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YARD::Docstring

A documentation string, or "docstring" for short, encapsulates the comments and metadata, or "tags", of an object. Meta-data is expressed in the form +@tag VALUE+, where VALUE can span over multiple lines as long as they are indented. The following +@example+ tag shows how tags can be indented:

# @example My example
#   a = "hello world"
#   a.reverse
# @version 1.0

Tags can be nested in a documentation string, though the {Tags::Tag} itself is responsible for parsing the inner tags.

Constants

META_MATCH

Matches a tag at the start of a comment line

Attributes

all[R]

@return [String] the raw documentation (including raw tag text)

hash_flag[R]

@return [Boolean] whether the docstring was started with "##"

line_range[RW]

@return [Range] line range in the {object}'s file where the docstring was parsed from

object[RW]

@return [CodeObjects::Base] the object that owns the docstring.

ref_tags[R]

@return [Array<Tags::RefTag>] the list of reference tags

Public Class Methods

new(content = '', object = nil) click to toggle source

Creates a new docstring with the raw contents attached to an optional object.

@example

Docstring.new("hello world\n@return Object return", someobj)

@param [String] content the raw comments to be parsed into a docstring

and associated meta-data.

@param [CodeObjects::Base] object an object to associate the docstring

with.
# File lib/yard/docstring.rb, line 47
def initialize(content = '', object = nil)
  @object = object
  @summary = nil
  @hash_flag = false

  self.all = content
end

Public Instance Methods

+(other) click to toggle source

Adds another {Docstring}, copying over tags.

@param [Docstring, String] other the other docstring (or string) to

add.

@return [Docstring] a new docstring with both docstrings combines

# File lib/yard/docstring.rb, line 60
def +(other)
  case other
  when Docstring
    Docstring.new([all, other.all].join("\n"), object)
  else
    super
  end
end
add_tag(*tags) click to toggle source

Adds a tag or reftag object to the tag list. If you want to parse tag data based on the {Tags::DefaultFactory} tag factory, use {create_tag} instead.

@param [Tags::Tag, Tags::RefTag] tags list of tag objects to add @return [void]

# File lib/yard/docstring.rb, line 185
def add_tag(*tags)
  tags.each_with_index do |tag, i|
    case tag
    when Tags::Tag
      tag.object = object
      @tags << tag
    when Tags::RefTag
      @ref_tags << tag
    else
      raise ArgumentError, "expected Tag or RefTag, got #{tag.class} (at index #{i})"
    end
  end
end
all=(content) click to toggle source
Alias for: replace
blank?(only_visible_tags = true) click to toggle source

Returns true if the docstring has no content that is visible to a template.

@param [Boolean] only_visible_tags whether only {Tags::Library.visible_tags}

should be checked, or if all tags should be considered.

@return [Boolean] whether or not the docstring has content

# File lib/yard/docstring.rb, line 253
def blank?(only_visible_tags = true)
  if only_visible_tags
    empty? && !tags.any? {|tag| Tags::Library.visible_tags.include?(tag.tag_name.to_sym) }
  else
    empty? && @tags.empty? && @ref_tags.empty?
  end
end
create_tag(tag_name, tag_buf) click to toggle source

Creates a tag from the {Tags::DefaultFactory tag factory}.

To add an already created tag object, use {add_tag}

@param [String] tag_name the tag name @param [String] tag_buf the text attached to the tag with newlines removed. @return [Tags::Tag, Tags::RefTag] a tag

# File lib/yard/docstring.rb, line 163
def create_tag(tag_name, tag_buf)
  if tag_buf =~ /\A\s*(?:(\S+)\s+)?\(\s*see\s+(\S+)\s*\)\s*\Z/
    return create_ref_tag(tag_name, $1, $2)
  end

  tag_factory = Tags::Library.instance
  tag_method = "#{tag_name}_tag"
  if tag_name && tag_factory.respond_to?(tag_method)
    add_tag(*[tag_factory.send(tag_method, tag_buf)].flatten)
  else
    log.warn "Unknown tag @#{tag_name}" + (object ? " in file `#{object.file}` near line #{object.line}" : "")
  end
rescue Tags::TagFormatError
  log.warn "Invalid tag format for @#{tag_name}" + (object ? " in file `#{object.file}` near line #{object.line}" : "")
end
delete_tag_if(&block) click to toggle source

Deletes all tags where the block returns true @yieldparam [Tags::Tag] tag the tag that is being tested @yieldreturn [Boolean] true if the tag should be deleted @return [void] @since 0.7.0

# File lib/yard/docstring.rb, line 243
def delete_tag_if(&block)
  @tags.delete_if(&block)
  @ref_tags.delete_if(&block)
end
delete_tags(name) click to toggle source

Delete all tags with name @param [String] name the tag name @return [void] @since 0.7.0

# File lib/yard/docstring.rb, line 234
def delete_tags(name)
  delete_tag_if {|tag| tag.tag_name.to_s == name.to_s }
end
dup() click to toggle source

Deep-copies a docstring

@note This method creates a new docstring with new tag lists, but does

not create new individual tags. Modifying the tag objects will still
affect the original tags.

@return [Docstring] a new copied docstring @since 0.7.0

# File lib/yard/docstring.rb, line 86
def dup
  obj = super
  %(all summary tags ref_tags).each do |name|
    val = instance_variable_get("@#{name}")
    obj.instance_variable_set("@#{name}", val ? val.dup : nil)
  end
  obj
end
has_tag?(name) click to toggle source

Returns true if at least one tag by the name name was declared

@param [String] name the tag name to search for @return [Boolean] whether or not the tag name was declared

# File lib/yard/docstring.rb, line 226
def has_tag?(name)
  tags.any? {|tag| tag.tag_name.to_s == name.to_s }
end
hash_flag=(v) click to toggle source
# File lib/yard/docstring.rb, line 30
def hash_flag=(v) @hash_flag = v == nil ? false : v end
line() click to toggle source

@return [Fixnum] the first line of the {line_range} @return [nil] if there is no associated {line_range}

# File lib/yard/docstring.rb, line 99
def line
  line_range ? line_range.first : nil
end
replace(content) click to toggle source

Replaces the docstring with new raw content. Called by {all=}. @param [String] content the raw comments to be parsed

# File lib/yard/docstring.rb, line 71
def replace(content)
  content = content.join("\n") if content.is_a?(Array)
  @tags, @ref_tags = [], []
  @all = content
  super parse_comments(content)
end
Also aliased as: all=
summary() click to toggle source

Gets the first line of a docstring to the period or the first paragraph. @return [String] The first line or paragraph of the docstring; always ends with a period.

# File lib/yard/docstring.rb, line 105
def summary
  return @summary if @summary
  open_parens = ['{', '(', '[']
  close_parens = ['}', ')', ']']
  num_parens = 0
  idx = length.times do |index|
    case self[index, 1]
    when ".", "\r", "\n"
      next_char = self[index + 1, 1].to_s
      if num_parens == 0 && next_char =~ /^\s*$/
        break index - 1
      end
    when "{", "(", "["
      num_parens += 1
    when "}", ")", "]"
      num_parens -= 1
    end
  end
  @summary = self[0..idx]
  @summary += '.' unless @summary.empty?
  @summary
end
tag(name) click to toggle source

Convenience method to return the first tag object in the list of tag objects of that name

@example

doc = Docstring.new("@return zero when nil")
doc.tag(:return).text  # => "zero when nil"

@param [to_s] name the tag name to return data for @return [Tags::Tag] the first tag in the list of {tags}

# File lib/yard/docstring.rb, line 208
def tag(name)
  tags.find {|tag| tag.tag_name.to_s == name.to_s }
end
tags(name = nil) click to toggle source

Returns a list of tags specified by name or all tags if name is not specified.

@param [to_s] name the tag name to return data for, or nil for all tags @return [Array<Tags::Tag>] the list of tags by the specified tag name

# File lib/yard/docstring.rb, line 216
def tags(name = nil)
  list = @tags + convert_ref_tags
  return list unless name
  list.select {|tag| tag.tag_name.to_s == name.to_s }
end
to_raw() click to toggle source

Reformats and returns a raw representation of the tag data using the current tag and docstring data, not the original text.

@return [String] the updated raw formatted docstring data @since 0.7.0 @todo Add Tags::Tag#to_raw and refactor

# File lib/yard/docstring.rb, line 134
def to_raw
  tag_data = tags.sort_by {|t| t.tag_name }.map do |tag|
    case tag
    when Tags::OverloadTag
      tag_text = "@#{tag.tag_name} #{tag.signature}\n"
      unless tag.docstring.blank?
        tag_text += "\n" + tag.docstring.all.gsub(/\r?\n/, "\n  ")
      end
    else
      tag_text = '@' + tag.tag_name
      tag_text += ' [' + tag.types.join(', ') + ']' if tag.types
      tag_text += ' ' + tag.name.to_s if tag.name
      tag_text += "\n " if tag.name && tag.text
      tag_text += ' ' + tag.text.strip.gsub(/\n/, "\n  ") if tag.text
    end
    tag_text
  end
  [strip, tag_data.join("\n")].reject {|l| l.empty? }.compact.join("\n")
end

[Validate]

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