From 19fe90bb0fd37457c47f3873392db5cbb9b87d38 Mon Sep 17 00:00:00 2001
From: Zachary Yedidia
Date: Fri, 26 Aug 2022 07:52:04 -0700
Subject: FIRRTL version support (#2543)

* Parse version and hardcode emitted version

* Throw error if version is too high

* Parse version even if rest is invalid

* Change pattern match to if statement

* Improve version grammar

* Update tests

* Remove outdated comment

* Simplify grammar and use version class

* Simplify and add no version test

* Fix for conflicting lexer rule---
 src/main/antlr4/FIRRTL.g4 | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

(limited to 'src/main/antlr4')

diff --git a/src/main/antlr4/FIRRTL.g4 b/src/main/antlr4/FIRRTL.g4
index d40c6560..10a87c9e 100644
--- a/src/main/antlr4/FIRRTL.g4
+++ b/src/main/antlr4/FIRRTL.g4
@@ -29,7 +29,16 @@ import firrtl.LexerHelper;
 
 // Does there have to be at least one module?
 circuit
-  : 'circuit' id ':' info? INDENT module* DEDENT EOF
+  : version? NEWLINE* 'circuit' id ':' info? INDENT module* DEDENT EOF
+  ;
+
+version
+  : 'FIRRTL' 'version' semver NEWLINE
+  ;
+
+// Due to lexer problems, something like 1.1.0 is lexed as DoubleLit '.' UnsignedInt
+semver
+  : DoubleLit '.' UnsignedInt
   ;
 
 module
-- 
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