From 9d60333af95adf64f2489e1e51563f0694abdd2a Mon Sep 17 00:00:00 2001
From: Keith Yeung <kungfukeith11@gmail.com>
Date: Sat, 21 Oct 2017 05:12:04 -0700
Subject: [PATCH] Implement string stripping utilities from the Infra spec

---
 components/script/dom/bindings/str.rs | 23 +++++++++++++++++++++++
 components/script/lib.rs              |  3 +++
 2 files changed, 26 insertions(+)

diff --git a/components/script/dom/bindings/str.rs b/components/script/dom/bindings/str.rs
index af33f662ff7..929ff6e20d4 100644
--- a/components/script/dom/bindings/str.rs
+++ b/components/script/dom/bindings/str.rs
@@ -186,6 +186,29 @@ impl DOMString {
     pub fn bytes(&self) -> Bytes {
         self.0.bytes()
     }
+
+    /// Removes newline characters according to <https://infra.spec.whatwg.org/#strip-newlines>.
+    pub fn strip_newlines(&mut self) {
+        self.0.retain(|c| c != '\r' && c != '\n');
+    }
+
+    /// Removes leading and trailing ASCII whitespaces according to
+    /// <https://infra.spec.whatwg.org/#strip-leading-and-trailing-ascii-whitespace>.
+    pub fn strip_leading_and_trailing_ascii_whitespace(&mut self) {
+        if self.0.len() == 0 { return; }
+
+        let last_non_whitespace = match self.0.rfind(|ref c| !char::is_ascii_whitespace(c)) {
+            Some(idx) => idx + 1,
+            None => {
+                self.0.clear();
+                return;
+            }
+        };
+        let first_non_whitespace = self.0.find(|ref c| !char::is_ascii_whitespace(c)).unwrap();
+
+        self.0.truncate(last_non_whitespace);
+        let _ = self.0.splice(0..first_non_whitespace, "");
+    }
 }
 
 impl Borrow<str> for DOMString {
diff --git a/components/script/lib.rs b/components/script/lib.rs
index 719275dc3ec..e4b588f1acd 100644
--- a/components/script/lib.rs
+++ b/components/script/lib.rs
@@ -4,11 +4,14 @@
 
 #![cfg_attr(feature = "unstable", feature(core_intrinsics))]
 #![cfg_attr(feature = "unstable", feature(on_unimplemented))]
+#![feature(ascii_ctype)]
 #![feature(conservative_impl_trait)]
 #![feature(const_fn)]
 #![feature(mpsc_select)]
 #![feature(plugin)]
 #![feature(proc_macro)]
+#![feature(splice)]
+#![feature(string_retain)]
 
 #![deny(unsafe_code)]
 #![allow(non_snake_case)]