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97 lines
2.1 KiB
97 lines
2.1 KiB
# frozen_string_literal: true
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class PdfProcessor < HexaPDF::Content::Processor
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attr_accessor :handler, :serializer
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class ParseTextHandler
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attr_accessor :pos, :num, :search_chars, :handler
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def initialize(handler)
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@num = 0
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@pos = 0
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@handler = handler
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@search_chars = handler.search_chars
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end
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TJS = %i[TJ Tj].freeze
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def call(processor, operator, operands)
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return unless TJS.include?(operator)
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processor.send(:decode_text, *operands).chars.each do |char|
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handler.tokens << [char, [@num, @pos]] if search_chars.include?(char)
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@pos += 1
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end
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@pos = 0
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@num += 1
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rescue HexaPDF::Error => e
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Rails.logger.error(e.message)
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@pos = 0
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@num += 1
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end
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end
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def initialize(page)
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super
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@serializer = HexaPDF::Serializer.new
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end
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def serialize(operator, operands)
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operators[operator].serialize(serializer, *operands)
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end
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def process(operator, operands = [])
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super
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handler.call(self, operator, operands)
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end
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def self.call(data, process_handler, result_handler, acc = {})
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doc = HexaPDF::Document.new(io: StringIO.new(data))
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doc.pages.each do |page|
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processor = PdfProcessor.new(page)
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process_handler_instance = process_handler.new
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processor.handler = ParseTextHandler.new(process_handler_instance)
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page.process_contents(processor)
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if process_handler_instance.tokens?
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processor = PdfProcessor.new(page)
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processor.handler = process_handler_instance
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page.process_contents(processor)
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page.contents = process_handler_instance.contents
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end
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page[:Annots].to_a.each do |annot|
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next unless annot
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text = annot[:Contents].to_s.squish
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next unless text.starts_with?('{{') && text.ends_with?('}}')
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result_handler.call({ text:, rect: annot[:Rect] }, page, acc)
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page[:Annots].delete(annot)
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end
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process_handler_instance.result.each do |item|
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result_handler.call(item, page, acc)
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end
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end
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new_io = StringIO.new
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doc.write(new_io, validate: false)
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[new_io.tap(&:rewind).read, acc]
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end
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end
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