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# frozen_string_literal: true
# Finds the correct checkbox in the passed in markdown/html and toggles it's state,
# returning the updated markdown/html.
# We don't care if the text has changed above or below the specific checkbox, as long
# the checkbox still exists at exactly the same line number and the text is equal.
# If successful, new values are available in `updated_markdown` and `updated_markdown_html`
#
# Note: once we've removed RedCarpet support, we can remove the `index` and `sourcepos`
# parameters
class TaskListToggleService
attr_reader :updated_markdown, :updated_markdown_html
def initialize(markdown, markdown_html, line_source:, line_number:, toggle_as_checked:, index:, sourcepos: true)
@markdown, @markdown_html = markdown, markdown_html
@line_source, @line_number = line_source, line_number
@toggle_as_checked = toggle_as_checked
@index, @use_sourcepos = index, sourcepos
@updated_markdown, @updated_markdown_html = nil
end
def execute
return false unless markdown && markdown_html
toggle_markdown && toggle_markdown_html
end
private
attr_reader :markdown, :markdown_html, :index, :toggle_as_checked
attr_reader :line_source, :line_number, :use_sourcepos
def toggle_markdown
source_lines = markdown.split("\n")
source_line_index = line_number - 1
markdown_task = source_lines[source_line_index]
return unless markdown_task == line_source
return unless source_checkbox = Taskable::ITEM_PATTERN.match(markdown_task)
currently_checked = TaskList::Item.new(source_checkbox[1]).complete?
# Check `toggle_as_checked` to make sure we don't accidentally replace
# any `[ ]` or `[x]` in the middle of the text
if currently_checked
markdown_task.sub!(Taskable::COMPLETE_PATTERN, '[ ]') unless toggle_as_checked
else
markdown_task.sub!(Taskable::INCOMPLETE_PATTERN, '[x]') if toggle_as_checked
end
source_lines[source_line_index] = markdown_task
@updated_markdown = source_lines.join("\n")
end
def toggle_markdown_html
html = Nokogiri::HTML.fragment(markdown_html)
html_checkbox = get_html_checkbox(html)
return unless html_checkbox
if toggle_as_checked
html_checkbox[:checked] = 'checked'
else
html_checkbox.remove_attribute('checked')
end
@updated_markdown_html = html.to_html
end
# When using CommonMark, we should be able to use the embedded `sourcepos` attribute to
# target the exact line in the DOM. For RedCarpet, we need to use the index of the checkbox
# that was checked and match it with what we think is the same checkbox.
# The reason `sourcepos` is slightly more reliable is the case where a line of text is
# changed from a regular line into a checkbox (or vice versa). Then the checked index
# in the UI will be off from the list of checkboxes we've calculated locally.
# It's a rare circumstance, but since we can account for it, we do.
def get_html_checkbox(html)
if use_sourcepos
html.css(".task-list-item[data-sourcepos^='#{line_number}:'] > input.task-list-item-checkbox").first
else
html.css('.task-list-item-checkbox')[index - 1]
end
end
end
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