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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/sgf.h"
#include <cctype>
#include <utility>
#include "absl/container/flat_hash_set.h"
#include "absl/strings/ascii.h"
#include "absl/strings/str_cat.h"
#include "absl/strings/str_format.h"
#include "absl/strings/str_join.h"
#include "cc/constants.h"
#include "cc/logging.h"
namespace minigo {
namespace sgf {
namespace {
class Parser {
public:
Parser(absl::string_view contents, std::string* error)
: original_contents_(contents), contents_(contents), error_(error) {}
bool Parse(Collection* collection) {
*error_ = "";
while (SkipWhitespace()) {
collection->trees.push_back(absl::make_unique<Tree>());
if (!ParseTree(collection->trees.back().get())) {
return false;
}
}
return done();
}
bool done() const { return contents_.empty(); }
char peek() const { return contents_[0]; }
private:
bool ParseTree(Tree* tree) {
if (!Read('(')) {
return false;
}
if (!ParseSequence(tree)) {
return false;
}
for (;;) {
if (!SkipWhitespace()) {
return Error("reached EOF when parsing tree");
}
if (peek() == '(') {
tree->sub_trees.push_back(absl::make_unique<Tree>());
if (!ParseTree(tree->sub_trees.back().get())) {
return false;
}
} else {
return Read(')');
}
}
}
bool ParseSequence(Tree* tree) {
for (;;) {
if (!SkipWhitespace()) {
return Error("reached EOF when parsing sequence");
}
if (peek() != ';') {
break;
}
tree->nodes.push_back(absl::make_unique<Node>());
if (!ParseNode(tree->nodes.back().get())) {
return false;
}
}
if (tree->nodes.empty()) {
return Error("tree has no nodes");
}
return true;
}
bool ParseNode(Node* node) {
MG_CHECK(Read(';'));
for (;;) {
if (!SkipWhitespace()) {
return Error("reached EOF when parsing node");
}
if (!absl::ascii_isupper(peek())) {
return true;
}
Property prop;
if (!ParseProperty(&prop)) {
return false;
}
if (prop.id == "B" || prop.id == "W") {
if (node->move.color != Color::kEmpty) {
return Error("node already has a move");
}
node->move.color = prop.id == "B" ? Color::kBlack : Color::kWhite;
if (prop.values.size() != 1) {
return Error("expected exactly one property value, got \"",
prop.ToString(), "\"");
}
node->move.c = Coord::FromSgf(prop.values[0], true);
if (node->move.c == Coord::kInvalid) {
return Error(prop.values[0], " is not a valid SGF coordinate");
}
} else {
node->properties.push_back(std::move(prop));
}
}
}
bool ParseProperty(Property* prop) {
if (!ReadTo('[', &prop->id)) {
return false;
}
if (prop->id.empty()) {
return Error("property has an empty ID");
}
if (!SkipWhitespace()) {
return Error("reached EOF when parsing property ", prop->id);
}
for (;;) {
prop->values.emplace_back();
if (!ParseValue(&prop->values.back())) {
return false;
}
SkipWhitespace();
if (peek() != '[') {
break;
}
}
return true;
}
bool ParseValue(std::string* value) {
return Read('[') && ReadTo(']', value) && Read(']');
}
bool Read(char c) {
if (done()) {
return Error("expected '", absl::string_view(&c, 1), "', got EOF");
}
if (contents_[0] != c) {
return Error("expected '", absl::string_view(&c, 1), "', got '",
contents_.substr(0, 1), "'");
}
contents_ = contents_.substr(1);
return true;
}
bool ReadTo(char c, std::string* result) {
result->clear();
bool read_escape = false;
for (size_t i = 0; i < contents_.size(); ++i) {
char x = contents_[i];
if (!read_escape) {
read_escape = x == '\\';
if (read_escape) {
continue;
}
}
// Don't check the we're done reading if the current character is an
// escaped \].
if ((!read_escape || x != ']') && x == c) {
contents_ = contents_.substr(i);
return true;
}
DFE4
absl::StrAppend(result, absl::string_view(&x, 1));
read_escape = false;
}
return Error("reached EOF before finding '", absl::string_view(&c, 1), "'");
}
// Skip over whitespace.
// Updates contents_ and returns true if there are non-whitespace characters
// remaining. Leaves contents_ alone and returns false if only whitespace
// characters remain.
bool SkipWhitespace() {
contents_ = absl::StripLeadingAsciiWhitespace(contents_);
return !contents_.empty();
}
template <typename... Args>
bool Error(Args&&... args) {
// Find the line & column number the error occured at.
int line = 1;
int col = 1;
for (auto* c = original_contents_.data(); c != contents_.data(); ++c) {
if (*c == '\n') {
++line;
col = 1;
} else {
++col;
}
}
*error_ = absl::StrCat("ERROR at line:", line, " col:", col, ": ", args...);
return false;
}
absl::string_view original_contents_;
absl::string_view contents_;
std::string* error_;
};
} // namespace
std::string Property::ToString() const {
return absl::StrCat(id, "[", absl::StrJoin(values, "]["), "]");
}
std::string Node::ToString() const {
std::string str = ";";
if (move.color != Color::kEmpty) {
absl::StrAppend(&str, ColorToCode(move.color), "[", move.c.ToSgf(), "]");
}
for (const auto& prop : properties) {
absl::StrAppend(&str, prop.ToString());
}
return str;
}
const Property* Node::FindProperty(absl::string_view id) const {
for (const auto& prop : properties) {
if (prop.id == id) {
return ∝
}
}
return nullptr;
}
const std::string& Node::GetComment() const {
static const std::string empty;
const auto* prop = FindProperty("C");
return prop != nullptr ? prop->values[0] : empty;
}
std::string Node::GetCommentAndProperties() const {
std::vector<std::string> comments;
std::vector<std::string> prop_strs;
for (const auto& prop : properties) {
if (prop.id == "GC") {
// The game comment goes first.
comments.insert(comments.begin(), prop.values[0]);
} else if (prop.id == "C") {
// The node comment goes after the game comment.
comments.push_back(prop.values[0]);
} else {
prop_strs.push_back(prop.ToString());
}
}
// If we have both comments and properties, insert a blank line to separate
// them.
if (!comments.empty() && !prop_strs.empty()) {
comments.push_back("");
}
comments.insert(comments.end(), prop_strs.begin(), prop_strs.end());
return absl::StrJoin(comments, "\n");
}
std::string Tree::ToString() const {
std::vector<std::string> lines;
for (const auto& node : nodes) {
lines.push_back(node->ToString());
}
for (const auto& sub_tree : sub_trees) {
lines.push_back(sub_tree->ToString());
}
return absl::StrCat("(", absl::StrJoin(lines, "\n"), ")");
}
std::vector<Move> Tree::ExtractMainLine() const {
std::vector<Move> result;
const auto* tree = this;
for (;;) {
for (const auto& node : tree->nodes) {
if (node->move.c != Coord::kInvalid) {
result.push_back(node->move);
}
}
if (tree->sub_trees.empty()) {
break;
}
tree = tree->sub_trees[0].get();
}
return result;
}
std::string Collection::ToString() const {
std::vector<std::string> parts;
for (const auto& tree : trees) {
parts.push_back(tree->ToString());
}
return absl::StrJoin(parts, "\n");
}
bool Parse(absl::string_view contents, Collection* collection,
std::string* error) {
*collection = {};
*error = "";
return Parser(contents, error).Parse(collection);
}
std::string CreateSgfString(absl::Span<const MoveWithComment> moves,
const CreateSgfOptions& options) {
auto str = absl::StrFormat(
"(;GM[1]FF[4]CA[UTF-8]AP[Minigo_sgfgenerator]RU[%s]\n"
"SZ[%d]KM[%g]PW[%s]PB[%s]RE[%s]\n",
options.ruleset, kN, options.komi, options.white_name, options.black_name,
options.result);
if (!options.game_comment.empty()) {
absl::StrAppend(&str, "C[", options.game_comment, "]\n");
}
for (const auto& move_with_comment : moves) {
Move move = move_with_comment.move;
MG_CHECK(move.color == Color::kBlack || move.color == Color::kWhite);
absl::StrAppendFormat(&str, ";%s[%s]", ColorToCode(move.color),
move.c.ToSgf());
if (!move_with_comment.comment.empty()) {
absl::StrAppend(&str, "C[", move_with_comment.comment, "]");
}
}
absl::StrAppend(&str, ")\n");
return str;
}
std::ostream& operator<<(std::ostream& os, const MoveWithComment& move) {
MG_CHECK(move.move.color == Color::kBlack ||
move.move.color == Color::kWhite);
if (move.move.color == Color::kBlack) {
os << "B";
} else {
os << "W";
}
os << "[" << move.move.c.ToSgf() << "]";
if (!move.comment.empty()) {
os << "C[" << move.comment << "]";
}
return os;
}
} // namespace sgf
} // namespace minigo