All files / lib/ner ner-manager.js

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/*
 * Copyright (c) AXA Group Operations Spain S.A.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 
const Recognizers = require('@microsoft/recognizers-text-suite');
const { SimilarSearch } = require('../util');
const NlpUtil = require('../nlp/nlp-util');
const EnumNamedEntity = require('./enum-named-entity');
const RegexNamedEntity = require('./regex-named-entity');
const TrimNamedEntity = require('./trim-named-entity');
const BuiltinDictionary = require('./builtin-dictionary.json');
const BuiltinInverse = require('./builtin-inverse.json');
const { TrimTypesList } = require('./constants');
 
/**
 * Class for a named entities manager, that can be recognized inside
 * a string.
 * Basically, a named entity is an enumerator that has a set of options,
 * and each option can have several words to refer to this option.
 * Example:
 * We have the entity "Superhero". Inside "Superhero" we have different
 * options:
 * - Superman: Superman
 * - Spiderman: Spiderman, Spider-man
 * - Wolverine: Wolverine, Logan, Patch, Weapon X
 */
class NerManager {
  /**
   * Constructor of the class.
   * @param {Object} settings Settings for initializing this instance.
   */
  constructor(settings) {
    this.settings = settings || {};
    this.threshold = this.settings.threshold || 0.8;
    this.namedEntities = {};
    this.similar = new SimilarSearch({ normalize: true });
    this.builtins = this.settings.builtins || [
      'Number',
      'Ordinal',
      'Percentage',
      'Age',
      'Currency',
      'Dimension',
      'Temperature',
      'DateTime',
      'PhoneNumber',
      'IpAddress',
      'Boolean',
      'Email',
      'Hashtag',
      'URL',
    ];
    let list = this.settings.builtinWhitelist || [
      'age',
      'currency',
      'dimension',
      'temperature',
      'number',
      'numberrange',
      'ordinal',
      'percentage',
      'email',
      'hashtag',
      'ip',
      'mention',
      'phonenumber',
      'url',
      'date',
      'daterange',
      'datetime',
      'datetimealt',
      'time',
      'set',
      'timerange',
      'timezone',
      'boolean',
      'duration',
    ];
    this.builtinWhitelist = {};
    for (let i = 0; i < list.length; i += 1) {
      this.builtinWhitelist[list[i]] = true;
    }
    list = this.settings.builtinBlacklist || [];
    for (let i = 0; i < list.length; i += 1) {
      delete this.builtinWhitelist[list[i]];
    }
  }
 
  /**
   * Given a resolution unit in source language, translate into default language.
   * @param {string} str Resolution unit in source language.
   * @param {string} locale Source language locale.
   * @returns {string} Translation or source resolution unit.
   */
  translate(str, locale) {
    if (BuiltinDictionary[locale]) {
      const translation = BuiltinDictionary[locale][str];
      return translation !== '' ? translation : str;
    }
    return str;
  }
 
  /**
   * Given a resolution unit in default language, translate into source language.
   * @param {string} str Resolution unit in default language.
   * @param {string} locale Source language locale.
   * @returns {string} Translation or default resolution unit.
   */
  inverseTranslate(str, locale) {
    if (BuiltinInverse[locale]) {
      const translation = BuiltinInverse[locale][str];
      if (translation && translation.length > 0) {
        return translation[0];
      }
    }
    return str;
  }
 
  /**
   * Creates a new instance of a named entity.
   * @param {string} entityName Name of the entity
   * @param {string} type Type of the entity
   * @returns {NamedEntity} New named entity.
   */
  newNamedEntity(entityName, type = 'enum') {
    const options = { name: entityName };
    switch (type.toLowerCase()) {
      case 'regex':
        return new RegexNamedEntity(options);
      case 'trim':
        return new TrimNamedEntity(options);
      default:
        return new EnumNamedEntity(options);
    }
  }
 
  /**
   * Adds a new entity to be managed by the NER. If the entity already exists,
   * then returns the already existing one.
   * @param {String} entityName Name of the entity.
   * @param {String} type Type of the entity.
   * @returns {Object} Already existing entity or the new one created.
   */
  addNamedEntity(entityName, type) {
    if (this.namedEntities[entityName]) {
      return this.namedEntities[entityName];
    }
    const entity = this.newNamedEntity(entityName, type);
    this.namedEntities[entityName] = entity;
    return entity;
  }
 
  /**
   * Get an entity given its name. If the entity does not exists and the
   * force flag is on, then creates the entity.
   * @param {String} entityName Name of the entity.
   * @param {boolean} force Flag to create the entity when it does not exists.
   * @returns {Object} The entity, or undefined if not found and not forced.
   */
  getNamedEntity(entityName, force = false) {
    return force
      ? this.addNamedEntity(entityName)
      : this.namedEntities[entityName];
  }
 
  /**
   * Removes an entity from the NER.
   * @param {String} entityName Name of the entity.
   */
  removeNamedEntity(entityName) {
    delete this.namedEntities[entityName];
  }
 
  /**
   * Add texts to the given languages of an option of an entity.
   * @param {String} entityName Name of the entity.
   * @param {String} optionName Name of the option.
   * @param {String[]} srcLanguages Language or languages for adding the texts.
   * @param {String[]} srcTexts Text or texts to be added.
   */
  addNamedEntityText(entityName, optionName, srcLanguages, srcTexts) {
    const entity = this.getNamedEntity(entityName, true);
    entity.addText(optionName, srcLanguages, srcTexts);
  }
 
  /**
   * Remove texts for the given languages of the option of an entity.
   * @param {String} entityName Name of the entity.
   * @param {String} optionName Name of the option.
   * @param {String[]} srcLanguages Languages affected.
   * @param {String[]} srcTexts Texts to be removed.
   */
  removeNamedEntityText(entityName, optionName, srcLanguages, srcTexts) {
    const entity = this.getNamedEntity(entityName);
    if (entity) {
      entity.removeText(optionName, srcLanguages, srcTexts);
    }
  }
 
  /**
   * Given an utterance, search for %entity% format inside it, in order to
   * return the list of entities referenced by the utterance.
   * @param {String} utterance Utterance for searching.
   * @returns {String[]} List of entities.
   */
  getEntitiesFromUtterance(utterance) {
    const entityKeys = Object.keys(this.namedEntities);
    const regex = new RegExp(`%((${entityKeys.join('|')})(?:_\\d+)?)%`, 'gm');
    const match = utterance.match(regex);
    return match ? match.map(item => item.replace(/%/g, '')) : [];
  }
 
  /**
   * Given an entity and a locale, calculate the resolution.
   * @param {Object} entity Entity instance with resolution.
   * @param {string} locale Entity language locale.
   * @returns {Object} Calculated resolution for the entity.
   */
  calculateResolution(entity, locale) {
    const { resolution } = entity;
    if (['number', 'ordinal', 'percentage'].includes(entity.typeName)) {
      let resValue = resolution.value;
      Eif (resValue) {
        resValue = resValue.replace(',', '.');
      }
      const value = Number.parseFloat(resValue);
      return {
        strValue: resValue,
        value,
        subtype: value % 1 === 0 ? 'integer' : 'float',
      };
    }
    if (
      entity.typeName === 'datetimeV2.date' ||
      entity.typeName === 'datetimeV2.daterange'
    ) {
      Eif (resolution.values) {
        if (resolution.values.length === 1) {
          const resValue = resolution.values[0];
          const result = {
            type: resValue.type,
            timex: resValue.timex,
          };
          if (resValue.value) {
            result.strValue = resValue.value;
            result.date = new Date(resValue.value);
          }
          return result;
        }
        Eif (resolution.values.length === 2) {
          const result = {
            type: 'interval',
            timex: resolution.values[0].timex,
          };
          if (resolution.values[0].value) {
            result.strPastValue = resolution.values[0].value;
            result.pastDate = new Date(result.strPastValue);
          }
          if (resolution.values[0].start) {
            result.strPastStartValue = resolution.values[0].start;
            result.pastStartDate = new Date(result.strPastStartValue);
          }
          if (resolution.values[0].end) {
            result.strPastEndValue = resolution.values[0].end;
            result.pastEndDate = new Date(result.strPastEndValue);
          }
          if (resolution.values[1].value) {
            result.strFutureValue = resolution.values[1].value;
            result.futureDate = new Date(result.strFutureValue);
          }
          if (resolution.values[1].start) {
            result.strFutureStartValue = resolution.values[1].start;
            result.futureStartDate = new Date(result.strFutureStartValue);
          }
          if (resolution.values[1].end) {
            result.strFutureEndValue = resolution.values[1].end;
            result.futureEndDate = new Date(result.strFutureEndValue);
          }
          return result;
        }
      }
    }
    if (!resolution) {
      return undefined;
    }
    if (resolution.unit) {
      const srcUnit = resolution.unit;
      resolution.srcUnit = srcUnit;
      resolution.unit = this.translate(srcUnit, locale);
      if (resolution.srcUnit === resolution.unit) {
        resolution.srcUnit = this.inverseTranslate(resolution.srcUnit, locale);
      }
    }
    if (resolution.srcUnit) {
      return {
        strValue: resolution.value,
        value: Number.parseFloat(resolution.value),
        unit: resolution.unit,
        localeUnit: resolution.srcUnit,
      };
    }
    return resolution;
  }
 
  /**
   * Given an array of edges, detect the trim edges and find overlaps with
   * non trim edges. When an overlap is detected, reduce the trim edged to
   * fit with the other edge.
   * @param {Object[]} edges Edges to be splited
   * @returns {Object[]} Splited edges.
   */
  splitEdges(edges) {
    for (let i = 0, l = edges.length; i < l; i += 1) {
      const edge = edges[i];
      if (TrimTypesList.includes(edge.type)) {
        for (let j = 0; j < edges.length; j += 1) {
          const other = edges[j];
          if (
            i !== j &&
            other.start >= edge.start &&
            other.end <= edge.end &&
            !TrimTypesList.includes(other.type)
          ) {
            const edgeLen = edge.end - edge.start;
            const otherLen = other.end - other.start;
            Eif (other.start - edge.start > edge.end - other.end) {
              // is at the beginning
              const text = edge.sourceText.substring(0, edgeLen - otherLen - 1);
              edge.sourceText = text;
              edge.utteranceText = text;
              edge.end = other.start - 2;
              edge.len = text.length;
            } else {
              const text = edge.sourceText.substring(edgeLen - otherLen + 2);
              edge.sourceText = text;
              edge.utteranceText = text;
              edge.start = other.end + 2;
              edge.len = text.length;
            }
          }
        }
      }
    }
    return edges;
  }
 
  /**
   * Execute a pre-reduction of edges before running the final reduce edges.
   * @param {Object[]} edges Array of edges.
   * @returns {Object[]} Array of reduced edges.
   */
  prereduceEdges(edges) {
    for (let i = 0, l = edges.length; i < l; i += 1) {
      const edge = edges[i];
      if (!edge.discarded) {
        for (let j = i + 1; j < l; j += 1) {
          const other = edges[j];
          if (!other.discarded) {
            if (other.start === edge.start && other.end === edge.end) {
              Iif (other.entity === 'number' && edge.entiy === 'ordinal') {
                other.discarded = true;
              } else if (
                other.entity === 'ordinal' &&
                edge.entity === 'number'
              ) {
                edge.discarded = true;
              } else if (
                other.entity === edge.entity &&
                edge.entity === 'number'
              ) {
                if (
                  (other.sourceText.includes(',') ||
                    other.sourceText.includes('.')) &&
                  parseFloat(other.sourceText.replace(',', '.')) !==
                    parseFloat(other.resolution.strValue.replace(',', '.'))
                ) {
                  other.discarded = true;
                }
                if (
                  (edge.sourceText.includes(',') ||
                    edge.sourceText.includes('.')) &&
                  parseFloat(edge.sourceText.replace(',', '.')) !==
                    parseFloat(edge.resolution.strValue.replace(',', '.'))
                ) {
                  edge.discarded = true;
                }
              }
            }
          }
        }
      }
    }
    const result = [];
    for (let i = 0, l = edges.length; i < l; i += 1) {
      if (!edges[i].discarded) {
        result.push(edges[i]);
      }
    }
    return result;
  }
 
  /**
   * Extract built-in entities for the utterance given the language.
   * @param {string} utterance Input utterance.
   * @param {string} language Language locale.
   * @returns {Object[]} Extracted entities as edges array.
   */
  findBuiltinEntities(utterance, language) {
    const result = [];
    const culture = NlpUtil.getCulture(language);
    this.builtins.forEach(name => {
      try {
        const entities = Recognizers[`recognize${name}`](utterance, culture);
        if (name === 'Number') {
          entities.push(
            ...Recognizers.recognizeNumber(utterance, NlpUtil.getCulture('en'))
          );
        }
        for (let i = 0; i < entities.length; i += 1) {
          const entity = entities[i];
          let entityName = entity.typeName;
          const index = entityName.lastIndexOf('.');
          if (index !== -1) {
            entityName = entityName.slice(index + 1);
          }
          Eif (this.builtinWhitelist[entityName]) {
            const text = utterance.slice(entity.start, entity.end + 1);
            const accuracy = 0.95;
            const edge = {
              start: entity.start,
              end: entity.end,
              len: entity.end - entity.start + 1,
              accuracy,
              sourceText: text,
              utteranceText: text,
              entity: entityName,
            };
            const resolution = this.calculateResolution(entity, language);
            if (resolution) {
              edge.resolution = resolution;
            }
            result.push(edge);
          }
        }
      } catch (ex) {
        //
      }
    });
    return this.similar
      .reduceEdges(this.prereduceEdges(result), false)
      .sort((a, b) => a.start - b.start);
  }
 
  /**
   * Find entities inside an utterance.
   * @param {String} utterance Utterance for searching entities.
   * @param {String} locale Locale of the language.
   * @param {String[]} whitelist Whitelist of entity names.
   * @param {boolean} includeBuiltin Include built-in entities.
   * @returns {Promise.Object[]} Promise edges of entities found.
   */
  findEntities(utterance, language, whitelist, includeBuiltin = true) {
    let witelistMap;
 
    if (whitelist) {
      witelistMap = {};
      whitelist.forEach(item => {
        const name = item.replace(/_\d+/g, '');
        if (!witelistMap[name]) {
          witelistMap[name] = [];
        }
        witelistMap[name].push(item);
      });
    }
 
    const entityNames = Object.keys(witelistMap || this.namedEntities);
    const wordPositions = this.similar.getWordPositions(utterance);
    let edges = includeBuiltin
      ? this.findBuiltinEntities(utterance, language)
      : [];
 
    entityNames.forEach(entityName => {
      const entity = this.namedEntities[entityName];
      if (entity) {
        const newEdges = entity.extract(
          utterance,
          language,
          this.similar,
          wordPositions,
          this.threshold
        );
        edges = [...edges, ...newEdges];
      }
    });
 
    edges.sort((a, b) => a.start - b.start);
 
    if (witelistMap) {
      edges = edges.map(item => {
        const edge = item;
        Eif (witelistMap[item.entity]) {
          edge.entity = witelistMap[item.entity].shift() || item.entity;
        } else {
          edge.entity = item.entity;
        }
        return edge;
      });
    }
 
    return this.similar.reduceEdges(this.splitEdges(edges), false);
  }
 
  findNamedEntities(utterance, language, whitelist) {
    return this.findEntities(utterance, language, whitelist, false);
  }
 
  /**
   * Find entities on utterance, and replace them by the entity name.
   * @param {String} utterance Utterance to be processed.
   * @param {String} locale Locale of the utterance.
   * @returns {Promise.String} Promise utterance with entities replaced by entity name.
   */
  async generateEntityUtterance(utterance, locale) {
    const entities = await this.findEntities(utterance, locale);
    if (entities.length === 0) {
      return utterance;
    }
    entities.sort((a, b) => a.start - b.start);
    let index = 0;
    let result = '';
    for (let i = 0; i < entities.length; i += 1) {
      const entity = entities[i];
      const left = utterance.slice(index, entity.start);
      index = entity.end + 1;
      result += left;
      result += `%${entity.entity}%`;
    }
    const right = utterance.slice(entities[entities.length - 1].end + 1);
    result += right;
    return result;
  }
 
  generateNamedEntityUtterance(utterance, locale) {
    const entities = this.findNamedEntities(utterance, locale);
    if (entities.length === 0) {
      return undefined;
    }
    let index = 0;
    let result = '';
    for (let i = 0; i < entities.length; i += 1) {
      const entity = entities[i];
      const left = utterance.slice(index, entity.start);
      index = entity.end;
      result += left;
      result += `%${entity.entity}%`;
    }
    const right = utterance.slice(entities[entities.length - 1].end + 1);
    result += right;
    return result;
  }
 
  /**
   * Returns a clone object representing this, for saving.
   * @returns {Object} Clone object.
   */
  save() {
    const result = {};
    result.settings = this.settings;
    result.threshold = this.threshold;
    result.builtins = this.builtins;
    result.namedEntities = {};
    const keys = Object.keys(this.namedEntities);
    for (let i = 0; i < keys.length; i += 1) {
      const entity = this.namedEntities[keys[i]];
      const clone = {
        type: entity.type,
        name: entity.name,
        localeFallback: entity.localeFallback,
      };
      if (entity.type === 'enum') {
        clone.locales = entity.locales;
      } else if (entity.type === 'regex') {
        clone.locales = {};
        const localeKeys = Object.keys(entity.locales);
        for (let j = 0; j < localeKeys.length; j += 1) {
          clone.locales[localeKeys[j]] = {
            regex: RegexNamedEntity.regex2str(
              entity.locales[localeKeys[j]].regex
            ),
          };
        }
      } else Eif (entity.type === 'trim') {
        clone.locales = {};
        const localeKeys = Object.keys(entity.locales);
        for (let j = 0; j < localeKeys.length; j += 1) {
          clone.locales[localeKeys[j]] = {
            conditions: [],
          };
          const { conditions } = entity.locales[localeKeys[j]];
          const cloneConditions = clone.locales[localeKeys[j]].conditions;
          for (let k = 0; k < conditions.length; k += 1) {
            const condition = conditions[k];
            const cloneCondition = {};
            cloneCondition.type = condition.type;
            cloneCondition.options = condition.options;
            if (condition.type === 'between') {
              cloneCondition.leftWords = condition.leftWords;
              cloneCondition.rightWords = condition.rightWords;
              cloneCondition.regex = RegexNamedEntity.regex2str(
                condition.regex
              );
            } else {
              cloneCondition.words = condition.words;
            }
            cloneConditions.push(cloneCondition);
          }
        }
      }
      result.namedEntities[keys[i]] = clone;
    }
    return result;
  }
 
  /**
   * Load this instance from an object.
   * @param {Object} obj Object to load from.
   */
  load(obj) {
    this.settings = obj.settings;
    this.threshold = obj.threshold;
    this.builtins = obj.builtins || [];
    const keys = Object.keys(obj.namedEntities);
    for (let i = 0; i < keys.length; i += 1) {
      const cloned = obj.namedEntities[keys[i]];
      const entity = this.addNamedEntity(cloned.name, cloned.type);
      if (cloned.type === 'enum') {
        entity.locales = cloned.locales;
      } else if (cloned.type === 'regex') {
        const localeKeys = Object.keys(cloned.locales);
        for (let j = 0; j < localeKeys.length; j += 1) {
          entity.locales[localeKeys[j]] = {
            regex: RegexNamedEntity.str2regex(
              cloned.locales[localeKeys[j]].regex
            ),
          };
        }
      } else Eif (cloned.type === 'trim') {
        const localeKeys = Object.keys(cloned.locales);
        for (let j = 0; j < localeKeys.length; j += 1) {
          entity.locales[localeKeys[j]] = {
            conditions: [],
          };
          const clonedConditions = cloned.locales[localeKeys[j]].conditions;
          const { conditions } = entity.locales[localeKeys[j]];
          for (let k = 0; k < clonedConditions.length; k += 1) {
            const condition = {
              type: clonedConditions[k].type,
              options: clonedConditions[k].options,
            };
            if (condition.type === 'between') {
              condition.leftWords = clonedConditions[k].leftWords;
              condition.rightWords = clonedConditions[k].rightWords;
              condition.regex = RegexNamedEntity.str2regex(
                clonedConditions[k].regex
              );
            } else {
              condition.words = clonedConditions[k].words;
            }
            conditions.push(condition);
          }
        }
      }
    }
  }
}
 
module.exports = NerManager;