ANTLR 4.5.1 发布，词法分析工具

renyanping

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　　ANTLR 4.5.1 发布在7月15日发布了，下载地址：http://www.antlr.org/download/antlr-4.5.1-complete.jar
　　改进记录：
Summary of Major Changes

• 　　Maven build was added back in, thanks to new contributor Jason van Zyl; you can just open the topmost pom.xml in your favorite IDE
  
• 　　We completely overhauled runtime test generation
  
• 　　We merged all existing target repositories such as antlr4-python2 into the main antlr4repo so that everything is now included in a single spot.
  
• 　　We removed runtime jar dependency on Swing. Class org.antlr.v4.runtime.misc.TestRighas moved to org.antlr.v4.gui.TestRig but we left a proxy in so thatorg.antlr.v4.runtime.misc.TestRig still works. The org.antlr.v4.runtime.tree.guipackage moved to org.antlr.v4.gui in the tool area from the runtime. A few classes fromorg.antlr.v4.runtime.misc had to move. Convenience methods for saving/viewing parse trees were moved from RuleContext (parse tree) and org.antlr.v4.runtime.tree.Trees toorg.antlr.v4.gui.Trees.
  

You can view all Issues fixed in 4.5.1, all pull requests merged and all commits for this release.
Features

• 　　Add goto to reserved words for java
  
• 　　Create functionality to get all possible parse trees for ambiguous input.
  
• 　　Makes TestRig's dialog to save and restore its state
  
• 　　Parser.setProfile() should keep settings like prediction mode
  
• 　　Make Grammar-object-aware ParserInterpreter (This interpreter will have parse tree nodes that know which alternative or label was matched for a particular parse tree subtree root.)
  
• 　　Check for nonconforming left-recursive rules.
  

Bug Fixes

• 　　Null pointer in named alternative with attributes
  
• 　　NullPointerException in bad recursion
  
• 　　Parser.setProfile() should keep settings like prediction mode
  
• 　　Allow parsing decision override for (decision, input index) in parsers
  
• 　　Random ArrayIndexOutOfBounds exceptions coming from ParserATNSimulator
  
• 　　Empty rule matched first gives invalid source interval
  
• 　　EOF leaf not included in parent tree source interval
  
• 　　Rule parameter in left recursive rules disallowed
  
• 　　wrong location on import error message reference to undefined rule
  
• 　　NotNull import is not deleted in Java.stg