labelCache != null)
{
rdResult.Add(this.labelCache);
this.labelCache = null;
}
Expect(TokenCategory.PARENTHESIS_OPEN);
Expect(TokenCategory.MUL);
Expect(TokenCategory.COMMA);
Expect(TokenCategory.MUL);
Expect(TokenCategory.PARENTHESIS_CLOSE);
var readTo = new Identifier()
{
AnchorToken = Expect(TokenCategory.IDENTIFIER)
};
if (CurrentToken == TokenCategory.PARENTHESIS_OPEN)
{
readTo.Add(ArrayDeclaration());
}
rdResult.Add(readTo);
while (firstOfMultipleDeclarations.Contains(CurrentToken))
{
if (CurrentToken == TokenCategory.PARENTHESIS_OPEN)
{
readTo.Add(ArrayDeclaration());
rdResult.Add(readTo);
}
else if (CurrentToken == TokenCategory.COMMA)
{
Expect(TokenCategory.COMMA);
readTo = new Identifier()
{
AnchorToken = Expect(TokenCategory.IDENTIFIER)
};
if (CurrentToken != TokenCategory.PARENTHESIS_OPEN)
{
rdResult.Add(readTo);
}
}
}
return(rdResult);
}
/// <summary>
/// Ctor of the action configuration model.
/// </summary>
public OpcActionConfigurationModel(ReadActionModel action, string endpointUrl = null, bool useSecurity = true)
{
Init();
EndpointUrl = new Uri(endpointUrl ?? DefaultEndpointUrl);
UseSecurity = useSecurity;
Read.Add(new ReadActionModel(action));
}
private void ReceivedData(IAsyncResult ar)
{
RequestState rs = ar.AsyncState as RequestState;
HttpWebRequest req = rs.Req;
Stream resStream = rs.ResStream;
string url = rs.Url;
int depth = rs.Depth;
string html = string.Empty;
int read = 0;
try
{
read = resStream.EndRead(ar);
if (Stop)
{
rs.ResStream.Close();
req.Abort();
return;
}
if (read > 0)
{
MemoryStream ms = new MemoryStream(rs.Data, 0, read); //创建内存流
StreamReader reader = new StreamReader(ms, mEncoding);
string str = reader.ReadToEnd(); //读取全部字符串
rs.Html.Append(str);
var result = resStream.BeginRead(rs.Data, 0, rs.BufferSize, new AsyncCallback(ReceivedData), rs); //再次请求数据
return;
}
html = rs.Html.ToString();
bool isRedis = Convert.ToBoolean(RedisCommon.GetConfig("IsRedis"));
if (!isRedis)
{
SaveContents(html, url);//保存到本地
}
else
{
mRedisCommon.SetValue(url, html);
}
string[] links = GetLinks(html); //获取页面中的链接
Read.Add(url, depth); //添加到已经下载集合
AddUrl(links, depth + 1);
Unread.Remove(url); //移除未下载
mRedisCommon.SetValue(url, url);
DispatchWork();
}
catch (Exception ex)
{
//MessageBox.Show(ex.Message);
}
}
private IStatement CallRead()
{
if (Accept(Symbol.ReadProcedure))
{
Require(Symbol.ClosureOpen);
Read read = new Read();
do
{
Identifier ident = Identifier();
if (ident == null)
{
throw new SyntaxException(expIdentifier, current);
}
VariableReference varRef = ReadVariableReference(ident);
AssigmentStatement assigment = new AssigmentStatement(varRef, new Reading(ident));
read.Add(assigment);
} while (Accept(Symbol.Comma));
Require(Symbol.ClosureClose);
return(read);
}
return(null);
}