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persian-preprocess

v1.0.0

Published

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

Downloads

5

Readme

persian-preprocess

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

Table of contents

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