Improve context on syntax errors.

git-svn-id: https://piraha-peg.googlecode.com/svn/trunk@98 1a70d7c6-ffe7-ef14-4583-3269c1a2e543
stevenrbrandt · Dec 5, 2014 · faed3b1 · faed3b1
1 parent 0f34857
commit faed3b1
Showing 1 changed file with 5 additions and 2 deletions.
diff --git a/src/edu/lsu/cct/piraha/Near.java b/src/edu/lsu/cct/piraha/Near.java
@@ -7,8 +7,11 @@ public class Near {
 	public int lineNum=1, pos, startOfLine, endOfLine;
 	public Near() {}
 	public String toString() {
-		String line = text.substring(startOfLine,endOfLine);
-		String str = line.substring(0,pos)+"|"+line.substring(pos);
+		int lstart = startOfLine - 50;
+		if(lstart < 0) lstart = 0;
+		int npos = pos + startOfLine - lstart;
+		String line = text.substring(lstart,endOfLine);
+		String str = line.substring(0,npos)+"|"+line.substring(npos);
 		String base = "";
 		if(expected != null) {
 			if(expected.possibilities.size()==1) {