696 lines
19 KiB
C++
696 lines
19 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2019
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#include "td/utils/JsonBuilder.h"
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#include "td/utils/misc.h"
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#include "td/utils/ScopeGuard.h"
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#include <cstring>
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namespace td {
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StringBuilder &operator<<(StringBuilder &sb, const JsonRawString &val) {
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sb << '"';
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SCOPE_EXIT {
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sb << '"';
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};
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auto *s = val.value_.begin();
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auto len = val.value_.size();
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for (size_t pos = 0; pos < len; pos++) {
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auto ch = static_cast<unsigned char>(s[pos]);
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switch (ch) {
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case '"':
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sb << '\\' << '"';
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break;
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case '\\':
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sb << '\\' << '\\';
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break;
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case '\b':
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sb << '\\' << 'b';
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break;
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case '\f':
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sb << '\\' << 'f';
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break;
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case '\n':
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sb << '\\' << 'n';
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break;
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case '\r':
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sb << '\\' << 'r';
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break;
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case '\t':
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sb << '\\' << 't';
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break;
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default:
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if (ch <= 31) {
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sb << JsonOneChar(s[pos]);
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break;
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}
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sb << s[pos];
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break;
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}
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}
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return sb;
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}
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StringBuilder &operator<<(StringBuilder &sb, const JsonString &val) {
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sb << '"';
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SCOPE_EXIT {
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sb << '"';
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};
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auto *s = val.str_.begin();
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auto len = val.str_.size();
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for (size_t pos = 0; pos < len; pos++) {
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auto ch = static_cast<unsigned char>(s[pos]);
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switch (ch) {
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case '"':
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sb << '\\' << '"';
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break;
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case '\\':
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sb << '\\' << '\\';
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break;
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case '\b':
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sb << '\\' << 'b';
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break;
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case '\f':
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sb << '\\' << 'f';
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break;
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case '\n':
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sb << '\\' << 'n';
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break;
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case '\r':
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sb << '\\' << 'r';
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break;
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case '\t':
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sb << '\\' << 't';
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break;
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default:
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if (ch <= 31) {
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sb << JsonOneChar(s[pos]);
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break;
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}
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if (128 <= ch) {
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int a = s[pos];
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CHECK((a & 0x40) != 0);
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CHECK(pos + 1 < len);
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int b = s[++pos];
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CHECK((b & 0xc0) == 0x80);
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if ((a & 0x20) == 0) {
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CHECK((a & 0x1e) > 0);
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sb << JsonChar(((a & 0x1f) << 6) | (b & 0x3f));
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break;
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}
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CHECK(pos + 1 < len);
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int c = s[++pos];
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CHECK((c & 0xc0) == 0x80);
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if ((a & 0x10) == 0) {
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CHECK(((a & 0x0f) | (b & 0x20)) > 0);
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sb << JsonChar(((a & 0x0f) << 12) | ((b & 0x3f) << 6) | (c & 0x3f));
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break;
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}
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CHECK(pos + 1 < len);
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int d = s[++pos];
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CHECK((d & 0xc0) == 0x80);
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if ((a & 0x08) == 0) {
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CHECK(((a & 0x07) | (b & 0x30)) > 0);
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sb << JsonChar(((a & 0x07) << 18) | ((b & 0x3f) << 12) | ((c & 0x3f) << 6) | (d & 0x3f));
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break;
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}
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UNREACHABLE();
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break;
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}
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sb << s[pos];
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break;
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}
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}
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return sb;
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}
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Result<MutableSlice> json_string_decode(Parser &parser) {
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if (!parser.try_skip('"')) {
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return Status::Error("Opening '\"' expected");
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}
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auto *cur_src = parser.data().data();
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auto *end_src = parser.data().end();
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auto *end = cur_src;
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while (end < end_src && end[0] != '"') {
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if (end[0] == '\\') {
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end++;
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}
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end++;
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}
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if (end >= end_src) {
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return Status::Error("Closing '\"' not found");
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}
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parser.advance(end + 1 - cur_src);
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end_src = end;
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auto *cur_dest = cur_src;
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auto *begin_dest = cur_src;
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while (cur_src != end_src) {
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auto *slash = static_cast<char *>(std::memchr(cur_src, '\\', end_src - cur_src));
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if (slash == nullptr) {
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slash = end_src;
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}
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std::memmove(cur_dest, cur_src, slash - cur_src);
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cur_dest += slash - cur_src;
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cur_src = slash;
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if (cur_src != end_src) {
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cur_src++;
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if (cur_src == end_src) {
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// TODO UNREACHABLE();
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return Status::Error("Unexpected end of string");
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}
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switch (*cur_src) {
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case '"':
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case '\\':
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case '/':
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*cur_dest++ = *cur_src++;
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break;
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case 'b':
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*cur_dest++ = '\b';
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cur_src++;
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break;
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case 'f':
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*cur_dest++ = '\f';
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cur_src++;
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break;
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case 'n':
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*cur_dest++ = '\n';
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cur_src++;
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break;
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case 'r':
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*cur_dest++ = '\r';
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cur_src++;
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break;
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case 't':
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*cur_dest++ = '\t';
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cur_src++;
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break;
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case 'u': {
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cur_src++;
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if (cur_src + 4 > end_src) {
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return Status::Error("\\u has less than 4 symbols");
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}
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int num = 0;
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for (int i = 0; i < 4; i++, cur_src++) {
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int d = hex_to_int(*cur_src);
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if (d == 16) {
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return Status::Error("Invalid \\u -- not hex digit");
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}
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num = num * 16 + d;
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}
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if (0xD7FF < num && num < 0xE000) {
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if (cur_src + 6 <= end_src && cur_src[0] == '\\' && cur_src[1] == 'u') {
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cur_src += 2;
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int new_num = 0;
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for (int i = 0; i < 4; i++, cur_src++) {
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int d = hex_to_int(*cur_src);
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if (d == 16) {
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return Status::Error("Invalid \\u -- not hex digit");
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}
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new_num = new_num * 16 + d;
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}
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if (0xD7FF < new_num && new_num < 0xE000) {
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num = (((num & 0x3FF) << 10) | (new_num & 0x3FF)) + 0x10000;
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} else {
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cur_src -= 6;
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}
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}
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}
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if (num < 128) {
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*cur_dest++ = static_cast<char>(num);
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} else if (num < 0x800) {
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*cur_dest++ = static_cast<char>(0xc0 + (num >> 6));
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*cur_dest++ = static_cast<char>(0x80 + (num & 63));
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} else if (num <= 0xffff) {
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*cur_dest++ = static_cast<char>(0xe0 + (num >> 12));
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*cur_dest++ = static_cast<char>(0x80 + ((num >> 6) & 63));
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*cur_dest++ = static_cast<char>(0x80 + (num & 63));
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} else {
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*cur_dest++ = static_cast<char>(0xf0 + (num >> 18));
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*cur_dest++ = static_cast<char>(0x80 + ((num >> 12) & 63));
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*cur_dest++ = static_cast<char>(0x80 + ((num >> 6) & 63));
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*cur_dest++ = static_cast<char>(0x80 + (num & 63));
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}
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break;
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}
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}
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}
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}
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CHECK(cur_dest <= end_src);
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return MutableSlice(begin_dest, cur_dest);
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}
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Status json_string_skip(Parser &parser) {
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if (!parser.try_skip('"')) {
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return Status::Error("Opening '\"' expected");
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}
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auto *begin_src = parser.data().data();
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auto *cur_src = begin_src;
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auto *end_src = parser.data().end();
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auto *end = cur_src;
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while (end < end_src && *end != '"') {
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if (*end == '\\') {
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end++;
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}
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end++;
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}
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if (end >= end_src) {
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return Status::Error("Closing '\"' not found");
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}
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parser.advance(end + 1 - cur_src);
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end_src = end;
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while (cur_src != end_src) {
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auto *slash = static_cast<char *>(std::memchr(cur_src, '\\', end_src - cur_src));
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if (slash == nullptr) {
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slash = end_src;
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}
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cur_src = slash;
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if (cur_src != end_src) {
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cur_src++;
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if (cur_src == end_src) {
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// TODO UNREACHABLE();
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return Status::Error("Unexpected end of string");
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}
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switch (*cur_src) {
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case '"':
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case '\\':
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case '/':
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case 'b':
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case 'f':
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case 'n':
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case 'r':
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case 't':
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cur_src++;
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break;
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case 'u': {
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cur_src++;
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if (cur_src + 4 > end_src) {
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return Status::Error("\\u has less than 4 symbols");
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}
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int num = 0;
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for (int i = 0; i < 4; i++, cur_src++) {
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int d = hex_to_int(*cur_src);
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if (d == 16) {
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return Status::Error("Invalid \\u -- not hex digit");
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}
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num = num * 16 + d;
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}
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if (0xD7FF < num && num < 0xE000) {
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if (cur_src + 6 <= end_src && cur_src[0] == '\\' && cur_src[1] == 'u') {
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cur_src += 2;
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int new_num = 0;
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for (int i = 0; i < 4; i++, cur_src++) {
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int d = hex_to_int(*cur_src);
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if (d == 16) {
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return Status::Error("Invalid \\u -- not hex digit");
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}
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new_num = new_num * 16 + d;
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}
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if (0xD7FF < new_num && new_num < 0xE000) {
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// num = (((num & 0x3FF) << 10) | (new_num & 0x3FF)) + 0x10000;
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} else {
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cur_src -= 6;
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}
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}
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}
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break;
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}
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}
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}
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}
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return Status::OK();
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}
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Result<JsonValue> do_json_decode(Parser &parser, int32 max_depth) {
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if (max_depth < 0) {
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return Status::Error("Too big object depth");
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}
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parser.skip_whitespaces();
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switch (parser.peek_char()) {
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case 'f':
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if (parser.skip_start_with("false")) {
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return JsonValue::create_boolean(false);
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}
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return Status::Error("Token starts with 'f' -- false expected");
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case 't':
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if (parser.skip_start_with("true")) {
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return JsonValue::create_boolean(true);
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}
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return Status::Error("Token starts with 't' -- true expected");
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case 'n':
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if (parser.skip_start_with("null")) {
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return JsonValue();
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}
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return Status::Error("Token starts with 'n' -- null expected");
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case '"': {
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TRY_RESULT(slice, json_string_decode(parser));
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return JsonValue::create_string(slice);
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}
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case '[': {
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parser.skip('[');
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parser.skip_whitespaces();
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std::vector<JsonValue> res;
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if (parser.try_skip(']')) {
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return JsonValue::create_array(std::move(res));
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}
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while (true) {
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if (parser.empty()) {
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return Status::Error("Unexpected string end");
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}
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TRY_RESULT(value, do_json_decode(parser, max_depth - 1));
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res.emplace_back(std::move(value));
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parser.skip_whitespaces();
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if (parser.try_skip(']')) {
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break;
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}
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if (parser.try_skip(',')) {
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parser.skip_whitespaces();
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continue;
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}
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if (parser.empty()) {
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return Status::Error("Unexpected string end");
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}
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return Status::Error("Unexpected symbol while parsing JSON Array");
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}
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return JsonValue::create_array(std::move(res));
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}
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case '{': {
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parser.skip('{');
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parser.skip_whitespaces();
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std::vector<std::pair<MutableSlice, JsonValue> > res;
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if (parser.try_skip('}')) {
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return JsonValue::make_object(std::move(res));
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}
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while (true) {
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if (parser.empty()) {
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return Status::Error("Unexpected string end");
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}
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TRY_RESULT(key, json_string_decode(parser));
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parser.skip_whitespaces();
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if (!parser.try_skip(':')) {
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return Status::Error("':' expected");
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}
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TRY_RESULT(value, do_json_decode(parser, max_depth - 1));
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res.emplace_back(std::move(key), std::move(value));
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parser.skip_whitespaces();
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if (parser.try_skip('}')) {
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break;
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}
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if (parser.try_skip(',')) {
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parser.skip_whitespaces();
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continue;
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}
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if (parser.empty()) {
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return Status::Error("Unexpected string end");
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}
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return Status::Error("Unexpected symbol while parsing JSON Object");
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}
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return JsonValue::make_object(std::move(res));
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}
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case '-':
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case '+':
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case '.':
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9': {
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auto num = parser.read_while(
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[](char c) { return c == '-' || ('0' <= c && c <= '9') || c == 'e' || c == 'E' || c == '+' || c == '.'; });
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return JsonValue::create_number(num);
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}
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case 0:
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return Status::Error("Unexpected string end");
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default: {
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char next = parser.peek_char();
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if (0 < next && next < 127) {
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return Status::Error(PSLICE() << "Unexpected symbol '" << parser.peek_char() << "'");
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} else {
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return Status::Error("Unexpected symbol");
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}
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}
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}
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UNREACHABLE();
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}
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Status do_json_skip(Parser &parser, int32 max_depth) {
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if (max_depth < 0) {
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return Status::Error("Too big object depth");
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}
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parser.skip_whitespaces();
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switch (parser.peek_char()) {
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case 'f':
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if (parser.skip_start_with("false")) {
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return Status::OK();
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}
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return Status::Error("Starts with 'f' -- false expected");
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case 't':
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if (parser.skip_start_with("true")) {
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return Status::OK();
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}
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return Status::Error("Starts with 't' -- true expected");
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case 'n':
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if (parser.skip_start_with("null")) {
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return Status::OK();
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}
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return Status::Error("Starts with 'n' -- null expected");
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case '"': {
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return json_string_skip(parser);
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}
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case '[': {
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parser.skip('[');
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parser.skip_whitespaces();
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if (parser.try_skip(']')) {
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return Status::OK();
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}
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while (true) {
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if (parser.empty()) {
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return Status::Error("Unexpected end");
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}
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TRY_STATUS(do_json_skip(parser, max_depth - 1));
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parser.skip_whitespaces();
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if (parser.try_skip(']')) {
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break;
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}
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if (parser.try_skip(',')) {
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parser.skip_whitespaces();
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continue;
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}
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return Status::Error("Unexpected symbol");
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}
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return Status::OK();
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}
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case '{': {
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parser.skip('{');
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parser.skip_whitespaces();
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if (parser.try_skip('}')) {
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return Status::OK();
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}
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while (true) {
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if (parser.empty()) {
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return Status::Error("Unexpected end");
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}
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TRY_STATUS(json_string_skip(parser));
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parser.skip_whitespaces();
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if (!parser.try_skip(':')) {
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return Status::Error("':' expected");
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}
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TRY_STATUS(do_json_skip(parser, max_depth - 1));
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parser.skip_whitespaces();
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if (parser.try_skip('}')) {
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break;
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}
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if (parser.try_skip(',')) {
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parser.skip_whitespaces();
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continue;
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}
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return Status::Error("Unexpected symbol");
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}
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return Status::OK();
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}
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case '-':
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case '+':
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case '.':
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
|
|
case '5':
|
|
case '6':
|
|
case '7':
|
|
case '8':
|
|
case '9': {
|
|
parser.read_while(
|
|
[](char c) { return c == '-' || ('0' <= c && c <= '9') || c == 'e' || c == 'E' || c == '+' || c == '.'; });
|
|
return Status::OK();
|
|
}
|
|
case 0:
|
|
return Status::Error("Unexpected end");
|
|
default: {
|
|
char next = parser.peek_char();
|
|
if (0 < next && next < 127) {
|
|
return Status::Error(PSLICE() << "Unexpected symbol '" << parser.peek_char() << "'");
|
|
} else {
|
|
return Status::Error("Unexpected symbol");
|
|
}
|
|
}
|
|
}
|
|
return Status::Error("Can't parse");
|
|
}
|
|
|
|
Slice JsonValue::get_type_name(Type type) {
|
|
switch (type) {
|
|
case Type::Null:
|
|
return Slice("Null");
|
|
case Type::Number:
|
|
return Slice("Number");
|
|
case Type::Boolean:
|
|
return Slice("Boolean");
|
|
case Type::String:
|
|
return Slice("String");
|
|
case Type::Array:
|
|
return Slice("Array");
|
|
case Type::Object:
|
|
return Slice("Object");
|
|
default:
|
|
UNREACHABLE();
|
|
return Slice("Unknown");
|
|
}
|
|
}
|
|
|
|
bool has_json_object_field(const JsonObject &object, Slice name) {
|
|
for (auto &field_value : object) {
|
|
if (field_value.first == name) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
JsonValue get_json_object_field_force(JsonObject &object, Slice name) {
|
|
for (auto &field_value : object) {
|
|
if (field_value.first == name) {
|
|
return std::move(field_value.second);
|
|
}
|
|
}
|
|
return JsonValue();
|
|
}
|
|
|
|
Result<JsonValue> get_json_object_field(JsonObject &object, Slice name, JsonValue::Type type, bool is_optional) {
|
|
for (auto &field_value : object) {
|
|
if (field_value.first == name) {
|
|
if (type != JsonValue::Type::Null && field_value.second.type() != type) {
|
|
return Status::Error(400, PSLICE()
|
|
<< "Field \"" << name << "\" must be of type " << JsonValue::get_type_name(type));
|
|
}
|
|
|
|
return std::move(field_value.second);
|
|
}
|
|
}
|
|
if (!is_optional) {
|
|
return Status::Error(400, PSLICE() << "Can't find field \"" << name << "\"");
|
|
}
|
|
return JsonValue();
|
|
}
|
|
|
|
Result<bool> get_json_object_bool_field(JsonObject &object, Slice name, bool is_optional, bool default_value) {
|
|
TRY_RESULT(value, get_json_object_field(object, name, JsonValue::Type::Boolean, is_optional));
|
|
if (value.type() == JsonValue::Type::Null) {
|
|
return default_value;
|
|
}
|
|
return value.get_boolean();
|
|
}
|
|
|
|
Result<int32> get_json_object_int_field(JsonObject &object, Slice name, bool is_optional, int32 default_value) {
|
|
for (auto &field_value : object) {
|
|
if (field_value.first == name) {
|
|
if (field_value.second.type() == JsonValue::Type::String) {
|
|
return to_integer_safe<int32>(field_value.second.get_string());
|
|
}
|
|
if (field_value.second.type() == JsonValue::Type::Number) {
|
|
return to_integer_safe<int32>(field_value.second.get_number());
|
|
}
|
|
|
|
return Status::Error(400, PSLICE() << "Field \"" << name << "\" must be of type Number");
|
|
}
|
|
}
|
|
if (is_optional) {
|
|
return default_value;
|
|
}
|
|
return Status::Error(400, PSLICE() << "Can't find field \"" << name << "\"");
|
|
}
|
|
|
|
Result<int64> get_json_object_long_field(JsonObject &object, Slice name, bool is_optional, int64 default_value) {
|
|
for (auto &field_value : object) {
|
|
if (field_value.first == name) {
|
|
if (field_value.second.type() == JsonValue::Type::String) {
|
|
return to_integer_safe<int64>(field_value.second.get_string());
|
|
}
|
|
if (field_value.second.type() == JsonValue::Type::Number) {
|
|
return to_integer_safe<int64>(field_value.second.get_number());
|
|
}
|
|
|
|
return Status::Error(400, PSLICE() << "Field \"" << name << "\" must be a Number");
|
|
}
|
|
}
|
|
if (is_optional) {
|
|
return default_value;
|
|
}
|
|
return Status::Error(400, PSLICE() << "Can't find field \"" << name << "\"");
|
|
}
|
|
|
|
Result<double> get_json_object_double_field(JsonObject &object, Slice name, bool is_optional, double default_value) {
|
|
TRY_RESULT(value, get_json_object_field(object, name, JsonValue::Type::Number, is_optional));
|
|
if (value.type() == JsonValue::Type::Null) {
|
|
return default_value;
|
|
}
|
|
return to_double(value.get_number());
|
|
}
|
|
|
|
Result<string> get_json_object_string_field(JsonObject &object, Slice name, bool is_optional, string default_value) {
|
|
for (auto &field_value : object) {
|
|
if (field_value.first == name) {
|
|
if (field_value.second.type() == JsonValue::Type::String) {
|
|
return field_value.second.get_string().str();
|
|
}
|
|
if (field_value.second.type() == JsonValue::Type::Number) {
|
|
return field_value.second.get_number().str();
|
|
}
|
|
|
|
return Status::Error(400, PSLICE() << "Field \"" << name << "\" must be of type String");
|
|
}
|
|
}
|
|
if (is_optional) {
|
|
return default_value;
|
|
}
|
|
return Status::Error(400, PSLICE() << "Can't find field \"" << name << "\"");
|
|
}
|
|
|
|
} // namespace td
|