[#665,!460] Implemented support in netconf agent

doc/examples/netconf/simple-dhcp4.json
doc/examples/netconf/simple-dhcp6.json

src/bin/netconf/netconf_lexer.ll
src/bin/netconf/netconf_parser.yy

src/bin/netconf/location.hh
src/bin/netconf/netconf_lexer.cc
src/bin/netconf/netconf_parser.cc
src/bin/netconf/netconf_parser.h
src/bin/netconf/position.hh
src/bin/netconf/stack.hh

doc/examples/netconf/simple-dhcp4.json

@@ -102,7 +102,9 @@
                         // kept.
                         "flush": true,
                         "maxsize": 204800,
-                        "maxver": 4
+                        "maxver": 4,
+                         // We use pattern to specify custom log message layout
+                        "pattern": "%d{%y.%m.%d %H:%M:%S.%q} %-5p [%c/%i] %m\n"
                     }
                 ],
                 // You can change the severity to DEBUG, INFO, WARN, ERROR or

doc/examples/netconf/simple-dhcp6.json

@@ -103,7 +103,10 @@
                         // kept.
                         "flush": true,
                         "maxsize": 204800,
-                        "maxver": 4
+                        "maxver": 4,
+                        // We use pattern to specify custom log message layout
+                        "pattern": "%d{%y.%m.%d %H:%M:%S.%q} %-5p [%c/%i] %m\n"
+ 
                     }
                 ],
                 // You can change the severity to DEBUG, INFO, WARN, ERROR or

src/bin/netconf/location.hh

@@ -1,9 +1,8 @@
-// Generated 201906181715
-// A Bison parser, made by GNU Bison 3.4.1.
+// A Bison parser, made by GNU Bison 3.2.1.
 
 // Locations for Bison parsers in C++
 
-// Copyright (C) 2002-2015, 2018-2019 Free Software Foundation, Inc.
+// Copyright (C) 2002-2015, 2018 Free Software Foundation, Inc.
 
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -55,10 +54,9 @@
 #  endif
 # endif
 
-#line 14 "netconf_parser.yy"
+#line 14 "netconf_parser.yy" // location.cc:339
 namespace isc { namespace netconf {
-#line 60 "location.hh"
-
+#line 60 "location.hh" // location.cc:339
   /// A point in a source file.
   class position
   {
@@ -318,8 +316,7 @@ namespace isc { namespace netconf {
     return ostr;
   }
 
-#line 14 "netconf_parser.yy"
+#line 14 "netconf_parser.yy" // location.cc:339
 } } // isc::netconf
-#line 323 "location.hh"
-
+#line 322 "location.hh" // location.cc:339
 #endif // !YY_NETCONF_LOCATION_HH_INCLUDED

src/bin/netconf/netconf_lexer.ll

@@ -453,6 +453,15 @@ ControlCharacterFill            [^"\\]|\\{JSONEscapeSequence}
     }
 }
 
+\"pattern\" {
+    switch(driver.ctx_) {
+    case ParserContext::OUTPUT_OPTIONS:
+        return NetconfParser::make_PATTERN(driver.loc_);
+    default:
+        return NetconfParser::make_STRING("pattern", driver.loc_);
+    }
+}
+
 \"debuglevel\" {
     switch(driver.ctx_) {
     case ParserContext::LOGGERS:

src/bin/netconf/netconf_parser.yy

@@ -85,6 +85,7 @@ using namespace std;
   FLUSH "flush"
   MAXSIZE "maxsize"
   MAXVER "maxver"
+  PATTERN "pattern"
 
   // Not real tokens, just a way to signal what the parser is expected to
   // parse. This define the starting point. It either can be full grammar
@@ -673,6 +674,7 @@ output_params: output
              | flush
              | maxsize
              | maxver
+             | pattern
              ;
 
 output: OUTPUT {
@@ -698,6 +700,14 @@ maxver: MAXVER COLON INTEGER {
     ctx.stack_.back()->set("maxver", maxver);
 };
 
+pattern: PATTERN {
+    ctx.enter(ctx.NO_KEYWORDS);
+} COLON STRING {
+    ElementPtr sev(new StringElement($4, ctx.loc2pos(@4)));
+    ctx.stack_.back()->set("pattern", sev);
+    ctx.leave();
+};
+
 %%
 
 void

src/bin/netconf/position.hh

@@ -1,5 +1,4 @@
-// Generated 201906181715
-// A Bison parser, made by GNU Bison 3.4.1.
+// A Bison parser, made by GNU Bison 3.2.1.
 
 // Starting with Bison 3.2, this file is useless: the structure it
 // used to define is now defined in "location.hh".

src/bin/netconf/stack.hh

@@ -1,5 +1,4 @@
-// Generated 201906181715
-// A Bison parser, made by GNU Bison 3.4.1.
+// A Bison parser, made by GNU Bison 3.2.1.
 
 // Starting with Bison 3.2, this file is useless: the structure it
 // used to define is now defined with the parser itself.