Auto merge of #24626 - glowe:issue-21810/improve-validation-methods, r=jdm

Issue 21810/improve validation methods

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This is a start at addressing #21810. I'm putting these changes out early to get some feedback on the following items:

1. I added unit tests for the validation methods mentioned in #21810, because I couldn't tell whether any of the existing WPT tests covered them. Are these tests worthwhile? Are any of them unnecessary?
2. I changed the implementation for `is_valid_floating_point_number_string` so that it passed the tests. The previous version of the function wasn't restrictive enough (it allowed certain whitespace characters before the number string).
3. I changed the catch-all condition in `htmlinputelement.rs` to account for the remaining input types that don't have a value sanitization algorithm. This last change seems good to me since we won't be able to add a new input type without adding it to the case and checking the spec for an algorithm.
---
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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #21810

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- [x] There are tests for these changes

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components/script/dom/bindings/str.rs

@@ -3,11 +3,11 @@
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
 //! The `ByteString` struct.
-
 use chrono::prelude::{Utc, Weekday};
 use chrono::{Datelike, TimeZone};
 use cssparser::CowRcStr;
 use html5ever::{LocalName, Namespace};
+use regex::Regex;
 use servo_atoms::Atom;
 use std::borrow::{Borrow, Cow, ToOwned};
 use std::default::Default;
@@ -337,11 +337,11 @@ impl DOMString {
 
     /// https://html.spec.whatwg.org/multipage/#valid-floating-point-number
     pub fn is_valid_floating_point_number_string(&self) -> bool {
-        // for the case that `parse_floating_point_number` cannot handle
-        if self.0.contains(" ") {
-            return false;
+        lazy_static! {
+            static ref RE: Regex =
+                Regex::new(r"^-?(?:\d+\.\d+|\d+|\.\d+)(?:(e|E)(\+|\-)?\d+)?$").unwrap();
         }
-        parse_floating_point_number(&self.0).is_ok()
+        RE.is_match(&self.0) && parse_floating_point_number(&self.0).is_ok()
     }
 
     /// https://html.spec.whatwg.org/multipage/#best-representation-of-the-number-as-a-floating-point-number

components/script/dom/htmlinputelement.rs

@@ -1213,7 +1213,16 @@ impl HTMLInputElement {
                     value.push_str(sanitized.as_str());
                 }
             },
-            _ => (),
+            // The following inputs don't have a value sanitization algorithm.
+            // See https://html.spec.whatwg.org/multipage/#value-sanitization-algorithm
+            InputType::Button |
+            InputType::Checkbox |
+            InputType::File |
+            InputType::Hidden |
+            InputType::Image |
+            InputType::Radio |
+            InputType::Reset |
+            InputType::Submit => (),
         }
     }