From 4c0f972c4616eb549a098c3ef40d527eb542d7a6 Mon Sep 17 00:00:00 2001
From: Ben Culkin <scorpress@gmail.com>
Date: Sat, 21 Nov 2020 16:51:04 -0500
Subject: Add basic pattern matching

Adds a basic pattern matching implementation. Not perfect, but pretty
good, considering what we have to work with
---
 .../java/bjc/utils/patterns/SimplePatttern.java    | 40 ++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 base/src/main/java/bjc/utils/patterns/SimplePatttern.java

(limited to 'base/src/main/java/bjc/utils/patterns/SimplePatttern.java')

diff --git a/base/src/main/java/bjc/utils/patterns/SimplePatttern.java b/base/src/main/java/bjc/utils/patterns/SimplePatttern.java
new file mode 100644
index 0000000..1601894
--- /dev/null
+++ b/base/src/main/java/bjc/utils/patterns/SimplePatttern.java
@@ -0,0 +1,40 @@
+package bjc.utils.patterns;
+
+import bjc.data.*;
+
+/**
+ * A simpler form of a pattern.
+ * 
+ * @author Ben Culkin
+ *
+ * @param <ReturnType> The type returned by matching the pattern.
+ */
+public interface SimplePatttern<ReturnType> extends Pattern<ReturnType, Void> {
+	/**
+	 * Test if this pattern does match a given object.
+	 * 
+	 * @param input The object to test against.
+	 * 
+	 * @return Whether the object matches this pattern.
+	 */
+	boolean doesMatch(Object input);
+
+	/**
+	 * Applies this pattern to the input object.
+	 * 
+	 * @param input The object that passed the condition.
+	 * 
+	 * @return The result of applying this action to the input.
+	 */
+	ReturnType doApply(Object input);
+	
+	@Override
+	default ReturnType apply(Object input, Void state) {
+		return doApply(input);
+	}
+	
+	@Override
+	default IPair<Boolean, Void> matches(Object input) {
+		return new Pair<>(doesMatch(input), null);
+	}
+}
\ No newline at end of file
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