tools/gn/string_utils_unittest.cc

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "testing/gtest/include/gtest/gtest.h"
   6 #include "tools/gn/err.h"
   7 #include "tools/gn/scope.h"
   8 #include "tools/gn/settings.h"
   9 #include "tools/gn/string_utils.h"
  10 #include "tools/gn/token.h"
  11 #include "tools/gn/value.h"
  12
  13 namespace {
  14
  15 bool CheckExpansionCase(const char* input, const char* expected, bool success) {
  16   Scope scope(static_cast<const Settings*>(nullptr));
  17   int64 one = 1;
  18   scope.SetValue("one", Value(nullptr, one), nullptr);
  19   scope.SetValue("onestring", Value(nullptr, "one"), nullptr);
  20
  21   // Construct the string token, which includes the quotes.
  22   std::string literal_string;
  23   literal_string.push_back('"');
  24   literal_string.append(input);
  25   literal_string.push_back('"');
  26   Token literal(Location(), Token::STRING, literal_string);
  27
  28   Value result(nullptr, Value::STRING);
  29   Err err;
  30   bool ret = ExpandStringLiteral(&scope, literal, &result, &err);
  31
  32   // Err and return value should agree.
  33   EXPECT_NE(ret, err.has_error());
  34
  35   if (ret != success)
  36     return false;
  37
  38   if (!success)
  39     return true;  // Don't check result on failure.
  40   return result.string_value() == expected;
  41 }
  42
  43 }  // namespace
  44
  45 TEST(StringUtils, ExpandStringLiteral) {
  46   EXPECT_TRUE(CheckExpansionCase("", "", true));
  47   EXPECT_TRUE(CheckExpansionCase("hello", "hello", true));
  48   EXPECT_TRUE(CheckExpansionCase("hello #$one", "hello #1", true));
  49   EXPECT_TRUE(CheckExpansionCase("hello #$one/two", "hello #1/two", true));
  50   EXPECT_TRUE(CheckExpansionCase("hello #${one}", "hello #1", true));
  51   EXPECT_TRUE(CheckExpansionCase("hello #${one}one", "hello #1one", true));
  52   EXPECT_TRUE(CheckExpansionCase("hello #${one}$one", "hello #11", true));
  53   EXPECT_TRUE(CheckExpansionCase("$onestring${one}$one", "one11", true));
  54
  55   // Errors
  56   EXPECT_TRUE(CheckExpansionCase("hello #$", nullptr, false));
  57   EXPECT_TRUE(CheckExpansionCase("hello #$%", nullptr, false));
  58   EXPECT_TRUE(CheckExpansionCase("hello #${", nullptr, false));
  59   EXPECT_TRUE(CheckExpansionCase("hello #${}", nullptr, false));
  60   EXPECT_TRUE(CheckExpansionCase("hello #$nonexistant", nullptr, false));
  61   EXPECT_TRUE(CheckExpansionCase("hello #${unterminated", nullptr, false));
  62
  63   // Unknown backslash values aren't special.
  64   EXPECT_TRUE(CheckExpansionCase("\\", "\\", true));
  65   EXPECT_TRUE(CheckExpansionCase("\\b", "\\b", true));
  66
  67   // Backslashes escape some special things. \"\$\\ -> "$\  Note that gtest
  68   // doesn't like this escape sequence so we have to put it out-of-line.
  69   const char* in = "\\\"\\$\\\\";
  70   const char* out = "\"$\\";
  71   EXPECT_TRUE(CheckExpansionCase(in, out, true));
  72 }