mirror of
https://github.com/ecency/ecency-mobile.git
synced 2024-12-21 04:11:50 +03:00
876 lines
22 KiB
C++
876 lines
22 KiB
C++
/*
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* Copyright 2016 Facebook, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <folly/json.h>
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#include <cassert>
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#include <boost/next_prior.hpp>
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#include <boost/algorithm/string.hpp>
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#include <folly/Conv.h>
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#include <folly/Portability.h>
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#include <folly/Range.h>
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#include <folly/String.h>
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#include <folly/Unicode.h>
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#include <folly/portability/Constexpr.h>
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namespace folly {
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//////////////////////////////////////////////////////////////////////
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namespace json {
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namespace {
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char32_t decodeUtf8(
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const unsigned char*& p,
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const unsigned char* const e,
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bool skipOnError) {
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/* The following encodings are valid, except for the 5 and 6 byte
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* combinations:
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* 0xxxxxxx
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* 110xxxxx 10xxxxxx
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* 1110xxxx 10xxxxxx 10xxxxxx
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* 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
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* 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
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* 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
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*/
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auto skip = [&] { ++p; return U'\ufffd'; };
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if (p >= e) {
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if (skipOnError) return skip();
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throw std::runtime_error("folly::decodeUtf8 empty/invalid string");
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}
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unsigned char fst = *p;
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if (!(fst & 0x80)) {
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// trivial case
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return *p++;
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}
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static const uint32_t bitMask[] = {
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(1 << 7) - 1,
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(1 << 11) - 1,
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(1 << 16) - 1,
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(1 << 21) - 1
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};
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// upper control bits are masked out later
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uint32_t d = fst;
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if ((fst & 0xC0) != 0xC0) {
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if (skipOnError) return skip();
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throw std::runtime_error(to<std::string>("folly::decodeUtf8 i=0 d=", d));
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}
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fst <<= 1;
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for (unsigned int i = 1; i != 3 && p + i < e; ++i) {
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unsigned char tmp = p[i];
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if ((tmp & 0xC0) != 0x80) {
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if (skipOnError) return skip();
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throw std::runtime_error(
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to<std::string>("folly::decodeUtf8 i=", i, " tmp=", (uint32_t)tmp));
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}
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d = (d << 6) | (tmp & 0x3F);
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fst <<= 1;
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if (!(fst & 0x80)) {
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d &= bitMask[i];
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// overlong, could have been encoded with i bytes
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if ((d & ~bitMask[i - 1]) == 0) {
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if (skipOnError) return skip();
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throw std::runtime_error(
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to<std::string>("folly::decodeUtf8 i=", i, " d=", d));
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}
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// check for surrogates only needed for 3 bytes
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if (i == 2) {
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if ((d >= 0xD800 && d <= 0xDFFF) || d > 0x10FFFF) {
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if (skipOnError) return skip();
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throw std::runtime_error(
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to<std::string>("folly::decodeUtf8 i=", i, " d=", d));
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}
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}
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p += i + 1;
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return d;
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}
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}
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if (skipOnError) return skip();
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throw std::runtime_error("folly::decodeUtf8 encoding length maxed out");
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}
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struct Printer {
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explicit Printer(
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std::string& out,
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unsigned* indentLevel,
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serialization_opts const* opts)
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: out_(out), indentLevel_(indentLevel), opts_(*opts) {}
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void operator()(dynamic const& v) const {
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switch (v.type()) {
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case dynamic::DOUBLE:
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if (!opts_.allow_nan_inf &&
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(std::isnan(v.asDouble()) || std::isinf(v.asDouble()))) {
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throw std::runtime_error("folly::toJson: JSON object value was a "
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"NaN or INF");
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}
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toAppend(v.asDouble(), &out_, opts_.double_mode, opts_.double_num_digits);
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break;
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case dynamic::INT64: {
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auto intval = v.asInt();
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if (opts_.javascript_safe) {
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// Use folly::to to check that this integer can be represented
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// as a double without loss of precision.
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intval = int64_t(to<double>(intval));
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}
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toAppend(intval, &out_);
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break;
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}
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case dynamic::BOOL:
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out_ += v.asBool() ? "true" : "false";
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break;
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case dynamic::NULLT:
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out_ += "null";
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break;
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case dynamic::STRING:
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escapeString(v.asString(), out_, opts_);
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break;
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case dynamic::OBJECT:
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printObject(v);
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break;
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case dynamic::ARRAY:
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printArray(v);
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break;
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default:
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CHECK(0) << "Bad type " << v.type();
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}
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}
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private:
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void printKV(const std::pair<const dynamic, dynamic>& p) const {
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if (!opts_.allow_non_string_keys && !p.first.isString()) {
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throw std::runtime_error("folly::toJson: JSON object key was not a "
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"string");
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}
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(*this)(p.first);
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mapColon();
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(*this)(p.second);
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}
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template <typename Iterator>
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void printKVPairs(Iterator begin, Iterator end) const {
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printKV(*begin);
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for (++begin; begin != end; ++begin) {
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out_ += ',';
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newline();
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printKV(*begin);
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}
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}
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void printObject(dynamic const& o) const {
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if (o.empty()) {
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out_ += "{}";
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return;
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}
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out_ += '{';
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indent();
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newline();
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if (opts_.sort_keys) {
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std::vector<std::pair<dynamic, dynamic>> items(
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o.items().begin(), o.items().end());
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std::sort(items.begin(), items.end());
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printKVPairs(items.begin(), items.end());
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} else {
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printKVPairs(o.items().begin(), o.items().end());
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}
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outdent();
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newline();
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out_ += '}';
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}
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void printArray(dynamic const& a) const {
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if (a.empty()) {
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out_ += "[]";
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return;
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}
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out_ += '[';
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indent();
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newline();
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(*this)(a[0]);
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for (auto& val : range(boost::next(a.begin()), a.end())) {
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out_ += ',';
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newline();
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(*this)(val);
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}
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outdent();
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newline();
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out_ += ']';
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}
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private:
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void outdent() const {
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if (indentLevel_) {
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--*indentLevel_;
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}
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}
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void indent() const {
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if (indentLevel_) {
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++*indentLevel_;
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}
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}
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void newline() const {
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if (indentLevel_) {
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out_ += to<std::string>('\n', std::string(*indentLevel_ * 2, ' '));
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}
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}
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void mapColon() const {
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out_ += indentLevel_ ? " : " : ":";
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}
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private:
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std::string& out_;
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unsigned* const indentLevel_;
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serialization_opts const& opts_;
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};
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//////////////////////////////////////////////////////////////////////
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struct ParseError : std::runtime_error {
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explicit ParseError(int line)
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: std::runtime_error(to<std::string>("json parse error on line ", line))
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{}
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explicit ParseError(int line, std::string const& context,
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std::string const& expected)
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: std::runtime_error(to<std::string>("json parse error on line ", line,
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!context.empty() ? to<std::string>(" near `", context, '\'')
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: "",
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": ", expected))
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{}
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explicit ParseError(std::string const& msg)
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: std::runtime_error("json parse error: " + msg)
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{}
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};
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// Wraps our input buffer with some helper functions.
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struct Input {
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explicit Input(StringPiece range, json::serialization_opts const* opts)
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: range_(range)
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, opts_(*opts)
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, lineNum_(0)
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{
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storeCurrent();
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}
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Input(Input const&) = delete;
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Input& operator=(Input const&) = delete;
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char const* begin() const { return range_.begin(); }
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// Parse ahead for as long as the supplied predicate is satisfied,
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// returning a range of what was skipped.
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template<class Predicate>
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StringPiece skipWhile(const Predicate& p) {
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std::size_t skipped = 0;
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for (; skipped < range_.size(); ++skipped) {
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if (!p(range_[skipped])) {
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break;
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}
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if (range_[skipped] == '\n') {
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++lineNum_;
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}
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}
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auto ret = range_.subpiece(0, skipped);
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range_.advance(skipped);
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storeCurrent();
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return ret;
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}
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StringPiece skipDigits() {
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return skipWhile([] (char c) { return c >= '0' && c <= '9'; });
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}
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StringPiece skipMinusAndDigits() {
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bool firstChar = true;
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return skipWhile([&firstChar] (char c) {
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bool result = (c >= '0' && c <= '9') || (firstChar && c == '-');
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firstChar = false;
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return result;
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});
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}
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void skipWhitespace() {
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range_ = folly::skipWhitespace(range_);
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storeCurrent();
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}
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void expect(char c) {
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if (**this != c) {
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throw ParseError(lineNum_, context(),
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to<std::string>("expected '", c, '\''));
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}
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++*this;
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}
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std::size_t size() const {
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return range_.size();
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}
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int operator*() const {
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return current_;
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}
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void operator++() {
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range_.pop_front();
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storeCurrent();
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}
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template<class T>
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T extract() {
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try {
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return to<T>(&range_);
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} catch (std::exception const& e) {
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error(e.what());
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}
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}
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bool consume(StringPiece str) {
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if (boost::starts_with(range_, str)) {
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range_.advance(str.size());
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storeCurrent();
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return true;
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}
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return false;
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}
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std::string context() const {
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return range_.subpiece(0, 16 /* arbitrary */).toString();
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}
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dynamic error(char const* what) const {
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throw ParseError(lineNum_, context(), what);
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}
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json::serialization_opts const& getOpts() {
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return opts_;
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}
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void incrementRecursionLevel() {
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if (currentRecursionLevel_ > opts_.recursion_limit) {
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error("recursion limit exceeded");
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}
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currentRecursionLevel_++;
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}
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void decrementRecursionLevel() {
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currentRecursionLevel_--;
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}
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private:
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void storeCurrent() {
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current_ = range_.empty() ? EOF : range_.front();
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}
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private:
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StringPiece range_;
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json::serialization_opts const& opts_;
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unsigned lineNum_;
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int current_;
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unsigned int currentRecursionLevel_{0};
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};
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class RecursionGuard {
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public:
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explicit RecursionGuard(Input& in) : in_(in) {
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in_.incrementRecursionLevel();
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}
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~RecursionGuard() {
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in_.decrementRecursionLevel();
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}
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private:
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Input& in_;
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};
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dynamic parseValue(Input& in);
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std::string parseString(Input& in);
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dynamic parseNumber(Input& in);
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dynamic parseObject(Input& in) {
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assert(*in == '{');
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++in;
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dynamic ret = dynamic::object;
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in.skipWhitespace();
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if (*in == '}') {
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++in;
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return ret;
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}
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for (;;) {
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if (in.getOpts().allow_trailing_comma && *in == '}') {
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break;
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}
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if (*in == '\"') { // string
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auto key = parseString(in);
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in.skipWhitespace();
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in.expect(':');
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in.skipWhitespace();
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ret.insert(std::move(key), parseValue(in));
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} else if (!in.getOpts().allow_non_string_keys) {
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in.error("expected string for object key name");
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} else {
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auto key = parseValue(in);
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in.skipWhitespace();
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in.expect(':');
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in.skipWhitespace();
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ret.insert(std::move(key), parseValue(in));
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}
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in.skipWhitespace();
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if (*in != ',') {
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break;
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}
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++in;
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in.skipWhitespace();
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}
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in.expect('}');
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return ret;
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}
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dynamic parseArray(Input& in) {
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assert(*in == '[');
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++in;
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dynamic ret = dynamic::array;
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in.skipWhitespace();
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if (*in == ']') {
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++in;
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return ret;
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}
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for (;;) {
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if (in.getOpts().allow_trailing_comma && *in == ']') {
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break;
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}
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ret.push_back(parseValue(in));
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in.skipWhitespace();
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if (*in != ',') {
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break;
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}
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++in;
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in.skipWhitespace();
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}
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in.expect(']');
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return ret;
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}
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dynamic parseNumber(Input& in) {
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bool const negative = (*in == '-');
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if (negative && in.consume("-Infinity")) {
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if (in.getOpts().parse_numbers_as_strings) {
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return "-Infinity";
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} else {
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return -std::numeric_limits<double>::infinity();
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}
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}
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auto integral = in.skipMinusAndDigits();
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if (negative && integral.size() < 2) {
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in.error("expected digits after `-'");
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}
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auto const wasE = *in == 'e' || *in == 'E';
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constexpr const char* maxInt = "9223372036854775807";
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constexpr const char* minInt = "-9223372036854775808";
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constexpr auto maxIntLen = constexpr_strlen(maxInt);
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constexpr auto minIntLen = constexpr_strlen(minInt);
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if (*in != '.' && !wasE && in.getOpts().parse_numbers_as_strings) {
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return integral;
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}
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if (*in != '.' && !wasE) {
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if (LIKELY(!in.getOpts().double_fallback || integral.size() < maxIntLen) ||
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(!negative && integral.size() == maxIntLen && integral <= maxInt) ||
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(negative && integral.size() == minIntLen && integral <= minInt)) {
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auto val = to<int64_t>(integral);
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in.skipWhitespace();
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return val;
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} else {
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auto val = to<double>(integral);
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in.skipWhitespace();
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return val;
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}
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}
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auto end = !wasE ? (++in, in.skipDigits().end()) : in.begin();
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if (*in == 'e' || *in == 'E') {
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++in;
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if (*in == '+' || *in == '-') {
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++in;
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}
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auto expPart = in.skipDigits();
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end = expPart.end();
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}
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auto fullNum = range(integral.begin(), end);
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if (in.getOpts().parse_numbers_as_strings) {
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return fullNum;
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}
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auto val = to<double>(fullNum);
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return val;
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}
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std::string decodeUnicodeEscape(Input& in) {
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auto hexVal = [&] (char c) -> unsigned {
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return c >= '0' && c <= '9' ? c - '0' :
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c >= 'a' && c <= 'f' ? c - 'a' + 10 :
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c >= 'A' && c <= 'F' ? c - 'A' + 10 :
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(in.error("invalid hex digit"), 0);
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};
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auto readHex = [&]() -> uint16_t {
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if (in.size() < 4) {
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in.error("expected 4 hex digits");
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}
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uint16_t ret = hexVal(*in) * 4096;
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++in;
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ret += hexVal(*in) * 256;
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++in;
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ret += hexVal(*in) * 16;
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++in;
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ret += hexVal(*in);
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++in;
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return ret;
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};
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/*
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* If the value encoded is in the surrogate pair range, we need to
|
|
* make sure there is another escape that we can use also.
|
|
*/
|
|
uint32_t codePoint = readHex();
|
|
if (codePoint >= 0xd800 && codePoint <= 0xdbff) {
|
|
if (!in.consume("\\u")) {
|
|
in.error("expected another unicode escape for second half of "
|
|
"surrogate pair");
|
|
}
|
|
uint16_t second = readHex();
|
|
if (second >= 0xdc00 && second <= 0xdfff) {
|
|
codePoint = 0x10000 + ((codePoint & 0x3ff) << 10) +
|
|
(second & 0x3ff);
|
|
} else {
|
|
in.error("second character in surrogate pair is invalid");
|
|
}
|
|
} else if (codePoint >= 0xdc00 && codePoint <= 0xdfff) {
|
|
in.error("invalid unicode code point (in range [0xdc00,0xdfff])");
|
|
}
|
|
|
|
return codePointToUtf8(codePoint);
|
|
}
|
|
|
|
std::string parseString(Input& in) {
|
|
assert(*in == '\"');
|
|
++in;
|
|
|
|
std::string ret;
|
|
for (;;) {
|
|
auto range = in.skipWhile(
|
|
[] (char c) { return c != '\"' && c != '\\'; }
|
|
);
|
|
ret.append(range.begin(), range.end());
|
|
|
|
if (*in == '\"') {
|
|
++in;
|
|
break;
|
|
}
|
|
if (*in == '\\') {
|
|
++in;
|
|
switch (*in) {
|
|
case '\"': ret.push_back('\"'); ++in; break;
|
|
case '\\': ret.push_back('\\'); ++in; break;
|
|
case '/': ret.push_back('/'); ++in; break;
|
|
case 'b': ret.push_back('\b'); ++in; break;
|
|
case 'f': ret.push_back('\f'); ++in; break;
|
|
case 'n': ret.push_back('\n'); ++in; break;
|
|
case 'r': ret.push_back('\r'); ++in; break;
|
|
case 't': ret.push_back('\t'); ++in; break;
|
|
case 'u': ++in; ret += decodeUnicodeEscape(in); break;
|
|
default:
|
|
in.error(to<std::string>("unknown escape ", *in, " in string").c_str());
|
|
}
|
|
continue;
|
|
}
|
|
if (*in == EOF) {
|
|
in.error("unterminated string");
|
|
}
|
|
if (!*in) {
|
|
/*
|
|
* Apparently we're actually supposed to ban all control
|
|
* characters from strings. This seems unnecessarily
|
|
* restrictive, so we're only banning zero bytes. (Since the
|
|
* string is presumed to be UTF-8 encoded it's fine to just
|
|
* check this way.)
|
|
*/
|
|
in.error("null byte in string");
|
|
}
|
|
|
|
ret.push_back(*in);
|
|
++in;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
dynamic parseValue(Input& in) {
|
|
RecursionGuard guard(in);
|
|
|
|
in.skipWhitespace();
|
|
return *in == '[' ? parseArray(in) :
|
|
*in == '{' ? parseObject(in) :
|
|
*in == '\"' ? parseString(in) :
|
|
(*in == '-' || (*in >= '0' && *in <= '9')) ? parseNumber(in) :
|
|
in.consume("true") ? true :
|
|
in.consume("false") ? false :
|
|
in.consume("null") ? nullptr :
|
|
in.consume("Infinity") ?
|
|
(in.getOpts().parse_numbers_as_strings ? (dynamic)"Infinity" :
|
|
(dynamic)std::numeric_limits<double>::infinity()) :
|
|
in.consume("NaN") ?
|
|
(in.getOpts().parse_numbers_as_strings ? (dynamic)"NaN" :
|
|
(dynamic)std::numeric_limits<double>::quiet_NaN()) :
|
|
in.error("expected json value");
|
|
}
|
|
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////////////
|
|
|
|
std::string serialize(dynamic const& dyn, serialization_opts const& opts) {
|
|
std::string ret;
|
|
unsigned indentLevel = 0;
|
|
Printer p(ret, opts.pretty_formatting ? &indentLevel : nullptr, &opts);
|
|
p(dyn);
|
|
return ret;
|
|
}
|
|
|
|
// Escape a string so that it is legal to print it in JSON text.
|
|
void escapeString(
|
|
StringPiece input,
|
|
std::string& out,
|
|
const serialization_opts& opts) {
|
|
auto hexDigit = [] (int c) -> char {
|
|
return c < 10 ? c + '0' : c - 10 + 'a';
|
|
};
|
|
|
|
out.push_back('\"');
|
|
|
|
auto* p = reinterpret_cast<const unsigned char*>(input.begin());
|
|
auto* q = reinterpret_cast<const unsigned char*>(input.begin());
|
|
auto* e = reinterpret_cast<const unsigned char*>(input.end());
|
|
|
|
while (p < e) {
|
|
// Since non-ascii encoding inherently does utf8 validation
|
|
// we explicitly validate utf8 only if non-ascii encoding is disabled.
|
|
if ((opts.validate_utf8 || opts.skip_invalid_utf8)
|
|
&& !opts.encode_non_ascii) {
|
|
// to achieve better spatial and temporal coherence
|
|
// we do utf8 validation progressively along with the
|
|
// string-escaping instead of two separate passes
|
|
|
|
// as the encoding progresses, q will stay at or ahead of p
|
|
CHECK(q >= p);
|
|
|
|
// as p catches up with q, move q forward
|
|
if (q == p) {
|
|
// calling utf8_decode has the side effect of
|
|
// checking that utf8 encodings are valid
|
|
char32_t v = decodeUtf8(q, e, opts.skip_invalid_utf8);
|
|
if (opts.skip_invalid_utf8 && v == U'\ufffd') {
|
|
out.append(u8"\ufffd");
|
|
p = q;
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
if (opts.encode_non_ascii && (*p & 0x80)) {
|
|
// note that this if condition captures utf8 chars
|
|
// with value > 127, so size > 1 byte
|
|
char32_t v = decodeUtf8(p, e, opts.skip_invalid_utf8);
|
|
out.append("\\u");
|
|
out.push_back(hexDigit(v >> 12));
|
|
out.push_back(hexDigit((v >> 8) & 0x0f));
|
|
out.push_back(hexDigit((v >> 4) & 0x0f));
|
|
out.push_back(hexDigit(v & 0x0f));
|
|
} else if (*p == '\\' || *p == '\"') {
|
|
out.push_back('\\');
|
|
out.push_back(*p++);
|
|
} else if (*p <= 0x1f) {
|
|
switch (*p) {
|
|
case '\b': out.append("\\b"); p++; break;
|
|
case '\f': out.append("\\f"); p++; break;
|
|
case '\n': out.append("\\n"); p++; break;
|
|
case '\r': out.append("\\r"); p++; break;
|
|
case '\t': out.append("\\t"); p++; break;
|
|
default:
|
|
// note that this if condition captures non readable chars
|
|
// with value < 32, so size = 1 byte (e.g control chars).
|
|
out.append("\\u00");
|
|
out.push_back(hexDigit((*p & 0xf0) >> 4));
|
|
out.push_back(hexDigit(*p & 0xf));
|
|
p++;
|
|
}
|
|
} else {
|
|
out.push_back(*p++);
|
|
}
|
|
}
|
|
|
|
out.push_back('\"');
|
|
}
|
|
|
|
std::string stripComments(StringPiece jsonC) {
|
|
std::string result;
|
|
enum class State {
|
|
None,
|
|
InString,
|
|
InlineComment,
|
|
LineComment
|
|
} state = State::None;
|
|
|
|
for (size_t i = 0; i < jsonC.size(); ++i) {
|
|
auto s = jsonC.subpiece(i);
|
|
switch (state) {
|
|
case State::None:
|
|
if (s.startsWith("/*")) {
|
|
state = State::InlineComment;
|
|
++i;
|
|
continue;
|
|
} else if (s.startsWith("//")) {
|
|
state = State::LineComment;
|
|
++i;
|
|
continue;
|
|
} else if (s[0] == '\"') {
|
|
state = State::InString;
|
|
}
|
|
result.push_back(s[0]);
|
|
break;
|
|
case State::InString:
|
|
if (s[0] == '\\') {
|
|
if (UNLIKELY(s.size() == 1)) {
|
|
throw std::logic_error("Invalid JSONC: string is not terminated");
|
|
}
|
|
result.push_back(s[0]);
|
|
result.push_back(s[1]);
|
|
++i;
|
|
continue;
|
|
} else if (s[0] == '\"') {
|
|
state = State::None;
|
|
}
|
|
result.push_back(s[0]);
|
|
break;
|
|
case State::InlineComment:
|
|
if (s.startsWith("*/")) {
|
|
state = State::None;
|
|
++i;
|
|
}
|
|
break;
|
|
case State::LineComment:
|
|
if (s[0] == '\n') {
|
|
// skip the line break. It doesn't matter.
|
|
state = State::None;
|
|
}
|
|
break;
|
|
default:
|
|
throw std::logic_error("Unknown comment state");
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////////////
|
|
|
|
dynamic parseJson(StringPiece range) {
|
|
return parseJson(range, json::serialization_opts());
|
|
}
|
|
|
|
dynamic parseJson(
|
|
StringPiece range,
|
|
json::serialization_opts const& opts) {
|
|
|
|
json::Input in(range, &opts);
|
|
|
|
auto ret = parseValue(in);
|
|
in.skipWhitespace();
|
|
if (in.size() && *in != '\0') {
|
|
in.error("parsing didn't consume all input");
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
std::string toJson(dynamic const& dyn) {
|
|
return json::serialize(dyn, json::serialization_opts());
|
|
}
|
|
|
|
std::string toPrettyJson(dynamic const& dyn) {
|
|
json::serialization_opts opts;
|
|
opts.pretty_formatting = true;
|
|
return json::serialize(dyn, opts);
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////////////
|
|
// dynamic::print_as_pseudo_json() is implemented here for header
|
|
// ordering reasons (most of the dynamic implementation is in
|
|
// dynamic-inl.h, which we don't want to include json.h).
|
|
|
|
void dynamic::print_as_pseudo_json(std::ostream& out) const {
|
|
json::serialization_opts opts;
|
|
opts.allow_non_string_keys = true;
|
|
opts.allow_nan_inf = true;
|
|
out << json::serialize(*this, opts);
|
|
}
|
|
|
|
void PrintTo(const dynamic& dyn, std::ostream* os) {
|
|
json::serialization_opts opts;
|
|
opts.allow_nan_inf = true;
|
|
opts.allow_non_string_keys = true;
|
|
opts.pretty_formatting = true;
|
|
opts.sort_keys = true;
|
|
*os << json::serialize(dyn, opts);
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////////////
|
|
|
|
}
|