276 lines
7.8 KiB
Ruby
276 lines
7.8 KiB
Ruby
require 'nokogiri'
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module MarkupHelper
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include ActionView::Helpers::TagHelper
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include ActionView::Context
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def plain?(filename)
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Gitlab::MarkupHelper.plain?(filename)
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end
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def markup?(filename)
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Gitlab::MarkupHelper.markup?(filename)
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end
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def gitlab_markdown?(filename)
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Gitlab::MarkupHelper.gitlab_markdown?(filename)
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end
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def asciidoc?(filename)
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Gitlab::MarkupHelper.asciidoc?(filename)
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end
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# Use this in places where you would normally use link_to(gfm(...), ...).
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def link_to_markdown(body, url, html_options = {})
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return '' if body.blank?
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link_to_html(markdown(body, pipeline: :single_line), url, html_options)
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end
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def link_to_markdown_field(object, field, url, html_options = {})
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rendered_field = markdown_field(object, field)
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link_to_html(rendered_field, url, html_options)
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end
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# It solves a problem occurring with nested links (i.e.
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# "<a>outer text <a>gfm ref</a> more outer text</a>"). This will not be
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# interpreted as intended. Browsers will parse something like
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# "<a>outer text </a><a>gfm ref</a> more outer text" (notice the last part is
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# not linked any more). link_to_html corrects that. It wraps all parts to
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# explicitly produce the correct linking behavior (i.e.
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# "<a>outer text </a><a>gfm ref</a><a> more outer text</a>").
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def link_to_html(redacted, url, html_options = {})
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fragment = Nokogiri::HTML::DocumentFragment.parse(redacted)
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if fragment.children.size == 1 && fragment.children[0].name == 'a'
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# Fragment has only one node, and it's a link generated by `gfm`.
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# Replace it with our requested link.
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text = fragment.children[0].text
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fragment.children[0].replace(link_to(text, url, html_options))
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else
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# Traverse the fragment's first generation of children looking for pure
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# text, wrapping anything found in the requested link
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fragment.children.each do |node|
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next unless node.text?
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node.replace(link_to(node.text, url, html_options))
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end
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end
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# Add any custom CSS classes to the GFM-generated reference links
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if html_options[:class]
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fragment.css('a.gfm').add_class(html_options[:class])
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end
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fragment.to_html.html_safe
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end
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# Return the first line of +text+, up to +max_chars+, after parsing the line
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# as Markdown. HTML tags in the parsed output are not counted toward the
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# +max_chars+ limit. If the length limit falls within a tag's contents, then
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# the tag contents are truncated without removing the closing tag.
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def first_line_in_markdown(object, attribute, max_chars = nil, options = {})
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md = markdown_field(object, attribute, options)
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text = truncate_visible(md, max_chars || md.length) if md.present?
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sanitize(
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text,
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tags: %w(a img gl-emoji b pre code p span),
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attributes: Rails::Html::WhiteListSanitizer.allowed_attributes + ['style', 'data-src', 'data-name', 'data-unicode-version']
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)
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end
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def markdown(text, context = {})
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return '' unless text.present?
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context[:project] ||= @project
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context[:group] ||= @group
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html = markdown_unsafe(text, context)
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prepare_for_rendering(html, context)
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end
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def markdown_field(object, field, context = {})
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object = object.for_display if object.respond_to?(:for_display)
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redacted_field_html = object.try(:"redacted_#{field}_html")
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return '' unless object.present?
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return redacted_field_html if redacted_field_html
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html = Banzai.render_field(object, field, context)
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context.reverse_merge!(object.banzai_render_context(field)) if object.respond_to?(:banzai_render_context)
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prepare_for_rendering(html, context)
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end
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def markup(file_name, text, context = {})
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context[:project] ||= @project
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context[:markdown_engine] ||= :redcarpet
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html = context.delete(:rendered) || markup_unsafe(file_name, text, context)
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prepare_for_rendering(html, context)
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end
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def render_wiki_content(wiki_page)
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text = wiki_page.content
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return '' unless text.present?
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context = {
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pipeline: :wiki,
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project: @project,
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project_wiki: @project_wiki,
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page_slug: wiki_page.slug,
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issuable_state_filter_enabled: true,
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markdown_engine: :redcarpet
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}
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html =
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case wiki_page.format
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when :markdown
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markdown_unsafe(text, context)
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when :asciidoc
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asciidoc_unsafe(text)
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else
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wiki_page.formatted_content.html_safe
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end
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prepare_for_rendering(html, context)
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end
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def markup_unsafe(file_name, text, context = {})
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return '' unless text.present?
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if gitlab_markdown?(file_name)
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markdown_unsafe(text, context)
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elsif asciidoc?(file_name)
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asciidoc_unsafe(text, context)
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elsif plain?(file_name)
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content_tag :pre, class: 'plain-readme' do
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text
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end
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else
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other_markup_unsafe(file_name, text, context)
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end
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rescue RuntimeError
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simple_format(text)
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end
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# Returns the text necessary to reference `entity` across projects
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#
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# project - Project to reference
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# entity - Object that responds to `to_reference`
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#
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# Examples:
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#
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# cross_project_reference(project, project.issues.first)
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# # => 'namespace1/project1#123'
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#
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# cross_project_reference(project, project.merge_requests.first)
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# # => 'namespace1/project1!345'
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#
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# Returns a String
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def cross_project_reference(project, entity)
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if entity.respond_to?(:to_reference)
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entity.to_reference(project, full: true)
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else
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''
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end
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end
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private
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# Return +text+, truncated to +max_chars+ characters, excluding any HTML
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# tags.
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def truncate_visible(text, max_chars)
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doc = Nokogiri::HTML.fragment(text)
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content_length = 0
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truncated = false
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doc.traverse do |node|
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if node.text? || node.content.empty?
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if truncated
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node.remove
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next
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end
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# Handle line breaks within a node
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if node.content.strip.lines.length > 1
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node.content = "#{node.content.lines.first.chomp}..."
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truncated = true
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end
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num_remaining = max_chars - content_length
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if node.content.length > num_remaining
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node.content = node.content.truncate(num_remaining)
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truncated = true
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end
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content_length += node.content.length
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end
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truncated = truncate_if_block(node, truncated)
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end
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doc.to_html
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end
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# Used by #truncate_visible. If +node+ is the first block element, and the
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# text hasn't already been truncated, then append "..." to the node contents
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# and return true. Otherwise return false.
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def truncate_if_block(node, truncated)
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return true if truncated
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if node.element? && (node.description&.block? || node.matches?('pre > code > .line'))
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node.inner_html = "#{node.inner_html}..." if node.next_sibling
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true
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else
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truncated
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end
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end
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def markdown_toolbar_button(options = {})
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data = options[:data].merge({ container: 'body' })
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content_tag :button,
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type: 'button',
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class: 'toolbar-btn js-md has-tooltip',
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tabindex: -1,
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data: data,
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title: options[:title],
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aria: { label: options[:title] } do
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sprite_icon(options[:icon])
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end
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end
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def markdown_unsafe(text, context = {})
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Banzai.render(text, context)
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end
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def asciidoc_unsafe(text, context = {})
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Gitlab::Asciidoc.render(text, context)
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end
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def other_markup_unsafe(file_name, text, context = {})
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Gitlab::OtherMarkup.render(file_name, text, context)
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end
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def prepare_for_rendering(html, context = {})
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return '' unless html.present?
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context.merge!(
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current_user: (current_user if defined?(current_user)),
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# RelativeLinkFilter
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commit: @commit,
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project_wiki: @project_wiki,
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ref: @ref,
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requested_path: @path
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)
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html = Banzai.post_process(html, context)
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Hamlit::RailsHelpers.preserve(html)
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end
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extend self
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end
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