Class: Markbridge::Processors::DiscourseMarkdown::Detectors::Event

Inherits:
Base
  • Object
show all
Defined in:
lib/markbridge/processors/discourse_markdown/detectors/event.rb

Overview

Detects Discourse event blocks [event]….

Examples:

detector = Event.new
input = '[event name="Meeting" start="2025-12-15 14:00"][/event]'
match = detector.detect(input, 0)
match.node.name # => "Meeting"

Constant Summary collapse

OPEN_TAG_PATTERN = 
/\[event(?<attrs>[^\]]*)\]/i
CLOSE_TAG_PATTERN = 
%r{\[/event\]}i

Instance Method Summary collapse

Instance Method Details

#detect(input, pos) ⇒ Match?

Attempt to detect an event at the given position.

Parameters:

  • input (String) —

    the full input string

  • pos (Integer) —

    current position to check

Returns:

  • (Match, nil) —

    match result or nil if no match



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# File 'lib/markbridge/processors/discourse_markdown/detectors/event.rb', line 23

def detect(input, pos)
  remaining = input[pos..]
  open_match = OPEN_TAG_PATTERN.match(remaining)
  return nil unless open_match&.begin(0)&.zero?

  # Find closing tag. The opening tag pattern forbids `]` between
  # `[event` and its closing `]`, so `[/event]` cannot appear inside
  # the opening tag - no need to skip past it.
  close_match = CLOSE_TAG_PATTERN.match(remaining)
  return nil unless close_match

  # Extract raw content
  end_pos = pos + close_match.end(0)
  raw = input[pos...end_pos]

  # Parse attributes from opening tag
  attrs = parse_attributes(open_match[:attrs])

  # Validate required attributes
  name = attrs["name"]
  starts_at = attrs["start"]
  return nil if name.nil? || starts_at.nil?

  node =
    AST::Event.new(
      name:,
      starts_at:,
      ends_at: attrs["end"],
      status: attrs["status"],
      timezone: attrs["timezone"],
      raw:,
    )

  Match.new(start_pos: pos, end_pos:, node:)
end