[ui/base;css] adding string template expression replacement

ui/base/template_expressions_unittest.cc

+// Copyright 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 "ui/base/template_expressions.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace ui {
+
+TEST(TemplateExpressionsTest, ReplaceTemplateExpressions) {
+  std::map<std::string, std::string> substitutions;
+  substitutions["one"] = "9a";
+  substitutions["b"] = "8b";
+  substitutions["cc"] = "7c";
+  substitutions["four"] = "6d";
+  substitutions["very long with spaces"] = "5e";
+  substitutions[""] = "4f";
+  substitutions["&"] = "3g";
+  substitutions["$"] = "2h";
+  substitutions["$$"] = "1i";
+
+  std::string formatted = ReplaceTemplateExpressions(
+      "${one}a,${b}b,${cc}c,${four}d,${very long with "
+      "spaces}e,${}f,${&}g,${$}h,${$$}i",

[Nico, 2015/07/09 19:57:46]

Add something nested like "${ab${cd}ef}" (I think that's parsed as one var
string "ab${cd" that's looked up and then "ef}" as literal)

empty var name ${}

[dschuyler, 2015/07/14 00:56:17]

Done.

+      substitutions);
+
+  EXPECT_EQ(formatted, "9aa,8bb,7cc,6dd,5ee,4ff,3gg,2hh,1ii");
+}
+
+TEST(TemplateExpressionsTest,
+     ReplaceTemplateExpressionsConsecutiveDollarSigns) {
+  std::map<std::string, std::string> substitutions;
+  substitutions["a"] = "9a";
+  substitutions["b"] = "8b";
+  substitutions["c"] = "7c";
+  EXPECT_EQ(
+      ReplaceTemplateExpressions("$${a} $$${b} $$$${c} $$", substitutions),
+      "${a} $${b} $$${c} $");
+  EXPECT_EQ(ReplaceTemplateExpressions("$12", substitutions), "12");
+  EXPECT_EQ(ReplaceTemplateExpressions("$$", substitutions), "$");
+  EXPECT_EQ(ReplaceTemplateExpressions("$", substitutions), "");
+}
+
+}  // namespace ui