Commits on Mar 15, 2021

1. ci: add ragel to macos

   

   flavorjones committed Mar 15, 2021
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2. feat: Nokogumbo detects Nokogiri's HTML5 API …

   Closes #170
   
   A future version of Nokogiri will provide Nokogumbo's API (see
   sparklemotion/nokogiri#2204). This change
   will allow Nokogumbo to detect whether Nokogiri provides the HTML5 API
   and whether to use Nokogiri's implementation or Nokogumbo's
   implementation.
   
   Some contractual assumptions I'm making about Nokogiri:
   
   - Nokogiri will faithfully reproduce the `::Nokogiri::HTML5` singleton
     method, module, and namespace (including classes
     `Nokogiri::HTML5::Node`, `Nokogiri::HTML5::Document`, and
     `Nokogiri::HTML5::DocumentFragment`)
   
   - Nokogiri will not provide a `::Nokogumbo` module/namespace, but will
     provide a similar `::Nokogiri::Gumbo` module which will provide the
     same public API as `::Nokogumbo`.
   
   This change checks for the existence of `Nokogiri::HTML5`,
   `Nokogiri::Gumbo`, and an expected singleton method on each. We could
   do a more- or less-thorough check here.
   
   This change also provides an "escape hatch" using an environment
   variable `NOKOGUMBO_IGNORE_NOKOGIRI_HTML5` which can be set to force
   Nokogumbo to use its own implementation. This escape hatch might be
   unnecessary, but this change is invasive enough to make me want to be
   cautious.
   
   Nokogumbo will emit a single warning message at `require`-time when it
   is uses Nokogiri's implementation. This message points users to
   sparklemotion/nokogiri#2205 which will
   explain what's going on and help people migrate their
   applications (but is an empty placeholder right now).

   

   flavorjones committed Mar 15, 2021
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