Add SQL is::url() function for checking if a string is a URL

lib/src/fnc/is.rs

@@ -4,6 +4,7 @@ use once_cell::sync::Lazy;
 use regex::Regex;
 use semver::Version;
 use std::char;
+use url::Url;
 use uuid::Uuid;
 
 #[rustfmt::skip] static LATITUDE_RE: Lazy<Regex> = Lazy::new(|| Regex::new("^[-+]?([1-8]?\\d(\\.\\d+)?|90(\\.0+)?)$").unwrap());
@@ -59,6 +60,11 @@ pub fn semver((arg,): (String,)) -> Result<Value, Error> {
 	Ok(Version::parse(arg.as_str()).is_ok().into())
 }
 
+#[inline]
+pub fn url((arg,): (String,)) -> Result<Value, Error> {
+	Ok(Url::parse(&arg).is_ok().into())
+}
+
 #[inline]
 pub fn uuid((arg,): (Value,)) -> Result<Value, Error> {
 	Ok(match arg {

lib/src/fnc/mod.rs

@@ -101,6 +101,7 @@ pub fn synchronous(ctx: &Context<'_>, name: &str, args: Vec<Value>) -> Result<Va
 		"is::longitude" => is::longitude,
 		"is::numeric" => is::numeric,
 		"is::semver" => is::semver,
+		"is::url" => is::url,
 		"is::uuid" => is::uuid,
 		//
 		"math::abs" => math::abs,

lib/src/sql/function.rs

@@ -309,6 +309,7 @@ fn function_is(i: &str) -> IResult<&str, &str> {
 		tag("is::longitude"),
 		tag("is::numeric"),
 		tag("is::semver"),
+		tag("is::url"),
 		tag("is::uuid"),
 	))(i)
 }