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require 'rdoc/markup'
require 'rdoc/encoding'
##
# Handle common directives that can occur in a block of text:
#
# \:include: filename
#
# Directives can be escaped by preceding them with a backslash.
#
# RDoc plugin authors can register additional directives to be handled by
# using RDoc::Markup::PreProcess::register
class RDoc::Markup::PreProcess
@registered = {}
##
# Registers +directive+ as one handled by RDoc. If a block is given the
# directive will be replaced by the result of the block, otherwise the
# directive will be removed from the processed text.
def self.register directive, &block
@registered[directive] = block
end
##
# Registered directives
def self.registered
@registered
end
##
# Creates a new pre-processor for +input_file_name+ that will look for
# included files in +include_path+
def initialize(input_file_name, include_path)
@input_file_name = input_file_name
@include_path = include_path
end
##
# Look for directives in a chunk of +text+.
#
# Options that we don't handle are yielded. If the block returns false the
# directive is restored to the text. If the block returns nil or no block
# was given the directive is handled according to the registered directives.
# If a String was returned the directive is replaced with the string.
#
# If no matching directive was registered the directive is restored to the
# text.
#
# If +code_object+ is given and the param is set as metadata on the
# +code_object+. See RDoc::CodeObject#metadata
def handle text, code_object = nil
# regexp helper (square brackets for optional)
# $1 $2 $3 $4 $5
# [prefix][\]:directive:[spaces][param]newline
text.gsub!(/^([ \t]*#?[ \t]*)(\\?):(\w+):([ \t]*)(.+)?\n/) do
# skip something like ':toto::'
next $& if $4.empty? and $5 and $5[0, 1] == ':'
# skip if escaped
next "#$1:#$3:#$4#$5\n" unless $2.empty?
prefix = $1
directive = $3.downcase
param = $5
case directive
when 'include' then
filename = param.split[0]
encoding = if defined?(Encoding) then text.encoding else nil end
include_file filename, prefix, encoding
when 'category' then
if RDoc::Context === code_object then
section = code_object.add_section param, ''
code_object.temporary_section = section
end
'' # ignore category if we're not on an RDoc::Context
else
result = yield directive, param if block_given?
case result
when nil then
code_object.metadata[directive] = param if code_object
if RDoc::Markup::PreProcess.registered.include? directive then
handler = RDoc::Markup::PreProcess.registered[directive]
result = handler.call directive, param if handler
else
result = "#{prefix}:#{directive}: #{param}\n"
end
when false then
result = "#{prefix}:#{directive}: #{param}\n"
end
result
end
end
text
end
##
# Handles the <tt>:include: _filename_</tt> directive.
#
# If the first line of the included file starts with '#', and contains
# an encoding information in the form 'coding:' or 'coding=', it is
# removed.
#
# If all lines in the included file start with a '#', this leading '#'
# is removed before inclusion. The included content is indented like
# the <tt>:include:</tt> directive.
#--
# so all content will be verbatim because of the likely space after '#'?
# TODO shift left the whole file content in that case
# TODO comment stop/start #-- and #++ in included file must be processed here
def include_file name, indent, encoding
full_name = find_include_file name
unless full_name then
warn "Couldn't find file to include '#{name}' from #{@input_file_name}"
return ''
end
content = RDoc::Encoding.read_file full_name, encoding, true
# strip magic comment
content = content.sub(/\A# .*coding[=:].*$/, '').lstrip
# strip leading '#'s, but only if all lines start with them
if content =~ /^[^#]/ then
content.gsub(/^/, indent)
else
content.gsub(/^#?/, indent)
end
end
##
# Look for the given file in the directory containing the current file,
# and then in each of the directories specified in the RDOC_INCLUDE path
def find_include_file(name)
to_search = [File.dirname(@input_file_name)].concat @include_path
to_search.each do |dir|
full_name = File.join(dir, name)
stat = File.stat(full_name) rescue next
return full_name if stat.readable?
end
nil
end
end
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