From d86cbcbabc4b251956bd2c5bf4dfa459a00bb239 Mon Sep 17 00:00:00 2001
From: bculkin2442 <bjculkin@mix.wvu.edu>
Date: Tue, 18 Jun 2019 17:44:32 -0400
Subject: Lots of frontend work

---
 src/main/java/bjc/everge/StringUtils.java | 65 +++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 src/main/java/bjc/everge/StringUtils.java

(limited to 'src/main/java/bjc/everge/StringUtils.java')

diff --git a/src/main/java/bjc/everge/StringUtils.java b/src/main/java/bjc/everge/StringUtils.java
new file mode 100644
index 0000000..3f19b8f
--- /dev/null
+++ b/src/main/java/bjc/everge/StringUtils.java
@@ -0,0 +1,65 @@
+package bjc.everge;
+
+import java.util.Arrays;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Utility methods for strings.
+ *
+ * @author Ben Culkin.
+ */
+public class StringUtils {
+	/**
+	 * Split a string on every occurance of a string not preceeded by an escape.
+	 *
+	 * @param escape
+	 * 		The escape that stops splitting.
+	 * @param splat
+	 * 		The string to split on.
+	 * @param inp
+	 * 		The string to split.
+	 * @return The string split as specified above.
+	 */
+	public static String[] escapeSplit(String escape, String splat, String inp) {
+		if (escape == null || escape.equals("")) {
+			return inp.split(splat);
+		}
+
+		List<String> ret = new ArrayList<>();
+
+		String wrk = inp;
+		int idx = wrk.indexOf(splat);
+
+		// System.err.printf("[DEBUG] 'hard' escapeSplit: (%s) (%s) (%s) init: %d\n",
+		// 		escape, splat, inp, idx);
+
+		while (idx != -1) {
+			while (idx != -1 && wrk.regionMatches(idx - 1, escape, 0, escape.length())) {
+				int oidx = wrk.indexOf(splat, idx + 1);
+				// System.err.printf("[TRACE] idx: %d, oidx: %d\n", idx, oidx);
+				idx = oidx;
+			}
+		
+			if (idx == -1) {
+				break;
+			}
+
+			// System.err.printf("[TRACE] sliced string into (%s) and (%s) at %d\n",
+			// 		wrk.substring(0, idx), wrk.substring(idx), idx);
+			String tmp = wrk.substring(0, idx);
+			ret.add(tmp);
+			if (wrk.endsWith(tmp)) {
+				wrk = "";
+			} else {
+				wrk = wrk.substring(idx + splat.length());
+			}
+
+			idx = wrk.indexOf(splat);
+		}
+
+		if (!wrk.equals("")) ret.add(wrk);
+
+		return ret.toArray(new String[0]);
+	}
+}
-- 
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