From 10c08e6a44dc7d12a8f2be8688d19e6060c0024d Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Mon, 24 Aug 2020 00:41:48 +0100
Subject: [PATCH] fix

---
 src/global.rs  |  1 -
 src/imports.rs |  2 ++
 src/pieces.rs  |  1 +
 src/spec.rs    | 13 ++++++++++++-
 4 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/src/global.rs b/src/global.rs
index d4e605e9..5dbe0674 100644
--- a/src/global.rs
+++ b/src/global.rs
@@ -1,7 +1,6 @@
 #![allow(clippy::let_and_return)]
 
 use crate::imports::*;
-use lazy_static::lazy_static;
 
 use std::sync::PoisonError;
 
diff --git a/src/imports.rs b/src/imports.rs
index 83d97b37..04698213 100644
--- a/src/imports.rs
+++ b/src/imports.rs
@@ -62,6 +62,8 @@ pub use index_vec::{define_index_type,index_vec,IndexVec,IndexSlice};
 pub use vecdeque_stableix::StableIndexVecDeque;
 
 pub use fs2::FileExt;
+pub use lazy_static::lazy_static;
+pub use regex::Regex;
 
 pub use crate::global::*;
 pub use crate::gamestate::*;
diff --git a/src/pieces.rs b/src/pieces.rs
index 454c96b9..e0a41ecd 100644
--- a/src/pieces.rs
+++ b/src/pieces.rs
@@ -23,6 +23,7 @@ pub enum SVGProcessingError {
   WriteFail,
   NegativeDragraise,
   ImproperSizeSpec,
+  UnsupportedColourSpec,
 }
 
 display_as_debug!{SVGProcessingError}
diff --git a/src/spec.rs b/src/spec.rs
index cbbe7ca0..178682ce 100644
--- a/src/spec.rs
+++ b/src/spec.rs
@@ -128,7 +128,18 @@ mod implementation {
     type Error = SE;
     #[throws(SE)]
     fn try_from(spec: &ColourSpec) -> Colour {
-      // xxx check syntax
+      lazy_static! {
+        static ref RE: Regex = Regex::new(concat!(
+          r"^(?:", r"[[:alpha:]]{1,50}",
+             r"|", r"#[[:xdigit:]]{3}{1,2}",
+             r"|", r"(?:rgba?|hsla?)\([-.%\t 0-9]{1,50}\)",
+            r")$"
+        )).unwrap();
+      }
+      let s = &spec.0;
+      if !RE.is_match(s) {
+        throw!(SVGProcessingError::UnsupportedColourSpec);
+      }
       spec.0.clone()
     }
   }
-- 
2.30.2