handlebars.js/spec/whitespace-control.js

describe('whitespace control', function() {
  it('should strip whitespace around mustache calls', function() {
    var hash = { foo: 'bar<' };

    shouldCompileTo(' {{~foo~}} ', hash, 'bar&lt;');
    shouldCompileTo(' {{~foo}} ', hash, 'bar&lt; ');
    shouldCompileTo(' {{foo~}} ', hash, ' bar&lt;');

    shouldCompileTo(' {{~&foo~}} ', hash, 'bar<');
    shouldCompileTo(' {{~{foo}~}} ', hash, 'bar<');

    shouldCompileTo('1\n{{foo~}} \n\n 23\n{{bar}}4', {}, '1\n23\n4');
  });

  describe('blocks', function() {
    it('should strip whitespace around simple block calls', function() {
      var hash = { foo: 'bar<' };

      shouldCompileTo(' {{~#if foo~}} bar {{~/if~}} ', hash, 'bar');
      shouldCompileTo(' {{#if foo~}} bar {{/if~}} ', hash, ' bar ');
      shouldCompileTo(' {{~#if foo}} bar {{~/if}} ', hash, ' bar ');
      shouldCompileTo(' {{#if foo}} bar {{/if}} ', hash, '  bar  ');

      shouldCompileTo(
        ' \n\n{{~#if foo~}} \n\nbar \n\n{{~/if~}}\n\n ',
        hash,
        'bar'
      );
      shouldCompileTo(
        ' a\n\n{{~#if foo~}} \n\nbar \n\n{{~/if~}}\n\na ',
        hash,
        ' abara '
      );
    });
    it('should strip whitespace around inverse block calls', function() {
      var hash = {};

      shouldCompileTo(' {{~^if foo~}} bar {{~/if~}} ', hash, 'bar');
      shouldCompileTo(' {{^if foo~}} bar {{/if~}} ', hash, ' bar ');
      shouldCompileTo(' {{~^if foo}} bar {{~/if}} ', hash, ' bar ');
      shouldCompileTo(' {{^if foo}} bar {{/if}} ', hash, '  bar  ');

      shouldCompileTo(
        ' \n\n{{~^if foo~}} \n\nbar \n\n{{~/if~}}\n\n ',
        hash,
        'bar'
      );
    });
    it('should strip whitespace around complex block calls', function() {
      var hash = { foo: 'bar<' };

      shouldCompileTo('{{#if foo~}} bar {{~^~}} baz {{~/if}}', hash, 'bar');
      shouldCompileTo('{{#if foo~}} bar {{^~}} baz {{/if}}', hash, 'bar ');
      shouldCompileTo('{{#if foo}} bar {{~^~}} baz {{~/if}}', hash, ' bar');
      shouldCompileTo('{{#if foo}} bar {{^~}} baz {{/if}}', hash, ' bar ');

      shouldCompileTo('{{#if foo~}} bar {{~else~}} baz {{~/if}}', hash, 'bar');

      shouldCompileTo(
        '\n\n{{~#if foo~}} \n\nbar \n\n{{~^~}} \n\nbaz \n\n{{~/if~}}\n\n',
        hash,
        'bar'
      );
      shouldCompileTo(
        '\n\n{{~#if foo~}} \n\n{{{foo}}} \n\n{{~^~}} \n\nbaz \n\n{{~/if~}}\n\n',
        hash,
        'bar<'
      );

      hash = {};

      shouldCompileTo('{{#if foo~}} bar {{~^~}} baz {{~/if}}', hash, 'baz');
      shouldCompileTo('{{#if foo}} bar {{~^~}} baz {{/if}}', hash, 'baz ');
      shouldCompileTo('{{#if foo~}} bar {{~^}} baz {{~/if}}', hash, ' baz');
      shouldCompileTo('{{#if foo~}} bar {{~^}} baz {{/if}}', hash, ' baz ');

      shouldCompileTo('{{#if foo~}} bar {{~else~}} baz {{~/if}}', hash, 'baz');

      shouldCompileTo(
        '\n\n{{~#if foo~}} \n\nbar \n\n{{~^~}} \n\nbaz \n\n{{~/if~}}\n\n',
        hash,
        'baz'
      );
    });
  });

  it('should strip whitespace around partials', function() {
    shouldCompileToWithPartials(
      'foo {{~> dude~}} ',
      [{}, {}, { dude: 'bar' }],
      true,
      'foobar'
    );
    shouldCompileToWithPartials(
      'foo {{> dude~}} ',
      [{}, {}, { dude: 'bar' }],
      true,
      'foo bar'
    );
    shouldCompileToWithPartials(
      'foo {{> dude}} ',
      [{}, {}, { dude: 'bar' }],
      true,
      'foo bar '
    );

    shouldCompileToWithPartials(
      'foo\n {{~> dude}} ',
      [{}, {}, { dude: 'bar' }],
      true,
      'foobar'
    );
    shouldCompileToWithPartials(
      'foo\n {{> dude}} ',
      [{}, {}, { dude: 'bar' }],
      true,
      'foo\n bar'
    );
  });

  it('should only strip whitespace once', function() {
    var hash = { foo: 'bar' };

    shouldCompileTo(' {{~foo~}} {{foo}} {{foo}} ', hash, 'barbar bar ');
  });
});