unittests/ADT/TwineTest.cpp

   1 //===- TwineTest.cpp - Twine unit 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 "llvm/ADT/Twine.h"
  11 #include "llvm/ADT/SmallString.h"
  12 #include "llvm/Support/raw_ostream.h"
  13 #include "gtest/gtest.h"
  14 using namespace llvm;
  15
  16 namespace {
  17
  18 std::string repr(const Twine &Value) {
  19   std::string res;
  20   llvm::raw_string_ostream OS(res);
  21   Value.printRepr(OS);
  22   return OS.str();
  23 }
  24
  25 TEST(TwineTest, Construction) {
  26   EXPECT_EQ("", Twine().str());
  27   EXPECT_EQ("hi", Twine("hi").str());
  28   EXPECT_EQ("hi", Twine(std::string("hi")).str());
  29   EXPECT_EQ("hi", Twine(StringRef("hi")).str());
  30   EXPECT_EQ("hi", Twine(StringRef(std::string("hi"))).str());
  31   EXPECT_EQ("hi", Twine(StringRef("hithere", 2)).str());
  32 }
  33
  34 TEST(TwineTest, Numbers) {
  35   EXPECT_EQ("123", Twine(123U).str());
  36   EXPECT_EQ("123", Twine(123).str());
  37   EXPECT_EQ("-123", Twine(-123).str());
  38   EXPECT_EQ("123", Twine(123).str());
  39   EXPECT_EQ("-123", Twine(-123).str());
  40
  41   EXPECT_EQ("7b", Twine::utohexstr(123).str());
  42 }
  43
  44 TEST(TwineTest, Characters) {
  45   EXPECT_EQ("x", Twine('x').str());
  46   EXPECT_EQ("x", Twine(static_cast<unsigned char>('x')).str());
  47   EXPECT_EQ("x", Twine(static_cast<signed char>('x')).str());
  48 }
  49
  50 TEST(TwineTest, Concat) {
  51   // Check verse repr, since we care about the actual representation not just
  52   // the result.
  53
  54   // Concat with null.
  55   EXPECT_EQ("(Twine null empty)",
  56             repr(Twine("hi").concat(Twine::createNull())));
  57   EXPECT_EQ("(Twine null empty)",
  58             repr(Twine::createNull().concat(Twine("hi"))));
  59
  60   // Concat with empty.
  61   EXPECT_EQ("(Twine cstring:\"hi\" empty)",
  62             repr(Twine("hi").concat(Twine())));
  63   EXPECT_EQ("(Twine cstring:\"hi\" empty)",
  64             repr(Twine().concat(Twine("hi"))));
  65
  66   // Concatenation of unary ropes.
  67   EXPECT_EQ("(Twine cstring:\"a\" cstring:\"b\")",
  68             repr(Twine("a").concat(Twine("b"))));
  69
  70   // Concatenation of other ropes.
  71   EXPECT_EQ("(Twine rope:(Twine cstring:\"a\" cstring:\"b\") cstring:\"c\")",
  72             repr(Twine("a").concat(Twine("b")).concat(Twine("c"))));
  73   EXPECT_EQ("(Twine cstring:\"a\" rope:(Twine cstring:\"b\" cstring:\"c\"))",
  74             repr(Twine("a").concat(Twine("b").concat(Twine("c")))));
  75 }
  76
  77 TEST(TwineTest, toNullTerminatedStringRef) {
  78   SmallString<8> storage;
  79   EXPECT_EQ(0, *Twine("hello").toNullTerminatedStringRef(storage).end());
  80   EXPECT_EQ(0,
  81            *Twine(StringRef("hello")).toNullTerminatedStringRef(storage).end());
  82 }
  83
  84   // I suppose linking in the entire code generator to add a unit test to check
  85   // the code size of the concat operation is overkill... :)
  86
  87 } // end anonymous namespace