action_text.cr

A 1:1 Crystal port of actiontext 8.1.4 (the Rails rich-text editing component, namespace ActionText). Implements the has_rich_text attribute macro with autosave, the action_text_rich_texts store, and the ActionText::Content pipeline: HTML fragment parsing/serialization, plain-text conversion, safe-list sanitization (safe list taken verbatim from rails-html-sanitizer 1.7.1 plus the action-text attachment tags) and the trix-content layout render — byte-identical to the gem. Suite: 48/48 oracle cases recorded from actiontext 8.1.4 and replayed without edits.

⚠️ EXPERIMENTAL FRAMEWORK, DO NOT USE IN PRODUCTION YET.

Installation

dependencies:
  action_text_cr:
    github: OrelSokolov/action_text.cr

shards install

Depends on active_record_cr and the lexbor shard.

Usage

require "action_text_cr"

class Message < ActiveRecord::Base
  has_rich_text :body
end

message = Message.create!(body: "<h1>Hello</h1><div>World<a href='x'>l</a></div>")
message.body.to_s           # "<div class=\"trix-content\">\n  ...\n</div>\n"
message.body.to_plain_text  # block/br/quote/list rules, chomp("") semantics
message.body.to_body_content.links  # ["x"]
message.body?               # true (non-blank plain text)

Feature comparison vs actiontext 8.1.4

Rich text attribute & persistence

Feature	Original (actiontext)	Port (action_text.cr)	Status
has_rich_text :name — getter / setter / presence	✅	Macro generating body / body= / body?	✅
Autosave of the RichText row with its owner	✅	after_create / after_update callbacks	✅
create! / create accepting the rich-text key in the attribute hash	✅	Key pulled out before AR create runs	✅
action_text_rich_texts store (name/body/record_type/record_id)	✅	RichText row class over Base.connection	⚠️ partial (hand-rolled, not a full AR model)
with_rich_text_* scope / eager loading	✅	❌	❌

Content pipeline & rendering

Feature	Original	Port	Status
Content#to_s — trix-content layout render	✅	Static layout: <div class="trix-content">\n …\n</div>\n	✅
Content#to_plain_text	✅	Bottom-up rules 1:1 (block/br/div/figcaption/blockquote quotes/ul-ol-li with indentation, chomp(""))	✅
Content#to_html, #links	✅	Same (lexbor serialization 1:1 with Nokogiri HTML5)	✅
Serialization (Content.load / .dump)	✅	Same	✅
Sanitization (Rails::HTML4 safe-list + attachment tags, unwrap-keep-content)	✅	Safe list verbatim from rails-html-sanitizer 1.7.1	✅
Content#to_markdown	✅	❌	❌ (P2)
RichText#to_editor_html / Trix conversion	✅	❌	❌ (P1)

Attachments & views

Feature	Original	Port	Status
<action-text-attachment sgid=…> resolution (sgid → allowed classes)	✅	❌	❌ (P1)
ActiveStorage blob attachments in content, attachment galleries	✅	❌	❌ (P1/P2)
Custom render partial app/views/action_text/contents/_content	✅	❌	❌ (P1)
content.html direct render	✅	❌	❌
encrypted: true rich text	✅	❌	❌ (P2)
Trix editor	client-side JS	Not ported — browser JS works as-is	✅ (n/a)

Deviations & Crystal-specific notes

• RichText is a hand-rolled row class on ActiveRecord::Base.connection, not a full ActiveRecord model — the AR codegen would override #to_s / #body with attribute accessors (later defs win in Crystal).
• RichText#body is the raw HTML string exactly as stored in the DB; get the Content object via to_body_content.
• HTML fragment transformations run on lexbor instead of Nokogiri; serialization output is 1:1 with the Nokogiri HTML5 oracle.
• The sanitizer reproduces the libxml2 \n artifact only for the unwrap of a trailing script/style child (the oracle cases cover this).

Full list with rationale: PLAN.md (Russian).

Testing

make spec    # crystal spec --link-flags="-lm"; lexbor needs libm at link time

Requires a local PostgreSQL (override with AT_TEST_URL). Oracle: 48 cases recorded with the real actiontext 8.1.4 (oracle/cases.rb → oracle/expected.yml, SQLite in-memory on the Ruby side); the Crystal spec spec/oracle_spec.cr replays them 1:1 without edits — 48/48.