80 lines
1.8 KiB
JavaScript
80 lines
1.8 KiB
JavaScript
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import * as CellSet from Geometry.CellSet;
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import * as Decoder from Share.Decoder.Class;
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import {diagonal, plus, zero} from Geometry.Vector;
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import * as Vector from Geometry.Vector;
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import * as Protocol from Share.Protocol;
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return {
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grid: decodeGrid
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};
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function decodeGrid(size, input) {
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if(input != undefined) {
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return decoderLoop(
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Decoder.make(input),
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square(size),
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CellSet.make({type: 'rectangle', origin: zero(), offset: diagonal(size)})
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);
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}
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}
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function decoderLoop(decoder, grid, missing) {
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var queue = [];
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var nextBit = decoder.pop();
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var cell = zero();
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var danglingCells = [];
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while(nextBit != null) {
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if(nextBit == 1) {
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fillBlock(grid, decodeBlock(decoder), missing);
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} else {
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handleCell(grid, cell, decodeDirection(decoder), danglingCells);
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}
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moveToNext(cell, grid, missing);
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nextBit = decoder.pop();
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}
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resolve(grid, danglingCells);
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return grid;
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}
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function moveToNext(cell, grid, missing) {
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cell.column++;
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while(!missing.contains(cell)) {
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if(cell.column >= grid[cell.row].length) {
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cell.row++;
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cell.column = 0;
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} else {
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cell.column++;
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}
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}
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}
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function fillBlock(grid, block, missing, cell) {
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var offset = Vector[block.direction](1);
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var newCell = Vector.make(cell.row, cell.column);
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for(var delta = 0; delta < block.size; delta++) {
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set(grid, newCell, block.color);
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missing.remove(newCell);
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newCell = plus(newCell, offset);
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}
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}
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function decodeBlock(decoder) {
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return {
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direction: decoder.pop() == 1 ? 'vertical' : 'horizontal',
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size: decoder.variableLength6() + Protocol.MIN_BLOCK_SIZE,
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color: decoder.int(3)
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};
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}
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function handleCell(grid, cell, direction, danglingCells) {
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}
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function resolve(grid, danglingCells) {
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}
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function decodeDirection(decoder) {
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return Protocol.directions[decoder.int(2)];
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}
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