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我即将将此PHP EBNF迁移到 ANTLR v4 格式。

不幸的是，ANTLR 中断了消息can't find rule grammarSpec or tree structure error：

can't find rule grammarSpec or tree structure error: 
(COMBINED_GRAMMAR Php (RULES (RULE start (BLOCK (ALT (top_statement_list 0)))) 
(RULE top_statement_list int _p (BLOCK (ALT (BLOCK (ALT {})) (* (BLOCK (ALT {2 >= 
...

java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.antlr.v4.parse.GrammarTreeVisitor.visit(GrammarTreeVisitor.java:206)
    at org.antlr.v4.parse.GrammarTreeVisitor.visitGrammar(GrammarTreeVisitor.java:200)
    at org.antlr.v4.semantics.SymbolCollector.process(SymbolCollector.java:76)
    at org.antlr.v4.semantics.SemanticPipeline.process(SemanticPipeline.java:103)
    at org.antlr.v4.Tool.processNonCombinedGrammar(Tool.java:399)
    at org.antlr.v4.Tool.process(Tool.java:384)
    at org.antlr.v4.Tool.processGrammarsOnCommandLine(Tool.java:343)
    at org.antlr.v4.Tool.main(Tool.java:190)
Caused by: java.lang.ArrayIndexOutOfBoundsException: 2
    at org.antlr.v4.semantics.SymbolCollector.discoverOuterAlt(SymbolCollector.java:111)
    at org.antlr.v4.parse.GrammarTreeVisitor.outerAlternative(GrammarTreeVisitor.java:2284)
    at org.antlr.v4.parse.GrammarTreeVisitor.ruleBlock(GrammarTreeVisitor.java:2197)
    at org.antlr.v4.parse.GrammarTreeVisitor.rule(GrammarTreeVisitor.java:1663)
    at org.antlr.v4.parse.GrammarTreeVisitor.rules(GrammarTreeVisitor.java:1241)
    at org.antlr.v4.parse.GrammarTreeVisitor.grammarSpec(GrammarTreeVisitor.java:480)
    ... 12 more
Exception in thread "main" java.lang.NullPointerException
    at org.antlr.v4.tool.LeftRecursiveRule.getAltLabels(LeftRecursiveRule.java:91)
    at org.antlr.v4.tool.Rule.hasAltSpecificContexts(Rule.java:200)
    at org.antlr.v4.tool.LeftRecursiveRule.hasAltSpecificContexts(LeftRecursiveRule.java:60)
    at org.antlr.v4.semantics.SymbolChecks.checkForLabelConflicts(SymbolChecks.java:150)
    at org.antlr.v4.semantics.SymbolChecks.process(SymbolChecks.java:98)
    at org.antlr.v4.semantics.SemanticPipeline.process(SemanticPipeline.java:107)
    at org.antlr.v4.Tool.processNonCombinedGrammar(Tool.java:399)
    at org.antlr.v4.Tool.process(Tool.java:384)
    at org.antlr.v4.Tool.processGrammarsOnCommandLine(Tool.java:343)
    at org.antlr.v4.Tool.main(Tool.java:190)

如果我减少规则的数量，问题就不会出现，但 ANTLR 抱怨缺少符号。

任何人都可以提供如何追踪错误的提示吗？看不到减少规则数量的替代方法。

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1 回答 1

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您的语法中出现以下情况之一（问题不包括在内）：

  1. 它包含一个语法错误，ANTLR 4 语法编译器无法从中恢复。

  2. 您在 ANTLR 4 语法编译器中发现了一个错误，应将其报告给项目问题跟踪器。

于 2013-09-17T22:42:26.903 回答