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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/memory/memory.h"
#include "absl/strings/ascii.h"
#include "absl/strings/str_cat.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(std::vector<Ast::Tree>* trees) {
*error_ = "";
while (SkipWhitespace()) {
trees->emplace_back();
if (!ParseTree(&trees->back())) {
return false;
}
}
return done();
}
bool done() const { return contents_.empty(); }
char peek() const { return contents_[0]; }
private:
bool ParseTree(Ast::Tree* tree) {
if (!Read('(')) {
return false;
}
if (!ParseSequence(tree)) {
return false;
}
for (;;) {
if (!SkipWhitespace()) {
return Error("reached EOF when parsing tree");
}
if (peek() == '(') {
tree->children.emplace_back();
if (!ParseTree(&tree->children.back())) {
return false;
}
} else {
return Read(')');
}
}
}
bool ParseSequence(Ast::Tree* tree) {
if (!SkipWhitespace()) {
return Error("reached EOF when parsing sequence");
}
for (;;) {
if (peek() != ';') {
// All valid trees must contain at least one node.
if (tree->nodes.empty()) {
return Error("tree has no nodes");
}
return true;
}
Read(';');
tree->nodes.emplace_back();
if (!ParseNode(&tree->nodes.back())) {
return false;
}
}
}
bool ParseNode(Ast::Node* node) {
for (;;) {
if (!SkipWhitespace()) {
return Error("reached EOF when parsing node");
}
if (!absl::ascii_isupper(peek())) {
return true;
}
node->properties.emplace_back();
if (!ParseProperty(&node->properties.back())) {
return false;
}
}
}
bool ParseProperty(Ast::Property* prop) {
if (!ReadTo('[', &prop->id)) {
return false;
}
if (prop->id.empty()) {
return Error("property has an empty ID");
}
bool read_value = false;
for (;;) {
if (!SkipWhitespace()) {
return Error("reached EOF when parsing property ", prop->id);
}
if (peek() != '[') {
if (!read_value) {
return Error("property ", prop->id, " has no values");
}
return true;
}
Read('[');
read_value = true;
std::string value;
if (!ReadTo(']', &value)) {
return false;
}
prop->values.push_back(std::move(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;
}
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_;
};
void GetTreeImpl(const Ast::Tree& tree,
std::vector<std::unique_ptr<Node>>* dst) {
const auto* src = &tree;
const Ast::Property* prop;
// Extract all the nodes out of this tree.
for (const auto& node : src->nodes) {
// Parse move.
Move move;
if ((prop = node.FindProperty("B")) != nullptr) {
move.color = Color::kBlack;
} else if ((prop = node.FindProperty("W")) != nullptr) {
move.color = Color::kWhite;
} else {
continue;
}
if (prop->values.empty()) {
MG_LOG(WARNING) << "Skipping node " << node.ToString()
<< " because property " << prop->ToString()
<< " has no values";
continue;
}
move.c = Coord::FromSgf(prop->values[0]);
// Parse comment.
std::string comment;
if ((prop = node.FindProperty("C")) != nullptr && !prop->values.empty()) {
comment = prop->values[0];
}
dst->push_back(absl::make_unique<Node>(move, std::move(comment)));
dst = &(dst->back()->children);
}
for (const auto& src_child : src->children) {
GetTreeImpl(src_child, dst);
}
}
} // namespace
std::string Ast::Property::ToString() const {
return absl::StrCat(id, "[", absl::StrJoin(values, "]["), "]");
}
std::string Ast::Node::ToString() const {
std::string str = ";";
for (const auto& property : properties) {
absl::StrAppend(&str, property.ToString());
}
return str;
}
const Ast::Property* Ast::Node::FindProperty(absl::string_view id) const {
for (const auto& property : properties) {
if (property.id == id) {
return &property;
}
}
return nullptr;
}
std::string Ast::Tree::ToString() const {
std::vector<std::string> parts;
for (const auto& node : nodes) {
parts.push_back(node.ToString());
}
for (const auto& child : children) {
parts.push_back(child.ToString());
}
return absl::StrCat("(", absl::StrJoin(parts, "\n"), ")");
}
bool Ast::Parse(std::string contents) {
error_ = "";
trees_.clear();
contents_ = std::move(contents);
return Parser(contents_, &error_).Parse(&trees_);
}
std::string CreateSgfString(absl::Span<const MoveWithComment> moves,
const CreateSgfOptions& options) {
std::string str = "(";
// TODO(tommadams): Clean this up once the Abseil team releases proper
// formatting functions.
absl::StrAppend(
&str, absl::StrCat(";GM[1]FF[4]CA[UTF-8]AP[Minigo_sgfgenerator]RU[",
options.ruleset, "]\n", "SZ[", kN, "]KM[",
options.komi, "]PW[", options.white_name, "]PB[",
options.black_name, "]RE[", options.result, "]\n"));
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);
const char* color = move.color == Color::kBlack ? "B" : "W";
absl::StrAppend(&str, absl::StrCat(";", 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::vector<Move> Node::ExtractMainLine() const {
std::vector<Move> result;
const auto* node = this;
for (;;) {
result.push_back(node->move);
if (node->children.empty()) {
break;
}
node = node->children[0].get();
}
return result;
}
std::vector<std::unique_ptr<Node>> GetTrees(const Ast& ast) {
std::vector<std::unique_ptr<Node>> dst;
for (const auto& tree : ast.trees()) {
GetTreeImpl(tree, &
4334
;dst);
}
return dst;
}
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