README

实现php-extended/php-lexer-interface接口库的库。

安装

此库的安装通过composer进行，所有类的自动加载通过它们的自动加载器完成。

• 从他们的网站下载composer.phar。
• 然后运行以下命令以将此库作为依赖项安装
• php composer.phar php-extended/php-lexer-object ^7

基本用法

例如，要创建一个解析数字的词法分析器，您应该执行以下操作：（这将解析等价于正则表达式 ^\d+.\d+$；忽略流中可能存在的所有“垃圾”字符（垃圾 = 既不是点也不是数字）

use PhpExtended\Lexer\LexerInterface;
use PhpExtended\Lexer\LexerFactory;
use PhpExtended\Lexer\LexerConfiguration;

class CONSTS {
	const DIGIT = 1;
	const DOT   = 2;
	const DIGITWDOT = 3;
	const DIGITWTRAIL = 4;
}

$factory = new LexerFactory();
$config = new LexerConfiguration();
// parses all digits as class digit
$config->addMappings(LexerInterface::CLASS_DIGIT, CONSTS::DIGIT);
// parses all dots as class dot
$config->addMappings('.', CONSTS::DOT);
// a digit followed by a digit is still a digit
$config->addMerging(CONSTS::DIGIT, CONSTS::DIGIT, CONSTS::DIGIT);
// a digit followed by a dot is a digit-dot complex
$config->addMerging(CONSTS::DIGIT, CONSTS::DOT, CONSTS::DIGITWDOT);
// a digit-dot complex followed by a digit is a digit-with-trail complex
$config->addMerging(CONSTS::DIGITWDOT, CONSTS::DIGIT, CONSTS::DIGITWTRAIL);
// a digit-with-trail complex followed by a digit is still a digit-with-trail
$config->addMerging(CONSTS::DIGITWTRAIL, CONSTS::DIGIT, CONSTS::DIGITWTRAIL);

$data = '04972ifp.fhsà9300fd'; // the data 04972.9300 is hidden here
$lexer = $factory->createFromString($data, $config);
foreach($lexer as $lexeme)
{
	echo "\t".$lexeme."\n";
//        Code :   1      Line :   1      Column :   0    Data : 04972
//        Code :  -2      Line :   1      Column :   5    Data : ifp
//        Code :   2      Line :   1      Column :   8    Data : .
//        Code :  -2      Line :   1      Column :   9    Data : fhsà
//        Code :   1      Line :   1      Column :  14    Data : 9300
//        Code :  -2      Line :   1      Column :  18    Data : fd
}

$lexer = new CodeFilterLexer($lexer);
foreach($lexer as $lexeme)
{
	echo "\t".$lexeme."\n";
//        Code :   1      Line :   1      Column :   0    Data : 04972
//        Code :   2      Line :   1      Column :   8    Data : .
//        Code :   1      Line :   1      Column :  14    Data : 9300

}

$lexer = new LexerLexer($lexer, $config);
foreach($lexer as $lexeme)
{
	echo "\t".$lexeme."\n";
//        Code :   4      Line :   1      Column :   0    Data : 04972.9300
}

许可证

MIT（见许可证文件）。