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Diffstat (limited to 'base/string_escape.cc')
-rw-r--r-- | base/string_escape.cc | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/base/string_escape.cc b/base/string_escape.cc new file mode 100644 index 0000000..018531e --- /dev/null +++ b/base/string_escape.cc @@ -0,0 +1,122 @@ +// 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 |