persian-preprocess

v1.0.0

Published

3 years ago

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

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webilix

persian farsi text preprocess pre process normalize number punctuation whitespace white space stop word stopword

persian-preprocess

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

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

| 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 &lt;  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',
      '&lt;', '℅', '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

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Readme

persian-preprocess

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