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RSpec PDF content matcher
module PDF
class Loader
def self.content_for(body)
temp_pdf = Tempfile.new('pdf')
temp_pdf << body.force_encoding('UTF-8')
temp_pdf.close
receiver = PDF::SimplePageTextReceiver.new
PDF::Reader.file(temp_pdf.path, receiver)
receiver.content
end
end
class SimplePageTextReceiver
attr_accessor :content
def initialize
@content = []
end
# Called when page parsing starts
def begin_page(arg = nil)
@content << ""
end
# record text that is drawn on the page
def show_text(string, *params)
@content.last << string.strip
end
# there's a few text callbacks, so make sure we process them all
alias :super_show_text :show_text
alias :move_to_next_line_and_show_text :show_text
alias :set_spacing_next_line_show_text :show_text
# this final text callback takes slightly different arguments
def show_text_with_positioning(*params)
params = params.first
params.each { |str| show_text(str) if str.kind_of?(String)}
end
end
end
RSpec::Matchers.define :have_pdf_content do |text|
match do |body|
PDF::Loader.content_for(body).join == text.gsub(/ /, '')
end
failure_message_for_should do |body|
"pdf should have content:\n'#{text}'"
end
failure_message_for_should_not do |body|
"pdf should not have content:\n'#{text}'"
end
end
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