mirror of
https://github.com/phabelio/PHP-Parser.git
synced 2024-11-30 04:29:15 +01:00
287 lines
11 KiB
PHP
287 lines
11 KiB
PHP
<?php
|
|
|
|
namespace PhpParser;
|
|
|
|
class Lexer
|
|
{
|
|
protected $code;
|
|
protected $tokens;
|
|
protected $pos;
|
|
protected $line;
|
|
protected $filePos;
|
|
|
|
protected $tokenMap;
|
|
protected $dropTokens;
|
|
|
|
protected $usedAttributes;
|
|
|
|
/**
|
|
* Creates a Lexer.
|
|
*
|
|
* @param array $options Options array. Currently only the 'usedAttributes' option is supported,
|
|
* which is an array of attributes to add to the AST nodes. Possible attributes
|
|
* are: 'comments', 'startLine', 'endLine', 'startTokenPos', 'endTokenPos',
|
|
* 'startFilePos', 'endFilePos'. The option defaults to the first three.
|
|
* For more info see getNextToken() docs.
|
|
*/
|
|
public function __construct(array $options = array()) {
|
|
// map from internal tokens to PhpParser tokens
|
|
$this->tokenMap = $this->createTokenMap();
|
|
|
|
// map of tokens to drop while lexing (the map is only used for isset lookup,
|
|
// that's why the value is simply set to 1; the value is never actually used.)
|
|
$this->dropTokens = array_fill_keys(array(T_WHITESPACE, T_OPEN_TAG), 1);
|
|
|
|
// the usedAttributes member is a map of the used attribute names to a dummy
|
|
// value (here "true")
|
|
$options += array(
|
|
'usedAttributes' => array('comments', 'startLine', 'endLine'),
|
|
);
|
|
$this->usedAttributes = array_fill_keys($options['usedAttributes'], true);
|
|
}
|
|
|
|
/**
|
|
* Initializes the lexer for lexing the provided source code.
|
|
*
|
|
* @param string $code The source code to lex
|
|
*
|
|
* @throws Error on lexing errors (unterminated comment or unexpected character)
|
|
*/
|
|
public function startLexing($code) {
|
|
$scream = ini_set('xdebug.scream', '0');
|
|
|
|
$this->resetErrors();
|
|
$this->tokens = @token_get_all($code);
|
|
$this->handleErrors();
|
|
|
|
if (false !== $scream) {
|
|
ini_set('xdebug.scream', $scream);
|
|
}
|
|
|
|
$this->code = $code; // keep the code around for __halt_compiler() handling
|
|
$this->pos = -1;
|
|
$this->line = 1;
|
|
$this->filePos = 0;
|
|
}
|
|
|
|
protected function resetErrors() {
|
|
// set error_get_last() to defined state by forcing an undefined variable error
|
|
set_error_handler(function() { return false; }, 0);
|
|
@$undefinedVariable;
|
|
restore_error_handler();
|
|
}
|
|
|
|
protected function handleErrors() {
|
|
$error = error_get_last();
|
|
|
|
if (preg_match(
|
|
'~^Unterminated comment starting line ([0-9]+)$~',
|
|
$error['message'], $matches
|
|
)) {
|
|
throw new Error('Unterminated comment', (int) $matches[1]);
|
|
}
|
|
|
|
if (preg_match(
|
|
'~^Unexpected character in input: \'(.)\' \(ASCII=([0-9]+)\)~s',
|
|
$error['message'], $matches
|
|
)) {
|
|
throw new Error(sprintf(
|
|
'Unexpected character "%s" (ASCII %d)',
|
|
$matches[1], $matches[2]
|
|
));
|
|
}
|
|
|
|
// PHP cuts error message after null byte, so need special case
|
|
if (preg_match('~^Unexpected character in input: \'$~', $error['message'])) {
|
|
throw new Error('Unexpected null byte');
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Fetches the next token.
|
|
*
|
|
* The available attributes are determined by the 'usedAttributes' option, which can
|
|
* be specified in the constructor. The following attributes are supported:
|
|
*
|
|
* * 'comments' => Array of PhpParser\Comment or PhpParser\Comment\Doc instances,
|
|
* representing all comments that occurred between the previous
|
|
* non-discarded token and the current one.
|
|
* * 'startLine' => Line in which the node starts.
|
|
* * 'endLine' => Line in which the node ends.
|
|
* * 'startTokenPos' => Offset into the token array of the first token in the node.
|
|
* * 'endTokenPos' => Offset into the token array of the last token in the node.
|
|
* * 'startFilePos' => Offset into the code string of the first character that is part of the node.
|
|
* * 'endFilePos' => Offset into the code string of the last character that is part of the node
|
|
*
|
|
* @param mixed $value Variable to store token content in
|
|
* @param mixed $startAttributes Variable to store start attributes in
|
|
* @param mixed $endAttributes Variable to store end attributes in
|
|
*
|
|
* @return int Token id
|
|
*/
|
|
public function getNextToken(&$value = null, &$startAttributes = null, &$endAttributes = null) {
|
|
$startAttributes = array();
|
|
$endAttributes = array();
|
|
|
|
while (1) {
|
|
if (isset($this->tokens[++$this->pos])) {
|
|
$token = $this->tokens[$this->pos];
|
|
} else {
|
|
// EOF token with ID 0
|
|
$token = "\0";
|
|
}
|
|
|
|
if (isset($this->usedAttributes['startTokenPos'])) {
|
|
$startAttributes['startTokenPos'] = $this->pos;
|
|
}
|
|
if (isset($this->usedAttributes['startFilePos'])) {
|
|
$startAttributes['startFilePos'] = $this->filePos;
|
|
}
|
|
|
|
if (is_string($token)) {
|
|
// bug in token_get_all
|
|
if ('b"' === $token) {
|
|
$value = 'b"';
|
|
$this->filePos += 2;
|
|
$id = ord('"');
|
|
} else {
|
|
$value = $token;
|
|
$this->filePos += 1;
|
|
$id = ord($token);
|
|
}
|
|
|
|
if (isset($this->usedAttributes['startLine'])) {
|
|
$startAttributes['startLine'] = $this->line;
|
|
}
|
|
if (isset($this->usedAttributes['endLine'])) {
|
|
$endAttributes['endLine'] = $this->line;
|
|
}
|
|
if (isset($this->usedAttributes['endTokenPos'])) {
|
|
$endAttributes['endTokenPos'] = $this->pos;
|
|
}
|
|
if (isset($this->usedAttributes['endFilePos'])) {
|
|
$endAttributes['endFilePos'] = $this->filePos - 1;
|
|
}
|
|
|
|
return $id;
|
|
} else {
|
|
$this->line += substr_count($token[1], "\n");
|
|
$this->filePos += strlen($token[1]);
|
|
|
|
if (T_COMMENT === $token[0]) {
|
|
if (isset($this->usedAttributes['comments'])) {
|
|
$startAttributes['comments'][] = new Comment($token[1], $token[2]);
|
|
}
|
|
} elseif (T_DOC_COMMENT === $token[0]) {
|
|
if (isset($this->usedAttributes['comments'])) {
|
|
$startAttributes['comments'][] = new Comment\Doc($token[1], $token[2]);
|
|
}
|
|
} elseif (!isset($this->dropTokens[$token[0]])) {
|
|
$value = $token[1];
|
|
|
|
if (isset($this->usedAttributes['startLine'])) {
|
|
$startAttributes['startLine'] = $token[2];
|
|
}
|
|
if (isset($this->usedAttributes['endLine'])) {
|
|
$endAttributes['endLine'] = $this->line;
|
|
}
|
|
if (isset($this->usedAttributes['endTokenPos'])) {
|
|
$endAttributes['endTokenPos'] = $this->pos;
|
|
}
|
|
if (isset($this->usedAttributes['endFilePos'])) {
|
|
$endAttributes['endFilePos'] = $this->filePos - 1;
|
|
}
|
|
|
|
return $this->tokenMap[$token[0]];
|
|
}
|
|
}
|
|
}
|
|
|
|
throw new \RuntimeException('Reached end of lexer loop');
|
|
}
|
|
|
|
/**
|
|
* Returns the token array for current code.
|
|
*
|
|
* The token array is in the same format as provided by the
|
|
* token_get_all() function and does not discard tokens (i.e.
|
|
* whitespace and comments are included). The token position
|
|
* attributes are against this token array.
|
|
*
|
|
* @return array Array of tokens in token_get_all() format
|
|
*/
|
|
public function getTokens() {
|
|
return $this->tokens;
|
|
}
|
|
|
|
/**
|
|
* Handles __halt_compiler() by returning the text after it.
|
|
*
|
|
* @return string Remaining text
|
|
*/
|
|
public function handleHaltCompiler() {
|
|
// text after T_HALT_COMPILER, still including ();
|
|
$textAfter = substr($this->code, $this->filePos);
|
|
|
|
// ensure that it is followed by ();
|
|
// this simplifies the situation, by not allowing any comments
|
|
// in between of the tokens.
|
|
if (!preg_match('~^\s*\(\s*\)\s*(?:;|\?>\r?\n?)~', $textAfter, $matches)) {
|
|
throw new Error('__HALT_COMPILER must be followed by "();"');
|
|
}
|
|
|
|
// prevent the lexer from returning any further tokens
|
|
$this->pos = count($this->tokens);
|
|
|
|
// return with (); removed
|
|
return (string) substr($textAfter, strlen($matches[0])); // (string) converts false to ''
|
|
}
|
|
|
|
/**
|
|
* Creates the token map.
|
|
*
|
|
* The token map maps the PHP internal token identifiers
|
|
* to the identifiers used by the Parser. Additionally it
|
|
* maps T_OPEN_TAG_WITH_ECHO to T_ECHO and T_CLOSE_TAG to ';'.
|
|
*
|
|
* @return array The token map
|
|
*/
|
|
protected function createTokenMap() {
|
|
$tokenMap = array();
|
|
|
|
// 256 is the minimum possible token number, as everything below
|
|
// it is an ASCII value
|
|
for ($i = 256; $i < 1000; ++$i) {
|
|
if (T_DOUBLE_COLON === $i) {
|
|
// T_DOUBLE_COLON is equivalent to T_PAAMAYIM_NEKUDOTAYIM
|
|
$tokenMap[$i] = Parser::T_PAAMAYIM_NEKUDOTAYIM;
|
|
} elseif(T_OPEN_TAG_WITH_ECHO === $i) {
|
|
// T_OPEN_TAG_WITH_ECHO with dropped T_OPEN_TAG results in T_ECHO
|
|
$tokenMap[$i] = Parser::T_ECHO;
|
|
} elseif(T_CLOSE_TAG === $i) {
|
|
// T_CLOSE_TAG is equivalent to ';'
|
|
$tokenMap[$i] = ord(';');
|
|
} elseif ('UNKNOWN' !== $name = token_name($i)) {
|
|
if ('T_HASHBANG' === $name) {
|
|
// HHVM uses a special token for #! hashbang lines
|
|
$tokenMap[$i] = Parser::T_INLINE_HTML;
|
|
} else if (defined($name = 'PhpParser\Parser::' . $name)) {
|
|
// Other tokens can be mapped directly
|
|
$tokenMap[$i] = constant($name);
|
|
}
|
|
}
|
|
}
|
|
|
|
// HHVM uses a special token for numbers that overflow to double
|
|
if (defined('T_ONUMBER')) {
|
|
$tokenMap[T_ONUMBER] = Parser::T_DNUMBER;
|
|
}
|
|
// HHVM also has a separate token for the __COMPILER_HALT_OFFSET__ constant
|
|
if (defined('T_COMPILER_HALT_OFFSET')) {
|
|
$tokenMap[T_COMPILER_HALT_OFFSET] = Parser::T_STRING;
|
|
}
|
|
|
|
return $tokenMap;
|
|
}
|
|
}
|