diffusion/src/node_modules/topics/split-path-selector.js

Diffusion JavaScript client

var inherits = require('inherits');

var regex = require('util/regex');
var utils = require('topics/topic-path-utils');
var TopicSelector = require('../../selectors/topic-selector');

var DQ = utils.DescendantQualifier;

function SplitPathSelector(components) {
    this.qualifier = components.qualifier;
    this.patterns = [];

    var parts = utils.split(components.base);

    parts.forEach(function (p) {
        this.patterns.push(regex(p));
    }.bind(this));

    TopicSelector.call(
        this,
        components.type,
        components.prefix,
        components.expression);
}

inherits(SplitPathSelector, TopicSelector);

SplitPathSelector.prototype.doSelects = function (topicPath) {
    var length = this.patterns.length,
        parts = topicPath.split(utils.PATH_SEPARATOR);

    switch (this.qualifier) {
        case DQ.MATCH :
            if (parts.length !== length) {
                return false;
            }
            break;
        case DQ.DESCENDANTS_OF_MATCH :
            if (parts.length <= length) {
                return false;
            }
            break;
        case DQ.MATCH_AND_DESCENDANTS :
            if (parts.length < length) {
                return false;
            }
            break;
    }

    var i = 0;
    for (; i < length; ++i) {
        if (!this.patterns[i](parts[i])) {
            return false;
        }
    }

    return true;
};

module.exports = SplitPathSelector;