From 4844eb55a7c1dca03f15d07ff22a34e3ab3d134c Mon Sep 17 00:00:00 2001
From: Weiqun Zhang <weiqunzhang@lbl.gov>
Date: Sat, 16 Mar 2019 11:22:19 -0700
Subject: add unary plus sign and fix a bug

---
 Source/Parser/wp_parser.y | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'Source/Parser/wp_parser.y')

diff --git a/Source/Parser/wp_parser.y b/Source/Parser/wp_parser.y
index e3a007949..3081125cc 100644
--- a/Source/Parser/wp_parser.y
+++ b/Source/Parser/wp_parser.y
@@ -38,7 +38,7 @@
 %left '+' '-'
 %left '*' '/'
 %left '<' '>'
-%nonassoc NEG
+%nonassoc NEG UPLUS
 %right POW
 
 /* This specifies the type of `exp` (i.e., struct wp_node*).  Rules
@@ -75,6 +75,7 @@ exp:
 | exp '<' exp                { $$ = wp_newf2(WP_LT, $1, $3); }
 | exp '>' exp                { $$ = wp_newf2(WP_GT, $1, $3); }
 | '-'exp %prec NEG           { $$ = wp_newnode(WP_NEG, $2, NULL); }
+| '+'exp %prec UPLUS         { $$ = $2; }
 | exp POW exp                { $$ = wp_newf2(WP_POW, $1, $3); }
 | F1 '(' exp ')'             { $$ = wp_newf1($1, $3); }
 | F2 '(' exp ',' exp ')'     { $$ = wp_newf2($1, $3, $5); }
-- 
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