undefined method `[]' for nil:NilClass

[justindarc]

I have encountered a simple 1-page PDF generated by OpenOffice that causes the pdf-reader gem to throw an error when extracting text. The error occurs in the "int_to_name" method on line 127 of lib/pdf/reader/encoding.rb. The reason for the error is that @differences is nil.

Here is the error:

undefined method []' for nil:NilClass /Users/Justin/.rvm/gems/jruby-1.7.1/gems/pdf-reader-1.3.1/lib/pdf/reader/encoding.rb:127:inint_to_name'

[yob]

Thanks for the bug report.

Can you generate a sample PDF that triggers this and email it to me at
james@yob.id.au?

[kedarmhaswade]

I see the same error. The glyph_code is 183 and for that when lookup happens @differences is nil.

stack trace:

NoMethodError - undefined method `[]' for nil:NilClass:
    (eval):2:in `method_missing'
    gems/pdf-reader-1.3.1/lib/pdf/reader/encoding.rb:127:in `int_to_name'
    gems/pdf-reader-1.3.1/lib/pdf/reader/width_calculator/built_in.rb:42:in `glyph_width'
    gems/pdf-reader-1.3.1/lib/pdf/reader/font.rb:89:in `glyph_width'
    gems/pdf-reader-1.3.1/lib/pdf/reader/page_text_receiver.rb:107:in `block in internal_show_text'
    gems/pdf-reader-1.3.1/lib/pdf/reader/page_text_receiver.rb:100:in `each'
    gems/pdf-reader-1.3.1/lib/pdf/reader/page_text_receiver.rb:100:in `each_with_index'
    gems/pdf-reader-1.3.1/lib/pdf/reader/page_text_receiver.rb:100:in `internal_show_text'
    gems/pdf-reader-1.3.1/lib/pdf/reader/page_text_receiver.rb:57:in `show_text'
    gems/pdf-reader-1.3.1/lib/pdf/reader/page.rb:154:in `block in callback'
    gems/pdf-reader-1.3.1/lib/pdf/reader/page.rb:153:in `each'
    gems/pdf-reader-1.3.1/lib/pdf/reader/page.rb:153:in `callback'
    gems/pdf-reader-1.3.1/lib/pdf/reader/page.rb:140:in `content_stream'
    gems/pdf-reader-1.3.1/lib/pdf/reader/page.rb:105:in `walk'
    gems/pdf-reader-1.3.1/lib/pdf/reader/page.rb:75:in `text'

James -- I will send you a pdf file separately in an email ...

[yob]

Thanks @kedarmhaswade. I think this bug has been fixed in 1.3.2, can you try upgrading and let me know?

[kedarmhaswade]

Whoa! Thank you, @yob! Upgrading to 1.3.2 parses the file I sent you correctly. I think I agree with you. This bug seems to have been fixed.