ConditionalTokenFilter

Applies a token filter conditionally based on a predicate function.

Import

import ConditionalTokenFilter from 'dynamosearch/filters/ConditionalTokenFilter';

Constructor

new ConditionalTokenFilter(options: {
  filter: TokenFilter;
  condition: (token: Token) => boolean;
})

Parameters

• filter (TokenFilter) - The filter to apply conditionally
• condition ((token: Token) => boolean) - Predicate function to determine if filter should be applied

Example

import LowerCaseFilter from 'dynamosearch/filters/LowerCaseFilter';

const filter = new ConditionalTokenFilter({
  filter: new LowerCaseFilter(),
  condition: (token) => token.token.length > 3,
});

const tokens = filter.apply([
  { token: 'HELLO', startOffset: 0, endOffset: 5, position: 0 }, // length > 3, lowercased
  { token: 'HI', startOffset: 6, endOffset: 8, position: 1 },    // length <= 3, unchanged
]);
// [
//   { token: 'hello', startOffset: 0, endOffset: 5, position: 0 },
//   { token: 'HI', startOffset: 6, endOffset: 8, position: 1 }
// ]

Best For

• Conditional token processing
• Complex filtering logic
• Applying filters selectively

See Also

• TokenFilter - Base class for filters