Class: PDFBlockExtractor

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

Class Method Summary collapse

Class Method Details

.extract_blocks(reader) ⇒ Object 



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# File 'lib/udise_school_report_reader/pdf_block_extractor.rb', line 2

def self.extract_blocks(reader)
  blocks = []

  reader.pages.each_with_index do |page, index|
    page_number = index + 1
    current_block = {}

    page.raw_content.each_line do |line|
      if line.include?('BT')
        current_block = {
          page: page_number,
          start_line: line.strip,
          text: []  # Initialize as array to collect multiple text blocks
        }
      elsif line.match?(/1\s+0\s+0\s+1\s+(\d+\.?\d*)\s+(\d+\.?\d*)\s+Tm/)
        # Only set coordinates if not already set
        unless current_block[:x] && current_block[:y]
          matches = line.match(/1\s+0\s+0\s+1\s+(\d+\.?\d*)\s+(\d+\.?\d*)\s+Tm/)
          current_block[:x] = matches[1].to_f
          current_block[:y] = matches[2].to_f
        end
      elsif line.match?(/\/F(\d+)\s+(\d+(\.\d+)?)\s+Tf/)
        # Only set font if not already set
        unless current_block[:font] && current_block[:font_size]
          matches = line.match(/\/F(\d+)\s+(\d+(\.\d+)?)\s+Tf/)
          current_block[:font] = "F#{matches[1]}"
          current_block[:font_size] = matches[2].to_f
        end
      elsif line.match?(/\((.*?)\)\s*Tj/)
        # Collect all text blocks, remove escape characters
        text = line.match(/\((.*?)\)\s*Tj/)[1]
        text = text.gsub(/\\/, '') # Remove escape characters
        current_block[:text] << text
      elsif line.include?('ET')
        current_block[:end_line] = line.strip
        # Join all text blocks with space
        current_block[:text] = current_block[:text].join(' ')
        # Only add non-empty blocks with coordinates
        if !current_block[:text].empty? && current_block[:x] && current_block[:y]
          blocks << current_block.dup
        end
      end
    end
  end

  blocks
end