Demo for query storing
Change-Id: I947bcac841992c3f6cfd01ab337c265b0d01cb70
diff --git a/node_modules/nth-check/parse.js b/node_modules/nth-check/parse.js
new file mode 100644
index 0000000..5302951
--- /dev/null
+++ b/node_modules/nth-check/parse.js
@@ -0,0 +1,40 @@
+module.exports = parse;
+
+//following http://www.w3.org/TR/css3-selectors/#nth-child-pseudo
+
+//[ ['-'|'+']? INTEGER? {N} [ S* ['-'|'+'] S* INTEGER ]?
+var re_nthElement = /^([+\-]?\d*n)?\s*(?:([+\-]?)\s*(\d+))?$/;
+
+/*
+ parses a nth-check formula, returns an array of two numbers
+*/
+function parse(formula){
+ formula = formula.trim().toLowerCase();
+
+ if(formula === "even"){
+ return [2, 0];
+ } else if(formula === "odd"){
+ return [2, 1];
+ } else {
+ var parsed = formula.match(re_nthElement);
+
+ if(!parsed){
+ throw new SyntaxError("n-th rule couldn't be parsed ('" + formula + "')");
+ }
+
+ var a;
+
+ if(parsed[1]){
+ a = parseInt(parsed[1], 10);
+ if(isNaN(a)){
+ if(parsed[1].charAt(0) === "-") a = -1;
+ else a = 1;
+ }
+ } else a = 0;
+
+ return [
+ a,
+ parsed[3] ? parseInt((parsed[2] || "") + parsed[3], 10) : 0
+ ];
+ }
+}