类 ParseTreeBuilder
- java.lang.Object
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- org.antlr.runtime.debug.BlankDebugEventListener
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- org.antlr.runtime.debug.ParseTreeBuilder
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- 所有已实现的接口:
DebugEventListener
public class ParseTreeBuilder extends BlankDebugEventListener
This parser listener tracks rule entry/exit and token matches to build a simple parse tree using ParseTree nodes.
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字段概要
字段 修饰符和类型 字段 说明 static java.lang.String
EPSILON_PAYLOAD
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从接口继承的字段 org.antlr.runtime.debug.DebugEventListener
FALSE, PROTOCOL_VERSION, TRUE
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构造器概要
构造器 构造器 说明 ParseTreeBuilder(java.lang.String grammarName)
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方法概要
所有方法 实例方法 具体方法 修饰符和类型 方法 说明 void
consumeHiddenToken(Token token)
An off-channel input token was consumed.void
consumeToken(Token token)
An input token was consumed; matched by any kind of element.ParseTree
create(java.lang.Object payload)
What kind of node to create.void
enterDecision(int d, boolean couldBacktrack)
Backtracking or cyclic DFA, don't want to add nodes to treevoid
enterRule(java.lang.String filename, java.lang.String ruleName)
The parser has just entered a rule.ParseTree
epsilonNode()
void
exitDecision(int i)
void
exitRule(java.lang.String filename, java.lang.String ruleName)
This is the last thing executed before leaving a rule.ParseTree
getTree()
void
recognitionException(RecognitionException e)
A recognition exception occurred such as NoViableAltException.-
从类继承的方法 org.antlr.runtime.debug.BlankDebugEventListener
addChild, becomeRoot, beginBacktrack, beginResync, commence, consumeNode, createNode, createNode, endBacktrack, endResync, enterAlt, enterSubRule, errorNode, exitSubRule, location, LT, LT, mark, nilNode, rewind, rewind, semanticPredicate, setTokenBoundaries, terminate
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字段详细资料
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EPSILON_PAYLOAD
public static final java.lang.String EPSILON_PAYLOAD
- 另请参阅:
- 常量字段值
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方法详细资料
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getTree
public ParseTree getTree()
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create
public ParseTree create(java.lang.Object payload)
What kind of node to create. You might want to override so I factored out creation here.
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epsilonNode
public ParseTree epsilonNode()
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enterDecision
public void enterDecision(int d, boolean couldBacktrack)
Backtracking or cyclic DFA, don't want to add nodes to tree- 指定者:
enterDecision
在接口中DebugEventListener
- 覆盖:
enterDecision
在类中BlankDebugEventListener
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exitDecision
public void exitDecision(int i)
- 指定者:
exitDecision
在接口中DebugEventListener
- 覆盖:
exitDecision
在类中BlankDebugEventListener
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enterRule
public void enterRule(java.lang.String filename, java.lang.String ruleName)
从接口复制的说明:DebugEventListener
The parser has just entered a rule. No decision has been made about which alt is predicted. This is fired AFTER init actions have been executed. Attributes are defined and available etc... The grammarFileName allows composite grammars to jump around among multiple grammar files.- 指定者:
enterRule
在接口中DebugEventListener
- 覆盖:
enterRule
在类中BlankDebugEventListener
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exitRule
public void exitRule(java.lang.String filename, java.lang.String ruleName)
从接口复制的说明:DebugEventListener
This is the last thing executed before leaving a rule. It is executed even if an exception is thrown. This is triggered after error reporting and recovery have occurred (unless the exception is not caught in this rule). This implies an "exitAlt" event. The grammarFileName allows composite grammars to jump around among multiple grammar files.- 指定者:
exitRule
在接口中DebugEventListener
- 覆盖:
exitRule
在类中BlankDebugEventListener
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consumeToken
public void consumeToken(Token token)
从接口复制的说明:DebugEventListener
An input token was consumed; matched by any kind of element. Trigger after the token was matched by things like match(), matchAny().- 指定者:
consumeToken
在接口中DebugEventListener
- 覆盖:
consumeToken
在类中BlankDebugEventListener
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consumeHiddenToken
public void consumeHiddenToken(Token token)
从接口复制的说明:DebugEventListener
An off-channel input token was consumed. Trigger after the token was matched by things like match(), matchAny(). (unless of course the hidden token is first stuff in the input stream).- 指定者:
consumeHiddenToken
在接口中DebugEventListener
- 覆盖:
consumeHiddenToken
在类中BlankDebugEventListener
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recognitionException
public void recognitionException(RecognitionException e)
从接口复制的说明:DebugEventListener
A recognition exception occurred such as NoViableAltException. I made this a generic event so that I can alter the exception hierachy later without having to alter all the debug objects. Upon error, the stack of enter rule/subrule must be properly unwound. If no viable alt occurs it is within an enter/exit decision, which also must be rewound. Even the rewind for each mark must be unwount. In the Java target this is pretty easy using try/finally, if a bit ugly in the generated code. The rewind is generated in DFA.predict() actually so no code needs to be generated for that. For languages w/o this "finally" feature (C++?), the target implementor will have to build an event stack or something. Across a socket for remote debugging, only the RecognitionException data fields are transmitted. The token object or whatever that caused the problem was the last object referenced by LT. The immediately preceding LT event should hold the unexpected Token or char. Here is a sample event trace for grammar: b : C ({;}A|B) // {;} is there to prevent A|B becoming a set | D ; The sequence for this rule (with no viable alt in the subrule) for input 'c c' (there are 3 tokens) is: commence LT(1) enterRule b location 7 1 enter decision 3 LT(1) exit decision 3 enterAlt1 location 7 5 LT(1) consumeToken [c/<4>,1:0] location 7 7 enterSubRule 2 enter decision 2 LT(1) LT(1) recognitionException NoViableAltException 2 1 2 exit decision 2 exitSubRule 2 beginResync LT(1) consumeToken [c/<4>,1:1] LT(1) endResync LT(-1) exitRule b terminate- 指定者:
recognitionException
在接口中DebugEventListener
- 覆盖:
recognitionException
在类中BlankDebugEventListener
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