From 3a818da77acf50e7ea0d2c02d669cb67b9f114e3 Mon Sep 17 00:00:00 2001
From: Ben Culkin <scorpress@gmail.com>
Date: Tue, 6 Oct 2020 20:05:00 -0400
Subject: Add unit tests for defines

Adds unit tests for SimpleDefine and IteratedDefine.

This also fixes an issue with IteratedDefine, where once you had
consumed a replacer, it was consumed for good; you couldn't use it in
the future, even in a different call to apply().

This was fixed through the introduction of a new iterator type from
esodata - ResettableIterator. See that project/type for more details on
what exactly this does; but suffice to say, it allows to restore our
iterator and re-iterate over the same elements on every call to apply.
---
 .../utils/parserutils/defines/IteratedDefine.java  | 46 +++++++++++++++++++++-
 .../utils/parserutils/defines/SimpleDefine.java    | 12 ++++++
 2 files changed, 56 insertions(+), 2 deletions(-)

(limited to 'base/src/main/java/bjc/utils/parserutils')

diff --git a/base/src/main/java/bjc/utils/parserutils/defines/IteratedDefine.java b/base/src/main/java/bjc/utils/parserutils/defines/IteratedDefine.java
index 2dad9c6..8bed45c 100644
--- a/base/src/main/java/bjc/utils/parserutils/defines/IteratedDefine.java
+++ b/base/src/main/java/bjc/utils/parserutils/defines/IteratedDefine.java
@@ -7,6 +7,7 @@ import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
 import bjc.data.CircularIterator;
+import bjc.data.ResettableIterator;
 
 /**
  * An iterated find/replace, using a circular assortment of replacements.
@@ -16,7 +17,7 @@ import bjc.data.CircularIterator;
 public class IteratedDefine implements UnaryOperator<String> {
 	private Pattern patt;
 
-	private Iterator<String> repls;
+	private ResettableIterator<String> repls;
 
 	/**
 	 * Create a new iterated define.
@@ -32,15 +33,56 @@ public class IteratedDefine implements UnaryOperator<String> {
 	public IteratedDefine(Pattern pattern, boolean circular, String... replacers) {
 		patt = pattern;
 
-		repls = new CircularIterator<>(Arrays.asList(replacers), circular);
+		Iterator<String> tmp = new CircularIterator<>(Arrays.asList(replacers), circular);
+		repls = new ResettableIterator<>(tmp);
+	}
+
+	/**
+	 * Create a new iterated define.
+	 *
+	 * @param pattern
+	 *                  The pattern to use for matching.
+	 * @param circular
+	 *                  Whether or not to loop through the list of replacers, or
+	 *                  just repeat the last one.
+	 * @param replacers
+	 *                  The set of replacement strings to use.
+	 */
+	public IteratedDefine(String pattern, boolean circular, String... replacers) {
+		this(Pattern.compile(pattern), circular, replacers);
 	}
 
 	@Override
 	public String apply(String ln) {
+		/*
+		 * NOTE Oct 6 2020 - Ben Culkin - Should this be configurable to do/not do?
+		 */
+
+		/*
+		 * Reset the iterator. This means that the fact that you iterated over a
+		 * replacer previously, doesn't keep it from being used again.
+		 */
+		repls.reset();
+
 		Matcher mat = patt.matcher(ln);
 		StringBuffer sb = new StringBuffer();
 
 		while (mat.find()) {
+			/*
+			 * @NOTE Oct 6, 2020 - Ben Culkin
+			 * 
+			 * Policy question here. Should we throw an exception if we exhaust our
+			 * replacers and we weren't supposed to?
+			 * 
+			 * Other alternatives are:
+			 * 
+			 * a) Default to the empty string
+			 * 
+			 * b) Keep the last valid replacer. This seems to be what we do as of now, per
+			 * the behavior of CircularIterator.
+			 * 
+			 * c) Use the replacer "$0", which is the same as not doing a replace at all
+			 */
 			String repl = repls.next();
 
 			mat.appendReplacement(sb, repl);
diff --git a/base/src/main/java/bjc/utils/parserutils/defines/SimpleDefine.java b/base/src/main/java/bjc/utils/parserutils/defines/SimpleDefine.java
index b31d937..f20e22a 100644
--- a/base/src/main/java/bjc/utils/parserutils/defines/SimpleDefine.java
+++ b/base/src/main/java/bjc/utils/parserutils/defines/SimpleDefine.java
@@ -26,6 +26,18 @@ public class SimpleDefine implements UnaryOperator<String> {
 
 		repl = replace;
 	}
+	
+	/**
+	 * Create a new simple define.
+	 *
+	 * @param pattern
+	 *                The pattern to match against.
+	 * @param replace
+	 *                The text to use as a replacement.
+	 */
+	public SimpleDefine(String pattern, String replace) {
+		this(Pattern.compile(pattern), replace);
+	}
 
 	@Override
 	public String apply(String line) {
-- 
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