tokenizer

Documentation

Overview

Package tokenizer is a japanese morphological analyzer library.

Example (Tokenize_mode)

d, err := prepareTestDict()
if err != nil {
	panic(err)
}
t, err := New(d)
if err != nil {
	panic(err)
}
for _, mode := range []TokenizeMode{Normal, Search, Extended} {
	tokens := t.Analyze("関西国際空港", Normal)
	fmt.Printf("---%s---", mode)
	for _, token := range tokens {
		if token.Class == DUMMY {
			// BOS: Begin Of Sentence, EOS: End Of Sentence.
			fmt.Printf("%s\n", token.Surface)
			continue
		}
		features := strings.Join(token.Features(), ",")
		fmt.Printf("%s\t%v\n", token.Surface, features)
	}
}

Index

• Constants
• type Option
  • func Nop() Option
  • func OmitBosEos() Option
  • func UserDict(d *dict.UserDict) Option
• type Token
  • func (t Token) BaseForm() (string, bool)
  • func (t Token) Equal(v Token) bool
  • func (t Token) FeatureAt(i int) (string, bool)
  • func (t Token) Features() []string
  • func (t Token) InflectionalForm() (string, bool)
  • func (t Token) InflectionalType() (string, bool)
  • func (t Token) POS() []string
  • func (t Token) Pronunciation() (string, bool)
  • func (t Token) Reading() (string, bool)
  • func (t Token) String() string
• type TokenClass
  • func (c TokenClass) String() string
• type TokenData
  • func NewTokenData(t Token) TokenData
• type TokenizeMode
  • func (m TokenizeMode) String() string
• type Tokenizer
  • func New(d *dict.Dict, opts ...Option) (*Tokenizer, error)
  • func (t Tokenizer) Analyze(input string, mode TokenizeMode) []Token
  • func (t Tokenizer) AnalyzeGraph(w io.Writer, input string, mode TokenizeMode) []Token
  • func (t Tokenizer) Dot(w io.Writer, input string) (tokens []Token)
  • func (t Tokenizer) Tokenize(input string) []Token
  • func (t Tokenizer) Wakati(input string) []string

Examples

• Package (Tokenize_mode)

Constants

const (
	// DUMMY represents the dummy token.
	DUMMY = TokenClass(lattice.DUMMY)
	// KNOWN represents the token in the dictionary.
	KNOWN = TokenClass(lattice.KNOWN)
	// UNKNOWN represents the token which is not in the dictionary.
	UNKNOWN = TokenClass(lattice.UNKNOWN)
	// USER represents the token in the user dictionary.
	USER = TokenClass(lattice.USER)
)

Types

type Option

type Option func(*Tokenizer) error

Option represents an option for the tokenizer.

func Nop

func Nop() Option

Nop represents a no operation option.

func OmitBosEos

func OmitBosEos() Option

OmitBosEos is a tokenizer option to omit BOS/EOS from output tokens.

func UserDict

func UserDict(d *dict.UserDict) Option

UserDict is a tokenizer option to sets a user dictionary.

type Token

type Token struct {
	Index    int
	ID       int
	Class    TokenClass
	Position int // byte position
	Start    int
	End      int
	Surface  string
	// contains filtered or unexported fields
}

Token represents a morph of a sentence.

func (Token) BaseForm

func (t Token) BaseForm() (string, bool)

BaseForm returns the base form features if exists.

func (Token) Equal

func (t Token) Equal(v Token) bool

Equal returns true if tokens are equal.

func (Token) FeatureAt

func (t Token) FeatureAt(i int) (string, bool)

FeatureAt returns the i th feature if exists.

func (Token) Features

func (t Token) Features() []string

Features returns contents of a token.

func (Token) InflectionalForm

func (t Token) InflectionalForm() (string, bool)

InflectionalForm returns the inflectional form feature if exists.

func (Token) InflectionalType

func (t Token) InflectionalType() (string, bool)

InflectionalType returns the inflectional type feature if exists.

func (Token) POS

func (t Token) POS() []string

POS returns POS elements of features.

func (Token) Pronunciation

func (t Token) Pronunciation() (string, bool)

Pronunciation returns the pronunciation feature if exists.

func (Token) Reading

func (t Token) Reading() (string, bool)

Reading returns the reading feature if exists.

func (Token) String

func (t Token) String() string

String returns a string representation of a token.

type TokenClass

type TokenClass lattice.NodeClass

TokenClass represents the token class.

func (TokenClass) String

func (c TokenClass) String() string

String returns string representation of a token class.

type TokenData

type TokenData struct {
	ID            int      `json:"id"`
	Start         int      `json:"start"`
	End           int      `json:"end"`
	Surface       string   `json:"surface"`
	Class         string   `json:"class"`
	POS           []string `json:"pos"`
	BaseForm      string   `json:"base_form"`
	Reading       string   `json:"reading"`
	Pronunciation string   `json:"pronunciation"`
	Features      []string `json:"features"`
}

TokenData is a data format with all the contents of the token.

func NewTokenData

func NewTokenData(t Token) TokenData

NewTokenData returns a data which has with all the contents of the token.

type TokenizeMode

type TokenizeMode int

TokenizeMode represents a mode of tokenize.

Kagome has segmentation mode for search such as Kuromoji.

Normal: Regular segmentation
Search: Use a heuristic to do additional segmentation useful for search
Extended: Similar to search mode, but also unigram unknown words

const (
	// Normal is the normal tokenize mode.
	Normal TokenizeMode = iota + 1
	// Search is the tokenize mode for search.
	Search
	// Extended is the experimental tokenize mode.
	Extended
	// BosEosID means the beginning a sentence (BOS) or the end of a sentence (EOS).
	BosEosID = lattice.BosEosID
)

func (TokenizeMode) String

func (m TokenizeMode) String() string

type Tokenizer

type Tokenizer struct {
	// contains filtered or unexported fields
}

Tokenizer represents morphological analyzer.

func New

func New(d *dict.Dict, opts ...Option) (*Tokenizer, error)

New creates a tokenizer.

func (Tokenizer) Analyze

func (t Tokenizer) Analyze(input string, mode TokenizeMode) []Token

Analyze tokenizes a sentence in the specified mode.

func (Tokenizer) AnalyzeGraph

func (t Tokenizer) AnalyzeGraph(w io.Writer, input string, mode TokenizeMode) []Token

AnalyzeGraph returns morphs of a sentence and exports a lattice graph to dot format.

func (Tokenizer) Dot

func (t Tokenizer) Dot(w io.Writer, input string) (tokens []Token)

Dot returns morphs of a sentence and exports a lattice graph to dot format in standard tokenize mode.

func (Tokenizer) Tokenize

func (t Tokenizer) Tokenize(input string) []Token

Tokenize analyzes a sentence in standard tokenize mode.

func (Tokenizer) Wakati

func (t Tokenizer) Wakati(input string) []string

Wakati tokenizes a sentence and returns its divided surface strings.