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require 'ffi'
# FIXME: should require the lower level ffi stuff here instead of having this included higher up
module FFI_Yajl
module FFI
module Encoder
def encode(obj)
yajl_gen = FFI_Yajl.yajl_gen_alloc(nil);
# configure the yajl encoder
FFI_Yajl.yajl_gen_config(yajl_gen, :yajl_gen_beautify, :int, 1) if opts[:pretty]
FFI_Yajl.yajl_gen_config(yajl_gen, :yajl_gen_validate_utf8, :int, 1)
indent = if opts[:pretty]
opts[:indent] ? opts[:indent] : " "
else
" "
end
FFI_Yajl.yajl_gen_config(yajl_gen, :yajl_gen_indent_string, :string, indent)
# setup our own state
state = {
:json_opts => opts,
:processing_key => false,
}
# do the encoding
obj.ffi_yajl(yajl_gen, state)
# get back our encoded JSON
string_ptr = ::FFI::MemoryPointer.new(:string)
length_ptr = ::FFI::MemoryPointer.new(:int)
FFI_Yajl.yajl_gen_get_buf(yajl_gen, string_ptr, length_ptr)
length = length_ptr.read_int
string = string_ptr.get_pointer(0).read_string
return string
ensure
# free up the yajl encoder
FFI_Yajl.yajl_gen_free(yajl_gen)
end
end
end
end
class Hash
def ffi_yajl(yajl_gen, state)
FFI_Yajl.yajl_gen_map_open(yajl_gen)
self.each do |key, value|
# Perf Fix: mutate state hash rather than creating new copy
state[:processing_key] = true
key.ffi_yajl(yajl_gen, state)
state[:processing_key] = false
value.ffi_yajl(yajl_gen, state)
end
FFI_Yajl.yajl_gen_map_close(yajl_gen)
end
end
class Array
def ffi_yajl(yajl_gen, state)
FFI_Yajl.yajl_gen_array_open(yajl_gen)
self.each do |value|
value.ffi_yajl(yajl_gen, state)
end
FFI_Yajl.yajl_gen_array_close(yajl_gen)
end
end
class NilClass
def ffi_yajl(yajl_gen, state)
FFI_Yajl.yajl_gen_null(yajl_gen)
end
end
class TrueClass
def ffi_yajl(yajl_gen, state)
FFI_Yajl.yajl_gen_bool(yajl_gen, 0)
end
end
class FalseClass
def ffi_yajl(yajl_gen, state)
FFI_Yajl.yajl_gen_bool(yajl_gen, 1)
end
end
class Fixnum
def ffi_yajl(yajl_gen, state)
if state[:processing_key]
str = self.to_s
FFI_Yajl.yajl_gen_string(yajl_gen, str, str.length)
else
FFI_Yajl.yajl_gen_integer(yajl_gen, self)
end
end
end
class Bignum
def ffi_yajl(yajl_gen, state)
raise NotImpelementedError
end
end
class Float
def ffi_yajl(yajl_gen, state)
FFI_Yajl.yajl_gen_double(yajl_gen, self)
end
end
class String
def ffi_yajl(yajl_gen, state)
FFI_Yajl.yajl_gen_string(yajl_gen, self, self.length)
end
end
# I feel dirty
class Object
unless defined?(ActiveSupport)
def to_json(*args, &block)
"\"#{to_s}\""
end
end
def ffi_yajl(yajl_gen, state)
json = self.to_json(state[:json_opts])
FFI_Yajl.yajl_gen_number(yajl_gen, json, json.length)
end
end
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