rocambole-whitespace

helpers for rocambole AST whitespace manipulation

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rocambole-whitespace
Helpers to manipulate rocambole WhiteSpace tokens.
Used mainly by esformatter and its plugins.

API

var ws = require('rocambole-whitespace');

setOptions(opts)

setOptions is just a way to store some constants so later on the limit/limitBefore/limitAfter you can reference the values by Id.
setOptions({
  // sets "value" used by `WhiteSpace` tokens (defaults to single space)
  value: ' ',

  // values inside "before" are used by `limitBefore`
  before: {
    // setting to `0` will remove all spaces before the token
    parenthesis: 0
  },

  // values inside "after" are used by `limitAfter`
  after: {
    // setting to `1` will add/keep a single `WhiteSpace` after the token
    parenthesis: 1
  }
});

Important: calling this method will override all the options.

limitBefore(token, typeOrValue)

limits the amount of WhiteSpace before a given token.
// remove all white spaces before `node.startToken`
limitBefore(node.startToken, 0);
// add/keep 2 white spaces before `node.startToken`
limitBefore(node.startToken, 2);
// will use value stored on `setOptions` for `before.parenthesis`
limitBefore(node.startToken, 'parenthesis');
// values smaller than zero are ignored (this won't change anything)
limitBefore(node.startToken, -1);

limitAfter(token, typeOrValue)

limits the amount of WhiteSpace after a given token.
// remove all white spaces after `node.startToken`
limitAfter(node.startToken, 0);
// add/keep 1 white space after `node.startToken`
limitAfter(node.startToken, 1);
// will use value stored on `setOptions` for `after.parenthesis`
limitAfter(node.startToken, 'parenthesis');
// values smaller than zero are ignored (this won't change anything)
limitAfter(node.startToken, -1);

limit(token, typeOrvalue)

limits the amount of WhiteSpace around a given token.
// add/keep 1 white space before and after `node.startToken`
limit(node.startToken, 1);

// it's just an alias to
limitBefore(node.startToken, 1);
limitAfter(node.startToken, 1);

expectedBefore(type)

reads value stored during setOptions for a given type, or returns -1 if not found.
assert( expectedBefore('parenthesis') === 0 );

expectedAfter(type)

reads value stored during setOptions for a given type, or returns -1 if not found.
assert( expectedAfter('parenthesis') === 1 );

Debug

This module uses debug internally. To make it easier to identify what is wrong we sometimes run the esformatter tests with a DEBUG flag, like:
DEBUG=rocambole:ws:* npm test

License

Released under the MIT License