unittests/Support/RegexTest.cpp

   1 //===- llvm/unittest/Support/RegexTest.cpp - Regex tests --===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "gtest/gtest.h"
  11 #include "llvm/Support/Regex.h"
  12 #include "llvm/ADT/SmallVector.h"
  13 #include <cstring>
  14
  15 using namespace llvm;
  16 namespace {
  17
  18 class RegexTest : public ::testing::Test {
  19 };
  20
  21 TEST_F(RegexTest, Basics) {
  22   Regex r1("^[0-9]+$");
  23   EXPECT_TRUE(r1.match("916"));
  24   EXPECT_TRUE(r1.match("9"));
  25   EXPECT_FALSE(r1.match("9a"));
  26
  27   SmallVector<StringRef, 1> Matches;
  28   Regex r2("[0-9]+");
  29   EXPECT_TRUE(r2.match("aa216b", &Matches));
  30   EXPECT_EQ(1u, Matches.size());
  31   EXPECT_EQ("216", Matches[0].str());
  32
  33   Regex r3("[0-9]+([a-f])?:([0-9]+)");
  34   EXPECT_TRUE(r3.match("9a:513b", &Matches));
  35   EXPECT_EQ(3u, Matches.size());
  36   EXPECT_EQ("9a:513", Matches[0].str());
  37   EXPECT_EQ("a", Matches[1].str());
  38   EXPECT_EQ("513", Matches[2].str());
  39
  40   EXPECT_TRUE(r3.match("9:513b", &Matches));
  41   EXPECT_EQ(3u, Matches.size());
  42   EXPECT_EQ("9:513", Matches[0].str());
  43   EXPECT_EQ("", Matches[1].str());
  44   EXPECT_EQ("513", Matches[2].str());
  45
  46   Regex r4("a[^b]+b");
  47   std::string String="axxb";
  48   String[2] = '\0';
  49   EXPECT_FALSE(r4.match("abb"));
  50   EXPECT_TRUE(r4.match(String, &Matches));
  51   EXPECT_EQ(1u, Matches.size());
  52   EXPECT_EQ(String, Matches[0].str());
  53
  54   std::string NulPattern="X[0-9]+X([a-f])?:([0-9]+)";
  55   String="YX99a:513b";
  56   NulPattern[7] = '\0';
  57   Regex r5(NulPattern);
  58   EXPECT_FALSE(r5.match(String));
  59   EXPECT_FALSE(r5.match("X9"));
  60   String[3]='\0';
  61   EXPECT_TRUE(r5.match(String));
  62 }
  63
  64 TEST_F(RegexTest, Backreferences) {
  65   Regex r1("([a-z]+)_\\1");
  66   SmallVector<StringRef, 4> Matches;
  67   EXPECT_TRUE(r1.match("abc_abc", &Matches));
  68   EXPECT_EQ(2u, Matches.size());
  69   EXPECT_FALSE(r1.match("abc_ab", &Matches));
  70
  71   Regex r2("a([0-9])b\\1c\\1");
  72   EXPECT_TRUE(r2.match("a4b4c4", &Matches));
  73   EXPECT_EQ(2u, Matches.size());
  74   EXPECT_EQ("4", Matches[1].str());
  75   EXPECT_FALSE(r2.match("a2b2c3"));
  76
  77   Regex r3("a([0-9])([a-z])b\\1\\2");
  78   EXPECT_TRUE(r3.match("a6zb6z", &Matches));
  79   EXPECT_EQ(3u, Matches.size());
  80   EXPECT_EQ("6", Matches[1].str());
  81   EXPECT_EQ("z", Matches[2].str());
  82   EXPECT_FALSE(r3.match("a6zb6y"));
  83   EXPECT_FALSE(r3.match("a6zb7z"));
  84 }
  85
  86 TEST_F(RegexTest, Substitution) {
  87   std::string Error;
  88
  89   EXPECT_EQ("aNUMber", Regex("[0-9]+").sub("NUM", "a1234ber"));
  90
  91   // Standard Escapes
  92   EXPECT_EQ("a\\ber", Regex("[0-9]+").sub("\\\\", "a1234ber", &Error));
  93   EXPECT_EQ(Error, "");
  94   EXPECT_EQ("a\nber", Regex("[0-9]+").sub("\\n", "a1234ber", &Error));
  95   EXPECT_EQ(Error, "");
  96   EXPECT_EQ("a\tber", Regex("[0-9]+").sub("\\t", "a1234ber", &Error));
  97   EXPECT_EQ(Error, "");
  98   EXPECT_EQ("ajber", Regex("[0-9]+").sub("\\j", "a1234ber", &Error));
  99   EXPECT_EQ(Error, "");
 100
 101   EXPECT_EQ("aber", Regex("[0-9]+").sub("\\", "a1234ber", &Error));
 102   EXPECT_EQ(Error, "replacement string contained trailing backslash");
 103
 104   // Backreferences
 105   EXPECT_EQ("aa1234bber", Regex("a[0-9]+b").sub("a\\0b", "a1234ber", &Error));
 106   EXPECT_EQ(Error, "");
 107
 108   EXPECT_EQ("a1234ber", Regex("a([0-9]+)b").sub("a\\1b", "a1234ber", &Error));
 109   EXPECT_EQ(Error, "");
 110
 111   EXPECT_EQ("aber", Regex("a[0-9]+b").sub("a\\100b", "a1234ber", &Error));
 112   EXPECT_EQ(Error, "invalid backreference string '100'");
 113 }
 114
 115 }