--- /dev/null
+<?php
+
+namespace PhpParser;
+
+use PhpParser\Parser\Tokens;
+
+class Lexer
+{
+ protected $code;
+ protected $tokens;
+ protected $pos;
+ protected $line;
+ protected $filePos;
+ protected $prevCloseTagHasNewline;
+
+ 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, T_COMMENT, T_DOC_COMMENT), 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.
+ *
+ * This function does not throw if lexing errors occur. Instead, errors may be retrieved using
+ * the getErrors() method.
+ *
+ * @param string $code The source code to lex
+ * @param ErrorHandler|null $errorHandler Error handler to use for lexing errors. Defaults to
+ * ErrorHandler\Throwing
+ */
+ public function startLexing($code, ErrorHandler $errorHandler = null) {
+ if (null === $errorHandler) {
+ $errorHandler = new ErrorHandler\Throwing();
+ }
+
+ $this->code = $code; // keep the code around for __halt_compiler() handling
+ $this->pos = -1;
+ $this->line = 1;
+ $this->filePos = 0;
+
+ // If inline HTML occurs without preceding code, treat it as if it had a leading newline.
+ // This ensures proper composability, because having a newline is the "safe" assumption.
+ $this->prevCloseTagHasNewline = true;
+
+ $scream = ini_set('xdebug.scream', '0');
+
+ $this->resetErrors();
+ $this->tokens = @token_get_all($code);
+ $this->handleErrors($errorHandler);
+
+ if (false !== $scream) {
+ ini_set('xdebug.scream', $scream);
+ }
+ }
+
+ protected function resetErrors() {
+ if (function_exists('error_clear_last')) {
+ error_clear_last();
+ } else {
+ // set error_get_last() to defined state by forcing an undefined variable error
+ set_error_handler(function() { return false; }, 0);
+ @$undefinedVariable;
+ restore_error_handler();
+ }
+ }
+
+ private function handleInvalidCharacterRange($start, $end, $line, ErrorHandler $errorHandler) {
+ for ($i = $start; $i < $end; $i++) {
+ $chr = $this->code[$i];
+ if ($chr === 'b' || $chr === 'B') {
+ // HHVM does not treat b" tokens correctly, so ignore these
+ continue;
+ }
+
+ if ($chr === "\0") {
+ // PHP cuts error message after null byte, so need special case
+ $errorMsg = 'Unexpected null byte';
+ } else {
+ $errorMsg = sprintf(
+ 'Unexpected character "%s" (ASCII %d)', $chr, ord($chr)
+ );
+ }
+
+ $errorHandler->handleError(new Error($errorMsg, [
+ 'startLine' => $line,
+ 'endLine' => $line,
+ 'startFilePos' => $i,
+ 'endFilePos' => $i,
+ ]));
+ }
+ }
+
+ private function isUnterminatedComment($token) {
+ return ($token[0] === T_COMMENT || $token[0] === T_DOC_COMMENT)
+ && substr($token[1], 0, 2) === '/*'
+ && substr($token[1], -2) !== '*/';
+ }
+
+ private function errorMayHaveOccurred() {
+ if (defined('HHVM_VERSION')) {
+ // In HHVM token_get_all() does not throw warnings, so we need to conservatively
+ // assume that an error occurred
+ return true;
+ }
+
+ $error = error_get_last();
+ return null !== $error
+ && false === strpos($error['message'], 'Undefined variable');
+ }
+
+ protected function handleErrors(ErrorHandler $errorHandler) {
+ if (!$this->errorMayHaveOccurred()) {
+ return;
+ }
+
+ // PHP's error handling for token_get_all() is rather bad, so if we want detailed
+ // error information we need to compute it ourselves. Invalid character errors are
+ // detected by finding "gaps" in the token array. Unterminated comments are detected
+ // by checking if a trailing comment has a "*/" at the end.
+
+ $filePos = 0;
+ $line = 1;
+ foreach ($this->tokens as $i => $token) {
+ $tokenValue = \is_string($token) ? $token : $token[1];
+ $tokenLen = \strlen($tokenValue);
+
+ if (substr($this->code, $filePos, $tokenLen) !== $tokenValue) {
+ // Something is missing, must be an invalid character
+ $nextFilePos = strpos($this->code, $tokenValue, $filePos);
+ $this->handleInvalidCharacterRange(
+ $filePos, $nextFilePos, $line, $errorHandler);
+ $filePos = $nextFilePos;
+ }
+
+ $filePos += $tokenLen;
+ $line += substr_count($tokenValue, "\n");
+ }
+
+ if ($filePos !== \strlen($this->code)) {
+ if (substr($this->code, $filePos, 2) === '/*') {
+ // Unlike PHP, HHVM will drop unterminated comments entirely
+ $comment = substr($this->code, $filePos);
+ $errorHandler->handleError(new Error('Unterminated comment', [
+ 'startLine' => $line,
+ 'endLine' => $line + substr_count($comment, "\n"),
+ 'startFilePos' => $filePos,
+ 'endFilePos' => $filePos + \strlen($comment),
+ ]));
+
+ // Emulate the PHP behavior
+ $isDocComment = isset($comment[3]) && $comment[3] === '*';
+ $this->tokens[] = [$isDocComment ? T_DOC_COMMENT : T_COMMENT, $comment, $line];
+ } else {
+ // Invalid characters at the end of the input
+ $this->handleInvalidCharacterRange(
+ $filePos, \strlen($this->code), $line, $errorHandler);
+ }
+ return;
+ }
+
+ // Check for unterminated comment
+ $lastToken = $this->tokens[count($this->tokens) - 1];
+ if ($this->isUnterminatedComment($lastToken)) {
+ $errorHandler->handleError(new Error('Unterminated comment', [
+ 'startLine' => $line - substr_count($lastToken[1], "\n"),
+ 'endLine' => $line,
+ 'startFilePos' => $filePos - \strlen($lastToken[1]),
+ 'endFilePos' => $filePos,
+ ]));
+ }
+ }
+
+ /**
+ * 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['startLine'])) {
+ $startAttributes['startLine'] = $this->line;
+ }
+ if (isset($this->usedAttributes['startTokenPos'])) {
+ $startAttributes['startTokenPos'] = $this->pos;
+ }
+ if (isset($this->usedAttributes['startFilePos'])) {
+ $startAttributes['startFilePos'] = $this->filePos;
+ }
+
+ if (\is_string($token)) {
+ $value = $token;
+ if (isset($token[1])) {
+ // bug in token_get_all
+ $this->filePos += 2;
+ $id = ord('"');
+ } else {
+ $this->filePos += 1;
+ $id = ord($token);
+ }
+ } elseif (!isset($this->dropTokens[$token[0]])) {
+ $value = $token[1];
+ $id = $this->tokenMap[$token[0]];
+ if (T_CLOSE_TAG === $token[0]) {
+ $this->prevCloseTagHasNewline = false !== strpos($token[1], "\n");
+ } else if (T_INLINE_HTML === $token[0]) {
+ $startAttributes['hasLeadingNewline'] = $this->prevCloseTagHasNewline;
+ }
+
+ $this->line += substr_count($value, "\n");
+ $this->filePos += \strlen($value);
+ } else {
+ if (T_COMMENT === $token[0] || T_DOC_COMMENT === $token[0]) {
+ if (isset($this->usedAttributes['comments'])) {
+ $comment = T_DOC_COMMENT === $token[0]
+ ? new Comment\Doc($token[1], $this->line, $this->filePos)
+ : new Comment($token[1], $this->line, $this->filePos);
+ $startAttributes['comments'][] = $comment;
+ }
+ }
+
+ $this->line += substr_count($token[1], "\n");
+ $this->filePos += \strlen($token[1]);
+ continue;
+ }
+
+ 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;
+ }
+
+ 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] = Tokens::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] = Tokens::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] = Tokens::T_INLINE_HTML;
+ } else if (defined($name = 'PhpParser\Parser\Tokens::' . $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] = Tokens::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] = Tokens::T_STRING;
+ }
+
+ return $tokenMap;
+ }
+}
projects / yaffs-website / blobdiff