From be4e54c5be1344d631f5b8921cbc2392d5e3a757 Mon Sep 17 00:00:00 2001
From: Ryan Chandler <ryangjchandler@gmail.com>
Date: Tue, 13 Sep 2022 20:46:16 +0100
Subject: [PATCH] parser: add associativity mappings

---
 trunk_parser/src/parser/precedence.rs | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/trunk_parser/src/parser/precedence.rs b/trunk_parser/src/parser/precedence.rs
index ed6ed41..4b21d3f 100644
--- a/trunk_parser/src/parser/precedence.rs
+++ b/trunk_parser/src/parser/precedence.rs
@@ -81,10 +81,31 @@ impl Precedence {
             _ => unimplemented!("postfix precedence for op {:?}", kind),
         }
     }
+
+    pub fn associativity(&self) -> Option<Associativity> {
+        Some(match self {
+            Self::Instanceof
+            | Self::MulDivMod
+            | Self::AddSub
+            | Self::BitShift
+            | Self::Concat
+            | Self::BitwiseAnd
+            | Self::BitwiseOr
+            | Self::BitwiseXor
+            | Self::And
+            | Self::Or
+            | Self::KeyAnd
+            | Self::KeyOr
+            | Self::KeyXor => Associativity::Left,
+            Self::Pow | Self::NullCoalesce | Self::Assignment => Associativity::Right,
+            Self::Ternary | Self::Equality | Self::LtGt => Associativity::Non,
+            _ => return None,
+        })
+    }
 }
 
 pub enum Associativity {
-    None,
+    Non,
     Left,
     Right,
 }