From 7ec3c01eb4fa8251cb1481d39c6270bf589553a7 Mon Sep 17 00:00:00 2001
From: Ulya Trofimovich <skvadrik@gmail.com>
Date: Fri, 3 Mar 2017 01:21:53 +0000
Subject: [PATCH] Prepare default tags insertion for non-sequential tag
 enumeration.

This will be needed when we add POSIX captures: opening and closing
capture tags must have sequential numbers, but the tags may be located
far from each other in the regexp tree (other tags are possible on
the way from the opening tag to the closing tag).
---
 re2c/src/ir/re/default_tags.cc | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/re2c/src/ir/re/default_tags.cc b/re2c/src/ir/re/default_tags.cc
index 2253f030..ef98b396 100644
--- a/re2c/src/ir/re/default_tags.cc
+++ b/re2c/src/ir/re/default_tags.cc
@@ -2,22 +2,22 @@
 
 namespace re2c {
 
-static void insert_default_tags(RESpec &spec, RE *re, size_t &tidx)
+static void insert_default_tags(RESpec &spec, RE *re, size_t *&tidx)
 {
 	RE::alc_t &alc = spec.alc;
 	switch (re->type) {
 		case RE::NIL: break;
 		case RE::SYM: break;
 		case RE::ALT: {
-			size_t i = tidx;
+			size_t *i = tidx;
 			RE *x = re_nil(alc), *y = re_nil(alc);
 			insert_default_tags(spec, re->alt.re1, tidx);
 			for (; i < tidx; ++i) {
-				x = re_cat(alc, x, re_tag(alc, i, true));
+				x = re_cat(alc, x, re_tag(alc, *i, true));
 			}
 			insert_default_tags(spec, re->alt.re2, tidx);
 			for (; i < tidx; ++i) {
-				y = re_cat(alc, y, re_tag(alc, i, true));
+				y = re_cat(alc, y, re_tag(alc, *i, true));
 			}
 			re->alt.re1 = re_cat(alc, re->alt.re1, y);
 			re->alt.re2 = re_cat(alc, re->alt.re2, x);
@@ -31,21 +31,21 @@ static void insert_default_tags(RESpec &spec, RE *re, size_t &tidx)
 			insert_default_tags(spec, re->iter.re, tidx);
 			break;
 		case RE::TAG:
-			assert(re->tag.idx == tidx);
-			++tidx;
+			*tidx++ = re->tag.idx;
 			break;
 	}
 }
 
 void insert_default_tags(RESpec &spec)
 {
-	size_t tidx = 0;
+	size_t *tidx0 = new size_t[spec.tags.size()], *tidx = tidx0;
 	std::vector<RE*>::iterator
 		i = spec.res.begin(),
 		e = spec.res.end();
 	for (; i != e; ++i) {
 		insert_default_tags(spec, *i, tidx);
 	}
+	delete[] tidx0;
 }
 
 } // namespace re2c
-- 
2.40.0