Class: Rocco

Inherits:
Object
  • Object
show all
Includes:
CommentStyles
Defined in:
lib/rocco.rb,
lib/rocco/tasks.rb,
lib/rocco/comment_styles.rb

Overview

Reopen the Rocco class and add a make class method. This is a simple bit of sugar over Rocco::Task.new. If you want your Rake task to be named something other than :rocco, you can use Rocco::Task directly.

Defined Under Namespace

Modules: CommentStyles Classes: Layout, Task

Constant Summary collapse

VERSION = 
'0.8.2'

Constants included from CommentStyles

CommentStyles::COMMENT_STYLES, CommentStyles::C_STYLE_COMMENTS

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(filename, sources = [], options = {}, &block) ⇒ Rocco

Returns a new instance of Rocco.



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# File 'lib/rocco.rb', line 77

def initialize(filename, sources=[], options={}, &block)
  @file       = filename
  @sources    = sources

  # When `block` is given, it must read the contents of the file using
  # whatever means necessary and return it as a string. With no `block`,
  # the file is read to retrieve data.
  @data =
    if block_given?
      yield
    else
      File.read(filename)
    end

  defaults = {
    :language      => 'ruby',
    :comment_chars => '#',
    :template_file => nil
  }
  @options = defaults.merge(options)

  # If we detect a language
  if detect_language() != "text"
    # then assign the detected language to `:language`, and look for
    # comment characters based on that language
    @options[:language] = detect_language()
    @options[:comment_chars] = generate_comment_chars()

  # If we didn't detect a language, but the user provided one, use it
  # to look around for comment characters to override the default.
  elsif @options[:language] != defaults[:language]
    @options[:comment_chars] = generate_comment_chars()

  # If neither is true, then convert the default comment character string
  # into the comment_char syntax (we'll discuss that syntax in detail when
  # we get to `generate_comment_chars()` in a moment.
  else
    @options[:comment_chars] = {
      :single => @options[:comment_chars],
      :multi => nil
    }
  end

  # Turn `:comment_chars` into a regex matching a series of spaces, the
  # `:comment_chars` string, and the an optional space.  We'll use that
  # to detect single-line comments.
  @comment_pattern =
    Regexp.new("^\\s*#{@options[:comment_chars][:single]}\s?")

  # `parse()` the file contents stored in `@data`.  Run the result through
  # `split()` and that result through `highlight()` to generate the final
  # section list.
  @sections = highlight(split(parse(@data)))
end

Instance Attribute Details

#file ⇒ Object (readonly)

The filename as given to Rocco.new.



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# File 'lib/rocco.rb', line 133

def file
  @file
end

#options ⇒ Object (readonly)

The merged options array



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# File 'lib/rocco.rb', line 136

def options
  @options
end

#sections ⇒ Object (readonly)

A list of two-tuples representing each section of the source file. Each item in the list has the form: [docs_html, code_html], where both elements are strings containing the documentation and source code HTML, respectively.



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# File 'lib/rocco.rb', line 142

def sections
  @sections
end

#sources ⇒ Object (readonly)

A list of all source filenames included in the documentation set. Useful for building an index of other files.



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# File 'lib/rocco.rb', line 146

def sources
  @sources
end

Class Method Details

.make(dest = 'docs/', source_files = 'lib/**/*.rb', options = {}) ⇒ Object 



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# File 'lib/rocco/tasks.rb', line 54

def self.make(dest='docs/', source_files='lib/**/*.rb', options={})
  Task.new(:rocco, dest, source_files, options)
end

Instance Method Details

#detect_language ⇒ Object

If pygmentize is available, we can use it to autodetect a file's language based on its filename. Filenames without extensions, or with extensions that pygmentize doesn't understand will return text. We'll also return text if pygmentize isn't available.

We'll memoize the result, as we'll call this a few times.



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# File 'lib/rocco.rb', line 169

def detect_language
  @_language ||=
    if pygmentize?
      %x[pygmentize -N #{@file}].strip.split('+').first
    else
      "text"
    end
end

#docblock(docs) ⇒ Object

Take a list of block comments and convert Docblock @annotations to Markdown syntax.



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# File 'lib/rocco.rb', line 369

def docblock(docs)
  docs.map do |doc|
    doc.split("\n").map do |line|
      line.match(/^@\w+/) ? line.sub(/^@(\w+)\s+/, '> **\1** ')+"  " : line
    end.join("\n")
  end
end

#generate_comment_chars ⇒ Object 



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# File 'lib/rocco.rb', line 212

def generate_comment_chars
  @_commentchar ||=
    if COMMENT_STYLES[@options[:language]]
      COMMENT_STYLES[@options[:language]]
    else
      { :single => @options[:comment_chars], :multi => nil, :heredoc => nil }
    end
end

#highlight(blocks) ⇒ Object

Take the result of split and apply Markdown formatting to comments and syntax highlighting to source code.



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# File 'lib/rocco.rb', line 379

def highlight(blocks)
  docs_blocks, code_blocks = blocks

  # Pre-process Docblock @annotations.
  if @options[:docblocks]
    docs_blocks = docblock(docs_blocks)
  end

  # Combine all docs blocks into a single big markdown document with section
  # dividers and run through the Markdown processor. Then split it back out
  # into separate sections.
  markdown = docs_blocks.join("\n\n##### DIVIDER\n\n")
  docs_html = process_markdown(markdown).
    split(/\n*<h5>DIVIDER<\/h5>\n*/m)

  # Combine all code blocks into a single big stream with section dividers and
  # run through either `pygmentize(1)` or <http://pygments.appspot.com>
  span, espan = '<span class="c.?">', '</span>'
  if @options[:comment_chars][:single]
    front = @options[:comment_chars][:single]
    divider_input  = "\n\n#{front} DIVIDER\n\n"
    divider_output = Regexp.new(
      [ "\\n*",
        span,
        Regexp.escape(CGI.escapeHTML(front)),
        ' DIVIDER',
        espan,
        "\\n*"
      ].join, Regexp::MULTILINE
    )
  else
    front = @options[:comment_chars][:multi][:start]
    back  = @options[:comment_chars][:multi][:end]
    divider_input  = "\n\n#{front}\nDIVIDER\n#{back}\n\n"
    divider_output = Regexp.new(
      [ "\\n*",
        span, Regexp.escape(CGI.escapeHTML(front)), espan,
        "\\n",
        span, "DIVIDER", espan,
        "\\n",
        span, Regexp.escape(CGI.escapeHTML(back)), espan,
        "\\n*"
      ].join, Regexp::MULTILINE
    )
  end

  code_stream = code_blocks.join(divider_input)

  code_html =
    if pygmentize?
      highlight_pygmentize(code_stream)
    else
      highlight_webservice(code_stream)
    end

  # Do some post-processing on the pygments output to split things back
  # into sections and remove partial `<pre>` blocks.
  code_html = code_html.
    split(divider_output).
    map { |code| code.sub(/\n?<div class="highlight"><pre>/m, '') }.
    map { |code| code.sub(/\n?<\/pre><\/div>\n/m, '') }

  # Lastly, combine the docs and code lists back into a list of two-tuples.
  docs_html.zip(code_html)
end

#highlight_pygmentize(code) ⇒ Object

We popen a read/write pygmentize process in the parent and then fork off a child process to write the input.



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# File 'lib/rocco.rb', line 452

def highlight_pygmentize(code)
  code_html = nil
  open("|pygmentize -l #{@options[:language]} -O encoding=utf-8 -f html", 'r+') do |fd|
    pid =
      fork {
        fd.close_read
        fd.write code
        fd.close_write
        exit!
      }
    fd.close_write
    code_html = fd.read
    fd.close_read
    Process.wait(pid)
  end

  code_html
end

#highlight_webservice(code) ⇒ Object

Pygments is not one of those things that's trivial for a ruby user to install, so we'll fall back on a webservice to highlight the code if it isn't available.



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# File 'lib/rocco.rb', line 473

def highlight_webservice(code)
  Net::HTTP.post_form(
    URI.parse('http://pygments.appspot.com/'),
    {'lang' => @options[:language], 'code' => code}
  ).body
end

#normalize_leading_spaces(sections) ⇒ Object

Normalizes documentation whitespace by checking for leading whitespace, removing it, and then removing the same amount of whitespace from each succeeding line. That is:

def func():
  """
    Comment 1
    Comment 2
  """
  print "omg!"

should yield a comment block of Comment 1\nComment 2 and code of def func():\n print "omg!"



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# File 'lib/rocco.rb', line 339

def normalize_leading_spaces(sections)
  sections.map do |section|
    if section.any? && section[0].any?
      leading_space = section[0][0].match("^\s+")
      if leading_space
        section[0] =
          section[0].map{ |line| line.sub(/^#{leading_space.to_s}/, '') }
      end
    end
    section
  end
end

#parse(data) ⇒ Object

Parse the raw file data into a list of two-tuples. Each tuple has the form [docs, code] where both elements are arrays containing the raw lines parsed from the input file, comment characters stripped.



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# File 'lib/rocco.rb', line 227

def parse(data)
  sections = []
  docs, code = [], []
  lines = data.split("\n")

  # The first line is ignored if it is a shebang line.  We also ignore the
  # PEP 263 encoding information in python sourcefiles, and the similar ruby
  # 1.9 syntax.
  lines.shift if lines[0] =~ /^\#\!/
  lines.shift if lines[0] =~ /coding[:=]\s*[-\w.]+/ &&
                 [ "python", "rb" ].include?(@options[:language])

  # To detect both block comments and single-line comments, we'll set
  # up a tiny state machine, and loop through each line of the file.
  # This requires an `in_comment_block` boolean, and a few regular
  # expressions for line tests.  We'll do the same for fake heredoc parsing.
  in_comment_block = false
  in_heredoc = false
  single_line_comment, block_comment_start, block_comment_mid, block_comment_end =
    nil, nil, nil, nil
  if not @options[:comment_chars][:single].nil?
    single_line_comment = Regexp.new("^\\s*#{Regexp.escape(@options[:comment_chars][:single])}\\s?")
  end
  if not @options[:comment_chars][:multi].nil?
    block_comment_start = Regexp.new("^\\s*#{Regexp.escape(@options[:comment_chars][:multi][:start])}\\s*$")
    block_comment_end   = Regexp.new("^\\s*#{Regexp.escape(@options[:comment_chars][:multi][:end])}\\s*$")
    block_comment_one_liner = Regexp.new("^\\s*#{Regexp.escape(@options[:comment_chars][:multi][:start])}\\s*(.*?)\\s*#{Regexp.escape(@options[:comment_chars][:multi][:end])}\\s*$")
    block_comment_start_with = Regexp.new("^\\s*#{Regexp.escape(@options[:comment_chars][:multi][:start])}\\s*(.*?)$")
    block_comment_end_with = Regexp.new("\\s*(.*?)\\s*#{Regexp.escape(@options[:comment_chars][:multi][:end])}\\s*$")
    if @options[:comment_chars][:multi][:middle]
      block_comment_mid = Regexp.new("^\\s*#{Regexp.escape(@options[:comment_chars][:multi][:middle])}\\s?")
    end
  end
  if not @options[:comment_chars][:heredoc].nil?
    heredoc_start = Regexp.new("#{Regexp.escape(@options[:comment_chars][:heredoc])}(\\S+)$")
  end
  lines.each do |line|
    # If we're currently in a comment block, check whether the line matches
    # the _end_ of a comment block or the _end_ of a comment block with a
    # comment.
    if in_comment_block
      if block_comment_end && line.match(block_comment_end)
        in_comment_block = false
      elsif block_comment_end_with && line.match(block_comment_end_with)
        in_comment_block = false
        docs << line.match(block_comment_end_with).captures.first.
                      sub(block_comment_mid || '', '')
      else
        docs << line.sub(block_comment_mid || '', '')
      end
    # If we're currently in a heredoc, we're looking for the end of the
    # heredoc, and everything it contains is code.
    elsif in_heredoc
      if line.match(Regexp.new("^#{Regexp.escape(in_heredoc)}$"))
        in_heredoc = false
      end
      code << line
    # Otherwise, check whether the line starts a heredoc. If so, note the end
    # pattern, and the line is code.  Otherwise check whether the line matches
    # the beginning of a block, or a single-line comment all on it's lonesome.
    # In either case, if there's code, start a new section.
    else
      if heredoc_start && line.match(heredoc_start)
        in_heredoc = $1
        code << line
      elsif block_comment_one_liner && line.match(block_comment_one_liner)
        if code.any?
          sections << [docs, code]
          docs, code = [], []
        end
        docs << line.match(block_comment_one_liner).captures.first
      elsif block_comment_start && line.match(block_comment_start)
        in_comment_block = true
        if code.any?
          sections << [docs, code]
          docs, code = [], []
        end
      elsif block_comment_start_with && line.match(block_comment_start_with)
        in_comment_block = true
        if code.any?
          sections << [docs, code]
          docs, code = [], []
        end
        docs << line.match(block_comment_start_with).captures.first
      elsif single_line_comment && line.match(single_line_comment)
        if code.any?
          sections << [docs, code]
          docs, code = [], []
        end
        docs << line.sub(single_line_comment || '', '')
      else
        code << line
      end
    end
  end
  sections << [docs, code] if docs.any? || code.any?
  normalize_leading_spaces(sections)
end

#process_markdown(text) ⇒ Object

Convert Markdown to classy HTML.



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# File 'lib/rocco.rb', line 446

def process_markdown(text)
  Markdown.new(text, :smart).to_html
end

#pygmentize? ⇒ Boolean

Returns true if pygmentize is available locally, false otherwise.

Returns:

  • (Boolean) 


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# File 'lib/rocco.rb', line 158

def pygmentize?
  @_pygmentize ||= ENV['PATH'].split(':').
    any? { |dir| File.executable?("#{dir}/pygmentize") }
end

#split(sections) ⇒ Object

Take the list of paired sections two-tuples and split into two separate lists: one holding the comments with leaders removed and one with the code blocks.



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# File 'lib/rocco.rb', line 355

def split(sections)
  docs_blocks, code_blocks = [], []
  sections.each do |docs,code|
    docs_blocks << docs.join("\n")
    code_blocks << code.map do |line|
      tabs = line.match(/^(\t+)/)
      tabs ? line.sub(/^\t+/, '  ' * tabs.captures[0].length) : line
    end.join("\n")
  end
  [docs_blocks, code_blocks]
end

#to_html ⇒ Object 



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# File 'lib/rocco.rb', line 150

def to_html
  Rocco::Layout.new(self, @options[:template_file]).render
end