BaseTools/Source/Python/Common/RangeExpression.py - device/linaro/bootloader/edk2 - Git at Google

 # # @file
 # This file is used to parse and evaluate range expression in Pcd declaration.
 #
 # Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
 # This program and the accompanying materials
 # are licensed and made available under the terms and conditions of the BSD License
 # which accompanies this distribution.    The full text of the license may be found at
 # http://opensource.org/licenses/bsd-license.php
 #
 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

 # # Import Modules
 #
 from Common.GlobalData import *
 from CommonDataClass.Exceptions import BadExpression
 from CommonDataClass.Exceptions import WrnExpression
 import uuid

 ERR_STRING_EXPR = 'This operator cannot be used in string expression: [%s].'
 ERR_SNYTAX = 'Syntax error, the rest of expression cannot be evaluated: [%s].'
 ERR_MATCH = 'No matching right parenthesis.'
 ERR_STRING_TOKEN = 'Bad string token: [%s].'
 ERR_MACRO_TOKEN = 'Bad macro token: [%s].'
 ERR_EMPTY_TOKEN = 'Empty token is not allowed.'
 ERR_PCD_RESOLVE = 'PCD token cannot be resolved: [%s].'
 ERR_VALID_TOKEN = 'No more valid token found from rest of string: [%s].'
 ERR_EXPR_TYPE = 'Different types found in expression.'
 ERR_OPERATOR_UNSUPPORT = 'Unsupported operator: [%s]'
 ERR_REL_NOT_IN = 'Expect "IN" after "not" operator.'
 WRN_BOOL_EXPR = 'Operand of boolean type cannot be used in arithmetic expression.'
 WRN_EQCMP_STR_OTHERS = '== Comparison between Operand of string type and Boolean/Number Type always return False.'
 WRN_NECMP_STR_OTHERS = '!= Comparison between Operand of string type and Boolean/Number Type always return True.'
 ERR_RELCMP_STR_OTHERS = 'Operator taking Operand of string type and Boolean/Number Type is not allowed: [%s].'
 ERR_STRING_CMP = 'Unicode string and general string cannot be compared: [%s %s %s]'
 ERR_ARRAY_TOKEN = 'Bad C array or C format GUID token: [%s].'
 ERR_ARRAY_ELE = 'This must be HEX value for NList or Array: [%s].'
 ERR_EMPTY_EXPR = 'Empty expression is not allowed.'
 ERR_IN_OPERAND = 'Macro after IN operator can only be: $(FAMILY), $(ARCH), $(TOOL_CHAIN_TAG) and $(TARGET).'

 def MaxOfType(DataType):
     if DataType == 'UINT8':
         return int('0xFF', 16)
     if DataType == 'UINT16':
         return int('0xFFFF', 16)
     if DataType == 'UINT32':
         return int('0xFFFFFFFF', 16)
     if DataType == 'UINT64':
         return int('0xFFFFFFFFFFFFFFFF', 16)

 class RangeObject(object):
     def __init__(self, start, end, empty = False):

         if int(start) < int(end):
             self.start = int(start)
             self.end = int(end)
         else:
             self.start = int(end)
             self.end = int(start)
         self.empty = empty

 class RangeContainer(object):
     def __init__(self):
         self.rangelist = []

     def push(self, RangeObject):
         self.rangelist.append(RangeObject)
         self.rangelist = sorted(self.rangelist, key = lambda rangeobj : rangeobj.start)
         self.merge()

     def pop(self):
         for item in self.rangelist:
             yield item

     def __clean__(self):
         newrangelist = []
         for rangeobj in self.rangelist:
             if rangeobj.empty == True:
                 continue
             else:
                 newrangelist.append(rangeobj)
         self.rangelist = newrangelist
     def merge(self):
         self.__clean__()
         for i in range(0, len(self.rangelist) - 1):
             if self.rangelist[i + 1].start > self.rangelist[i].end:
                 continue
             else:
                 self.rangelist[i + 1].start = self.rangelist[i].start
                 self.rangelist[i + 1].end = self.rangelist[i + 1].end > self.rangelist[i].end and self.rangelist[i + 1].end or self.rangelist[i].end
                 self.rangelist[i].empty = True

         self.__clean__()

     def dump(self):
         print "----------------------"
         rangelist = ""
         for object in self.rangelist:
             rangelist = rangelist + "[%d , %d]" % (object.start, object.end)
         print rangelist


 class XOROperatorObject(object):
     def __init__(self):
         pass
     def Calculate(self, Operand, DataType, SymbolTable):
         if type(Operand) == type('') and not Operand.isalnum():
             Expr = "XOR ..."
             raise BadExpression(ERR_SNYTAX % Expr)
         rangeId = str(uuid.uuid1())
         rangeContainer = RangeContainer()
         rangeContainer.push(RangeObject(0, int(Operand) - 1))
         rangeContainer.push(RangeObject(int(Operand) + 1, MaxOfType(DataType)))
         SymbolTable[rangeId] = rangeContainer
         return rangeId

 class LEOperatorObject(object):
     def __init__(self):
         pass
     def Calculate(self, Operand, DataType, SymbolTable):
         if type(Operand) == type('') and not Operand.isalnum():
             Expr = "LE ..."
             raise BadExpression(ERR_SNYTAX % Expr)
         rangeId1 = str(uuid.uuid1())
         rangeContainer = RangeContainer()
         rangeContainer.push(RangeObject(0, int(Operand)))
         SymbolTable[rangeId1] = rangeContainer
         return rangeId1
 class LTOperatorObject(object):
     def __init__(self):
         pass
     def Calculate(self, Operand, DataType, SymbolTable):
         if type(Operand) == type('') and not Operand.isalnum():
             Expr = "LT ..."
             raise BadExpression(ERR_SNYTAX % Expr)
         rangeId1 = str(uuid.uuid1())
         rangeContainer = RangeContainer()
         rangeContainer.push(RangeObject(0, int(Operand) - 1))
         SymbolTable[rangeId1] = rangeContainer
         return rangeId1

 class GEOperatorObject(object):
     def __init__(self):
         pass
     def Calculate(self, Operand, DataType, SymbolTable):
         if type(Operand) == type('') and not Operand.isalnum():
             Expr = "GE ..."
             raise BadExpression(ERR_SNYTAX % Expr)
         rangeId1 = str(uuid.uuid1())
         rangeContainer = RangeContainer()
         rangeContainer.push(RangeObject(int(Operand), MaxOfType(DataType)))
         SymbolTable[rangeId1] = rangeContainer
         return rangeId1

 class GTOperatorObject(object):
     def __init__(self):
         pass
     def Calculate(self, Operand, DataType, SymbolTable):
         if type(Operand) == type('') and not Operand.isalnum():
             Expr = "GT ..."
             raise BadExpression(ERR_SNYTAX % Expr)
         rangeId1 = str(uuid.uuid1())
         rangeContainer = RangeContainer()
         rangeContainer.push(RangeObject(int(Operand) + 1, MaxOfType(DataType)))
         SymbolTable[rangeId1] = rangeContainer
         return rangeId1

 class EQOperatorObject(object):
     def __init__(self):
         pass
     def Calculate(self, Operand, DataType, SymbolTable):
         if type(Operand) == type('') and not Operand.isalnum():
             Expr = "EQ ..."
             raise BadExpression(ERR_SNYTAX % Expr)
         rangeId1 = str(uuid.uuid1())
         rangeContainer = RangeContainer()
         rangeContainer.push(RangeObject(int(Operand) , int(Operand)))
         SymbolTable[rangeId1] = rangeContainer
         return rangeId1

 def GetOperatorObject(Operator):
     if Operator == '>':
         return GTOperatorObject()
     elif Operator == '>=':
         return GEOperatorObject()
     elif Operator == '<':
         return LTOperatorObject()
     elif Operator == '<=':
         return LEOperatorObject()
     elif Operator == '==':
         return EQOperatorObject()
     elif Operator == '^':
         return XOROperatorObject()
     else:
         raise BadExpression("Bad Operator")

 class RangeExpression(object):
     # Logical operator mapping
     LogicalOperators = {
         '&&' : 'and', '||' : 'or',
         '!'  : 'not', 'AND': 'and',
         'OR' : 'or' , 'NOT': 'not',
         'XOR': '^'  , 'xor': '^',
         'EQ' : '==' , 'NE' : '!=',
         'GT' : '>'  , 'LT' : '<',
         'GE' : '>=' , 'LE' : '<=',
         'IN' : 'in'
     }

     NonLetterOpLst = ['+', '-', '&', '|', '^', '!', '=', '>', '<']

     PcdPattern = re.compile(r'[_a-zA-Z][0-9A-Za-z_]*\.[_a-zA-Z][0-9A-Za-z_]*$')
     HexPattern = re.compile(r'0[xX][0-9a-fA-F]+')
     RegGuidPattern = re.compile(r'[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}')
     ExRegGuidPattern = re.compile(r'[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$')

     SymbolPattern = re.compile("("
                                  "\$\([A-Z][A-Z0-9_]*\)|\$\(\w+\.\w+\)|\w+\.\w+|"
                                  "&&|\|\||!(?!=)|"
                                  "(?<=\W)AND(?=\W)|(?<=\W)OR(?=\W)|(?<=\W)NOT(?=\W)|(?<=\W)XOR(?=\W)|"
                                  "(?<=\W)EQ(?=\W)|(?<=\W)NE(?=\W)|(?<=\W)GT(?=\W)|(?<=\W)LT(?=\W)|(?<=\W)GE(?=\W)|(?<=\W)LE(?=\W)"
                                ")")

     RangePattern = re.compile(r'[0-9]+ - [0-9]+')

     def preProcessRangeExpr(self, expr):
         # convert hex to int
         # convert interval to object index. ex. 1 - 10 to a GUID
         expr = expr.strip()
         NumberDict = {}
         for HexNumber in self.HexPattern.findall(expr):
             Number = str(int(HexNumber, 16))
             NumberDict[HexNumber] = Number
         for HexNum in NumberDict:
             expr = expr.replace(HexNum, NumberDict[HexNum])

         rangedict = {}
         for validrange in self.RangePattern.findall(expr):
             start, end = validrange.split(" - ")
             start = start.strip()
             end = end.strip()
             rangeid = str(uuid.uuid1())
             rangeContainer = RangeContainer()
             rangeContainer.push(RangeObject(start, end))
             self.operanddict[str(rangeid)] = rangeContainer
             rangedict[validrange] = str(rangeid)

         for validrange in rangedict:
             expr = expr.replace(validrange, rangedict[validrange])

         self._Expr = expr
         return expr


     def EvalRange(self, Operator, Oprand):

         operatorobj = GetOperatorObject(Operator)
         return operatorobj.Calculate(Oprand, self.PcdDataType, self.operanddict)

     def Rangeintersection(self, Oprand1, Oprand2):
         rangeContainer1 = self.operanddict[Oprand1]
         rangeContainer2 = self.operanddict[Oprand2]
         rangeContainer = RangeContainer()
         for range1 in rangeContainer1.pop():
             for range2 in rangeContainer2.pop():
                 start1 = range1.start
                 end1 = range1.end
                 start2 = range2.start
                 end2 = range2.end
                 if start1 >= start2:
                     start1, start2 = start2, start1
                     end1, end2 = end2, end1
                 if range1.empty:
                     rangeid = str(uuid.uuid1())
                     rangeContainer.push(RangeObject(0, 0, True))
                 if end1 < start2:
                     rangeid = str(uuid.uuid1())
                     rangeContainer.push(RangeObject(0, 0, True))
                 elif end1 == start2:
                     rangeid = str(uuid.uuid1())
                     rangeContainer.push(RangeObject(end1, end1))
                 elif end1 <= end2 and end1 > start2:
                     rangeid = str(uuid.uuid1())
                     rangeContainer.push(RangeObject(start2, end1))
                 elif end1 >= end2:
                     rangeid = str(uuid.uuid1())
                     rangeContainer.push(RangeObject(start2, end2))

         self.operanddict[rangeid] = rangeContainer
 #        rangeContainer.dump()
         return rangeid

     def Rangecollections(self, Oprand1, Oprand2):

         rangeContainer1 = self.operanddict[Oprand1]
         rangeContainer2 = self.operanddict[Oprand2]
         rangeContainer = RangeContainer()

         for rangeobj in rangeContainer2.pop():
             rangeContainer.push(rangeobj)
         for rangeobj in rangeContainer1.pop():
             rangeContainer.push(rangeobj)

         rangeid = str(uuid.uuid1())
         self.operanddict[rangeid] = rangeContainer

 #        rangeContainer.dump()
         return rangeid


     def NegtiveRange(self, Oprand1):
         rangeContainer1 = self.operanddict[Oprand1]


         rangeids = []

         for rangeobj in rangeContainer1.pop():
             rangeContainer = RangeContainer()
             rangeid = str(uuid.uuid1())
             if rangeobj.empty:
                 rangeContainer.push(RangeObject(0, MaxOfType(self.PcdDataType)))
             else:
                 if rangeobj.start > 0:
                     rangeContainer.push(RangeObject(0, rangeobj.start - 1))
                 if rangeobj.end < MaxOfType(self.PcdDataType):
                     rangeContainer.push(RangeObject(rangeobj.end + 1, MaxOfType(self.PcdDataType)))
             self.operanddict[rangeid] = rangeContainer
             rangeids.append(rangeid)

         if len(rangeids) == 0:
             rangeContainer = RangeContainer()
             rangeContainer.push(RangeObject(0, MaxOfType(self.PcdDataType)))
             rangeid = str(uuid.uuid1())
             self.operanddict[rangeid] = rangeContainer
             return rangeid

         if len(rangeids) == 1:
             return rangeids[0]

         re = self.Rangeintersection(rangeids[0], rangeids[1])
         for i in range(2, len(rangeids)):
             re = self.Rangeintersection(re, rangeids[i])

         rangeid2 = str(uuid.uuid1())
         self.operanddict[rangeid2] = self.operanddict[re]
         return rangeid2

     def Eval(self, Operator, Oprand1, Oprand2 = None):

         if Operator in ["!", "NOT", "not"]:
             if not self.RegGuidPattern.match(Oprand1.strip()):
                 raise BadExpression(ERR_STRING_EXPR % Operator)
             return self.NegtiveRange(Oprand1)
         else:
             if Operator in ["==", ">=", "<=", ">", "<", '^']:
                 return self.EvalRange(Operator, Oprand1)
             elif Operator == 'and' :
                 if not self.ExRegGuidPattern.match(Oprand1.strip()) or not self.ExRegGuidPattern.match(Oprand2.strip()):
                     raise BadExpression(ERR_STRING_EXPR % Operator)
                 return self.Rangeintersection(Oprand1, Oprand2)
             elif Operator == 'or':
                 if not self.ExRegGuidPattern.match(Oprand1.strip()) or not self.ExRegGuidPattern.match(Oprand2.strip()):
                     raise BadExpression(ERR_STRING_EXPR % Operator)
                 return self.Rangecollections(Oprand1, Oprand2)
             else:
                 raise BadExpression(ERR_STRING_EXPR % Operator)


     def __init__(self, Expression, PcdDataType, SymbolTable = {}):
         self._NoProcess = False
         if type(Expression) != type(''):
             self._Expr = Expression
             self._NoProcess = True
             return

         self._Expr = Expression.strip()

         if not self._Expr.strip():
             raise BadExpression(ERR_EMPTY_EXPR)

         #
         # The symbol table including PCD and macro mapping
         #
         self._Symb = SymbolTable
         self._Symb.update(self.LogicalOperators)
         self._Idx = 0
         self._Len = len(self._Expr)
         self._Token = ''
         self._WarnExcept = None


         # Literal token without any conversion
         self._LiteralToken = ''

         # store the operand object
         self.operanddict = {}
         # The Pcd max value depends on PcdDataType
         self.PcdDataType = PcdDataType

     # Public entry for this class
     #   @param RealValue: False: only evaluate if the expression is true or false, used for conditional expression
     #                     True : return the evaluated str(value), used for PCD value
     #
     #   @return: True or False if RealValue is False
     #            Evaluated value of string format if RealValue is True
     #
     def __call__(self, RealValue = False, Depth = 0):
         if self._NoProcess:
             return self._Expr

         self._Depth = Depth

         self._Expr = self._Expr.strip()

         self.preProcessRangeExpr(self._Expr)

         # check if the expression does not need to evaluate
         if RealValue and Depth == 0:
             self._Token = self._Expr
             if self.ExRegGuidPattern.match(self._Expr):
                 return [self.operanddict[self._Expr] ]

             self._Idx = 0
             self._Token = ''

         Val = self._OrExpr()
         RealVal = Val

         RangeIdList = RealVal.split("or")
         RangeList = []
         for rangeid in RangeIdList:
             RangeList.append(self.operanddict[rangeid.strip()])

         return RangeList

     # Template function to parse binary operators which have same precedence
     # Expr [Operator Expr]*
     def _ExprFuncTemplate(self, EvalFunc, OpLst):
         Val = EvalFunc()
         while self._IsOperator(OpLst):
             Op = self._Token
             try:
                 Val = self.Eval(Op, Val, EvalFunc())
             except WrnExpression, Warn:
                 self._WarnExcept = Warn
                 Val = Warn.result
         return Val

     # A [|| B]*
     def _OrExpr(self):
         return self._ExprFuncTemplate(self._AndExpr, ["OR", "or"])

     # A [&& B]*
     def _AndExpr(self):
         return self._ExprFuncTemplate(self._NeExpr, ["AND", "and"])

     def _NeExpr(self):
         Val = self._RelExpr()
         while self._IsOperator([ "!=", "NOT", "not"]):
             Op = self._Token
             if Op in ["!", "NOT", "not"]:
                 if not self._IsOperator(["IN", "in"]):
                     raise BadExpression(ERR_REL_NOT_IN)
                 Op += ' ' + self._Token
             try:
                 Val = self.Eval(Op, Val, self._RelExpr())
             except WrnExpression, Warn:
                 self._WarnExcept = Warn
                 Val = Warn.result
         return Val

     # [!]*A
     def _RelExpr(self):
         if self._IsOperator(["NOT" , "LE", "GE", "LT", "GT", "EQ", "XOR"]):
             Token = self._Token
             Val = self._NeExpr()
             try:
                 return self.Eval(Token, Val)
             except WrnExpression, Warn:
                 self._WarnExcept = Warn
                 return Warn.result
         return self._IdenExpr()

     # Parse identifier or encapsulated expression
     def _IdenExpr(self):
         Tk = self._GetToken()
         if Tk == '(':
             Val = self._OrExpr()
             try:
                 # _GetToken may also raise BadExpression
                 if self._GetToken() != ')':
                     raise BadExpression(ERR_MATCH)
             except BadExpression:
                 raise BadExpression(ERR_MATCH)
             return Val
         return Tk

     # Skip whitespace or tab
     def __SkipWS(self):
         for Char in self._Expr[self._Idx:]:
             if Char not in ' \t':
                 break
             self._Idx += 1

     # Try to convert string to number
     def __IsNumberToken(self):
         Radix = 10
         if self._Token.lower()[0:2] == '0x' and len(self._Token) > 2:
             Radix = 16
         try:
             self._Token = int(self._Token, Radix)
             return True
         except ValueError:
             return False
         except TypeError:
             return False

     # Parse array: {...}
     def __GetArray(self):
         Token = '{'
         self._Idx += 1
         self.__GetNList(True)
         Token += self._LiteralToken
         if self._Idx >= self._Len or self._Expr[self._Idx] != '}':
             raise BadExpression(ERR_ARRAY_TOKEN % Token)
         Token += '}'

         # All whitespace and tabs in array are already stripped.
         IsArray = IsGuid = False
         if len(Token.split(',')) == 11 and len(Token.split(',{')) == 2 \
             and len(Token.split('},')) == 1:
             HexLen = [11, 6, 6, 5, 4, 4, 4, 4, 4, 4, 6]
             HexList = Token.split(',')
             if HexList[3].startswith('{') and \
                 not [Index for Index, Hex in enumerate(HexList) if len(Hex) > HexLen[Index]]:
                 IsGuid = True
         if Token.lstrip('{').rstrip('}').find('{') == -1:
             if not [Hex for Hex in Token.lstrip('{').rstrip('}').split(',') if len(Hex) > 4]:
                 IsArray = True
         if not IsArray and not IsGuid:
             raise BadExpression(ERR_ARRAY_TOKEN % Token)
         self._Idx += 1
         self._Token = self._LiteralToken = Token
         return self._Token

     # Parse string, the format must be: "..."
     def __GetString(self):
         Idx = self._Idx

         # Skip left quote
         self._Idx += 1

         # Replace escape \\\", \"
         Expr = self._Expr[self._Idx:].replace('\\\\', '//').replace('\\\"', '\\\'')
         for Ch in Expr:
             self._Idx += 1
             if Ch == '"':
                 break
         self._Token = self._LiteralToken = self._Expr[Idx:self._Idx]
         if not self._Token.endswith('"'):
             raise BadExpression(ERR_STRING_TOKEN % self._Token)
         self._Token = self._Token[1:-1]
         return self._Token

     # Get token that is comprised by alphanumeric, underscore or dot(used by PCD)
     # @param IsAlphaOp: Indicate if parsing general token or script operator(EQ, NE...)
     def __GetIdToken(self, IsAlphaOp = False):
         IdToken = ''
         for Ch in self._Expr[self._Idx:]:
             if not self.__IsIdChar(Ch):
                 break
             self._Idx += 1
             IdToken += Ch

         self._Token = self._LiteralToken = IdToken
         if not IsAlphaOp:
             self.__ResolveToken()
         return self._Token

     # Try to resolve token
     def __ResolveToken(self):
         if not self._Token:
             raise BadExpression(ERR_EMPTY_TOKEN)

         # PCD token
         if self.PcdPattern.match(self._Token):
             if self._Token not in self._Symb:
                 Ex = BadExpression(ERR_PCD_RESOLVE % self._Token)
                 Ex.Pcd = self._Token
                 raise Ex
             self._Token = RangeExpression(self._Symb[self._Token], self._Symb)(True, self._Depth + 1)
             if type(self._Token) != type(''):
                 self._LiteralToken = hex(self._Token)
                 return

         if self._Token.startswith('"'):
             self._Token = self._Token[1:-1]
         elif self._Token in ["FALSE", "false", "False"]:
             self._Token = False
         elif self._Token in ["TRUE", "true", "True"]:
             self._Token = True
         else:
             self.__IsNumberToken()

     def __GetNList(self, InArray = False):
         self._GetSingleToken()
         if not self.__IsHexLiteral():
             if InArray:
                 raise BadExpression(ERR_ARRAY_ELE % self._Token)
             return self._Token

         self.__SkipWS()
         Expr = self._Expr[self._Idx:]
         if not Expr.startswith(','):
             return self._Token

         NList = self._LiteralToken
         while Expr.startswith(','):
             NList += ','
             self._Idx += 1
             self.__SkipWS()
             self._GetSingleToken()
             if not self.__IsHexLiteral():
                 raise BadExpression(ERR_ARRAY_ELE % self._Token)
             NList += self._LiteralToken
             self.__SkipWS()
             Expr = self._Expr[self._Idx:]
         self._Token = self._LiteralToken = NList
         return self._Token

     def __IsHexLiteral(self):
         if self._LiteralToken.startswith('{') and \
             self._LiteralToken.endswith('}'):
             return True

         if self.HexPattern.match(self._LiteralToken):
             Token = self._LiteralToken[2:]
             Token = Token.lstrip('0')
             if not Token:
                 self._LiteralToken = '0x0'
             else:
                 self._LiteralToken = '0x' + Token.lower()
             return True
         return False

     def _GetToken(self):
         return self.__GetNList()

     @staticmethod
     def __IsIdChar(Ch):
         return Ch in '._/:' or Ch.isalnum()

     # Parse operand
     def _GetSingleToken(self):
         self.__SkipWS()
         Expr = self._Expr[self._Idx:]
         if Expr.startswith('L"'):
             # Skip L
             self._Idx += 1
             UStr = self.__GetString()
             self._Token = 'L"' + UStr + '"'
             return self._Token

         self._Token = ''
         if Expr:
             Ch = Expr[0]
             Match = self.RegGuidPattern.match(Expr)
             if Match and not Expr[Match.end():Match.end() + 1].isalnum() \
                 and Expr[Match.end():Match.end() + 1] != '_':
                 self._Idx += Match.end()
                 self._Token = Expr[0:Match.end()]
                 return self._Token
             elif self.__IsIdChar(Ch):
                 return self.__GetIdToken()
             elif Ch == '(' or Ch == ')':
                 self._Idx += 1
                 self._Token = Ch
                 return self._Token

         raise BadExpression(ERR_VALID_TOKEN % Expr)

     # Parse operator
     def _GetOperator(self):
         self.__SkipWS()
         LegalOpLst = ['&&', '||', '!=', '==', '>=', '<='] + self.NonLetterOpLst

         self._Token = ''
         Expr = self._Expr[self._Idx:]

         # Reach end of expression
         if not Expr:
             return ''

         # Script operator: LT, GT, LE, GE, EQ, NE, and, or, xor, not
         if Expr[0].isalpha():
             return self.__GetIdToken(True)

         # Start to get regular operator: +, -, <, > ...
         if Expr[0] not in self.NonLetterOpLst:
             return ''

         OpToken = ''
         for Ch in Expr:
             if Ch in self.NonLetterOpLst:
                 if '!' == Ch and OpToken:
                     break
                 self._Idx += 1
                 OpToken += Ch
             else:
                 break

         if OpToken not in LegalOpLst:
             raise BadExpression(ERR_OPERATOR_UNSUPPORT % OpToken)
         self._Token = OpToken
         return OpToken

     # Check if current token matches the operators given from OpList
     def _IsOperator(self, OpList):
         Idx = self._Idx
         self._GetOperator()
         if self._Token in OpList:
             if self._Token in self.LogicalOperators:
                 self._Token = self.LogicalOperators[self._Token]
             return True
         self._Idx = Idx
         return False


 #    UTRangeList()
	# # @file
	# This file is used to parse and evaluate range expression in Pcd declaration.
	#
	# Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
	# This program and the accompanying materials
	# are licensed and made available under the terms and conditions of the BSD License
	# which accompanies this distribution. The full text of the license may be found at
	# http://opensource.org/licenses/bsd-license.php
	#
	# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
	# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

	# # Import Modules
	#
	from Common.GlobalData import *
	from CommonDataClass.Exceptions import BadExpression
	from CommonDataClass.Exceptions import WrnExpression
	import uuid

	ERR_STRING_EXPR = 'This operator cannot be used in string expression: [%s].'
	ERR_SNYTAX = 'Syntax error, the rest of expression cannot be evaluated: [%s].'
	ERR_MATCH = 'No matching right parenthesis.'
	ERR_STRING_TOKEN = 'Bad string token: [%s].'
	ERR_MACRO_TOKEN = 'Bad macro token: [%s].'
	ERR_EMPTY_TOKEN = 'Empty token is not allowed.'
	ERR_PCD_RESOLVE = 'PCD token cannot be resolved: [%s].'
	ERR_VALID_TOKEN = 'No more valid token found from rest of string: [%s].'
	ERR_EXPR_TYPE = 'Different types found in expression.'
	ERR_OPERATOR_UNSUPPORT = 'Unsupported operator: [%s]'
	ERR_REL_NOT_IN = 'Expect "IN" after "not" operator.'
	WRN_BOOL_EXPR = 'Operand of boolean type cannot be used in arithmetic expression.'
	WRN_EQCMP_STR_OTHERS = '== Comparison between Operand of string type and Boolean/Number Type always return False.'
	WRN_NECMP_STR_OTHERS = '!= Comparison between Operand of string type and Boolean/Number Type always return True.'
	ERR_RELCMP_STR_OTHERS = 'Operator taking Operand of string type and Boolean/Number Type is not allowed: [%s].'
	ERR_STRING_CMP = 'Unicode string and general string cannot be compared: [%s %s %s]'
	ERR_ARRAY_TOKEN = 'Bad C array or C format GUID token: [%s].'
	ERR_ARRAY_ELE = 'This must be HEX value for NList or Array: [%s].'
	ERR_EMPTY_EXPR = 'Empty expression is not allowed.'
	ERR_IN_OPERAND = 'Macro after IN operator can only be: $(FAMILY), $(ARCH), $(TOOL_CHAIN_TAG) and $(TARGET).'

	def MaxOfType(DataType):
	if DataType == 'UINT8':
	return int('0xFF', 16)
	if DataType == 'UINT16':
	return int('0xFFFF', 16)
	if DataType == 'UINT32':
	return int('0xFFFFFFFF', 16)
	if DataType == 'UINT64':
	return int('0xFFFFFFFFFFFFFFFF', 16)

	class RangeObject(object):
	def __init__(self, start, end, empty = False):

	if int(start) < int(end):
	self.start = int(start)
	self.end = int(end)
	else:
	self.start = int(end)
	self.end = int(start)
	self.empty = empty

	class RangeContainer(object):
	def __init__(self):
	self.rangelist = []

	def push(self, RangeObject):
	self.rangelist.append(RangeObject)
	self.rangelist = sorted(self.rangelist, key = lambda rangeobj : rangeobj.start)
	self.merge()

	def pop(self):
	for item in self.rangelist:
	yield item

	def __clean__(self):
	newrangelist = []
	for rangeobj in self.rangelist:
	if rangeobj.empty == True:
	continue
	else:
	newrangelist.append(rangeobj)
	self.rangelist = newrangelist
	def merge(self):
	self.__clean__()
	for i in range(0, len(self.rangelist) - 1):
	if self.rangelist[i + 1].start > self.rangelist[i].end:
	continue
	else:
	self.rangelist[i + 1].start = self.rangelist[i].start
	self.rangelist[i + 1].end = self.rangelist[i + 1].end > self.rangelist[i].end and self.rangelist[i + 1].end or self.rangelist[i].end
	self.rangelist[i].empty = True

	self.__clean__()

	def dump(self):
	print "----------------------"
	rangelist = ""
	for object in self.rangelist:
	rangelist = rangelist + "[%d , %d]" % (object.start, object.end)
	print rangelist


	class XOROperatorObject(object):
	def __init__(self):
	pass
	def Calculate(self, Operand, DataType, SymbolTable):
	if type(Operand) == type('') and not Operand.isalnum():
	Expr = "XOR ..."
	raise BadExpression(ERR_SNYTAX % Expr)
	rangeId = str(uuid.uuid1())
	rangeContainer = RangeContainer()
	rangeContainer.push(RangeObject(0, int(Operand) - 1))
	rangeContainer.push(RangeObject(int(Operand) + 1, MaxOfType(DataType)))
	SymbolTable[rangeId] = rangeContainer
	return rangeId

	class LEOperatorObject(object):
	def __init__(self):
	pass
	def Calculate(self, Operand, DataType, SymbolTable):
	if type(Operand) == type('') and not Operand.isalnum():
	Expr = "LE ..."
	raise BadExpression(ERR_SNYTAX % Expr)
	rangeId1 = str(uuid.uuid1())
	rangeContainer = RangeContainer()
	rangeContainer.push(RangeObject(0, int(Operand)))
	SymbolTable[rangeId1] = rangeContainer
	return rangeId1
	class LTOperatorObject(object):
	def __init__(self):
	pass
	def Calculate(self, Operand, DataType, SymbolTable):
	if type(Operand) == type('') and not Operand.isalnum():
	Expr = "LT ..."
	raise BadExpression(ERR_SNYTAX % Expr)
	rangeId1 = str(uuid.uuid1())
	rangeContainer = RangeContainer()
	rangeContainer.push(RangeObject(0, int(Operand) - 1))
	SymbolTable[rangeId1] = rangeContainer
	return rangeId1

	class GEOperatorObject(object):
	def __init__(self):
	pass
	def Calculate(self, Operand, DataType, SymbolTable):
	if type(Operand) == type('') and not Operand.isalnum():
	Expr = "GE ..."
	raise BadExpression(ERR_SNYTAX % Expr)
	rangeId1 = str(uuid.uuid1())
	rangeContainer = RangeContainer()
	rangeContainer.push(RangeObject(int(Operand), MaxOfType(DataType)))
	SymbolTable[rangeId1] = rangeContainer
	return rangeId1

	class GTOperatorObject(object):
	def __init__(self):
	pass
	def Calculate(self, Operand, DataType, SymbolTable):
	if type(Operand) == type('') and not Operand.isalnum():
	Expr = "GT ..."
	raise BadExpression(ERR_SNYTAX % Expr)
	rangeId1 = str(uuid.uuid1())
	rangeContainer = RangeContainer()
	rangeContainer.push(RangeObject(int(Operand) + 1, MaxOfType(DataType)))
	SymbolTable[rangeId1] = rangeContainer
	return rangeId1

	class EQOperatorObject(object):
	def __init__(self):
	pass
	def Calculate(self, Operand, DataType, SymbolTable):
	if type(Operand) == type('') and not Operand.isalnum():
	Expr = "EQ ..."
	raise BadExpression(ERR_SNYTAX % Expr)
	rangeId1 = str(uuid.uuid1())
	rangeContainer = RangeContainer()
	rangeContainer.push(RangeObject(int(Operand) , int(Operand)))
	SymbolTable[rangeId1] = rangeContainer
	return rangeId1

	def GetOperatorObject(Operator):
	if Operator == '>':
	return GTOperatorObject()
	elif Operator == '>=':
	return GEOperatorObject()
	elif Operator == '<':
	return LTOperatorObject()
	elif Operator == '<=':
	return LEOperatorObject()
	elif Operator == '==':
	return EQOperatorObject()
	elif Operator == '^':
	return XOROperatorObject()
	else:
	raise BadExpression("Bad Operator")

	class RangeExpression(object):
	# Logical operator mapping
	LogicalOperators = {
	'&&' : 'and', '\|\|' : 'or',
	'!' : 'not', 'AND': 'and',
	'OR' : 'or' , 'NOT': 'not',
	'XOR': '^' , 'xor': '^',
	'EQ' : '==' , 'NE' : '!=',
	'GT' : '>' , 'LT' : '<',
	'GE' : '>=' , 'LE' : '<=',
	'IN' : 'in'
	}

	NonLetterOpLst = ['+', '-', '&', '\|', '^', '!', '=', '>', '<']

	PcdPattern = re.compile(r'[_a-zA-Z][0-9A-Za-z_]\.[_a-zA-Z][0-9A-Za-z_]$')
	HexPattern = re.compile(r'0[xX][0-9a-fA-F]+')
	RegGuidPattern = re.compile(r'[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}')
	ExRegGuidPattern = re.compile(r'[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$')

	SymbolPattern = re.compile("("
	"\$\([A-Z][A-Z0-9_]*\)\|\$\(\w+\.\w+\)\|\w+\.\w+\|"
	"&&\|\\|\\|\|!(?!=)\|"
	"(?<=\W)AND(?=\W)\|(?<=\W)OR(?=\W)\|(?<=\W)NOT(?=\W)\|(?<=\W)XOR(?=\W)\|"
	"(?<=\W)EQ(?=\W)\|(?<=\W)NE(?=\W)\|(?<=\W)GT(?=\W)\|(?<=\W)LT(?=\W)\|(?<=\W)GE(?=\W)\|(?<=\W)LE(?=\W)"
	")")

	RangePattern = re.compile(r'[0-9]+ - [0-9]+')

	def preProcessRangeExpr(self, expr):
	# convert hex to int
	# convert interval to object index. ex. 1 - 10 to a GUID
	expr = expr.strip()
	NumberDict = {}
	for HexNumber in self.HexPattern.findall(expr):
	Number = str(int(HexNumber, 16))
	NumberDict[HexNumber] = Number
	for HexNum in NumberDict:
	expr = expr.replace(HexNum, NumberDict[HexNum])

	rangedict = {}
	for validrange in self.RangePattern.findall(expr):
	start, end = validrange.split(" - ")
	start = start.strip()
	end = end.strip()
	rangeid = str(uuid.uuid1())
	rangeContainer = RangeContainer()
	rangeContainer.push(RangeObject(start, end))
	self.operanddict[str(rangeid)] = rangeContainer
	rangedict[validrange] = str(rangeid)

	for validrange in rangedict:
	expr = expr.replace(validrange, rangedict[validrange])

	self._Expr = expr
	return expr


	def EvalRange(self, Operator, Oprand):

	operatorobj = GetOperatorObject(Operator)
	return operatorobj.Calculate(Oprand, self.PcdDataType, self.operanddict)

	def Rangeintersection(self, Oprand1, Oprand2):
	rangeContainer1 = self.operanddict[Oprand1]
	rangeContainer2 = self.operanddict[Oprand2]
	rangeContainer = RangeContainer()
	for range1 in rangeContainer1.pop():
	for range2 in rangeContainer2.pop():
	start1 = range1.start
	end1 = range1.end
	start2 = range2.start
	end2 = range2.end
	if start1 >= start2:
	start1, start2 = start2, start1
	end1, end2 = end2, end1
	if range1.empty:
	rangeid = str(uuid.uuid1())
	rangeContainer.push(RangeObject(0, 0, True))
	if end1 < start2:
	rangeid = str(uuid.uuid1())
	rangeContainer.push(RangeObject(0, 0, True))
	elif end1 == start2:
	rangeid = str(uuid.uuid1())
	rangeContainer.push(RangeObject(end1, end1))
	elif end1 <= end2 and end1 > start2:
	rangeid = str(uuid.uuid1())
	rangeContainer.push(RangeObject(start2, end1))
	elif end1 >= end2:
	rangeid = str(uuid.uuid1())
	rangeContainer.push(RangeObject(start2, end2))

	self.operanddict[rangeid] = rangeContainer
	# rangeContainer.dump()
	return rangeid

	def Rangecollections(self, Oprand1, Oprand2):

	rangeContainer1 = self.operanddict[Oprand1]
	rangeContainer2 = self.operanddict[Oprand2]
	rangeContainer = RangeContainer()

	for rangeobj in rangeContainer2.pop():
	rangeContainer.push(rangeobj)
	for rangeobj in rangeContainer1.pop():
	rangeContainer.push(rangeobj)

	rangeid = str(uuid.uuid1())
	self.operanddict[rangeid] = rangeContainer

	# rangeContainer.dump()
	return rangeid


	def NegtiveRange(self, Oprand1):
	rangeContainer1 = self.operanddict[Oprand1]


	rangeids = []

	for rangeobj in rangeContainer1.pop():
	rangeContainer = RangeContainer()
	rangeid = str(uuid.uuid1())
	if rangeobj.empty:
	rangeContainer.push(RangeObject(0, MaxOfType(self.PcdDataType)))
	else:
	if rangeobj.start > 0:
	rangeContainer.push(RangeObject(0, rangeobj.start - 1))
	if rangeobj.end < MaxOfType(self.PcdDataType):
	rangeContainer.push(RangeObject(rangeobj.end + 1, MaxOfType(self.PcdDataType)))
	self.operanddict[rangeid] = rangeContainer
	rangeids.append(rangeid)

	if len(rangeids) == 0:
	rangeContainer = RangeContainer()
	rangeContainer.push(RangeObject(0, MaxOfType(self.PcdDataType)))
	rangeid = str(uuid.uuid1())
	self.operanddict[rangeid] = rangeContainer
	return rangeid

	if len(rangeids) == 1:
	return rangeids[0]

	re = self.Rangeintersection(rangeids[0], rangeids[1])
	for i in range(2, len(rangeids)):
	re = self.Rangeintersection(re, rangeids[i])

	rangeid2 = str(uuid.uuid1())
	self.operanddict[rangeid2] = self.operanddict[re]
	return rangeid2

	def Eval(self, Operator, Oprand1, Oprand2 = None):

	if Operator in ["!", "NOT", "not"]:
	if not self.RegGuidPattern.match(Oprand1.strip()):
	raise BadExpression(ERR_STRING_EXPR % Operator)
	return self.NegtiveRange(Oprand1)
	else:
	if Operator in ["==", ">=", "<=", ">", "<", '^']:
	return self.EvalRange(Operator, Oprand1)
	elif Operator == 'and' :
	if not self.ExRegGuidPattern.match(Oprand1.strip()) or not self.ExRegGuidPattern.match(Oprand2.strip()):
	raise BadExpression(ERR_STRING_EXPR % Operator)
	return self.Rangeintersection(Oprand1, Oprand2)
	elif Operator == 'or':
	if not self.ExRegGuidPattern.match(Oprand1.strip()) or not self.ExRegGuidPattern.match(Oprand2.strip()):
	raise BadExpression(ERR_STRING_EXPR % Operator)
	return self.Rangecollections(Oprand1, Oprand2)
	else:
	raise BadExpression(ERR_STRING_EXPR % Operator)


	def __init__(self, Expression, PcdDataType, SymbolTable = {}):
	self._NoProcess = False
	if type(Expression) != type(''):
	self._Expr = Expression
	self._NoProcess = True
	return

	self._Expr = Expression.strip()

	if not self._Expr.strip():
	raise BadExpression(ERR_EMPTY_EXPR)

	#
	# The symbol table including PCD and macro mapping
	#
	self._Symb = SymbolTable
	self._Symb.update(self.LogicalOperators)
	self._Idx = 0
	self._Len = len(self._Expr)
	self._Token = ''
	self._WarnExcept = None


	# Literal token without any conversion
	self._LiteralToken = ''

	# store the operand object
	self.operanddict = {}
	# The Pcd max value depends on PcdDataType
	self.PcdDataType = PcdDataType

	# Public entry for this class
	# @param RealValue: False: only evaluate if the expression is true or false, used for conditional expression
	# True : return the evaluated str(value), used for PCD value
	#
	# @return: True or False if RealValue is False
	# Evaluated value of string format if RealValue is True
	#
	def __call__(self, RealValue = False, Depth = 0):
	if self._NoProcess:
	return self._Expr

	self._Depth = Depth

	self._Expr = self._Expr.strip()

	self.preProcessRangeExpr(self._Expr)

	# check if the expression does not need to evaluate
	if RealValue and Depth == 0:
	self._Token = self._Expr
	if self.ExRegGuidPattern.match(self._Expr):
	return [self.operanddict[self._Expr] ]

	self._Idx = 0
	self._Token = ''

	Val = self._OrExpr()
	RealVal = Val

	RangeIdList = RealVal.split("or")
	RangeList = []
	for rangeid in RangeIdList:
	RangeList.append(self.operanddict[rangeid.strip()])

	return RangeList

	# Template function to parse binary operators which have same precedence
	# Expr [Operator Expr]*
	def _ExprFuncTemplate(self, EvalFunc, OpLst):
	Val = EvalFunc()
	while self._IsOperator(OpLst):
	Op = self._Token
	try:
	Val = self.Eval(Op, Val, EvalFunc())
	except WrnExpression, Warn:
	self._WarnExcept = Warn
	Val = Warn.result
	return Val

	# A [\|\| B]*
	def _OrExpr(self):
	return self._ExprFuncTemplate(self._AndExpr, ["OR", "or"])

	# A [&& B]*
	def _AndExpr(self):
	return self._ExprFuncTemplate(self._NeExpr, ["AND", "and"])

	def _NeExpr(self):
	Val = self._RelExpr()
	while self._IsOperator([ "!=", "NOT", "not"]):
	Op = self._Token
	if Op in ["!", "NOT", "not"]:
	if not self._IsOperator(["IN", "in"]):
	raise BadExpression(ERR_REL_NOT_IN)
	Op += ' ' + self._Token
	try:
	Val = self.Eval(Op, Val, self._RelExpr())
	except WrnExpression, Warn:
	self._WarnExcept = Warn
	Val = Warn.result
	return Val

	# [!]*A
	def _RelExpr(self):
	if self._IsOperator(["NOT" , "LE", "GE", "LT", "GT", "EQ", "XOR"]):
	Token = self._Token
	Val = self._NeExpr()
	try:
	return self.Eval(Token, Val)
	except WrnExpression, Warn:
	self._WarnExcept = Warn
	return Warn.result
	return self._IdenExpr()

	# Parse identifier or encapsulated expression
	def _IdenExpr(self):
	Tk = self._GetToken()
	if Tk == '(':
	Val = self._OrExpr()
	try:
	# _GetToken may also raise BadExpression
	if self._GetToken() != ')':
	raise BadExpression(ERR_MATCH)
	except BadExpression:
	raise BadExpression(ERR_MATCH)
	return Val
	return Tk

	# Skip whitespace or tab
	def __SkipWS(self):
	for Char in self._Expr[self._Idx:]:
	if Char not in ' \t':
	break
	self._Idx += 1

	# Try to convert string to number
	def __IsNumberToken(self):
	Radix = 10
	if self._Token.lower()[0:2] == '0x' and len(self._Token) > 2:
	Radix = 16
	try:
	self._Token = int(self._Token, Radix)
	return True
	except ValueError:
	return False
	except TypeError:
	return False

	# Parse array: {...}
	def __GetArray(self):
	Token = '{'
	self._Idx += 1
	self.__GetNList(True)
	Token += self._LiteralToken
	if self._Idx >= self._Len or self._Expr[self._Idx] != '}':
	raise BadExpression(ERR_ARRAY_TOKEN % Token)
	Token += '}'

	# All whitespace and tabs in array are already stripped.
	IsArray = IsGuid = False
	if len(Token.split(',')) == 11 and len(Token.split(',{')) == 2 \
	and len(Token.split('},')) == 1:
	HexLen = [11, 6, 6, 5, 4, 4, 4, 4, 4, 4, 6]
	HexList = Token.split(',')
	if HexList[3].startswith('{') and \
	not [Index for Index, Hex in enumerate(HexList) if len(Hex) > HexLen[Index]]:
	IsGuid = True
	if Token.lstrip('{').rstrip('}').find('{') == -1:
	if not [Hex for Hex in Token.lstrip('{').rstrip('}').split(',') if len(Hex) > 4]:
	IsArray = True
	if not IsArray and not IsGuid:
	raise BadExpression(ERR_ARRAY_TOKEN % Token)
	self._Idx += 1
	self._Token = self._LiteralToken = Token
	return self._Token

	# Parse string, the format must be: "..."
	def __GetString(self):
	Idx = self._Idx

	# Skip left quote
	self._Idx += 1

	# Replace escape \\\", \"
	Expr = self._Expr[self._Idx:].replace('\\\\', '//').replace('\\\"', '\\\'')
	for Ch in Expr:
	self._Idx += 1
	if Ch == '"':
	break
	self._Token = self._LiteralToken = self._Expr[Idx:self._Idx]
	if not self._Token.endswith('"'):
	raise BadExpression(ERR_STRING_TOKEN % self._Token)
	self._Token = self._Token[1:-1]
	return self._Token

	# Get token that is comprised by alphanumeric, underscore or dot(used by PCD)
	# @param IsAlphaOp: Indicate if parsing general token or script operator(EQ, NE...)
	def __GetIdToken(self, IsAlphaOp = False):
	IdToken = ''
	for Ch in self._Expr[self._Idx:]:
	if not self.__IsIdChar(Ch):
	break
	self._Idx += 1
	IdToken += Ch

	self._Token = self._LiteralToken = IdToken
	if not IsAlphaOp:
	self.__ResolveToken()
	return self._Token

	# Try to resolve token
	def __ResolveToken(self):
	if not self._Token:
	raise BadExpression(ERR_EMPTY_TOKEN)

	# PCD token
	if self.PcdPattern.match(self._Token):
	if self._Token not in self._Symb:
	Ex = BadExpression(ERR_PCD_RESOLVE % self._Token)
	Ex.Pcd = self._Token
	raise Ex
	self._Token = RangeExpression(self._Symb[self._Token], self._Symb)(True, self._Depth + 1)
	if type(self._Token) != type(''):
	self._LiteralToken = hex(self._Token)
	return

	if self._Token.startswith('"'):
	self._Token = self._Token[1:-1]
	elif self._Token in ["FALSE", "false", "False"]:
	self._Token = False
	elif self._Token in ["TRUE", "true", "True"]:
	self._Token = True
	else:
	self.__IsNumberToken()

	def __GetNList(self, InArray = False):
	self._GetSingleToken()
	if not self.__IsHexLiteral():
	if InArray:
	raise BadExpression(ERR_ARRAY_ELE % self._Token)
	return self._Token

	self.__SkipWS()
	Expr = self._Expr[self._Idx:]
	if not Expr.startswith(','):
	return self._Token

	NList = self._LiteralToken
	while Expr.startswith(','):
	NList += ','
	self._Idx += 1
	self.__SkipWS()
	self._GetSingleToken()
	if not self.__IsHexLiteral():
	raise BadExpression(ERR_ARRAY_ELE % self._Token)
	NList += self._LiteralToken
	self.__SkipWS()
	Expr = self._Expr[self._Idx:]
	self._Token = self._LiteralToken = NList
	return self._Token

	def __IsHexLiteral(self):
	if self._LiteralToken.startswith('{') and \
	self._LiteralToken.endswith('}'):
	return True

	if self.HexPattern.match(self._LiteralToken):
	Token = self._LiteralToken[2:]
	Token = Token.lstrip('0')
	if not Token:
	self._LiteralToken = '0x0'
	else:
	self._LiteralToken = '0x' + Token.lower()
	return True
	return False

	def _GetToken(self):
	return self.__GetNList()

	@staticmethod
	def __IsIdChar(Ch):
	return Ch in '._/:' or Ch.isalnum()

	# Parse operand
	def _GetSingleToken(self):
	self.__SkipWS()
	Expr = self._Expr[self._Idx:]
	if Expr.startswith('L"'):
	# Skip L
	self._Idx += 1
	UStr = self.__GetString()
	self._Token = 'L"' + UStr + '"'
	return self._Token

	self._Token = ''
	if Expr:
	Ch = Expr[0]
	Match = self.RegGuidPattern.match(Expr)
	if Match and not Expr[Match.end():Match.end() + 1].isalnum() \
	and Expr[Match.end():Match.end() + 1] != '_':
	self._Idx += Match.end()
	self._Token = Expr[0:Match.end()]
	return self._Token
	elif self.__IsIdChar(Ch):
	return self.__GetIdToken()
	elif Ch == '(' or Ch == ')':
	self._Idx += 1
	self._Token = Ch
	return self._Token

	raise BadExpression(ERR_VALID_TOKEN % Expr)

	# Parse operator
	def _GetOperator(self):
	self.__SkipWS()
	LegalOpLst = ['&&', '\|\|', '!=', '==', '>=', '<='] + self.NonLetterOpLst

	self._Token = ''
	Expr = self._Expr[self._Idx:]

	# Reach end of expression
	if not Expr:
	return ''

	# Script operator: LT, GT, LE, GE, EQ, NE, and, or, xor, not
	if Expr[0].isalpha():
	return self.__GetIdToken(True)

	# Start to get regular operator: +, -, <, > ...
	if Expr[0] not in self.NonLetterOpLst:
	return ''

	OpToken = ''
	for Ch in Expr:
	if Ch in self.NonLetterOpLst:
	if '!' == Ch and OpToken:
	break
	self._Idx += 1
	OpToken += Ch
	else:
	break

	if OpToken not in LegalOpLst:
	raise BadExpression(ERR_OPERATOR_UNSUPPORT % OpToken)
	self._Token = OpToken
	return OpToken

	# Check if current token matches the operators given from OpList
	def _IsOperator(self, OpList):
	Idx = self._Idx
	self._GetOperator()
	if self._Token in OpList:
	if self._Token in self.LogicalOperators:
	self._Token = self.LogicalOperators[self._Token]
	return True
	self._Idx = Idx
	return False










	# UTRangeList()