src/scanner.cc - Issue 1481613002: Create ast/ and parsing/ subdirectories and move appropriate files

Unified Diff: src/scanner.cc

Issue 1481613002: Create ast/ and parsing/ subdirectories and move appropriate files (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master

Patch Set: Rebase Created 5 years, 1 month ago

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Index: src/scanner.cc

diff --git a/src/scanner.cc b/src/scanner.cc

deleted file mode 100644

index 3031144b0915ad528b4f7ab1d8ba0ff95f31c980..0000000000000000000000000000000000000000

--- a/src/scanner.cc

+++ /dev/null

@@ -1,1673 +0,0 @@

-// Use of this source code is governed by a BSD-style license that can be

-// found in the LICENSE file.

-// Features shared by parsing and pre-parsing scanners.

-#include "src/scanner.h"

-#include <stdint.h>

-#include <cmath>

-#include "src/ast-value-factory.h"

-#include "src/char-predicates-inl.h"

-#include "src/conversions-inl.h"

-#include "src/list-inl.h"

-#include "src/parser.h"

-namespace v8 {

-namespace internal {

-Handle<String> LiteralBuffer::Internalize(Isolate* isolate) const {

- if (is_one_byte()) {

- return isolate->factory()->InternalizeOneByteString(one_byte_literal());

- }

- return isolate->factory()->InternalizeTwoByteString(two_byte_literal());

-// Default implementation for streams that do not support bookmarks.

-bool Utf16CharacterStream::SetBookmark() { return false; }

-void Utf16CharacterStream::ResetToBookmark() { UNREACHABLE(); }

-// ----------------------------------------------------------------------------

-// Scanner

-Scanner::Scanner(UnicodeCache* unicode_cache)

- : unicode_cache_(unicode_cache),

- bookmark_c0_(kNoBookmark),

- octal_pos_(Location::invalid()) {

- bookmark_current_.literal_chars = &bookmark_current_literal_;

- bookmark_current_.raw_literal_chars = &bookmark_current_raw_literal_;

- bookmark_next_.literal_chars = &bookmark_next_literal_;

- bookmark_next_.raw_literal_chars = &bookmark_next_raw_literal_;

-void Scanner::Initialize(Utf16CharacterStream* source) {

- source_ = source;

- // Need to capture identifiers in order to recognize "get" and "set"

- // in object literals.

- Init();

- // Skip initial whitespace allowing HTML comment ends just like

- // after a newline and scan first token.

- has_line_terminator_before_next_ = true;

- SkipWhiteSpace();

- Scan();

-template <bool capture_raw>

-uc32 Scanner::ScanHexNumber(int expected_length) {

- DCHECK(expected_length <= 4); // prevent overflow

- uc32 x = 0;

- for (int i = 0; i < expected_length; i++) {

- int d = HexValue(c0_);

- if (d < 0) {

- return -1;

- }

- x = x * 16 + d;

- Advance<capture_raw>();

- }

- return x;

-template <bool capture_raw>

-uc32 Scanner::ScanUnlimitedLengthHexNumber(int max_value) {

- uc32 x = 0;

- int d = HexValue(c0_);

- if (d < 0) {

- return -1;

- }

- while (d >= 0) {

- x = x * 16 + d;

- if (x > max_value) return -1;

- Advance<capture_raw>();

- d = HexValue(c0_);

- }

- return x;

-// Ensure that tokens can be stored in a byte.

-STATIC_ASSERT(Token::NUM_TOKENS <= 0x100);

-// Table of one-character tokens, by character (0x00..0x7f only).

-static const byte one_char_tokens[] = {

- Token::ILLEGAL,

- Token::LPAREN, // 0x28

- Token::RPAREN, // 0x29

- Token::ILLEGAL,

- Token::COMMA, // 0x2c

- Token::ILLEGAL,

- Token::COLON, // 0x3a

- Token::SEMICOLON, // 0x3b

- Token::ILLEGAL,

- Token::CONDITIONAL, // 0x3f

- Token::ILLEGAL,

- Token::LBRACK, // 0x5b

- Token::ILLEGAL,

- Token::RBRACK, // 0x5d

- Token::ILLEGAL,

- Token::LBRACE, // 0x7b

- Token::ILLEGAL,

- Token::RBRACE, // 0x7d

- Token::BIT_NOT, // 0x7e

- Token::ILLEGAL

-};

-Token::Value Scanner::Next() {

- if (next_.token == Token::EOS) {

- next_.location.beg_pos = current_.location.beg_pos;

- next_.location.end_pos = current_.location.end_pos;

- }

- current_ = next_;

- if (V8_UNLIKELY(next_next_.token != Token::UNINITIALIZED)) {

- next_ = next_next_;

- next_next_.token = Token::UNINITIALIZED;

- return current_.token;

- }

- has_line_terminator_before_next_ = false;

- has_multiline_comment_before_next_ = false;

- if (static_cast<unsigned>(c0_) <= 0x7f) {

- Token::Value token = static_cast<Token::Value>(one_char_tokens[c0_]);

- if (token != Token::ILLEGAL) {

- int pos = source_pos();

- next_.token = token;

- next_.location.beg_pos = pos;

- next_.location.end_pos = pos + 1;

- Advance();

- return current_.token;

- }

- Scan();

- return current_.token;

-Token::Value Scanner::PeekAhead() {

- if (next_next_.token != Token::UNINITIALIZED) {

- return next_next_.token;

- }

- TokenDesc prev = current_;

- Next();

- Token::Value ret = next_.token;

- next_next_ = next_;

- next_ = current_;

- current_ = prev;

- return ret;

-// TODO(yangguo): check whether this is actually necessary.

-static inline bool IsLittleEndianByteOrderMark(uc32 c) {

- // The Unicode value U+FFFE is guaranteed never to be assigned as a

- // Unicode character; this implies that in a Unicode context the

- // 0xFF, 0xFE byte pattern can only be interpreted as the U+FEFF

- // character expressed in little-endian byte order (since it could

- // not be a U+FFFE character expressed in big-endian byte

- // order). Nevertheless, we check for it to be compatible with

- // Spidermonkey.

- return c == 0xFFFE;

-bool Scanner::SkipWhiteSpace() {

- int start_position = source_pos();

- while (true) {

- // The unicode cache accepts unsigned inputs.

- if (c0_ < 0) break;

- // Advance as long as character is a WhiteSpace or LineTerminator.

- // Remember if the latter is the case.

- if (unicode_cache_->IsLineTerminator(c0_)) {

- has_line_terminator_before_next_ = true;

- } else if (!unicode_cache_->IsWhiteSpace(c0_) &&

- !IsLittleEndianByteOrderMark(c0_)) {

- break;

- }

- Advance();

- }

- // If there is an HTML comment end '-->' at the beginning of a

- // line (with only whitespace in front of it), we treat the rest

- // of the line as a comment. This is in line with the way

- // SpiderMonkey handles it.

- if (c0_ == '-' && has_line_terminator_before_next_) {

- Advance();

- if (c0_ == '-') {

- Advance();

- if (c0_ == '>') {

- // Treat the rest of the line as a comment.

- SkipSingleLineComment();

- // Continue skipping white space after the comment.

- continue;

- }

- PushBack('-'); // undo Advance()

- }

- PushBack('-'); // undo Advance()

- }

- // Return whether or not we skipped any characters.

- return source_pos() != start_position;

- }

-Token::Value Scanner::SkipSingleLineComment() {

- Advance();

- // The line terminator at the end of the line is not considered

- // to be part of the single-line comment; it is recognized

- // separately by the lexical grammar and becomes part of the

- // stream of input elements for the syntactic grammar (see

- // ECMA-262, section 7.4).

- while (c0_ >= 0 && !unicode_cache_->IsLineTerminator(c0_)) {

- Advance();

- }

- return Token::WHITESPACE;

-Token::Value Scanner::SkipSourceURLComment() {

- TryToParseSourceURLComment();

- while (c0_ >= 0 && !unicode_cache_->IsLineTerminator(c0_)) {

- Advance();

- }

- return Token::WHITESPACE;

-void Scanner::TryToParseSourceURLComment() {

- // Magic comments are of the form: //[#@]\s<name>=\s*<value>\s*.* and this

- // function will just return if it cannot parse a magic comment.

- if (c0_ < 0 || !unicode_cache_->IsWhiteSpace(c0_)) return;

- Advance();

- LiteralBuffer name;

- while (c0_ >= 0 && !unicode_cache_->IsWhiteSpaceOrLineTerminator(c0_) &&

- c0_ != '=') {

- name.AddChar(c0_);

- Advance();

- }

- if (!name.is_one_byte()) return;

- Vector<const uint8_t> name_literal = name.one_byte_literal();

- LiteralBuffer* value;

- if (name_literal == STATIC_CHAR_VECTOR("sourceURL")) {

- value = &source_url_;

- } else if (name_literal == STATIC_CHAR_VECTOR("sourceMappingURL")) {

- value = &source_mapping_url_;

- } else {

- return;

- }

- if (c0_ != '=')

- return;

- Advance();

- value->Reset();

- while (c0_ >= 0 && unicode_cache_->IsWhiteSpace(c0_)) {

- Advance();

- }

- while (c0_ >= 0 && !unicode_cache_->IsLineTerminator(c0_)) {

- // Disallowed characters.

- if (c0_ == '"' || c0_ == '\'') {

- value->Reset();

- return;

- }

- if (unicode_cache_->IsWhiteSpace(c0_)) {

- break;

- }

- value->AddChar(c0_);

- Advance();

- }

- // Allow whitespace at the end.

- while (c0_ >= 0 && !unicode_cache_->IsLineTerminator(c0_)) {

- if (!unicode_cache_->IsWhiteSpace(c0_)) {

- value->Reset();

- break;

- }

- Advance();

- }

-Token::Value Scanner::SkipMultiLineComment() {

- DCHECK(c0_ == '*');

- Advance();

- while (c0_ >= 0) {

- uc32 ch = c0_;

- Advance();

- if (c0_ >= 0 && unicode_cache_->IsLineTerminator(ch)) {

- // Following ECMA-262, section 7.4, a comment containing

- // a newline will make the comment count as a line-terminator.

- has_multiline_comment_before_next_ = true;

- }

- // If we have reached the end of the multi-line comment, we

- // consume the '/' and insert a whitespace. This way all

- // multi-line comments are treated as whitespace.

- if (ch == '*' && c0_ == '/') {

- c0_ = ' ';

- return Token::WHITESPACE;

- }

- // Unterminated multi-line comment.

- return Token::ILLEGAL;

-Token::Value Scanner::ScanHtmlComment() {

- // Check for <!-- comments.

- DCHECK(c0_ == '!');

- Advance();

- if (c0_ == '-') {

- Advance();

- if (c0_ == '-') return SkipSingleLineComment();

- PushBack('-'); // undo Advance()

- }

- PushBack('!'); // undo Advance()

- DCHECK(c0_ == '!');

- return Token::LT;

-void Scanner::Scan() {

- next_.literal_chars = NULL;

- next_.raw_literal_chars = NULL;

- Token::Value token;

- do {

- // Remember the position of the next token

- next_.location.beg_pos = source_pos();

- switch (c0_) {

- case ' ':

- case '\t':

- Advance();

- token = Token::WHITESPACE;

- break;

- case '\n':

- Advance();

- has_line_terminator_before_next_ = true;

- token = Token::WHITESPACE;

- break;

- case '"': case '\'':

- token = ScanString();

- break;

- case '<':

- // < <= << <<= <!--

- Advance();

- if (c0_ == '=') {

- token = Select(Token::LTE);

- } else if (c0_ == '<') {

- token = Select('=', Token::ASSIGN_SHL, Token::SHL);

- } else if (c0_ == '!') {

- token = ScanHtmlComment();

- } else {

- token = Token::LT;

- }

- break;

- case '>':

- // > >= >> >>= >>> >>>=

- Advance();

- if (c0_ == '=') {

- token = Select(Token::GTE);

- } else if (c0_ == '>') {

- // >> >>= >>> >>>=

- Advance();

- if (c0_ == '=') {

- token = Select(Token::ASSIGN_SAR);

- } else if (c0_ == '>') {

- token = Select('=', Token::ASSIGN_SHR, Token::SHR);

- } else {

- token = Token::SAR;

- }

- } else {

- token = Token::GT;

- }

- break;

- case '=':

- // = == === =>

- Advance();

- if (c0_ == '=') {

- token = Select('=', Token::EQ_STRICT, Token::EQ);

- } else if (c0_ == '>') {

- token = Select(Token::ARROW);

- } else {

- token = Token::ASSIGN;

- }

- break;

- case '!':

- // ! != !==

- Advance();

- if (c0_ == '=') {

- token = Select('=', Token::NE_STRICT, Token::NE);

- } else {

- token = Token::NOT;

- }

- break;

- case '+':

- // + ++ +=

- Advance();

- if (c0_ == '+') {

- token = Select(Token::INC);

- } else if (c0_ == '=') {

- token = Select(Token::ASSIGN_ADD);

- } else {

- token = Token::ADD;

- }

- break;

- case '-':

- // - -- --> -=

- Advance();

- if (c0_ == '-') {

- Advance();

- if (c0_ == '>' && has_line_terminator_before_next_) {

- // For compatibility with SpiderMonkey, we skip lines that

- // start with an HTML comment end '-->'.

- token = SkipSingleLineComment();

- } else {

- token = Token::DEC;

- }

- } else if (c0_ == '=') {

- token = Select(Token::ASSIGN_SUB);

- } else {

- token = Token::SUB;

- }

- break;

- case '*':

- // * *=

- token = Select('=', Token::ASSIGN_MUL, Token::MUL);

- break;

- case '%':

- // % %=

- token = Select('=', Token::ASSIGN_MOD, Token::MOD);

- break;

- case '/':

- // / // /* /=

- Advance();

- if (c0_ == '/') {

- Advance();

- if (c0_ == '@' || c0_ == '#') {

- Advance();

- token = SkipSourceURLComment();

- } else {

- PushBack(c0_);

- token = SkipSingleLineComment();

- }

- } else if (c0_ == '*') {

- token = SkipMultiLineComment();

- } else if (c0_ == '=') {

- token = Select(Token::ASSIGN_DIV);

- } else {

- token = Token::DIV;

- }

- break;

- case '&':

- // & && &=

- Advance();

- if (c0_ == '&') {

- token = Select(Token::AND);

- } else if (c0_ == '=') {

- token = Select(Token::ASSIGN_BIT_AND);

- } else {

- token = Token::BIT_AND;

- }

- break;

- case '|':

- // | || |=

- Advance();

- if (c0_ == '|') {

- token = Select(Token::OR);

- } else if (c0_ == '=') {

- token = Select(Token::ASSIGN_BIT_OR);

- } else {

- token = Token::BIT_OR;

- }

- break;

- case '^':

- // ^ ^=

- token = Select('=', Token::ASSIGN_BIT_XOR, Token::BIT_XOR);

- break;

- case '.':

- // . Number

- Advance();

- if (IsDecimalDigit(c0_)) {

- token = ScanNumber(true);

- } else {

- token = Token::PERIOD;

- if (c0_ == '.') {

- Advance();

- if (c0_ == '.') {

- Advance();

- token = Token::ELLIPSIS;

- } else {

- PushBack('.');

- }

- break;

- case ':':

- token = Select(Token::COLON);

- break;

- case ';':

- token = Select(Token::SEMICOLON);

- break;

- case ',':

- token = Select(Token::COMMA);

- break;

- case '(':

- token = Select(Token::LPAREN);

- break;

- case ')':

- token = Select(Token::RPAREN);

- break;

- case '[':

- token = Select(Token::LBRACK);

- break;

- case ']':

- token = Select(Token::RBRACK);

- break;

- case '{':

- token = Select(Token::LBRACE);

- break;

- case '}':

- token = Select(Token::RBRACE);

- break;

- case '?':

- token = Select(Token::CONDITIONAL);

- break;

- case '~':

- token = Select(Token::BIT_NOT);

- break;

- case '`':

- token = ScanTemplateStart();

- break;

- default:

- if (c0_ < 0) {

- token = Token::EOS;

- } else if (unicode_cache_->IsIdentifierStart(c0_)) {

- token = ScanIdentifierOrKeyword();

- } else if (IsDecimalDigit(c0_)) {

- token = ScanNumber(false);

- } else if (SkipWhiteSpace()) {

- token = Token::WHITESPACE;

- } else {

- token = Select(Token::ILLEGAL);

- }

- break;

- }

- // Continue scanning for tokens as long as we're just skipping

- // whitespace.

- } while (token == Token::WHITESPACE);

- next_.location.end_pos = source_pos();

- next_.token = token;

-void Scanner::SeekForward(int pos) {

- // After this call, we will have the token at the given position as

- // the "next" token. The "current" token will be invalid.

- if (pos == next_.location.beg_pos) return;

- int current_pos = source_pos();

- DCHECK_EQ(next_.location.end_pos, current_pos);

- // Positions inside the lookahead token aren't supported.

- DCHECK(pos >= current_pos);

- if (pos != current_pos) {

- source_->SeekForward(pos - source_->pos());

- Advance();

- // This function is only called to seek to the location

- // of the end of a function (at the "}" token). It doesn't matter

- // whether there was a line terminator in the part we skip.

- has_line_terminator_before_next_ = false;

- has_multiline_comment_before_next_ = false;

- }

- Scan();

-template <bool capture_raw, bool in_template_literal>

-bool Scanner::ScanEscape() {

- uc32 c = c0_;

- Advance<capture_raw>();

- // Skip escaped newlines.

- if (!in_template_literal && c0_ >= 0 && unicode_cache_->IsLineTerminator(c)) {

- // Allow CR+LF newlines in multiline string literals.

- if (IsCarriageReturn(c) && IsLineFeed(c0_)) Advance<capture_raw>();

- // Allow LF+CR newlines in multiline string literals.

- if (IsLineFeed(c) && IsCarriageReturn(c0_)) Advance<capture_raw>();

- return true;

- }

- switch (c) {

- case '\'': // fall through

- case '"' : // fall through

- case '\\': break;

- case 'b' : c = '\b'; break;

- case 'f' : c = '\f'; break;

- case 'n' : c = '\n'; break;

- case 'r' : c = '\r'; break;

- case 't' : c = '\t'; break;

- case 'u' : {

- c = ScanUnicodeEscape<capture_raw>();

- if (c < 0) return false;

- break;

- }

- case 'v':

- c = '\v';

- break;

- case 'x': {

- c = ScanHexNumber<capture_raw>(2);

- if (c < 0) return false;

- break;

- }

- case '0': // Fall through.

- case '1': // fall through

- case '2': // fall through

- case '3': // fall through

- case '4': // fall through

- case '5': // fall through

- case '6': // fall through

- case '7':

- c = ScanOctalEscape<capture_raw>(c, 2);

- break;

- }

- // According to ECMA-262, section 7.8.4, characters not covered by the

- // above cases should be illegal, but they are commonly handled as

- // non-escaped characters by JS VMs.

- AddLiteralChar(c);

- return true;

-// Octal escapes of the forms '\0xx' and '\xxx' are not a part of

-// ECMA-262. Other JS VMs support them.

-template <bool capture_raw>

-uc32 Scanner::ScanOctalEscape(uc32 c, int length) {

- uc32 x = c - '0';

- int i = 0;

- for (; i < length; i++) {

- int d = c0_ - '0';

- if (d < 0 || d > 7) break;

- int nx = x * 8 + d;

- if (nx >= 256) break;

- x = nx;

- Advance<capture_raw>();

- }

- // Anything except '\0' is an octal escape sequence, illegal in strict mode.

- // Remember the position of octal escape sequences so that an error

- // can be reported later (in strict mode).

- // We don't report the error immediately, because the octal escape can

- // occur before the "use strict" directive.

- if (c != '0' || i > 0) {

- octal_pos_ = Location(source_pos() - i - 1, source_pos() - 1);

- }

- return x;

-const int kMaxAscii = 127;

-Token::Value Scanner::ScanString() {

- uc32 quote = c0_;

- Advance<false, false>(); // consume quote

- LiteralScope literal(this);

- while (true) {

- if (c0_ > kMaxAscii) {

- HandleLeadSurrogate();

- break;

- }

- if (c0_ < 0 || c0_ == '\n' || c0_ == '\r') return Token::ILLEGAL;

- if (c0_ == quote) {

- literal.Complete();

- Advance<false, false>();

- return Token::STRING;

- }

- uc32 c = c0_;

- if (c == '\\') break;

- Advance<false, false>();

- AddLiteralChar(c);

- }

- while (c0_ != quote && c0_ >= 0

- && !unicode_cache_->IsLineTerminator(c0_)) {

- uc32 c = c0_;

- Advance();

- if (c == '\\') {

- if (c0_ < 0 || !ScanEscape<false, false>()) return Token::ILLEGAL;

- } else {

- AddLiteralChar(c);

- }

- if (c0_ != quote) return Token::ILLEGAL;

- literal.Complete();

- Advance(); // consume quote

- return Token::STRING;

-Token::Value Scanner::ScanTemplateSpan() {

- // When scanning a TemplateSpan, we are looking for the following construct:

- // TEMPLATE_SPAN ::

- // ` LiteralChars* ${

- // | } LiteralChars* ${

- //

- // TEMPLATE_TAIL ::

- // ` LiteralChars* `

- // | } LiteralChar* `

- //

- // A TEMPLATE_SPAN should always be followed by an Expression, while a

- // TEMPLATE_TAIL terminates a TemplateLiteral and does not need to be

- // followed by an Expression.

- Token::Value result = Token::TEMPLATE_SPAN;

- LiteralScope literal(this);

- StartRawLiteral();

- const bool capture_raw = true;

- const bool in_template_literal = true;

- while (true) {

- uc32 c = c0_;

- Advance<capture_raw>();

- if (c == '`') {

- result = Token::TEMPLATE_TAIL;

- ReduceRawLiteralLength(1);

- break;

- } else if (c == '$' && c0_ == '{') {

- Advance<capture_raw>(); // Consume '{'

- ReduceRawLiteralLength(2);

- break;

- } else if (c == '\\') {

- if (c0_ > 0 && unicode_cache_->IsLineTerminator(c0_)) {

- // The TV of LineContinuation :: \ LineTerminatorSequence is the empty

- // code unit sequence.

- uc32 lastChar = c0_;

- Advance<capture_raw>();

- if (lastChar == '\r') {

- ReduceRawLiteralLength(1); // Remove \r

- if (c0_ == '\n') {

- Advance<capture_raw>(); // Adds \n

- } else {

- AddRawLiteralChar('\n');

- }

- } else if (!ScanEscape<capture_raw, in_template_literal>()) {

- return Token::ILLEGAL;

- }

- } else if (c < 0) {

- // Unterminated template literal

- PushBack(c);

- break;

- } else {

- // The TRV of LineTerminatorSequence :: <CR> is the CV 0x000A.

- // The TRV of LineTerminatorSequence :: <CR><LF> is the sequence

- // consisting of the CV 0x000A.

- if (c == '\r') {

- ReduceRawLiteralLength(1); // Remove \r

- if (c0_ == '\n') {

- Advance<capture_raw>(); // Adds \n

- } else {

- AddRawLiteralChar('\n');

- }

- c = '\n';

- }

- AddLiteralChar(c);

- }

- literal.Complete();

- next_.location.end_pos = source_pos();

- next_.token = result;

- return result;

-Token::Value Scanner::ScanTemplateStart() {

- DCHECK(c0_ == '`');

- next_.location.beg_pos = source_pos();

- Advance(); // Consume `

- return ScanTemplateSpan();

-Token::Value Scanner::ScanTemplateContinuation() {

- DCHECK_EQ(next_.token, Token::RBRACE);

- next_.location.beg_pos = source_pos() - 1; // We already consumed }

- return ScanTemplateSpan();

-void Scanner::ScanDecimalDigits() {

- while (IsDecimalDigit(c0_))

- AddLiteralCharAdvance();

-Token::Value Scanner::ScanNumber(bool seen_period) {

- DCHECK(IsDecimalDigit(c0_)); // the first digit of the number or the fraction

- enum { DECIMAL, HEX, OCTAL, IMPLICIT_OCTAL, BINARY } kind = DECIMAL;

- LiteralScope literal(this);

- bool at_start = !seen_period;

- if (seen_period) {

- // we have already seen a decimal point of the float

- AddLiteralChar('.');

- ScanDecimalDigits(); // we know we have at least one digit

- } else {

- // if the first character is '0' we must check for octals and hex

- if (c0_ == '0') {

- int start_pos = source_pos(); // For reporting octal positions.

- AddLiteralCharAdvance();

- // either 0, 0exxx, 0Exxx, 0.xxx, a hex number, a binary number or

- // an octal number.

- if (c0_ == 'x' || c0_ == 'X') {

- // hex number

- kind = HEX;

- AddLiteralCharAdvance();

- if (!IsHexDigit(c0_)) {

- // we must have at least one hex digit after 'x'/'X'

- return Token::ILLEGAL;

- }

- while (IsHexDigit(c0_)) {

- AddLiteralCharAdvance();

- }

- } else if (c0_ == 'o' || c0_ == 'O') {

- kind = OCTAL;

- AddLiteralCharAdvance();

- if (!IsOctalDigit(c0_)) {

- // we must have at least one octal digit after 'o'/'O'

- return Token::ILLEGAL;

- }

- while (IsOctalDigit(c0_)) {

- AddLiteralCharAdvance();

- }

- } else if (c0_ == 'b' || c0_ == 'B') {

- kind = BINARY;

- AddLiteralCharAdvance();

- if (!IsBinaryDigit(c0_)) {

- // we must have at least one binary digit after 'b'/'B'

- return Token::ILLEGAL;

- }

- while (IsBinaryDigit(c0_)) {

- AddLiteralCharAdvance();

- }

- } else if ('0' <= c0_ && c0_ <= '7') {

- // (possible) octal number

- kind = IMPLICIT_OCTAL;

- while (true) {

- if (c0_ == '8' || c0_ == '9') {

- at_start = false;

- kind = DECIMAL;

- break;

- }

- if (c0_ < '0' || '7' < c0_) {

- // Octal literal finished.

- octal_pos_ = Location(start_pos, source_pos());

- break;

- }

- AddLiteralCharAdvance();

- }

- // Parse decimal digits and allow trailing fractional part.

- if (kind == DECIMAL) {

- if (at_start) {

- uint64_t value = 0;

- while (IsDecimalDigit(c0_)) {

- value = 10 * value + (c0_ - '0');

- uc32 first_char = c0_;

- Advance<false, false>();

- AddLiteralChar(first_char);

- }

- if (next_.literal_chars->one_byte_literal().length() <= 10 &&

- value <= Smi::kMaxValue && c0_ != '.' && c0_ != 'e' && c0_ != 'E') {

- next_.smi_value_ = static_cast<int>(value);

- literal.Complete();

- HandleLeadSurrogate();

- return Token::SMI;

- }

- HandleLeadSurrogate();

- }

- ScanDecimalDigits(); // optional

- if (c0_ == '.') {

- AddLiteralCharAdvance();

- ScanDecimalDigits(); // optional

- }

- // scan exponent, if any

- if (c0_ == 'e' || c0_ == 'E') {

- DCHECK(kind != HEX); // 'e'/'E' must be scanned as part of the hex number

- if (kind != DECIMAL) return Token::ILLEGAL;

- // scan exponent

- AddLiteralCharAdvance();

- if (c0_ == '+' || c0_ == '-')

- AddLiteralCharAdvance();

- if (!IsDecimalDigit(c0_)) {

- // we must have at least one decimal digit after 'e'/'E'

- return Token::ILLEGAL;

- }

- ScanDecimalDigits();

- }

- // The source character immediately following a numeric literal must

- // not be an identifier start or a decimal digit; see ECMA-262

- // section 7.8.3, page 17 (note that we read only one decimal digit

- // if the value is 0).

- if (IsDecimalDigit(c0_) ||

- (c0_ >= 0 && unicode_cache_->IsIdentifierStart(c0_)))

- return Token::ILLEGAL;

- literal.Complete();

- return Token::NUMBER;

-uc32 Scanner::ScanIdentifierUnicodeEscape() {

- Advance();

- if (c0_ != 'u') return -1;

- Advance();

- return ScanUnicodeEscape<false>();

-template <bool capture_raw>

-uc32 Scanner::ScanUnicodeEscape() {

- // Accept both \uxxxx and \u{xxxxxx}. In the latter case, the number of

- // hex digits between { } is arbitrary. \ and u have already been read.

- if (c0_ == '{') {

- Advance<capture_raw>();

- uc32 cp = ScanUnlimitedLengthHexNumber<capture_raw>(0x10ffff);

- if (cp < 0) {

- return -1;

- }

- if (c0_ != '}') {

- return -1;

- }

- Advance<capture_raw>();

- return cp;

- }

- return ScanHexNumber<capture_raw>(4);

-// ----------------------------------------------------------------------------

-// Keyword Matcher

-#define KEYWORDS(KEYWORD_GROUP, KEYWORD) \

- KEYWORD_GROUP('b') \

- KEYWORD("break", Token::BREAK) \

- KEYWORD_GROUP('c') \

- KEYWORD("case", Token::CASE) \

- KEYWORD("catch", Token::CATCH) \

- KEYWORD("class", Token::CLASS) \

- KEYWORD("const", Token::CONST) \

- KEYWORD("continue", Token::CONTINUE) \

- KEYWORD_GROUP('d') \

- KEYWORD("debugger", Token::DEBUGGER) \

- KEYWORD("default", Token::DEFAULT) \

- KEYWORD("delete", Token::DELETE) \

- KEYWORD("do", Token::DO) \

- KEYWORD_GROUP('e') \

- KEYWORD("else", Token::ELSE) \

- KEYWORD("enum", Token::FUTURE_RESERVED_WORD) \

- KEYWORD("export", Token::EXPORT) \

- KEYWORD("extends", Token::EXTENDS) \

- KEYWORD_GROUP('f') \

- KEYWORD("false", Token::FALSE_LITERAL) \

- KEYWORD("finally", Token::FINALLY) \

- KEYWORD("for", Token::FOR) \

- KEYWORD("function", Token::FUNCTION) \

- KEYWORD_GROUP('i') \

- KEYWORD("if", Token::IF) \

- KEYWORD("implements", Token::FUTURE_STRICT_RESERVED_WORD) \

- KEYWORD("import", Token::IMPORT) \

- KEYWORD("in", Token::IN) \

- KEYWORD("instanceof", Token::INSTANCEOF) \

- KEYWORD("interface", Token::FUTURE_STRICT_RESERVED_WORD) \

- KEYWORD_GROUP('l') \

- KEYWORD("let", Token::LET) \

- KEYWORD_GROUP('n') \

- KEYWORD("new", Token::NEW) \

- KEYWORD("null", Token::NULL_LITERAL) \

- KEYWORD_GROUP('p') \

- KEYWORD("package", Token::FUTURE_STRICT_RESERVED_WORD) \

- KEYWORD("private", Token::FUTURE_STRICT_RESERVED_WORD) \

- KEYWORD("protected", Token::FUTURE_STRICT_RESERVED_WORD) \

- KEYWORD("public", Token::FUTURE_STRICT_RESERVED_WORD) \

- KEYWORD_GROUP('r') \

- KEYWORD("return", Token::RETURN) \

- KEYWORD_GROUP('s') \

- KEYWORD("static", Token::STATIC) \

- KEYWORD("super", Token::SUPER) \

- KEYWORD("switch", Token::SWITCH) \

- KEYWORD_GROUP('t') \

- KEYWORD("this", Token::THIS) \

- KEYWORD("throw", Token::THROW) \

- KEYWORD("true", Token::TRUE_LITERAL) \

- KEYWORD("try", Token::TRY) \

- KEYWORD("typeof", Token::TYPEOF) \

- KEYWORD_GROUP('v') \

- KEYWORD("var", Token::VAR) \

- KEYWORD("void", Token::VOID) \

- KEYWORD_GROUP('w') \

- KEYWORD("while", Token::WHILE) \

- KEYWORD("with", Token::WITH) \

- KEYWORD_GROUP('y') \

- KEYWORD("yield", Token::YIELD)

-static Token::Value KeywordOrIdentifierToken(const uint8_t* input,

- int input_length, bool escaped) {

- DCHECK(input_length >= 1);

- const int kMinLength = 2;

- const int kMaxLength = 10;

- if (input_length < kMinLength || input_length > kMaxLength) {

- return Token::IDENTIFIER;

- }

- switch (input[0]) {

- default:

-#define KEYWORD_GROUP_CASE(ch) \

- break; \

- case ch:

-#define KEYWORD(keyword, token) \

- { \

- /* 'keyword' is a char array, so sizeof(keyword) is */ \

- /* strlen(keyword) plus 1 for the NUL char. */ \

- const int keyword_length = sizeof(keyword) - 1; \

- STATIC_ASSERT(keyword_length >= kMinLength); \

- STATIC_ASSERT(keyword_length <= kMaxLength); \

- if (input_length == keyword_length && input[1] == keyword[1] && \

- (keyword_length <= 2 || input[2] == keyword[2]) && \

- (keyword_length <= 3 || input[3] == keyword[3]) && \

- (keyword_length <= 4 || input[4] == keyword[4]) && \

- (keyword_length <= 5 || input[5] == keyword[5]) && \

- (keyword_length <= 6 || input[6] == keyword[6]) && \

- (keyword_length <= 7 || input[7] == keyword[7]) && \

- (keyword_length <= 8 || input[8] == keyword[8]) && \

- (keyword_length <= 9 || input[9] == keyword[9])) { \

- if (escaped) { \

- return token == Token::FUTURE_STRICT_RESERVED_WORD \

- ? Token::ESCAPED_STRICT_RESERVED_WORD \

- : Token::ESCAPED_KEYWORD; \

- } \

- return token; \

- } \

- }

- KEYWORDS(KEYWORD_GROUP_CASE, KEYWORD)

- }

- return Token::IDENTIFIER;

-bool Scanner::IdentifierIsFutureStrictReserved(

- const AstRawString* string) const {

- // Keywords are always 1-byte strings.

- if (!string->is_one_byte()) return false;

- if (string->IsOneByteEqualTo("let") || string->IsOneByteEqualTo("static") ||

- string->IsOneByteEqualTo("yield")) {

- return true;

- }

- return Token::FUTURE_STRICT_RESERVED_WORD ==

- KeywordOrIdentifierToken(string->raw_data(), string->length(), false);

-Token::Value Scanner::ScanIdentifierOrKeyword() {

- DCHECK(unicode_cache_->IsIdentifierStart(c0_));

- LiteralScope literal(this);

- if (IsInRange(c0_, 'a', 'z')) {

- do {

- uc32 first_char = c0_;

- Advance<false, false>();

- AddLiteralChar(first_char);

- } while (IsInRange(c0_, 'a', 'z'));

- if (IsDecimalDigit(c0_) || IsInRange(c0_, 'A', 'Z') || c0_ == '_' ||

- c0_ == '$') {

- // Identifier starting with lowercase.

- uc32 first_char = c0_;

- Advance<false, false>();

- AddLiteralChar(first_char);

- while (IsAsciiIdentifier(c0_)) {

- uc32 first_char = c0_;

- Advance<false, false>();

- AddLiteralChar(first_char);

- }

- if (c0_ <= kMaxAscii && c0_ != '\\') {

- literal.Complete();

- return Token::IDENTIFIER;

- }

- } else if (c0_ <= kMaxAscii && c0_ != '\\') {

- // Only a-z+: could be a keyword or identifier.

- literal.Complete();

- Vector<const uint8_t> chars = next_.literal_chars->one_byte_literal();

- return KeywordOrIdentifierToken(chars.start(), chars.length(), false);

- }

- HandleLeadSurrogate();

- } else if (IsInRange(c0_, 'A', 'Z') || c0_ == '_' || c0_ == '$') {

- do {

- uc32 first_char = c0_;

- Advance<false, false>();

- AddLiteralChar(first_char);

- } while (IsAsciiIdentifier(c0_));

- if (c0_ <= kMaxAscii && c0_ != '\\') {

- literal.Complete();

- return Token::IDENTIFIER;

- }

- HandleLeadSurrogate();

- } else if (c0_ == '\\') {

- // Scan identifier start character.

- uc32 c = ScanIdentifierUnicodeEscape();

- // Only allow legal identifier start characters.

- if (c < 0 ||

- c == '\\' || // No recursive escapes.

- !unicode_cache_->IsIdentifierStart(c)) {

- return Token::ILLEGAL;

- }

- AddLiteralChar(c);

- return ScanIdentifierSuffix(&literal, true);

- } else {

- uc32 first_char = c0_;

- Advance();

- AddLiteralChar(first_char);

- }

- // Scan the rest of the identifier characters.

- while (c0_ >= 0 && unicode_cache_->IsIdentifierPart(c0_)) {

- if (c0_ != '\\') {

- uc32 next_char = c0_;

- Advance();

- AddLiteralChar(next_char);

- continue;

- }

- // Fallthrough if no longer able to complete keyword.

- return ScanIdentifierSuffix(&literal, false);

- }

- literal.Complete();

- if (next_.literal_chars->is_one_byte()) {

- Vector<const uint8_t> chars = next_.literal_chars->one_byte_literal();

- return KeywordOrIdentifierToken(chars.start(), chars.length(), false);

- }

- return Token::IDENTIFIER;

-Token::Value Scanner::ScanIdentifierSuffix(LiteralScope* literal,

- bool escaped) {

- // Scan the rest of the identifier characters.

- while (c0_ >= 0 && unicode_cache_->IsIdentifierPart(c0_)) {

- if (c0_ == '\\') {

- uc32 c = ScanIdentifierUnicodeEscape();

- escaped = true;

- // Only allow legal identifier part characters.

- if (c < 0 ||

- c == '\\' ||

- !unicode_cache_->IsIdentifierPart(c)) {

- return Token::ILLEGAL;

- }

- AddLiteralChar(c);

- } else {

- AddLiteralChar(c0_);

- Advance();

- }

- literal->Complete();

- if (escaped && next_.literal_chars->is_one_byte()) {

- Vector<const uint8_t> chars = next_.literal_chars->one_byte_literal();

- return KeywordOrIdentifierToken(chars.start(), chars.length(), true);

- }

- return Token::IDENTIFIER;

-bool Scanner::ScanRegExpPattern(bool seen_equal) {

- // Scan: ('/' | '/=') RegularExpressionBody '/' RegularExpressionFlags

- bool in_character_class = false;

- // Previous token is either '/' or '/=', in the second case, the

- // pattern starts at =.

- next_.location.beg_pos = source_pos() - (seen_equal ? 2 : 1);

- next_.location.end_pos = source_pos() - (seen_equal ? 1 : 0);

- // Scan regular expression body: According to ECMA-262, 3rd, 7.8.5,

- // the scanner should pass uninterpreted bodies to the RegExp

- // constructor.

- LiteralScope literal(this);

- if (seen_equal) {

- AddLiteralChar('=');

- }

- while (c0_ != '/' || in_character_class) {

- if (c0_ < 0 || unicode_cache_->IsLineTerminator(c0_)) return false;

- if (c0_ == '\\') { // Escape sequence.

- AddLiteralCharAdvance();

- if (c0_ < 0 || unicode_cache_->IsLineTerminator(c0_)) return false;

- AddLiteralCharAdvance();

- // If the escape allows more characters, i.e., \x??, \u????, or \c?,

- // only "safe" characters are allowed (letters, digits, underscore),

- // otherwise the escape isn't valid and the invalid character has

- // its normal meaning. I.e., we can just continue scanning without

- // worrying whether the following characters are part of the escape

- // or not, since any '/', '\\' or '[' is guaranteed to not be part

- // of the escape sequence.

- // TODO(896): At some point, parse RegExps more throughly to capture

- // octal esacpes in strict mode.

- } else { // Unescaped character.

- if (c0_ == '[') in_character_class = true;

- if (c0_ == ']') in_character_class = false;

- AddLiteralCharAdvance();

- }

- Advance(); // consume '/'

- literal.Complete();

- return true;

-Maybe<RegExp::Flags> Scanner::ScanRegExpFlags() {

- // Scan regular expression flags.

- LiteralScope literal(this);

- int flags = 0;

- while (c0_ >= 0 && unicode_cache_->IsIdentifierPart(c0_)) {

- RegExp::Flags flag = RegExp::kNone;

- switch (c0_) {

- case 'g':

- flag = RegExp::kGlobal;

- break;

- case 'i':

- flag = RegExp::kIgnoreCase;

- break;

- case 'm':

- flag = RegExp::kMultiline;

- break;

- case 'u':

- if (!FLAG_harmony_unicode_regexps) return Nothing<RegExp::Flags>();

- flag = RegExp::kUnicode;

- break;

- case 'y':

- if (!FLAG_harmony_regexps) return Nothing<RegExp::Flags>();

- flag = RegExp::kSticky;

- break;

- default:

- return Nothing<RegExp::Flags>();

- }

- if (flags & flag) return Nothing<RegExp::Flags>();

- AddLiteralCharAdvance();

- flags |= flag;

- }

- literal.Complete();

- next_.location.end_pos = source_pos();

- return Just(RegExp::Flags(flags));

-const AstRawString* Scanner::CurrentSymbol(AstValueFactory* ast_value_factory) {

- if (is_literal_one_byte()) {

- return ast_value_factory->GetOneByteString(literal_one_byte_string());

- }

- return ast_value_factory->GetTwoByteString(literal_two_byte_string());

-const AstRawString* Scanner::NextSymbol(AstValueFactory* ast_value_factory) {

- if (is_next_literal_one_byte()) {

- return ast_value_factory->GetOneByteString(next_literal_one_byte_string());

- }

- return ast_value_factory->GetTwoByteString(next_literal_two_byte_string());

-const AstRawString* Scanner::CurrentRawSymbol(

- AstValueFactory* ast_value_factory) {

- if (is_raw_literal_one_byte()) {

- return ast_value_factory->GetOneByteString(raw_literal_one_byte_string());

- }

- return ast_value_factory->GetTwoByteString(raw_literal_two_byte_string());

-double Scanner::DoubleValue() {

- DCHECK(is_literal_one_byte());

- return StringToDouble(

- unicode_cache_,

- literal_one_byte_string(),

- ALLOW_HEX | ALLOW_OCTAL | ALLOW_IMPLICIT_OCTAL | ALLOW_BINARY);

-bool Scanner::ContainsDot() {

- DCHECK(is_literal_one_byte());

- Vector<const uint8_t> str = literal_one_byte_string();

- return std::find(str.begin(), str.end(), '.') != str.end();

-int Scanner::FindSymbol(DuplicateFinder* finder, int value) {

- if (is_literal_one_byte()) {

- return finder->AddOneByteSymbol(literal_one_byte_string(), value);

- }

- return finder->AddTwoByteSymbol(literal_two_byte_string(), value);

-bool Scanner::SetBookmark() {

- if (c0_ != kNoBookmark && bookmark_c0_ == kNoBookmark &&

- next_next_.token == Token::UNINITIALIZED && source_->SetBookmark()) {

- bookmark_c0_ = c0_;

- CopyTokenDesc(&bookmark_current_, &current_);

- CopyTokenDesc(&bookmark_next_, &next_);

- return true;

- }

- return false;

-void Scanner::ResetToBookmark() {

- DCHECK(BookmarkHasBeenSet()); // Caller hasn't called SetBookmark.

- source_->ResetToBookmark();

- c0_ = bookmark_c0_;

- StartLiteral();

- StartRawLiteral();

- CopyTokenDesc(&next_, &bookmark_current_);

- current_ = next_;

- StartLiteral();

- StartRawLiteral();

- CopyTokenDesc(&next_, &bookmark_next_);

- bookmark_c0_ = kBookmarkWasApplied;

-bool Scanner::BookmarkHasBeenSet() { return bookmark_c0_ >= 0; }

-bool Scanner::BookmarkHasBeenReset() {

- return bookmark_c0_ == kBookmarkWasApplied;

-void Scanner::DropBookmark() { bookmark_c0_ = kNoBookmark; }

-void Scanner::CopyTokenDesc(TokenDesc* to, TokenDesc* from) {

- DCHECK_NOT_NULL(to);

- DCHECK_NOT_NULL(from);

- to->token = from->token;

- to->location = from->location;

- to->literal_chars->CopyFrom(from->literal_chars);

- to->raw_literal_chars->CopyFrom(from->raw_literal_chars);

-int DuplicateFinder::AddOneByteSymbol(Vector<const uint8_t> key, int value) {

- return AddSymbol(key, true, value);

-int DuplicateFinder::AddTwoByteSymbol(Vector<const uint16_t> key, int value) {

- return AddSymbol(Vector<const uint8_t>::cast(key), false, value);

-int DuplicateFinder::AddSymbol(Vector<const uint8_t> key,

- bool is_one_byte,

- int value) {

- uint32_t hash = Hash(key, is_one_byte);

- byte* encoding = BackupKey(key, is_one_byte);

- HashMap::Entry* entry = map_.LookupOrInsert(encoding, hash);

- int old_value = static_cast<int>(reinterpret_cast<intptr_t>(entry->value));

- entry->value =

- reinterpret_cast<void*>(static_cast<intptr_t>(value | old_value));

- return old_value;

-int DuplicateFinder::AddNumber(Vector<const uint8_t> key, int value) {

- DCHECK(key.length() > 0);

- // Quick check for already being in canonical form.

- if (IsNumberCanonical(key)) {

- return AddOneByteSymbol(key, value);

- }

- int flags = ALLOW_HEX | ALLOW_OCTAL | ALLOW_IMPLICIT_OCTAL | ALLOW_BINARY;

- double double_value = StringToDouble(

- unicode_constants_, key, flags, 0.0);

- int length;

- const char* string;

- if (!std::isfinite(double_value)) {

- string = "Infinity";

- length = 8; // strlen("Infinity");

- } else {

- string = DoubleToCString(double_value,

- Vector<char>(number_buffer_, kBufferSize));

- length = StrLength(string);

- }

- return AddSymbol(Vector<const byte>(reinterpret_cast<const byte*>(string),

- length), true, value);

-bool DuplicateFinder::IsNumberCanonical(Vector<const uint8_t> number) {

- // Test for a safe approximation of number literals that are already

- // in canonical form: max 15 digits, no leading zeroes, except an

- // integer part that is a single zero, and no trailing zeros below

- // the decimal point.

- int pos = 0;

- int length = number.length();

- if (number.length() > 15) return false;

- if (number[pos] == '0') {

- pos++;

- } else {

- while (pos < length &&

- static_cast<unsigned>(number[pos] - '0') <= ('9' - '0')) pos++;

- }

- if (length == pos) return true;

- if (number[pos] != '.') return false;

- pos++;

- bool invalid_last_digit = true;

- while (pos < length) {

- uint8_t digit = number[pos] - '0';

- if (digit > '9' - '0') return false;

- invalid_last_digit = (digit == 0);

- pos++;

- }

- return !invalid_last_digit;

-uint32_t DuplicateFinder::Hash(Vector<const uint8_t> key, bool is_one_byte) {

- // Primitive hash function, almost identical to the one used

- // for strings (except that it's seeded by the length and representation).

- int length = key.length();

- uint32_t hash = (length << 1) | (is_one_byte ? 1 : 0);

- for (int i = 0; i < length; i++) {

- uint32_t c = key[i];

- hash = (hash + c) * 1025;

- hash ^= (hash >> 6);

- }

- return hash;

-bool DuplicateFinder::Match(void* first, void* second) {

- // Decode lengths.

- // Length + representation is encoded as base 128, most significant heptet

- // first, with a 8th bit being non-zero while there are more heptets.

- // The value encodes the number of bytes following, and whether the original

- // was Latin1.

- byte* s1 = reinterpret_cast<byte*>(first);

- byte* s2 = reinterpret_cast<byte*>(second);

- uint32_t length_one_byte_field = 0;

- byte c1;

- do {

- c1 = *s1;

- if (c1 != *s2) return false;

- length_one_byte_field = (length_one_byte_field << 7) | (c1 & 0x7f);

- s1++;

- s2++;

- } while ((c1 & 0x80) != 0);

- int length = static_cast<int>(length_one_byte_field >> 1);

- return memcmp(s1, s2, length) == 0;

-byte* DuplicateFinder::BackupKey(Vector<const uint8_t> bytes,

- bool is_one_byte) {

- uint32_t one_byte_length = (bytes.length() << 1) | (is_one_byte ? 1 : 0);

- backing_store_.StartSequence();

- // Emit one_byte_length as base-128 encoded number, with the 7th bit set

- // on the byte of every heptet except the last, least significant, one.

- if (one_byte_length >= (1 << 7)) {

- if (one_byte_length >= (1 << 14)) {

- if (one_byte_length >= (1 << 21)) {

- if (one_byte_length >= (1 << 28)) {

- backing_store_.Add(

- static_cast<uint8_t>((one_byte_length >> 28) | 0x80));

- }

- backing_store_.Add(

- static_cast<uint8_t>((one_byte_length >> 21) | 0x80u));

- }

- backing_store_.Add(

- static_cast<uint8_t>((one_byte_length >> 14) | 0x80u));

- }

- backing_store_.Add(static_cast<uint8_t>((one_byte_length >> 7) | 0x80u));

- }

- backing_store_.Add(static_cast<uint8_t>(one_byte_length & 0x7f));

- backing_store_.AddBlock(bytes);

- return backing_store_.EndSequence().start();

-} // namespace internal

-} // namespace v8

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