Move the json-related files into a separate json directory. This hopefully also

makes the naming of string_escape more clear (it's actually JSON-specific).
Move the files into the base namespace.

TEST=none
BUG=none
Review URL: http://codereview.chromium.org/316016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@29934 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 91 insertions, 0 deletions

diff --git a/base/json/string_escape.cc b/base/json/string_escape.cc
new file mode 100644
index 0000000..4e1418c
--- /dev/null
+++ b/base/json/string_escape.cc
@@ -0,0 +1,91 @@
+// Copyright (c) 2006-2008 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 "base/json/string_escape.h"
+
+#include <string>
+
+#include "base/string_util.h"
+
+namespace base {
+
+namespace {
+
+// Try to escape |c| as a "SingleEscapeCharacter" (\n, etc).  If successful,
+// returns true and appends the escape sequence to |dst|.  This isn't required
+// by the spec, but it's more readable by humans than the \uXXXX alternatives.
+template<typename CHAR>
+static bool JsonSingleEscapeChar(const CHAR c, std::string* dst) {
+  // WARNING: if you add a new case here, you need to update the reader as well.
+  // Note: \v is in the reader, but not here since the JSON spec doesn't
+  // allow it.
+  switch (c) {
+    case '\b':
+      dst->append("\\b");
+      break;
+    case '\f':
+      dst->append("\\f");
+      break;
+    case '\n':
+      dst->append("\\n");
+      break;
+    case '\r':
+      dst->append("\\r");
+      break;
+    case '\t':
+      dst->append("\\t");
+      break;
+    case '\\':
+      dst->append("\\\\");
+      break;
+    case '"':
+      dst->append("\\\"");
+      break;
+    default:
+      return false;
+  }
+  return true;
+}
+
+template <class STR>
+void JsonDoubleQuoteT(const STR& str,
+                      bool put_in_quotes,
+                      std::string* dst) {
+  if (put_in_quotes)
+    dst->push_back('"');
+
+  for (typename STR::const_iterator it = str.begin(); it != str.end(); ++it) {
+    typename ToUnsigned<typename STR::value_type>::Unsigned c = *it;
+    if (!JsonSingleEscapeChar(c, dst)) {
+      if (c < 32 || c > 126) {
+        // Technically, we could also pass through c > 126 as UTF8, but this is
+        // also optional.  It would also be a pain to implement here.
+        unsigned int as_uint = static_cast<unsigned int>(c);
+        StringAppendF(dst, "\\u%04X", as_uint);
+      } else {
+        unsigned char ascii = static_cast<unsigned char>(*it);
+        dst->push_back(ascii);
+      }
+    }
+  }
+
+  if (put_in_quotes)
+    dst->push_back('"');
+}
+
+}  // namespace
+
+void JsonDoubleQuote(const std::string& str,
+                     bool put_in_quotes,
+                     std::string* dst) {
+  JsonDoubleQuoteT(str, put_in_quotes, dst);
+}
+
+void JsonDoubleQuote(const string16& str,
+                     bool put_in_quotes,
+                     std::string* dst) {
+  JsonDoubleQuoteT(str, put_in_quotes, dst);
+}
+
+}  // namespace base