PHP code example of krak / lex

1. Go to this page and download the library: Download krak/lex 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/ */

krak / lex example snippets




unction Krak\Lex\lexer,
    Krak\Lex\skipLexer;

const TOK_INT = 'int';
const TOK_PLUS = 'plus';
const TOK_MINUS = 'minus';
const TOK_WS = 'whitespace';

// creates a lexer that will use these RE's to match input
// the A (anchor flag) is x the input and return an iterator of tokens
$toks = $lex('1 + 2 - 3');

foreach ($toks as $matched_tok) {
    printf(
        "Matched token '%s' with input '%s' at offset %d\n",
        $matched_tok->token,
        $matched_tok->match,
        $matched_tok->offset
    );
}




use function Krak\Lex\lexer,
    Krak\Lex\tokenStreamLexer;

$lex = lexer(['/a/A' => 'a', '/b/A' => 'b']);
$lex = tokenStreamLexer($lex);
$stream = $lex('aba');

assert($stream->peek() == 'a');
assert($stream->getToken() == 'a');
assert($stream->getToken() == 'b');
assert($stream->getToken() == 'a');
assert($stream->isEmpty());