| 410 | }; |
| 411 | |
| 412 | bool TryFloatFromStringFast(TStringBuf token, float& value) { |
| 413 | if (token.empty()) { |
| 414 | return false; |
| 415 | } |
| 416 | static const NFH::TFlatHashMap<TStringBuf, float, TStupidStringHash> wellKnown = { |
| 417 | { TStringBuf("0.0"), 0.0f}, |
| 418 | { TStringBuf("1.0"), 1.0f}, |
| 419 | { TStringBuf("2.0"), 2.0f}, |
| 420 | { TStringBuf("3.0"), 3.0f}, |
| 421 | { TStringBuf("4.0"), 4.0f}, |
| 422 | { TStringBuf("5.0"), 5.0f}, |
| 423 | { TStringBuf("6.0"), 6.0f}, |
| 424 | { TStringBuf("7.0"), 7.0f}, |
| 425 | { TStringBuf("8.0"), 8.0f}, |
| 426 | { TStringBuf("9.0"), 9.0f} |
| 427 | }; |
| 428 | if (token.size() == 1 && token[0] >= '0' && token[0] <= '9') { |
| 429 | value = float(token[0] - '0'); |
| 430 | return true; |
| 431 | } else if (token.size() == 3) { |
| 432 | if ( auto i = wellKnown.find(token); i != wellKnown.end()) { |
| 433 | value = i->second; |
| 434 | return true; |
| 435 | } |
| 436 | } else if (token[0] == '-' && token.size() == 4) { |
| 437 | if ( auto i = wellKnown.find(token.substr(1)); i != wellKnown.end()) { |
| 438 | value = -i->second; |
| 439 | return true; |
| 440 | } |
| 441 | } |
| 442 | return TryFromString<float>(token, value); |
| 443 | } |
| 444 | } |
| 445 | |
| 446 | bool TryFloatFromString(TStringBuf token, bool parseNonFinite, float* value) { |