Class: Ragdoll::TextChunker

Inherits:
Object
  • Object
show all
Defined in:
app/services/ragdoll/text_chunker.rb

Constant Summary collapse

DEFAULT_CHUNK_SIZE = 
1000
DEFAULT_CHUNK_OVERLAP = 
200

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(text, chunk_size: DEFAULT_CHUNK_SIZE, chunk_overlap: DEFAULT_CHUNK_OVERLAP) ⇒ TextChunker

Returns a new instance of TextChunker.



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# File 'app/services/ragdoll/text_chunker.rb', line 12

def initialize(text, chunk_size: DEFAULT_CHUNK_SIZE, chunk_overlap: DEFAULT_CHUNK_OVERLAP)
  @text = text.to_s
  @chunk_size = chunk_size
  @chunk_overlap = chunk_overlap
end

Class Method Details

.chunk(text, chunk_size: DEFAULT_CHUNK_SIZE, chunk_overlap: DEFAULT_CHUNK_OVERLAP) ⇒ Object 



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# File 'app/services/ragdoll/text_chunker.rb', line 8

def self.chunk(text, chunk_size: DEFAULT_CHUNK_SIZE, chunk_overlap: DEFAULT_CHUNK_OVERLAP)
  new(text, chunk_size: chunk_size, chunk_overlap: chunk_overlap).chunk
end

Instance Method Details

#chunk ⇒ Object 



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# File 'app/services/ragdoll/text_chunker.rb', line 18

def chunk
  return [] if @text.empty?

  # Ensure chunk_size and chunk_overlap are valid integers
  @chunk_size = (@chunk_size || DEFAULT_CHUNK_SIZE).to_i
  @chunk_overlap = (@chunk_overlap || DEFAULT_CHUNK_OVERLAP).to_i

  # Ensure chunk_overlap is not greater than or equal to chunk_size to prevent infinite loops
  @chunk_overlap = [@chunk_size - 1, 0].max if @chunk_overlap >= @chunk_size

  return [@text] if @text.length <= @chunk_size

  chunks = []
  start_pos = 0

  while start_pos < @text.length
    end_pos = start_pos + @chunk_size

    # If this is the last chunk, take everything remaining
    if end_pos >= @text.length
      chunks << @text[start_pos..].strip
      break
    end

    # Try to find a good breaking point (sentence, paragraph, or word boundary)
    chunk_text = @text[start_pos...end_pos]
    break_pos = find_break_position(chunk_text, @text, start_pos, end_pos)

    # Extract the chunk
    actual_end_pos = start_pos + break_pos
    chunk_content = @text[start_pos...actual_end_pos].strip

    chunks << chunk_content unless chunk_content.empty?

    # Move to next chunk with overlap
    next_start_pos = actual_end_pos - @chunk_overlap
    next_start_pos = [next_start_pos, 0].max # Ensure we don't go negative

    # Ensure forward progress - if we're not advancing, force a step forward
    next_start_pos = start_pos + 1 if next_start_pos <= start_pos

    start_pos = next_start_pos
  end

  chunks.reject(&:empty?)
end