[vala] Genie: Fix assertion failure on large rollback in parser

[Jamie McCracken <jamiemcc src gnome org>]

commit e7d524d32a8fd3a77207766bc7dd5031ec3cdc21
Author: Jamie McCracken <jamie.mccrack gmail com>
Date:   Mon May 24 14:51:59 2010 -0400

    Genie: Fix assertion failure on large rollback in parser

 vala/valagenieparser.vala  |   15 ++++++++++++++-
 vala/valageniescanner.vala |    9 +++++++++
 2 files changed, 23 insertions(+), 1 deletions(-)
---
diff --git a/vala/valagenieparser.vala b/vala/valagenieparser.vala
index a1305ea..18bf146 100644
--- a/vala/valagenieparser.vala
+++ b/vala/valagenieparser.vala
@@ -200,7 +200,15 @@ public class Vala.Genie.Parser : CodeVisitor {
 
 	void rollback (SourceLocation location) {
 		while (tokens[index].begin.pos != location.pos) {
-			prev ();
+			index = (index - 1 + BUFFER_SIZE) % BUFFER_SIZE;
+			size++;
+			if (size > BUFFER_SIZE) {
+				scanner.seek (location);
+				size = 0;
+				index = 0;
+
+				next ();
+			}
 		}
 	}
 
@@ -1012,6 +1020,11 @@ public class Vala.Genie.Parser : CodeVisitor {
 		do {
 			if (!first) {
  				// array of arrays: new T[][42]
+ 				
+ 				if (size_specified) {
+					throw new ParseError.SYNTAX (get_error ("size of inner arrays must not be specified in array creation expression"));
+				}
+ 				
 				etype = new ArrayType (etype, size_specifier_list.size, etype.source_reference);
 			} else {
 				first = false;
diff --git a/vala/valageniescanner.vala b/vala/valageniescanner.vala
index aacc3ed..5c2bb6d 100644
--- a/vala/valageniescanner.vala
+++ b/vala/valageniescanner.vala
@@ -103,6 +103,15 @@ public class Vala.Genie.Scanner {
 	bool is_ident_char (char c) {
 		return (c.isalnum () || c == '_');
 	}
+	
+	public void seek (SourceLocation location) {
+		current = location.pos;
+		line = location.line;
+		column = location.column;
+
+		conditional_stack = null;
+		state_stack = null;
+	}
 
 	TokenType get_identifier_or_keyword (char* begin, int len) {
 		switch (len) {