Construct 1.10 released

[tomerfiliba at gmail.com]

what's Construct
----------------------------
a library for parsing and building of data structures, at the
bit-level, in a declarative manner (no procedural code needed).

site
----------------------------
get it at http://pyconstruct.sourceforge.net

what' news
----------------------------
* two bug fixes: forgot to define two exception classes
* new builtins:
    - Pass - a "do nothing" construct, useful for the default arguments
to Switch, etc.
    - If - a conditional construct, that executes the sub-construct
only if some meta-condition is satisfied
    - Embed - embeds a Struct into another Struct. see example below.
    - LazyBind - lazy-binds a construct, so you can be define recursive
constructs. see example.
    - Float - IEEE754 floating point implementation. this release only
supports parsing of floats, not building them, but i thought its useful
enough by itself. a later release will address the building problem.
* improved the LV construct
* removed the TLV construct (it's pointless to have it as a builtin)
* added get_size() which returns the size of a 'normal' (non-meta)
construct,

example
----------------------------
to_embed = Struct("blah",
	UInt8("a"),
	UInt8("b"),
	UInt8("c"),
)
struct1 = Struct("struct1",
	to_embed,
	UInt8("x"),
)
struct2 = Struct("struct2",
	Embed(to_embed),
	UInt8("x"),
)

#>>> print struct1.parse("xabc")
#Container:
#    blah = Container:
#        a = 120
#        b = 97
#        c = 98
#    x = 99
#>>> print struct2.parse("xabc")
#Container:
#    a = 120
#    b = 97
#    c = 98
#    x = 99
#>>> print struct1.get_size()
#32
#>>> print struct2.get_size()
#32

my_linked_list = Struct("linked_list",
	UInt8("data"),
	UInt8("has_next"),
	If("_.has_next",
		LazyBind("next", "my_linked_list", globals())
	)
)

#>>> print my_linked_list.parse("A\x01B\x01C\x01D\x00")
#Container:
#    data = 65
#    has_next = 1
#    next = Container:
#        data = 66
#        has_next = 1
#        next = Container:
#            data = 67
#            has_next = 1
#            next = Container:
#                data = 68
#                has_next = 0
#                next = None


-tomer