Does not use internal result of xpath expression

[yshrini]

I am exploring use of this library and found that if there is sub xpath expression, evaluation throws error.

e.g 1:
$(document).xpath("replace(replace('This is the test string','the',''), 'test', 'best')")
throws error
{
Code:"XPTY0004"
message:"Type is not appropriate for the context in which the expression occurs"
}
e.g 2:
$(document).xpath("contcat(concat('a', 'b'),'c')")
throws error
Code:"XPST0017"
message : Expanded QName and number of arguments in a function call do not match the name and arity of a function signature"

[ilinsky]

concerning 1 - there is a bug in the implementation: https://github.com/ilinsky/xpath.js/blob/master/src/functions/string.js#L353 , where replace function returns boolean instead of a string (because of a typo)!, hence passing boolean second time in a replace throws error..
concerning 2 - when you correct spelling error: contcat -> concat, the return will be correct.

So, there is generally no problem with nested xpath expressions.

[ilinsky]

Filled an issue ilinsky/xpath2.js#11