+ /* 1st criterion: 6 space-seperated fields? */
+ var tokens = fen.split(/\s+/);
+ if (tokens.length !== 6) {
+ return {valid: false, error_number: 1, error: errors[1]};
+ }
+
+ /* 2nd criterion: move number field is a integer value > 0? */
+ if (isNaN(tokens[5]) || (parseInt(tokens[5], 10) <= 0)) {
+ return {valid: false, error_number: 2, error: errors[2]};
+ }
+
+ /* 3rd criterion: half move counter is an integer >= 0? */
+ if (isNaN(tokens[4]) || (parseInt(tokens[4], 10) < 0)) {
+ return {valid: false, error_number: 3, error: errors[3]};
+ }
+
+ /* 4th criterion: 4th field is a valid e.p.-string? */
+ if (!/^(-|[abcdefgh][36])$/.test(tokens[3])) {
+ return {valid: false, error_number: 4, error: errors[4]};
+ }
+
+ /* 5th criterion: 3th field is a valid castle-string? */
+ if( !/^[C-HK]?[A-FQ]?[c-hk]?[a-fq]?$/.test(tokens[2]) &&
+ tokens[2] !== '-') {
+ return {valid: false, error_number: 5, error: errors[5]};
+ }
+
+ /* 6th criterion: 2nd field is "w" (white) or "b" (black)? */
+ if (!/^(w|b)$/.test(tokens[1])) {
+ return {valid: false, error_number: 6, error: errors[6]};
+ }
+
+ /* 7th criterion: 1st field contains 8 rows? */
+ var rows = tokens[0].split('/');
+ if (rows.length !== 8) {
+ return {valid: false, error_number: 7, error: errors[7]};
+ }
+
+ /* 8th criterion: every row is valid? */
+ for (var i = 0; i < rows.length; i++) {
+ /* check for right sum of fields AND not two numbers in succession */
+ var sum_fields = 0;
+ var previous_was_number = false;
+
+ for (var k = 0; k < rows[i].length; k++) {
+ if (!isNaN(rows[i][k])) {
+ if (previous_was_number) {
+ return {valid: false, error_number: 8, error: errors[8]};
+ }
+ sum_fields += parseInt(rows[i][k], 10);
+ previous_was_number = true;
+ } else {
+ if (!/^[prnbqkPRNBQK]$/.test(rows[i][k])) {
+ return {valid: false, error_number: 9, error: errors[9]};
+ }
+ sum_fields += 1;
+ previous_was_number = false;
+ }
+ }
+ if (sum_fields !== 8) {
+ return {valid: false, error_number: 10, error: errors[10]};
+ }
+ }
+
+ if ((tokens[3][1] == '3' && tokens[1] == 'w') ||
+ (tokens[3][1] == '6' && tokens[1] == 'b')) {
+ return {valid: false, error_number: 11, error: errors[11]};
+ }
+
+ /* everything's okay! */
+ return {valid: true, error_number: 0, error: errors[0]};
+}
+
+var clients = [];
+var current_servers = [];
+
+var need_reinit = function(servers) {
+ if (servers.length != current_servers.length) {
+ return true;
+ }
+ for (var i = 0; i < servers.length; ++i) {
+ if (servers[i] != current_servers[i]) {
+ return true;
+ }
+ }
+ return false;
+}
+exports.need_reinit = need_reinit;
+
+var init = function(servers) {
+ clients = [];
+ for (var i = 0; i < servers.length; ++i) {
+ clients.push(new hashprobe_proto.HashProbe(servers[i], grpc.credentials.createInsecure()));
+ }
+ current_servers = servers;
+}
+exports.init = init;