[PATCH v2 1/9] BaseTools: FdfParser and FdfParserLite share reg exp

[Jaben Carsey <jaben.carsey@intel.com>]

FdfParser can share regular expression from FdfParserLite.
reduce overlap and reduce recompile of the same expression.
v2: fix missed replacement of Pattern with shared variable

Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jaben Carsey <jaben.carsey@intel.com>
---
 BaseTools/Source/Python/Common/FdfParserLite.py | 5 +++--
 BaseTools/Source/Python/GenFds/FdfParser.py     | 4 ++--
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/BaseTools/Source/Python/Common/FdfParserLite.py b/BaseTools/Source/Python/Common/FdfParserLite.py
index df287414db6f..806fdd8aa5bb 100644
--- a/BaseTools/Source/Python/Common/FdfParserLite.py
+++ b/BaseTools/Source/Python/Common/FdfParserLite.py
@@ -47,6 +47,8 @@ InputMacroDict = {}
 # All Macro values when parsing file, not replace existing Macro
 AllMacroList = []
 
+FileExtensionPattern = re.compile(r'([a-zA-Z][a-zA-Z0-9]*)')
+
 def GetRealFileLine (File, Line):
     
     InsertedLines = 0
@@ -2842,8 +2844,7 @@ class FdfParser(object):
             
         Ext = ""
         if self.__GetNextToken():
-            Pattern = re.compile(r'([a-zA-Z][a-zA-Z0-9]*)')
-            if Pattern.match(self.__Token):
+            if FileExtensionPattern.match(self.__Token):
                 Ext = self.__Token                            
                 return '.' + Ext    
             else:
diff --git a/BaseTools/Source/Python/GenFds/FdfParser.py b/BaseTools/Source/Python/GenFds/FdfParser.py
index e35057931f03..08429cd72aff 100644
--- a/BaseTools/Source/Python/GenFds/FdfParser.py
+++ b/BaseTools/Source/Python/GenFds/FdfParser.py
@@ -60,6 +60,7 @@ from Common.LongFilePathSupport import OpenLongFilePath as open
 from Capsule import EFI_CERT_TYPE_PKCS7_GUID
 from Capsule import EFI_CERT_TYPE_RSA2048_SHA256_GUID
 from Common.RangeExpression import RangeExpression
+from Common.FdfParserLite import FileExtensionPattern
 
 ##define T_CHAR_SPACE                ' '
 ##define T_CHAR_NULL                 '\0'
@@ -3691,8 +3692,7 @@ class FdfParser:
 
         Ext = ""
         if self.__GetNextToken():
-            Pattern = re.compile(r'([a-zA-Z][a-zA-Z0-9]*)')
-            if Pattern.match(self.__Token):
+            if FileExtensionPattern.match(self.__Token):
                 Ext = self.__Token
                 return '.' + Ext
             else:
-- 
2.16.2.windows.1