335 lines
12 KiB
Ruby
335 lines
12 KiB
Ruby
# **Rocco** is a Ruby port of [Docco][do], the quick-and-dirty,
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# hundred-line-long, literate-programming-style documentation generator.
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#
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# Rocco reads Ruby source files and produces annotated source documentation
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# in HTML format. Comments are formatted with [Markdown][md] and presented
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# alongside syntax highlighted code so as to give an annotation effect.
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# This page is the result of running Rocco against [its own source file][so].
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#
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# Most of this was written while waiting for [node.js][no] to build (so I
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# could use Docco!). Docco's gorgeous HTML and CSS are taken verbatim.
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# The main difference is that Rocco is written in Ruby instead of
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# [CoffeeScript][co] and may be a bit easier to obtain and install in
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# existing Ruby environments or where node doesn't run yet.
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#
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# Install Rocco with Rubygems:
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#
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# gem install rocco
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#
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# Once installed, the `rocco` command can be used to generate documentation
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# for a set of Ruby source files:
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#
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# rocco lib/*.rb
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#
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# The HTML files are written to the current working directory.
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#
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# [no]: http://nodejs.org/
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# [do]: http://jashkenas.github.com/docco/
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# [co]: http://coffeescript.org/
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# [md]: http://daringfireball.net/projects/markdown/
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# [so]: http://github.com/rtomayko/rocco/blob/master/lib/rocco.rb#commit
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#### Prerequisites
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# We'll need a Markdown library. [RDiscount][rd], if we're lucky. Otherwise,
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# issue a warning and fall back on using BlueCloth.
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#
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# [rd]: http://github.com/rtomayko/rdiscount
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begin
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require 'rdiscount'
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rescue LoadError => boom
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warn "WARNING: #{boom}. Trying bluecloth."
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require 'bluecloth'
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Markdown = BlueCloth
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end
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# We use [{{ mustache }}](http://defunkt.github.com/mustache/) for
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# HTML templating.
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require 'mustache'
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# We use `Net::HTTP` to highlight code via <http://pygments.appspot.com>
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require 'net/http'
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# Code is run through [Pygments](http://pygments.org/) for syntax
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# highlighting. If it's not installed, locally, use a webservice.
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include FileTest
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if !ENV['PATH'].split(':').any? { |dir| executable?("#{dir}/pygmentize") }
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warn "WARNING: Pygments not found. Using webservice."
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end
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#### Public Interface
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# `Rocco.new` takes a source `filename`, an optional list of source filenames
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# for other documentation sources, an `options` hash, and an optional `block`.
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# The `options` hash respects three members:
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#
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# * `:language`: specifies which Pygments lexer to use if one can't be
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# auto-detected from the filename. _Defaults to `ruby`_.
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#
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# * `:comment_chars`, which specifies the comment characters of the
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# target language. _Defaults to `#`_.
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#
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# * `:template_file`, which specifies a external template file to use
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# when rendering the final, highlighted file via Mustache. _Defaults
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# to `nil` (that is, Mustache will use `./lib/rocco/layout.mustache`)_.
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#
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class Rocco
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VERSION = '0.5'
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def initialize(filename, sources=[], options={}, &block)
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@file = filename
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@sources = sources
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# When `block` is given, it must read the contents of the file using
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# whatever means necessary and return it as a string. With no `block`,
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# the file is read to retrieve data.
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@data =
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if block_given?
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yield
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else
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File.read(filename)
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end
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defaults = {
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:language => 'ruby',
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:comment_chars => '#',
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:template_file => nil
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}
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@options = defaults.merge(options)
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# If we detect a language
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if detect_language() != "text"
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# then assign the detected language to `:language`, and look for
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# comment characters based on that language
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@options[:language] = detect_language()
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@options[:comment_chars] = generate_comment_chars()
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# If we didn't detect a language, but the user provided one, use it
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# to look around for comment characters to override the default.
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elsif @options[:language] != defaults[:language]
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@options[:comment_chars] = generate_comment_chars()
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end
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# Turn `:comment_chars` into a regex matching a series of spaces, the
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# `:comment_chars` string, and the an optional space. We'll use that
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# to detect single-line comments.
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@comment_pattern = Regexp.new("^\\s*#{@options[:comment_chars]}\s?")
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# `parse()` the file contents stored in `@data`. Run the result through `split()`
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# and that result through `highlight()` to generate the final section list.
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@sections = highlight(split(parse(@data)))
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end
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# The filename as given to `Rocco.new`.
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attr_reader :file
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# The merged options array
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attr_reader :options
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# A list of two-tuples representing each *section* of the source file. Each
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# item in the list has the form: `[docs_html, code_html]`, where both
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# elements are strings containing the documentation and source code HTML,
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# respectively.
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attr_reader :sections
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# A list of all source filenames included in the documentation set. Useful
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# for building an index of other files.
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attr_reader :sources
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# Generate HTML output for the entire document.
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require 'rocco/layout'
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def to_html
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Rocco::Layout.new(self, @options[:template_file]).render
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end
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# Helper Functions
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# ----------------
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# Returns `true` if `pygmentize` is available locally, `false` otherwise.
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def pygmentize?
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# Memoize the result
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if @_pygmentize.nil?
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@_pygmentize = ENV['PATH'].split(':').any? { |dir| executable?("#{dir}/pygmentize") }
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end
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@_pygmentize
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end
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# If `pygmentize` is available, we can use it to autodetect a file's
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# language based on its filename. Filenames without extensions, or with
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# extensions that `pygmentize` doesn't understand will return `text`.
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# We'll also return `text` if `pygmentize` isn't available.
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#
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# We'll memoize the result, as we'll call this a few times.
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def detect_language
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@_language ||= begin
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if pygmentize?
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lang = %x[pygmentize -N #{@file}].strip!
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else
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"text"
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end
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end
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end
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# Given a file's language, we should be able to autopopulate the
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# `comment_chars` variables for single-line comments. If we don't
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# have comment characters on record for a given language, we'll
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# use the user-provided `:comment_char` option (which defaults to
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# `#`).
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#
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# Comment characters are listed as:
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#
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# { :single => "//", :multi_start => "/**", :multi_middle => "*", :multi_end => "*/" }
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#
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# `:single` denotes the leading character of a single-line comment.
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# `:multi_start` denotes the string that should appear alone on a
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# line of code to begin a block of documentation. `:multi_middle`
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# denotes the leading character of block comment content, and
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# `:multi_end` is the string that ought appear alone on a line to
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# close a block of documentation. That is:
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#
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# /** [:multi][:start]
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# * [:multi][:middle]
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# ...
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# * [:multi][:middle]
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# */ [:multi][:end]
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#
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# If a language only has one type of comment, the missing type
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# should be assigned `nil`.
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#
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# At the moment, we're only returning `:single`. Consider this
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# groundwork for block comment parsing.
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def generate_comment_chars
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@_commentchar ||= begin
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language = @options[:language]
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comment_styles = {
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"bash" => { :single => "#", :multi => nil },
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"c" => { :single => "//", :multi => { :start => "/**", :middle => "*", :end => "*/" } },
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"coffee-script" => { :single => "#", :multi => { :start => "###", :middle => nil, :end => "###" } },
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"cpp" => { :single => "//", :multi => { :start => "/**", :middle => "*", :end => "*/" } },
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"java" => { :single => "//", :multi => { :start => "/**", :middle => "*", :end => "*/" } },
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"js" => { :single => "//", :multi => { :start => "/**", :middle => "*", :end => "*/" } },
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"lua" => { :single => "--", :multi => nil },
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"python" => { :single => "#", :multi => { :start => '"""', :middle => nil, :end => '"""' } },
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"rb" => { :single => "#", :multi => { :start => '=begin', :middle => nil, :end => '=end' } },
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"scheme" => { :single => ";;", :multi => nil },
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}
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if comment_styles[language]
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comment_styles[language][:single]
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else
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@options[:comment_chars]
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end
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end
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end
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# Internal Parsing and Highlighting
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# ---------------------------------
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# Parse the raw file data into a list of two-tuples. Each tuple has the
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# form `[docs, code]` where both elements are arrays containing the
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# raw lines parsed from the input file. The first line is ignored if it
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# is a shebang line. We also ignore the PEP 263 encoding information in
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# python sourcefiles, and the similar ruby 1.9 syntax.
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def parse(data)
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sections = []
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docs, code = [], []
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lines = data.split("\n")
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lines.shift if lines[0] =~ /^\#\!/
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lines.shift if lines[0] =~ /coding[:=]\s*[-\w.]+/ and [ "python", "rb" ].include? @options[:language]
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lines.each do |line|
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case line
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when @comment_pattern
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if code.any?
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sections << [docs, code]
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docs, code = [], []
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end
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docs << line
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else
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code << line
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end
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end
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sections << [docs, code] if docs.any? || code.any?
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sections
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end
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# Take the list of paired *sections* two-tuples and split into two
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# separate lists: one holding the comments with leaders removed and
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# one with the code blocks.
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def split(sections)
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docs_blocks, code_blocks = [], []
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sections.each do |docs,code|
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docs_blocks << docs.map { |line| line.sub(@comment_pattern, '') }.join("\n")
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code_blocks << code.map do |line|
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tabs = line.match(/^(\t+)/)
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tabs ? line.sub(/^\t+/, ' ' * tabs.captures[0].length) : line
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end.join("\n")
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end
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[docs_blocks, code_blocks]
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end
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# Take the result of `split` and apply Markdown formatting to comments and
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# syntax highlighting to source code.
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def highlight(blocks)
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docs_blocks, code_blocks = blocks
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# Combine all docs blocks into a single big markdown document with section
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# dividers and run through the Markdown processor. Then split it back out
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# into separate sections.
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markdown = docs_blocks.join("\n\n##### DIVIDER\n\n")
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docs_html = Markdown.new(markdown, :smart).
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to_html.
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split(/\n*<h5>DIVIDER<\/h5>\n*/m)
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# Combine all code blocks into a single big stream and run through either
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# `pygmentize(1)` or <http://pygments.appspot.com>
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code_stream = code_blocks.join("\n\n#{@options[:comment_chars]} DIVIDER\n\n")
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if pygmentize?
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code_html = highlight_pygmentize(code_stream)
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else
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code_html = highlight_webservice(code_stream)
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end
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# Do some post-processing on the pygments output to split things back
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# into sections and remove partial `<pre>` blocks.
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code_html = code_html.
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split(/\n*<span class="c.?">#{@options[:comment_chars]} DIVIDER<\/span>\n*/m).
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map { |code| code.sub(/\n?<div class="highlight"><pre>/m, '') }.
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map { |code| code.sub(/\n?<\/pre><\/div>\n/m, '') }
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# Lastly, combine the docs and code lists back into a list of two-tuples.
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docs_html.zip(code_html)
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end
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# We `popen` a read/write pygmentize process in the parent and
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# then fork off a child process to write the input.
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def highlight_pygmentize(code)
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code_html = nil
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open("|pygmentize -l #{@options[:language]} -O encoding=utf-8 -f html", 'r+') do |fd|
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pid =
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fork {
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fd.close_read
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fd.write code
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fd.close_write
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exit!
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}
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fd.close_write
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code_html = fd.read
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fd.close_read
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Process.wait(pid)
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end
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code_html
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end
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# Pygments is not one of those things that's trivial for a ruby user to install,
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# so we'll fall back on a webservice to highlight the code if it isn't available.
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def highlight_webservice(code)
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Net::HTTP.post_form(
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URI.parse('http://pygments.appspot.com/'),
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{'lang' => @options[:language], 'code' => code}
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).body
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end
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end
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# And that's it.
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