完成了一个层级的匹配

apps/modbus/src/modbus_parser.erl

@@ -11,6 +11,11 @@
 -export([parse/1, parse_file/1]).
 -include("modbus_ast.hrl").
 
+-record(block, {
+    ident :: binary(),
+    props = []
+}).
+
 %% 主解析函数
 parse(Input) when is_binary(Input) ->
     Tokens = lexer(Input),
@@ -95,19 +100,22 @@ display_tokens(Tokens) ->
 parser_block0([{comment, _, _}|Tokens]) ->
     parser_block0(Tokens);
 parser_block0([{ident, _, Ident}, {special, _, ${}|Tokens]) ->
-    parser_block0(Tokens, {block, Ident, []}).
-
+    parser_block0(Tokens, #block{ident = Ident}).
+%% 这里只是开启了一个新的子元素
+parser_block0([{ident, _, Ident}, {special, _, ${}|Tokens], B = #block{props = Props}) ->
+    {ResetTokens, B0} = parser_block0(Tokens, #block{ident = Ident, props = []}),
+    parser_block0(ResetTokens, B#block{props = [B0|Props]});
 %% 这里很重要，要到Block的关闭字符
-parser_block0([{special, _, $}}|Tokens], B) ->
-    {Tokens, B};
+parser_block0([{special, _, $}}|Tokens], B = #block{props = Props}) ->
+    {Tokens, B#block{props = lists:reverse(Props)}};
 parser_block0([{special, _, $;}|Tokens], B) ->
     parser_block0(Tokens, B);
 %% 处理空的定义
 parser_block0([{ident, _, <<>>}|Tokens], B) ->
     parser_block0(Tokens, B);
 %% 其他定义，是基于: port /dev/ttyUSB0; 这样的格式的
-parser_block0([{ident, _Line, Prop}, {special, _, $;}|Tokens], {block, Block, Props}) ->
-    parser_block0(Tokens, {block, Block, [Prop|Props]});
+parser_block0([{ident, _Line, Prop}, {special, _, $;}|Tokens], B = #block{props = Props}) ->
+    parser_block0(Tokens, B#block{props = [Prop|Props]});
 %% 忽略掉注释信息
 parser_block0([{comment, _, _}|Tokens], B) ->
     parser_block0(Tokens, B).