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import Lexer from 'botlang/src/Lexer/Lexer.js'

public class | source

Lexer

The botlang lexer takes an instance of Input as a constructor argument and produces a token stream for further processing in the parser.

Test:

test/Lexer/Lexer.spec.js

Constructor Summary

Public Constructor
public	constructor(input: Input): void Create a Lexer.

Method Summary

Public Methods
public	eof(): Boolean Determine whether or not the lexer has reached the input's eof
public	inputError(message: String): void Throw a new Error.
public	next(): Token \| null Return the next token in from the input stream or `null` if the end of file has been reached
public	peek(): Token Return the current token or get the first token if `next` has not been called yet.

Public Constructors

public constructor(input: Input): void source

Create a Lexer.

Params:

Name	Type	Attribute	Description
input	Input

Return:

void

Throw:

Test:

#constructor

Public Methods

public eof(): Boolean source

Determine whether or not the lexer has reached the input's eof

Return:

public inputError(message: String): void source

Throw a new Error.

Params:

Name	Type	Attribute	Description
message	String

Return:

void

Throw:

public next(): Token | null source

Return the next token in from the input stream or null if the end of file has been reached

Return:

Test:

#next

public peek(): Token source

Return the current token or get the first token if next has not been called yet.

Return:

Test:

#peek