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Diffstat (limited to 'railties/lib/rails/source_annotation_extractor.rb')
| -rw-r--r-- | railties/lib/rails/source_annotation_extractor.rb | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/railties/lib/rails/source_annotation_extractor.rb b/railties/lib/rails/source_annotation_extractor.rb new file mode 100644 index 0000000000..1db6c98537 --- /dev/null +++ b/railties/lib/rails/source_annotation_extractor.rb @@ -0,0 +1,141 @@ +# frozen_string_literal: true + +# Implements the logic behind the rake tasks for annotations like +# +# rails notes +# rails notes:optimize +# +# and friends. See <tt>rails -T notes</tt> and <tt>railties/lib/rails/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 + Annotation = Struct.new(:line, :tag, :text) do + def self.directories + @@directories ||= %w(app config db lib test) + (ENV["SOURCE_ANNOTATION_DIRECTORIES"] || "").split(",") + end + + # Registers additional directories to be included + # SourceAnnotationExtractor::Annotation.register_directories("spec", "another") + def self.register_directories(*dirs) + directories.push(*dirs) + end + + def self.extensions + @@extensions ||= {} + end + + # Registers new Annotations File Extensions + # SourceAnnotationExtractor::Annotation.register_extensions("css", "scss", "sass", "less", "js") { |tag| /\/\/\s*(#{tag}):?\s*(.*)$/ } + def self.register_extensions(*exts, &block) + extensions[/\.(#{exts.join("|")})$/] = block + end + + register_extensions("builder", "rb", "rake", "yml", "yaml", "ruby") { |tag| /#\s*(#{tag}):?\s*(.*)$/ } + register_extensions("css", "js") { |tag| /\/\/\s*(#{tag}):?\s*(.*)$/ } + register_extensions("erb") { |tag| /<%\s*#\s*(#{tag}):?\s*(.*?)\s*%>/ } + + # 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 = "[#{line.to_s.rjust(options[:indent])}] ".dup + s << "[#{tag}] " if options[:tag] + s << text + end + end + + # Prints all annotations with tag +tag+ under the root directories +app+, + # +config+, +db+, +lib+, and +test+ (recursively). + # + # Additional directories may be added using a comma-delimited list set using + # <tt>ENV['SOURCE_ANNOTATION_DIRECTORIES']</tt>. + # + # Directories may also be explicitly set using the <tt>:dirs</tt> key in +options+. + # + # SourceAnnotationExtractor.enumerate 'TODO|FIXME', dirs: %w(app lib), tag: true + # + # If +options+ has a <tt>:tag</tt> flag, it will be passed to each annotation's +to_s+. + # + # See <tt>#find_in</tt> for a list of file extensions that will be taken into account. + # + # This class method is the single entry point for the rake tasks. + def self.enumerate(tag, options = {}) + extractor = new(tag) + dirs = options.delete(:dirs) || Annotation.directories + extractor.display(extractor.find(dirs), 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. + def find(dirs) + 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. Files + # with extension +.builder+, +.rb+, +.rake+, +.yml+, +.yaml+, +.ruby+, + # +.css+, +.js+ 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)) + else + extension = Annotation.extensions.detect do |regexp, _block| + regexp.match(item) + end + + if extension + pattern = extension.last.call(tag) + results.update(extract_annotations_from(item, pattern)) if pattern + end + 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, encoding: Encoding::BINARY).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 = {}) + options[:indent] = results.flat_map { |f, a| a.map(&:line) }.max.to_s.size + results.keys.sort.each do |file| + puts "#{file}:" + results[file].each do |note| + puts " * #{note.to_s(options)}" + end + puts + end + end +end |