TokenSource class abstract

A source of tokens must provide a sequence of tokens via {@link #nextToken()} and also must reveal it's source of characters; CommonToken's text is computed from a CharStream; it only store indices into the char stream.

Errors from the lexer are never passed to the parser. Either you want to keep going or you do not upon token recognition error. If you do not want to continue lexing then you do not want to continue parsing. Just throw an exception not under [RecognitionException] and Java will naturally toss you all the way out of the recognizers. If you want to continue lexing then you should not throw an exception to the parser--it has already requested a token. Keep lexing until you get a valid one. Just report errors and keep going, looking for a valid token.

Implementers

Constructors

TokenSource()

Properties

charPositionInLine → int
Get the index into the current line for the current position in the input stream. The first character on a line has position 0.
no setter
hashCode → int
The hash code for this object.
no setterinherited
inputStream → CharStream?
Get the CharStream from which this token source is currently providing tokens.
no setter
line → int?
Get the line number for the current position in the input stream. The first line in the input is line 1.
no setter
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
sourceName → String
Gets the name of the underlying input source. This method returns a non-null, non-empty string. If such a name is not known, this method returns {@link IntStream#UNKNOWN_SOURCE_NAME}.
no setter
tokenFactory ↔ TokenFactory<Token>
Gets the TokenFactory this token source is currently using for creating Token objects from the input.
getter/setter pair

Methods

nextToken() → Token
Return a Token object from your input stream (usually a CharStream). Do not fail/return upon lexing error; keep chewing on the characters until you get a good one; errors are not passed through to the parser.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited