/3rd_party/llvm/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"
14using namespace llvm;
15
16namespace {
17
18std::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
25TEST(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
34TEST(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
44TEST(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
50TEST(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
77TEST(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