compromise/src/terms/tagger/steps/10-negation_step.js

natural language processing in the browser

'use strict';
const log = require('../paths').log;
const path = 'tagger/negation';

// 'not' is sometimes a verb, sometimes an adjective
const negation_step = function(ts) {
  log.here(path);
  for(let i = 0; i < ts.length; i++) {
    let t = ts.get(i);
    if (t.normal === 'not' || t.silent_term === 'not') {
      //find the next verb/adjective
      for(let o = i + 1; o < ts.length; o++) {
        if (ts.get(o).tag.Verb) {
          t.tagAs('VerbPhrase', 'negate-verb');
          break;
        }
        if (ts.get(o).tag.Adjective) {
          t.tagAs('AdjectivePhrase', 'negate-adj');
          break;
        }
      }
    }
  }
  return ts;
};

module.exports = negation_step;