CODEWITHSUNDEEP
javaantantlr4
Aage Torleif
Aage Torleif

Reputation: 2013

How to make ant put a package directive in several source files?

I'm using Antlr4 to build a parser and I'm using Netbeans as an IDE and ant as a build system. Ant runs Antlr which generates a parser.java and lexer.java in the project's src/ directory.

They both need a package directive, and so I have to add it by hand.

Is there a way to prepend a line of text to all source files in a directory with Ant? Or are there any other solutions to this? (Maybe with Antlr?)

Upvotes: 0

Views: 195

Answers (2)

Aage Torleif
Aage Torleif

Reputation: 2013

There's an odd caveat where @header {...} in a grammar for a combined lexer+parser works. However for separate lexer and parser grammar files each has to have the header declared as 

@lexer::header { ... }
// or 
@parser::header { ... }

or else only the parser will have a header added (that is the caveat).

Also, as mentioned by Vincent there is a command line option, but that same caveat applies.

Upvotes: 0

Vincent Aranega
Vincent Aranega

Reputation: 1536

You can use a combinaison of the -o option for antlr4 command line and @header{...} in your grammar:

  • -o allows you to specify the output directory where all output will be generated,

  • @header{...} will insert the code you write into {..} as your generated code header so you can put your package declaration into this block.

for example:

grammar myGrammar;

@header {
    package my.package;
}
...

If you don't want to tie your grammar to a specific language, you can use the -package option (allows you to specify a package or namespace for the generated files) and remove the package declaration from your @header{...} code.

Upvotes: 1

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