Class: Gdt::Parser

Inherits:

Object

• Object
• Gdt::Parser

Defined in:

lib/gdt/parser.rb

Class Method Summary

• .parse(string) ⇒ Object

Class Method Details

.parse(string) ⇒ Object

# File 'lib/gdt/parser.rb', line 8

def self.parse(string)
  # canonical line endings
  string.gsub!("\r\n","\n")
  
  string.split(/\n/).
  # ignore empty lines and lines consisting only of whitespace
  delete_if { |line| line =~ /^\s*$/ }.
  inject({}) do |h, line|
    # parse the line into tokens
    #
    length, type, data = line.scan(/(\d{3})(\d{4})(.*)/).first

    raise ParseError, "line does not match expected GDT format: '#{line}'" unless length && type && data
    
    length = length.to_i
    type = type.to_i

    # 3 bytes length + 4 bytes record id + data length (bytes) + CR LF
    expected_length = 3 + 4 + data.length + 2
    
    raise ParseError, "wrong length in GDT data: '#{line}'" unless length == expected_length

    h[type] = data
    h
  end
end