Class ATNSerializer

java.lang.Object
org.antlr.v4.runtime.atn.ATNSerializer

public class ATNSerializer extends Object
This class represents a target neutral serializer for ATNs. An ATN is converted to a list of integers that can be converted back to and ATN. We compute the list of integers and then generate an array into the target language for a particular lexer or parser. Java is a special case where we must generate strings instead of arrays, but that is handled outside of this class. See ATNDeserializer.encodeIntsWith16BitWords(IntegerList) and SerializedJavaATN.
  • Field Details

    • atn

      public ATN atn
    • data

      private final IntegerList data
    • sets

      private final Map<IntervalSet,Boolean> sets
      Note that we use a LinkedHashMap as a set to mainintain insertion order while deduplicating entries with the same key.
    • nonGreedyStates

      private final IntegerList nonGreedyStates
    • precedenceStates

      private final IntegerList precedenceStates
  • Constructor Details

    • ATNSerializer

      public ATNSerializer(ATN atn)
  • Method Details

    • serialize

      public IntegerList serialize()
      Serialize state descriptors, edge descriptors, and decision→state map into list of ints. Likely out of date, but keeping as it could be helpful: SERIALIZED_VERSION UUID (2 longs) grammar-type, (ANTLRParser.LEXER, ...) max token type, num states, state-0-type ruleIndex, state-1-type ruleIndex, ... state-i-type ruleIndex optional-arg ... num rules, rule-1-start-state rule-1-args, rule-2-start-state rule-2-args, ... (args are token type,actionIndex in lexer else 0,0) num modes, mode-0-start-state, mode-1-start-state, ... (parser has 0 modes) num unicode-bmp-sets bmp-set-0-interval-count intervals, bmp-set-1-interval-count intervals, ... num unicode-smp-sets smp-set-0-interval-count intervals, smp-set-1-interval-count intervals, ... num total edges, src, trg, edge-type, edge arg1, optional edge arg2 (present always), ... num decisions, decision-0-start-state, decision-1-start-state, ... Convenient to pack into unsigned shorts to make as Java string.
    • addPreamble

      private void addPreamble()
    • addLexerActions

      private void addLexerActions()
    • addDecisionStartStates

      private void addDecisionStartStates()
    • addEdges

      private void addEdges(int nedges, Map<IntervalSet,Integer> setIndices)
    • addSets

      private Map<IntervalSet,Integer> addSets()
    • addModeStartStates

      private void addModeStartStates()
    • addRuleStatesAndLexerTokenTypes

      private void addRuleStatesAndLexerTokenTypes()
    • addPrecedenceStates

      private void addPrecedenceStates()
    • addNonGreedyStates

      private void addNonGreedyStates()
    • addEdges

      private int addEdges()
    • serializeSets

      private static void serializeSets(IntegerList data, Collection<IntervalSet> sets)
    • getSerialized

      public static IntegerList getSerialized(ATN atn)