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to_html_snippet.rb

# 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 << "#{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 || ""

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> </code>

def handle_regexp_HARD_BREAK target
 @characters -= 4
 ' '
 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
 ""
 when :LABEL, :NOTE then
 labels = Array(list_item.label).map do |label|
 to_html label
 end.join ', '

labels << " &mdash; " unless labels.empty?

start = "#{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

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