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require 'rdoc/markup'
##
# Handle common directives that can occur in a block of text:
#
# : include : filename
#
# RDoc plugin authors can register additional directives to be handled through
# 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
text.gsub!(/^([ \t]*#?[ \t]*):(\w+):([ \t]*)(.+)?\n/) do
next $& if $3.empty? and $4 and $4[0, 1] == ':'
prefix = $1
directive = $2.downcase
param = $4
case directive
when 'include' then
filename = param.split[0]
include_file filename, prefix
else
result = yield directive, param if block_given?
case result
when nil then
code_object.metadata[directive] = param if code_object
if RDoc::Markup::PreProcess.registered.include? directive then
handler = RDoc::Markup::PreProcess.registered[directive]
result = handler.call directive, param if handler
else
result = "#{prefix}:#{directive}: #{param}\n"
end
when false then
result = "#{prefix}:#{directive}: #{param}\n"
end
result
end
end
text
end
##
# Include a file, indenting it correctly.
def include_file(name, indent)
if full_name = find_include_file(name) then
content = if defined?(Encoding) then
File.binread full_name
else
File.read full_name
end
# HACK determine content type and force encoding
content = content.sub(/\A# .*coding[=:].*$/, '').lstrip
# strip leading '#'s, but only if all lines start with them
if content =~ /^[^#]/ then
content.gsub(/^/, indent)
else
content.gsub(/^#?/, indent)
end
else
warn "Couldn't find file to include '#{name}' from #{@input_file_name}"
''
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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