moving encoder class to its own file

1 files changed, 137 insertions, 0 deletions

diff --git a/lib/ffi_yajl/encoder.rb b/lib/ffi_yajl/encoder.rb
new file mode 100644
index 0000000..2e79577
--- /dev/null
+++ b/lib/ffi_yajl/encoder.rb
@@ -0,0 +1,137 @@
+
+module FFI_Yajl
+  class Encoder
+    attr_accessor :opts
+
+    def self.encode(obj, *args)
+      new(*args).encode(obj)
+    end
+
+    def initialize(opts = {})
+      @opts = opts
+    end
+
+    def encode(obj)
+      yajl_gen = FFI_Yajl.yajl_gen_alloc(nil, 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
+
+
+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
+