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Copy pathcoord.cc
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146 lines (124 loc) · 3.54 KB
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// Copyright 2018 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "cc/coord.h"
#include <utility>
#include "absl/strings/ascii.h"
#include "absl/strings/numbers.h"
#include "absl/strings/str_cat.h"
namespace minigo {
constexpr uint16_t Coord::kPass;
constexpr uint16_t Coord::kResign;
constexpr uint16_t Coord::kInvalid;
const char Coord::kGtpColumns[20] = "ABCDEFGHJKLMNOPQRST";
namespace {
Coord TryParseGtp(absl::string_view str) {
auto upper = absl::AsciiStrToUpper(str);
if (upper == "PASS") {
return Coord::kPass;
}
if (upper == "RESIGN") {
return Coord::kResign;
}
auto col_char = upper[0];
if (col_char < 'A' || col_char > 'T' || col_char == 'I') {
return Coord::kInvalid;
}
int col = col_char < 'I' ? col_char - 'A' : 8 + col_char - 'J';
auto row_str = upper.substr(1);
int row;
if (!absl::SimpleAtoi(row_str, &row) || row <= 0 || row > kN) {
return Coord::kInvalid;
}
return {kN - row, col};
}
Coord TryParseSgf(absl::string_view str) {
if (str.empty() || (kN <= 19 && str == "tt")) {
return Coord::kPass;
}
if (str.size() != 2) {
return Coord::kInvalid;
}
int col = str[0] - 'a';
int row = str[1] - 'a';
if (row < 0 || row >= kN || col < 0 || col >= kN) {
return Coord::kInvalid;
}
return {row, col};
}
Coord TryParseString(absl::string_view str) {
auto result = TryParseGtp(str);
if (result != Coord::kInvalid) {
return result;
}
return TryParseSgf(str);
}
} // namespace
Coord Coord::FromGtp(absl::string_view str, bool allow_invalid) {
auto c = TryParseGtp(str);
MG_CHECK(allow_invalid || c != Coord::kInvalid);
return c;
}
Coord Coord::FromSgf(absl::string_view str, bool allow_invalid) {
auto c = TryParseSgf(str);
MG_CHECK(allow_invalid || c != Coord::kInvalid);
return c;
}
Coord Coord::FromString(absl::string_view str, bool allow_invalid) {
auto c = TryParseString(str);
MG_CHECK(allow_invalid || c != Coord::kInvalid);
return c;
}
std::string Coord::ToGtp() const {
if (*this == kPass) {
return "pass";
} else if (*this == kResign) {
return "resign";
} else if (*this == kInvalid) {
return "invalid";
}
int row = value_ / kN;
int col = value_ % kN;
absl::string_view col_str = kGtpColumns;
return absl::StrCat(col_str.substr(col, 1), kN - row);
}
std::string Coord::ToSgf() const {
if (*this == kPass) {
return "";
} else if (*this == kInvalid) {
return "invalid";
}
// We should not be writing resign moves to SGF files.
MG_CHECK(*this != kResign);
int row = value_ / kN;
int col = value_ % kN;
char buffer[2];
buffer[0] = 'a' + col;
buffer[1] = 'a' + row;
return {buffer, 2};
}
std::ostream& operator<<(std::ostream& os, Coord c) {
if (c == Coord::kPass) {
return os << "pass";
} else if (c == Coord::kResign) {
return os << "resign";
} else if (c == Coord::kInvalid) {
return os << "invalid";
} else {
uint16_t value = c;
int row = value / kN;
int col = value % kN;
return os << Coord::kGtpColumns[col] << (kN - row);
}
}
} // namespace minigo