Class: YARD::Docstring

Inherits:
String
  • Object
show all
Defined in:
lib/yard/docstring.rb

Overview

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.

Constant Summary collapse

META_MATCH =

Matches a tag at the start of a comment line

/^@([a-z_0-9]+)(?:\s+(.*))?$/i

Instance Attribute Summary collapse

Creating a Docstring Object collapse

Creating and Accessing Meta-data collapse

Instance Method Summary collapse

Methods inherited from String

#shell_split

Constructor Details

#initialize(content = '', object = nil) ⇒ Docstring

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

Examples:

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

Parameters:

  • content (String) (defaults to: '') —

    the raw comments to be parsed into a docstring and associated meta-data.

  • object (CodeObjects::Base) (defaults to: nil) —

    an object to associate the docstring with.



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# File 'lib/yard/docstring.rb', line 47

def initialize(content = '', object = nil)
  @object = object
  @summary = nil
  @hash_flag = false
  
  self.all = content
end

Instance Attribute Details

#all ⇒ String (readonly)

Returns the raw documentation (including raw tag text).

Returns:

  • (String) —

    the raw documentation (including raw tag text)



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# File 'lib/yard/docstring.rb', line 26

def all
  @all
end

#hash_flag ⇒ Boolean

Returns whether the docstring was started with “##”.

Returns:

  • (Boolean) —

    whether the docstring was started with “##”



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# File 'lib/yard/docstring.rb', line 29

def hash_flag
  @hash_flag
end

#line_range ⇒ Range

Returns line range in the #object‘s file where the docstring was parsed from.

Returns:

  • (Range) —

    line range in the #object‘s file where the docstring was parsed from



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# File 'lib/yard/docstring.rb', line 23

def line_range
  @line_range
end

#object ⇒ CodeObjects::Base

Returns the object that owns the docstring.

Returns:



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# File 'lib/yard/docstring.rb', line 20

def object
  @object
end

#ref_tags ⇒ Array<Tags::RefTag> (readonly)

Returns the list of reference tags.

Returns:



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# File 'lib/yard/docstring.rb', line 17

def ref_tags
  @ref_tags
end

Instance Method Details

#+(other) ⇒ Docstring

Adds another YARD::Docstring, copying over tags.

Parameters:

Returns:

  • (Docstring) —

    a new docstring with both docstrings combines



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# 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) ⇒ Object

Adds a tag or reftag object to the tag list

Parameters:



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# File 'lib/yard/docstring.rb', line 114

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

#blank?(only_visible_tags = true) ⇒ Boolean

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

Parameters:

  • only_visible_tags (Boolean) (defaults to: true) —

    whether only Tags::Library.visible_tags should be checked, or if all tags should be considered.

Returns:

  • (Boolean) —

    whether or not the docstring has content



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# File 'lib/yard/docstring.rb', line 164

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

#has_tag?(name) ⇒ Boolean

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

Parameters:

  • name (String) —

    the tag name to search for

Returns:

  • (Boolean) —

    whether or not the tag name was declared



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# File 'lib/yard/docstring.rb', line 155

def has_tag?(name)
  tags.any? {|tag| tag.tag_name.to_s == name.to_s }
end

#line ⇒ Fixnum

Returns the first line of the #line_range.

Returns:



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# File 'lib/yard/docstring.rb', line 81

def line
  line_range.first
end

#replace(content) ⇒ Object Also known as: all=

Replaces the docstring with new raw content. Called by #all=.

Parameters:

  • content (String) —

    the raw comments to be parsed



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# File 'lib/yard/docstring.rb', line 71

def replace(content)
  @tags, @ref_tags = [], []
  @all = content
  super parse_comments(content)
end

#summary ⇒ String

Gets the first line of a docstring to the period or the first paragraph.

Returns:

  • (String) —

    The first line or paragraph of the docstring; always ends with a period.



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# File 'lib/yard/docstring.rb', line 87

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) ⇒ Tags::Tag

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

Examples:

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

Parameters:

  • name (#to_s) —

    the tag name to return data for

Returns:



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# File 'lib/yard/docstring.rb', line 137

def tag(name)
  tags.find {|tag| tag.tag_name.to_s == name.to_s }
end

#tags(name = nil) ⇒ Array<Tags::Tag>

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

Parameters:

  • name (#to_s) (defaults to: nil) —

    the tag name to return data for, or nil for all tags

Returns:



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# File 'lib/yard/docstring.rb', line 145

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