Class: MDRubyEval

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

Instance Method Summary collapse

Constructor Details

#initialize(input_path, output_path, environment, indentation, line_length) ⇒ MDRubyEval 



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# File 'lib/md_ruby_eval.rb', line 7

def initialize(input_path, output_path, environment, indentation, line_length)
  @input_path  = input_path
  @output_path = output_path
  @environment = environment
  @output      = ''
  @indentation = indentation
  @line_length = line_length

  @last_id   = 1
  @known_ids = Hash.new { |h, k| h[k] = format('%06x', @last_id += 1) }

  process_file input_path
end

Instance Method Details

#evaluate(code, line) ⇒ Object 



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# File 'lib/md_ruby_eval.rb', line 21

def evaluate(code, line)
  eval(code, @environment, @input_path, line)
end

#process_file(input_path) ⇒ Object 



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# File 'lib/md_ruby_eval.rb', line 76

def process_file(input_path)
  puts "evaluating: #{input_path}"

  input = File.read(input_path)
  parts = input.split(/^(```\w*\n)/)

  # pp parts.map(&:lines)

  code_block = nil
  line_count = 1

  parts.each do |part|
    if part =~ /^```(\w+)$/
      code_block = $1
      @output << part
      line_count += 1
      next
    end

    if part =~ /^```$/
      code_block = nil
      @output << part
      line_count += 1
      next
    end

    if code_block == 'ruby'
      @output << process_ruby(part, line_count)
      line_count += part.lines.size
      next
    end

    @output << part
    line_count += part.lines.size
  end

  puts "writing: #{@output_path}"
  File.write(@output_path, @output)
rescue => ex
  puts "#{ex} (#{ex.class})\n#{ex.backtrace * "\n"}"

end

#process_ruby(part, start_line) ⇒ Object 



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# File 'lib/md_ruby_eval.rb', line 25

def process_ruby(part, start_line)
  lines  = part.lines
  chunks = []
  line   = ''

  while !lines.empty?
    line += lines.shift
    if Pry::Code.complete_expression? line
      chunks << line
      line = ''
    end
  end

  raise unless line.empty?

  chunk_lines = chunks.map { |chunk| [chunk, [chunk.split($/).size, 1].max] }
  line_count  = start_line
  output      = ''
  chunk_lines.each do |chunk, lines|
    result = evaluate(chunk, line_count)
    if chunk.strip.empty? || chunk.include?('#')
      output << (chunk.end_with?("#\n") ? chunk[0..-3] + "\n" : chunk)
    else
      pre_lines = chunk.lines.to_a
      last_line = pre_lines.pop
      output << pre_lines.join

      if last_line =~ /\#$/
        output << last_line.gsub(/\#$/, '')
      else
        inspected_result = stabilize_object_ids result.inspect
        if last_line.size < @indentation && inspected_result.size < @indentation
          output << "%-#{@indentation}s %s" % [last_line.chomp, "# => #{inspected_result}\n"]
        else
          PP.pp result, (buf = ''), @line_length
          buf           = stabilize_object_ids buf
          inspect_lines = buf.lines
          output << last_line << "# => #{inspect_lines[0]}" << inspect_lines[1..-1].map { |l| format '#    %s', l }.join
        end
      end
    end
    line_count += lines
  end
  output
end

#stabilize_object_ids(output) ⇒ Object 



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# File 'lib/md_ruby_eval.rb', line 72

def stabilize_object_ids(output)
  output.gsub(/(#<[\w:_]+0x)([0-9a-f]{16})/) { $1 + @known_ids[$2] }
end