unittests/Support/RegexTest.cpp

   1 //===- llvm/unittest/Support/RegexTest.cpp - Regex tests --===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "llvm/Support/Regex.h"
  10 #include "llvm/ADT/SmallVector.h"
  11 #include "gtest/gtest.h"
  12 #include <cstring>
  13
  14 using namespace llvm;
  15 namespace {
  16
  17 class RegexTest : public ::testing::Test {
  18 };
  19
  20 TEST_F(RegexTest, Basics) {
  21   Regex r1("^[0-9]+$");
  22   EXPECT_TRUE(r1.match("916"));
  23   EXPECT_TRUE(r1.match("9"));
  24   EXPECT_FALSE(r1.match("9a"));
  25
  26   SmallVector<StringRef, 1> Matches;
  27   Regex r2("[0-9]+");
  28   EXPECT_TRUE(r2.match("aa216b", &Matches));
  29   EXPECT_EQ(1u, Matches.size());
  30   EXPECT_EQ("216", Matches[0].str());
  31
  32   Regex r3("[0-9]+([a-f])?:([0-9]+)");
  33   EXPECT_TRUE(r3.match("9a:513b", &Matches));
  34   EXPECT_EQ(3u, Matches.size());
  35   EXPECT_EQ("9a:513", Matches[0].str());
  36   EXPECT_EQ("a", Matches[1].str());
  37   EXPECT_EQ("513", Matches[2].str());
  38
  39   EXPECT_TRUE(r3.match("9:513b", &Matches));
  40   EXPECT_EQ(3u, Matches.size());
  41   EXPECT_EQ("9:513", Matches[0].str());
  42   EXPECT_EQ("", Matches[1].str());
  43   EXPECT_EQ("513", Matches[2].str());
  44
  45   Regex r4("a[^b]+b");
  46   std::string String="axxb";
  47   String[2] = '\0';
  48   EXPECT_FALSE(r4.match("abb"));
  49   EXPECT_TRUE(r4.match(String, &Matches));
  50   EXPECT_EQ(1u, Matches.size());
  51   EXPECT_EQ(String, Matches[0].str());
  52
  53   std::string NulPattern="X[0-9]+X([a-f])?:([0-9]+)";
  54   String="YX99a:513b";
  55   NulPattern[7] = '\0';
  56   Regex r5(NulPattern);
  57   EXPECT_FALSE(r5.match(String));
  58   EXPECT_FALSE(r5.match("X9"));
  59   String[3]='\0';
  60   EXPECT_TRUE(r5.match(String));
  61 }
  62
  63 TEST_F(RegexTest, Backreferences) {
  64   Regex r1("([a-z]+)_\\1");
  65   SmallVector<StringRef, 4> Matches;
  66   EXPECT_TRUE(r1.match("abc_abc", &Matches));
  67   EXPECT_EQ(2u, Matches.size());
  68   EXPECT_FALSE(r1.match("abc_ab", &Matches));
  69
  70   Regex r2("a([0-9])b\\1c\\1");
  71   EXPECT_TRUE(r2.match("a4b4c4", &Matches));
  72   EXPECT_EQ(2u, Matches.size());
  73   EXPECT_EQ("4", Matches[1].str());
  74   EXPECT_FALSE(r2.match("a2b2c3"));
  75
  76   Regex r3("a([0-9])([a-z])b\\1\\2");
  77   EXPECT_TRUE(r3.match("a6zb6z", &Matches));
  78   EXPECT_EQ(3u, Matches.size());
  79   EXPECT_EQ("6", Matches[1].str());
  80   EXPECT_EQ("z", Matches[2].str());
  81   EXPECT_FALSE(r3.match("a6zb6y"));
  82   EXPECT_FALSE(r3.match("a6zb7z"));
  83 }
  84
  85 TEST_F(RegexTest, Substitution) {
  86   std::string Error;
  87
  88   EXPECT_EQ("aNUMber", Regex("[0-9]+").sub("NUM", "a1234ber"));
  89
  90   // Standard Escapes
  91   EXPECT_EQ("a\\ber", Regex("[0-9]+").sub("\\\\", "a1234ber", &Error));
  92   EXPECT_EQ("", Error);
  93   EXPECT_EQ("a\nber", Regex("[0-9]+").sub("\\n", "a1234ber", &Error));
  94   EXPECT_EQ("", Error);
  95   EXPECT_EQ("a\tber", Regex("[0-9]+").sub("\\t", "a1234ber", &Error));
  96   EXPECT_EQ("", Error);
  97   EXPECT_EQ("ajber", Regex("[0-9]+").sub("\\j", "a1234ber", &Error));
  98   EXPECT_EQ("", Error);
  99
 100   EXPECT_EQ("aber", Regex("[0-9]+").sub("\\", "a1234ber", &Error));
 101   EXPECT_EQ(Error, "replacement string contained trailing backslash");
 102
 103   // Backreferences
 104   EXPECT_EQ("aa1234bber", Regex("a[0-9]+b").sub("a\\0b", "a1234ber", &Error));
 105   EXPECT_EQ("", Error);
 106
 107   EXPECT_EQ("a1234ber", Regex("a([0-9]+)b").sub("a\\1b", "a1234ber", &Error));
 108   EXPECT_EQ("", Error);
 109
 110   EXPECT_EQ("aber", Regex("a[0-9]+b").sub("a\\100b", "a1234ber", &Error));
 111   EXPECT_EQ(Error, "invalid backreference string '100'");
 112 }
 113
 114 TEST_F(RegexTest, IsLiteralERE) {
 115   EXPECT_TRUE(Regex::isLiteralERE("abc"));
 116   EXPECT_FALSE(Regex::isLiteralERE("a(bc)"));
 117   EXPECT_FALSE(Regex::isLiteralERE("^abc"));
 118   EXPECT_FALSE(Regex::isLiteralERE("abc$"));
 119   EXPECT_FALSE(Regex::isLiteralERE("a|bc"));
 120   EXPECT_FALSE(Regex::isLiteralERE("abc*"));
 121   EXPECT_FALSE(Regex::isLiteralERE("abc+"));
 122   EXPECT_FALSE(Regex::isLiteralERE("abc?"));
 123   EXPECT_FALSE(Regex::isLiteralERE("abc."));
 124   EXPECT_FALSE(Regex::isLiteralERE("a[bc]"));
 125   EXPECT_FALSE(Regex::isLiteralERE("abc\\1"));
 126   EXPECT_FALSE(Regex::isLiteralERE("abc{1,2}"));
 127 }
 128
 129 TEST_F(RegexTest, Escape) {
 130   EXPECT_EQ("a\\[bc\\]", Regex::escape("a[bc]"));
 131   EXPECT_EQ("abc\\{1\\\\,2\\}", Regex::escape("abc{1\\,2}"));
 132 }
 133
 134 TEST_F(RegexTest, IsValid) {
 135   std::string Error;
 136   EXPECT_FALSE(Regex("(foo").isValid(Error));
 137   EXPECT_EQ("parentheses not balanced", Error);
 138   EXPECT_FALSE(Regex("a[b-").isValid(Error));
 139   EXPECT_EQ("invalid character range", Error);
 140 }
 141
 142 TEST_F(RegexTest, MoveConstruct) {
 143   Regex r1("^[0-9]+$");
 144   Regex r2(std::move(r1));
 145   EXPECT_TRUE(r2.match("916"));
 146 }
 147
 148 TEST_F(RegexTest, MoveAssign) {
 149   Regex r1("^[0-9]+$");
 150   Regex r2("abc");
 151   r2 = std::move(r1);
 152   EXPECT_TRUE(r2.match("916"));
 153   std::string Error;
 154   EXPECT_FALSE(r1.isValid(Error));
 155 }
 156
 157 TEST_F(RegexTest, NoArgConstructor) {
 158   std::string Error;
 159   Regex r1;
 160   EXPECT_FALSE(r1.isValid(Error));
 161   EXPECT_EQ("invalid regular expression", Error);
 162   r1 = Regex("abc");
 163   EXPECT_TRUE(r1.isValid(Error));
 164 }
 165
 166 TEST_F(RegexTest, MatchInvalid) {
 167   Regex r1;
 168   std::string Error;
 169   EXPECT_FALSE(r1.isValid(Error));
 170   EXPECT_FALSE(r1.match("X"));
 171 }
 172
 173 // https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=3727
 174 TEST_F(RegexTest, OssFuzz3727Regression) {
 175   // Wrap in a StringRef so the NUL byte doesn't terminate the string
 176   Regex r(StringRef("[[[=GS\x00[=][", 10));
 177   std::string Error;
 178   EXPECT_FALSE(r.isValid(Error));
 179 }
 180
 181 }