Hessian 2.0 Grammar

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Draft Grammar of Hessian 1.1
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[[Category:Hessian]]
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Draft Grammar of Hessian 2.0.  Notes and explanation are at [[Hessian 2.0]].  The spec development process has just begun.
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The following is the complete grammar for Hessian 2.0.  All integers are big-endian, i.e. starting with the most-significant byte first.
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top    ::= call
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        ::= reply
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call    ::= c x02 x00 header* method object* z
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reply  ::= r x02 x00 header* object z
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        ::= r x02 x00 header* fault z
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object  ::= null
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        ::= boolean
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        ::= int
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        ::= long
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        ::= double
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        ::= date
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        ::= string
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        ::= xml
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        ::= binary
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        ::= remote
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        ::= ref
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        ::= list
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        ::= map
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        ::= class
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        ::= instance
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header  ::= H b1 b0 header-string object
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method  ::= m b1 b0 method-string
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fault  ::= f (object object)*
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list    ::= V type? length? object* z
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        ::= [x10 - x1f] <int> object*
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map    ::= M type? (object object)* z
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remote  ::= r type? string
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type    ::= t b1 b0 type-string
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        ::= T <int>
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length  ::= l b3 b2 b1 b0
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        ::= x0f b0
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null    ::= N
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boolean ::= T
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        ::= F
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int    ::= I b3 b2 b1 b0
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        ::= [x80 - 0xcf]
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        ::= x01 b0
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        ::= x02 b1 b0
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long    ::= L b7 b6 b5 b4 b3 b2 b1 b0
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        ::= [x20 - x3f]
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        ::= x03 b0
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        ::= x04 b1 b0
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        ::= x05 b3 b2 b1 b0
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double  ::= D b7 b6 b5 b4 b3 b2 b1 b0
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        ::= x06
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        ::= x07
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        ::= x08 b0
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        ::= x09 b1 b0
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        ::= x0b b3 b2 b1 b0
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        ::= x0c b1 b0
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        ::= x0e b3 b2 b1 b0
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date    ::= d b7 b6 b5 b4 b3 b2 b1 b0
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string  ::= (s b1 b0 string-data)* S b1 b0 string-data
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        ::= [xd0 - xef] string-data
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xml    ::= (x b1 b0 xml-data)* X b1 b0 xml-data
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binary  ::= (b b1 b0 binary-data)* B b1 b0 binary-data
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        ::= [xf0 - xff] binary-data
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ref    ::= R b3 b2 b1 b0
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        ::= x5b b0
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        ::= x5c b1 b1
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class    ::= O int string-data int string* object*
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instance ::= o int object*

Latest revision as of 20:50, 23 June 2006


Draft Grammar of Hessian 2.0. Notes and explanation are at Hessian 2.0. The spec development process has just begun.

The following is the complete grammar for Hessian 2.0. All integers are big-endian, i.e. starting with the most-significant byte first.

top     ::= call
        ::= reply

call    ::= c x02 x00 header* method object* z

reply   ::= r x02 x00 header* object z
        ::= r x02 x00 header* fault z

object  ::= null
        ::= boolean
        ::= int
        ::= long
        ::= double
        ::= date
        ::= string
        ::= xml
        ::= binary
        ::= remote
        ::= ref
        ::= list
        ::= map
        ::= class
        ::= instance

header  ::= H b1 b0 header-string object
method  ::= m b1 b0 method-string

fault   ::= f (object object)*

list    ::= V type? length? object* z
        ::= [x10 - x1f] <int> object*

map     ::= M type? (object object)* z

remote  ::= r type? string
 
type    ::= t b1 b0 type-string
        ::= T <int>

length  ::= l b3 b2 b1 b0
        ::= x0f b0

null    ::= N

boolean ::= T
        ::= F

int     ::= I b3 b2 b1 b0
        ::= [x80 - 0xcf]
        ::= x01 b0
        ::= x02 b1 b0

long    ::= L b7 b6 b5 b4 b3 b2 b1 b0
        ::= [x20 - x3f]
        ::= x03 b0
        ::= x04 b1 b0
        ::= x05 b3 b2 b1 b0

double  ::= D b7 b6 b5 b4 b3 b2 b1 b0
        ::= x06
        ::= x07
        ::= x08 b0
        ::= x09 b1 b0
        ::= x0b b3 b2 b1 b0
        ::= x0c b1 b0
        ::= x0e b3 b2 b1 b0

date    ::= d b7 b6 b5 b4 b3 b2 b1 b0

string  ::= (s b1 b0 string-data)* S b1 b0 string-data
        ::= [xd0 - xef] string-data

xml     ::= (x b1 b0 xml-data)* X b1 b0 xml-data

binary  ::= (b b1 b0 binary-data)* B b1 b0 binary-data
        ::= [xf0 - xff] binary-data 

ref     ::= R b3 b2 b1 b0
        ::= x5b b0
        ::= x5c b1 b1

class    ::= O int string-data int string* object*

instance ::= o int object*
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