Buffet: Move buffet over to platform2 from src/platform/buffet.

This change also open-sources buffet. The only change in this CL
is the removal of the Makefile and addition of the buffet.gyp file.

BUG=chromium:355180
TEST=USE=buffet emerge-gizmo platform2

Change-Id: Ibf8d3ac3f38313f82a9c07d79932b6f30130f9c5
diff --git a/buffet/string_utils.cc b/buffet/string_utils.cc
new file mode 100644
index 0000000..49a7d84
--- /dev/null
+++ b/buffet/string_utils.cc
@@ -0,0 +1,87 @@
+// Copyright 2014 The Chromium OS 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 "buffet/string_utils.h"
+
+#include <algorithm>
+#include <string.h>
+#include <base/strings/string_util.h>
+
+namespace chromeos {
+namespace string_utils {
+
+std::vector<std::string> Split(std::string const& str,
+                               char delimiter,
+                               bool trim_whitespaces,
+                               bool purge_empty_strings) {
+  std::vector<std::string> tokens;
+  if (delimiter == 0)
+    return tokens;
+
+  char const* sz = str.c_str();
+  if (sz) {
+    char const* szNext = strchr(sz, delimiter);
+    while (szNext) {
+      if (szNext != sz || !purge_empty_strings)
+        tokens.emplace_back(sz, szNext - sz);
+      sz = szNext + 1;
+      szNext = strchr(sz, delimiter);
+    }
+    if (*sz != 0 || !purge_empty_strings)
+      tokens.emplace_back(sz);
+  }
+
+  if (trim_whitespaces) {
+    std::for_each(tokens.begin(), tokens.end(), [](std::string& str) {
+      TrimWhitespaceASCII(str, TRIM_ALL, &str); });
+  }
+
+  return tokens;
+}
+
+std::pair<std::string, std::string> SplitAtFirst(std::string const& str,
+                                                 char delimiter,
+                                                 bool trim_whitespaces) {
+  std::pair<std::string, std::string> pair;
+  if (delimiter == 0)
+    return pair;
+
+  char const* sz = str.c_str();
+  char const* szNext = strchr(sz, delimiter);
+  if (szNext) {
+    pair.first = std::string(sz, szNext);
+    pair.second = std::string(szNext + 1);
+  } else {
+    pair.first = str;
+  }
+
+  if (trim_whitespaces) {
+    TrimWhitespaceASCII(pair.first, TRIM_ALL, &pair.first);
+    TrimWhitespaceASCII(pair.second, TRIM_ALL, &pair.second);
+  }
+
+  return pair;
+}
+
+std::string Join(char delimiter, std::vector<std::string> const& strings) {
+  return JoinString(strings, delimiter);
+}
+
+std::string Join(std::string const& delimiter,
+                 std::vector<std::string> const& strings) {
+  return JoinString(strings, delimiter);
+}
+
+std::string Join(char delimiter,
+                 std::string const& str1, std::string const& str2) {
+  return str1 + delimiter + str2;
+}
+
+std::string Join(std::string const& delimiter,
+                 std::string const& str1, std::string const& str2) {
+  return str1 + delimiter + str2;
+}
+
+} // namespace string_utils
+} // namespace chromeos