| Class | X12::Parser |
| In: |
lib/X12/Parser.rb
|
| Parent: | Object |
$Id: Parser.rb 35 2008-11-13 18:33:44Z ikk $
Main class for creating X12 parsers and factories.
Creates a parser out of a definition
# File lib/X12/Parser.rb, line 33
33: def initialize(file_name)
34: str = File.open(file_name, 'r').read
35: treetop_parser = X12::X12syntaxParser.new
36: res = treetop_parser.parse(str)
37: throw Exception.new("Cannot parse X12 definition in #{file_name}") unless res
38: @x12_definition = res.get
39:
40: # Populate fields in all segments found in all the loops
41: @x12_definition[X12::Loop].each_pair{|k, v|
42: #puts "Processing loop #{k}"
43: process_loop(v)
44: }
45: # @x12_definition.keys.each{|t|
46: # puts "**** #{t}"
47:
48: # case
49: # when t==X12::Segment: @x12_definition[t].each{|i| puts i.inspect; puts i.regexp.source}
50: # when t==X12::Loop: @x12_definition[t].each{|i| puts i.inspect.gsub(/\\*\"/, '"') ; puts i.regexp.source}
51: # else
52: # puts @x12_definition[t].inspect
53: # end
54: # puts "\n\n"
55: # }
56:
57: end
Make an empty loop to be filled out with information
# File lib/X12/Parser.rb, line 69
69: def factory(loop_name)
70: loop = @x12_definition[X12::Loop][loop_name]
71: throw Exception.new("Cannot find a definition for loop #{loop_name}") unless loop
72: loop = loop.dup
73: return loop
74: end
Parse a loop of a given name out of a string. Throws an exception if the loop name is not defined.
# File lib/X12/Parser.rb, line 60
60: def parse(loop_name, str)
61: loop = @x12_definition[X12::Loop][loop_name]
62: throw Exception.new("Cannot find a definition for loop #{loop_name}") unless loop
63: loop = loop.dup
64: loop.parse(str)
65: return loop
66: end
Recursively scan the loop and instantiate fields’ definitions for all its segments
# File lib/X12/Parser.rb, line 78
78: def process_loop(loop)
79: loop.nodes.each{|i|
80: case i
81: when X12::Loop: process_loop(i)
82: when X12::Segment: process_segment(i)
83: else return
84: end
85: }
86: end
Instantiate segment‘s fields as previously defined
# File lib/X12/Parser.rb, line 89
89: def process_segment(segment)
90: segment_definition = @x12_definition[X12::Segment][segment.name]
91: return unless segment_definition
92: segment_definition.nodes.each_index{|i|
93: segment.nodes[i] = segment_definition.nodes[i]
94: }
95: end