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grun.(bat|sh) is the command line script of testrig

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Syntax

grun

Warning: TestRig moved to org.antlr.v4.gui.TestRig; calling automatically
java org.antlr.v4.gui.TestRig GrammarName startRuleName
  [-tokens] [-tree] [-gui] [-ps file.ps] [-encoding encodingname]
  [-trace] [-diagnostics] [-SLL]
  [input-filename(s)]
Use startRuleName='tokens' if GrammarName is a lexer grammar.
Omitting input-filename makes rig read from stdin.

where:

• Antlr - Parse Tree (AST)
• grammarName is the name of the grammar file
• startRuleName is the name of the start rule for a parser grammar
• -tree prints the parse tree in LISP notation.
• -tokens to show the tokens detected,
• -gui to generate an image of the syntax tree