class RDoc::Parser::ChangeLog

A ChangeLog file parser.

This parser converts a ChangeLog into an RDoc::Markup::Document. When viewed as HTML a ChangeLog page will have an entry for each day’s entries in the sidebar table of contents.

This parser is meant to parse the MRI ChangeLog, but can be used to parse any GNU style Change Log.

Public Instance Methods

continue_entry_body(entry_body, continuation) click to toggle source

Attaches the continuation of the previous line to the entry_body.

Continued function listings are joined together as a single entry. Continued descriptions are joined to make a single paragraph.

# File rdoc/parser/changelog.rb, line 27
def continue_entry_body entry_body, continuation
  return unless last = entry_body.last

  if last =~ /\)\s*\z/ and continuation =~ /\A\(/ then
    last.sub!(/\)\s*\z/, ',')
    continuation = continuation.sub(/\A\(/, '')
  end

  if last =~ /\s\z/ then
    last << continuation
  else
    last << ' ' + continuation
  end
end

create_document(groups) click to toggle source

Creates an RDoc::Markup::Document given the groups of ChangeLog entries.

# File rdoc/parser/changelog.rb, line 45
def create_document groups
  doc = RDoc::Markup::Document.new
  doc.omit_headings_below = 2
  doc.file = @top_level

  doc << RDoc::Markup::Heading.new(1, File.basename(@file_name))
  doc << RDoc::Markup::BlankLine.new

  groups.sort_by do |day,| day end.reverse_each do |day, entries|
    doc << RDoc::Markup::Heading.new(2, day.dup)
    doc << RDoc::Markup::BlankLine.new

    doc.concat create_entries entries
  end

  doc
end

create_entries(entries) click to toggle source

Returns a list of ChangeLog entries an RDoc::Markup nodes for the given entries.

# File rdoc/parser/changelog.rb, line 67
def create_entries entries
  out = []

  entries.each do |entry, items|
    out << RDoc::Markup::Heading.new(3, entry)
    out << RDoc::Markup::BlankLine.new

    out << create_items(items)
  end

  out
end

create_items(items) click to toggle source

Returns an RDoc::Markup::List containing the given items in the ChangeLog

# File rdoc/parser/changelog.rb, line 84
def create_items items
  list = RDoc::Markup::List.new :NOTE

  items.each do |item|
    item =~ /\A(.*?(?:\([^)]+\))?):\s*/

    title = $1
    body = $'

    paragraph = RDoc::Markup::Paragraph.new body
    list_item = RDoc::Markup::ListItem.new title, paragraph
    list << list_item
  end

  list
end

group_entries(entries) click to toggle source

Groups entries by date.

# File rdoc/parser/changelog.rb, line 104
def group_entries entries
  @time_cache ||= {}
  entries.group_by do |title, _|
    begin
      time = @time_cache[title]
      (time || Time.parse(title)).strftime '%Y-%m-%d'
    rescue NoMethodError, ArgumentError
      time, = title.split '  ', 2
      Time.parse(time).strftime '%Y-%m-%d'
    end
  end
end

parse_entries() click to toggle source

Parses the entries in the ChangeLog.

Returns an Array of each ChangeLog entry in order of parsing.

A ChangeLog entry is an Array containing the ChangeLog title (date and committer) and an Array of ChangeLog items (file and function changed with description).

An example result would be:

[ 'Tue Dec  4 08:33:46 2012  Eric Hodel  <drbrain@segment7.net>',
  [ 'README.EXT:  Converted to RDoc format',
    'README.EXT.ja:  ditto']]

# File rdoc/parser/changelog.rb, line 132
def parse_entries
  @time_cache ||= {}
  entries = []
  entry_name = nil
  entry_body = []

  @content.each_line do |line|
    case line
    when /^\s*$/ then
      next
    when /^\w.*/ then
      entries << [entry_name, entry_body] if entry_name

      entry_name = $&

      begin
        time = Time.parse entry_name
        @time_cache[entry_name] = time
        # HACK Ruby 1.8 does not raise ArgumentError for Time.parse "Other"
        entry_name = nil unless entry_name =~ /#{time.year}/
      rescue NoMethodError
        # HACK Ruby 2.1.2 and earlier raises NoMethodError if time part is absent
        entry_name.split '  ', 2
      rescue ArgumentError
        if /out of range/ =~ $!.message
          Time.parse(entry_name.split('  ', 2)[0]) rescue entry_name = nil
        else
          entry_name = nil
        end
      end

      entry_body = []
    when /^(\t| {8})?\*\s*(.*)/ then # "\t* file.c (func): ..."
      entry_body << $2.dup
    when /^(\t| {8})?\s*(\(.*)/ then # "\t(func): ..."
      entry = $2

      if entry_body.last =~ /:/ then
        entry_body << entry.dup
      else
        continue_entry_body entry_body, entry
      end
    when /^(\t| {8})?\s*(.*)/ then
      continue_entry_body entry_body, $2
    end
  end

  entries << [entry_name, entry_body] if entry_name

  entries.reject! do |(entry,_)|
    entry == nil
  end

  entries
end

scan() click to toggle source

Converts the ChangeLog into an RDoc::Markup::Document

# File rdoc/parser/changelog.rb, line 191
def scan
  @time_cache = {}
  entries = parse_entries
  grouped_entries = group_entries entries

  doc = create_document grouped_entries

  @top_level.comment = doc

  @top_level
end