106 lines
2.8 KiB
C++
106 lines
2.8 KiB
C++
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// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/json/string_escape.h"
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#include <string>
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#include "base/strings/string_util.h"
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#include "base/strings/stringprintf.h"
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namespace base {
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namespace {
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// Try to escape |c| as a "SingleEscapeCharacter" (\n, etc). If successful,
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// returns true and appends the escape sequence to |dst|. This isn't required
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// by the spec, but it's more readable by humans than the \uXXXX alternatives.
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template<typename CHAR>
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static bool JsonSingleEscapeChar(const CHAR c, std::string* dst) {
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// WARNING: if you add a new case here, you need to update the reader as well.
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// Note: \v is in the reader, but not here since the JSON spec doesn't
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// allow it.
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switch (c) {
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case '\b':
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dst->append("\\b");
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break;
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case '\f':
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dst->append("\\f");
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break;
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case '\n':
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dst->append("\\n");
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break;
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case '\r':
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dst->append("\\r");
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break;
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case '\t':
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dst->append("\\t");
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break;
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case '\\':
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dst->append("\\\\");
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break;
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case '"':
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dst->append("\\\"");
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break;
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default:
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return false;
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}
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return true;
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}
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template <class STR>
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void JsonDoubleQuoteT(const STR& str,
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bool put_in_quotes,
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std::string* dst) {
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if (put_in_quotes)
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dst->push_back('"');
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for (typename STR::const_iterator it = str.begin(); it != str.end(); ++it) {
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typename ToUnsigned<typename STR::value_type>::Unsigned c = *it;
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if (!JsonSingleEscapeChar(c, dst)) {
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if (c < 32 || c > 126 || c == '<' || c == '>') {
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// 1. Escaping <, > to prevent script execution.
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// 2. Technically, we could also pass through c > 126 as UTF8, but this
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// is also optional. It would also be a pain to implement here.
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unsigned int as_uint = static_cast<unsigned int>(c);
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base::StringAppendF(dst, "\\u%04X", as_uint);
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} else {
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unsigned char ascii = static_cast<unsigned char>(*it);
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dst->push_back(ascii);
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}
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}
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}
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if (put_in_quotes)
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dst->push_back('"');
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}
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} // namespace
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void JsonDoubleQuote(const std::string& str,
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bool put_in_quotes,
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std::string* dst) {
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JsonDoubleQuoteT(str, put_in_quotes, dst);
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}
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std::string GetDoubleQuotedJson(const std::string& str) {
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std::string dst;
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JsonDoubleQuote(str, true, &dst);
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return dst;
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}
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void JsonDoubleQuote(const string16& str,
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bool put_in_quotes,
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std::string* dst) {
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JsonDoubleQuoteT(str, put_in_quotes, dst);
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}
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std::string GetDoubleQuotedJson(const string16& str) {
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std::string dst;
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JsonDoubleQuote(str, true, &dst);
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return dst;
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}
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} // namespace base
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