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index.js
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index.js
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'use strict';
var DEFAULT_LACK = 16;
// Get random 1-9
function getRowNumbers() {
var seq = [];
var temp = [1, 2, 3, 4, 5, 6, 7, 8, 9];
while (temp.length > 1) {
var random = Math.ceil(Math.random() * temp.length) - 1;
seq.push(temp[random]);
temp.splice(random, 1);
}
seq.push(temp[0]);
return seq;
}
// Check new line valid
function checkLine(line, matrix, row) {
var tag = true;
return row.every(function(v, i) {
// check column
for (var p = line - 1; p >= 0; p--) {
if (matrix[p][i] === v) {
tag = false;
return false;
}
}
// check block
var xOffset = i % 3;
var yOffset = line % 3;
for (var x = i - xOffset; x < i - xOffset + 3; x++) {
for (var y = line - yOffset; y < line; y++) {
if (matrix[y][x] === v) {
return false;
}
}
}
return true;
});
}
// Get last Row from above lines
function getLastLine(matrix) {
var column = 0;
var row = [];
while (column < 9) {
var temp = [1, 2, 3, 4, 5, 6, 7, 8, 9];
matrix.forEach(function(v, i) {
var index = temp.indexOf(v[column]);
temp.splice(index, 1);
});
column++;
row.push(temp[0]);
}
return row;
}
function getFull() {
var matrix = [];
// line 1 to line 8
for (var i = 0, len = 8; i < len; i++) {
var row = getRowNumbers();
if (i !== 0) {
var randomCount = 1;
while (!checkLine(i, matrix, row)) {
row = getRowNumbers();
randomCount++;
if (randomCount > 70000) {
return getFull();
}
}
matrix.push(row);
} else {
matrix.push(row);
}
}
// fill line 9
var lastRow = getLastLine(matrix);
if (!checkLine(8, matrix, lastRow)) {
return getFull();
} else {
matrix.push(lastRow);
}
return matrix;
}
function blink(lack) {
var matrix = getFull();
lack = lack && /^\d+$/.test(lack) ? (lack > 64 ? DEFAULT_LACK : Math.abs(lack)) : DEFAULT_LACK;
while (lack--) {
var index = Math.ceil(Math.random() * 81) - 1;
var row = Math.floor(index / 9);
var column = index % 9;
while (matrix[row][column] === 0) {
index = Math.ceil(Math.random() * 81) - 1;
row = Math.floor(index / 9);
column = index % 9;
}
matrix[row][column] = 0;
}
return matrix;
}
function isRepeat(arr) {
for (var i = 0, len = arr.length; i < len; i++) {
if (arr.indexOf(arr[i]) !== arr.lastIndexOf(arr[i])) {
return true;
}
}
return false;
}
/**
* Check sudoku result.
* @param {Array[]} matrix
* @returns Boolean | Object
*/
function checkMatrix(matrix) {
var i, j, len;
// Check row
for (i = 0, len = matrix.length; i < len; i++) {
if (matrix[i].indexOf(0) !== -1) {
return false;
} else if (isRepeat(matrix[i])) {
return {
row: i
};
}
}
// Check column
var s;
var count = 9;
while (count--) {
s = [];
for (i = 0; i < 9; i++) {
if (!/^[1-9]$/.test(matrix[i][count])) {
return false;
} else if (s.indexOf(matrix[i][count]) !== -1) {
return {
column: count
};
}
s.push(matrix[i][count]);
}
}
// Check block
for (var x = 0; x < 3; x++) {
for (var y = 0; y < 3; y++) {
var m = x * 3;
var n = y * 3;
var block = [
matrix[m][n], matrix[m][n+1], matrix[m][n+2],
matrix[m+1][n], matrix[m+1][n+1], matrix[m+1][n+2],
matrix[m+2][n], matrix[m+2][n+1], matrix[m+2][n+2]
];
if (block.indexOf(0) !== -1) {
return false;
} else if (isRepeat(block)) {
return {
block: [x, y]
};
}
}
}
return true;
}
module.exports = {
matrix: getFull,
blink: blink,
checkMatrix: checkMatrix
};