grounditems: manually match item thresholds

The regex used was explosive and wouldn't complete with large inputs
that can appear when the user has a mildly corrupted config

runelite-client/src/main/java/net/runelite/client/plugins/grounditems/ItemThreshold.java

@@ -25,8 +25,6 @@
 package net.runelite.client.plugins.grounditems;
 
 import com.google.common.base.Strings;
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;
 import lombok.Value;
 
 @Value
@@ -38,8 +36,6 @@ class ItemThreshold
 		MORE_THAN
 	}
 
-	private static final Pattern QUANTITY_THRESHOLD_PATTERN = Pattern.compile("(.+)(<|>)\\s*(\\d+)");
-
 	private final String itemName;
 	private final int quantity;
 	private final Inequality inequality;
@@ -51,19 +47,40 @@ class ItemThreshold
 			return null;
 		}
 
-		Matcher matcher = QUANTITY_THRESHOLD_PATTERN.matcher(entry);
+		Inequality operator = Inequality.MORE_THAN;
+		int qty = 0;
 
-		if (matcher.find())
+		for (int i = entry.length() - 1; i >= 0; i--)
 		{
-			String name = matcher.group(1).trim();
-			String sign = matcher.group(2);
-			int quantity = Integer.parseInt(matcher.group(3));
-			Inequality inequality = sign.equals("<") ? Inequality.LESS_THAN : Inequality.MORE_THAN;
-
-			return new ItemThreshold(name, quantity, inequality);
+			char c = entry.charAt(i);
+			if (c >= '0' && c <= '9' || Character.isWhitespace(c))
+			{
+				continue;
+			}
+			switch (c)
+			{
+				case '<':
+					operator = Inequality.LESS_THAN;
+					// fallthrough
+				case '>':
+					if (i + 1 < entry.length())
+					{
+						try
+						{
+							qty = Integer.parseInt(entry.substring(i + 1).trim());
+						}
+						catch (NumberFormatException e)
+						{
+							qty = 0;
+							operator = Inequality.MORE_THAN;
+						}
+						entry = entry.substring(0, i);
+					}
+			}
+			break;
 		}
 
-		return new ItemThreshold(entry, 0, Inequality.MORE_THAN);
+		return new ItemThreshold(entry.trim(), qty, operator);
 	}
 
 	boolean quantityHolds(int itemCount)

runelite-client/src/test/java/net/runelite/client/plugins/grounditems/ItemThresholdTest.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2020 Abex
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package net.runelite.client.plugins.grounditems;
+
+import joptsimple.internal.Strings;
+import org.junit.Assert;
+import static net.runelite.client.plugins.grounditems.ItemThreshold.Inequality.*;
+import org.junit.Test;
+
+public class ItemThresholdTest
+{
+	@Test
+	public void test()
+	{
+		Assert.assertEquals(ItemThreshold.fromConfigEntry("Dharok's platebody 100"), new ItemThreshold("Dharok's platebody 100", 0, MORE_THAN));
+		Assert.assertEquals(ItemThreshold.fromConfigEntry("Dharok's platebody 100<100"), new ItemThreshold("Dharok's platebody 100", 100, LESS_THAN));
+		Assert.assertEquals(ItemThreshold.fromConfigEntry("Dharok's platebody > 100"), new ItemThreshold("Dharok's platebody", 100, MORE_THAN));
+		Assert.assertEquals(ItemThreshold.fromConfigEntry("Dharok's platebody < 10 0"), new ItemThreshold("Dharok's platebody", 0, MORE_THAN));
+	}
+
+	@Test(timeout = 100)
+	public void testExplosive()
+	{
+		String name = "archer" + Strings.repeat('e', 50000) + "s ring";
+		Assert.assertEquals(ItemThreshold.fromConfigEntry(name + " < 387"), new ItemThreshold(name, 387, LESS_THAN));
+	}
+}

runelite-client/src/test/java/net/runelite/client/plugins/grounditems/WildcardMatchLoaderTest.java

@@ -25,6 +25,7 @@
 package net.runelite.client.plugins.grounditems;
 
 import java.util.Arrays;
+import joptsimple.internal.Strings;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 import org.junit.Test;
@@ -53,4 +54,13 @@ public class WildcardMatchLoaderTest
 		assertFalse(loader.load(new NamedQuantity("Abyssal dagger", 1)));
 		assertTrue(loader.load(new NamedQuantity("Rune Longsword", 2)));
 	}
+
+	@Test(timeout = 1000)
+	public void testExplosive()
+	{
+		String name = "archer" + Strings.repeat('e', 50000) + "s ring";
+		WildcardMatchLoader loader = new WildcardMatchLoader(Arrays.asList(name + "* < 100"));
+		assertTrue(loader.load(new NamedQuantity(name, 50)));
+		assertFalse(loader.load(new NamedQuantity(name, 150)));
+	}
 }