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      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*>(NULL));
     17   int64 one = 1;
     18   scope.SetValue("one", Value(NULL, one), NULL);
     19   scope.SetValue("onestring", Value(NULL, "one"), NULL);
     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(NULL, 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}$one", "one11", true));
     54 
     55   // Errors
     56   EXPECT_TRUE(CheckExpansionCase("hello #$", NULL, false));
     57   EXPECT_TRUE(CheckExpansionCase("hello #$%", NULL, false));
     58   EXPECT_TRUE(CheckExpansionCase("hello #${", NULL, false));
     59   EXPECT_TRUE(CheckExpansionCase("hello #${}", NULL, false));
     60   EXPECT_TRUE(CheckExpansionCase("hello #$nonexistant", NULL, false));
     61   EXPECT_TRUE(CheckExpansionCase("hello #${unterminated", NULL, false));
     62 
     63   // Unknown backslash values aren't special.
     64   EXPECT_TRUE(CheckExpansionCase("\\", "\\", true));
     65   EXPECT_TRUE(CheckExpansionCase("\\b", "\\b", true));
     66 
     67   // Backslashes escape some special things. \"\$\\ -> "$\  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 }
     73