mirror of https://github.com/vitalif/lime
42 lines
977 B
PHP
42 lines
977 B
PHP
<?php
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/**
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* Let's face it: PHP is not up to lexical processing. GNU flex handles
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* it well, so I've created a little protocol for delegating the work.
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* Extend this class so that executable() gives a path to your lexical
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* analyser program.
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*/
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abstract class flex_scanner {
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abstract function executable();
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public function __construct($path) {
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if (!is_readable($path)) {
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throw new Exception("$path is not readable.");
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}
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putenv("PHP_LIME_SCAN_STDIN=$path");
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$scanner = $this->executable();
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$tokens = explode("\0", `$scanner < "\$PHP_LIME_SCAN_STDIN"`);
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array_pop($tokens);
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$this->tokens = $tokens;
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$this->lineno = 1;
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}
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public function next() {
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if (list($key, $token) = each($this->tokens)) {
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list($this->lineno, $type, $text) = explode("\1", $token);
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return array($type, $text);
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}
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}
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public function feed($parser) {
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while (list($type, $text) = $this->next()) {
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$parser->eat($type, $text);
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}
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return $parser->eat_eof();
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}
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}
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