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Lexer.php
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Tue, Apr 30, 19:58

Lexer.php
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<?php
/*
* This file is part of the JSON Lint package.
*
* (c) Jordi Boggiano <j.boggiano@seld.be>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
/**
* Lexer class
*
* Ported from https://github.com/zaach/jsonlint
*/
class JsonLintLexer
{
private $EOF = 1;
private $rules = array(
0 => '/^\s+/',
1 => '/^-?([0-9]|[1-9][0-9]+)(\.[0-9]+)?([eE][+-]?[0-9]+)?\b/',
2 => '{^"(?:\\\\["bfnrt/\\\\]|\\\\u[a-fA-F0-9]{4}|[^\0-\x09\x0a-\x1f\\\\"]+)*"}',
3 => '/^\{/',
4 => '/^\}/',
5 => '/^\[/',
6 => '/^\]/',
7 => '/^,/',
8 => '/^:/',
9 => '/^true\b/',
10 => '/^false\b/',
11 => '/^null\b/',
12 => '/^$/',
13 => '/^./',
);
private $conditions = array(
"INITIAL" => array(
"rules" => array(0,1,2,3,4,5,6,7,8,9,10,11,12,13),
"inclusive" => true,
),
);
private $conditionStack;
private $input;
private $more;
private $done;
private $matched;
public $match;
public $yylineno;
public $yyleng;
public $yytext;
public $yylloc;
public function lex()
{
$r = $this->next();
if (!$r instanceof JsonLintUndefined) {
return $r;
}
return $this->lex();
}
public function setInput($input)
{
$this->input = $input;
$this->more = false;
$this->done = false;
$this->yylineno = $this->yyleng = 0;
$this->yytext = $this->matched = $this->match = '';
$this->conditionStack = array('INITIAL');
$this->yylloc = array('first_line' => 1, 'first_column' => 0, 'last_line' => 1, 'last_column' => 0);
return $this;
}
public function showPosition()
{
$pre = str_replace("\n", '', $this->getPastInput());
$c = str_repeat('-', max(0, strlen($pre) - 1)); // new Array(pre.length + 1).join("-");
return $pre . str_replace("\n", '', $this->getUpcomingInput()) . "\n" . $c . "^";
}
public function getPastInput()
{
$past = substr($this->matched, 0, strlen($this->matched) - strlen($this->match));
return (strlen($past) > 20 ? '...' : '') . substr($past, -20);
}
public function getUpcomingInput()
{
$next = $this->match;
if (strlen($next) < 20) {
$next .= substr($this->input, 0, 20 - strlen($next));
}
return substr($next, 0, 20) . (strlen($next) > 20 ? '...' : '');
}
protected function parseError($str, $hash)
{
throw new Exception($str);
}
private function next()
{
if ($this->done) {
return $this->EOF;
}
if (!$this->input) {
$this->done = true;
}
$token = null;
$match = null;
$col = null;
$lines = null;
if (!$this->more) {
$this->yytext = '';
$this->match = '';
}
$rules = $this->getCurrentRules();
$rulesLen = count($rules);
for ($i=0; $i < $rulesLen; $i++) {
if (preg_match($this->rules[$rules[$i]], $this->input, $match)) {
preg_match_all('/\n.*/', $match[0], $lines);
$lines = $lines[0];
if ($lines) {
$this->yylineno += count($lines);
}
$this->yylloc = array(
'first_line' => $this->yylloc['last_line'],
'last_line' => $this->yylineno+1,
'first_column' => $this->yylloc['last_column'],
'last_column' => $lines ? strlen($lines[count($lines) - 1]) - 1 : $this->yylloc['last_column'] + strlen($match[0]),
);
$this->yytext .= $match[0];
$this->match .= $match[0];
$this->yyleng = strlen($this->yytext);
$this->more = false;
$this->input = substr($this->input, strlen($match[0]));
$this->matched .= $match[0];
$token = $this->performAction($rules[$i], $this->conditionStack[count($this->conditionStack)-1]);
if ($token) {
return $token;
}
return new JsonLintUndefined();
}
}
if ($this->input === "") {
return $this->EOF;
}
$this->parseError(
'Lexical error on line ' . ($this->yylineno+1) . ". Unrecognized text.\n" . $this->showPosition(),
array(
'text' => "",
'token' => null,
'line' => $this->yylineno,
)
);
}
private function getCurrentRules()
{
return $this->conditions[$this->conditionStack[count($this->conditionStack)-1]]['rules'];
}
private function performAction($avoiding_name_collisions, $YY_START)
{
switch ($avoiding_name_collisions) {
case 0:/* skip whitespace */
break;
case 1:
return 6;
break;
case 2:
$this->yytext = substr($this->yytext, 1, $this->yyleng-2);
return 4;
case 3:
return 17;
case 4:
return 18;
case 5:
return 23;
case 6:
return 24;
case 7:
return 22;
case 8:
return 21;
case 9:
return 10;
case 10:
return 11;
case 11:
return 8;
case 12:
return 14;
case 13:
return 'INVALID';
}
}
}

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