Aksharas

Aksharas is an utility for analysing akṣaras and varṇas in a Devanagari text.

Installation

npm i @vipran/aksharas

Usage

import Aksharas from "@vipran/aksharas";

// OR for CommonJS:
// const Aksharas = require("@vipran/aksharas").default;

const input = "सर्वे भवन्तु सुखिनः।"

const results = Aksharas.analyse(input);

const aksharas = results.aksharas.map(akshara => akshara.value);

console.log(aksharas); // "स", "र्वे", "भ", "व", "न्तु", "सु", "खि", "नः"

API

Aksharas.analyse()

Accepts a string input and returns a Results object.

const input: string = 'नमः';
const results: Results = Aksharas.analyse(input);

Aksharas.TokenType

It is an enum with the following values:

• TokenType.Akshara
• TokenType.Symbol
• TokenType.Whitespace
• TokenType.Invalid
• TokenType.Unrecognised

These can be used to filter the tokens in the Results object. Example:

import Aksharas from "@vipran/aksharas";
// OR import Aksharas, { TokenType } ...

const input = "हे! हरेऽत्र नागच्छ।";
const results = Aksharas.analyse(input);
const symbols = results.all
  .filter((token) => token.type === Aksharas.TokenType.Symbol)
  .map((token) => token.value);

console.log(symbols); // "ऽ", "।"

Aksharas.VarnaType

It is an enum with the following values:

• VarnaType.Svara
• VarnaType.Vyanjana

These can be used to filter the varnas in Results.varnas. Example:

import Aksharas from "@vipran/aksharas";
// OR import Aksharas, { VarnaType } ...

const input = "गुरुः";
const results = Aksharas.analyse(input);

const svaras = results.varnas
  .filter((varna) => varna.type === Aksharas.VarnaType.Svara)
  .map((varna) => varna.value);

console.log(svaras); // "उ", "उः"

Results

The Results object contains the following properties:

• all
  • type: Token[]
  • An array of Token objects containing all the tokens analysed from input string. It includes Devanagari akṣaras, Devanagari symbols (१, २, ।, ॥, etc.) and non-devangari characters (i.e. characters in other scripts, special characters, whitespace characters, etc.)
• aksharas
  • type: Token[]
  • Devanagari syllables like रा, सी, etc. Here, halanta consonants such as क्, च्, य्, etc. are also considered as aksharas when they are at the end of a word.
• varnas
  • type: Varna[]
  • Devanagari consonants and vowels in the input. (Only in v0.4.0 or above.)
• symbols
  • type: Token[]
  • Devanagari symbols such as १, २, ।, ॥, etc.
• whitespaces
  • type: Token[]
  • All whitespace characters: \s, \t, \n, etc.
• invalid
  • type: Token[]
  • All Devanagari characters whose occurance in the input string do not conform to the definition of an akṣara. For example, a virāma or a vowel mark which is not preceded by a consonant is invalid. ("अ्", "गोु", etc.)
• unrecognised
  • type: Token[]
  • Non-devangari characters (i.e. characters in other scripts and special characters such as @, #, etc.)
• chars
  • type: string[]
  • All Unicode characters in the input string. Same as String.prototype.split().

Token

Many of the properties in the Results object consists of an array of Token-s. A Token object has the following properties:

• type
  • type: TokenType
  • Type of the token. One of the values of Aksharas.TokenType.
• value
  • type: string
  • Conatins an analysed part of the input string.
• from
  • type: number
  • From index - representing the start position of the token in the input string.
• to
  • type: number
  • To index - representing the end position of the token in the input string.
• attributes
  • type: Record<string, any>
  • An optional key-value object which may contain other attributes of the token. It is currently used only in the Akshara tokens for storing the varnas in that akshara.

Varna

Results.varnas consists of an array of Varna objects. A Varna object has the following properties:

• type
  • type: VarnaType
  • Type of the token. One of the values of Aksharas.VarnaType.
• value
  • type: string
  • Conatins an analysed part of the input string.

License

MIT © Prasanna Venkatesh T S