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Fix Recursive Includes

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Another very amusing 3-year old bug from the main Instiki Bug Tracker
(don't they ever fix anything?): the chunk-handling code was supposed
to prevent recursive [[!include ...]] statements. Alas, instead of
actually preventing them it would -- when it encountered a recursive
include -- churn away until Rails ran out of stack space.

Fixed.
This commit is contained in:
Jacques Distler 2008-12-21 02:47:45 -06:00
parent dcd3e63ae8
commit 91eb8f5fbf
1 changed files with 17 additions and 14 deletions
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19
lib/chunks/include.rb
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@ -10,12 +10,14 @@ require 'chunks/wiki'
class Include < WikiChunk::WikiReference
INCLUDE_PATTERN = /\[\[!include\s+([^\]\s][^\]]+?)\s*\]\]/i
@@included_by = []
def self.pattern() INCLUDE_PATTERN end
def initialize(match_data, content)
super
@page_name = match_data[1].strip
rendering_mode = content.options[:mode] || :show
@@included_by.push(@content.page_name)
@unmask_text = get_unmask_text_avoiding_recursion_loops(rendering_mode)
end
@ -23,25 +25,26 @@ class Include < WikiChunk::WikiReference
def get_unmask_text_avoiding_recursion_loops(rendering_mode)
if refpage
if @@included_by.include?(refpage.page.name)
@content.delete_chunk(self)
@@included_by = []
return "<em>Recursive include detected: #{@content.page_name} &#x2192; #{@content.page_name}</em>\n"
end
# TODO This way of instantiating a renderer is ugly.
renderer = PageRenderer.new(refpage.current_revision)
if renderer.wiki_includes.include?(@content.page_name)
# this will break the recursion
@content.delete_chunk(self)
return "<em>Recursive include detected; #{@page_name} --> #{@content.page_name} " +
"--> #{@page_name}</em>\n"
else
included_content =
case rendering_mode
when :show then renderer.display_content
when :publish then renderer.display_published
when :export then renderer.display_content_for_export
else raise "Unsupported rendering mode #{@mode.inspect}"
else
raise "Unsupported rendering mode #{@mode.inspect}"
end
@content.merge_chunks(included_content)
@@included_by = []
return included_content.pre_rendered
end
else
@@included_by = []
return "<em>Could not include #{@page_name}</em>\n"
end
end