CODEWITHSUNDEEP
compiler-constructiongrammarcompiler-optimizationlexerjavacc
ps_messenger
ps_messenger

Reputation: 111

Best way to define tokens

I'm trying to optimize my javacc parser and I have a question about defining tokens in the grammar definition.

Is it good or bad practice? Does it affect much the performance of the parser.

example: 

void name() :
{
  Token name;
}
{
  name = < NAME : ( < LETTER > | < DIGIT > ){2, 7}>
  {
    System.out.println(name.image);
  }
}

Upvotes: 1

Views: 75

Answers (1)

Theodore Norvell
Theodore Norvell

Reputation: 16221

It won't affect performance, but it will affect readability and maintainability. Keep in mind that the order of token definitions can make a difference to the meaning. I suggest putting all token definitions up front.

Upvotes: 2

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