lib/lyric_parser.rb

   1 module Lyrix
   2   class LyricParser
   3     attr_reader :lyrics
   4
   5     DEFAULT_OPTIONS = {} unless defined?(DEFAULT_OPTIONS)
   6
   7     def initialize(lyrics, options = {})
   8       @options = DEFAULT_OPTIONS.merge(options)
   9       @lyrics = lyrics
  10     end
  11
  12     def lyrics=(lyrics)
  13       @lyrics = lyrics
  14       @parsed_lyrics = nil
  15     end
  16
  17     def parse
  18       @parsed_lyrics ||= parse!
  19       @parsed_lyrics
  20     end
  21
  22     def parse!
  23       parsed = {}
  24
  25       parsed[:slides] = @lyrics.strip.gsub("\r\n", "\n").split(/\n[ \t]*\n/)
  26       parsed[:slides].collect! { |s| s.strip }
  27       parsed[:slides].reject! { |s| s.empty? }
  28
  29       parsed[:slides].each_with_index do |s,idx|
  30         [:chorus, :bridge].each do |sub|
  31           if s =~ Regexp.new("^\\[#{sub}\\]") and !parsed.has_key?(sub)
  32             parsed[sub] = s.split("\n")[1..-1].join("\n")
  33             parsed[:slides][idx] = parsed[sub]
  34           end
  35
  36           parsed[:slides][idx].gsub!("[#{sub}]", parsed[sub]) if parsed[sub]
  37         end
  38
  39         if s =~ /^\[([2-9])x\]/
  40           parsed[:slides][idx] = (1..($1.to_i)).collect { s.split("\n")[1..-1].join("\n") }
  41         end
  42       end
  43
  44       parsed[:slides].flatten!
  45
  46       parsed[:slides].each_with_index do |s,idx|
  47         slide = parsed[:slides][idx].split("\n")
  48         slide.each_with_index do |line,i|
  49           if line.strip =~ /\[([2-9])x\]$/
  50             num = $1.to_i
  51             line = line.gsub("[#{num}x]", "").strip
  52             slide[i] = (1..num).collect { line }
  53           end
  54         end
  55         parsed[:slides][idx] = slide.flatten.join("\n")
  56       end
  57
  58       parsed
  59     end
  60
  61     def to_slides
  62       parse[:slides]
  63     end
  64   end
  65 end