67 lines
2.5 KiB
C++
67 lines
2.5 KiB
C++
#pragma once
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#ifdef SIMDJSON_COMPETITION_SAJSON
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#include "find_tweet.h"
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namespace find_tweet {
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struct sajson {
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using StringType=std::string_view;
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size_t ast_buffer_size{0};
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size_t *ast_buffer{nullptr};
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simdjson_really_inline std::string_view get_string_view(const ::sajson::value &obj, std::string_view key) {
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auto val = obj.get_value_of_key({key.data(), key.length()});
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if (val.get_type() != ::sajson::TYPE_STRING) { throw "field is not a string"; }
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return { val.as_cstring(), val.get_string_length() };
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}
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simdjson_really_inline uint64_t get_str_uint64(const ::sajson::value &obj, std::string_view key) {
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// Since sajson only supports 53-bit numbers, and IDs in twitter.json can be > 53 bits, we read the corresponding id_str and parse that.
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auto val = obj.get_value_of_key({key.data(), key.length()});
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if (val.get_type() != ::sajson::TYPE_STRING) { throw "field not a string"; }
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auto str = val.as_cstring();
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char *endptr;
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uint64_t result = strtoull(str, &endptr, 10);
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if (endptr != &str[val.get_string_length()]) { throw "field is a string, but not an integer string"; }
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return result;
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}
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bool run(simdjson::padded_string &json, uint64_t find_id, std::string_view &result) {
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if (!ast_buffer) {
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ast_buffer_size = json.size();
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ast_buffer = (size_t *)std::malloc(ast_buffer_size * sizeof(size_t));
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}
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auto doc = ::sajson::parse(
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::sajson::bounded_allocation(ast_buffer, ast_buffer_size),
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::sajson::mutable_string_view(json.size(), json.data())
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);
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if (!doc.is_valid()) { return false; }
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auto root = doc.get_root();
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if (root.get_type() != ::sajson::TYPE_OBJECT) { printf("a\n"); return false; }
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auto statuses = root.get_value_of_key({"statuses", strlen("statuses")});
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if (statuses.get_type() != ::sajson::TYPE_ARRAY) { return false; }
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for (size_t i=0; i<statuses.get_length(); i++) {
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auto tweet = statuses.get_array_element(i);
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if (tweet.get_type() != ::sajson::TYPE_OBJECT) { printf("b\n"); return false; }
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// TODO if there is a way to get the raw string, it might be faster to iota find_id and then
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// compare it to each id_str, instead of parsing each int and comparing to find_id.
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if (get_str_uint64(tweet, "id_str") == find_id) {
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result = get_string_view(tweet, "text");
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return true;
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}
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}
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return false;
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}
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};
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BENCHMARK_TEMPLATE(find_tweet, sajson)->UseManualTime();
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} // namespace find_tweet
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#endif // SIMDJSON_COMPETITION_SAJSON
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