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require 'time'
##
# 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}[http://www.gnu.org/prep/standards/html_node/Style-of-Change-Logs.html].
class RDoc::Parser::ChangeLog < RDoc::Parser
include RDoc::Parser::Text
parse_files_matching(/(\/|\\|\A)ChangeLog[^\/\\]*\z/)
##
# 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.
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.sub!(/\A\(/, '')
end
if last =~ /\s\z/ then
last << continuation
else
last << ' ' << continuation
end
end
##
# Creates an RDoc::Markup::Document given the +groups+ of ChangeLog entries.
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
##
# Returns a list of ChangeLog entries an RDoc::Markup nodes for the given
# +entries+.
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
##
# Returns an RDoc::Markup::List containing the given +items+ in the
# ChangeLog
def create_items items
list = RDoc::Markup::List.new :NOTE
items.each do |item|
item =~ /\A(.*?(?:\([^)]+\))?):\s*/
title = $1
body = $'
paragraph = RDoc::Markup::Paragraph.new body
list_item = RDoc::Markup::ListItem.new title, paragraph
list << list_item
end
list
end
##
# Groups +entries+ by date.
def group_entries entries
entries.group_by do |title, _|
begin
Time.parse(title).strftime '%Y-%m-%d'
rescue NoMethodError, ArgumentError
time, = title.split ' ', 2
Time.parse(time).strftime '%Y-%m-%d'
end
end
end
##
# Parses the entries in the ChangeLog.
#
# Returns an Array of each ChangeLog entry in order of parsing.
#
# A ChangeLog entry is an Array containing the ChangeLog title (date and
# committer) and an Array of ChangeLog items (file and function changed with
# description).
#
# An example result would be:
#
# [ 'Tue Dec 4 08:33:46 2012 Eric Hodel <drbrain@segment7.net>',
# [ 'README.EXT: Converted to RDoc format',
# 'README.EXT.ja: ditto']]
def parse_entries
entries = []
entry_name = nil
entry_body = []
@content.each_line do |line|
case line
when /^\s*$/ then
next
when /^\w.*/ then
entries << [entry_name, entry_body] if entry_name
entry_name = $&
begin
time = Time.parse entry_name
# 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
when /^(\t| {8})?\s*(\(.*)/ then # "\t(func): ..."
entry = $2
if entry_body.last =~ /:/ then
entry_body << entry
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
##
# Converts the ChangeLog into an RDoc::Markup::Document
def scan
entries = parse_entries
grouped_entries = group_entries entries
doc = create_document grouped_entries
@top_level.comment = doc
@top_level
end
end
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