89 lines
2.5 KiB
JavaScript
89 lines
2.5 KiB
JavaScript
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(function () {
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"use strict";
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// "FIFO" isn't easy to convert to camelCase and back reliably
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var isFnodeTypes = [
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"isFile", "isDirectory", "isSymbolicLink", "isBlockDevice", "isCharacterDevice", "isFIFO", "isSocket"
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],
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fnodeTypes = [
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"file", "directory", "symbolicLink", "blockDevice", "characterDevice", "FIFO", "socket"
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],
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fnodeTypesPlural = [
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"files", "directories", "symbolicLinks", "blockDevices", "characterDevices", "FIFOs", "sockets"
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];
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//
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function createNodeGroups() {
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var nodeGroups = {};
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fnodeTypesPlural.concat("nodes", "errors").forEach(function (fnodeTypePlural) {
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nodeGroups[fnodeTypePlural] = [];
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});
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return nodeGroups;
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}
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// Determine each file node's type
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//
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function sortFnodesByType(stat, fnodes) {
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var i, isType;
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for (i = 0; i < isFnodeTypes.length; i += 1) {
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isType = isFnodeTypes[i];
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if (stat[isType]()) {
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stat.type = fnodeTypes[i];
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fnodes[fnodeTypesPlural[i]].push(stat);
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return;
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}
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}
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}
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// Get the current number of listeners (which may change)
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// Emit events to each listener
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// Wait for all listeners to `next()` before continueing
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// (in theory this may avoid disk thrashing)
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function emitSingleEvents(emitter, path, stats, next) {
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var num = 1 + emitter.listeners(stats.type).length + emitter.listeners("node").length;
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function nextWhenReady() {
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num -= 1;
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if (0 === num) { next(); }
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}
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emitter.emit(stats.type, path, stats, nextWhenReady);
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emitter.emit("node", path, stats, nextWhenReady);
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nextWhenReady();
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}
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// Since the risk for disk thrashing among anything
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// other than files is relatively low, all types are
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// emitted at once, but all must complete before advancing
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function emitPluralEvents(emitter, path, nodes, next) {
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var num = 1;
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function nextWhenReady() {
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num -= 1;
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if (0 === num) { next(); }
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}
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fnodeTypesPlural.concat(["nodes", "errors"]).forEach(function (fnodeType) {
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if (0 === nodes[fnodeType].length) { return; }
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num += emitter.listeners(fnodeType).length;
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emitter.emit(fnodeType, path, nodes[fnodeType], nextWhenReady);
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});
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nextWhenReady();
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}
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module.exports = {
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emitNodeType: emitSingleEvents,
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emitNodeTypeGroups: emitPluralEvents,
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isFnodeTypes: isFnodeTypes,
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fnodeTypes: fnodeTypes,
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fnodeTypesPlural: fnodeTypesPlural,
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sortFnodesByType: sortFnodesByType,
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createNodeGroups: createNodeGroups
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};
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}());
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