From f9752a872ad68a47b872eccb953332d372052cac Mon Sep 17 00:00:00 2001
From: bculkin2442 <bjculkin@mix.wvu.edu>
Date: Thu, 16 Feb 2017 08:36:43 -0500
Subject: Preprocessor and better strings

---
 dice-lang/src/bjc/dicelang/v2/Define.java | 93 +++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 dice-lang/src/bjc/dicelang/v2/Define.java

(limited to 'dice-lang/src/bjc/dicelang/v2/Define.java')

diff --git a/dice-lang/src/bjc/dicelang/v2/Define.java b/dice-lang/src/bjc/dicelang/v2/Define.java
new file mode 100644
index 0000000..4617931
--- /dev/null
+++ b/dice-lang/src/bjc/dicelang/v2/Define.java
@@ -0,0 +1,93 @@
+package bjc.dicelang.v2;
+
+import bjc.utils.data.CircularIterator;
+
+import java.util.Iterator;
+import java.util.function.UnaryOperator;
+import java.util.regex.Pattern;
+import java.util.regex.Matcher;
+
+public class Define implements UnaryOperator<String> {
+	public static enum Type {
+		LINE, TOKEN
+	}
+
+	int priority;
+
+	boolean doRecur;
+	boolean subType;
+
+	Pattern predicate;
+	Pattern searcher;
+
+	Iterator<String>  replacers;
+	String replacer;
+
+	public Define(int priorty, boolean isSub, boolean recur,
+			String predicte, String searchr, Iterable<String> replacrs) {
+		priority = priorty;
+		doRecur  = recur;
+		subType  = isSub;
+
+		if(predicte != null) {
+			predicate = Pattern.compile(predicte);
+		}
+		searcher  = Pattern.compile(searchr);
+
+		if(subType) {
+			if(replacrs.iterator().hasNext()) {
+				replacers = new CircularIterator<>(replacrs);
+			} else {
+				replacers = null;
+			}
+		} else {
+			Iterator<String> itr = replacrs.iterator();
+
+			if(itr.hasNext()) replacer  = itr.next();
+			else              replacer  = "";
+		}
+	}
+
+	public String apply(String tok) {
+		if(predicate != null) {
+			if(!predicate.matcher(tok).matches()) {
+				return tok;
+			}
+		}
+
+		String strang = doPass(tok);
+
+		if(doRecur) {
+			if(strang.equals(tok)) {
+				return strang;
+			} else {
+				String oldStrang = strang;
+
+				do {
+					strang = doPass(tok);
+				} while(!strang.equals(oldStrang));
+			}
+		}
+
+		return strang;
+	}
+
+	private String doPass(String tok) {
+		Matcher searcherMatcher = searcher.matcher(tok);
+
+		if(subType) {
+			StringBuffer sb = new StringBuffer();
+
+			while(searcherMatcher.find()) {
+				if(replacers == null) searcherMatcher.appendReplacement(sb,"");
+				else                  searcherMatcher.appendReplacement(sb, replacers.next());
+			}
+			
+			searcherMatcher.appendTail(sb);
+
+			return sb.toString();
+		} else {
+			return searcherMatcher.replaceAll(replacer);
+		}
+	}
+}
-- 
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