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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`
class TaskListToggleService
attr_reader :updated_markdown, :updated_markdown_html
def initialize(markdown, markdown_html, line_source:, line_number:, toggle_as_checked:)
@markdown = markdown
@markdown_html = markdown_html
@line_source = line_source
@line_number = line_number
@toggle_as_checked = toggle_as_checked
@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, :toggle_as_checked
attr_reader :line_source, :line_number
def toggle_markdown
source_lines = markdown.split("\n")
source_line_index = line_number - 1
markdown_task = source_lines[source_line_index]
# The source in the DB could be using either \n or \r\n line endings
return unless markdown_task.chomp == line_source
return unless source_checkbox = Taskable::ITEM_PATTERN.match(markdown_task)
currently_checked = TaskList::Item.new(source_checkbox[2]).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
elsif toggle_as_checked
markdown_task.sub!(Taskable::INCOMPLETE_PATTERN, '[x]')
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.
def get_html_checkbox(html)
html.css(".task-list-item[data-sourcepos^='#{line_number}:'] input.task-list-item-checkbox").first
end
end
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