Adding cython v0.20.2 in third-party.

third_party/cython/src/Cython/TestUtils.py

+import Cython.Compiler.Errors as Errors
+from Cython.CodeWriter import CodeWriter
+from Cython.Compiler.TreeFragment import TreeFragment, strip_common_indent
+from Cython.Compiler.Visitor import TreeVisitor, VisitorTransform
+from Cython.Compiler import TreePath
+
+import unittest
+import os, sys
+import tempfile
+
+
+class NodeTypeWriter(TreeVisitor):
+    def __init__(self):
+        super(NodeTypeWriter, self).__init__()
+        self._indents = 0
+        self.result = []
+
+    def visit_Node(self, node):
+        if not self.access_path:
+            name = u"(root)"
+        else:
+            tip = self.access_path[-1]
+            if tip[2] is not None:
+                name = u"%s[%d]" % tip[1:3]
+            else:
+                name = tip[1]
+
+        self.result.append(u"  " * self._indents +
+                           u"%s: %s" % (name, node.__class__.__name__))
+        self._indents += 1
+        self.visitchildren(node)
+        self._indents -= 1
+
+
+def treetypes(root):
+    """Returns a string representing the tree by class names.
+    There's a leading and trailing whitespace so that it can be
+    compared by simple string comparison while still making test
+    cases look ok."""
+    w = NodeTypeWriter()
+    w.visit(root)
+    return u"\n".join([u""] + w.result + [u""])
+
+
+class CythonTest(unittest.TestCase):
+
+    def setUp(self):
+        self.listing_file = Errors.listing_file
+        self.echo_file = Errors.echo_file
+        Errors.listing_file = Errors.echo_file = None
+
+    def tearDown(self):
+        Errors.listing_file = self.listing_file
+        Errors.echo_file = self.echo_file
+
+    def assertLines(self, expected, result):
+        "Checks that the given strings or lists of strings are equal line by line"
+        if not isinstance(expected, list): expected = expected.split(u"\n")
+        if not isinstance(result, list): result = result.split(u"\n")
+        for idx, (expected_line, result_line) in enumerate(zip(expected, result)):
+            self.assertEqual(expected_line, result_line, "Line %d:\nExp: %s\nGot: %s" % (idx, expected_line, result_line))
+        self.assertEqual(len(expected), len(result),
+            "Unmatched lines. Got:\n%s\nExpected:\n%s" % ("\n".join(expected), u"\n".join(result)))
+
+    def codeToLines(self, tree):
+        writer = CodeWriter()
+        writer.write(tree)
+        return writer.result.lines
+
+    def codeToString(self, tree):
+        return "\n".join(self.codeToLines(tree))
+
+    def assertCode(self, expected, result_tree):
+        result_lines = self.codeToLines(result_tree)
+
+        expected_lines = strip_common_indent(expected.split("\n"))
+
+        for idx, (line, expected_line) in enumerate(zip(result_lines, expected_lines)):
+            self.assertEqual(expected_line, line, "Line %d:\nGot: %s\nExp: %s" % (idx, line, expected_line))
+        self.assertEqual(len(result_lines), len(expected_lines),
+            "Unmatched lines. Got:\n%s\nExpected:\n%s" % ("\n".join(result_lines), expected))
+
+    def assertNodeExists(self, path, result_tree):
+        self.assertNotEqual(TreePath.find_first(result_tree, path), None,
+                            "Path '%s' not found in result tree" % path)
+
+    def fragment(self, code, pxds={}, pipeline=[]):
+        "Simply create a tree fragment using the name of the test-case in parse errors."
+        name = self.id()
+        if name.startswith("__main__."): name = name[len("__main__."):]
+        name = name.replace(".", "_")
+        return TreeFragment(code, name, pxds, pipeline=pipeline)
+
+    def treetypes(self, root):
+        return treetypes(root)
+
+    def should_fail(self, func, exc_type=Exception):
+        """Calls "func" and fails if it doesn't raise the right exception
+        (any exception by default). Also returns the exception in question.
+        """
+        try:
+            func()
+            self.fail("Expected an exception of type %r" % exc_type)
+        except exc_type, e:
+            self.assert_(isinstance(e, exc_type))
+            return e
+
+    def should_not_fail(self, func):
+        """Calls func and succeeds if and only if no exception is raised
+        (i.e. converts exception raising into a failed testcase). Returns
+        the return value of func."""
+        try:
+            return func()
+        except:
+            self.fail(str(sys.exc_info()[1]))
+
+
+class TransformTest(CythonTest):
+    """
+    Utility base class for transform unit tests. It is based around constructing
+    test trees (either explicitly or by parsing a Cython code string); running
+    the transform, serialize it using a customized Cython serializer (with
+    special markup for nodes that cannot be represented in Cython),
+    and do a string-comparison line-by-line of the result.
+
+    To create a test case:
+     - Call run_pipeline. The pipeline should at least contain the transform you
+       are testing; pyx should be either a string (passed to the parser to
+       create a post-parse tree) or a node representing input to pipeline.
+       The result will be a transformed result.
+
+     - Check that the tree is correct. If wanted, assertCode can be used, which
+       takes a code string as expected, and a ModuleNode in result_tree
+       (it serializes the ModuleNode to a string and compares line-by-line).
+
+    All code strings are first stripped for whitespace lines and then common
+    indentation.
+
+    Plans: One could have a pxd dictionary parameter to run_pipeline.
+    """
+
+    def run_pipeline(self, pipeline, pyx, pxds={}):
+        tree = self.fragment(pyx, pxds).root
+        # Run pipeline
+        for T in pipeline:
+            tree = T(tree)
+        return tree
+
+
+class TreeAssertVisitor(VisitorTransform):
+    # actually, a TreeVisitor would be enough, but this needs to run
+    # as part of the compiler pipeline
+
+    def visit_CompilerDirectivesNode(self, node):
+        directives = node.directives
+        if 'test_assert_path_exists' in directives:
+            for path in directives['test_assert_path_exists']:
+                if TreePath.find_first(node, path) is None:
+                    Errors.error(
+                        node.pos,
+                        "Expected path '%s' not found in result tree" % path)
+        if 'test_fail_if_path_exists' in directives:
+            for path in directives['test_fail_if_path_exists']:
+                if TreePath.find_first(node, path) is not None:
+                    Errors.error(
+                        node.pos,
+                        "Unexpected path '%s' found in result tree" %  path)
+        self.visitchildren(node)
+        return node
+
+    visit_Node = VisitorTransform.recurse_to_children
+
+
+def unpack_source_tree(tree_file, dir=None):
+    if dir is None:
+        dir = tempfile.mkdtemp()
+    header = []
+    cur_file = None
+    f = open(tree_file)
+    try:
+        lines = f.readlines()
+    finally:
+        f.close()
+    del f
+    try:
+        for line in lines:
+            if line[:5] == '#####':
+                filename = line.strip().strip('#').strip().replace('/', os.path.sep)
+                path = os.path.join(dir, filename)
+                if not os.path.exists(os.path.dirname(path)):
+                    os.makedirs(os.path.dirname(path))
+                if cur_file is not None:
+                    f, cur_file = cur_file, None
+                    f.close()
+                cur_file = open(path, 'w')
+            elif cur_file is not None:
+                cur_file.write(line)
+            elif line.strip() and not line.lstrip().startswith('#'):
+                if line.strip() not in ('"""', "'''"):
+                    header.append(line)
+    finally:
+        if cur_file is not None:
+            cur_file.close()
+    return dir, ''.join(header)