tombruijn/kotoba

module Kotoba
  class Template
    include Kotoba::Content

    attr_reader :file, :metadata, :content

    def initialize(file, content)
      @file = file
      @metadata = {}
      @content = content
      extract_metadata
    end

    # Extracts metadata from a file. Metadata should be in the YAML format.
    # Metadata should be at the very start of the file.
    # It removes the metadata from the content that will be parsed.
    #
    # @example Expected format in a file:
    #   ---
    #   key: value
    #   ---
    #
    #   Actual content of the file.
    #
    def extract_metadata
      YAML_METADATA.match(content) do |match|
        @metadata = YAML.load(match[0])
        @content = content.gsub(YAML_METADATA, "")
      end
    end

    # Returns an array of the template's content.
    # When support_sections is on it will split up the content on
    # SECTION_SEPARATOR.
    # Every ___PAGE___ alone on a line should be treated as a new page.
    #
    # @return [Array] array of sections and page breaks
    #
    def source
      strings = self.content.split(PAGE_BREAK_SPLITTER)
      if Kotoba.config.support_sections
        strings.collect! do |string|
          sections = string.split(SECTION_SEPARATOR)
          sections.reject do |section|
            section.empty? || contains_only_line_breaks?(section)
          end
        end.flatten!
      end
      strings
    end
  end
end