From 3cccac26dc804704446cd88676dc583f997252fd Mon Sep 17 00:00:00 2001
From: Marshall Lochbaum <mwlochbaum@gmail.com>
Date: Wed, 17 Aug 2022 10:20:36 -0400
Subject: Index-based is better than mask-based tracing (e.g. for strings and
 comments)

---
 src/c.bqn | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'src/c.bqn')

diff --git a/src/c.bqn b/src/c.bqn
index eaf221b3..fb4f88b1 100644
--- a/src/c.bqn
+++ b/src/c.bqn
@@ -46,8 +46,8 @@ Tokenize←{System‿vars←𝕨
   c←𝕩='#'⋄s←/0‿0⊸«⊸∧sm←𝕩='''⋄d←/dm←𝕩='"'
   g←⍋q←∾⟨  s⋄¯1↓d⋄/c⟩ ⋄q↩g⊏q                # Open indices
   e← g⊏∾⟨2+s⋄ 1↓d⋄-⟜»∘⊏⟜(0∾+`c)⊸//(𝕩∊lf)∾1⟩ # Matching close indices
-  Se←{(⊏˜𝕨)Se 1¨⌾((𝕩/𝕨)⊸⊏)𝕩}⍟(0=¯1⊑⊢)       # Mark reachable openings
-  St←(≠𝕩)↑·/⁼((≠↑∾⟜≠Se 1∾0¨)q⍋e)⊸/          # All indices → reached mask
+  Se←≠(>/⊢)∾⟜≠{(⊏˜𝕨)𝕊⍟(≠○(¯1⊸⊑))𝕩∾𝕩⊏𝕨}⟨0⟩˙  # Find reachable openings
+  St←(≠𝕩)↑·/⁼(Se q⍋e)⊸⊏                     # All indices → reached mask
   a←St q⋄b←St e⋄f←1≠`ab←a∨b                 # Open/close masks; filter
   {!⟨⊑/𝕩,"Unclosed quote"⟩}⍟(∨´)(sm∨dm)∧b<f
 
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