Parse a PDF document with ruby

问题:

I have multiple PDF documents in a folder that have a certain structure:

Now I want to be able to parse the information from the PDF. Please note that the paragraphs have varying lengths.

Obviously I am not asking you to solve the problem for me, but I do need some pointers as to how this can be achieved.

I have used nokogiri before and technically I need something like that but for PDFs.

So the pseudo result for my example would look like this:

- ItemA
  - Title: ItemA
  - File: 123456789.pdf
  - Image: ImageA.png (the image was stored on disk)
  - Subtitle1: Content for subtitle 1
  - Subtitle2: Content for subtitle 2
  - Subtitle3: Content for subtitle 3
- TitleB
  - [...]

回答1:

pdf-reader is one of the solution. But it has issues sometimes it doesn't give text in proper format. I have used it.

I will suggest to use docsplit . You will find more information about 'pdf-reader' and 'docsplit' in this blog post.

Hope this helps. In case any clarification is required, feel free to comment.

回答2:

Getting the text

The text can easily be parsed like so:

# gem install pdf-reader
require 'pdf-reader'

reader = PDF::Reader.new('my.pdf')

reader.pages.each do |page|
  puts page.text
end

Saving the image

This can be done with the same library. See the example script examples/extract_images.rb.

However

This is (not yet) a complete answer. The next steps would now be to:

1. Parse the text and look for the headings
2. Crop the image, which can be achieved with a library like RMagick or Mini Magick.