145 lines
3.6 KiB
Ruby
145 lines
3.6 KiB
Ruby
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#--
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# Copyright (C) 2006 Andrea Censi <andrea (at) rubyforge.org>
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#
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# This file is part of Maruku.
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#
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# Maruku is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# Maruku is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Maruku; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#++
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module MaRuKu; module In; module Markdown; module SpanLevelParser
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# This class helps me read and sanitize HTML blocks
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# I tried to do this with REXML, but wasn't able to. (suggestions?)
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class HTMLHelper
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include MaRuKu::Strings
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Tag = %r{^<(/)?(\w+)\s*([^>]*)>}m
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EverythingElse = %r{^[^<]+}m
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CommentStart = %r{^<!--}x
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CommentEnd = %r{^.*-->}
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TO_SANITIZE = ['img','hr']
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# attr_accessor :inside_comment
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attr_reader :rest
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def initialize
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@rest = ""
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@tag_stack = []
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@m = nil
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@already = ""
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@inside_comment = false
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end
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def eat_this(line)
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@rest = line + @rest
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things_read = 0
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until @rest.empty?
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if @inside_comment
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if @m = CommentEnd.match(@rest)
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@inside_comment = false
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@already += @m.pre_match + @m.to_s
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@rest = @m.post_match
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elsif @m = EverythingElse.match(@rest)
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@already += @m.pre_match + @m.to_s
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@rest = @m.post_match
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end
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else
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if @m = CommentStart.match(@rest)
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things_read += 1
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@inside_comment = true
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@already += @m.pre_match + @m.to_s
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@rest = @m.post_match
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elsif @m = Tag.match(@rest)
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things_read += 1
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@already += @m.pre_match
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@rest = @m.post_match
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is_closing = !!@m[1]
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tag = @m[2]
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attributes = @m[3]
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is_single = false
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if attributes =~ /\A(.*)\/\Z/
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attributes = $1
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is_single = true
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end
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if TO_SANITIZE.include? tag
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attributes.strip!
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# puts "Attributes: #{attributes.inspect}"
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if attributes.size > 0
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@already += '<%s %s />' % [tag, attributes]
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else
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@already += '<%s />' % [tag]
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end
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elsif is_closing
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@already += @m.to_s
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if @tag_stack.empty?
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error "Malformed: closing tag #{tag.inspect} "+
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"in empty list"
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end
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if @tag_stack.last != tag
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error "Malformed: tag <#{tag}> "+
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"closes <#{@tag_stack.last}>"
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end
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@tag_stack.pop
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elsif not is_single
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@tag_stack.push tag
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@already += @m.to_s
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end
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elsif @m = EverythingElse.match(@rest)
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@already += @m.pre_match + @m.to_s
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@rest = @m.post_match
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else
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error "Malformed HTML: not complete: #{@rest.inspect}"
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end
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end # not inside comment
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# puts inspect
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# puts "Read: #{@tag_stack.inspect}"
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break if is_finished? and things_read>0
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end
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end
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def error(s)
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raise Exception, "Error: #{s} \n"+ inspect, caller
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end
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def inspect; "HTML READER\n comment=#{@inside_comment} "+
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"match=#{@m.to_s.inspect}\n"+
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"Tag stack = #{@tag_stack.inspect} \n"+
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"Before:\n"+
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add_tabs(@already,1,'|')+"\n"+
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"After:\n"+
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add_tabs(@rest,1,'|')+"\n"
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end
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def stuff_you_read
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@already
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end
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def is_finished?
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not @inside_comment and @tag_stack.empty?
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end
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end # html helper
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end end end end
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