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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "base/string_escape.h"
+
+#include <string>
+
+#include "base/string_util.h"
+
+namespace string_escape {
+
+// Try to escape |c| as a "SingleEscapeCharacter" (\n, etc). If successful,
+// returns true and appends the escape sequence to |dst|.
+template<typename CHAR>
+static bool JavascriptSingleEscapeChar(const CHAR c, std::string* dst) {
+ 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 '\v':
+ dst->append("\\v");
+ break;
+ case '\\':
+ dst->append("\\\\");
+ break;
+ case '"':
+ dst->append("\\\"");
+ break;
+ default:
+ return false;
+ }
+ return true;
+}
+
+void JavascriptDoubleQuote(const std::wstring& str,
+ bool put_in_quotes,
+ std::string* dst) {
+ if (put_in_quotes)
+ dst->push_back('"');
+
+ for (std::wstring::const_iterator it = str.begin(); it != str.end(); ++it) {
+ wchar_t c = *it;
+ if (!JavascriptSingleEscapeChar(c, dst)) {
+ if (c > 255) {
+ // Non-ascii values need to be unicode dst->
+ // TODO(tc): Some unicode values are handled specially. See
+ // spidermonkey code.
+ StringAppendF(dst, "\\u%04X", c);
+ } else if (c < 32 || c > 126) {
+ // Spidermonkey hex escapes these values.
+ StringAppendF(dst, "\\x%02X", c);
+ } else {
+ dst->push_back(static_cast<char>(c));
+ }
+ }
+ }
+
+ if (put_in_quotes)
+ dst->push_back('"');
+}
+
+void JavascriptDoubleQuote(const std::string& str,
+ bool put_in_quotes,
+ std::string* dst) {
+ if (put_in_quotes)
+ dst->push_back('"');
+
+ for (std::string::const_iterator it = str.begin(); it != str.end(); ++it) {
+ unsigned char c = *it;
+ if (!JavascriptSingleEscapeChar(c, dst)) {
+ // Hex encode if the character is non-printable 7bit ascii
+ if (c < 32 || c == 127) {
+ StringAppendF(dst, "\\x%02X", c);
+ } else {
+ dst->push_back(static_cast<char>(c));
+ }
+ }
+ }
+
+ if (put_in_quotes)
+ dst->push_back('"');
+}
+
+} // namespace string_escape