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require 'ffi_yajl/ffi'
module FFI_Yajl
module FFI
module Parser
def set_value(val)
case stack.last
when Hash
raise FFI_Yajl::ParseError.new("internal error: missing key in parse") if key.nil?
stack.last[key] = val
when Array
stack.last.push(val)
else
raise FFI_Yajl::ParseError.new("internal error: object not a hash or array")
end
end
def stack_pop
if stack.length > 1
set_value( stack.pop )
else
@finished = stack.pop
end
end
def key_push
key_stack.push(key)
end
def key_pop
@key = key_stack.pop()
end
def setup_callbacks
@null_callback = ::FFI::Function.new(:int, [:pointer]) do |ctx|
set_value(nil)
1
end
@boolean_callback = ::FFI::Function.new(:int, [:pointer, :int]) do |ctx, boolval|
set_value(boolval == 1 ? true : false)
1
end
@integer_callback = ::FFI::Function.new(:int, [:pointer, :long_long]) do |ctx, intval|
set_value(intval)
1
end
@number_callback = ::FFI::Function.new(:int, [:pointer, :string, :size_t ]) do |ctx, stringval, stringlen|
s = stringval.slice(0,stringlen)
s.force_encoding('UTF-8') if defined? Encoding
# XXX: I can't think of a better way to do this right now. need to call to_f if and only if its a float.
v = ( s =~ /\./ ) ? s.to_f : s.to_i
set_value(v)
1
end
@double_callback = ::FFI::Function.new(:int, [:pointer, :double]) do |ctx, doubleval|
set_value(doubleval)
1
end
@string_callback = ::FFI::Function.new(:int, [:pointer, :string, :size_t]) do |ctx, stringval, stringlen|
s = stringval.slice(0,stringlen)
s.force_encoding('UTF-8') if defined? Encoding
set_value(s)
1
end
@start_map_callback = ::FFI::Function.new(:int, [:pointer]) do |ctx|
key_push # for key => { } case, save the key
stack.push(Hash.new)
1
end
@map_key_callback = ::FFI::Function.new(:int, [:pointer, :string, :size_t]) do |ctx, key, keylen|
s = key.slice(0,keylen)
s.force_encoding('UTF-8') if defined? Encoding
self.key = s
1
end
@end_map_callback = ::FFI::Function.new(:int, [:pointer]) do |ctx|
key_pop
stack_pop
1
end
@start_array_callback = ::FFI::Function.new(:int, [:pointer]) do |ctx|
key_push # for key => [ ] case, save the key
stack.push(Array.new)
1
end
@end_array_callback = ::FFI::Function.new(:int, [:pointer]) do |ctx|
key_pop
stack_pop
1
end
end
def do_yajl_parse(str, opts = {})
setup_callbacks
callback_ptr = ::FFI::MemoryPointer.new(::FFI_Yajl::YajlCallbacks)
callbacks = ::FFI_Yajl::YajlCallbacks.new(callback_ptr)
callbacks[:yajl_null] = @null_callback
callbacks[:yajl_boolean] = @boolean_callback
callbacks[:yajl_integer] = @integer_callback
callbacks[:yajl_double] = @double_callback
callbacks[:yajl_number] = @number_callback
callbacks[:yajl_string] = @string_callback
callbacks[:yajl_start_map] = @start_map_callback
callbacks[:yajl_map_key] = @map_key_callback
callbacks[:yajl_end_map] = @end_map_callback
callbacks[:yajl_start_array] = @start_array_callback
callbacks[:yajl_end_array] = @end_array_callback
yajl_handle = ::FFI_Yajl.yajl_alloc(callback_ptr, nil, nil)
if ( stat = ::FFI_Yajl.yajl_parse(yajl_handle, str, str.bytesize) != :yajl_status_ok )
# FIXME: dup the error and call yajl_free_error?
error = ::FFI_Yajl.yajl_get_error(yajl_handle, 1, str, str.bytesize)
raise ::FFI_Yajl::ParseError.new(error)
end
if ( stat = FFI_Yajl.yajl_complete_parse(yajl_handle) != :yajl_status_ok )
# FIXME: dup the error and call yajl_free_error?
error = ::FFI_Yajl.yajl_get_error(yajl_handle, 1, str, str.bytesize)
raise ::FFI_Yajl::ParseError.new(error)
end
finished
ensure
::FFI_Yajl.yajl_free(yajl_handle) if yajl_handle
end
end
end
end
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