Add missing fpdfview_c_api_test.c entries.

Add a presubmit check to prevent future missing entries. Also fix an
erroneous header entry.

Change-Id: I8aeafd820de984f5af90b3e4ea428f582e82f254
Reviewed-on: https://pdfium-review.googlesource.com/21571
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>

1 files changed, 131 insertions, 0 deletions

diff --git a/testing/tools/api_check.py b/testing/tools/api_check.py
new file mode 100755
index 0000000000..29754e4b56
--- /dev/null
+++ b/testing/tools/api_check.py
@@ -0,0 +1,131 @@
+#!/usr/bin/env python
+# Copyright 2017 The PDFium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Verifies exported functions in public/*.h are in fpdfview_c_api_test.c.
+
+This script gathers a list of functions from public/*.h that contain
+FPDF_EXPORT. It then gathers a list of functions from
+fpdfsdk/fpdfview_c_api_test.c. It then verifies both lists do not contain
+duplicates, and they match each other.
+
+"""
+
+import os
+import re
+import sys
+
+def _IsValidFunctionName(function, filename):
+  if function.startswith('FPDF'):
+    return True
+  if function == 'FSDK_SetUnSpObjProcessHandler' and filename == 'fpdf_ext.h':
+    return True
+  if function.startswith('FORM_') and filename == 'fpdf_formfill.h':
+    return True
+  return False
+
+
+def _FindFunction(function_snippet, filename):
+  function_split = function_snippet.split('(')
+  assert len(function_split) == 2
+  function = function_split[0]
+  assert _IsValidFunctionName(function, filename)
+  return function
+
+
+def _GetExportsFromHeader(dirname, filename):
+  with open(os.path.join(dirname, filename)) as f:
+    contents = f.readlines()
+    look_for_function_name = False
+    functions = []
+    for line in contents:
+      if look_for_function_name:
+        look_for_function_name = False
+        split_line = line.rstrip().split(' ')
+        functions.append(_FindFunction(split_line[0], filename))
+        continue
+
+      if not line.startswith('FPDF_EXPORT '):
+        continue
+
+      # Format should be: FPDF_EXPORT return_type FPDF_CALLCONV
+      split_line = line.rstrip().split(' ')
+      callconv_index = split_line.index('FPDF_CALLCONV')
+      assert callconv_index >= 2
+      if callconv_index + 1 == len(split_line):
+        look_for_function_name = True
+        continue
+
+      functions.append(_FindFunction(split_line[callconv_index + 1], filename))
+    return functions
+
+
+def _GetFunctionsFromPublicHeaders(src_path):
+  public_path = os.path.join(src_path, 'public')
+  functions = []
+  for filename in os.listdir(public_path):
+    if filename.endswith('.h'):
+      functions.extend(_GetExportsFromHeader(public_path, filename))
+  return functions
+
+
+def _GetFunctionsFromTest(api_test_path):
+  chk_regex = re.compile('^    CHK\((.*)\);\n$')
+  with open(api_test_path) as f:
+    contents = f.readlines()
+    functions = []
+    for line in contents:
+      match = chk_regex.match(line)
+      if match:
+        functions.append(match.groups()[0])
+    return functions
+
+
+def _FindDuplicates(functions):
+  return set([f for f in functions if functions.count(f) > 1])
+
+
+def _CheckAndPrintFailures(failure_list, failure_message):
+  if not failure_list:
+    return True
+
+  print '%s:' % failure_message
+  for f in sorted(failure_list):
+    print f
+  return False
+
+
+def main():
+  script_abspath = os.path.abspath(__file__)
+  src_path = os.path.dirname(os.path.dirname(os.path.dirname(script_abspath)))
+  public_functions = _GetFunctionsFromPublicHeaders(src_path)
+
+  api_test_path = os.path.join(src_path, 'fpdfsdk', 'fpdfview_c_api_test.c')
+  test_functions = _GetFunctionsFromTest(api_test_path)
+
+  result = True
+  duplicate_public_functions = _FindDuplicates(public_functions)
+  check = _CheckAndPrintFailures(duplicate_public_functions,
+                                'Found duplicate functions in public headers')
+  result = result and check
+
+  duplicate_test_functions = _FindDuplicates(test_functions)
+  check = _CheckAndPrintFailures(duplicate_test_functions,
+                                'Found duplicate functions in API test')
+  result = result and check
+
+  public_functions_set = set(public_functions)
+  test_functions_set = set(test_functions)
+  not_tested = public_functions_set.difference(test_functions_set)
+  check = _CheckAndPrintFailures(not_tested, 'Functions not tested')
+  result = result and check
+  non_existent = test_functions_set.difference(public_functions_set)
+  check = _CheckAndPrintFailures(non_existent, 'Tested functions do not exist')
+  result = result and check
+
+  return 0 if result else 1
+
+
+if __name__ == '__main__':
+  sys.exit(main())