The Parle\Lexer class

(PECL parle >= 0.5.1)

Einführung

Single state lexer class. Lexemes can be defined on the fly. If the particular lexer instance is meant to be used with Parle\Parser, the token IDs need to be taken from there. Otherwise, arbitrary token IDs can be supplied. This lexer can give a certain performance advantage over Parle\RLexer, if no multiple states are required. Note, that Parle\RParser is not compatible with this lexer.

Klassenbeschreibung

class Parle\Lexer {

/* Konstanten */

const int ICASE = 1;

const int DOT_NOT_LF = 2;

const int DOT_NOT_CRLF = 4;

const int SKIP_WS = 8;

const int MATCH_ZERO_LEN = 16;

/* Eigenschaften */

public bool $bol = false;

public int $flags = 0;

public int $state = 0;

public int $marker = 0;

public int $cursor = 0;

/* Methoden */

public function advance(): void

public function build(): void

public function callout(int $id, callable $callback): void

public function consume(string $data): void

public function dump(): void

public function getToken(): Parle\Token

public function insertMacro(string $name, string $regex): void

public function push(string $regex, int $id): void

public function reset(int $pos): void

}

Vordefinierte Konstanten

Parle\Lexer::ICASE
Parle\Lexer::DOT_NOT_LF
Parle\Lexer::DOT_NOT_CRLF
Parle\Lexer::SKIP_WS
Parle\Lexer::MATCH_ZERO_LEN

Eigenschaften

bol: Start of input flag.
flags: Lexer flags.
state: Current lexer state, readonly.
marker: Position of the latest token match, readonly.
cursor: Current input offset, readonly.

Inhaltsverzeichnis

Parle\Lexer::advance — Process next lexer rule
Parle\Lexer::build — Finalize the lexer rule set
Parle\Lexer::callout — Define token callback
Parle\Lexer::consume — Pass the data for processing
Parle\Lexer::dump — Dump the state machine
Parle\Lexer::getToken — Retrieve the current token
Parle\Lexer::insertMacro — Insert regex macro
Parle\Lexer::push — Add a lexer rule
Parle\Lexer::reset — Reset lexer

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