From f2c1f1c13772145acaecb1ebf9b4cafcacb98131 Mon Sep 17 00:00:00 2001
From: bnewbold <bnewbold@robocracy.org>
Date: Sat, 7 Jan 2017 21:46:22 -0800
Subject: parser: statically compile regex w/ lazy_static

As per regex library's documentation
---
 modelica-parser-lalrpop/Cargo.toml | 1 +
 modelica-parser-lalrpop/src/lib.rs | 9 +++++----
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/modelica-parser-lalrpop/Cargo.toml b/modelica-parser-lalrpop/Cargo.toml
index 42c6357..6e4b196 100644
--- a/modelica-parser-lalrpop/Cargo.toml
+++ b/modelica-parser-lalrpop/Cargo.toml
@@ -18,6 +18,7 @@ name = "modelica_parser"
 lalrpop-util = "^0.12.4"
 colored = "1.3"
 regex = "^0.1"
+lazy_static = "^0.2"
 
 [build-dependencies]
 lalrpop = "0.12"
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 {
-- 
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