PHP code example of ryangjchandler / lexical

1. Go to this page and download the library: Download ryangjchandler/lexical library. Choose the download type require.

2. Extract the ZIP file and open the index.php.

3. Add this code to the index.php. 
    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

ryangjchandler / lexical example snippets


enum TokenType
{
    case Number;
    case Add;
    case Subtract;
    case Multiply;
    case Divide;
}


enum TokenType
{
    #[Regex("[0-9]+")]
    case Number;
    
    #[Literal("+")]
    case Add;
    
    #[Literal("-")]
    case Subtract;
    
    #[Literal("*")]
    case Multiply;

    #[Literal("/")]
    case Divide;
}


$lexer = (new LexicalBuilder)
    ->readTokenTypesFrom(TokenType::class)
    ->build();


$tokens = $lexer->tokenise('1+2'); // -> [[TokenType::Number, '1', Span(0, 1)], [TokenType::Add, '+', Span(1, 2)], [TokenType::Number, '2', Span(2, 3)]]


#[Lexer(skip: "[ \t\n\f]+")]
enum TokenType
{
    // ...
}


try {
    $tokens = $lexer->tokenise();
} catch (UnexpectedCharacterException $e) {
    dd($e->character, $e->position);
}


enum TokenType
{
    // ...

    #[Error]
    case Error;
}


$tokens = $lexer->tokenise('1 % 2'); // -> [[TokenType::Number, '1'], [TokenType::Error, '%'], [TokenType::Number, '2']]


class Token
{
    public function __construct(
        public readonly TokenType $type,
        public readonly string $literal,
        public readonly Span $span,
    ) {}
}

$lexer = (new LexicalBuilder)
    ->readTokenTypesFrom(TokenType::class)
    ->produceTokenUsing(fn (TokenType $type, string $literal, Span $span) => new Token($type, $literal, $span))
    ->build();

$lexer->tokenise('1 + 2'); // -> [Token { type: TokenType::Number, literal: "1" }, ...]