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Contents
module IMW
module Formats
# Defines methods for parsing and generating PDF.
#
# Uses PDF::Reader for parsing and Prawn for generating.
module Pdf
# Return a snippet of text from this PDF.
#
# @return [String]
def snippet
begin
require 'pdf/reader'
snippetizer = Snippetizer.new
PDF::Reader.file(path, snippetizer)
snippetizer.snippet
rescue Snippetizer::SnippetEndError
snippetizer.snippet
rescue
''
end
end
# A receiver class used by PDF::Reader which agglomerates text
# up to 1024 bytes and then bails.
class Snippetizer
# A custom error class that can be thrown while receiving text
# from PDF::Reader to cut-short walking large PDF documents.
SnippetEndError = Class.new(IMW::Error)
# The snippet being built by this snippetizer.
attr_accessor :snippet
def initialize
@snippet = ''
end
# Agglomerates text from PDF::Reader up to a fixed size of
# 1024 bytes.
#
# Will convert a single-space line from PDF::Reader as a
# newline character.
#
# FIXME How does the receiver ask PDF::Reader to abort walking
# the document now that enough text has been returned? Till a
# more graceful way is found this method simply raises an
# error, creating a GOTO...
def show_text *params
params.each do |string|
if @snippet.size < 1024
if string == ' '
@snippet += "\n"
else
@snippet += string[0..1024]
end
else
raise SnippetEndError.new
end
end
end
alias_method :show_text_with_positioning, :show_text
alias_method :move_to_next_line_and_show_text, :show_text
alias_method :set_spacing_next_line_show_text, :show_text
end
end
end
end
Version data entries
11 entries across 11 versions & 1 rubygems