Allow \n in GN string literals

tools/gn/string_utils_unittest.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "tools/gn/string_utils.h"
 
 #include <stdint.h>
 #include <utility>
 
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 51 matching lines @@
   EXPECT_TRUE(CheckExpansionCase("hello", "hello", true));
   EXPECT_TRUE(CheckExpansionCase("hello #$one", "hello #1", true));
   EXPECT_TRUE(CheckExpansionCase("hello #$one/two", "hello #1/two", true));
   EXPECT_TRUE(CheckExpansionCase("hello #${one}", "hello #1", true));
   EXPECT_TRUE(CheckExpansionCase("hello #${one}one", "hello #1one", true));
   EXPECT_TRUE(CheckExpansionCase("hello #${one}$one", "hello #11", true));
   EXPECT_TRUE(CheckExpansionCase("$onestring${one}$one", "one11", true));
   EXPECT_TRUE(CheckExpansionCase("$onescope", "{\n  one = 1\n}", true));
   EXPECT_TRUE(CheckExpansionCase("$onelist", "[1]", true));
 
+  // Hex values
+  EXPECT_TRUE(CheckExpansionCase("$0x0AA", "\x0A""A", true));
+  EXPECT_TRUE(CheckExpansionCase("$0x0a$0xfF", "\x0A\xFF", true));
+
   // Errors
   EXPECT_TRUE(CheckExpansionCase("hello #$", nullptr, false));
   EXPECT_TRUE(CheckExpansionCase("hello #$%", nullptr, false));
   EXPECT_TRUE(CheckExpansionCase("hello #${", nullptr, false));
   EXPECT_TRUE(CheckExpansionCase("hello #${}", nullptr, false));
   EXPECT_TRUE(CheckExpansionCase("hello #$nonexistant", nullptr, false));
   EXPECT_TRUE(CheckExpansionCase("hello #${unterminated", nullptr, false));
+  EXPECT_TRUE(CheckExpansionCase("hex truncated: $0", nullptr, false));
+  EXPECT_TRUE(CheckExpansionCase("hex truncated: $0x", nullptr, false));
+  EXPECT_TRUE(CheckExpansionCase("hex truncated: $0x0", nullptr, false));
+  EXPECT_TRUE(CheckExpansionCase("hex with bad char: $0a", nullptr, false));
+  EXPECT_TRUE(CheckExpansionCase("hex with bad char: $0x1z", nullptr, false));
+  EXPECT_TRUE(CheckExpansionCase("hex with bad char: $0xz1", nullptr, false));
 
   // Unknown backslash values aren't special.
   EXPECT_TRUE(CheckExpansionCase("\\", "\\", true));
   EXPECT_TRUE(CheckExpansionCase("\\b", "\\b", true));
 
   // Backslashes escape some special things. \"\$\\ -> "$\  Note that gtest
   // doesn't like this escape sequence so we have to put it out-of-line.
   const char* in = "\\\"\\$\\\\";
   const char* out = "\"$\\";
   EXPECT_TRUE(CheckExpansionCase(in, out, true));
 }
 
 TEST(StringUtils, ExpandStringLiteralExpression) {
   // Accessing the scope.
   EXPECT_TRUE(CheckExpansionCase("hello #${onescope.one}", "hello #1", true));
   EXPECT_TRUE(CheckExpansionCase("hello #${onescope.two}", nullptr, false));
 
   // Accessing the list.
   EXPECT_TRUE(CheckExpansionCase("hello #${onelist[0]}", "hello #1", true));
   EXPECT_TRUE(CheckExpansionCase("hello #${onelist[1]}", nullptr, false));
 
   // Trying some other (otherwise valid) expressions should fail.
   EXPECT_TRUE(CheckExpansionCase("${1 + 2}", nullptr, false));
   EXPECT_TRUE(CheckExpansionCase("${print(1)}", nullptr, false));
 }