From ab5ef5a77af9f2fc7c3353f05bf716b1a6b93f73 Mon Sep 17 00:00:00 2001
From: Bruce Hill <bruce@bruce-hill.com>
Date: Sun, 13 Sep 2020 16:19:37 -0700
Subject: Added captures in lookaheads/behinds.

---
 vm.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/vm.c b/vm.c
index 2182d8d..c1427a5 100644
--- a/vm.c
+++ b/vm.c
@@ -199,21 +199,21 @@ static match_t *_match(grammar_t *g, const char *str, vm_op_t *op, recursive_ref
             }
             match_t *before = _match(g, str - backtrack, op->args.pat, rec);
             if (before == NULL) return NULL;
-            destroy_match(&before);
             match_t *m = calloc(sizeof(match_t), 1);
             m->start = str;
             m->end = str;
             m->op = op;
+            m->child = before;
             return m;
         }
         case VM_BEFORE: {
             match_t *after = _match(g, str, op->args.pat, rec);
             if (after == NULL) return NULL;
-            destroy_match(&after);
             match_t *m = calloc(sizeof(match_t), 1);
             m->start = str;
             m->end = str;
             m->op = op;
+            m->child = after;
             return m;
         }
         case VM_CAPTURE: {
@@ -511,6 +511,10 @@ void print_match(match_t *m, const char *color, int verbose)
         //    printf("\033[0;2;33m[%s:", name);
         const char *prev = m->start;
         for (match_t *child = m->child; child; child = child->nextsibling) {
+            // Skip children from e.g. zero-width matches like >@foo
+            if (!(m->start <= child->start && child->start <= m->end &&
+                  m->start <= child->end && child->end <= m->end))
+                continue;
             if (child->start > prev)
                 printf("%s%.*s", color ? color : "", (int)(child->start - prev), prev);
             print_match(child, color ? (m->is_capture ? "\033[0;31;1m" : color) : NULL, verbose);
-- 
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