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[booh] / lib / booh / rexml / dtd / entitydecl.rb
1 require "booh/rexml/child"
2 module REXML
3         module DTD
4                 class EntityDecl < Child
5                         START = "<!ENTITY"
6                         START_RE = /^\s*#{START}/um
7                         PUBLIC = /^\s*#{START}\s+(?:%\s+)?(\w+)\s+PUBLIC\s+((["']).*?\3)\s+((["']).*?\5)\s*>/um
8                         SYSTEM = /^\s*#{START}\s+(?:%\s+)?(\w+)\s+SYSTEM\s+((["']).*?\3)(?:\s+NDATA\s+\w+)?\s*>/um
9                         PLAIN = /^\s*#{START}\s+(\w+)\s+((["']).*?\3)\s*>/um
10                         PERCENT = /^\s*#{START}\s+%\s+(\w+)\s+((["']).*?\3)\s*>/um
11                         # <!ENTITY name SYSTEM "...">
12                         # <!ENTITY name "...">
13                         def initialize src
14                                 super()
15                                 md = nil
16                                 if src.match( PUBLIC )
17                                         md = src.match( PUBLIC, true )
18                                         @middle = "PUBLIC"
19                                         @content = "#{md[2]} #{md[4]}"
20                                 elsif src.match( SYSTEM )
21                                         md = src.match( SYSTEM, true )
22                                         @middle = "SYSTEM"
23                                         @content = md[2]
24                                 elsif src.match( PLAIN )
25                                         md = src.match( PLAIN, true )
26                                         @middle = ""
27                                         @content = md[2]
28                                 elsif src.match( PERCENT )
29                                         md = src.match( PERCENT, true )
30                                         @middle = ""
31                                         @content = md[2]
32                                 end
33                                 raise ParseException.new("failed Entity match", src) if md.nil?
34                                 @name = md[1]
35                         end
36
37                         def to_s
38                                 rv = "<!ENTITY #@name "
39                                 rv << "#@middle " if @middle.size > 0
40                                 rv << @content
41                                 rv
42                         end
43
44                         def write( output, indent )
45         indent( output, indent )
46                                 output << to_s
47                         end
48
49                         def EntityDecl.parse_source source, listener
50                                 md = source.match( PATTERN_RE, true )
51                                 thing = md[0].squeeze(" \t\n\r")
52                                 listener.send inspect.downcase, thing 
53                         end
54                 end
55         end
56 end