Give more simple message when a SyntaxError is thrown

TEST=none, no big deal. I'll get a breakpad report otherwise anyway. This is solely to *reduce* the number of breakpad stack trace that this is done.

Review URL: http://codereview.chromium.org/2885020

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@51739 0039d316-1c4b-4281-b951-d872f2087c98

gclient.py

@@ -204,7 +204,10 @@ class Dependency(GClientKeywords):
       'Var': var.Lookup,
       'deps_os': {},
     }
-    exec(deps_content, global_scope, local_scope)
+    try:
+      exec(deps_content, global_scope, local_scope)
+    except SyntaxError, e:
+      gclient_utils.SyntaxErrorToError(filepath, e)
     deps = local_scope.get('deps', {})
     # load os specific dependencies if defined.  these dependencies may
     # override or extend the values defined by the 'deps' member.
@@ -464,18 +467,7 @@ solutions = [
     try:
       exec(content, config_dict)
     except SyntaxError, e:
-      try:
-        # Try to construct a human readable error message
-        error_message = [
-            'There is a syntax error in your configuration file.',
-            'Line #%s, character %s:' % (e.lineno, e.offset),
-            '"%s"' % re.sub(r'[\r\n]*$', '', e.text) ]
-      except:
-        # Something went wrong, re-raise the original exception
-        raise e
-      else:
-        # Raise a new exception with the human readable message:
-        raise gclient_utils.Error('\n'.join(error_message))
+      gclient_utils.SyntaxErrorToError('.gclient', e)
     for s in config_dict.get('solutions', []):
       try:
         self.dependencies.append(Dependency(
@@ -538,7 +530,10 @@ solutions = [
     filename = os.path.join(self.root_dir(), self._options.entries_filename)
     if not os.path.exists(filename):
       return {}
-    exec(gclient_utils.FileRead(filename), scope)
+    try:
+      exec(gclient_utils.FileRead(filename), scope)
+    except SyntaxError, e:
+      gclient_utils.SyntaxErrorToError(filename, e)
     return scope['entries']
 
   def _EnforceRevisions(self):

gclient_utils.py

@@ -100,6 +100,23 @@ class Error(Exception):
   pass
 
 
+def SyntaxErrorToError(filename, e):
+  """Raises a gclient_utils.Error exception with the human readable message"""
+  try:
+    # Try to construct a human readable error message
+    if filename:
+      error_message = 'There is a syntax error in %s\n' % filename
+    else:
+      error_message = 'There is a syntax error\n'
+    error_message += 'Line #%s, character %s: "%s"' % (
+        e.lineno, e.offset, re.sub(r'[\r\n]*$', '', e.text))
+  except:
+    # Something went wrong, re-raise the original exception
+    raise e
+  else:
+    raise Error(error_message)
+
+
 class PrintableObject(object):
   def __str__(self):
     output = ''

tests/gclient_utils_test.py

@@ -20,6 +20,7 @@ class GclientUtilsUnittest(SuperMoxTestBase):
         'GetNamedNodeText', 'GetNodeNamedAttributeText', 'IsUsingGit',
         'PathDifference', 'ParseXML', 'PrintableObject', 'RemoveDirectory',
         'SplitUrlRevision', 'SubprocessCall', 'SubprocessCallAndFilter',
+        'SyntaxErrorToError',
         'errno', 'logging', 'os', 're', 'stat', 'subprocess', 'sys', 'time',
         'xml',
     ]