Class: Linguist::Language

Inherits:
Object
  • Object
show all
Defined in:
lib/linguist/language.rb

Overview

Language names that are recognizable by GitHub. Defined languages can be highlighted, searched and listed under the Top Languages page.

Languages are defined in ‘lib/linguist/languages.yml`.

Constant Summary collapse

TYPES =

Valid Languages types

[:data, :markup, :programming, :prose]
STRATEGIES = 
[
  Linguist::Strategy::Modeline,
  Linguist::Shebang,
  Linguist::Strategy::Filename,
  Linguist::Heuristics,
  Linguist::Classifier
]

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(attributes = {}) ⇒ Language

Internal: Initialize a new Language

attributes - A hash of attributes



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# File 'lib/linguist/language.rb', line 294

def initialize(attributes = {})
  # @name is required
  @name = attributes[:name] || raise(ArgumentError, "missing name")

  # Set type
  @type = attributes[:type] ? attributes[:type].to_sym : nil
  if @type && !TYPES.include?(@type)
    raise ArgumentError, "invalid type: #{@type}"
  end

  @color = attributes[:color]

  # Set aliases
  @aliases = [default_alias_name] + (attributes[:aliases] || [])

  # Load the TextMate scope name or try to guess one
  @tm_scope = attributes[:tm_scope] || begin
    context = case @type
              when :data, :markup, :prose
                'text'
              when :programming, nil
                'source'
              end
    "#{context}.#{@name.downcase}"
  end

  @ace_mode = attributes[:ace_mode]
  @wrap = attributes[:wrap] || false

  # Set legacy search term
  @search_term = attributes[:search_term] || default_alias_name

  # Set extensions or default to [].
  @extensions = attributes[:extensions] || []
  @interpreters = attributes[:interpreters]   || []
  @filenames  = attributes[:filenames]  || []

  # Set popular, and searchable flags
  @popular    = attributes.key?(:popular)    ? attributes[:popular]    : false
  @searchable = attributes.key?(:searchable) ? attributes[:searchable] : true

  # If group name is set, save the name so we can lazy load it later
  if attributes[:group_name]
    @group = nil
    @group_name = attributes[:group_name]

  # Otherwise we can set it to self now
  else
    @group = self
  end
end

Instance Attribute Details

#ace_mode ⇒ Object (readonly)

Public: Get Ace mode

Examples

# => "text"
# => "javascript"
# => "c_cpp"

Returns a String name or nil



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# File 'lib/linguist/language.rb', line 402

def ace_mode
  @ace_mode
end

#aliases ⇒ Object (readonly)

Public: Get aliases

Examples

Language['C++'].aliases
# => ["cpp"]

Returns an Array of String names



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# File 'lib/linguist/language.rb', line 375

def aliases
  @aliases
end

#color ⇒ Object (readonly)

Public: Get color.

Returns a hex color String.



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# File 'lib/linguist/language.rb', line 365

def color
  @color
end

#extensions ⇒ Object (readonly)

Public: Get extensions

Examples

# => ['.rb', '.rake', ...]

Returns the extensions Array



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# File 'lib/linguist/language.rb', line 416

def extensions
  @extensions
end

#filenames ⇒ Object (readonly)

Public: Get filenames

Examples

# => ['Rakefile', ...]

Returns the extensions Array



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# File 'lib/linguist/language.rb', line 434

def filenames
  @filenames
end

#interpreters ⇒ Object (readonly)

Public: Get interpreters

Examples

# => ['awk', 'gawk', 'mawk' ...]

Returns the interpreters Array



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# File 'lib/linguist/language.rb', line 425

def interpreters
  @interpreters
end

#name ⇒ Object (readonly)

Public: Get proper name

Examples

# => "Ruby"
# => "Python"
# => "Perl"

Returns the name String



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# File 'lib/linguist/language.rb', line 355

def name
  @name
end

#search_term ⇒ Object (readonly)

Deprecated: Get code search term

Examples

# => "ruby"
# => "python"
# => "perl"

Returns the name String



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# File 'lib/linguist/language.rb', line 386

def search_term
  @search_term
end

#tm_scope ⇒ Object (readonly)

Public: Get the name of a TextMate-compatible scope

Returns the scope



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# File 'lib/linguist/language.rb', line 391

def tm_scope
  @tm_scope
end

#type ⇒ Object (readonly)

Public: Get type.

Returns a type Symbol or nil.



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# File 'lib/linguist/language.rb', line 360

def type
  @type
end

#wrap ⇒ Object (readonly)

Public: Should language lines be wrapped

Returns true or false



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# File 'lib/linguist/language.rb', line 407

def wrap
  @wrap
end

Class Method Details

.[](name) ⇒ Object

Public: Look up Language by its name.

name - The String name of the Language

Examples

Language['Ruby']
# => #<Language name="Ruby">

Language['ruby']
# => #<Language name="Ruby">

Returns the Language or nil if none was found.



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# File 'lib/linguist/language.rb', line 244

def self.[](name)
  return nil if name.to_s.empty?
  name && (@index[name.downcase] || @index[name.split(',').first.downcase])
end

.ace_modes ⇒ Object

Public: A List of languages compatible with Ace.

TODO: Remove this method in a 5.x release. Every language now needs an ace_mode key, so this function isn’t doing anything unique anymore.

Returns an Array of Languages.



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# File 'lib/linguist/language.rb', line 286

def self.ace_modes
  warn "This method will be deprecated in a future 5.x release. Every language now has an `ace_mode` set."
  @ace_modes ||= all.select(&:ace_mode).sort_by { |lang| lang.name.downcase }
end

.all ⇒ Object

Public: Get all Languages

Returns an Array of Languages



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# File 'lib/linguist/language.rb', line 138

def self.all
  @languages
end

.by_type(type) ⇒ Object

Detect languages by a specific type

type - A symbol that exists within TYPES

Returns an array



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# File 'lib/linguist/language.rb', line 40

def self.by_type(type)
  all.select { |h| h.type == type }
end

.colors ⇒ Object

Public: A List of languages with assigned colors.

Returns an Array of Languages.



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# File 'lib/linguist/language.rb', line 276

def self.colors
  @colors ||= all.select(&:color).sort_by { |lang| lang.name.downcase }
end

.create(attributes = {}) ⇒ Object

Internal: Create a new Language object

attributes - A hash of attributes

Returns a Language object



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# File 'lib/linguist/language.rb', line 49

def self.create(attributes = {})
  language = new(attributes)

  @languages << language

  # All Language names should be unique. Raise if there is a duplicate.
  if @name_index.key?(language.name)
    raise ArgumentError, "Duplicate language name: #{language.name}"
  end

  # Language name index
  @index[language.name.downcase] = @name_index[language.name.downcase] = language

  language.aliases.each do |name|
    # All Language aliases should be unique. Raise if there is a duplicate.
    if @alias_index.key?(name)
      raise ArgumentError, "Duplicate alias: #{name}"
    end

    @index[name.downcase] = @alias_index[name.downcase] = language
  end

  language.extensions.each do |extension|
    if extension !~ /^\./
      raise ArgumentError, "Extension is missing a '.': #{extension.inspect}"
    end

    @extension_index[extension.downcase] << language
  end

  language.interpreters.each do |interpreter|
    @interpreter_index[interpreter] << language
  end

  language.filenames.each do |filename|
    @filename_index[filename] << language
  end

  language
end

.detect(blob) ⇒ Object

Public: Detects the Language of the blob.

blob - an object that includes the Linguist ‘BlobHelper` interface;

see Linguist::LazyBlob and Linguist::FileBlob for examples

Returns Language or nil.



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# File 'lib/linguist/language.rb', line 104

def self.detect(blob)
  # Bail early if the blob is binary or empty.
  return nil if blob.likely_binary? || blob.binary? || blob.empty?

  Linguist.instrument("linguist.detection", :blob => blob) do
    # Call each strategy until one candidate is returned.
    languages = []
    returning_strategy = nil

    STRATEGIES.each do |strategy|
      returning_strategy = strategy
      candidates = Linguist.instrument("linguist.strategy", :blob => blob, :strategy => strategy, :candidates => languages) do
        strategy.call(blob, languages)
      end
      if candidates.size == 1
        languages = candidates
        break
      elsif candidates.size > 1
        # More than one candidate was found, pass them to the next strategy.
        languages = candidates
      else
        # No candidates, try the next strategy
      end
    end

    Linguist.instrument("linguist.detected", :blob => blob, :strategy => returning_strategy, :language => languages.first)

    languages.first
  end
end

.find_by_alias(name) ⇒ Object

Public: Look up Language by one of its aliases.

name - A String alias of the Language

Examples

Language.find_by_alias('cpp')
# => #<Language name="C++">

Returns the Language or nil if none was found.



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# File 'lib/linguist/language.rb', line 167

def self.find_by_alias(name)
  return nil if name.to_s.empty?
  name && (@alias_index[name.downcase] || @alias_index[name.split(',').first.downcase])
end

.find_by_extension(extname) ⇒ Object

Public: Look up Languages by file extension.

extname - The extension String.

Examples

Language.find_by_extension('.rb')
# => [#<Language name="Ruby">]

Language.find_by_extension('rb')
# => [#<Language name="Ruby">]

Returns all matching Languages or [] if none were found.



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# File 'lib/linguist/language.rb', line 206

def self.find_by_extension(extname)
  extname = ".#{extname}" unless extname.start_with?(".")
  @extension_index[extname.downcase]
end

.find_by_filename(filename) ⇒ Object

Public: Look up Languages by filename.

filename - The path String.

Examples

Language.find_by_filename('foo.rb')
# => [#<Language name="Ruby">]

Returns all matching Languages or [] if none were found.



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# File 'lib/linguist/language.rb', line 182

def self.find_by_filename(filename)
  basename = File.basename(filename)

  # find the first extension with language definitions
  extname = FileBlob.new(filename).extensions.detect do |e|
    !@extension_index[e].empty?
  end

  (@filename_index[basename] + @extension_index[extname]).compact.uniq
end

.find_by_interpreter(interpreter) ⇒ Object

Public: Look up Languages by interpreter.

interpreter - String of interpreter name

Examples

Language.find_by_interpreter("bash")
# => [#<Language name="Bash">]

Returns the matching Language



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# File 'lib/linguist/language.rb', line 226

def self.find_by_interpreter(interpreter)
  @interpreter_index[interpreter]
end

.find_by_name(name) ⇒ Object

Public: Look up Language by its proper name.

name - The String name of the Language

Examples

Language.find_by_name('Ruby')
# => #<Language name="Ruby">

Returns the Language or nil if none was found.



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# File 'lib/linguist/language.rb', line 152

def self.find_by_name(name)
  return nil if name.to_s.empty?
  name && (@name_index[name.downcase] || @name_index[name.split(',').first.downcase])
end

.find_by_shebang(data) ⇒ Object

DEPRECATED



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# File 'lib/linguist/language.rb', line 212

def self.find_by_shebang(data)
  @interpreter_index[Shebang.interpreter(data)]
end

.popular ⇒ Object

Public: A List of popular languages

Popular languages are sorted to the top of language chooser dropdowns.

This list is configured in “popular.yml”.

Returns an Array of Languages.



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# File 'lib/linguist/language.rb', line 257

def self.popular
  @popular ||= all.select(&:popular?).sort_by { |lang| lang.name.downcase }
end

.unpopular ⇒ Object

Public: A List of non-popular languages

Unpopular languages appear below popular ones in language chooser dropdowns.

This list is created from all the languages not listed in “popular.yml”.

Returns an Array of Languages.



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# File 'lib/linguist/language.rb', line 269

def self.unpopular
  @unpopular ||= all.select(&:unpopular?).sort_by { |lang| lang.name.downcase }
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/linguist/language.rb', line 508

def ==(other)
  eql?(other)
end

#default_alias_name ⇒ Object

Internal: Get default alias name

Returns the alias name String



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# File 'lib/linguist/language.rb', line 468

def default_alias_name
  name.downcase.gsub(/\s/, '-')
end

#eql?(other) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/linguist/language.rb', line 512

def eql?(other)
  equal?(other)
end

#escaped_name ⇒ Object

Public: Get URL escaped name.

Examples

"C%23"
"C%2B%2B"
"Common%20Lisp"

Returns the escaped String.



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# File 'lib/linguist/language.rb', line 461

def escaped_name
  EscapeUtils.escape_url(name).gsub('+', '%20')
end

#group ⇒ Object

Public: Get Language group

Returns a Language



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# File 'lib/linguist/language.rb', line 475

def group
  @group ||= Language.find_by_name(@group_name)
end

#hash ⇒ Object 



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# File 'lib/linguist/language.rb', line 516

def hash
  name.hash
end

#inspect ⇒ Object 



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# File 'lib/linguist/language.rb', line 520

def inspect
  "#<#{self.class} name=#{name}>"
end

#popular? ⇒ Boolean

Public: Is it popular?

Returns true or false

Returns:

  • (Boolean) 


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# File 'lib/linguist/language.rb', line 482

def popular?
  @popular
end

#primary_extension ⇒ Object

Deprecated: Get primary extension

Defaults to the first extension but can be overridden in the languages.yml.

The primary extension can not be nil. Tests should verify this.

This method is only used by app/helpers/gists_helper.rb for creating the language dropdown. It really should be using ‘name` instead. Would like to drop primary extension.

Returns the extension String.



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# File 'lib/linguist/language.rb', line 448

def primary_extension
  extensions.first
end

#searchable? ⇒ Boolean

Public: Is it searchable?

Unsearchable languages won’t by indexed by solr and won’t show up in the code search dropdown.

Returns true or false

Returns:

  • (Boolean) 


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# File 'lib/linguist/language.rb', line 499

def searchable?
  @searchable
end

#to_s ⇒ Object

Public: Return name as String representation



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# File 'lib/linguist/language.rb', line 504

def to_s
  name
end

#unpopular? ⇒ Boolean

Public: Is it not popular?

Returns true or false

Returns:

  • (Boolean) 


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# File 'lib/linguist/language.rb', line 489

def unpopular?
  !popular?
end