lib/yard/docstring_parser.rb in yard-0.9.18 vs lib/yard/docstring_parser.rb in yard-0.9.19

@@ -1,345 +1,345 @@
-# frozen_string_literal: true
-require 'ostruct'
-
-module YARD
-  # Parses text and creates a {Docstring} object to represent documentation
-  # for a {CodeObjects::Base}. To create a new docstring, you should initialize
-  # the parser and call {#parse} followed by {#to_docstring}.
-  #
-  # == Subclassing Notes
-  #
-  # The DocstringParser can be subclassed and subtituted during parsing by
-  # setting the {Docstring.default_parser} attribute with the name of the
-  # subclass. This allows developers to change the way docstrings are
-  # parsed, allowing for completely different docstring syntaxes.
-  #
-  # @example Creating a Docstring with a DocstringParser
-  #   DocstringParser.new.parse("text here").to_docstring
-  # @example Creating a Custom DocstringParser
-  #   # Parses docstrings backwards!
-  #   class ReverseDocstringParser
-  #     def parse_content(content)
-  #       super(content.reverse)
-  #     end
-  #   end
-  #
-  #   # Set the parser as default when parsing
-  #   YARD::Docstring.default_parser = ReverseDocstringParser
-  # @see #parse_content
-  # @since 0.8.0
-  class DocstringParser
-    # @return [String] the parsed text portion of the docstring,
-    #   with tags removed.
-    attr_accessor :text
-
-    # @return [String] the complete input string to the parser.
-    attr_accessor :raw_text
-
-    # @return [Array<Tags::Tag>] the list of meta-data tags identified
-    #   by the parser
-    attr_accessor :tags
-
-    # @return [Array<Tags::Directive>] a list of directives identified
-    #   by the parser. This list will not be passed on to the
-    #   Docstring object.
-    attr_accessor :directives
-
-    # @return [OpenStruct] any arbitrary state to be passed between
-    #   tags during parsing. Mainly used by directives to coordinate
-    #   behaviour (so that directives can be aware of other directives
-    #   used in a docstring).
-    attr_accessor :state
-
-    # @return [CodeObjects::Base, nil] the object associated with
-    #   the docstring being parsed. May be nil if the docstring is
-    #   not attached to any object.
-    attr_accessor :object
-
-    # @return [CodeObjects::Base, nil] the object referenced by
-    #   the docstring being parsed. May be nil if the docstring doesn't
-    #   refer to any object.
-    attr_accessor :reference
-
-    # @return [Handlers::Base, nil] the handler parsing this
-    #   docstring. May be nil if this docstring parser is not
-    #   initialized through
-    attr_accessor :handler
-
-    # @return [Tags::Library] the tag library being used to
-    #   identify registered tags in the docstring.
-    attr_accessor :library
-
-    # The regular expression to match the tag syntax
-    META_MATCH = /^@(!)?((?:\w\.?)+)(?:\s+(.*))?$/i
-
-    # @!group Creation and Conversion Methods
-
-    # Creates a new parser to parse docstring data
-    #
-    # @param [Tags::Library] library a tag library for recognizing
-    #   tags.
-    def initialize(library = Tags::Library.instance)
-      @text = ""
-      @raw_text = ""
-      @tags = []
-      @directives = []
-      @library = library
-      @object = nil
-      @reference = nil
-      @handler = nil
-      @state = OpenStruct.new
-    end
-
-    # @return [Docstring] translates parsed text into
-    #   a Docstring object.
-    def to_docstring
-      Docstring.new!(text, tags, object, raw_text, reference)
-    end
-
-    # @!group Parsing Methods
-
-    # Parses all content and returns itself.
-    #
-    # @param [String] content the docstring text to parse
-    # @param [CodeObjects::Base] object the object that the docstring
-    #   is attached to. Will be passed to directives to act on
-    #   this object.
-    # @param [Handlers::Base, nil] handler the handler object that is
-    #   parsing this object. May be nil if this parser is not being
-    #   called from a {Parser::SourceParser} context.
-    # @return [self] the parser object. To get the docstring,
-    #   call {#to_docstring}.
-    # @see #to_docstring
-    def parse(content, object = nil, handler = nil)
-      @object = object
-      @handler = handler
-      @reference, @raw_text = detect_reference(content)
-      text = parse_content(@raw_text)
-      @text = text.strip
-      call_directives_after_parse
-      post_process
-      self
-    end
-
-    # Parses a given block of text.
-    #
-    # @param [String] content the content to parse
-    # @note Subclasses can override this method to perform custom
-    #   parsing of content data.
-    def parse_content(content)
-      content = content.split(/\r?\n/) if content.is_a?(String)
-      return '' if !content || content.empty?
-      docstring = String.new("")
-
-      indent = content.first[/^\s*/].length
-      last_indent = 0
-      orig_indent = 0
-      directive = false
-      last_line = ""
-      tag_name = nil
-      tag_buf = []
-
-      (content + ['']).each_with_index do |line, index|
-        indent = line[/^\s*/].length
-        empty = (line =~ /^\s*$/ ? true : false)
-        done = content.size == index
-
-        if tag_name && (((indent < orig_indent && !empty) || done ||
-            (indent == 0 && !empty)) || (indent <= last_indent && line =~ META_MATCH))
-          buf = tag_buf.join("\n")
-          if directive || tag_is_directive?(tag_name)
-            directive = create_directive(tag_name, buf)
-            if directive
-              docstring << parse_content(directive.expanded_text).chomp
-            end
-          else
-            create_tag(tag_name, buf)
-          end
-          tag_name = nil
-          tag_buf = []
-          directive = false
-          orig_indent = 0
-        end
-
-        # Found a meta tag
-        if line =~ META_MATCH
-          directive = $1
-          tag_name = $2
-          tag_buf = [($3 || '')]
-        elsif tag_name && indent >= orig_indent && !empty
-          orig_indent = indent if orig_indent == 0
-          # Extra data added to the tag on the next line
-          last_empty = last_line =~ /^[ \t]*$/ ? true : false
-
-          tag_buf << '' if last_empty
-          tag_buf << line.gsub(/^[ \t]{#{orig_indent}}/, '')
-        elsif !tag_name
-          # Regular docstring text
-          docstring << line
-          docstring << "\n"
-        end
-
-        last_indent = indent
-        last_line = line
-      end
-
-      docstring
-    end
-
-    # @!group Parser Callback Methods
-
-    # Call post processing callbacks on parser.
-    # This is called implicitly by parser. Use this when
-    # manually configuring a {Docstring} object.
-    #
-    # @return [void]
-    def post_process
-      call_after_parse_callbacks
-    end
-
-    # @!group Tag Manipulation Methods
-
-    # Creates a tag from the {Tags::DefaultFactory tag factory}.
-    #
-    # To add an already created tag object, append it to {#tags}.
-    #
-    # @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
-    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
-
-      if library.has_tag?(tag_name)
-        @tags += [library.tag_create(tag_name, 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
-
-    # Creates a {Tags::RefTag}
-    def create_ref_tag(tag_name, name, object_name)
-      @tags << Tags::RefTagList.new(tag_name, P(object, object_name), name)
-    end
-
-    # Creates a new directive using the registered {#library}
-    # @return [Tags::Directive] the directive object that is created
-    def create_directive(tag_name, tag_buf)
-      if library.has_directive?(tag_name)
-        dir = library.directive_create(tag_name, tag_buf, self)
-        if dir.is_a?(Tags::Directive)
-          @directives << dir
-          dir
-        end
-      else
-        log.warn "Unknown directive @!#{tag_name}" +
-                 (object ? " in file `#{object.file}` near line #{object.line}" : "")
-        nil
-      end
-    rescue Tags::TagFormatError
-      log.warn "Invalid directive format for @!#{tag_name}" +
-               (object ? " in file `#{object.file}` near line #{object.line}" : "")
-      nil
-    end
-
-    # Backward compatibility to detect old tags that should be specified
-    # as directives in 0.8 and onward.
-    def tag_is_directive?(tag_name)
-      list = %w(attribute endgroup group macro method scope visibility)
-      list.include?(tag_name)
-    end
-
-    # Creates a callback that is called after a docstring is successfully
-    # parsed. Use this method to perform sanity checks on a docstring's
-    # tag data, or add any extra tags automatically to a docstring.
-    #
-    # @yield [parser] a block to be called after a docstring is parsed
-    # @yieldparam [DocstringParser] parser the docstring parser object
-    #   with all directives and tags created.
-    # @yieldreturn [void]
-    # @return [void]
-    def self.after_parse(&block)
-      after_parse_callbacks << block
-    end
-
-    # @return [Array<Proc>] the {after_parse} callback proc objects
-    def self.after_parse_callbacks
-      @after_parse_callbacks ||= []
-    end
-
-    # Define a callback to check that @param tags are properly named
-    after_parse do |parser|
-      next unless parser.object
-      next unless parser.object.is_a?(CodeObjects::MethodObject)
-      next if parser.object.is_alias?
-      names = parser.object.parameters.map {|l| l.first.gsub(/\W/, '') }
-      seen_names = []
-      infile_info = "\n    in file `#{parser.object.file}' " \
-                    "near line #{parser.object.line}"
-      parser.tags.each do |tag|
-        next if tag.is_a?(Tags::RefTagList) # we don't handle this yet
-        next unless tag.tag_name == "param"
-        if seen_names.include?(tag.name)
-          log.warn "@param tag has duplicate parameter name: " \
-                   "#{tag.name} #{infile_info}"
-        elsif names.include?(tag.name)
-          seen_names << tag.name
-        else
-          log.warn "@param tag has unknown parameter name: " \
-                   "#{tag.name} #{infile_info}"
-        end
-      end
-    end
-
-    private
-
-    def namespace
-      object && object.namespace
-    end
-
-    def detect_reference(content)
-      if content =~ /\A\s*\(see (\S+)\s*\)(?:\s|$)/
-        path = $1
-        extra = $'
-        [CodeObjects::Proxy.new(namespace, path), extra]
-      else
-        [nil, content]
-      end
-    end
-
-    # @!group Parser Callback Methods
-
-    # Calls the {Tags::Directive#after_parse} callback on all the
-    # created directives.
-    def call_directives_after_parse
-      directives.each(&:after_parse)
-    end
-
-    # Calls all {after_parse} callbacks
-    def call_after_parse_callbacks
-      self.class.after_parse_callbacks.each do |cb|
-        cb.call(self)
-      end
-    end
-
-    # Define a callback to check that @see tags do not use {}.
-    after_parse do |parser|
-      next unless parser.object
-
-      parser.tags.each_with_index do |tag, i|
-        next if tag.is_a?(Tags::RefTagList) # we don't handle this yet
-        next unless tag.tag_name == "see"
-        next unless "#{tag.name}#{tag.text}" =~ /\A\{.*\}\Z/
-        infile_info = "\n    in file `#{parser.object.file}' " \
-                      "near line #{parser.object.line}"
-        log.warn "@see tag (##{i + 1}) should not be wrapped in {} " \
-                 "(causes rendering issues): #{infile_info}"
-      end
-    end
-  end
-end
+# frozen_string_literal: true
+require 'ostruct'
+
+module YARD
+  # Parses text and creates a {Docstring} object to represent documentation
+  # for a {CodeObjects::Base}. To create a new docstring, you should initialize
+  # the parser and call {#parse} followed by {#to_docstring}.
+  #
+  # == Subclassing Notes
+  #
+  # The DocstringParser can be subclassed and subtituted during parsing by
+  # setting the {Docstring.default_parser} attribute with the name of the
+  # subclass. This allows developers to change the way docstrings are
+  # parsed, allowing for completely different docstring syntaxes.
+  #
+  # @example Creating a Docstring with a DocstringParser
+  #   DocstringParser.new.parse("text here").to_docstring
+  # @example Creating a Custom DocstringParser
+  #   # Parses docstrings backwards!
+  #   class ReverseDocstringParser
+  #     def parse_content(content)
+  #       super(content.reverse)
+  #     end
+  #   end
+  #
+  #   # Set the parser as default when parsing
+  #   YARD::Docstring.default_parser = ReverseDocstringParser
+  # @see #parse_content
+  # @since 0.8.0
+  class DocstringParser
+    # @return [String] the parsed text portion of the docstring,
+    #   with tags removed.
+    attr_accessor :text
+
+    # @return [String] the complete input string to the parser.
+    attr_accessor :raw_text
+
+    # @return [Array<Tags::Tag>] the list of meta-data tags identified
+    #   by the parser
+    attr_accessor :tags
+
+    # @return [Array<Tags::Directive>] a list of directives identified
+    #   by the parser. This list will not be passed on to the
+    #   Docstring object.
+    attr_accessor :directives
+
+    # @return [OpenStruct] any arbitrary state to be passed between
+    #   tags during parsing. Mainly used by directives to coordinate
+    #   behaviour (so that directives can be aware of other directives
+    #   used in a docstring).
+    attr_accessor :state
+
+    # @return [CodeObjects::Base, nil] the object associated with
+    #   the docstring being parsed. May be nil if the docstring is
+    #   not attached to any object.
+    attr_accessor :object
+
+    # @return [CodeObjects::Base, nil] the object referenced by
+    #   the docstring being parsed. May be nil if the docstring doesn't
+    #   refer to any object.
+    attr_accessor :reference
+
+    # @return [Handlers::Base, nil] the handler parsing this
+    #   docstring. May be nil if this docstring parser is not
+    #   initialized through
+    attr_accessor :handler
+
+    # @return [Tags::Library] the tag library being used to
+    #   identify registered tags in the docstring.
+    attr_accessor :library
+
+    # The regular expression to match the tag syntax
+    META_MATCH = /^@(!)?((?:\w\.?)+)(?:\s+(.*))?$/i
+
+    # @!group Creation and Conversion Methods
+
+    # Creates a new parser to parse docstring data
+    #
+    # @param [Tags::Library] library a tag library for recognizing
+    #   tags.
+    def initialize(library = Tags::Library.instance)
+      @text = ""
+      @raw_text = ""
+      @tags = []
+      @directives = []
+      @library = library
+      @object = nil
+      @reference = nil
+      @handler = nil
+      @state = OpenStruct.new
+    end
+
+    # @return [Docstring] translates parsed text into
+    #   a Docstring object.
+    def to_docstring
+      Docstring.new!(text, tags, object, raw_text, reference)
+    end
+
+    # @!group Parsing Methods
+
+    # Parses all content and returns itself.
+    #
+    # @param [String] content the docstring text to parse
+    # @param [CodeObjects::Base] object the object that the docstring
+    #   is attached to. Will be passed to directives to act on
+    #   this object.
+    # @param [Handlers::Base, nil] handler the handler object that is
+    #   parsing this object. May be nil if this parser is not being
+    #   called from a {Parser::SourceParser} context.
+    # @return [self] the parser object. To get the docstring,
+    #   call {#to_docstring}.
+    # @see #to_docstring
+    def parse(content, object = nil, handler = nil)
+      @object = object
+      @handler = handler
+      @reference, @raw_text = detect_reference(content)
+      text = parse_content(@raw_text)
+      @text = text.strip
+      call_directives_after_parse
+      post_process
+      self
+    end
+
+    # Parses a given block of text.
+    #
+    # @param [String] content the content to parse
+    # @note Subclasses can override this method to perform custom
+    #   parsing of content data.
+    def parse_content(content)
+      content = content.split(/\r?\n/) if content.is_a?(String)
+      return '' if !content || content.empty?
+      docstring = String.new("")
+
+      indent = content.first[/^\s*/].length
+      last_indent = 0
+      orig_indent = 0
+      directive = false
+      last_line = ""
+      tag_name = nil
+      tag_buf = []
+
+      (content + ['']).each_with_index do |line, index|
+        indent = line[/^\s*/].length
+        empty = (line =~ /^\s*$/ ? true : false)
+        done = content.size == index
+
+        if tag_name && (((indent < orig_indent && !empty) || done ||
+            (indent == 0 && !empty)) || (indent <= last_indent && line =~ META_MATCH))
+          buf = tag_buf.join("\n")
+          if directive || tag_is_directive?(tag_name)
+            directive = create_directive(tag_name, buf)
+            if directive
+              docstring << parse_content(directive.expanded_text).chomp
+            end
+          else
+            create_tag(tag_name, buf)
+          end
+          tag_name = nil
+          tag_buf = []
+          directive = false
+          orig_indent = 0
+        end
+
+        # Found a meta tag
+        if line =~ META_MATCH
+          directive = $1
+          tag_name = $2
+          tag_buf = [($3 || '')]
+        elsif tag_name && indent >= orig_indent && !empty
+          orig_indent = indent if orig_indent == 0
+          # Extra data added to the tag on the next line
+          last_empty = last_line =~ /^[ \t]*$/ ? true : false
+
+          tag_buf << '' if last_empty
+          tag_buf << line.gsub(/^[ \t]{#{orig_indent}}/, '')
+        elsif !tag_name
+          # Regular docstring text
+          docstring << line
+          docstring << "\n"
+        end
+
+        last_indent = indent
+        last_line = line
+      end
+
+      docstring
+    end
+
+    # @!group Parser Callback Methods
+
+    # Call post processing callbacks on parser.
+    # This is called implicitly by parser. Use this when
+    # manually configuring a {Docstring} object.
+    #
+    # @return [void]
+    def post_process
+      call_after_parse_callbacks
+    end
+
+    # @!group Tag Manipulation Methods
+
+    # Creates a tag from the {Tags::DefaultFactory tag factory}.
+    #
+    # To add an already created tag object, append it to {#tags}.
+    #
+    # @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
+    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
+
+      if library.has_tag?(tag_name)
+        @tags += [library.tag_create(tag_name, 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
+
+    # Creates a {Tags::RefTag}
+    def create_ref_tag(tag_name, name, object_name)
+      @tags << Tags::RefTagList.new(tag_name, P(object, object_name), name)
+    end
+
+    # Creates a new directive using the registered {#library}
+    # @return [Tags::Directive] the directive object that is created
+    def create_directive(tag_name, tag_buf)
+      if library.has_directive?(tag_name)
+        dir = library.directive_create(tag_name, tag_buf, self)
+        if dir.is_a?(Tags::Directive)
+          @directives << dir
+          dir
+        end
+      else
+        log.warn "Unknown directive @!#{tag_name}" +
+                 (object ? " in file `#{object.file}` near line #{object.line}" : "")
+        nil
+      end
+    rescue Tags::TagFormatError
+      log.warn "Invalid directive format for @!#{tag_name}" +
+               (object ? " in file `#{object.file}` near line #{object.line}" : "")
+      nil
+    end
+
+    # Backward compatibility to detect old tags that should be specified
+    # as directives in 0.8 and onward.
+    def tag_is_directive?(tag_name)
+      list = %w(attribute endgroup group macro method scope visibility)
+      list.include?(tag_name)
+    end
+
+    # Creates a callback that is called after a docstring is successfully
+    # parsed. Use this method to perform sanity checks on a docstring's
+    # tag data, or add any extra tags automatically to a docstring.
+    #
+    # @yield [parser] a block to be called after a docstring is parsed
+    # @yieldparam [DocstringParser] parser the docstring parser object
+    #   with all directives and tags created.
+    # @yieldreturn [void]
+    # @return [void]
+    def self.after_parse(&block)
+      after_parse_callbacks << block
+    end
+
+    # @return [Array<Proc>] the {after_parse} callback proc objects
+    def self.after_parse_callbacks
+      @after_parse_callbacks ||= []
+    end
+
+    # Define a callback to check that @param tags are properly named
+    after_parse do |parser|
+      next unless parser.object
+      next unless parser.object.is_a?(CodeObjects::MethodObject)
+      next if parser.object.is_alias?
+      names = parser.object.parameters.map {|l| l.first.gsub(/\W/, '') }
+      seen_names = []
+      infile_info = "\n    in file `#{parser.object.file}' " \
+                    "near line #{parser.object.line}"
+      parser.tags.each do |tag|
+        next if tag.is_a?(Tags::RefTagList) # we don't handle this yet
+        next unless tag.tag_name == "param"
+        if seen_names.include?(tag.name)
+          log.warn "@param tag has duplicate parameter name: " \
+                   "#{tag.name} #{infile_info}"
+        elsif names.include?(tag.name)
+          seen_names << tag.name
+        else
+          log.warn "@param tag has unknown parameter name: " \
+                   "#{tag.name} #{infile_info}"
+        end
+      end
+    end
+
+    private
+
+    def namespace
+      object && object.namespace
+    end
+
+    def detect_reference(content)
+      if content =~ /\A\s*\(see (\S+)\s*\)(?:\s|$)/
+        path = $1
+        extra = $'
+        [CodeObjects::Proxy.new(namespace, path), extra]
+      else
+        [nil, content]
+      end
+    end
+
+    # @!group Parser Callback Methods
+
+    # Calls the {Tags::Directive#after_parse} callback on all the
+    # created directives.
+    def call_directives_after_parse
+      directives.each(&:after_parse)
+    end
+
+    # Calls all {after_parse} callbacks
+    def call_after_parse_callbacks
+      self.class.after_parse_callbacks.each do |cb|
+        cb.call(self)
+      end
+    end
+
+    # Define a callback to check that @see tags do not use {}.
+    after_parse do |parser|
+      next unless parser.object
+
+      parser.tags.each_with_index do |tag, i|
+        next if tag.is_a?(Tags::RefTagList) # we don't handle this yet
+        next unless tag.tag_name == "see"
+        next unless "#{tag.name}#{tag.text}" =~ /\A\{.*\}\Z/
+        infile_info = "\n    in file `#{parser.object.file}' " \
+                      "near line #{parser.object.line}"
+        log.warn "@see tag (##{i + 1}) should not be wrapped in {} " \
+                 "(causes rendering issues): #{infile_info}"
+      end
+    end
+  end
+end