Use JavaUnicodeInputStream for proper handling of Unicode escape sequences in Java source code
Proper Unicode identifier handling
Report file names with lexer errors
Use explicit groups so the ATN can collapse sets
Add keywords as explicit lexer rules; enum and assert are always keywords (could extend JavaLexer and override emit to change this behavior)
'true' and 'false' are both lexed as a BooleanLiteral token
Improved support for Java 7 numeric literals
Add NullLiteral to the lexer
Add separators and operators to the lexer
Add unambiguous shift and comparison operators to the lexer
Clean up character and string literals in the lexer
Some additional lexer tweaks
Merge pull request #253 from sharwell/java7-grammars

Java 7 grammars
Merge branch 'master' of github.com:antlr/antlr4