From: Tomas Gavenciak <gavento@matfyz.cz>
Date: Sat, 29 May 2010 16:59:57 +0000 (-0400)
Subject: New ConfigError subclasses, move re_VARNAME
X-Git-Tag: python-dummy-working~50
X-Git-Url: http://mj.ucw.cz/gitweb/?a=commitdiff_plain;h=0208316ef336f906abff8f2516f08b40e8fdf348;p=moe.git

New ConfigError subclasses, move re_VARNAME

Moved re_VARNAME to conf.py
Minor fix VARNAME checking in ConfigTree.lookup()
---

diff --git a/t/moe/conf.py b/t/moe/conf.py
index 3f145c8..1564068 100644
--- a/t/moe/conf.py
+++ b/t/moe/conf.py
@@ -26,7 +26,6 @@ TODO: Test conditions and unicode
 
 import types, itertools, re, bisect
 import logging as log
-from confparser import re_VARNAME
 
 "Allowed depth of recursion - includes ALL recursive calls, so should quite high."
 c_maxdepth = 256
@@ -34,11 +33,14 @@ c_maxdepth = 256
 "Maximum attained depth of recursion - for debug/testing"
 debug_maxdepth = 0 
 
+"Variable name regexp, dots (separators) must be separated from edges and each other."
+re_VARNAME = re.compile(r'\A([A-Za-z0-9_-]+\.)*[A-Za-z0-9_-]+\Z')
+
 def check_depth(depth):
   "Helper to check for recursion depth."
   global debug_maxdepth
   if depth > c_maxdepth:
-    raise ConfigError('Too deep recursion in config evaluation (cyclic substitution?)')
+    raise CyclicConfigError('Too deep recursion in config evaluation (cyclic substitution?)')
   if depth > debug_maxdepth:
     debug_maxdepth = depth
 
@@ -46,6 +48,15 @@ def check_depth(depth):
 class ConfigError(Exception):
   pass
 
+class UndefinedError(ConfigError):
+  pass
+
+class VariableNameError(ConfigError):
+  pass
+
+class CyclicConfigError(ConfigError):
+  pass
+
 
 class ConfigTree(object):
   """
@@ -60,11 +71,11 @@ class ConfigTree(object):
     Lookup and return a variable. 
     If not found and `create` set, check the name and transparently create a new one.
     """
-    if not key in self.variables:
-      if not create:
-	raise ConfigError('Config variable %r undefined.', key)
+    if key not in self.variables:
       if not re_VARNAME.match(key):
-	raise ConfigError('Invalid variable identifier %r in config', key)
+	raise VariableNameError('Invalid variable identifier %r in config', key)
+      if not create:
+	raise UndefinedError('Config variable %r undefined.', key)
       self.variables[key] = ConfigVar(key)
     return self.variables[key]
   def dump(self, prefix=''):
@@ -106,7 +117,7 @@ class ConfigElem(object):
       self.cached_val = self.evaluate(depth=depth+1)
       self.cached = True
     if self.cached_val == None:
-      raise ConfigError("Unable to evaluate %r."%(self.name,))
+      raise UndefinedError("Unable to evaluate %r."%(self.name,))
     return self.cached_val 
   def __str__(self):
     return self.name
diff --git a/t/moe/confparser.py b/t/moe/confparser.py
index e6ff566..e2f81b8 100644
--- a/t/moe/confparser.py
+++ b/t/moe/confparser.py
@@ -46,8 +46,7 @@ import re, types, itertools, logging as log
 import traceback
 import conf
 
-class ConfigSyntaxError(Exception):
-  # TODO: choose a better superclass
+class ConfigSyntaxError(conf.ConfigError):
   def __init__(self, msg, fname='<unknown>', line=None, column=None):
     self.msg = msg
     self.fname = fname
@@ -56,9 +55,6 @@ class ConfigSyntaxError(Exception):
   def __str__(self):
     return('ConfigSyntaxError %s:%d:%d: %s'%(self.fname, self.line, self.column, self.msg))
 
-"Variable name regexp, dots (separators) must be separated from edges and each other."
-re_VARNAME = re.compile(r'\A([A-Za-z0-9_-]+\.)*[A-Za-z0-9_-]+\Z')
-
 class ConfigParser(object):
   c_varname_sep = u'.'
   c_comment = u'#'
@@ -114,7 +110,7 @@ class ConfigParser(object):
   def next(self, l = 1):
     "Eat and return next `l` unicode characters. Raise exception on EOF."
     if not self.preread(l):
-      raise ConfigSyntaxError("Unexpected end of file")
+      self.syntax_error("Unexpected end of file")
     s = self.buf[self.bufpos:self.bufpos+l]
     self.bufpos += l
     rnl = s.rfind('\n')
@@ -260,7 +256,7 @@ class ConfigParser(object):
     while self.peek().isalnum() or self.peek() in u'-_.':
       vnl.append(self.next())
     vn = u''.join(vnl)
-    if not re_VARNAME.match(vn):
+    if not conf.re_VARNAME.match(vn):
       self.syntax_error('Invalid variable name %r', vn)
     return vn
   def p_EXPRESSION(self):