Antlr4 demo for Clojure

• Textbook: The Definitive ANTLR 4 Reference, 2nd Edition, Pragmatic Bookshelf, 2013

1. Setting up antlr4

• https://www.antlr.org/

$ cd /usr/local/lib
$ sudo curl -O https://www.antlr.org/download/antlr-4.7.2-complete.jar

$ export CLASSPATH=".:/usr/local/lib/antlr-4.7.2-complete.jar:$CLASSPATH"
$ alias antlr4='java -jar /usr/local/lib/antlr-4.7.2-complete.jar'
$ alias grun='java org.antlr.v4.gui.TestRig'

2. Running examples

$ lein run <grammar> <arg>*

2.1. Examples

• input file example

  $ lein run labeled-expr data/t.expr
  193
  17
  9

• STDIN example

  $ lein run labeled-expr
  (2+3)*4 <Enter>
  <Ctrl-D or Ctrl-Z>
  20

2.2. Detailed examples

• expr (4.1 Matching an Arithmetic Expression Language)

  Generating lexers and parsers

  # in src/java/grammar/expr folder
  $ antlr4 -package grammar.expr Expr.g4

  Running an example

  $ lein run expr data/t.expr

• labeled-expr (4.2 Building a Calculator Using a Visitor)

  Generating lexers and parsers

  # in src/java/grammar/labeledexpr folder
  $ antlr4 -package grammar.labeledexpr -no-listener -visitor LabeledExpr.g4

  Running an example

  $ lein run labeled-expr data/t.expr

• java (4.3 Building a Translator with a Listener)

  Generating lexers and parsers

  # in src/java/grammar/java folder
  $ antlr4 -package grammar.java Java.g4

  Running an example

  $ lein run java data/Demo.java

• rows (4.4 Making Things Happen During the Parse)

  Generating lexers and parsers

  # in src/java/grammar/rows folder
  $ antlr4 -package grammar.rows -no-listener Rows.g4

  Running an example

  $ lein run rows data/t.rows

• serial-id (4.5 Cool Lexical Features)

  Generating lexers and parsers

  # in src/java/grammar/java folder
  $ antlr4 -package grammar.java Java.g4

  Running an example

  $ lein run serial-id data/Demo.java

3. License

Distributed under the Eclipse Public License either version 1.0 or any later version.