forked from projectmoon/tenebrous-dicebot
81 lines
2.1 KiB
JavaScript
81 lines
2.1 KiB
JavaScript
|
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;
|
||
|
|
}
|