Class: WebRI

Inherits:
Object
  • Object
show all
Defined in:
lib/webri.rb,
lib/webri/version.rb

Overview

A class to display Ruby online HTML documentation.

Defined Under Namespace

Classes: ClassEntry, Entry, FileEntry, InstanceMethodEntry, SingletonMethodEntry

Constant Summary collapse

DocSite =

Site of the official documentation.

'https://docs.ruby-lang.org/en/'
VERSION = 
"1.0.3"

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ WebRI

Get the info from the Ruby doc site’s table of contents and build our @index_for_type.



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# File 'lib/webri.rb', line 35

def initialize(options = {})
  capture_options(options)
  set_doc_release
  get_toc_html
  build_indexes
  print_info if @info
  print @noreline
  if os_type == :linux && !@noreline
    repl_reline
  else
    repl_plain
  end
end

Instance Method Details

#build_indexes ⇒ Object 



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# File 'lib/webri.rb', line 147

def build_indexes
  # Index for each type of entry.
  # Each index has a hash; key is name, value is array of URIs.
  @index_for_type = {
    class: {}, # Has both classes and modules.
    singleton_method: {},
    instance_method: {},
    page: {},
  }
  # Iterate over the lines of the TOC page.
  lines = @toc_html.split("\n")
  i = 0
  while i < lines.count
    item_line = lines[i]
    i += 1
    next unless item_line.match('<li class="(\w+)"')
    class_attr_value = $1 # Save for later.
    # We have a pair of lines such as:
    #     <li class="file">
    #       <a href="COPYING.html">COPYING</a>
    anchor_line = lines[i] # Second line of pair.
    # Consume anchor_line.
    i += 1
    # We capture variables thus:
    # - +type+ is the value of attribute 'class'.
    # - +path+ is the value of attribute 'href'.
    # - +full_name+ is the HTML text.
    type = class_attr_value
    _, path, rest = anchor_line.split('"')
    full_name = rest.split(/<|>/)[1]
    full_name = CGI.unescapeHTML(full_name)
    case type
    when 'class', 'module'
      index = @index_for_type[:class]
      if index.include?(full_name)
        entry = index[full_name]
      else
        entry = ClassEntry.new(full_name)
        index[full_name] = entry
      end
      entry.paths.push(path) unless entry.paths.include?(path)
    when 'file'
      index = @index_for_type[:page]
      if index.include?(full_name)
        entry = index[full_name]
      else
        entry = FileEntry.new(full_name)
        index[full_name] = entry
      end
      entry.paths.push(path) unless entry.paths.include?(path)
    when 'method'
      case anchor_line
      when /method-c-/
        index = @index_for_type[:singleton_method]
        if index.include?(full_name)
          entry = index[full_name]
        else
          entry = SingletonMethodEntry.new(full_name)
          index[full_name] = entry
        end
        entry.paths.push(path) unless entry.paths.include?(path)
      when /method-i-/
        index = @index_for_type[:instance_method]
        if index.include?(full_name)
          entry = index[full_name]
        else
          entry = InstanceMethodEntry.new(full_name)
          index[full_name] = entry
        end
        entry.paths.push(path) unless entry.paths.include?(path)
      else
        fail anchor_line
      end
    else
      fail class_attr_val
    end
  end
end

#capture_options(options) ⇒ Object 



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# File 'lib/webri.rb', line 226

def capture_options(options)
  @noop = options[:noop]
  @info = options[:info]
  @noreline = options[:noreline]
  @doc_release = options[:release]
end

#get_boolean_answer(question) ⇒ Object

Present question; return answer.



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# File 'lib/webri.rb', line 575

def get_boolean_answer(question)
  print "#{question} (y or n):  "
  $stdout.flush
  $stdin.gets.match(/y/i) ? true : false
end

#get_choice(choices) ⇒ Object

Present choices; return choice.



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# File 'lib/webri.rb', line 550

def get_choice(choices)
  index = nil
  range = (0..choices.size - 1)
  until range.include?(index)
    choices.each_with_index do |choice, i|
      s = "%6d" % i
      puts "  #{s}:  #{choice}"
    end
    while true
      print "Type a number to choose, or Return to skip:  "
      $stdout.flush
      response = $stdin.gets
      case response
      when /(\d+)/
        return choices[$1.to_i]
      when "\n"
        return nil
      else

      end
    end
  end
end

#get_toc_html ⇒ Object 



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# File 'lib/webri.rb', line 233

def get_toc_html
  # Construct the doc release; e.g., '3.4'.
  # Get the doc table of contents as a temp file.
  @toc_url = DocSite + @doc_release + '/table_of_contents.html'
  begin
    toc_file = URI.open(@toc_url)
    @toc_html = toc_file.read
  rescue Socket::ResolutionError => x
    message = "#{x.class}: #{x.message}\nPossibly not connected to internet."
    $stderr.puts(message)
    exit
  end
end

#open_page(name, target_uri) ⇒ Object

Open URL in browser.



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# File 'lib/webri.rb', line 588

def open_page(name, target_uri)
  uri = URI.parse(File.join(DocSite, @doc_release, target_uri.to_s))
  open_uri(name, uri)
end

#open_readme ⇒ Object 



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# File 'lib/webri.rb', line 581

def open_readme
  url = 'https://github.com/BurdetteLamar/webri/blob/main/README.md'
  uri = URI.parse(url)
  open_uri('README',uri)
end

#open_uri(name, target_uri) ⇒ Object 



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# File 'lib/webri.rb', line 620

def open_uri(name, target_uri)
  full_url = target_uri.to_s
  url, fragment = full_url.split('#')
  message = "Opening web page #{url}"
  if fragment
    message += " at method #{name}"
  end
  message += '.'
  puts message
  command = "#{opener_name} #{full_url}"
  if @noop
    puts "Command: '#{command}'"
  else
    system(command)
  end
end

#opener_name ⇒ Object 



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# File 'lib/webri.rb', line 606

def opener_name
  case os_type
  when :linux
    'xdg-open'
  when :windows
    'start'
  when :macos
    'open'
  else
    message = "No opener name for #{os_type}"
    raise RuntimeError(message)
  end
end

#os_type ⇒ Object 



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# File 'lib/webri.rb', line 593

def os_type
  case RbConfig::CONFIG['host_os']
  when /linux|bsd|arch/
    :linux
  when /darwin/
    :macos
  when /mswin|windows|32/
    :windows
  else
    :unknown
  end
end

#print_info ⇒ Object 



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# File 'lib/webri.rb', line 136

def print_info
  puts "Ruby documentation release:  #{@doc_release}"
  puts "Ruby documentation URL:      #{@toc_url}"
  puts "Executable to open page:     #{opener_name}"
  puts "Names:"
  @index_for_type.each_pair do |type, items|
    puts format("  %5d %s names", items.count, type)
  end
  exit
end

#repl_plain ⇒ Object

Read-evaluate-print loop, without Reline.



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# File 'lib/webri.rb', line 49

def repl_plain # Read-evaluate-print loop, without Reline.
  while true
    $stdout.write('webri> ')
    $stdout.flush
    response = $stdin.gets.chomp
    exit if response == 'exit'
    next if response.empty?
    if response.split(' ').size > 1
      puts "One name at a time, please."
      next
    end
    show(response)
  end
end

#repl_reline ⇒ Object

Read-evaluate-print loop, with Reline.



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# File 'lib/webri.rb', line 64

def repl_reline # Read-evaluate-print loop, with Reline.
  begin
    stty_save = `stty -g`.chomp
  rescue
  end

  begin
    completion_words= []
    @index_for_type.each_pair do |type, index|
      if type == :page
        completion_words += index.keys.map {|name| 'ruby:' + name }
      else
        completion_words += index.keys
      end
    end
    Reline.completion_proc = proc { |word|
      completion_words
    }
    while line = Reline.readline("webri> ", true)
      case line.chomp
      when 'exit'
        exit 0
      when ''
        # NOOP
      else
        if line.split(' ').size > 1
          puts "One name at a time, please."
          next
        end
        show(line)
      end
    end
  rescue Interrupt
    puts '^C'
    `stty #{stty_save}` if stty_save
    exit 0
  end
  puts
end

#set_doc_release ⇒ Object 



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# File 'lib/webri.rb', line 104

def set_doc_release
  supported_releases = []
  unsupported_releases = []
  master_release = nil
  io = URI.open('https://docs.ruby-lang.org/en/')
  lines = io.readlines
  lines.each do |line|
    next unless line.match(/<a/)
    doc = REXML::Document.new(line)
    _, release, end_of_support = doc.root.text.split(' ')
    break if release.start_with?('2')
    if end_of_support
      unsupported_releases.push(release)
    elsif release == 'master'
      master_release = release
    else
      supported_releases.push(release)
    end
  end
  all_releases = [master_release] + supported_releases + unsupported_releases
  if @doc_release
    unless all_releases.include?(@doc_release)
      puts "Unknown documentation release:  #{@doc_release}"
      puts "Available releases: #{all_releases.join(' ')}"
      exit
    end
  else
    a = RUBY_VERSION.split('.')
    @doc_release ||= a[0..1].join('.')
  end
end

#show(name) ⇒ Object

Show a page of Ruby documentation.



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# File 'lib/webri.rb', line 320

def show(name)
  # Figure out what's asked for.
  case
  when name.match(/^[A-Z]/)
    show_class(name, @index_for_type[:class])
  when %w[fatal fata fat fa f].include?(name)
    show_class(name, @index_for_type[:class])
  when name.start_with?('ruby:')
    show_file(name, @index_for_type[:page])
  when name.start_with?('::')
    show_singleton_method(name, @index_for_type[:singleton_method])
  when name.start_with?('#')
    show_instance_method(name, @index_for_type[:instance_method])
  when name == '@help'
    show_help
  when name == '@readme'
    open_readme
  # when name.start_with?('.')
  #   show_method(name, @index_for_type[:singleton_method], @index_for_type[:instance_method])
  # when name.match(/^[a-z]/)
  #   show_method(name, @index_for_type[:singleton_method], @index_for_type[:instance_method])
  else
    puts "No documentation available for name '#{name}'."
  end
end

#show_class(name, class_index) ⇒ Object

Show class.



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# File 'lib/webri.rb', line 347

def show_class(name, class_index)
  all_entries = @index_for_type[:class]
  all_choices = ClassEntry.choices(all_entries)
  # Find entries whose names that start with name.
  selected_entries = all_entries.select do |key, value|
    key.start_with?(name)
  end
  # Find paths for selected_choices
  selected_paths = []
  selected_entries.each_pair do |name, entry|
    entry.paths.each do |path|
      selected_paths.push(path)
    end
  end
  case selected_paths.size
  when 1
    selected_choices = ClassEntry.choices(selected_entries)
    choice = selected_choices.keys.first
    path = selected_choices.values.first
    puts "Found one class/module name starting with '#{name}'\n  #{choice}"
    full_name = ClassEntry.full_name_for_choice(choice)
    if name != full_name
      message = "Open page #{path}?"
      return unless get_boolean_answer(message)
    end
    path
  when 0
    puts "Found no class/module name starting with '#{name}'."
    message = "Show #{all_choices.size} class/module names?"
    return unless get_boolean_answer(message)
    choice_index = get_choice(all_choices.keys)
    return if choice_index.nil?
    path = all_choices[choice_index]
  else
    selected_choices = ClassEntry.choices(selected_entries)
    puts "Found #{selected_choices.size} class/module names starting with '#{name}'."
    message = "Show #{selected_choices.size} class/module names?'"
    return unless get_boolean_answer(message)
    key = get_choice(selected_choices.keys)
    return if key.nil?
    path = selected_choices[key]
  end
  uri = Entry.uri(path)
  open_page(name, uri)
end

#show_file(name, file_index) ⇒ Object

Show page.



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# File 'lib/webri.rb', line 394

def show_file(name, file_index)
  # Target page is a free-standing page such as 'COPYING'.
  name = name.sub(/^ruby:/, '') # Discard leading 'ruby:'
  all_entries = @index_for_type[:page]
  all_choices = FileEntry.choices(all_entries)
  # Find entries whose names that start with name.
  selected_entries = all_entries.select do |key, value|
    key.start_with?(name)
  end
  # Find paths for selected_choices
  selected_paths = []
  selected_entries.each_pair do |name, entry|
    entry.paths.each do |path|
      selected_paths.push(path)
    end
  end
  case selected_paths.size
  when 1
    selected_choices = FileEntry.choices(selected_entries)
    choice = selected_choices.keys.first
    path = selected_choices.values.first
    puts "Found one page name starting with '#{name}'\n  #{choice}"
    full_name = FileEntry.full_name_for_choice(choice)
    if name != full_name
      message = "Open page #{path}?"
      return unless get_boolean_answer(message)
    end
    path
  when 0
    puts "Found no page name starting with '#{name}'."
    message = "Show names of all #{all_choices.size} pages?"
    return unless get_boolean_answer(message)
    key = get_choice(all_choices.keys)
    return if key.nil?
    path = all_choices[key]
  else
    selected_choices = FileEntry.choices(selected_entries)
    puts "Found #{selected_choices.size} page names starting with '#{name}'."
    message = "Show #{selected_choices.size} names?'"
    return unless get_boolean_answer(message)
    key = get_choice(selected_choices.keys)
    return if key.nil?
    path = selected_choices[key]
  end
  uri = Entry.uri(path)
  open_page(name, uri)
end

#show_help ⇒ Object 



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# File 'lib/webri.rb', line 540

def show_help
  puts 'Showing help.'
  puts `ruby bin/webri --help`
end

#show_instance_method(name, instance_method_index) ⇒ Object

Show instance method.



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# File 'lib/webri.rb', line 492

def show_instance_method(name, instance_method_index)
  # Target page is an instance method such as #to_s.
  all_entries = @index_for_type[:instance_method]
  all_choices = InstanceMethodEntry.choices(all_entries)
  # Find entries whose names that start with name.
  selected_entries = all_entries.select do |key, value|
    key.start_with?(name)
  end
  # Find paths for selected_choices
  selected_paths = []
  selected_entries.each_pair do |name, entry|
    entry.paths.each do |path|
      selected_paths.push(path)
    end
  end
  selected_choices = InstanceMethodEntry.choices(selected_entries)
  case selected_paths.size
  when 1
    full_name = selected_entries.keys.first
    path = selected_choices.values.first
    puts "Found one instance method name starting with '#{name}'\n  #{full_name}"
    if name != full_name
      uri = URI.parse(path)
      message = "Open page #{uri.path} at method #{full_name}?"
      return unless get_boolean_answer(message)
    end
    path
  when 0
    puts "Found no instance method name starting with '#{name}'."
    message = "Show names of all #{all_choices.size} instance methods?"
    return unless get_boolean_answer(message)
    choice = get_choice(all_choices.keys)
    return if choice.nil?
    path = all_choices[choice]
    full_name = InstanceMethodEntry.full_name_for_choice(choice)
  else
    puts "Found #{selected_paths.size} instance method names starting with '#{name}'."
    message = "Show #{selected_paths.size} names?'"
    return unless get_boolean_answer(message)
    choice = get_choice(selected_choices.keys)
    return if choice.nil?
    path = all_choices[choice]
    full_name = InstanceMethodEntry.full_name_for_choice(choice)
  end
  uri = Entry.uri(path)
  open_page(full_name, uri)
end

#show_readme ⇒ Object 



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# File 'lib/webri.rb', line 545

def show_readme
  open_readme
end

#show_singleton_method(name, singleton_method_index) ⇒ Object

Show singleton method.



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# File 'lib/webri.rb', line 443

def show_singleton_method(name, singleton_method_index)
  # Target page is a singleton method such as ::new.
  all_entries = @index_for_type[:singleton_method]
  all_choices = SingletonMethodEntry.choices(all_entries)
  # Find entries whose names that start with name.
  selected_entries = all_entries.select do |key, value|
    key.start_with?(name)
  end
  # Find paths for selected_choices
  selected_paths = []
  selected_entries.each_pair do |name, entry|
    entry.paths.each do |path|
      selected_paths.push(path)
    end
  end
  selected_choices = SingletonMethodEntry.choices(selected_entries)
  case selected_paths.size
  when 1
    full_name = selected_entries.keys.first
    path = selected_choices.values.first
    puts "Found one singleton method name starting with '#{name}'\n  #{full_name}"
    if name != full_name
      uri = URI.parse(path)
      message = "Open page #{uri.path} at method #{full_name}?"
      return unless get_boolean_answer(message)
    end
    path
  when 0
    puts "Found no singleton method name starting with '#{name}'."
    message = "Show names of all #{all_choices.size} singleton methods?"
    return unless get_boolean_answer(message)
    choice = get_choice(all_choices.keys)
    return if choice.nil?
    full_name = SingletonMethodEntry.full_name_for_choice(choice)
    path = all_choices[choice]
  else
    puts "Found #{selected_paths.size} singleton method names starting with '#{name}'."
    message = "Show #{selected_paths.size} names?'"
    return unless get_boolean_answer(message)
    choice = get_choice(selected_choices.keys)
    return if choice.nil?
    full_name = SingletonMethodEntry.full_name_for_choice(choice)
    path = all_choices[choice]
  end
  uri = Entry.uri(path)
  open_page(full_name, uri)
end