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class Antlr < Formula
homepage "http://www.antlr.org/"
url "http://www.antlr.org/download/antlr-4.5-complete.jar"
sha1 "d73369e018ca99c6d9ec609473395b8257d783d3"
def install
prefix.install "antlr-#{version}-complete.jar"
bin.write_jar_script prefix/"antlr-#{version}-complete.jar", "antlr4"
(bin+"grun").write <<-EOS.undent
#!/bin/bash
java -classpath #{prefix}/antlr-#{version}-complete.jar:. org.antlr.v4.runtime.misc.TestRig "$@"
EOS
end
test do
path = testpath/"Expr.g4"
path.write <<-EOS.undent
grammar Expr;
prog:\t(expr NEWLINE)* ;
expr:\texpr ('*'|'/') expr
|\texpr ('+'|'-') expr
|\tINT
|\t'(' expr ')'
;
NEWLINE :\t[\\r\\n]+ ;
INT :\t[0-9]+ ;
EOS
ENV.prepend "CLASSPATH", "#{prefix}/antlr-#{version}-complete.jar", ":"
ENV.prepend "CLASSPATH", ".", ":"
system "#{bin}/antlr4", "Expr.g4"
system "javac", *Dir["Expr*.java"]
assert_match(/^$/, pipe_output("#{bin}/grun Expr prog", "22+20\n"))
end
end
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