persian-preprocess

persian-preprocess

Persian (Farsi) text pre processing (normalize, number, punctuation, white space, stop word & ...)

Table of contents

• Installation
• Setup
• Usage
• API Features
  • number
  • punctuation
  • remove
  • stopword
  • emoticon
  • whitespace
  • toString
  • toArray
  • toUnique
  • getDebug
• Full Sample
• Debug Info
• Tests

Installation

npm install --save persian-preprocess

Setup

const persianPreProcess = require('persian-preprocess');

Usage

Parameter	Type	Required	Descriptiopn
text	String	Yes	Text to process
debug	Boolean	Yes	Debug system status

const text = 'text to process';
const debug = true;
const processedText = persianPreProcess(text, debug)
    .normalize()
    .number()
    .lowercase()
    .punctuation()
    .remove()
    .stopword()
    .emoticon()
    .whitespace();

• Above code is just a sample of all pre process methods and because some of the methods require parameters this code won't work correctly. For complete functional sample please check Full Sample

API Features

Normalization Methods	Description
normalize	Normalization process
number	Change numbers locale
lowercase	Lowercase all characters
punctuation	Remove punctuation
remove	Remove selected characters
stopword	Remove stop words
emoticon	Remove emoticons
whitespace	Remove duplicate whitespaces

Result Methods	Description
toString	Get processed text
toArray	Get list of all words
toUnique	Get list of unique words
getDebug	Get pre process debug data

normalize

Normalization process

Parameter	Type	Required	Descriptiopn
config	Object	No	Normalization config (table below)

Configuration	Type	Description	Sample Characters
persian	boolean	Normalize persian characters	ﭐ ݓ ك ﻱ
english	boolean	Normalize english characters	ᗩ ℳ Ѡ ⓡ ⒵
arabic	boolean	Normalize arabic characters	ﷲ ﷺ
number	boolean	Normalize number characters	٥ ⑩
math	boolean	Normalize math characters	¼ ⅞
html	boolean	Normalize html characters	  <
punctuation	boolean	Normalize punctuation characters	ʕ ʔ ℅ ٪
special	boolean	Normalize special characters	ᴁ lj st

• Default value for all configurations sets is true and the normalization process will use for all of them by default
• Setting configurations value to false will ignore normalization process for the set

// No configuration (using default value)
const processedText = persianPreProcess(text, debug).normalize();

// Default configuration (Same result with the code above)
const processedText = persianPreProcess(text, debug).normalize({
    persian: true,
    english: true,
    arabic: true,
    number: true,
    math: true,
    html: true,
    punctuation: true,
    special: true
});

// Ignore HTML characters normalization
const processedText = persianPreProcess(text, debug).normalize({
    html: false
});

number

Change numbers locale

Parameter	Type	Required	Descriptiopn
language	Enum: 'persian', 'english'	Yes	Numeric characters locale

// 0, 1 ... 9
const processedText = persianPreProcess(text, debug).number('english');

// ۰, ۱, ... ۹
const processedText = persianPreProcess(text, debug).number('persian');

lowercase

Lowercase all characters

// 'Hello' => 'hello'
const processedText = persianPreProcess(text, debug).lowercase();

punctuation

Remove punctuation

Parameter	Type	Required	Descriptiopn
config	Object	No	Punctuation removal config (table below)

Configuration	Type	Description	Sample Characters
basic	boolean or null	Basic punctuations	' " \ / , ( | )
mark	boolean or null	Special punctuations	\r \n \t \0
diacritic	boolean or null	Arabic diacritics	ٌ ٍ ً ّ
unicode	boolean or null	Unicode punctuations	ZERO WIDTH NON-JOINER

• Default value for all configurations sets is true and the punctuations will remove using space character
• Setting value to null will remove the punctuations and wont replace them with any character
• Setting value to false will ignore punctuations removal for the set

// No configuration (using default value)
const processedText = persianPreProcess(text, debug).punctuation();

// Default configuration (Same result with the code above)
const processedText = persianPreProcess(text, debug).punctuation({
    basic: true,
    mark: true,
    diacritic: true,
    unicode: true
});

// Ignore UNICODE punctuation removal
const processedText = persianPreProcess(text, debug).punctuation({
    unicode: false
});

/**
 * Using NULL as configuration value for basic punctuations
 *
 * Using true (default value): 'in-line' > 'in line'
 * Using null                : 'in-line' > 'inline'
 */
const processedText = persianPreProcess(text, debug).punctuation({
    basic: null
});

remove

Remove selected characters

Parameter	Type	Required	Descriptiopn
config	Object	No	Character removal config (table below)

Configuration	Type	Description	Sample Characters
number	boolean or null	Numeric characters	0 9 ۰ ۹
persian	boolean or null	Persian characters	آ ا ی
english	boolean or null	English characters	A Z a z
length	number	Words with specific length

• for number, persian and english configurations

  • Default value is false and the character removal process will be ignored by default
  • Setting value to true will remove all the chacters in set and replace them with space character
  • Setting value to null will remove the characters and wont replace them with any character

• Setting length configuration will remove all words with the length equal or less than given value

/**
 * No configuration (using default value)
 * Using method with no configuration wont make any changes to text
 */
const processedText = persianPreProcess(text, debug).remove();

// Removing all characters
const processedText = persianPreProcess(text, debug).remove({
    number: true,
    persian: true,
    english: true
});

/**
 * Using NULL as configuration value for english characters
 *
 * Using true : 'in-line' > 'in line'
 * Using null : 'in-line' > 'inline'
 */
const processedText = persianPreProcess(text, debug).remove({
    english: null
});

/**
 * Using length configuration
 * 'this is a text' > 'this   text'
 */
const processedText = persianPreProcess(text, debug).remove({
    length: 2
});

stopword

Remove stop words

Parameter	Type	Required	Descriptiopn
config	Object	No	Stopword removal config (table below)

Configuration	Type	Description	Sample Words
persian	boolean	Persian stopwords	در با به
english	boolean	English stopwords	in at on
custom	string[]	List of custom Words

• for persian and english configurations

  • Default value is false and the stopwords removal process will be ignored by default
  • Setting value to true will remove all the stopwords in set

• Setting custom configuration will remove all words in given list

/**
 * No configuration (using default value)
 * Using method with no configuration wont make any changes to text
 */
const processedText = persianPreProcess(text, debug).stopword();

// Removing all stopwords
const processedText = persianPreProcess(text, debug).stopword({
    persian: true,
    english: true
});

/**
 * Using custom list configuration
 * 'this is a text' > ' is  text'
 */
const processedText = persianPreProcess(text, debug).stopword({
    custom: ['this', 'a']
});

emoticon

Remove emoticons

Parameter	Required	Descriptiopn
replace	No	Value of this parameter can only be NULL

• Be default (calling method with no parameter) all emoticons will remove using space character
• Setting replace value to null will remove the emoticons and wont replace them with any character

// No configuration (using default value)
const processedText = persianPreProcess(text, debug).emoticon();

/**
 * Using NULL as replace parameter value
 *
 * No parameter : 'I💓U' > 'I U'
 * Using null   : 'I💓U' > 'IU'
 */
const processedText = persianPreProcess(text, debug).emoticon(null);

whitespace

Remove duplicate whitespaces

// 'this is     a  text    ' => 'this is a text '
const processedText = persianPreProcess(text, debug).whitespace();

toString

Get processed text

/**
 * text   : '❶ text and ❶ number'
 * result : '1 text and 1 number'
 */
const stringValue = processedText.toString();

toArray

Get list of all words

/**
 * text   : '❶ text and ❶ number'
 * result : ['1', 'text', 'and', '1', 'number']
 */
const arrayList = processedText.toArray();

toUnique

Get list of unique words

/**
 * text   : '❶ text and ❶ number'
 * result : ['1', 'text', 'and', 'number']
 */
const uniqueList = processedText.toUnique();

getDebug

Get pre process debug data

// See Full Sample
const debugInfo = processedText.getDebug();

Full Sample

const text = `
    استفاده از حرف ك عربی و کاراکتر خاص ﷼ و عدد عربی ٦
    انگلیسی: using ß character and ⅜ and <  ⒄℅
    حط دوم انگلیسی: and special character: NJ
    شکلک:  😃 👦🏿 🚩 👱🏽 🍉 🏒 🚍 🥬
    انتهای متن
`;

const persianPreProcess = require('persian-preprocess');
const processedText = persianPreProcess(text, true)
    // Normalize
    .normalize()
    // Change number locale to persian
    .number('persian')
    // Lowercase all characters
    .lowercase()
    // Remove all punctuation except marks (i.e.: \n)
    .punctuation({
        mark: false
    })
    // Remove all numeric characters (not using space space character)
    .remove({
        number: null,
    })
    // Remove persian, english and two custom stop words
    .stopword({
        custom: ['حرف', 'خط']
    })
    // Remove emoticons
    .emoticon()
    // Remove duplicate whitespaces
    .whitespace();

const result = processedText.toString();
/**
استفاده عربی کاراکتر خاص ریال عدد عربی
 انگلیسی using b character
 انگلیسی special character nj
 شکلک
 انتهای متن
*/

console.log(processedText.getDebug());
/**
 * Setting debug parameter as true for persianPreProcess
 * will activate debug system and debug data will be like:
 */
{
  TOTAL: { duration: 0.054, change: -96, length: 212 },
  normilize: {
    duration: 0.018,
    change: 4,
    length: 216,
    match: [
      'ك',    'ß', '﷼',
      '٦',    '⒄', '⅜',
      '<', '℅', 'NJ'
    ]
  },
  number: { duration: 0.001, change: 0, length: 216, match: [] },
  lowercase: { duration: 0, change: 0, length: 216 },
  punctuation: {
    duration: 0,
    change: 0,
    length: 216,
    match: [ ':', '/', '<', '%' ]
  },
  remove: {
    duration: 0,
    change: -5,
    length: 211,
    match: [ '۶', '۳', '۸', '۱', '۷' ]
  },
  stopword: {
    duration: 0.028,
    change: -6,
    length: 205,
    match: [
      'and',  ' دوم ',
      ' از ', ' ک ',
      ' و ',  ' حرف ',
      ' حط '
    ]
  },
  emoticon: {
    duration: 0.002,
    change: -10,
    length: 195,
    match: [
      '😃', '👦', '🏿',
      '🚩', '👱', '🏽',
      '🍉', '🏒', '🚍',
      '🥬'
    ]
  },
  whitespace: { duration: 0.001, change: -79, length: 116 }
}

Debug Info

Name	Description
duration	Process time in millisecond
change	Number of characters added or removed from Text value
length	Text value length after process
match	List of matched characters/words in process

Tests

git clone https://github.com/webilix/persian-preprocess.git
npm install
npm test