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<?php
/**
* Quickie parser class that can happily read the subset of PHP we need
* for our localization arrays safely.
*
* Still an order of magnitude slower than eval().
*/
class QuickArrayReader {
private $vars = array();
/**
* @param $string string
*/
function __construct( $string ) {
$scalarTypes = array(
T_LNUMBER => true,
T_DNUMBER => true,
T_STRING => true,
T_CONSTANT_ENCAPSED_STRING => true,
);
$skipTypes = array(
T_WHITESPACE => true,
T_COMMENT => true,
T_DOC_COMMENT => true,
);
$tokens = token_get_all( $string );
$count = count( $tokens );
for ( $i = 0; $i < $count; ) {
while ( isset( $skipTypes[$tokens[$i][0]] ) ) {
$i++;
}
switch ( $tokens[$i][0] ) {
case T_OPEN_TAG:
$i++;
continue;
case T_VARIABLE:
// '$messages' -> 'messages'
$varname = trim( substr( $tokens[$i][1], 1 ) );
$varindex = null;
while ( isset( $skipTypes[$tokens[++$i][0]] ) );
if ( $tokens[$i] === '[' ) {
while ( isset( $skipTypes[$tokens[++$i][0]] ) );
if ( isset( $scalarTypes[$tokens[$i][0]] ) ) {
$varindex = $this->parseScalar( $tokens[$i] );
} else {
throw $this->except( $tokens[$i], 'scalar index' );
}
while ( isset( $skipTypes[$tokens[++$i][0]] ) );
if ( $tokens[$i] !== ']' ) {
throw $this->except( $tokens[$i], ']' );
}
while ( isset( $skipTypes[$tokens[++$i][0]] ) );
}
if ( $tokens[$i] !== '=' ) {
throw $this->except( $tokens[$i], '=' );
}
while ( isset( $skipTypes[$tokens[++$i][0]] ) );
if ( isset( $scalarTypes[$tokens[$i][0]] ) ) {
$buildval = $this->parseScalar( $tokens[$i] );
} elseif ( $tokens[$i][0] === T_ARRAY ) {
while ( isset( $skipTypes[$tokens[++$i][0]] ) );
if ( $tokens[$i] !== '(' ) {
throw $this->except( $tokens[$i], '(' );
}
$buildval = array();
do {
while ( isset( $skipTypes[$tokens[++$i][0]] ) );
if ( $tokens[$i] === ')' ) {
break;
}
if ( isset( $scalarTypes[$tokens[$i][0]] ) ) {
$key = $this->parseScalar( $tokens[$i] );
}
while ( isset( $skipTypes[$tokens[++$i][0]] ) );
if ( $tokens[$i][0] !== T_DOUBLE_ARROW ) {
throw $this->except( $tokens[$i], '=>' );
}
while ( isset( $skipTypes[$tokens[++$i][0]] ) );
if ( isset( $scalarTypes[$tokens[$i][0]] ) ) {
$val = $this->parseScalar( $tokens[$i] );
}
wfSuppressWarnings();
$buildval[$key] = $val;
wfRestoreWarnings();
while ( isset( $skipTypes[$tokens[++$i][0]] ) );
if ( $tokens[$i] === ',' ) {
continue;
} elseif ( $tokens[$i] === ')' ) {
break;
} else {
throw $this->except( $tokens[$i], ', or )' );
}
} while ( true );
} else {
throw $this->except( $tokens[$i], 'scalar or array' );
}
if ( is_null( $varindex ) ) {
$this->vars[$varname] = $buildval;
} else {
wfSuppressWarnings();
$this->vars[$varname][$varindex] = $buildval;
wfRestoreWarnings();
}
while ( isset( $skipTypes[$tokens[++$i][0]] ) );
if ( $tokens[$i] !== ';' ) {
throw $this->except( $tokens[$i], ';' );
}
$i++;
break;
default:
throw $this->except( $tokens[$i], 'open tag, whitespace, or variable.' );
}
}
}
/**
* @param $got string
* @param $expected string
* @return Exception
*/
private function except( $got, $expected ) {
if ( is_array( $got ) ) {
$got = token_name( $got[0] ) . " ('" . $got[1] . "')";
} else {
$got = "'" . $got . "'";
}
return new Exception( "Expected $expected, got $got" );
}
/**
* Parse a scalar value in PHP
*
* @param $token string
*
* @return mixed Parsed value
*/
function parseScalar( $token ) {
if ( is_array( $token ) ) {
$str = $token[1];
} else {
$str = $token;
}
if ( $str !== '' && $str[0] == '\'' ) {
// Single-quoted string
// @fixme trim() call is due to mystery bug where whitespace gets
// appended to the token; without it we ended up reading in the
// extra quote on the end!
return strtr( substr( trim( $str ), 1, -1 ),
array( '\\\'' => '\'', '\\\\' => '\\' ) );
}
wfSuppressWarnings();
if ( $str !== '' && $str[0] == '"' ) {
// Double-quoted string
// @fixme trim() call is due to mystery bug where whitespace gets
// appended to the token; without it we ended up reading in the
// extra quote on the end!
wfRestoreWarnings();
return stripcslashes( substr( trim( $str ), 1, -1 ) );
}
wfRestoreWarnings();
if ( substr( $str, 0, 4 ) === 'true' ) {
return true;
}
if ( substr( $str, 0, 5 ) === 'false' ) {
return false;
}
if ( substr( $str, 0, 4 ) === 'null' ) {
return null;
}
// Must be some kind of numeric value, so let PHP's weak typing
// be useful for a change
return $str;
}
/**
* @param $varname string
* @return null|string
*/
function getVar( $varname ) {
if ( isset( $this->vars[$varname] ) ) {
return $this->vars[$varname];
} else {
return null;
}
}
}
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