From 019e3cf1cd22a7af2f52f8c26cfa3312fe3ae96b Mon Sep 17 00:00:00 2001
From: "Sven M. Hallberg" <pesco@khjk.org>
Date: Mon, 17 Feb 2020 13:05:32 +0100
Subject: [PATCH] properly print empty choices
---
src/cfgrammar.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/src/cfgrammar.c b/src/cfgrammar.c
index f9ece03..e24c8b2 100644
--- a/src/cfgrammar.c
+++ b/src/cfgrammar.c
@@ -823,13 +823,15 @@ static void pprint_ntrules(FILE *f, const HCFGrammar *g, const HCFChoice *nt,
fputs(name, f);
i += strlen(name);
for(; i<column; i++) fputc(' ', f);
- fputs(" ->", f);
assert(nt->type == HCF_CHOICE);
HCFSequence **p = nt->seq;
if (*p == NULL) {
- return; // shouldn't happen
+ fputs(" -x\n", f); // empty choice, e.g. h_nothing_p()
+ return;
}
+
+ fputs(" ->", f);
pprint_sequence(f, g, *p++); // print first production on the same line
for(; *p; p++) { // print the rest below with "or" bars
for(i=0; i<column; i++) fputc(' ', f); // indent
--
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