從 lark-parser 返回的 AST 中刪除正則表達式終端

Question

我有興趣使用lark解析網站爬蟲的典型 output 。 這是基於我自己的 github 網站的一些示例 output 的示例：

--------------------------------------------------------------------
All found URLs:
https://awa5114.github.io/2021/01/12/#step-2-select-location-and-environment-for-new-project
https://awa5114.github.io/2021/01/12/mypy-pycharm.html
https://awa5114.github.io/2021/01/12/#step-6-test-the-template-on-a-script
--------------------------------------------------------------------
All local URLs:
https://awa5114.github.io/2021/01/12/#step-2-select-location-and-environment-for-new-project
https://awa5114.github.io/2021/01/12/mypy-pycharm.html
--------------------------------------------------------------------
All foreign URLs:
https://github.com/awa5114
https://github.com/jekyll/jekyll
https://github.com/jekyll/minima
--------------------------------------------------------------------
All broken URLs:

我正在使用以下語法：

start: section~4
section: (bar  "All " descriptor " URLs:"  link_list)
link_list: (url)*
descriptor: "found" | "local" | "foreign" | "broken"
url: /.+/
bar: /-{68}/

%import common.NEWLINE
%ignore NEWLINE

在結果樹上調用pretty會產生以下結果：

start
  section
    bar --------------------------------------------------------------------
    descriptor
    link_list
      url   https://awa5114.github.io/2021/01/12/#step-2-select-location-and-environment-for-new-project
      url   https://awa5114.github.io/2021/01/12/mypy-pycharm.html
      url   https://awa5114.github.io/2021/01/12/#step-6-test-the-template-on-a-script
  section
    bar --------------------------------------------------------------------
    descriptor
    link_list
      url   https://awa5114.github.io/2021/01/12/#step-2-select-location-and-environment-for-new-project
      url   https://awa5114.github.io/2021/01/12/mypy-pycharm.html
  section
    bar --------------------------------------------------------------------
    descriptor
    link_list
      url   https://github.com/awa5114
      url   https://github.com/jekyll/jekyll
      url   https://github.com/jekyll/minima
  section
    bar --------------------------------------------------------------------
    descriptor
    link_list

這看起來沒問題，但我不想在我的樹中包含終端bar 。 我怎樣才能做到這一點？ 我瀏覽了文檔並嘗試使用下划線和/或問號在前面的bar ，但由於某種原因，這無濟於事......

Answer 1

其實我現在才發現。 做到這一點的方法不僅是在bar前面加上下划線，而且將其變為大寫，如下所示：

start: section~4
section: (_BAR  "All " descriptor " URLs:"  link_list)
link_list: (url)*
descriptor: "found" | "local" | "foreign" | "broken"
url: /.+/
_BAR: /-{68}/

%import common.NEWLINE
%ignore NEWLINE

這導致以下樹：

start
  section
    descriptor
    link_list
      url   https://awa5114.github.io/2021/01/12/#step-2-select-location-and-environment-for-new-project
      url   https://awa5114.github.io/2021/01/12/mypy-pycharm.html
      url   https://awa5114.github.io/2021/01/12/#step-6-test-the-template-on-a-script
  section
    descriptor
    link_list
      url   https://awa5114.github.io/2021/01/12/#step-2-select-location-and-environment-for-new-project
      url   https://awa5114.github.io/2021/01/12/mypy-pycharm.html
  section
    descriptor
    link_list
      url   https://github.com/awa5114
      url   https://github.com/jekyll/jekyll
      url   https://github.com/jekyll/minima
  section
    descriptor
    link_list

如果在lark-parser文檔中明確這一點會很好......