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SingularityViewer/indra/lib/python/indra/ipc/llmessage.py
2010-04-02 02:48:44 -03:00

373 lines
12 KiB
Python

"""\
@file llmessage.py
@brief Message template parsing and compatiblity
$LicenseInfo:firstyear=2007&license=mit$
Copyright (c) 2007-2009, Linden Research, Inc.
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
$/LicenseInfo$
"""
from compatibility import Incompatible, Older, Newer, Same
from tokenstream import TokenStream
###
### Message Template
###
class Template:
def __init__(self):
self.messages = { }
def addMessage(self, m):
self.messages[m.name] = m
def compatibleWithBase(self, base):
messagenames = (
frozenset(self.messages.keys())
| frozenset(base.messages.keys())
)
compatibility = Same()
for name in messagenames:
selfmessage = self.messages.get(name, None)
basemessage = base.messages.get(name, None)
if not selfmessage:
c = Older("missing message %s, did you mean to deprecate?" % name)
elif not basemessage:
c = Newer("added message %s" % name)
else:
c = selfmessage.compatibleWithBase(basemessage)
c.prefix("in message %s: " % name)
compatibility = compatibility.combine(c)
return compatibility
class Message:
HIGH = "High"
MEDIUM = "Medium"
LOW = "Low"
FIXED = "Fixed"
priorities = [ HIGH, MEDIUM, LOW, FIXED ]
prioritieswithnumber = [ FIXED ]
TRUSTED = "Trusted"
NOTTRUSTED = "NotTrusted"
trusts = [ TRUSTED, NOTTRUSTED ]
UNENCODED = "Unencoded"
ZEROCODED = "Zerocoded"
encodings = [ UNENCODED, ZEROCODED ]
NOTDEPRECATED = "NotDeprecated"
DEPRECATED = "Deprecated"
UDPDEPRECATED = "UDPDeprecated"
UDPBLACKLISTED = "UDPBlackListed"
deprecations = [ NOTDEPRECATED, UDPDEPRECATED, UDPBLACKLISTED, DEPRECATED ]
# in order of increasing deprecation
def __init__(self, name, number, priority, trust, coding):
self.name = name
self.number = number
self.priority = priority
self.trust = trust
self.coding = coding
self.deprecateLevel = 0
self.blocks = [ ]
def deprecated(self):
return self.deprecateLevel != 0
def deprecate(self, deprecation):
self.deprecateLevel = self.deprecations.index(deprecation)
def addBlock(self, block):
self.blocks.append(block)
def compatibleWithBase(self, base):
if self.name != base.name:
# this should never happen in real life because of the
# way Template matches up messages by name
return Incompatible("has different name: %s vs. %s in base"
% (self.name, base.name))
if self.priority != base.priority:
return Incompatible("has different priority: %s vs. %s in base"
% (self.priority, base.priority))
if self.trust != base.trust:
return Incompatible("has different trust: %s vs. %s in base"
% (self.trust, base.trust))
if self.coding != base.coding:
return Incompatible("has different coding: %s vs. %s in base"
% (self.coding, base.coding))
if self.number != base.number:
return Incompatible("has different number: %s vs. %s in base"
% (self.number, base.number))
compatibility = Same()
if self.deprecateLevel != base.deprecateLevel:
if self.deprecateLevel < base.deprecateLevel:
c = Older("is less deprecated: %s vs. %s in base" % (
self.deprecations[self.deprecateLevel],
self.deprecations[base.deprecateLevel]))
else:
c = Newer("is more deprecated: %s vs. %s in base" % (
self.deprecations[self.deprecateLevel],
self.deprecations[base.deprecateLevel]))
compatibility = compatibility.combine(c)
selflen = len(self.blocks)
baselen = len(base.blocks)
samelen = min(selflen, baselen)
for i in xrange(0, samelen):
selfblock = self.blocks[i]
baseblock = base.blocks[i]
c = selfblock.compatibleWithBase(baseblock)
if not c.same():
c = Incompatible("block %d isn't identical" % i)
compatibility = compatibility.combine(c)
if selflen > baselen:
c = Newer("has %d extra blocks" % (selflen - baselen))
elif selflen < baselen:
c = Older("missing %d extra blocks" % (baselen - selflen))
else:
c = Same()
compatibility = compatibility.combine(c)
return compatibility
class Block(object):
SINGLE = "Single"
MULTIPLE = "Multiple"
VARIABLE = "Variable"
repeats = [ SINGLE, MULTIPLE, VARIABLE ]
repeatswithcount = [ MULTIPLE ]
def __init__(self, name, repeat, count=None):
self.name = name
self.repeat = repeat
self.count = count
self.variables = [ ]
def addVariable(self, variable):
self.variables.append(variable)
def compatibleWithBase(self, base):
if self.name != base.name:
return Incompatible("has different name: %s vs. %s in base"
% (self.name, base.name))
if self.repeat != base.repeat:
return Incompatible("has different repeat: %s vs. %s in base"
% (self.repeat, base.repeat))
if self.repeat in Block.repeatswithcount:
if self.count != base.count:
return Incompatible("has different count: %s vs. %s in base"
% (self.count, base.count))
compatibility = Same()
selflen = len(self.variables)
baselen = len(base.variables)
for i in xrange(0, min(selflen, baselen)):
selfvar = self.variables[i]
basevar = base.variables[i]
c = selfvar.compatibleWithBase(basevar)
if not c.same():
c = Incompatible("variable %d isn't identical" % i)
compatibility = compatibility.combine(c)
if selflen > baselen:
c = Newer("has %d extra variables" % (selflen - baselen))
elif selflen < baselen:
c = Older("missing %d extra variables" % (baselen - selflen))
else:
c = Same()
compatibility = compatibility.combine(c)
return compatibility
class Variable:
U8 = "U8"; U16 = "U16"; U32 = "U32"; U64 = "U64"
S8 = "S8"; S16 = "S16"; S32 = "S32"; S64 = "S64"
F32 = "F32"; F64 = "F64"
LLVECTOR3 = "LLVector3"; LLVECTOR3D = "LLVector3d"; LLVECTOR4 = "LLVector4"
LLQUATERNION = "LLQuaternion"
LLUUID = "LLUUID"
BOOL = "BOOL"
IPADDR = "IPADDR"; IPPORT = "IPPORT"
FIXED = "Fixed"
VARIABLE = "Variable"
types = [ U8, U16, U32, U64, S8, S16, S32, S64, F32, F64,
LLVECTOR3, LLVECTOR3D, LLVECTOR4, LLQUATERNION,
LLUUID, BOOL, IPADDR, IPPORT, FIXED, VARIABLE ]
typeswithsize = [ FIXED, VARIABLE ]
def __init__(self, name, type, size):
self.name = name
self.type = type
self.size = size
def compatibleWithBase(self, base):
if self.name != base.name:
return Incompatible("has different name: %s vs. %s in base"
% (self.name, base.name))
if self.type != base.type:
return Incompatible("has different type: %s vs. %s in base"
% (self.type, base.type))
if self.type in Variable.typeswithsize:
if self.size != base.size:
return Incompatible("has different size: %s vs. %s in base"
% (self.size, base.size))
return Same()
###
### Parsing Message Templates
###
class TemplateParser:
def __init__(self, tokens):
self._tokens = tokens
self._version = 0
self._numbers = { }
for p in Message.priorities:
self._numbers[p] = 0
def parseTemplate(self):
tokens = self._tokens
t = Template()
while True:
if tokens.want("version"):
v = float(tokens.require(tokens.wantFloat()))
self._version = v
t.version = v
continue
m = self.parseMessage()
if m:
t.addMessage(m)
continue
if self._version >= 2.0:
tokens.require(tokens.wantEOF())
break
else:
if tokens.wantEOF():
break
tokens.consume()
# just assume (gulp) that this is a comment
# line 468: "sim -> dataserver"
return t
def parseMessage(self):
tokens = self._tokens
if not tokens.want("{"):
return None
name = tokens.require(tokens.wantSymbol())
priority = tokens.require(tokens.wantOneOf(Message.priorities))
if self._version >= 2.0 or priority in Message.prioritieswithnumber:
number = int("+" + tokens.require(tokens.wantInteger()), 0)
else:
self._numbers[priority] += 1
number = self._numbers[priority]
trust = tokens.require(tokens.wantOneOf(Message.trusts))
coding = tokens.require(tokens.wantOneOf(Message.encodings))
m = Message(name, number, priority, trust, coding)
if self._version >= 2.0:
d = tokens.wantOneOf(Message.deprecations)
if d:
m.deprecate(d)
while True:
b = self.parseBlock()
if not b:
break
m.addBlock(b)
tokens.require(tokens.want("}"))
return m
def parseBlock(self):
tokens = self._tokens
if not tokens.want("{"):
return None
name = tokens.require(tokens.wantSymbol())
repeat = tokens.require(tokens.wantOneOf(Block.repeats))
if repeat in Block.repeatswithcount:
count = int(tokens.require(tokens.wantInteger()))
else:
count = None
b = Block(name, repeat, count)
while True:
v = self.parseVariable()
if not v:
break
b.addVariable(v)
tokens.require(tokens.want("}"))
return b
def parseVariable(self):
tokens = self._tokens
if not tokens.want("{"):
return None
name = tokens.require(tokens.wantSymbol())
type = tokens.require(tokens.wantOneOf(Variable.types))
if type in Variable.typeswithsize:
size = tokens.require(tokens.wantInteger())
else:
tokens.wantInteger() # in LandStatRequest: "{ ParcelLocalID S32 1 }"
size = None
tokens.require(tokens.want("}"))
return Variable(name, type, size)
def parseTemplateString(s):
return TemplateParser(TokenStream().fromString(s)).parseTemplate()
def parseTemplateFile(f):
return TemplateParser(TokenStream().fromFile(f)).parseTemplate()