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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
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