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# :markup: tomdoc
# A parser for TomDoc based on TomDoc 1.0.0-rc1 (02adef9b5a)
#
# The TomDoc specification can be found at:
#
# http://tomdoc.org
#
# The latest version of the TomDoc specification can be found at:
#
# https://github.com/mojombo/tomdoc/blob/master/tomdoc.md
#
# To choose TomDoc as your only default format see RDoc::Options@Saved+Options
# for instructions on setting up a <code>.rdoc_options</code> file to store
# your project default.
#
# There are a few differences between this parser and the specification. A
# best-effort was made to follow the specification as closely as possible but
# some choices to deviate were made.
#
# A future version of RDoc will warn when a MUST or MUST NOT is violated and
# may warn when a SHOULD or SHOULD NOT is violated. RDoc will always try
# to emit documentation even if given invalid TomDoc.
#
# Here are some implementation choices this parser currently makes:
#
# This parser allows rdoc-style inline markup but you should not depended on
# it.
#
# This parser allows a space between the comment and the method body.
#
# This parser does not require the default value to be described for an
# optional argument.
#
# This parser does not examine the order of sections. An Examples section may
# precede the Arguments section.
#
# This class is documented in TomDoc format. Since this is a subclass of the
# RDoc markup parser there isn't much to see here, unfortunately.
class RDoc::TomDoc < RDoc::Markup::Parser
# Internal: Token accessor
attr_reader :tokens
# Internal: Adds a post-processor which sets the RDoc section based on the
# comment's status.
#
# Returns nothing.
def self.add_post_processor # :nodoc:
RDoc::Markup::PreProcess.post_process do |comment, code_object|
next unless code_object and
RDoc::Comment === comment and comment.format == 'tomdoc'
comment.text.gsub!(/(\A\s*# )(Public|Internal|Deprecated):\s+/) do
section = code_object.add_section $2
code_object.temporary_section = section
$1
end
end
end
add_post_processor
# Public: Parses TomDoc from text
#
# text - A String containing TomDoc-format text.
#
# Examples
#
# RDoc::TomDoc.parse <<-TOMDOC
# This method does some things
#
# Returns nothing.
# TOMDOC
# # => #<RDoc::Markup::Document:0xXXX @parts=[...], @file=nil>
#
# Returns an RDoc::Markup::Document representing the TomDoc format.
def self.parse text
parser = new
parser.tokenize text
doc = RDoc::Markup::Document.new
parser.parse doc
doc
end
# Internal: Extracts the Signature section's method signature
#
# comment - An RDoc::Comment that will be parsed and have the signature
# extracted
#
# Returns a String containing the signature and nil if not
def self.signature comment
return unless comment.tomdoc?
document = comment.parse
signature = nil
found_heading = false
found_signature = false
document.parts.delete_if do |part|
next false if found_signature
found_heading ||=
RDoc::Markup::Heading === part && part.text == 'Signature'
next false unless found_heading
next true if RDoc::Markup::BlankLine === part
if RDoc::Markup::Verbatim === part then
signature = part
found_signature = true
end
end
signature and signature.text
end
# Public: Creates a new TomDoc parser. See also RDoc::Markup::parse
def initialize
super
@section = nil
@seen_returns = false
end
# Internal: Builds a heading from the token stream
#
# level - The level of heading to create
#
# Returns an RDoc::Markup::Heading
def build_heading level
heading = super
@section = heading.text
heading
end
# Internal: Builds a verbatim from the token stream. A verbatim in the
# Examples section will be marked as in Ruby format.
#
# margin - The indentation from the margin for lines that belong to this
# verbatim section.
#
# Returns an RDoc::Markup::Verbatim
def build_verbatim margin
verbatim = super
verbatim.format = :ruby if @section == 'Examples'
verbatim
end
# Internal: Builds a paragraph from the token stream
#
# margin - Unused
#
# Returns an RDoc::Markup::Paragraph.
def build_paragraph margin
p :paragraph_start => margin if @debug
paragraph = RDoc::Markup::Paragraph.new
until @tokens.empty? do
type, data, = get
case type
when :TEXT then
@section = 'Returns' if data =~ /\AReturns/
paragraph << data
when :NEWLINE then
if :TEXT == peek_token[0] then
paragraph << ' '
else
break
end
else
unget
break
end
end
p :paragraph_end => margin if @debug
paragraph
end
##
# Detects a section change to "Returns" and adds a heading
def parse_text parent, indent # :nodoc:
paragraph = build_paragraph indent
if false == @seen_returns and 'Returns' == @section then
@seen_returns = true
parent << RDoc::Markup::Heading.new(3, 'Returns')
parent << RDoc::Markup::BlankLine.new
end
parent << paragraph
end
# Internal: Turns text into an Array of tokens
#
# text - A String containing TomDoc-format text.
#
# Returns self.
def tokenize text
text.sub!(/\A(Public|Internal|Deprecated):\s+/, '')
setup_scanner text
until @s.eos? do
pos = @s.pos
# leading spaces will be reflected by the column of the next token
# the only thing we loose are trailing spaces at the end of the file
next if @s.scan(/ +/)
@tokens << case
when @s.scan(/\r?\n/) then
token = [:NEWLINE, @s.matched, *token_pos(pos)]
@line_pos = char_pos @s.pos
@line += 1
token
when @s.scan(/(Examples|Signature)$/) then
@tokens << [:HEADER, 3, *token_pos(pos)]
[:TEXT, @s[1], *token_pos(pos)]
when @s.scan(/([:\w][\w\[\]]*)[ ]+- /) then
[:NOTE, @s[1], *token_pos(pos)]
else
@s.scan(/.*/)
[:TEXT, @s.matched.sub(/\r$/, ''), *token_pos(pos)]
end
end
self
end
end