Class: Peregrin::Zhook

Inherits:
Object
  • Object
show all
Defined in:
lib/formats/zhook.rb

Direct Known Subclasses

Ochook

Defined Under Namespace

Classes: ConvertUtilityMissing, FileNotFound, IndexHTMLRootHasId, MissingCoverPNG, MissingIndexHTML, NotAZipArchive, ValidationError, WrongExtension

Constant Summary collapse

FORMAT = 
"Zhook"
FILE_EXT = 
".zhook"
INDEX_PATH = 
"index.html"
COVER_PATH = 
"cover.png"
BODY_XPATH = 
'/html/body'
HEAD_XPATH = 
'/html/head'

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(book) ⇒ Zhook

Stitches together components of the internal book.



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# File 'lib/formats/zhook.rb', line 63

def initialize(book)
  @book = book

  if @book.components.length > 1
    stitch_components(@book)
  end

  consolidate_properties(@book)

  @book.chapters = outline_book(index)

  @book.cover ||= (
    @book.resources.detect { |r| r.src == COVER_PATH } ||
    @book.add_resource(COVER_PATH)
  )
end

Class Method Details

.read(path) ⇒ Object

Unzips the file at path, generates a simple book object, passes to new.



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# File 'lib/formats/zhook.rb', line 41

def self.read(path)
  validate(path)
  book = Peregrin::Book.new
  Zip::Archive.open(path) { |zf|
    book.add_component(INDEX_PATH, zf.content(INDEX_PATH))
    zf.each { |entry|
      ze = entry.name
      book.add_resource(ze)  unless ze == INDEX_PATH || entry.directory?
    }
  }
  book.read_resource_proc = lambda { |resource|
    Zip::Archive.open(path) { |zipfile| zipfile.content(resource.src) }
  }

  extract_properties_from_index(book)

  new(book)
end

.validate(path) ⇒ Object

Raises an exception if file at path is not a valid Zhook. Otherwise returns true.



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# File 'lib/formats/zhook.rb', line 14

def self.validate(path)
  raise FileNotFound.new(path)  unless File.file?(path)
  raise WrongExtension.new(path)  unless File.extname(path) == FILE_EXT
  begin
    zf = Zip::Archive.open(path)
  rescue
    raise NotAZipArchive.new(path)
  end

  unless zf.find(INDEX_PATH)
    raise MissingIndexHTML.new(path)
  end

  unless zf.find(COVER_PATH)
    raise MissingCoverPNG.new(path)
  end

  doc = Nokogiri::HTML::Document.parse(zf.content(INDEX_PATH), nil, 'UTF-8')
  raise IndexHTMLRootHasId.new(path)  if doc.root['id']

ensure
  zf.close  if zf
end

Instance Method Details

#to_book(options = {}) ⇒ Object

Returns the internal book object.



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# File 'lib/formats/zhook.rb', line 100

def to_book(options = {})
  bk = @book.deep_clone

  # XPath => URI mapping tools
  cmpt_xpaths = []

  boilerplate_rel_links =
    '<link rel="start" href="cover.html" />' +
    '<link rel="contents" href="toc.html" />'

  # Componentizing.
  if options[:componentize]
    componentizer = Peregrin::Componentizer.new(index)
    componentizer.process(index.root.at_css('body'))
    bk.components = componentizer.component_xpaths.collect { |xpath|
      cmpt_xpaths.push(xpath)
      doc = componentizer.generate_component(xpath)
      Peregrin::Component.new(uri_for_xpath(xpath, cmpt_xpaths), doc)
    }

    # Add rel links and convert to html string
    boilerplate_rel_links <<
      '<link rel="first" href="'+bk.components.first.src+'" />' +
      '<link rel="last" href="'+bk.components.last.src+'" />'
    bk.components.each_with_index { |cmpt, i|
      head = cmpt.contents.at_xpath(HEAD_XPATH)
      prev_path = bk.components[i-1].src  if (i-1) >= 0
      next_path = bk.components[i+1].src  if (i+1) < bk.components.size
      head.add_child(boilerplate_rel_links)
      head.add_child('<link rel="prev" href="'+prev_path+'" />')  if prev_path
      head.add_child('<link rel="next" href="'+next_path+'" />')  if next_path
      cmpt.contents = htmlize(cmpt.contents)
    }
  else
    cmpt_xpaths.push(BODY_XPATH)
    bk.components.clear
    bk.add_component(uri_for_xpath(BODY_XPATH), htmlize(index))
  end

  # Outlining.
  bk.chapters = outline_book(index, cmpt_xpaths)

  if options[:componentize]
    # Table of Contents
    doc = Nokogiri::HTML::Builder.new(:encoding => 'UTF-8') { |html|
      curse = lambda { |children|
        parts = children.collect { |chp|
          chp.empty_leaf? ? nil : [chp.title, chp.src, chp.children]
        }.compact

        html.ol {
          parts.each { |part|
            html.li {
              html.a(part[0], :href => part[1])
              curse.call(part[2])  if part[2].any?
            }
          }
        }  if parts.any?
      }
      curse.call(bk.chapters)
    }.doc
    if doc.root
      toc_doc = componentizer.generate_document(doc.root)
      toc_doc.at_xpath(HEAD_XPATH).add_child(boilerplate_rel_links)
      bk.add_component(
        "toc.html",
        htmlize(toc_doc),
        nil,
        :linear => "no",
        :guide => "Table of Contents",
        :guide_type => "toc"
      )
    end

    # List of Illustrations
    figures = index.css('figure[id], div.figure[id]')
    if figures.any?
      doc = Nokogiri::HTML::Builder.new(:encoding => 'UTF-8') { |html|
        html.ol {
          figures.each { |fig|
            next  unless caption = fig.at_css('figcaption, .figcaption')
            n = fig
            while n && n.respond_to?(:parent)
              break if cmpt_uri = uri_for_xpath(n.path, cmpt_xpaths)
              n = n.parent
            end
            next  unless cmpt_uri
            html.li {
              html.a(caption.content, :href => "#{cmpt_uri}##{fig['id']}")
            }
          }
        }
      }.doc
      loi_doc = componentizer.generate_document(doc.root)
      loi_doc.at_xpath(HEAD_XPATH).add_child(boilerplate_rel_links)
      bk.add_component(
        "loi.html",
        htmlize(loi_doc),
        nil,
        :linear => "no",
        :guide => "List of Illustrations",
        :guide_type => "loi"
      )
    end

    # Cover
    doc = Nokogiri::HTML::Builder.new(:encoding => 'UTF-8') { |html|
      html.div(:id => "cover") {
        html.img(:src => bk.cover.src, :alt => bk.property_for("title"))
      }
    }.doc
    cover_doc = componentizer.generate_document(doc.root)
    cover_doc.at_xpath(HEAD_XPATH).add_child(boilerplate_rel_links)
    bk.components.unshift(
      Peregrin::Component.new(
        "cover.html",
        htmlize(cover_doc),
        nil,
        :linear => "no",
        :guide => "Cover",
        :guide_type => "cover"
      )
    )
  end

  bk
end

#write(path) ⇒ Object

Writes the internal book object to a .zhook file at the given path.



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# File 'lib/formats/zhook.rb', line 83

def write(path)
  File.unlink(path)  if File.exists?(path)
  Zip::Archive.open(path, Zip::CREATE) { |zipfile|
    zipfile.add_buffer(INDEX_PATH, htmlize(index))
    @book.resources.each { |resource|
      zipfile.add_buffer(resource.src, @book.read_resource(resource))
    }
    unless @book.cover.src == COVER_PATH
      zipfile.add_buffer(COVER_PATH, to_png_data(@book.cover))
    end
  }
  path
end