From de8fd9328e9deb0d1ec596d7486686ea3cb688c2 Mon Sep 17 00:00:00 2001
From: "Felix (xq) Queißner" <git@mq32.de>
Date: Tue, 9 Jun 2020 18:27:38 +0200
Subject: Includes cmark markdown parser library.

---
 lib/cmark/test/pathological_tests.py | 169 +++++++++++++++++++++++++++++++++++
 1 file changed, 169 insertions(+)
 create mode 100644 lib/cmark/test/pathological_tests.py

(limited to 'lib/cmark/test/pathological_tests.py')

diff --git a/lib/cmark/test/pathological_tests.py b/lib/cmark/test/pathological_tests.py
new file mode 100644
index 0000000..76cc913
--- /dev/null
+++ b/lib/cmark/test/pathological_tests.py
@@ -0,0 +1,169 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+import re
+import argparse
+import sys
+import platform
+import itertools
+import multiprocessing
+import time
+from cmark import CMark
+
+TIMEOUT = 5
+
+parser = argparse.ArgumentParser(description='Run cmark tests.')
+parser.add_argument('--program', dest='program', nargs='?', default=None,
+        help='program to test')
+parser.add_argument('--library-dir', dest='library_dir', nargs='?',
+        default=None, help='directory containing dynamic library')
+args = parser.parse_args(sys.argv[1:])
+
+allowed_failures = {"many references": True}
+
+cmark = CMark(prog=args.program, library_dir=args.library_dir)
+
+def hash_collisions():
+    REFMAP_SIZE = 16
+    COUNT = 50000
+
+    def badhash(ref):
+        h = 0
+        for c in ref:
+            a = (h << 6) & 0xFFFFFFFF
+            b = (h << 16) & 0xFFFFFFFF
+            h = ord(c) + a + b - h
+            h = h & 0xFFFFFFFF
+
+        return (h % REFMAP_SIZE) == 0
+
+    keys = ("x%d" % i for i in itertools.count())
+    collisions = itertools.islice((k for k in keys if badhash(k)), COUNT)
+    bad_key = next(collisions)
+
+    document = ''.join("[%s]: /url\n\n[%s]\n\n" % (key, bad_key) for key in collisions)
+
+    return document, re.compile("(<p>\[%s\]</p>\n){%d}" % (bad_key, COUNT-1))
+
+
+# list of pairs consisting of input and a regex that must match the output.
+pathological = {
+    # note - some pythons have limit of 65535 for {num-matches} in re.
+    "nested strong emph":
+                (("*a **a " * 65000) + "b" + (" a** a*" * 65000),
+                 re.compile("(<em>a <strong>a ){65000}b( a</strong> a</em>){65000}")),
+    "many emph closers with no openers":
+                 (("a_ " * 65000),
+                  re.compile("(a[_] ){64999}a_")),
+    "many emph openers with no closers":
+                 (("_a " * 65000),
+                  re.compile("(_a ){64999}_a")),
+    "many link closers with no openers":
+                 (("a]" * 65000),
+                  re.compile("(a\]){65000}")),
+    "many link openers with no closers":
+                 (("[a" * 65000),
+                  re.compile("(\[a){65000}")),
+    "mismatched openers and closers":
+                 (("*a_ " * 50000),
+                  re.compile("([*]a[_] ){49999}[*]a_")),
+    "openers and closers multiple of 3":
+                 (("a**b" + ("c* " * 50000)),
+                  re.compile("a[*][*]b(c[*] ){49999}c[*]")),
+    "link openers and emph closers":
+                 (("[ a_" * 50000),
+                  re.compile("(\[ a_){50000}")),
+    "pattern [ (]( repeated":
+                 (("[ (](" * 80000),
+                  re.compile("(\[ \(\]\(){80000}")),
+    "hard link/emph case":
+                 ("**x [a*b**c*](d)",
+                  re.compile("\\*\\*x <a href=\"d\">a<em>b\\*\\*c</em></a>")),
+    "nested brackets":
+                 (("[" * 50000) + "a" + ("]" * 50000),
+                  re.compile("\[{50000}a\]{50000}")),
+    "nested block quotes":
+                 ((("> " * 50000) + "a"),
+                  re.compile("(<blockquote>\n){50000}")),
+    "deeply nested lists":
+                 ("".join(map(lambda x: ("  " * x + "* a\n"), range(0,1000))),
+                  re.compile("<ul>\n(<li>a\n<ul>\n){999}<li>a</li>\n</ul>\n(</li>\n</ul>\n){999}")),
+    "U+0000 in input":
+                 ("abc\u0000de\u0000",
+                  re.compile("abc\ufffd?de\ufffd?")),
+    "backticks":
+                 ("".join(map(lambda x: ("e" + "`" * x), range(1,5000))),
+                  re.compile("^<p>[e`]*</p>\n$")),
+    "unclosed links A":
+                 ("[a](<b" * 30000,
+                  re.compile("(\[a\]\(&lt;b){30000}")),
+    "unclosed links B":
+                 ("[a](b" * 30000,
+                  re.compile("(\[a\]\(b){30000}")),
+    "reference collisions": hash_collisions()
+#    "many references":
+#                 ("".join(map(lambda x: ("[" + str(x) + "]: u\n"), range(1,5000 * 16))) + "[0] " * 5000,
+#                  re.compile("(\[0\] ){4999}"))
+    }
+
+whitespace_re = re.compile('/s+/')
+
+results = {'passed': [], 'errored': [], 'failed': [], 'ignored': []}
+
+def run_pathological_test(description, results):
+    (inp, regex) = pathological[description]
+    [rc, actual, err] = cmark.to_html(inp)
+    extra = ""
+    if rc != 0:
+        print(description, '[ERRORED (return code %d)]' %rc)
+        print(err)
+        if allowed_failures[description]:
+            results['ignored'].append(description)
+        else:
+            results['errored'].append(description)
+    elif regex.search(actual):
+        print(description, '[PASSED]')
+        results['passed'].append(description)
+    else:
+        print(description, '[FAILED]')
+        print(repr(actual))
+        if allowed_failures[description]:
+            results['ignored'].append(description)
+        else:
+            results['failed'].append(description)
+
+def run_tests():
+    print("Testing pathological cases:")
+    for description in pathological:
+        p = multiprocessing.Process(target=run_pathological_test,
+                  args=(description, results,))
+        p.start()
+        # wait TIMEOUT seconds or until it finishes
+        p.join(TIMEOUT)
+        # kill it if still active
+        if p.is_alive():
+            print(description, '[TIMEOUT]')
+            if allowed_failures[description]:
+                results['ignored'].append(description)
+            else:
+                results['errored'].append(description)
+            p.terminate()
+            p.join()
+
+    passed  = len(results['passed'])
+    failed  = len(results['failed'])
+    errored = len(results['errored'])
+    ignored = len(results['ignored'])
+
+    print("%d passed, %d failed, %d errored" % (passed, failed, errored))
+    if ignored > 0:
+        print("Ignoring these allowed failures:")
+        for x in results['ignored']:
+            print(x)
+    if failed == 0 and errored == 0:
+        exit(0)
+    else:
+        exit(1)
+
+if __name__ == "__main__":
+    run_tests()
-- 
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