# class RDoc::Markup::ToHtmlSnippet

frozen_string_literal: false

Outputs RDoc markup as paragraphs with inline markup only.

### Attributes

character_limit[R]

After this many characters the input will be cut off.

mask[R]

The attribute bitmask

paragraph_limit[R]

After this many paragraphs the input will be cut off.

paragraphs[R]

Count of paragraphs found

### Public Class Methods

new(options, characters = 100, paragraphs = 3, markup = nil) click to toggle source

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.

Calls superclass method RDoc::Markup::ToHtml.new

    # File lib/rdoc/markup/to_html_snippet.rb, line 37
    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_special RDoc::CrossReference::CROSSREF_REGEXP, :CROSSREF
    end

### Public Instance Methods

accept_heading(heading) click to toggle source

Adds `heading` to the output as a paragraph

    # File lib/rdoc/markup/to_html_snippet.rb, line 53
    def accept_heading heading
      @res << "<p>#{to_html heading.text}\n"

      add_paragraph
    end

accept_list_item_end(list_item) click to toggle source

Finishes consumption of `list_item`

    # File lib/rdoc/markup/to_html_snippet.rb, line 82
    def accept_list_item_end list_item
    end

accept_list_item_start(list_item) click to toggle source

Prepares the visitor for consuming `list_item`

    # File lib/rdoc/markup/to_html_snippet.rb, line 88
    def accept_list_item_start list_item
      @res << list_item_start(list_item, @list.last)
    end

accept_list_start(list) click to toggle source

Prepares the visitor for consuming `list`

    # File lib/rdoc/markup/to_html_snippet.rb, line 95
    def accept_list_start list
      @list << list.type
      @res << html_list_name(list.type, true)
      @in_list_entry.push ''
    end

accept_paragraph(paragraph) click to toggle source

    # File lib/rdoc/markup/to_html_snippet.rb, line 69
    def accept_paragraph paragraph
      para = @in_list_entry.last || "<p>"

      text = paragraph.text @hard_break

      @res << "#{para}#{wrap to_html text}\n"

      add_paragraph
    end

accept_verbatim(verbatim) click to toggle source

Adds `verbatim` to the output

Calls superclass method RDoc::Markup::ToHtml#accept_verbatim

    # File lib/rdoc/markup/to_html_snippet.rb, line 104
    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

add_paragraph() click to toggle source

Throws `:done` when #paragraph_limit paragraphs have been encountered

    # File lib/rdoc/markup/to_html_snippet.rb, line 195
    def add_paragraph
      @paragraphs += 1

      throw :done if @paragraphs >= @paragraph_limit
    end

convert(content) click to toggle source

Marks up `content`

Calls superclass method RDoc::Markup::Formatter#convert

    # File lib/rdoc/markup/to_html_snippet.rb, line 204
    def convert content
      catch :done do
        return super
      end

      end_accepting
    end

convert_flow(flow) click to toggle source

Converts flow items `flow`

    # File lib/rdoc/markup/to_html_snippet.rb, line 215
    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::Special then
          text = convert_special 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

gen_url(url, text) click to toggle source

Returns just the text of `link`, `url` is only used to determine the link type.

    # File lib/rdoc/markup/to_html_snippet.rb, line 168
    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

handle_special_CROSSREF(special) click to toggle source

Removes escaping from the cross-references in `special`

    # File lib/rdoc/markup/to_html_snippet.rb, line 128
    def handle_special_CROSSREF special
      special.text.sub(/\A\/, '')
    end

handle_special_HARD_BREAK(special) click to toggle source

`special` is a `
`

    # File lib/rdoc/markup/to_html_snippet.rb, line 135
    def handle_special_HARD_BREAK special
      @characters -= 4
      '<br>'
    end

html_list_name(list_type, open_tag) click to toggle source

In snippets, there are no lists

    # File lib/rdoc/markup/to_html_snippet.rb, line 188
    def html_list_name list_type, open_tag
      ''
    end

list_item_start(list_item, list_type) click to toggle source

Lists are paragraphs, but notes and labels have a separator

    # File lib/rdoc/markup/to_html_snippet.rb, line 143
    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 << " &mdash; " 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

off_tags(res, item) click to toggle source

Maintains a bitmask to allow HTML elements to be closed properly. See RDoc::Markup::Formatter.

Calls superclass method RDoc::Markup::Formatter#off_tags

    # File lib/rdoc/markup/to_html_snippet.rb, line 261
    def off_tags res, item
      @mask ^= item.turn_off

      super
    end

on_tags(res, item) click to toggle source

Maintains a bitmask to allow HTML elements to be closed properly. See RDoc::Markup::Formatter.

Calls superclass method RDoc::Markup::Formatter#on_tags

    # File lib/rdoc/markup/to_html_snippet.rb, line 251
    def on_tags res, item
      @mask ^= item.turn_on

      super
    end

start_accepting() click to toggle source

Prepares the visitor for HTML snippet generation

Calls superclass method RDoc::Markup::ToHtml#start_accepting

    # File lib/rdoc/markup/to_html_snippet.rb, line 119
    def start_accepting
      super

      @characters = 0
    end

truncate(text) click to toggle source

Truncates `text` at the end of the first word after the character_limit.

    # File lib/rdoc/markup/to_html_snippet.rb, line 270
    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