Replace RE2 import with a dependency

third_party/re2/re2/testing/random_test.cc

-// Copyright 2008 The RE2 Authors.  All Rights Reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Random testing of regular expression matching.
-
-#include <stdio.h>
-#include "util/test.h"
-#include "re2/testing/exhaustive_tester.h"
-
-DEFINE_int32(regexpseed, 404, "Random regexp seed.");
-DEFINE_int32(regexpcount, 100, "How many random regexps to generate.");
-DEFINE_int32(stringseed, 200, "Random string seed.");
-DEFINE_int32(stringcount, 100, "How many random strings to generate.");
-
-namespace re2 {
-
-// Runs a random test on the given parameters.
-// (Always uses the same random seeds for reproducibility.
-// Can give different seeds on command line.)
-static void RandomTest(int maxatoms, int maxops,
-                       const vector<string>& alphabet,
-                       const vector<string>& ops,
-                       int maxstrlen, const vector<string>& stralphabet,
-                       const string& wrapper) {
-  // Limit to smaller test cases in debug mode,
-  // because everything is so much slower.
-  if (RE2_DEBUG_MODE) {
-    maxatoms--;
-    maxops--;
-    maxstrlen /= 2;
-  }
-
-  ExhaustiveTester t(maxatoms, maxops, alphabet, ops,
-                     maxstrlen, stralphabet, wrapper, "");
-  t.RandomStrings(FLAGS_stringseed, FLAGS_stringcount);
-  t.GenerateRandom(FLAGS_regexpseed, FLAGS_regexpcount);
-  printf("%d regexps, %d tests, %d failures [%d/%d str]\n",
-         t.regexps(), t.tests(), t.failures(), maxstrlen, (int)stralphabet.size());
-  EXPECT_EQ(0, t.failures());
-}
-
-// Tests random small regexps involving literals and egrep operators.
-TEST(Random, SmallEgrepLiterals) {
-  RandomTest(5, 5, Explode("abc."), RegexpGenerator::EgrepOps(),
-             15, Explode("abc"),
-             "");
-}
-
-// Tests random bigger regexps involving literals and egrep operators.
-TEST(Random, BigEgrepLiterals) {
-  RandomTest(10, 10, Explode("abc."), RegexpGenerator::EgrepOps(),
-             15, Explode("abc"),
-             "");
-}
-
-// Tests random small regexps involving literals, capturing parens,
-// and egrep operators.
-TEST(Random, SmallEgrepCaptures) {
-  RandomTest(5, 5, Split(" ", "a (b) ."), RegexpGenerator::EgrepOps(),
-             15, Explode("abc"),
-             "");
-}
-
-// Tests random bigger regexps involving literals, capturing parens,
-// and egrep operators.
-TEST(Random, BigEgrepCaptures) {
-  RandomTest(10, 10, Split(" ", "a (b) ."), RegexpGenerator::EgrepOps(),
-             15, Explode("abc"),
-             "");
-}
-
-// Tests random large complicated expressions, using all the possible
-// operators, some literals, some parenthesized literals, and predefined
-// character classes like \d.  (Adding larger character classes would
-// make for too many possibilities.)
-TEST(Random, Complicated) {
-  vector<string> ops = Split(" ",
-    "%s%s %s|%s %s* %s*? %s+ %s+? %s? %s?? "
-    "%s{0} %s{0,} %s{1} %s{1,} %s{0,1} %s{0,2} %s{1,2} "
-    "%s{2} %s{2,} %s{3,4} %s{4,5}");
-
-  // Use (?:\b) and (?:\B) instead of \b and \B,
-  // because PCRE rejects \b* but accepts (?:\b)*.
-  // Ditto ^ and $.
-  vector<string> atoms = Split(" ",
-    ". (?:^) (?:$) \\a \\f \\n \\r \\t \\v "
-    "\\d \\D \\s \\S \\w \\W (?:\\b) (?:\\B) "
-    "a (a) b c - \\\\");
-  vector<string> alphabet = Explode("abc123\001\002\003\t\r\n\v\f\a");
-  RandomTest(10, 10, atoms, ops, 20, alphabet, "");
-}
-
-}  // namespace re2
-