Issue 50: Removed filename and line number from SyntaxErrors returned by...

Issue 50: Removed filename and line number from SyntaxErrors returned by invalid_marker. This change simplifies the test and paves the way for supporting PyPy.

CHANGES.txt

@@ -2,6 +2,16 @@
 CHANGES
 =======
 
+---
+1.0
+---
+
+* Issue #50: Normalized API of environment marker support. Specifically,
+  removed line number and filename from SyntaxErrors when returned from
+  `pkg_resources.invalid_marker`. Any clients depending on the specific
+  string representation of exceptions returned by that function may need to
+  be updated to account for this change.
+
 -----
 0.9.8
 -----

pkg_resources.py

@@ -1267,12 +1267,22 @@ def _pyimp():
     else:
         return 'CPython'
 
+def normalize_exception(exc):
+    """
+    Given a SyntaxError from a marker evaluation, normalize the error message:
+     - Remove indications of filename and line number.
+    """
+    exc.filename = None
+    exc.lineno = None
+    return exc
+
+
 def invalid_marker(text):
     """Validate text as a PEP 426 environment marker; return exception or False"""
     try:
         evaluate_marker(text)
     except SyntaxError:
-        return sys.exc_info()[1]
+        return normalize_exception(sys.exc_info()[1])
     return False
 
 def evaluate_marker(text, extra=None, _ops={}):

tests/api_tests.txt

@@ -341,8 +341,8 @@ Environment Markers
     >>> print(im("sys_platform"))
     Comparison or logical expression expected
 
-    >>> print(im("sys_platform=="))  # doctest: +ELLIPSIS
-    unexpected EOF while parsing (...line 1)
+    >>> print(im("sys_platform=="))
+    unexpected EOF while parsing
 
     >>> print(im("sys_platform=='win32'"))
     False
@@ -353,8 +353,8 @@ Environment Markers
     >>> print(im("(extra)"))
     Comparison or logical expression expected
 
-    >>> print(im("(extra"))  # doctest: +ELLIPSIS
-    unexpected EOF while parsing (...line 1)
+    >>> print(im("(extra"))
+    unexpected EOF while parsing
 
     >>> print(im("os.open('foo')=='y'"))
     Language feature not supported in environment markers