class Opal::BuilderProcessors::Processor

def self.extensions
  @extensions
end

def self.handles(*extensions)
  @extensions = extensions
  matches = extensions.join('|')
  matches = "(#{matches})" if extensions.size == 1
  @match_regexp = Regexp.new "\\.#{matches}#{REGEXP_END}"
end

def self.inherited(processor)
  DEFAULT_PROCESSORS << processor
end

def self.match? other
  (other.is_a?(String) and other.match(match_regexp))
end

def self.match_regexp
  @match_regexp or raise NotImplementedError
end

def initialize(source, filename, options = {})
  @source, @filename, @options = source, filename, options
  @requires = []
  @required_trees = []
end

def mark_as_required(filename)
  "Opal.mark_as_loaded(Opal.normalize_loadable_path(#{filename.to_s.inspect}));"
end

def source_map
  @source_map ||= begin
    mappings = []
    source_file = filename+'.js'
    line = source.count("\n")
    column = source.scan("\n[^\n]*$").size
    offset = ::SourceMap::Offset.new(line, column)
    mappings << ::SourceMap::Mapping.new(source_file, offset, offset)
    # Ensure mappings isn't empty: https://github.com/maccman/sourcemap/issues/11
    unless mappings.any?
      zero_offset = ::SourceMap::Offset.new(0,0)
      mappings = [::SourceMap::Mapping.new(source_file,zero_offset,zero_offset)]
    end
    ::SourceMap::Map.new(mappings)
  end
end

def to_s
  source.to_s
end