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Copy pathposition.ts
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163 lines (139 loc) · 4.65 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.
import {Color, Move, Nullable, Point, movesEqual, otherColor, stonesEqual, toKgs} from './base'
import {partialUpdate} from './util'
namespace Annotation {
export enum Shape {
Dot,
}
}
interface Annotation {
p: Point;
shape: Annotation.Shape;
colors: string[];
}
class Position {
n = 0;
q: Nullable<number> = null;
moveNum: number;
search: Move[] = [];
// A map of variations.
// The pricinpal variation is keyed by "pv".
// The current tree search is keyed by "search".
// All other variations are keyed by their KGS string.
variations = new Map<string, Move[]>();
annotations: Annotation[] = [];
childN: Nullable<number[]> = null;
childQ: Nullable<number[]> = null;
// children[0] is the main line. Subsequent children are variations.
children: Position[] = [];
// captures[0] is the number of stones that black has captured.
// captures[1] is the number of stones that white has captured.
captures: number[] = [0, 0];
comment = "";
constructor(public id: string,
public parent: Nullable<Position>,
public stones: Color[],
public lastMove: Nullable<Move>,
public toPlay: Color,
public gameOver: boolean,
public isMainLine: boolean) {
this.moveNum = parent != null ? parent.moveNum + 1 : 0;
if (lastMove != null && lastMove != 'pass' && lastMove != 'resign') {
this.annotations.push({
p: lastMove,
shape: Annotation.Shape.Dot,
colors: ['#ef6c02'],
});
}
}
addChild(id: string, move: Move, stones: Color[], gameOver: boolean) {
// If the position already has a child with the given move, verify that the
// stones are equal and return the existing child.
for (let child of this.children) {
if (child.lastMove == null) {
throw new Error('Child node shouldn\'t have a null lastMove');
}
if (movesEqual(child.lastMove, move)) {
if (!stonesEqual(stones, child.stones)) {
throw new Error(`Position has child ${toKgs(move)} with different stones`);
}
return child;
}
}
// Create a new child.
let isMainLine = this.isMainLine && this.children.length == 0;
let child = new Position(id, this, stones, move, otherColor(this.toPlay),
gameOver, isMainLine);
this.children.push(child);
return child;
}
update(update: Position.Update) {
// Update simple properties.
const props = ['n', 'q', 'childN', 'childQ'];
partialUpdate(update, this, props);
// Variations need special handling.
if (update.variations != null) {
for (let key in update.variations) {
this.variations.set(key, update.variations[key]);
}
// If the update has a principal variation also update the variation
// at it's first move.
if ("pv" in update.variations) {
let pv = update.variations["pv"];
if (pv.length > 0) {
this.variations.set(toKgs(pv[0]), pv);
}
}
}
}
// Returns a copy of the complete variation that this position is a part of,
// starting from the root, down to the last move in the line.
// The varation of the root node is its main line.
getFullLine() {
// Get all ancestors.
let result: Position[] = [];
let node: Nullable<Position>
for (node = this.parent; node != null; node = node.parent) {
result.push(node);
}
result.reverse();
// Append descendants.
for (node = this; node != null; node = node.children[0]) {
result.push(node);
}
return result;
}
}
namespace Position {
export interface Update {
// Number of reads under this position.
n?: number;
// This position's Q score.
q?: number;
// A map of variations.
// The pricinpal variation is keyed by "pv".
// The current tree search is keyed by "search".
// All other variations are keyed by their KGS string.
variations?: {[index: string]: Move[]};
// Child visit counts.
childN?: number[];
// Child Q scores.
childQ?: number[];
}
}
export {
Annotation,
Position,
};