(java) Add support for java functions

lua/neogen/configurations/java.lua

@@ -1,9 +1,65 @@
 return {
     parent = {
         class = { "class_declaration" },
+        func = { "method_declaration" },
     },
 
     data = {
+        func = {
+            ["method_declaration"] = {
+                ["0"] = {
+                    extract = function(node)
+                        local results = {}
+                        local tree = {
+                            {
+                                retrieve = "first",
+                                node_type = "formal_parameters",
+                                subtree = {
+                                    {
+                                        retrieve = "all",
+                                        node_type = "formal_parameter",
+                                        subtree = {
+                                            { retrieve = "all", node_type = "identifier", extract = true },
+                                        },
+                                    },
+                                },
+                            },
+                            {
+                                retrieve = "first",
+                                node_type = "block",
+                                subtree = {
+                                    { retrieve = "first", node_type = "return_statement", extract = true },
+                                    {
+                                        retrieve = "first",
+                                        node_type = "try_statement",
+                                        subtree = {
+                                            {
+                                                retrieve = "first",
+                                                node_type = "block",
+                                                subtree = {
+                                                    {
+                                                        retrieve = "first",
+                                                        node_type = "return_statement",
+                                                        extract = true,
+                                                    },
+                                                },
+                                            },
+                                        },
+                                    },
+                                },
+                            },
+                        }
+
+                        local nodes = neogen.utilities.nodes:matching_nodes_from(node, tree)
+                        local res = neogen.utilities.extractors:extract_from_matched(nodes)
+
+                        results.parameters = res.identifier
+                        results.return_statement = res.return_statement
+                        return results
+                    end,
+                },
+            },
+        },
         class = {
             ["class_declaration"] = {
                 ["0"] = {
@@ -27,7 +83,9 @@ return {
 
         javadoc = {
             { nil, "/**" },
-            { "class_name", " * %s $1" },
+            { nil, " * %s $1" },
+            { "parameters", " * @param %s $1" },
+            { "return_statement", " * @return $1" },
             { nil, " */" },
         },
     },