Package org.apache.groovy.parser.antlr4

Class AbstractLexer

java.lang.Object
org.antlr.v4.runtime.Recognizer<Integer,org.antlr.v4.runtime.atn.LexerATNSimulator>
org.antlr.v4.runtime.Lexer
org.apache.groovy.parser.antlr4.AbstractLexer
All Implemented Interfaces:
org.antlr.v4.runtime.TokenSource, SyntaxErrorReportable
Direct Known Subclasses:
GroovyLexer
public abstract class AbstractLexer extends org.antlr.v4.runtime.Lexer implements SyntaxErrorReportable
Because antlr4 does not support generating lexer with specified interface, we have to create a super class for it and implement the interface.

Lexer-error-path helpers used from GroovyLexer.g4 actions also live here so the grammar stays thin. Successful tokenisation never calls them. Character display for diagnostics goes through getCharErrorDisplay(int) so GString dollar errors and UNEXPECTED_CHAR share one escape policy.

  • Field Summary

    Fields inherited from class org.antlr.v4.runtime.Lexer

    _channel, _factory, _hitEOF, _input, _mode, _modeStack, _text, _token, _tokenFactorySourcePair, _tokenStartCharIndex, _tokenStartCharPositionInLine, _tokenStartLine, _type, DEFAULT_MODE, DEFAULT_TOKEN_CHANNEL, HIDDEN, MAX_CHAR_VALUE, MIN_CHAR_VALUE, MORE, SKIP

    Fields inherited from class org.antlr.v4.runtime.Recognizer

    _interp, EOF

    Fields inherited from interface org.apache.groovy.parser.antlr4.SyntaxErrorReportable

    NO_OFFSET

  • Constructor Summary

    Constructors
    Constructor
    Description
    AbstractLexer(org.antlr.v4.runtime.CharStream input)
     

  • Method Summary

    Modifier and Type
    Method
    Description
    String
    getCharErrorDisplay(int c)
    Quoted diagnostic form of a code point.

    Methods inherited from class org.antlr.v4.runtime.Lexer

    emit, emit, emitEOF, getAllTokens, getChannel, getChannelNames, getCharIndex, getCharPositionInLine, getErrorDisplay, getErrorDisplay, getInputStream, getLine, getModeNames, getSourceName, getText, getToken, getTokenFactory, getTokenNames, getType, mode, more, nextToken, notifyListeners, popMode, pushMode, recover, recover, reset, setChannel, setCharPositionInLine, setInputStream, setLine, setText, setToken, setTokenFactory, setType, skip, validateInputStream

    Methods inherited from class org.antlr.v4.runtime.Recognizer

    action, addErrorListener, getATN, getErrorHeader, getErrorListenerDispatch, getErrorListeners, getGrammarFileName, getInterpreter, getParseInfo, getRuleIndexMap, getRuleNames, getSerializedATN, getState, getTokenErrorDisplay, getTokenType, getTokenTypeMap, getVocabulary, precpred, removeErrorListener, removeErrorListeners, sempred, setInterpreter, setState

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    Methods inherited from interface org.apache.groovy.parser.antlr4.SyntaxErrorReportable

    genPositionInfo, genPositionInfo, getErrorColumn, getErrorLine, getSyntaxErrorSource, require, require, require, require, require, require, throwSyntaxError, throwSyntaxError

  • Constructor Details

    • AbstractLexer

      public AbstractLexer(org.antlr.v4.runtime.CharStream input)

  • Method Details

    • getCharErrorDisplay

      public String getCharErrorDisplay(int c)
      Quoted diagnostic form of a code point. Overrides ANTLR's UTF-16 (char) truncation and limited escapes so both unexpected-character and GString-dollar messages can name invisible code points.
      Overrides:
      getCharErrorDisplay in class org.antlr.v4.runtime.Lexer