From 622653daa9e991e9608852210034a4e09cb94167 Mon Sep 17 00:00:00 2001
From: bjculkin <bjculkin@mix.wvu.edu>
Date: Thu, 6 Apr 2017 14:14:26 -0400
Subject: Add string editor.

The operations are very heavily inspired by the 'Sam' editor
---
 .../java/bjc/utils/ioutils/RegexStringEditor.java  | 146 +++++++++++++++++++++
 1 file changed, 146 insertions(+)
 create mode 100644 BJC-Utils2/src/main/java/bjc/utils/ioutils/RegexStringEditor.java

diff --git a/BJC-Utils2/src/main/java/bjc/utils/ioutils/RegexStringEditor.java b/BJC-Utils2/src/main/java/bjc/utils/ioutils/RegexStringEditor.java
new file mode 100644
index 0000000..2825346
--- /dev/null
+++ b/BJC-Utils2/src/main/java/bjc/utils/ioutils/RegexStringEditor.java
@@ -0,0 +1,146 @@
+package bjc.utils.ioutils;
+
+import bjc.utils.functypes.ID;
+
+import java.util.function.UnaryOperator;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+/**
+ * Editor methods for strings based off the command language for the Sam editor.
+ * 
+ * @author EVE
+ *
+ */
+public class RegexStringEditor {
+	/**
+	 * Replace every occurrence of the pattern with the result of applying
+	 * the action to the string matched by the pattern.
+	 * 
+	 * @param input
+	 *                The input string to process.
+	 * 
+	 * @param patt
+	 *                The pattern to match the string against.
+	 * 
+	 * @param action
+	 *                The action to transform matches with.
+	 * 
+	 * @return The string, with matches replaced with the action.
+	 */
+	public static String onOccurances(String input, Pattern patt, UnaryOperator<String> action) {
+		return occurances(input, patt, ID.id(), action);
+	}
+
+	/**
+	 * Replace every occurrence between the patterns with the result of
+	 * applying the action to the strings between the patterns.
+	 * 
+	 * @param input
+	 *                The input string to process.
+	 * 
+	 * @param patt
+	 *                The pattern to match the string against.
+	 * 
+	 * @param action
+	 *                The action to transform matches with.
+	 * 
+	 * @return The string, with strings between the matches replaced with
+	 *         the action.
+	 */
+	public static String betweenOccurances(String input, Pattern patt, UnaryOperator<String> action) {
+		return occurances(input, patt, action, ID.id());
+	}
+
+	/**
+	 * Execute actions between and on matches of a regular expression.
+	 * 
+	 * @param input
+	 *                The input string.
+	 * 
+	 * @param patt
+	 *                The pattern to match against the string.
+	 * 
+	 * @param betweenAction
+	 *                The function to execute between matches of the string.
+	 * 
+	 * @param onAction
+	 *                The function to execute on matches of the string.
+	 * 
+	 * @return The string, with both actions applied.
+	 */
+	public static String occurances(String input, Pattern patt, UnaryOperator<String> betweenAction,
+			UnaryOperator<String> onAction) {
+		Matcher matcher = patt.matcher(input);
+
+		StringBuffer res = new StringBuffer();
+
+		StringBuffer work = new StringBuffer();
+
+		while(matcher.find()) {
+			String match = matcher.group();
+
+			matcher.appendReplacement(work, "");
+
+			res.append(betweenAction.apply(matcher.toString()));
+			res.append(onAction.apply(match));
+
+			work = new StringBuffer();
+		}
+
+		matcher.appendTail(work);
+
+		res.append(betweenAction.apply(work.toString()));
+
+		return res.toString();
+	}
+
+	/**
+	 * Apply an operation to a string if it matches a regular expression.
+	 * 
+	 * @param input
+	 *                The input string.
+	 * 
+	 * @param patt
+	 *                The pattern to match against it.
+	 * 
+	 * @param action
+	 *                The action to execute if it matches.
+	 * 
+	 * @return The string, modified by the action if the pattern matched.
+	 */
+	public static String ifMatches(String input, Pattern patt, UnaryOperator<String> action) {
+		Matcher matcher = patt.matcher(input);
+
+		if(matcher.matches()) {
+			return action.apply(input);
+		} else {
+			return input;
+		}
+	}
+
+	/**
+	 * Apply an operation to a string if it matches a regular expression.
+	 * 
+	 * @param input
+	 *                The input string.
+	 * 
+	 * @param patt
+	 *                The pattern to match against it.
+	 * 
+	 * @param action
+	 *                The action to execute if it doesn't match.
+	 * 
+	 * @return The string, modified by the action if the pattern didn't
+	 *         match.
+	 */
+	public static String ifNotMatches(String input, Pattern patt, UnaryOperator<String> action) {
+		Matcher matcher = patt.matcher(input);
+
+		if(matcher.matches()) {
+			return input;
+		} else {
+			return action.apply(input);
+		}
+	}
+}
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