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Copy pathcoord.cc
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113 lines (94 loc) · 2.7 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/numbers.h"
#include "absl/strings/str_cat.h"
namespace minigo {
constexpr uint16_t Coord::kPass;
constexpr char Coord::kKgsColumns[];
namespace {
std::pair<bool, Coord> TryParseKgs(absl::string_view str) {
if (str == "pass") {
return {true, Coord::kPass};
}
auto col_char = str[0];
if (col_char < 'A' || col_char > 'T' || col_char == 'I') {
return {false, Coord::kPass};
}
int col = col_char < 'I' ? col_char - 'A' : 8 + col_char - 'J';
auto row_str = str.substr(1);
int row;
if (!absl::SimpleAtoi(row_str, &row) || row <= 0 || row > kN) {
return {false, Coord::kPass};
}
return {true, {kN - row, col}};
}
std::pair<bool, Coord> TryParseSgf(absl::string_view str) {
if (str.empty()) {
return {true, Coord::kPass};
}
if (str.size() != 2) {
return {false, Coord::kPass};
}
int col = str[0] - 'a';
int row = str[1] - 'a';
if (row < 0 || row >= kN || col < 0 || col >= kN) {
return {false, Coord::kPass};
}
return {true, {row, col}};
}
std::pair<bool, Coord> TryParseString(absl::string_view str) {
auto result = TryParseKgs(str);
if (result.first) {
return result;
}
return TryParseSgf(str);
}
} // namespace
Coord Coord::FromKgs(absl::string_view str) {
auto result = TryParseKgs(str);
assert(result.first);
return result.second;
}
Coord Coord::FromSgf(absl::string_view str) {
auto result = TryParseSgf(str);
assert(result.first);
return result.second;
}
Coord Coord::FromString(absl::string_view str) {
auto result = TryParseString(str);
assert(result.first);
return result.second;
}
std::string Coord::ToKgs() const {
if (*this == kPass) {
return "pass";
}
int row = value_ / kN;
int col = value_ % kN;
absl::string_view col_str = kKgsColumns;
return absl::StrCat(col_str.substr(col, 1), kN - row);
}
std::ostream& operator<<(std::ostream& os, Coord c) {
if (c == Coord::kPass) {
return os << "pass";
} else {
uint16_t value = c;
int row = value / kN;
int col = value % kN;
return os << Coord::kKgsColumns[col] << (kN - row);
}
}
} // namespace minigo