# 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 lib/rdoc/parser/changelog.rb, line 26
    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 lib/rdoc/parser/changelog.rb, line 44
    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 lib/rdoc/parser/changelog.rb, line 66
    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 lib/rdoc/parser/changelog.rb, line 83
    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 lib/rdoc/parser/changelog.rb, line 103
    def group_entries entries
      @time_cache ||= {}
      entries.group_by do |title, _|
        begin
          time = @time_cache[title]
          (time || parse_date(title)).strftime '%Y-%m-%d'
        rescue NoMethodError, ArgumentError
          time, = title.split '  ', 2
          parse_date(time).strftime '%Y-%m-%d'
        end
      end
    end

parse_date(date) click to toggle source

Parse date in ISO-8601, RFC-2822, or default of `Git`

    # File lib/rdoc/parser/changelog.rb, line 119
    def parse_date(date)
      case date
      when /\A\s*(\d+)-(\d+)-(\d+)(?:[ T](\d+):(\d+):(\d+) *([-+]\d\d):?(\d\d))?\b/
        Time.new($1, $2, $3, $4, $5, $6, ("#{$7}:#{$8}" if $7))
      when /\A\s*\w{3}, +(\d+) (\w{3}) (\d+) (\d+):(\d+):(\d+) *(?:([-+]\d\d):?(\d\d))\b/
        Time.new($3, $2, $1, $4, $5, $6, ("#{$7}:#{$8}" if $7))
      when /\A\s*\w{3} (\w{3}) +(\d+) (\d+) (\d+):(\d+):(\d+) *(?:([-+]\d\d):?(\d\d))\b/
        Time.new($3, $1, $2, $4, $5, $6, ("#{$7}:#{$8}" if $7))
      when /\A\s*\w{3} (\w{3}) +(\d+) (\d+):(\d+):(\d+) (\d+)\b/
        Time.new($6, $1, $2, $3, $4, $5)
      else
        raise ArgumentError, "bad date: #{date}"
      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 lib/rdoc/parser/changelog.rb, line 149
    def parse_entries
      @time_cache ||= {}

      if /\A((?:.*\n){,3})commit\s/ =~ @content
        class << self; prepend Git; end
        parse_info($1)
        return parse_entries
      end

      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 = parse_date entry_name
            @time_cache[entry_name] = time
          rescue ArgumentError
            entry_name = nil
          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 lib/rdoc/parser/changelog.rb, line 206
    def scan
      @time_cache = {}

      entries = parse_entries
      grouped_entries = group_entries entries

      doc = create_document grouped_entries

      @top_level.comment = doc

      @top_level
    end