From bae9ba9e7aa1e58ccbf9abf6b321309625762ebf Mon Sep 17 00:00:00 2001
From: gnosygnu <gnosygnu@gmail.com>
Date: Mon, 17 Feb 2020 08:47:34 -0500
Subject: [PATCH] Parser: Return length of 0 for empty arrays [#668]

---
 .../src/gplx/xowa/parsers/Xop_parser.java     |  1 +
 .../src/gplx/xowa/parsers/Xop_parser_tst.java | 47 +++++++++++++++++++
 2 files changed, 48 insertions(+)
 create mode 100644 400_xowa/src/gplx/xowa/parsers/Xop_parser_tst.java

diff --git a/400_xowa/src/gplx/xowa/parsers/Xop_parser.java b/400_xowa/src/gplx/xowa/parsers/Xop_parser.java
index 2889d1587..1bb67a445 100644
--- a/400_xowa/src/gplx/xowa/parsers/Xop_parser.java
+++ b/400_xowa/src/gplx/xowa/parsers/Xop_parser.java
@@ -120,6 +120,7 @@ public class Xop_parser {	// NOTE: parsers are reused; do not keep any read-writ
 		ctx.Parse_tid_(parse_tid_old);
 	}
 	public int Parse_to_src_end(Xop_root_tkn root, Xop_ctx ctx, Xop_tkn_mkr tkn_mkr, byte[] src, Btrie_fast_mgr trie, int pos, int len) {
+		if (Bry_.Len_eq_0(src)) return 0; // if empty array, return 0, else IndexError; PAGE:commons.wikimedia.org/wiki/File:England_in_the_UK_and_Europe.svg; ISSUE#:668; DATE:2020-02-17
 		byte b = pos == -1 ? Byte_ascii.Nl : src[pos];	// simulate newLine at bgn of src; needed for lxrs which rely on \n (EX: "=a=")
 		int txt_bgn = pos == -1 ? 0 : pos; Xop_tkn_itm txt_tkn = null;
 		Btrie_rv trv = new Btrie_rv();
diff --git a/400_xowa/src/gplx/xowa/parsers/Xop_parser_tst.java b/400_xowa/src/gplx/xowa/parsers/Xop_parser_tst.java
new file mode 100644
index 000000000..8ee03276d
--- /dev/null
+++ b/400_xowa/src/gplx/xowa/parsers/Xop_parser_tst.java
@@ -0,0 +1,47 @@
+/*
+XOWA: the XOWA Offline Wiki Application
+Copyright (C) 2012-2017 gnosygnu@gmail.com
+
+XOWA is licensed under the terms of the General Public License (GPL) Version 3,
+or alternatively under the terms of the Apache License Version 2.0.
+
+You may use XOWA according to either of these licenses as is most appropriate
+for your project on a case-by-case basis.
+
+The terms of each license can be found in the source code repository:
+
+GPLv3 License: https://github.com/gnosygnu/xowa/blob/master/LICENSE-GPLv3.txt
+Apache License: https://github.com/gnosygnu/xowa/blob/master/LICENSE-APACHE2.txt
+*/
+package gplx.xowa.parsers; import gplx.*; import gplx.xowa.*;
+import org.junit.*; import gplx.core.tests.*;
+import gplx.core.btries.*;
+public class Xop_parser_tst {
+	private final    Xop_parser_fxt fxt = new Xop_parser_fxt();
+	@Test  public void Parse_to_src_end() {// if empty array, return 0, else IndexError; PAGE:commons.wikimedia.org/wiki/File:England_in_the_UK_and_Europe.svg; ISSUE#:668; DATE:2020-02-17
+		fxt.Test__Parse_to_src_end("", 0, Bool_.Y, 0);
+	}
+}
+class Xop_parser_fxt {
+	private Xoae_app app;
+	private Xowe_wiki wiki;
+	private Xop_lxr_mgr tmpl_lxr_mgr, wiki_lxr_mgr;
+	public Xop_parser_fxt() {
+		this.app = Xoa_app_fxt.Make__app__edit();
+		this.wiki = Xoa_app_fxt.Make__wiki__edit(app);
+		tmpl_lxr_mgr = Xop_lxr_mgr.new_tmpl_();
+		wiki_lxr_mgr = Xop_lxr_mgr.new_wiki_();
+	}
+	public void Test__Parse_to_src_end(String src_str, int pos, boolean parse_is_tmpl, int expd)  {
+		// init
+		byte[] src = Bry_.new_u8(src_str);
+		Xop_ctx ctx = Xop_ctx.New__top(wiki);
+		Xop_tkn_mkr tkn_mkr = ctx.Tkn_mkr();
+		Xop_root_tkn root = tkn_mkr.Root(src);
+		Xop_parser parser = wiki.Parser_mgr().Main();
+		Btrie_fast_mgr trie = parse_is_tmpl ? tmpl_lxr_mgr.Trie() : wiki_lxr_mgr.Trie();
+
+		int actl = parser.Parse_to_src_end(root, ctx, tkn_mkr, src, trie, pos, src.length);
+            Gftest.Eq__int(expd, actl);
+	}
+}