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EntityRecognizer class

  • Reference
Package:
botbuilder

Utility class used to parse & resolve common entities like datetimes received from LUIS.

Methods

expandChoices(string | Object | string[])

Converts a set of choices into an expanded array.
findAllEntities(IEntity[], string)

Finds all occurrences of a specific entity type within a set.
findAllMatches(string | Object | string[], string, number)

Finds all possible matches for a users utterance given a list of choices.
findBestMatch(string | Object | string[], string, number)

Finds the best match for a users utterance given a list of choices.
findEntity(IEntity[], string)

Searches for the first occurance of a specific entity type within a set.
parseBoolean(string)

Parses a boolean from a users utterance.
parseNumber(string | IEntity[])

Parses a number from either a users text utterance or a set of entities.
parseTime(string | IEntity[])

Parses a date from either a users text utterance or a set of entities.
recognizeTime(string, Date)

Recognizes a time from a users utterance. The utterance is parsed using the Chrono library.
resolveTime(IEntity[])

Calculates a Date from a set of datetime entities.

Method Details

expandChoices(string | Object | string[])

Converts a set of choices into an expanded array.

static function expandChoices(choices: string | Object | string[])

Parameters

choices

string | Object | string[]

  • choices: {string} - Pipe ('|') delimited list of values.
  • choices: {Object} - Object used to generate the list of choices. The objects field names will be used to build the list of choices.
  • choices: {string[]} - Array of strings. This will just be echoed back as the output.

Returns

string[]

findAllEntities(IEntity[], string)

Finds all occurrences of a specific entity type within a set.

static function findAllEntities(entities: IEntity[], type: string)

Parameters

entities

IEntity[]

Set of entities to search over.

type

string

Type of entity to find.

Returns

IEntity[]

findAllMatches(string | Object | string[], string, number)

Finds all possible matches for a users utterance given a list of choices.

static function findAllMatches(choices: string | Object | string[], utterance: string, threshold?: number)

Parameters

choices

string | Object | string[]

  • choices: {string} - Pipe ('|') delimited list of values to compare against the users utterance.
  • choices: {Object} - Object used to generate the list of choices. The objects field names will be used to build the list of choices.
  • choices: {string[]} - Array of strings to compare against the users utterance.
utterance

string

Text utterance to parse.

threshold

number

(Optional) minimum score needed for a match to be considered. The default value is 0.6.

Returns

IFindMatchResult[]

findBestMatch(string | Object | string[], string, number)

Finds the best match for a users utterance given a list of choices.

static function findBestMatch(choices: string | Object | string[], utterance: string, threshold?: number)

Parameters

choices

string | Object | string[]

  • choices: {string} - Pipe ('|') delimited list of values to compare against the users utterance.
  • choices: {Object} - Object used to generate the list of choices. The objects field names will be used to build the list of choices.
  • choices: {string[]} - Array of strings to compare against the users utterance.
utterance

string

Text utterance to parse.

threshold

number

(Optional) minimum score needed for a match to be considered. The default value is 0.6.

Returns

IFindMatchResult

findEntity(IEntity[], string)

Searches for the first occurance of a specific entity type within a set.

static function findEntity(entities: IEntity[], type: string)

Parameters

entities

IEntity[]

Set of entities to search over.

type

string

Type of entity to find.

Returns

IEntity

parseBoolean(string)

Parses a boolean from a users utterance.

static function parseBoolean(value: string)

Parameters

value

string

Text utterance to parse.

Returns

boolean

A valid boolean otherwise undefined.

parseNumber(string | IEntity[])

Parses a number from either a users text utterance or a set of entities.

static function parseNumber(value: string | IEntity[])

Parameters

value

string | IEntity[]

  • value: {string} - Text utterance to parse.
  • value: {IEntity[]} - Set of entities to resolve.

Returns

number

A valid number otherwise Number.NaN.

parseTime(string | IEntity[])

Parses a date from either a users text utterance or a set of entities.

static function parseTime(value: string | IEntity[])

Parameters

value

string | IEntity[]

  • value: {string} - Text utterance to parse. The utterance is parsed using the Chrono library.
  • value: {IEntity[]} - Set of entities to resolve.

Returns

Date

A valid Date object if the user spoke a time otherwise null.

recognizeTime(string, Date)

Recognizes a time from a users utterance. The utterance is parsed using the Chrono library.

static function recognizeTime(utterance: string, refDate?: Date)

Parameters

utterance

string

Text utterance to parse.

refDate

Date

(Optional) reference date used to calculate the final date.

Returns

IEntity

An entity containing the resolved date if successful or null if a date couldn't be determined.

resolveTime(IEntity[])

Calculates a Date from a set of datetime entities.

static function resolveTime(entities: IEntity[])

Parameters

entities

IEntity[]

List of entities to extract date from.

Returns

Date

The successfully calculated Date or null if a date couldn't be determined.