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var _ = require("underscore");

function fragment(children) {
    return {
        type: "fragment",
        children: collapseFragments(children)
    };
}

function element(tagName, attributes, children) {
    return {
        type: "element",
        tagName: tagName,
        attributes: attributes,
        children: collapseFragments(children)
    };
}

function text(value) {
    return {
        type: "text",
        value: value
    };
}

function collapseFragments(elements) {
    return _.flatten((elements || []).map(function(element) {
        return element.type === "fragment" ? element.children : [element];
    }), true)
}

exports.fragment = fragment;
exports.element = element;
exports.text = text;