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# encoding: utf-8
# Copyright (C) 2009-2013 MongoDB, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
module BSON
module Grow
# module with methods to grow BSON docs/objects/arrays
# this module is intended for internal use and is subject to change
# proper usage is essential as minimal overhead is preferred over usage checks
# unfinish! returns unfinished BSON for faster growing with bang! methods
# bang! methods work on unfinished BSON with neither terminating nulls nor proper sizes
# finish! must be called to finish BSON after using bang! methods
# corresponding non-bang methods work on finished BSON
# object/array methods should be paired, ex., array!/b_end! and array/b_end
# push!/push and push_doc!/push_doc append to arrays with correct keys
# b_end needs a better name
def to_e # Extract bytes for elements from BSON
@str[4...-1]
end
def to_t # Extract type from (single-element) BSON
@str[4,1]
end
def to_v # Extract value from (single-element) BSON
@str[(@str.index(NULL_BYTE,5)+1)...-1]
end
def finish_one!(offset = 0) # Appends terminating null byte and sets size
put(0)
put_int(@str.size - offset, offset)
@cursor = @str.size
self
end
def unfinish! # Backup past terminating null bytes
@b_pos ||= [0]
@cursor = @str.size - @b_pos.size # BSON::BSON_CODER.serialize may not restore @cursor
self
end
def finish! # Append all terminating null bytes and set all sizes
@b_pos ||= [0]
(@b_pos.size-1).downto(0){|i| finish_one!(@b_pos[i])}
self
end
def grow!(bson) # Appends BSON elements unfinished
put_binary(bson.to_e)
self
end
def grow(bson) # Appends BSON elements finished
@b_pos ||= [0]
put_binary(bson.to_e, @str.size - @b_pos.size)
finish!
end
def push!(bson) # Appends BSON element value with correct key unfinished
@a_index ||= [0]
@b_pos ||= [0]
put_binary(bson.to_t)
put_binary(@a_index[-1].to_s)
put_binary(NULL_BYTE)
@a_index[-1] += 1
put_binary(bson.to_v)
self
end
def push(bson) # Appends BSON element value with correct key finished
@a_index ||= [0]
@b_pos ||= [0]
put_binary(bson.to_t, @str.size - @b_pos.size)
put_binary(@a_index[-1].to_s)
put_binary(NULL_BYTE)
@a_index[-1] += 1
put_binary(bson.to_v)
finish!
end
def push_doc!(bson) # Appends BSON doc with correct key unfinished
@a_index ||= [0]
@b_pos ||= [0]
put(BSON::BSON_RUBY::OBJECT)
put_binary(@a_index[-1].to_s)
put(0)
@a_index[-1] += 1
put_binary(bson.to_s)
self
end
def push_doc(bson) # Appends BSON doc with correct key finished
@a_index ||= [0]
@b_pos ||= [0]
put(BSON::BSON_RUBY::OBJECT, @str.size - @b_pos.size)
put_binary(@a_index[-1].to_s)
put(0)
@a_index[-1] += 1
put_binary(bson.to_s)
finish!
end
def b_do!(key, type = BSON::BSON_RUBY::OBJECT) # Append object/array element unfinished
put(type)
BSON::BSON_RUBY.serialize_cstr(self, key)
@b_pos ||= [0]
@a_index ||= [0]
@b_pos << @cursor # mark position of size
@a_index << 0
put_int(0)
self
end
def b_do(key, type = BSON::BSON_RUBY::OBJECT) # Append object/array element finished
@b_pos ||= [0]
@cursor = @str.size - @b_pos.size
b_do!(key, type)
finish!
end
def doc!(key) # Append object element unfinished
b_do!(key, BSON::BSON_RUBY::OBJECT)
end
def doc(key) # Append object element finished
b_do(key, BSON::BSON_RUBY::OBJECT)
end
def array!(key) # Append array element unfinished
b_do!(key, BSON::BSON_RUBY::ARRAY)
end
def array(key) # Append array element finished
b_do(key, BSON::BSON_RUBY::ARRAY)
end
def b_end! # End object/array unfinished - next operation will be up one level
@b_pos ||= [0]
finish_one!(@b_pos[-1])
@b_pos.pop
@a_index ||= [0]
@a_index.pop
self
end
def b_end # End object/array finished - next operation will be up one level
@b_pos ||= [0]
@b_pos.pop
@a_index ||= [0]
@a_index.pop
self
end
def clear! # Clear internal state for reuse
@b_pos = @a_index = nil
self
end
end
end
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