Rollup merge of rust-lang#21539 - iKevinY:pythonic, r=alexcrichton

Also makes `errorck.py` and `tidy.py` compatible with Python 3.

Author: flaper87

src/etc/errorck.py

@@ -14,11 +14,10 @@
 import sys, os, re
 
 src_dir = sys.argv[1]
-
-errcode_map = { }
+errcode_map = {}
+error_re = re.compile("(E\d\d\d\d)")
 
 for (dirpath, dirnames, filenames) in os.walk(src_dir):
-
     if "src/test" in dirpath or "src/llvm" in dirpath:
         # Short circuit for fast
         continue
@@ -28,15 +27,12 @@
             continue
 
         path = os.path.join(dirpath, filename)
-        line_num = 1
-        with open(path, 'r') as f:
-            for line in f:
-
-                p = re.compile("(E\d\d\d\d)")
-                m = p.search(line)
-                if not m is None:
-                    errcode = m.group(1)
 
+        with open(path, 'r') as f:
+            for line_num, line in enumerate(f, start=1):
+                match = error_re.search(line)
+                if match:
+                    errcode = match.group(1)
                     new_record = [(errcode, path, line_num, line)]
                     existing = errcode_map.get(errcode)
                     if existing is not None:
@@ -45,26 +41,19 @@
                     else:
                         errcode_map[errcode] = new_record
 
-                line_num += 1
-
 errors = False
 all_errors = []
-for errcode in errcode_map:
-    entries = errcode_map[errcode]
-    all_errors += [entries[0][0]]
+
+for errcode, entries in errcode_map.items():
+    all_errors.append(entries[0][0])
     if len(entries) > 1:
-        print "error: duplicate error code " + errcode
+        print("error: duplicate error code " + errcode)
         for entry in entries:
-            print entry[1] + ": " + str(entry[2])
-            print entry[3]
+            print("{1}: {2}\n{3}".format(*entry))
         errors = True
 
-print str(len(errcode_map)) + " error codes"
-
-all_errors.sort()
-all_errors.reverse()
-
-print "highest error code: " + all_errors[0]
+print("{0} error codes".format(len(errcode_map)))
+print("highest error code: " + max(all_errors))
 
 if errors:
     sys.exit(1)

src/etc/licenseck.py

@@ -8,29 +8,18 @@
 # option. This file may not be copied, modified, or distributed
 # except according to those terms.
 
-license1 = """// Copyright """
-license2 = """ The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-"""
+import re
 
-license3 = """# Copyright """
-license4 = """ The Rust Project Developers. See the COPYRIGHT
-# file at the top-level directory of this distribution and at
-# http://rust-lang.org/COPYRIGHT.
-#
-# Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-# http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-# <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-# option. This file may not be copied, modified, or distributed
-# except according to those terms.
-"""
+license_re = re.compile(
+u"""(#|//) Copyright .* The Rust Project Developers. See the COPYRIGHT
+\\1 file at the top-level directory of this distribution and at
+\\1 http://rust-lang.org/COPYRIGHT.
+\\1
+\\1 Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+\\1 http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+\\1 <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+\\1 option. This file may not be copied, modified, or distributed
+\\1 except according to those terms.""")
 
 exceptions = [
     "rt/rust_android_dummy.cpp", # BSD, chromium
@@ -57,18 +46,14 @@
 
 def check_license(name, contents):
     # Whitelist check
-    for exception in exceptions:
-        if name.endswith(exception):
-            return True
+    if any(name.endswith(e) for e in exceptions):
+        return True
 
     # Xfail check
     firstlineish = contents[:100]
-    if firstlineish.find("ignore-license") != -1:
+    if "ignore-license" in firstlineish:
         return True
 
     # License check
     boilerplate = contents[:500]
-    if (boilerplate.find(license1) == -1 or boilerplate.find(license2) == -1) and \
-       (boilerplate.find(license3) == -1 or boilerplate.find(license4) == -1):
-        return False
-    return True
+    return bool(license_re.search(boilerplate))

src/etc/tidy.py

@@ -113,7 +113,7 @@ def do_license_check(name, contents):
     if current_name != "":
         do_license_check(current_name, current_contents)
 
-except UnicodeDecodeError, e:
+except UnicodeDecodeError as e:
     report_err("UTF-8 decoding error " + str(e))