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  <author_name>E_Mattsan</author_name>
  <author_url>https://blog.hatena.ne.jp/E_Mattsan/</author_url>
  <blog_title>エンジニアのソフトウェア的愛情</blog_title>
  <blog_url>https://blog.emattsan.org/</blog_url>
  <categories>
    <anon>めも</anon>
    <anon>Ruby</anon>
    <anon>PEG</anon>
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  <description>昨日のエントリの続き。サブクラスを定義する。 calc.tt grammar Arithmetic rule additive multitive r:( op:[+-] multitive )* &lt;Additive&gt; end rule multitive primary r:( op:[*/%] primary )* &lt;Multitive&gt; end rule primary '(' additive ')' &lt;Parenthesized&gt; / number end rule number '-'? [1-9] [0-9]* &lt;Number&gt; end endcalc.rb require 't…</description>
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  <provider_name>Hatena Blog</provider_name>
  <provider_url>https://hatena.blog</provider_url>
  <published>2013-08-16 22:53:06</published>
  <title>パーサ、なんどでも、なんどでも</title>
  <type>rich</type>
  <url>https://blog.emattsan.org/entry/20130816/1376661186</url>
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