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    Lexer examples

    例1 Tokenize comma separated integer list

    <?php

    use Parle\Token;
    use     Parle\Lexer;
    use     Parle\LexerException;

    /* name => id */
    $token = array(
    "COMMA" => 1,
    "CRLF" => 2,
    "DECIMAL" => 3,
    );
    /* id => name */
    $tokenIdToName = array_flip($token);

    $lex = new Lexer;
    $lex->push("[\x2c]", $token["COMMA"]);
    $lex->push("[\r][\n]", $token["CRLF"]);
    $lex->push("[\d]+", $token["DECIMAL"]);
    $lex->build();

    $in = "0,1,2\r\n3,42,5\r\n6,77,8\r\n";

    $lex->consume($in);

    do {
    $lex->advance();
    $tok = $lex->getToken();

    if (    Token::UNKNOWN == $tok->id) {
    throw new     LexerException("Unknown token '{$tok->value}' at offset {$lex->marker}.");
    }

    echo     "TOKEN: ", $tokenIdToName[$tok->id], PHP_EOL;
    } while (    Token::EOI != $tok->id);

    例2 Tokenize assign statement

    <?php

    use Parle\{Token, Lexer};

    $lex = new Lexer;

    $lex->push("\$[a-zA-Z_][a-zA-Z0-9_]*", 1);
    $lex->push("=", 2);
    $lex->push("\d+", 3);
    $lex->push(";", 4);

    $lex->build();

    $lex->consume('$x = 42; $y = 24;');


    do {
    $lex->advance();
    $tok = $lex->getToken();
    var_dump($tok);
    } while (    Token::EOI != $tok->id);

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