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Introduction ============ Doctrine Lexer is a library that can be used in Top-Down, Recursive Descent Parsers. This lexer is used in Doctrine Annotations and in Doctrine ORM (DQL). To write your own parser you just need to extend ``Doctrine\Common\Lexer\AbstractLexer`` and implement the following three abstract methods. .. code-block:: php /** * Lexical catchable patterns. * * @return array / abstract protected function getCatchablePatterns(); /* * Lexical non-catchable patterns. * * @return array / abstract protected function getNonCatchablePatterns(); /* * Retrieve token type. Also processes the token value if necessary. * * @param string $value * @return integer */ abstract protected function getType(&$value); These methods define the `lexical <http://en.wikipedia.org/wiki/Lexical_analysis>`_ catchable and non-catchable patterns and a method for returning the type of a token and filtering the value if necessary. The Lexer is responsible for giving you an API to walk across a string one character at a time and analyze the type of each character, value and position of each token in the string. The low level API of the lexer is pretty simple: - ``setInput($input)`` - Sets the input data to be tokenized. The Lexer is immediately reset and the new input tokenized. - ``reset()`` - Resets the lexer. - ``resetPeek()`` - Resets the peek pointer to 0. - ``resetPosition($position = 0)`` - Resets the lexer position on the input to the given position. - ``isNextToken($token)`` - Checks whether a given token matches the current lookahead. - ``isNextTokenAny(array $tokens)`` - Checks whether any of the given tokens matches the current lookahead. - ``moveNext()`` - Moves to the next token in the input string. - ``skipUntil($type)`` - Tells the lexer to skip input tokens until it sees a token with the given value. - ``isA($value, $token)`` - Checks if given value is identical to the given token. - ``peek()`` - Moves the lookahead token forward. - ``glimpse()`` - Peeks at the next token, returns it and immediately resets the peek. Back

Edit File : index.rst | Size : 2.10 KB

Introduction
============

Doctrine Lexer is a library that can be used in Top-Down, Recursive
Descent Parsers. This lexer is used in Doctrine Annotations and in
Doctrine ORM (DQL).

To write your own parser you just need to extend ``Doctrine\Common\Lexer\AbstractLexer``
and implement the following three abstract methods.

.. code-block:: php

/**
     * Lexical catchable patterns.
     *
     * @return array
     */
    abstract protected function getCatchablePatterns();

/**
     * Lexical non-catchable patterns.
     *
     * @return array
     */
    abstract protected function getNonCatchablePatterns();

/**
     * Retrieve token type. Also processes the token value if necessary.
     *
     * @param string $value
     * @return integer
     */
    abstract protected function getType(&$value);

These methods define the `lexical <http://en.wikipedia.org/wiki/Lexical_analysis>`_
catchable and non-catchable patterns and a method for returning the
type of a token and filtering the value if necessary.

The Lexer is responsible for giving you an API to walk across a
string one character at a time and analyze the type of each character, value and position of
each token in the string. The low level API of the lexer is pretty simple:

- ``setInput($input)`` - Sets the input data to be tokenized. The Lexer is immediately reset and the new input tokenized.
- ``reset()`` - Resets the lexer.
- ``resetPeek()`` - Resets the peek pointer to 0.
- ``resetPosition($position = 0)`` - Resets the lexer position on the input to the given position.
- ``isNextToken($token)`` - Checks whether a given token matches the current lookahead.
- ``isNextTokenAny(array $tokens)`` - Checks whether any of the given tokens matches the current lookahead.
- ``moveNext()`` - Moves to the next token in the input string.
- ``skipUntil($type)`` - Tells the lexer to skip input tokens until it sees a token with the given value.
- ``isA($value, $token)`` - Checks if given value is identical to the given token.
- ``peek()`` - Moves the lookahead token forward.
- ``glimpse()`` - Peeks at the next token, returns it and immediately resets the peek.

Back