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Edit File : simple-parser-example.rst \| Size : 2.55 KB
Simple Parser Example ===================== Extend the ``Doctrine\Common\Lexer\AbstractLexer`` class and implement the ``getCatchablePatterns``, ``getNonCatchablePatterns``, and ``getType`` methods. Here is a very simple example lexer implementation named ``CharacterTypeLexer``. It tokenizes a string to ``T_UPPER``, ``T_LOWER`` and``T_NUMBER`` tokens: .. code-block:: php <?php use Doctrine\Common\Lexer\AbstractLexer; class CharacterTypeLexer extends AbstractLexer { const T_UPPER = 1; const T_LOWER = 2; const T_NUMBER = 3; protected function getCatchablePatterns() { return array( '[a-bA-Z0-9]', ); } protected function getNonCatchablePatterns() { return array(); } protected function getType(&$value) { if (is_numeric($value)) { return self::T_NUMBER; } if (strtoupper($value) === $value) { return self::T_UPPER; } if (strtolower($value) === $value) { return self::T_LOWER; } } } Use ``CharacterTypeLexer`` to extract an array of upper case characters: .. code-block:: php <?php class UpperCaseCharacterExtracter { private $lexer; public function __construct(CharacterTypeLexer $lexer) { $this->lexer = $lexer; } public function getUpperCaseCharacters($string) { $this->lexer->setInput($string); $this->lexer->moveNext(); $upperCaseChars = array(); while (true) { if (!$this->lexer->lookahead) { break; } $this->lexer->moveNext(); if ($this->lexer->token['type'] === CharacterTypeLexer::T_UPPER) { $upperCaseChars[] = $this->lexer->token['value']; } } return $upperCaseChars; } } $upperCaseCharacterExtractor = new UpperCaseCharacterExtracter(new CharacterTypeLexer()); $upperCaseCharacters = $upperCaseCharacterExtractor->getUpperCaseCharacters('1aBcdEfgHiJ12'); print_r($upperCaseCharacters); The variable ``$upperCaseCharacters`` contains all of the upper case characters: .. code-block:: php Array ( [0] => B [1] => E [2] => H [3] => J ) This is a simple example but it should demonstrate the low level API that can be used to build more complex parsers. Back

Edit File : simple-parser-example.rst | Size : 2.55 KB

Simple Parser Example
=====================

Extend the ``Doctrine\Common\Lexer\AbstractLexer`` class and implement
the ``getCatchablePatterns``, ``getNonCatchablePatterns``, and ``getType``
methods. Here is a very simple example lexer implementation named ``CharacterTypeLexer``.
It tokenizes a string to ``T_UPPER``, ``T_LOWER`` and``T_NUMBER`` tokens:

.. code-block:: php
    <?php

use Doctrine\Common\Lexer\AbstractLexer;

class CharacterTypeLexer extends AbstractLexer
    {
        const T_UPPER =  1;
        const T_LOWER =  2;
        const T_NUMBER = 3;

protected function getCatchablePatterns()
        {
            return array(
                '[a-bA-Z0-9]',
            );
        }

protected function getNonCatchablePatterns()
        {
            return array();
        }

protected function getType(&$value)
        {
            if (is_numeric($value)) {
                return self::T_NUMBER;
            }

if (strtoupper($value) === $value) {
                return self::T_UPPER;
            }

if (strtolower($value) === $value) {
                return self::T_LOWER;
            }
        }
    }

Use ``CharacterTypeLexer`` to extract an array of upper case characters:

.. code-block:: php
    <?php

class UpperCaseCharacterExtracter
    {
        private $lexer;

public function __construct(CharacterTypeLexer $lexer)
        {
            $this->lexer = $lexer;
        }

public function getUpperCaseCharacters($string)
        {
            $this->lexer->setInput($string);
            $this->lexer->moveNext();

$upperCaseChars = array();
            while (true) {
                if (!$this->lexer->lookahead) {
                    break;
                }

$this->lexer->moveNext();

if ($this->lexer->token['type'] === CharacterTypeLexer::T_UPPER) {
                    $upperCaseChars[] = $this->lexer->token['value'];
                }
            }

return $upperCaseChars;
        }
    }

$upperCaseCharacterExtractor = new UpperCaseCharacterExtracter(new CharacterTypeLexer());
    $upperCaseCharacters = $upperCaseCharacterExtractor->getUpperCaseCharacters('1aBcdEfgHiJ12');

print_r($upperCaseCharacters);

The variable ``$upperCaseCharacters`` contains all of the upper case
characters:

.. code-block:: php
    Array
    (
        [0] => B
        [1] => E
        [2] => H
        [3] => J
    )

This is a simple example but it should demonstrate the low level API
that can be used to build more complex parsers.

Back