Class: Gemtext::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/gemtext/parser.rb

Instance Method Summary collapse

Constructor Details

#initialize(io) ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/gemtext/parser.rb', line 5

def initialize(io)
  @io = io
  @document = Document.new
  @preformatted = false
end

Instance Method Details

#parse ⇒ Object 



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# File 'lib/gemtext/parser.rb', line 11

def parse
  @io.each do |line|
    # Always strip lines to handle "\r\n"
    stripped = line.strip

    # First check if we're toggling preformatted mode
    if stripped =~ /^```/
      if @preformatted
        # Closing out the preformatted text
        @preformatted.content.delete_suffix!("\n") # Remove the extra newline from the last line
        @document.push @preformatted
        @preformatted = false
      elsif stripped == '```'
        # Starting preformatted text without caption
        @preformatted = Preformatted[""]
      else
        # Starting preformatted text with caption
        @preformatted = Preformatted["", stripped.delete_prefix('```').strip]
      end
      next
    end

    # Once we're in a preformatted block add to the block until we
    # break out of it
    if @preformatted
      @preformatted.content << line
      next
    end

    @document.push(
      case stripped
      when /^#\s+/
        Heading[stripped.delete_prefix('#').strip]
      when /^##\s+/
        SubHeading[stripped.delete_prefix('##').strip]
      when /^###\s+/
        SubSubHeading[stripped.delete_prefix('###').strip]
      when ""
        Whitespace[nil]
      when /^=>/
        without_arrow = stripped.delete_prefix('=>').strip
        pieces = without_arrow.split(/\s+/)
        url = pieces.first
        description = pieces.drop(1).join ' ' # TODO: Preserve whitespace in description

        Link[url, description]
      when /^\*\s/
        ListItem[stripped.delete_prefix('*').strip]
      when /^>/
        Quote[stripped.delete_prefix('>').strip]
      else
        Text[line.strip]
      end
    )
  end
@document.dup
end