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# frozen_string_literal: true ## # Outputs RDoc markup as paragraphs with inline markup only. class RDoc::Markup::ToHtmlSnippet < RDoc::Markup::ToHtml ## # After this many characters the input will be cut off. attr_reader :character_limit ## # The number of characters seen so far. attr_reader :characters # :nodoc: ## # The attribute bitmask attr_reader :mask ## # After this many paragraphs the input will be cut off. attr_reader :paragraph_limit ## # Count of paragraphs found attr_reader :paragraphs ## # Creates a new ToHtmlSnippet formatter that will cut off the input on the # next word boundary after the given number of +characters+ or +paragraphs+ # of text have been encountered. def initialize options, characters = 100, paragraphs = 3, markup = nil super options, markup @character_limit = characters @paragraph_limit = paragraphs @characters = 0 @mask = 0 @paragraphs = 0 @markup.add_regexp_handling RDoc::CrossReference::CROSSREF_REGEXP, :CROSSREF end ## # Adds +heading+ to the output as a paragraph def accept_heading heading @res << "<p>#{to_html heading.text}\n" add_paragraph end ## # Raw sections are untrusted and ignored alias accept_raw ignore ## # Rules are ignored alias accept_rule ignore def accept_paragraph paragraph para = @in_list_entry.last \|\| "<p>" text = paragraph.text @hard_break @res << "#{para}#{to_html text}\n" add_paragraph end ## # Finishes consumption of +list_item+ def accept_list_item_end list_item end ## # Prepares the visitor for consuming +list_item+ def accept_list_item_start list_item @res << list_item_start(list_item, @list.last) end ## # Prepares the visitor for consuming +list+ def accept_list_start list @list << list.type @res << html_list_name(list.type, true) @in_list_entry.push '' end ## # Adds +verbatim+ to the output def accept_verbatim verbatim throw :done if @characters >= @character_limit input = verbatim.text.rstrip text = truncate input text << ' ...' unless text == input super RDoc::Markup::Verbatim.new text add_paragraph end ## # Prepares the visitor for HTML snippet generation def start_accepting super @characters = 0 end ## # Removes escaping from the cross-references in +target+ def handle_regexp_CROSSREF target target.text.sub(/\A\\/, '') end ## # +target+ is a <code><br></code> def handle_regexp_HARD_BREAK target @characters -= 4 '<br>' end ## # Lists are paragraphs, but notes and labels have a separator def list_item_start list_item, list_type throw :done if @characters >= @character_limit case list_type when :BULLET, :LALPHA, :NUMBER, :UALPHA then "<p>" when :LABEL, :NOTE then labels = Array(list_item.label).map do \|label\| to_html label end.join ', ' labels << " — " unless labels.empty? start = "<p>#{labels}" @characters += 1 # try to include the label start else raise RDoc::Error, "Invalid list type: #{list_type.inspect}" end end ## # Returns just the text of +link+, +url+ is only used to determine the link # type. def gen_url url, text if url =~ /^rdoc-label:([^:])(?::(.))?/ then type = "link" elsif url =~ /([A-Za-z]+):(.)/ then type = $1 else type = "http" end if (type == "http" or type == "https" or type == "link") and url =~ /\.(gif\|png\|jpg\|jpeg\|bmp)$/ then '' else text.sub(%r%^#{type}:/%, '') end end ## # In snippets, there are no lists def html_list_name list_type, open_tag '' end ## # Throws +:done+ when paragraph_limit paragraphs have been encountered def add_paragraph @paragraphs += 1 throw :done if @paragraphs >= @paragraph_limit end ## # Marks up +content+ def convert content catch :done do return super end end_accepting end ## # Converts flow items +flow+ def convert_flow flow throw :done if @characters >= @character_limit res = [] @mask = 0 flow.each do \|item\| case item when RDoc::Markup::AttrChanger then off_tags res, item on_tags res, item when String then text = convert_string item res << truncate(text) when RDoc::Markup::RegexpHandling then text = convert_regexp_handling item res << truncate(text) else raise "Unknown flow element: #{item.inspect}" end if @characters >= @character_limit then off_tags res, RDoc::Markup::AttrChanger.new(0, @mask) break end end res << ' ...' if @characters >= @character_limit res.join end ## # Maintains a bitmask to allow HTML elements to be closed properly. See # RDoc::Markup::Formatter. def on_tags res, item @mask ^= item.turn_on super end ## # Maintains a bitmask to allow HTML elements to be closed properly. See # RDoc::Markup::Formatter. def off_tags res, item @mask ^= item.turn_off super end ## # Truncates +text+ at the end of the first word after the character_limit. def truncate text length = text.length characters = @characters @characters += length return text if @characters < @character_limit remaining = @character_limit - characters text =~ /\A(.{#{remaining},}?)(\s\|$)/m # TODO word-break instead of \s? $1 end end