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Viewing file:     sort.js (2.14 KB)      -rw-r--r--

module.exports = sortByProcedure;

/*
	sort the parts of the passed selector,
	as there is potential for optimization
	(some types of selectors are faster than others)
*/

var procedure = require("./procedure.json");

var attributes = {
    __proto__: null,
    exists: 10,
    equals: 8,
    not: 7,
    start: 6,
    end: 6,
    any: 5,
    hyphen: 4,
    element: 4
};

function sortByProcedure(arr) {
    var procs = arr.map(getProcedure);
    for (var i = 1; i < arr.length; i++) {
        var procNew = procs[i];

        if (procNew < 0) continue;

        for (var j = i - 1; j >= 0 && procNew < procs[j]; j--) {
            var token = arr[j + 1];
            arr[j + 1] = arr[j];
            arr[j] = token;
            procs[j + 1] = procs[j];
            procs[j] = procNew;
        }
    }
}

function getProcedure(token) {
    var proc = procedure[token.type];

    if (proc === procedure.attribute) {
        proc = attributes[token.action];

        if (proc === attributes.equals && token.name === "id") {
            //prefer ID selectors (eg. #ID)
            proc = 9;
        }

        if (token.ignoreCase) {
            //ignoreCase adds some overhead, prefer "normal" token
            //this is a binary operation, to ensure it's still an int
            proc >>= 1;
        }
    } else if (proc === procedure.pseudo) {
        if (!token.data) {
            proc = 3;
        } else if (token.name === "has" || token.name === "contains") {
            proc = 0; //expensive in any case
        } else if (token.name === "matches" || token.name === "not") {
            proc = 0;
            for (var i = 0; i < token.data.length; i++) {
                //TODO better handling of complex selectors
                if (token.data[i].length !== 1) continue;
                var cur = getProcedure(token.data[i][0]);
                //avoid executing :has or :contains
                if (cur === 0) {
                    proc = 0;
                    break;
                }
                if (cur > proc) proc = cur;
            }
            if (token.data.length > 1 && proc > 0) proc -= 1;
        } else {
            proc = 1;
        }
    }
    return proc;
}