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ANTLR - ANother Tool for Language Recognition, version 4


antlr4 [options] file.g4 [ file2.g4 file3.g4 ...]


ANTLR (ANother Tool for Language Recognition) is a parser generator for reading,
processing, executing, or translating structured text or binary files. It's widely used to
build languages, tools, and frameworks. From a grammar, ANTLR generates a parser that can
build and walk parse trees.


-o outdir
Specify output directory where all output is generated.

ANTLR generates output files in the current directory by default. This option
specifies the output directory where ANTLR should generate parsers, listeners,
visitors, and tokens files.

-lib dir
Specify location of grammars, tokens files.

When looking for tokens files and imported grammars, ANTLR normally looks in the
current directory. This option specifies which directory to look in instead. It is
only used for resolving grammar references for the import statement and the
tokenVocab option. The path to the primary grammar must always be fully specified.

-atn Generate rule augmented transition network diagrams.

This option generates DOT graph files that represent the internal ATN (augmented
transition network) data structures that ANTLR uses to represent grammars. The
files come out as Grammar.rule .dot. If the grammar is a combined grammar, the
lexer rules are named Grammar Lexer.rule .dot.

-encoding encodingname
Specify grammar file encoding; e.g., euc-jp.

By default ANTLR loads grammar files using the UTF-8 encoding, which is a very
common character file encoding that degenerates to ASCII for characters that fit in
one byte. If that grammar file is not the default encoding for your locale, you
need this option so that ANTLR can properly interpret grammar files. This does not
affect the input to the generated parsers, just the encoding of the grammars

-message-format format
Specify output style for messages in antlr, gnu, vs2005.

ANTLR generates warning and error messages using templates from directory
tool/resources/org/antlr/v4/tool/templates/messages/formats. By default, ANTLR
uses the antlr.stg (StringTemplate group) file. You can change this to 'gnu' or
'vs2005' to have ANTLR generate messages appropriate for Emacs or Visual Studio. To
make your own called X, create resource
org/antlr/v4/tool/templates/messages/formats/X and place it in the CLASSPATH.

Show exception details when available for errors and warnings.

Generate parse tree listener (default).

Don't generate parse tree listener.

Generate parse tree visitor.

ANTLR can generate both parse tree listeners and visitors; this option and
-listener aren’t mutually exclusive.

Don't generate parse tree visitor (default).

-package packagename
Specify a package/namespace for the generated code.

Use this option to specify a package or namespace for ANTLR-generated files.
Alternatively, you can add a @header {...} action but that ties the grammar to a
specific language. If you use this option and @header, make sure that the header
action does not contain a package specification otherwise the generated code will
have two of them.

Generate file dependencies.

Instead of generating a parser and/or lexer, generate a list of file dependencies,
one per line. The output shows what each grammar depends on and what it generates.
This is useful for build tools that need to know ANTLR grammar dependencies.

If you use -lib libdir with -depend and grammar option tokenVocab=A, then the
dependencies include the library path as well.

-Xforce-atn use the ATN simulator for all predictions
-Xlog dump lots of logging info to antlr-timestamp.log

Set or override a grammar-level option.

This option is useful for generating parsers in different languages without
altering the grammar itself (with --Dlanguage=CSharp for example).

Treat warnings as errors.

As part of a large build, ANTLR warning messages could go unnoticed. Turn on this
option to have warnings treated as errors, causing the ANTLR tool to report failure
back to the invoking commandline shell.

Launch StringTemplate visualizer on generated code.

For those building a code generation target, this option brings up a window showing
the generated code and the templates used to generate that code. It invokes the
StringTemplate inspector window.

Wait for STViz to close before continuing.

Use the ATN simulator for all predictions.

ANTLR normally builds traditional “switch on token type” decisions where possible
(one token of lookahead is sufficient to distinguish between all alternatives in a
decision). To force even these simple decisions into the adaptive LL(*) mechanism,
use this option.

-Xlog Dump lots of logging info to antlr-timestamp.log.

This option creates a log file containing lots of information messages from ANTLR
as it processes your grammar. If you would like to see how ANTLR translates your
left-recursive rules, turn on this option and look in the resulting log file.

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