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# coding: utf-8
# typed: strict
# frozen_string_literal: true
# Copyright (C) 2010 James Healy (jimmy@deefa.com)
class PDF::Reader
# An example receiver that just records all callbacks generated by parsing
# a PDF file.
#
# Useful for testing the contents of a file in an rspec/test-unit suite.
#
# Usage:
#
# PDF::Reader.open("somefile.pdf") do |reader|
# receiver = PDF::Reader::RegisterReceiver.new
# reader.page(1).walk(receiver)
# callback = receiver.first_occurance_of(:show_text)
# callback[:args].first.should == "Hellow World"
# end
#
class RegisterReceiver
#: Array[Hash[Symbol, untyped]]
attr_accessor :callbacks
#: () -> void
def initialize
@callbacks = [] #: Array[Hash[Symbol, untyped]]
end
#: (untyped) -> bool
def respond_to?(meth)
true
end
#: (Symbol, *untyped) -> void
def method_missing(methodname, *args)
callbacks << {:name => methodname.to_sym, :args => args}
end
# count the number of times a callback fired
#: (Symbol) -> Integer
def count(methodname)
callbacks.count { |cb| cb[:name] == methodname}
end
# return the details for every time the specified callback was fired
#: (Symbol) -> Array[Hash[Symbol, untyped]]
def all(methodname)
callbacks.select { |cb| cb[:name] == methodname }
end
#: (Symbol) -> Array[Array[untyped]]
def all_args(methodname)
all(methodname).map { |cb| cb[:args] }
end
# return the details for the first time the specified callback was fired
#: (Symbol) -> Hash[Symbol, untyped]?
def first_occurance_of(methodname)
callbacks.find { |cb| cb[:name] == methodname }
end
# return the details for the final time the specified callback was fired
#: (Symbol) -> Hash[Symbol, untyped]?
def final_occurance_of(methodname)
all(methodname).last
end
# return the first occurance of a particular series of callbacks
#: (*Symbol) -> Array[Hash[Symbol, untyped]]?
def series(*methods)
return nil if methods.empty?
indexes = (0..(callbacks.size-1))
method_indexes = (0..(methods.size-1))
indexes.each do |idx|
count = methods.size
method_indexes.each do |midx|
res = callbacks[idx+midx]
if res && res[:name] == methods[midx]
count -= 1
end
end
if count == 0
return callbacks[idx, methods.size]
end
end
nil
end
end
end
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