From 26698c0cf88015653e2503d0ab5e44f63f77e6fe Mon Sep 17 00:00:00 2001
From: Adrian Thurston <thurston@colm.net>
Date: Fri, 29 Nov 2019 18:21:16 -0800
Subject: rust grammar: partial impl of floats

---
 grammar/rust.lm | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

(limited to 'grammar')

diff --git a/grammar/rust.lm b/grammar/rust.lm
index 45e01d73..ad6d25d8 100644
--- a/grammar/rust.lm
+++ b/grammar/rust.lm
@@ -31,9 +31,17 @@ lex
 		( ( 'u' | 'i' ) [a-z0-9]+ )?
 	/
 
+	rl float_exponent
+		/ ( [eE] [+\-]? [0-9_]* [0-9] [0-9_]* )? /
+
+	rl float_suffix
+		/ ( 'f32' | 'f64' )? /
+
+	# Not implemented: DEC_LITERAL . (not immediately followed by ., _ or an identifier)
 	token float/
-		[0-9]+ '.' [0-9]+
-		( 'f32' | 'f64' )?
+		[0-9]+ float_exponent |
+		[0-9]+ '.' [0-9]+ float_exponent? |
+		[0-9]+ ( '.' [0-9]+ )? float_exponent? float_suffix
 	/
 
 	token raw_string /
-- 
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