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# Implements the logic behind the rake tasks for annotations like
#
# rake notes
# rake notes:optimize
#
# and friends. See <tt>rake -T notes</tt> and <tt>railties/lib/tasks/annotations.rake</tt>.
#
# Annotation objects are triplets <tt>:line</tt>, <tt>:tag</tt>, <tt>:text</tt> that
# represent the line where the annotation lives, its tag, and its text. Note
# the filename is not stored.
#
# Annotations are looked for in comments and modulus whitespace they have to
# start with the tag optionally followed by a colon. Everything up to the end
# of the line (or closing ERB comment tag) is considered to be their text.
class SourceAnnotationExtractor
class Annotation < Struct.new(:line, :tag, :text)
# Returns a representation of the annotation that looks like this:
#
# [126] [TODO] This algorithm is simple and clearly correct, make it faster.
#
# If +options+ has a flag <tt>:tag</tt> the tag is shown as in the example above.
# Otherwise the string contains just line and text.
def to_s(options={})
s = "[%3d] " % line
s << "[#{tag}] " if options[:tag]
s << text
end
end
# Prints all annotations with tag +tag+ under the root directories +app+, +config+, +lib+,
# +script+, and +test+ (recursively). Only filenames with extension
# +.builder+, +.rb+, and +.erb+ are taken into account. The +options+
# hash is passed to each annotation's +to_s+.
#
# This class method is the single entry point for the rake tasks.
def self.enumerate(tag, options={})
extractor = new(tag)
extractor.display(extractor.find, options)
end
attr_reader :tag
def initialize(tag)
@tag = tag
end
# Returns a hash that maps filenames under +dirs+ (recursively) to arrays
# with their annotations. Only files with annotations are included, and only
# those with extension +.builder+, +.rb+, and +.erb+
# are taken into account.
def find(dirs=%w(app config lib script test))
dirs.inject({}) { |h, dir| h.update(find_in(dir)) }
end
# Returns a hash that maps filenames under +dir+ (recursively) to arrays
# with their annotations. Only files with annotations are included, and only
# those with extension +.builder+, +.rb+, and +.erb+
# are taken into account.
def find_in(dir)
results = {}
Dir.glob("#{dir}/*") do |item|
next if File.basename(item)[0] == ?.
if File.directory?(item)
results.update(find_in(item))
elsif item =~ /\.(builder|rb)$/
results.update(extract_annotations_from(item, /#\s*(#{tag}):?\s*(.*)$/))
elsif item =~ /\.erb$/
results.update(extract_annotations_from(item, /<%\s*#\s*(#{tag}):?\s*(.*?)\s*%>/))
end
end
results
end
# If +file+ is the filename of a file that contains annotations this method returns
# a hash with a single entry that maps +file+ to an array of its annotations.
# Otherwise it returns an empty hash.
def extract_annotations_from(file, pattern)
lineno = 0
result = File.readlines(file).inject([]) do |list, line|
lineno += 1
next list unless line =~ pattern
list << Annotation.new(lineno, $1, $2)
end
result.empty? ? {} : { file => result }
end
# Prints the mapping from filenames to annotations in +results+ ordered by filename.
# The +options+ hash is passed to each annotation's +to_s+.
def display(results, options={})
results.keys.sort.each do |file|
puts "#{file}:"
results[file].each do |note|
puts " * #{note.to_s(options)}"
end
puts
end
end
end
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