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Fix string.gsub behaviour with negative n

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This commit is contained in:
Enrico Horn
2021-07-09 23:46:34 +02:00
parent 6b9dece367
commit 560a4694e4
5 changed files with 5 additions and 0 deletions
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2
luaj-core/src/main/java/org/luaj/vm2/lib/StringLib.java
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@@ -640,6 +640,8 @@ public class StringLib extends TwoArgFunction {
int lastmatch = -1; /* end of last match */ int lastmatch = -1; /* end of last match */
LuaValue repl = args.arg(3); LuaValue repl = args.arg(3);
int max_s = args.optint(4, srclen+1); int max_s = args.optint(4, srclen+1);
if (max_s < 0)
max_s = srclen+1;
final boolean anchor = p.length() > 0 && p.charAt(0) == '^'; final boolean anchor = p.length() > 0 && p.charAt(0) == '^';
Buffer lbuf = new Buffer(srclen); Buffer lbuf = new Buffer(srclen);

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luaj-test/src/test/resources/compatibility/jme/stringlib.out
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luaj-test/src/test/resources/compatibility/jse/stringlib.out
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luaj-test/src/test/resources/compatibility/luajit/stringlib.out
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3
luaj-test/src/test/resources/compatibility/stringlib.lua
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@@ -21,6 +21,9 @@ print( string.match( "abbaaababaabaaabaa", "b(a*)()b", 12 ) )
print( string.byte("hi", -3) ) print( string.byte("hi", -3) )
print( string.gsub("ABC ABC ABC", "ABC", "DEF", -1) )
print( string.gsub("ABC ABC ABC", "ABC", "DEF", 0) )
print( string.gsub("ABC ABC ABC", "ABC", "DEF", 2) )
print( string.gsub("ABC", "@(%x+)", function(s) return "|abcd" end) ) print( string.gsub("ABC", "@(%x+)", function(s) return "|abcd" end) )
print( string.gsub("@123", "@(%x+)", function(s) return "|abcd" end) ) print( string.gsub("@123", "@(%x+)", function(s) return "|abcd" end) )
print( string.gsub("ABC@123", "@(%x+)", function(s) return "|abcd" end) ) print( string.gsub("ABC@123", "@(%x+)", function(s) return "|abcd" end) )