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

(limited to 'src/pp.bqn')

diff --git a/src/pp.bqn b/src/pp.bqn
index 6ce99f12..255d214a 100644
--- a/src/pp.bqn
+++ b/src/pp.bqn
@@ -26,8 +26,8 @@ Tokenize←{
   s‿d←/¨2↑sm‿dm‿c‿n←𝕩⊸=¨"'""#"∾lf
   g←⍋q←∾⟨  s⋄¯1↓d⋄/c⟩ ⋄q↩g⊏q                # Open indices
   e← g⊏∾⟨2+s⋄ 1↓d⋄-⟜»∘⊏⟜(0∾+`c)⊸//n∾1⟩      # Matching close indices
-  Se←{(⊏˜𝕨)Se 1¨⌾((𝕩/𝕨)⊸⊏)𝕩}⍟(0=¯1⊑⊢)       # Mark reachable openings
-  ab←(≠𝕩)↑/⁼⥊((≠↑∾⟜≠Se 1∾0¨)q⍋e)/⍉q≍e       # Open/close masks
+  Se←≠(>/⊢)∾⟜≠{(⊏˜𝕨)𝕊⍟(≠○(¯1⊸⊑))𝕩∾𝕩⊏𝕨}⟨0⟩˙  # Find reachable openings
+  ab←(≠𝕩)↑/⁼⥊(Se q⍋e)⊏⍉q≍e                  # Open/close masks
 
   k←(n∧ab)<»(𝕩='•')∨(∧⟜«𝕩∊wc)∨≠`ab          # Token continuation mask
   (¯1+`¬k)⊔𝕩
-- 
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