parser: statically compile regex w/ lazy_static

As per regex library's documentation

1 files changed, 5 insertions, 4 deletions

diff --git a/modelica-parser-lalrpop/src/lib.rs b/modelica-parser-lalrpop/src/lib.rs
index b515d73..ed07ca2 100644
--- a/modelica-parser-lalrpop/src/lib.rs
+++ b/modelica-parser-lalrpop/src/lib.rs
@@ -2,6 +2,7 @@
 extern crate lalrpop_util;
 extern crate colored;
 extern crate regex;
+#[macro_use] extern crate lazy_static;
 
 mod parser;
 mod ast;
@@ -20,12 +21,12 @@ pub use parser::{
 };
 
 pub fn strip_comments(raw: &str) -> String {
-    // TODO: shouldn't recompile regex on every function call
-
     // Match on comments:
     //      (?m) sets multi-line mode
-    let comment_re = Regex::new(r"(?m)(//.*)$").unwrap();
-    comment_re.replace_all(&raw, "")
+    lazy_static! {
+        static ref RE: Regex = Regex::new(r"(?m)(//.*)$").unwrap();
+    }
+    RE.replace_all(&raw, "")
 }
 
 fn pp_segment(raw: &str, start: usize, end: usize) -> String {