Class: RDoc::Markup::ToHtmlSnippet

Inherits:
ToHtml show all
Defined in:
lib/rdoc/markup/to_html_snippet.rb

Overview

Outputs RDoc markup as paragraphs with inline markup only.

Constant Summary

Constants inherited from ToHtml

RDoc::Markup::ToHtml::LIST_TYPE_TO_HTML, RDoc::Markup::ToHtml::URL_CHARACTERS_REGEXP_STR

Constants included from Text

Text::MARKUP_FORMAT, Text::SPACE_SEPARATED_LETTER_CLASS, Text::TO_HTML_CHARACTERS

Instance Attribute Summary collapse

Attributes inherited from ToHtml

#code_object, #from_path, #in_list_entry, #list, #res

Attributes included from Text

#language

Instance Method Summary collapse

Methods inherited from ToHtml

#accept_blank_line, #accept_block_quote, #accept_list_end, #accept_table, #convert_string, #end_accepting, #handle_RDOCLINK, #handle_regexp_HYPERLINK, #handle_regexp_RDOCLINK, #handle_regexp_TIDYLINK, #init_link_notation_regexp_handlings, #init_regexp_handlings, #init_tags, #list_end_for, #parseable?, #to_html

Methods included from Text

encode_fallback, #expand_tabs, #flush_left, #markup, #normalize_comment, #parse, #snippet, #strip_hashes, #strip_newlines, #strip_stars, #to_html, #wrap

Methods inherited from Formatter

#accept_document, #add_regexp_handling_RDOCLINK, #add_regexp_handling_TIDYLINK, #add_tag, #annotate, #convert_regexp_handling, #convert_string, #each_attr_tag, gen_relative_url, #ignore, #in_tt?, #parse_url, #tt?, #tt_tag?

Constructor Details

#initialize(options, characters = 100, paragraphs = 3, markup = nil) ⇒ ToHtmlSnippet

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.



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# 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_regexp_handling RDoc::CrossReference::CROSSREF_REGEXP, :CROSSREF
end

Instance Attribute Details

#character_limit ⇒ Object (readonly)

After this many characters the input will be cut off.



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# File 'lib/rdoc/markup/to_html_snippet.rb', line 10

def character_limit
  @character_limit
end

#characters ⇒ Object (readonly)

The number of characters seen so far.



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# File 'lib/rdoc/markup/to_html_snippet.rb', line 15

def characters
  @characters
end

#mask ⇒ Object (readonly)

The attribute bitmask



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# File 'lib/rdoc/markup/to_html_snippet.rb', line 20

def mask
  @mask
end

#paragraph_limit ⇒ Object (readonly)

After this many paragraphs the input will be cut off.



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# File 'lib/rdoc/markup/to_html_snippet.rb', line 25

def paragraph_limit
  @paragraph_limit
end

#paragraphs ⇒ Object (readonly)

Count of paragraphs found



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# File 'lib/rdoc/markup/to_html_snippet.rb', line 30

def paragraphs
  @paragraphs
end

Instance Method Details

#accept_heading(heading) ⇒ Object

Adds heading to the output as a paragraph



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# 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) ⇒ Object

Finishes consumption of list_item



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# File 'lib/rdoc/markup/to_html_snippet.rb', line 85

def accept_list_item_end list_item
end

#accept_list_item_start(list_item) ⇒ Object

Prepares the visitor for consuming list_item



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# File 'lib/rdoc/markup/to_html_snippet.rb', line 91

def accept_list_item_start list_item
  @res << list_item_start(list_item, @list.last)
end

#accept_list_start(list) ⇒ Object

Prepares the visitor for consuming list



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# File 'lib/rdoc/markup/to_html_snippet.rb', line 98

def accept_list_start list
  @list << list.type
  @res << html_list_name(list.type, true)
  @in_list_entry.push ''
end

#accept_paragraph(paragraph) ⇒ Object

Adds paragraph to the output



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# File 'lib/rdoc/markup/to_html_snippet.rb', line 72

def accept_paragraph paragraph
  para = @in_list_entry.last || "<p>"

  text = paragraph.text @hard_break

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

  add_paragraph
end

#accept_verbatim(verbatim) ⇒ Object

Adds verbatim to the output



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# File 'lib/rdoc/markup/to_html_snippet.rb', line 107

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 ⇒ Object

Throws :done when paragraph_limit paragraphs have been encountered



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# File 'lib/rdoc/markup/to_html_snippet.rb', line 198

def add_paragraph
  @paragraphs += 1

  throw :done if @paragraphs >= @paragraph_limit
end

#convert(content) ⇒ Object

Marks up content



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# File 'lib/rdoc/markup/to_html_snippet.rb', line 207

def convert content
  catch :done do
    return super
  end

  end_accepting
end

#convert_flow(flow) ⇒ Object

Converts flow items flow



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# File 'lib/rdoc/markup/to_html_snippet.rb', line 218

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

#gen_url(url, text) ⇒ Object

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



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# File 'lib/rdoc/markup/to_html_snippet.rb', line 171

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_regexp_CROSSREF(target) ⇒ Object

Removes escaping from the cross-references in target



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# File 'lib/rdoc/markup/to_html_snippet.rb', line 131

def handle_regexp_CROSSREF target
  target.text.sub(/\A\\/, '')
end

#handle_regexp_HARD_BREAK(target) ⇒ Object

target is a <br>



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# File 'lib/rdoc/markup/to_html_snippet.rb', line 138

def handle_regexp_HARD_BREAK target
  @characters -= 4
  '<br>'
end

#html_list_name(list_type, open_tag) ⇒ Object

In snippets, there are no lists



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# File 'lib/rdoc/markup/to_html_snippet.rb', line 191

def html_list_name list_type, open_tag
  ''
end

#list_item_start(list_item, list_type) ⇒ Object

Lists are paragraphs, but notes and labels have a separator



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# File 'lib/rdoc/markup/to_html_snippet.rb', line 146

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) ⇒ Object

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



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# File 'lib/rdoc/markup/to_html_snippet.rb', line 264

def off_tags res, item
  @mask ^= item.turn_off

  super
end

#on_tags(res, item) ⇒ Object

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



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# File 'lib/rdoc/markup/to_html_snippet.rb', line 254

def on_tags res, item
  @mask ^= item.turn_on

  super
end

#start_accepting ⇒ Object

Prepares the visitor for HTML snippet generation



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# File 'lib/rdoc/markup/to_html_snippet.rb', line 122

def start_accepting
  super

  @characters = 0
end

#truncate(text) ⇒ Object

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



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# File 'lib/rdoc/markup/to_html_snippet.rb', line 273

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