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

base/strings/string_util.h

 // 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.
 //
 // This file defines utility functions for working with strings.
 
 #ifndef BASE_STRINGS_STRING_UTIL_H_
 #define BASE_STRINGS_STRING_UTIL_H_
 
 #include <ctype.h>
 #include <stdarg.h>   // va_list
 
+#include <map>
 #include <string>
 #include <vector>
 
 #include "base/base_export.h"
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_piece.h"  // For implicit conversions.
 
 namespace base {
@@ skipping 492 matching lines @@
     const std::vector<std::string>& parts, char s);
 
 // Join |parts| using |separator|.
 BASE_EXPORT std::string JoinString(
     const std::vector<std::string>& parts,
     const std::string& separator);
 BASE_EXPORT base::string16 JoinString(
     const std::vector<base::string16>& parts,
     const base::string16& separator);
 
+// Replace ${foo} in the format string with the value for the foo key in
+// |subst|. Additionally, any number of consecutive '$' characters is replaced
+// by that number less one. Eg $$ becomes $, $$$ becomes $$, etc.
+BASE_EXPORT std::string ReplaceStringPlaceholders(
+    const std::string& format_string,
+    const std::map<std::string, std::string>& subst);

[Evan Stade, 2015/07/07 17:15:16]

don't abbreviate variable names

[Dan Beam, 2015/07/07 17:26:37]

yeah, i don't like it either.  we could just fix the other occurrences that he's
being consistent with.

+
 // Replace $1-$2-$3..$9 in the format string with |a|-|b|-|c|..|i| respectively.
 // Additionally, any number of consecutive '$' characters is replaced by that
 // number less one. Eg $$->$, $$$->$$, etc. The offsets parameter here can be
 // NULL. This only allows you to use up to nine replacements.
 BASE_EXPORT base::string16 ReplaceStringPlaceholders(
     const base::string16& format_string,
     const std::vector<base::string16>& subst,
     std::vector<size_t>* offsets);
 
 BASE_EXPORT std::string ReplaceStringPlaceholders(
     const base::StringPiece& format_string,
     const std::vector<std::string>& subst,
     std::vector<size_t>* offsets);
 
 // Single-string shortcut for ReplaceStringHolders. |offset| may be NULL.
 BASE_EXPORT base::string16 ReplaceStringPlaceholders(
     const base::string16& format_string,
     const base::string16& a,
     size_t* offset);
 
 #endif  // BASE_STRINGS_STRING_UTIL_H_