#include "BuiltinNames.h"
#include "JSGlobalObjectFunctions.h"
#include "Identifier.h"
-#include "NodeInfo.h"
#include "Nodes.h"
#include "JSCInlines.h"
#include <wtf/dtoa.h>
CharacterQuestion,
CharacterTilde,
CharacterQuote,
+ CharacterBackQuote,
CharacterDot,
CharacterSlash,
CharacterBackSlash,
/* 93 - ] */ CharacterCloseBracket,
/* 94 - ^ */ CharacterXor,
/* 95 - _ */ CharacterIdentifierStart,
+#if ENABLE(ES6_TEMPLATE_LITERAL_SYNTAX)
+/* 96 - ` */ CharacterBackQuote,
+#else
/* 96 - ` */ CharacterInvalid,
+#endif
/* 97 - a */ CharacterIdentifierStart,
/* 98 - b */ CharacterIdentifierStart,
/* 99 - c */ CharacterIdentifierStart,
};
template <typename T>
-Lexer<T>::Lexer(VM* vm, JSParserStrictness strictness)
+Lexer<T>::Lexer(VM* vm, JSParserBuiltinMode builtinMode)
: m_isReparsing(false)
, m_vm(vm)
- , m_parsingBuiltinFunction(strictness == JSParseBuiltin)
+ , m_parsingBuiltinFunction(builtinMode == JSParserBuiltinMode::Builtin)
{
}
+static inline JSTokenType tokenTypeForIntegerLikeToken(double doubleValue)
+{
+ if ((doubleValue || !std::signbit(doubleValue)) && static_cast<int64_t>(doubleValue) == doubleValue)
+ return INTEGER;
+ return DOUBLE;
+}
+
template <typename T>
Lexer<T>::~Lexer()
{
{
switch (m_current) {
case 0:
- return "Invalid character: '\\0'";
+ return ASCIILiteral("Invalid character: '\\0'");
case 10:
- return "Invalid character: '\\n'";
+ return ASCIILiteral("Invalid character: '\\n'");
case 11:
- return "Invalid character: '\\v'";
+ return ASCIILiteral("Invalid character: '\\v'");
case 13:
- return "Invalid character: '\\r'";
+ return ASCIILiteral("Invalid character: '\\r'");
case 35:
- return "Invalid character: '#'";
+ return ASCIILiteral("Invalid character: '#'");
case 64:
- return "Invalid character: '@'";
+ return ASCIILiteral("Invalid character: '@'");
case 96:
- return "Invalid character: '`'";
+ return ASCIILiteral("Invalid character: '`'");
default:
- return String::format("Invalid character '\\u%04u'", static_cast<unsigned>(m_current)).impl();
+ return String::format("Invalid character '\\u%04u'", static_cast<unsigned>(m_current));
}
}
m_buffer8.reserveInitialCapacity(initialReadBufferCapacity);
m_buffer16.reserveInitialCapacity((m_codeEnd - m_code) / 2);
+ m_bufferForRawTemplateString16.reserveInitialCapacity(initialReadBufferCapacity);
if (LIKELY(m_code < m_codeEnd))
m_current = *m_code;
return (code < m_codeEnd) ? *code : 0;
}
-template <typename T>
-typename Lexer<T>::UnicodeHexValue Lexer<T>::parseFourDigitUnicodeHex()
-{
- T char1 = peek(1);
- T char2 = peek(2);
- T char3 = peek(3);
+struct ParsedUnicodeEscapeValue {
+ ParsedUnicodeEscapeValue(UChar32 value)
+ : m_value(value)
+ {
+ ASSERT(isValid());
+ }
+
+ enum SpecialValueType { Incomplete = -2, Invalid = -1 };
+ ParsedUnicodeEscapeValue(SpecialValueType type)
+ : m_value(type)
+ {
+ }
+
+ bool isValid() const { return m_value >= 0; }
+ bool isIncomplete() const { return m_value == Incomplete; }
- if (UNLIKELY(!isASCIIHexDigit(m_current) || !isASCIIHexDigit(char1) || !isASCIIHexDigit(char2) || !isASCIIHexDigit(char3)))
- return UnicodeHexValue((m_code + 4) >= m_codeEnd ? UnicodeHexValue::IncompleteHex : UnicodeHexValue::InvalidHex);
+ UChar32 value() const
+ {
+ ASSERT(isValid());
+ return m_value;
+ }
+
+private:
+ UChar32 m_value;
+};
+
+template<typename CharacterType> ParsedUnicodeEscapeValue Lexer<CharacterType>::parseUnicodeEscape()
+{
+ if (m_current == '{') {
+ shift();
+ UChar32 codePoint = 0;
+ do {
+ if (!isASCIIHexDigit(m_current))
+ return m_current ? ParsedUnicodeEscapeValue::Invalid : ParsedUnicodeEscapeValue::Incomplete;
+ codePoint = (codePoint << 4) | toASCIIHexValue(m_current);
+ if (codePoint > UCHAR_MAX_VALUE)
+ return ParsedUnicodeEscapeValue::Invalid;
+ shift();
+ } while (m_current != '}');
+ shift();
+ return codePoint;
+ }
- int result = convertUnicode(m_current, char1, char2, char3);
+ auto character2 = peek(1);
+ auto character3 = peek(2);
+ auto character4 = peek(3);
+ if (UNLIKELY(!isASCIIHexDigit(m_current) || !isASCIIHexDigit(character2) || !isASCIIHexDigit(character3) || !isASCIIHexDigit(character4)))
+ return (m_code + 4) >= m_codeEnd ? ParsedUnicodeEscapeValue::Incomplete : ParsedUnicodeEscapeValue::Invalid;
+ auto result = convertUnicode(m_current, character2, character3, character4);
shift();
shift();
shift();
shift();
- return UnicodeHexValue(result);
+ return result;
}
template <typename T>
return c < 256;
}
+static ALWAYS_INLINE bool isLatin1(UChar32 c)
+{
+ return !(c & ~0xFF);
+}
+
static inline bool isIdentStart(LChar c)
{
return typesOfLatin1Characters[c] == CharacterIdentifierStart;
}
-static inline bool isIdentStart(UChar c)
+static inline bool isIdentStart(UChar32 c)
{
return isLatin1(c) ? isIdentStart(static_cast<LChar>(c)) : isNonLatin1IdentStart(c);
}
-static NEVER_INLINE bool isNonLatin1IdentPart(int c)
+static NEVER_INLINE bool isNonLatin1IdentPart(UChar32 c)
{
+ // FIXME: ES6 says this should be based on the Unicode property ID_Continue now instead.
return (U_GET_GC_MASK(c) & (U_GC_L_MASK | U_GC_MN_MASK | U_GC_MC_MASK | U_GC_ND_MASK | U_GC_PC_MASK)) || c == 0x200C || c == 0x200D;
}
return typesOfLatin1Characters[c] <= CharacterNumber;
}
-static ALWAYS_INLINE bool isIdentPart(UChar c)
+static ALWAYS_INLINE bool isIdentPart(UChar32 c)
{
return isLatin1(c) ? isIdentPart(static_cast<LChar>(c)) : isNonLatin1IdentPart(c);
}
+static ALWAYS_INLINE bool isIdentPart(UChar c)
+{
+ return isIdentPart(static_cast<UChar32>(c));
+}
+
+template<typename CharacterType> ALWAYS_INLINE bool isIdentPartIncludingEscapeTemplate(const CharacterType* code, const CharacterType* codeEnd)
+{
+ if (isIdentPart(code[0]))
+ return true;
+
+ // Shortest sequence handled below is \u{0}, which is 5 characters.
+ if (!(code[0] == '\\' && codeEnd - code >= 5 && code[1] == 'u'))
+ return false;
+
+ if (code[2] == '{') {
+ UChar32 codePoint = 0;
+ const CharacterType* pointer;
+ for (pointer = &code[3]; pointer < codeEnd; ++pointer) {
+ auto digit = *pointer;
+ if (!isASCIIHexDigit(digit))
+ break;
+ codePoint = (codePoint << 4) | toASCIIHexValue(digit);
+ if (codePoint > UCHAR_MAX_VALUE)
+ return false;
+ }
+ return isIdentPart(codePoint) && pointer < codeEnd && *pointer == '}';
+ }
+
+ // Shortest sequence handled below is \uXXXX, which is 6 characters.
+ if (codeEnd - code < 6)
+ return false;
+
+ auto character1 = code[2];
+ auto character2 = code[3];
+ auto character3 = code[4];
+ auto character4 = code[5];
+ return isASCIIHexDigit(character1) && isASCIIHexDigit(character2) && isASCIIHexDigit(character3) && isASCIIHexDigit(character4)
+ && isIdentPart(Lexer<LChar>::convertUnicode(character1, character2, character3, character4));
+}
+
+static ALWAYS_INLINE bool isIdentPartIncludingEscape(const LChar* code, const LChar* codeEnd)
+{
+ return isIdentPartIncludingEscapeTemplate(code, codeEnd);
+}
+
+static ALWAYS_INLINE bool isIdentPartIncludingEscape(const UChar* code, const UChar* codeEnd)
+{
+ return isIdentPartIncludingEscapeTemplate(code, codeEnd);
+}
+
static inline LChar singleEscape(int c)
{
if (c < 128) {
m_buffer16.append(static_cast<UChar>(c));
}
+template<typename CharacterType> inline void Lexer<CharacterType>::recordUnicodeCodePoint(UChar32 codePoint)
+{
+ ASSERT(codePoint >= 0);
+ ASSERT(codePoint <= UCHAR_MAX_VALUE);
+ if (U_IS_BMP(codePoint))
+ record16(codePoint);
+ else {
+ UChar codeUnits[2] = { U16_LEAD(codePoint), U16_TRAIL(codePoint) };
+ append16(codeUnits, 2);
+ }
+}
+
#if !ASSERT_DISABLED
bool isSafeBuiltinIdentifier(VM& vm, const Identifier* ident)
{
/* Just block any use of suspicious identifiers. This is intended to
* be used as a safety net while implementing builtins.
*/
+ // FIXME: How can a debug-only assertion be a safety net?
if (*ident == vm.propertyNames->builtinNames().callPublicName())
return false;
if (*ident == vm.propertyNames->builtinNames().applyPublicName())
return IDENT;
}
-template <typename T>
-template <bool shouldCreateIdentifier> JSTokenType Lexer<T>::parseIdentifierSlowCase(JSTokenData* tokenData, unsigned lexerFlags, bool strictMode)
+template<typename CharacterType> template<bool shouldCreateIdentifier> JSTokenType Lexer<CharacterType>::parseIdentifierSlowCase(JSTokenData* tokenData, unsigned lexerFlags, bool strictMode)
{
- const ptrdiff_t remaining = m_codeEnd - m_code;
- const T* identifierStart = currentSourcePtr();
+ auto identifierStart = currentSourcePtr();
bool bufferRequired = false;
while (true) {
if (UNLIKELY(m_current != 'u'))
return atEnd() ? UNTERMINATED_IDENTIFIER_ESCAPE_ERRORTOK : INVALID_IDENTIFIER_ESCAPE_ERRORTOK;
shift();
- UnicodeHexValue character = parseFourDigitUnicodeHex();
+ auto character = parseUnicodeEscape();
if (UNLIKELY(!character.isValid()))
- return character.valueType() == UnicodeHexValue::IncompleteHex ? UNTERMINATED_IDENTIFIER_UNICODE_ESCAPE_ERRORTOK : INVALID_IDENTIFIER_UNICODE_ESCAPE_ERRORTOK;
- UChar ucharacter = static_cast<UChar>(character.value());
- if (UNLIKELY(m_buffer16.size() ? !isIdentPart(ucharacter) : !isIdentStart(ucharacter)))
+ return character.isIncomplete() ? UNTERMINATED_IDENTIFIER_UNICODE_ESCAPE_ERRORTOK : INVALID_IDENTIFIER_UNICODE_ESCAPE_ERRORTOK;
+ if (UNLIKELY(m_buffer16.size() ? !isIdentPart(character.value()) : !isIdentStart(character.value())))
return INVALID_IDENTIFIER_UNICODE_ESCAPE_ERRORTOK;
if (shouldCreateIdentifier)
- record16(ucharacter);
+ recordUnicodeCodePoint(character.value());
identifierStart = currentSourcePtr();
}
int identifierLength;
- const Identifier* ident = 0;
+ const Identifier* ident = nullptr;
if (shouldCreateIdentifier) {
if (!bufferRequired) {
identifierLength = currentSourcePtr() - identifierStart;
tokenData->ident = ident;
} else
- tokenData->ident = 0;
+ tokenData->ident = nullptr;
- if (LIKELY(!bufferRequired && !(lexerFlags & LexerFlagsIgnoreReservedWords))) {
+ m_buffer16.shrink(0);
+
+ if (LIKELY(!(lexerFlags & LexerFlagsIgnoreReservedWords))) {
ASSERT(shouldCreateIdentifier);
- // Keywords must not be recognized if there was an \uXXXX in the identifier.
- if (remaining < maxTokenLength) {
- const HashTableValue* entry = m_vm->keywords->getKeyword(*ident);
- ASSERT((remaining < maxTokenLength) || !entry);
- if (!entry)
- return IDENT;
- JSTokenType token = static_cast<JSTokenType>(entry->lexerValue());
- return (token != RESERVED_IF_STRICT) || strictMode ? token : IDENT;
- }
- return IDENT;
+ const HashTableValue* entry = m_vm->keywords->getKeyword(*ident);
+ if (!entry)
+ return IDENT;
+ JSTokenType token = static_cast<JSTokenType>(entry->lexerValue());
+ return (token != RESERVED_IF_STRICT) || strictMode ? token : IDENT;
}
- m_buffer16.resize(0);
return IDENT;
}
LChar escape = singleEscape(m_current);
- // Most common escape sequences first
+ // Most common escape sequences first.
if (escape) {
if (shouldBuildStrings)
record8(escape);
else if (m_current == 'x') {
shift();
if (!isASCIIHexDigit(m_current) || !isASCIIHexDigit(peek(1))) {
- m_lexErrorMessage = "\\x can only be followed by a hex character sequence";
+ m_lexErrorMessage = ASCIILiteral("\\x can only be followed by a hex character sequence");
return (atEnd() || (isASCIIHexDigit(m_current) && (m_code + 1 == m_codeEnd))) ? StringUnterminated : StringCannotBeParsed;
}
T prev = m_current;
} else {
setOffset(startingOffset, startingLineStartOffset);
setLineNumber(startingLineNumber);
- m_buffer8.resize(0);
+ m_buffer8.shrink(0);
return parseStringSlowCase<shouldBuildStrings>(tokenData, strictMode);
}
stringStart = currentSourcePtr();
if (UNLIKELY(characterRequiresParseStringSlowCase(m_current))) {
setOffset(startingOffset, startingLineStartOffset);
setLineNumber(startingLineNumber);
- m_buffer8.resize(0);
+ m_buffer8.shrink(0);
return parseStringSlowCase<shouldBuildStrings>(tokenData, strictMode);
}
append8(stringStart, currentSourcePtr() - stringStart);
if (shouldBuildStrings) {
tokenData->ident = makeIdentifier(m_buffer8.data(), m_buffer8.size());
- m_buffer8.resize(0);
+ m_buffer8.shrink(0);
} else
tokenData->ident = 0;
}
template <typename T>
-template <bool shouldBuildStrings> typename Lexer<T>::StringParseResult Lexer<T>::parseStringSlowCase(JSTokenData* tokenData, bool strictMode)
+template <bool shouldBuildStrings> ALWAYS_INLINE auto Lexer<T>::parseComplexEscape(EscapeParseMode escapeParseMode, bool strictMode, T stringQuoteCharacter) -> StringParseResult
+{
+ if (m_current == 'x') {
+ shift();
+ if (!isASCIIHexDigit(m_current) || !isASCIIHexDigit(peek(1))) {
+ m_lexErrorMessage = ASCIILiteral("\\x can only be followed by a hex character sequence");
+ return StringCannotBeParsed;
+ }
+ T prev = m_current;
+ shift();
+ if (shouldBuildStrings)
+ record16(convertHex(prev, m_current));
+ shift();
+ return StringParsedSuccessfully;
+ }
+
+ if (m_current == 'u') {
+ shift();
+
+ if (escapeParseMode == EscapeParseMode::String && m_current == stringQuoteCharacter) {
+ if (shouldBuildStrings)
+ record16('u');
+ return StringParsedSuccessfully;
+ }
+
+ auto character = parseUnicodeEscape();
+ if (character.isValid()) {
+ if (shouldBuildStrings)
+ recordUnicodeCodePoint(character.value());
+ return StringParsedSuccessfully;
+ }
+
+ m_lexErrorMessage = ASCIILiteral("\\u can only be followed by a Unicode character sequence");
+ return character.isIncomplete() ? StringUnterminated : StringCannotBeParsed;
+ }
+
+ if (strictMode) {
+ if (isASCIIDigit(m_current)) {
+ // The only valid numeric escape in strict mode is '\0', and this must not be followed by a decimal digit.
+ int character1 = m_current;
+ shift();
+ if (character1 != '0' || isASCIIDigit(m_current)) {
+ m_lexErrorMessage = ASCIILiteral("The only valid numeric escape in strict mode is '\\0'");
+ return StringCannotBeParsed;
+ }
+ if (shouldBuildStrings)
+ record16(0);
+ return StringParsedSuccessfully;
+ }
+ } else {
+ if (isASCIIOctalDigit(m_current)) {
+ // Octal character sequences
+ T character1 = m_current;
+ shift();
+ if (isASCIIOctalDigit(m_current)) {
+ // Two octal characters
+ T character2 = m_current;
+ shift();
+ if (character1 >= '0' && character1 <= '3' && isASCIIOctalDigit(m_current)) {
+ if (shouldBuildStrings)
+ record16((character1 - '0') * 64 + (character2 - '0') * 8 + m_current - '0');
+ shift();
+ } else {
+ if (shouldBuildStrings)
+ record16((character1 - '0') * 8 + character2 - '0');
+ }
+ } else {
+ if (shouldBuildStrings)
+ record16(character1 - '0');
+ }
+ return StringParsedSuccessfully;
+ }
+ }
+
+ if (!atEnd()) {
+ if (shouldBuildStrings)
+ record16(m_current);
+ shift();
+ return StringParsedSuccessfully;
+ }
+
+ m_lexErrorMessage = ASCIILiteral("Unterminated string constant");
+ return StringUnterminated;
+}
+
+template <typename T>
+template <bool shouldBuildStrings> auto Lexer<T>::parseStringSlowCase(JSTokenData* tokenData, bool strictMode) -> StringParseResult
{
T stringQuoteCharacter = m_current;
shift();
shift();
} else if (UNLIKELY(isLineTerminator(m_current)))
shiftLineTerminator();
- else if (m_current == 'x') {
- shift();
- if (!isASCIIHexDigit(m_current) || !isASCIIHexDigit(peek(1))) {
- m_lexErrorMessage = "\\x can only be followed by a hex character sequence";
- return StringCannotBeParsed;
- }
- T prev = m_current;
- shift();
- if (shouldBuildStrings)
- record16(convertHex(prev, m_current));
- shift();
- } else if (m_current == 'u') {
- shift();
- UnicodeHexValue character = parseFourDigitUnicodeHex();
- if (character.isValid()) {
- if (shouldBuildStrings)
- record16(character.value());
- } else if (m_current == stringQuoteCharacter) {
- if (shouldBuildStrings)
- record16('u');
- } else {
- m_lexErrorMessage = "\\u can only be followed by a Unicode character sequence";
- return character.valueType() == UnicodeHexValue::IncompleteHex ? StringUnterminated : StringCannotBeParsed;
- }
- } else if (strictMode && isASCIIDigit(m_current)) {
- // The only valid numeric escape in strict mode is '\0', and this must not be followed by a decimal digit.
- int character1 = m_current;
- shift();
- if (character1 != '0' || isASCIIDigit(m_current)) {
- m_lexErrorMessage = "The only valid numeric escape in strict mode is '\\0'";
- return StringCannotBeParsed;
- }
- if (shouldBuildStrings)
- record16(0);
- } else if (!strictMode && isASCIIOctalDigit(m_current)) {
- // Octal character sequences
- T character1 = m_current;
- shift();
- if (isASCIIOctalDigit(m_current)) {
- // Two octal characters
- T character2 = m_current;
- shift();
- if (character1 >= '0' && character1 <= '3' && isASCIIOctalDigit(m_current)) {
- if (shouldBuildStrings)
- record16((character1 - '0') * 64 + (character2 - '0') * 8 + m_current - '0');
- shift();
- } else {
- if (shouldBuildStrings)
- record16((character1 - '0') * 8 + character2 - '0');
- }
- } else {
- if (shouldBuildStrings)
- record16(character1 - '0');
- }
- } else if (!atEnd()) {
- if (shouldBuildStrings)
- record16(m_current);
- shift();
- } else {
- m_lexErrorMessage = "Unterminated string constant";
- return StringUnterminated;
+ else {
+ StringParseResult result = parseComplexEscape<shouldBuildStrings>(EscapeParseMode::String, strictMode, stringQuoteCharacter);
+ if (result != StringParsedSuccessfully)
+ return result;
}
stringStart = currentSourcePtr();
if (UNLIKELY(((static_cast<unsigned>(m_current) - 0xE) & 0x2000))) {
// New-line or end of input is not allowed
if (atEnd() || isLineTerminator(m_current)) {
- m_lexErrorMessage = "Unexpected EOF";
+ m_lexErrorMessage = ASCIILiteral("Unexpected EOF");
return atEnd() ? StringUnterminated : StringCannotBeParsed;
}
// Anything else is just a normal character
else
tokenData->ident = 0;
- m_buffer16.resize(0);
+ m_buffer16.shrink(0);
return StringParsedSuccessfully;
}
+#if ENABLE(ES6_TEMPLATE_LITERAL_SYNTAX)
+// While the lexer accepts <LF><CR> (not <CR><LF>) sequence
+// as one line terminator and increments one line number,
+// TemplateLiteral considers it as two line terminators <LF> and <CR>.
+//
+// TemplateLiteral normalizes line terminators as follows.
+//
+// <LF> => <LF>
+// <CR> => <LF>
+// <CR><LF> => <LF>
+// <\u2028> => <\u2028>
+// <\u2029> => <\u2029>
+//
+// So, <LF><CR> should be normalized to <LF><LF>.
+// However, the lexer should increment the line number only once for <LF><CR>.
+//
+// To achieve this, LineNumberAdder holds the current status of line terminator sequence.
+// When TemplateLiteral lexer encounters a line terminator, it notifies to LineNumberAdder.
+// LineNumberAdder maintains the status and increments the line number when it's necessary.
+// For example, LineNumberAdder increments the line number only once for <LF><CR> and <CR><LF>.
+template<typename CharacterType>
+class LineNumberAdder {
+public:
+ LineNumberAdder(int& lineNumber)
+ : m_lineNumber(lineNumber)
+ {
+ }
+
+ void clear()
+ {
+ m_previous = 0;
+ }
+
+ void add(CharacterType character)
+ {
+ ASSERT(Lexer<CharacterType>::isLineTerminator(character));
+ if ((character + m_previous) == ('\n' + '\r'))
+ m_previous = 0;
+ else {
+ ++m_lineNumber;
+ m_previous = character;
+ }
+ }
+
+private:
+ int& m_lineNumber;
+ CharacterType m_previous { 0 };
+};
+
+template <typename T>
+template <bool shouldBuildStrings> typename Lexer<T>::StringParseResult Lexer<T>::parseTemplateLiteral(JSTokenData* tokenData, RawStringsBuildMode rawStringsBuildMode)
+{
+ const T* stringStart = currentSourcePtr();
+ const T* rawStringStart = currentSourcePtr();
+
+ LineNumberAdder<T> lineNumberAdder(m_lineNumber);
+
+ while (m_current != '`') {
+ if (UNLIKELY(m_current == '\\')) {
+ lineNumberAdder.clear();
+ if (stringStart != currentSourcePtr() && shouldBuildStrings)
+ append16(stringStart, currentSourcePtr() - stringStart);
+ shift();
+
+ LChar escape = singleEscape(m_current);
+
+ // Most common escape sequences first.
+ if (escape) {
+ if (shouldBuildStrings)
+ record16(escape);
+ shift();
+ } else if (UNLIKELY(isLineTerminator(m_current))) {
+ if (m_current == '\r') {
+ lineNumberAdder.add(m_current);
+ shift();
+ if (m_current == '\n') {
+ lineNumberAdder.add(m_current);
+ shift();
+ }
+ } else {
+ lineNumberAdder.add(m_current);
+ shift();
+ }
+ } else {
+ bool strictMode = true;
+ StringParseResult result = parseComplexEscape<shouldBuildStrings>(EscapeParseMode::Template, strictMode, '`');
+ if (result != StringParsedSuccessfully)
+ return result;
+ }
+
+ stringStart = currentSourcePtr();
+ continue;
+ }
+
+ if (m_current == '$' && peek(1) == '{')
+ break;
+
+ // Fast check for characters that require special handling.
+ // Catches 0, \n, \r, 0x2028, and 0x2029 as efficiently
+ // as possible, and lets through all common ASCII characters.
+ if (UNLIKELY(((static_cast<unsigned>(m_current) - 0xE) & 0x2000))) {
+ // End of input is not allowed.
+ // Unlike String, line terminator is allowed.
+ if (atEnd()) {
+ m_lexErrorMessage = ASCIILiteral("Unexpected EOF");
+ return atEnd() ? StringUnterminated : StringCannotBeParsed;
+ }
+
+ if (isLineTerminator(m_current)) {
+ if (m_current == '\r') {
+ // Normalize <CR>, <CR><LF> to <LF>.
+ if (shouldBuildStrings) {
+ if (stringStart != currentSourcePtr())
+ append16(stringStart, currentSourcePtr() - stringStart);
+ if (rawStringStart != currentSourcePtr() && rawStringsBuildMode == RawStringsBuildMode::BuildRawStrings)
+ m_bufferForRawTemplateString16.append(rawStringStart, currentSourcePtr() - rawStringStart);
+
+ record16('\n');
+ if (rawStringsBuildMode == RawStringsBuildMode::BuildRawStrings)
+ m_bufferForRawTemplateString16.append('\n');
+ }
+ lineNumberAdder.add(m_current);
+ shift();
+ if (m_current == '\n') {
+ lineNumberAdder.add(m_current);
+ shift();
+ }
+ stringStart = currentSourcePtr();
+ rawStringStart = currentSourcePtr();
+ } else {
+ lineNumberAdder.add(m_current);
+ shift();
+ }
+ continue;
+ }
+ // Anything else is just a normal character
+ }
+
+ lineNumberAdder.clear();
+ shift();
+ }
+
+ bool isTail = m_current == '`';
+
+ if (shouldBuildStrings) {
+ if (currentSourcePtr() != stringStart)
+ append16(stringStart, currentSourcePtr() - stringStart);
+ if (rawStringStart != currentSourcePtr() && rawStringsBuildMode == RawStringsBuildMode::BuildRawStrings)
+ m_bufferForRawTemplateString16.append(rawStringStart, currentSourcePtr() - rawStringStart);
+ }
+
+ if (shouldBuildStrings) {
+ tokenData->cooked = makeIdentifier(m_buffer16.data(), m_buffer16.size());
+ // Line terminator normalization (e.g. <CR> => <LF>) should be applied to both the raw and cooked representations.
+ if (rawStringsBuildMode == RawStringsBuildMode::BuildRawStrings)
+ tokenData->raw = makeIdentifier(m_bufferForRawTemplateString16.data(), m_bufferForRawTemplateString16.size());
+ else
+ tokenData->raw = makeEmptyIdentifier();
+ } else {
+ tokenData->cooked = makeEmptyIdentifier();
+ tokenData->raw = makeEmptyIdentifier();
+ }
+ tokenData->isTail = isTail;
+
+ m_buffer16.shrink(0);
+ m_bufferForRawTemplateString16.shrink(0);
+
+ if (isTail) {
+ // Skip `
+ shift();
+ } else {
+ // Skip $ and {
+ shift();
+ shift();
+ }
+
+ return StringParsedSuccessfully;
+}
+#endif
+
template <typename T>
ALWAYS_INLINE void Lexer<T>::parseHex(double& returnValue)
{
uint32_t hexValue = 0;
int maximumDigits = 7;
- // Shift out the 'x' prefix.
- shift();
-
do {
hexValue = (hexValue << 4) + toASCIIHexValue(m_current);
shift();
returnValue = parseIntOverflow(m_buffer8.data(), m_buffer8.size(), 16);
}
+template <typename T>
+ALWAYS_INLINE bool Lexer<T>::parseBinary(double& returnValue)
+{
+ // Optimization: most binary values fit into 4 bytes.
+ uint32_t binaryValue = 0;
+ const unsigned maximumDigits = 32;
+ int digit = maximumDigits - 1;
+ // Temporary buffer for the digits. Makes easier
+ // to reconstruct the input characters when needed.
+ LChar digits[maximumDigits];
+
+ do {
+ binaryValue = (binaryValue << 1) + (m_current - '0');
+ digits[digit] = m_current;
+ shift();
+ --digit;
+ } while (isASCIIBinaryDigit(m_current) && digit >= 0);
+
+ if (!isASCIIDigit(m_current) && digit >= 0) {
+ returnValue = binaryValue;
+ return true;
+ }
+
+ for (int i = maximumDigits - 1; i > digit; --i)
+ record8(digits[i]);
+
+ while (isASCIIBinaryDigit(m_current)) {
+ record8(m_current);
+ shift();
+ }
+
+ if (isASCIIDigit(m_current))
+ return false;
+
+ returnValue = parseIntOverflow(m_buffer8.data(), m_buffer8.size(), 2);
+ return true;
+}
+
template <typename T>
ALWAYS_INLINE bool Lexer<T>::parseOctal(double& returnValue)
{
// Optimization: most octal values fit into 4 bytes.
uint32_t octalValue = 0;
- int maximumDigits = 9;
+ const unsigned maximumDigits = 10;
+ int digit = maximumDigits - 1;
// Temporary buffer for the digits. Makes easier
// to reconstruct the input characters when needed.
- LChar digits[10];
+ LChar digits[maximumDigits];
do {
octalValue = octalValue * 8 + (m_current - '0');
- digits[maximumDigits] = m_current;
+ digits[digit] = m_current;
shift();
- --maximumDigits;
- } while (isASCIIOctalDigit(m_current) && maximumDigits >= 0);
+ --digit;
+ } while (isASCIIOctalDigit(m_current) && digit >= 0);
- if (!isASCIIDigit(m_current) && maximumDigits >= 0) {
+ if (!isASCIIDigit(m_current) && digit >= 0) {
returnValue = octalValue;
return true;
}
- for (int i = 9; i > maximumDigits; --i)
+ for (int i = maximumDigits - 1; i > digit; --i)
record8(digits[i]);
while (isASCIIOctalDigit(m_current)) {
// Since parseOctal may be executed before parseDecimal,
// the m_buffer8 may hold ascii digits.
if (!m_buffer8.size()) {
- int maximumDigits = 9;
+ const unsigned maximumDigits = 10;
+ int digit = maximumDigits - 1;
// Temporary buffer for the digits. Makes easier
// to reconstruct the input characters when needed.
- LChar digits[10];
+ LChar digits[maximumDigits];
do {
decimalValue = decimalValue * 10 + (m_current - '0');
- digits[maximumDigits] = m_current;
+ digits[digit] = m_current;
shift();
- --maximumDigits;
- } while (isASCIIDigit(m_current) && maximumDigits >= 0);
+ --digit;
+ } while (isASCIIDigit(m_current) && digit >= 0);
- if (maximumDigits >= 0 && m_current != '.' && (m_current | 0x20) != 'e') {
+ if (digit >= 0 && m_current != '.' && (m_current | 0x20) != 'e') {
returnValue = decimalValue;
return true;
}
- for (int i = 9; i > maximumDigits; --i)
+ for (int i = maximumDigits - 1; i > digit; --i)
record8(digits[i]);
}
return code < m_codeEnd && *code == ':';
}
+#if ENABLE(ES6_ARROWFUNCTION_SYNTAX)
+template <typename T>
+void Lexer<T>::setTokenPosition(JSToken* tokenRecord)
+{
+ JSTokenData* tokenData = &tokenRecord->m_data;
+ tokenData->line = lineNumber();
+ tokenData->offset = currentOffset();
+ tokenData->lineStartOffset = currentLineStartOffset();
+ ASSERT(tokenData->offset >= tokenData->lineStartOffset);
+}
+#endif
+
template <typename T>
JSTokenType Lexer<T>::lex(JSToken* tokenRecord, unsigned lexerFlags, bool strictMode)
{
JSTokenData* tokenData = &tokenRecord->m_data;
JSTokenLocation* tokenLocation = &tokenRecord->m_location;
+ m_lastTockenLocation = JSTokenLocation(tokenRecord->m_location);
+
ASSERT(!m_error);
ASSERT(m_buffer8.isEmpty());
ASSERT(m_buffer16.isEmpty());
}
token = GT;
break;
- case CharacterEqual:
+ case CharacterEqual: {
+#if ENABLE(ES6_ARROWFUNCTION_SYNTAX)
+ if (peek(1) == '>') {
+ token = ARROWFUNCTION;
+ tokenData->line = lineNumber();
+ tokenData->offset = currentOffset();
+ tokenData->lineStartOffset = currentLineStartOffset();
+ ASSERT(tokenData->offset >= tokenData->lineStartOffset);
+ shift();
+ shift();
+ break;
+ }
+#endif
shift();
if (m_current == '=') {
shift();
}
token = EQUAL;
break;
+ }
case CharacterLess:
shift();
if (m_current == '!' && peek(1) == '-' && peek(2) == '-') {
shift();
if (parseMultilineComment())
goto start;
- m_lexErrorMessage = "Multiline comment was not closed properly";
+ m_lexErrorMessage = ASCIILiteral("Multiline comment was not closed properly");
token = UNTERMINATED_MULTILINE_COMMENT_ERRORTOK;
goto returnError;
}
shift();
if ((m_current | 0x20) == 'x') {
if (!isASCIIHexDigit(peek(1))) {
- m_lexErrorMessage = "No hexadecimal digits after '0x'";
+ m_lexErrorMessage = ASCIILiteral("No hexadecimal digits after '0x'");
token = INVALID_HEX_NUMBER_ERRORTOK;
goto returnError;
}
+
+ // Shift out the 'x' prefix.
+ shift();
+
parseHex(tokenData->doubleValue);
if (isIdentStart(m_current)) {
- m_lexErrorMessage = "No space between hexadecimal literal and identifier";
+ m_lexErrorMessage = ASCIILiteral("No space between hexadecimal literal and identifier");
token = INVALID_HEX_NUMBER_ERRORTOK;
goto returnError;
}
- token = NUMBER;
- m_buffer8.resize(0);
+ token = tokenTypeForIntegerLikeToken(tokenData->doubleValue);
+ m_buffer8.shrink(0);
+ break;
+ }
+ if ((m_current | 0x20) == 'b') {
+ if (!isASCIIBinaryDigit(peek(1))) {
+ m_lexErrorMessage = ASCIILiteral("No binary digits after '0b'");
+ token = INVALID_BINARY_NUMBER_ERRORTOK;
+ goto returnError;
+ }
+
+ // Shift out the 'b' prefix.
+ shift();
+
+ parseBinary(tokenData->doubleValue);
+ if (isIdentStart(m_current)) {
+ m_lexErrorMessage = ASCIILiteral("No space between binary literal and identifier");
+ token = INVALID_BINARY_NUMBER_ERRORTOK;
+ goto returnError;
+ }
+ token = tokenTypeForIntegerLikeToken(tokenData->doubleValue);
+ m_buffer8.shrink(0);
+ break;
+ }
+
+ if ((m_current | 0x20) == 'o') {
+ if (!isASCIIOctalDigit(peek(1))) {
+ m_lexErrorMessage = ASCIILiteral("No octal digits after '0o'");
+ token = INVALID_OCTAL_NUMBER_ERRORTOK;
+ goto returnError;
+ }
+
+ // Shift out the 'o' prefix.
+ shift();
+
+ parseOctal(tokenData->doubleValue);
+ if (isIdentStart(m_current)) {
+ m_lexErrorMessage = ASCIILiteral("No space between octal literal and identifier");
+ token = INVALID_OCTAL_NUMBER_ERRORTOK;
+ goto returnError;
+ }
+ token = tokenTypeForIntegerLikeToken(tokenData->doubleValue);
+ m_buffer8.shrink(0);
break;
}
record8('0');
+ if (strictMode && isASCIIDigit(m_current)) {
+ m_lexErrorMessage = ASCIILiteral("Decimal integer literals with a leading zero are forbidden in strict mode");
+ token = INVALID_OCTAL_NUMBER_ERRORTOK;
+ goto returnError;
+ }
if (isASCIIOctalDigit(m_current)) {
if (parseOctal(tokenData->doubleValue)) {
- if (strictMode) {
- m_lexErrorMessage = "Octal escapes are forbidden in strict mode";
- token = INVALID_OCTAL_NUMBER_ERRORTOK;
- goto returnError;
- }
- token = NUMBER;
+ token = tokenTypeForIntegerLikeToken(tokenData->doubleValue);
}
}
FALLTHROUGH;
case CharacterNumber:
- if (LIKELY(token != NUMBER)) {
+ if (LIKELY(token != INTEGER && token != DOUBLE)) {
if (!parseDecimal(tokenData->doubleValue)) {
+ token = INTEGER;
if (m_current == '.') {
shift();
inNumberAfterDecimalPoint:
parseNumberAfterDecimalPoint();
+ token = DOUBLE;
}
if ((m_current | 0x20) == 'e') {
if (!parseNumberAfterExponentIndicator()) {
- m_lexErrorMessage = "Non-number found after exponent indicator";
+ m_lexErrorMessage = ASCIILiteral("Non-number found after exponent indicator");
token = atEnd() ? UNTERMINATED_NUMERIC_LITERAL_ERRORTOK : INVALID_NUMERIC_LITERAL_ERRORTOK;
goto returnError;
}
}
size_t parsedLength;
tokenData->doubleValue = parseDouble(m_buffer8.data(), m_buffer8.size(), parsedLength);
- }
- token = NUMBER;
+ if (token == INTEGER)
+ token = tokenTypeForIntegerLikeToken(tokenData->doubleValue);
+ } else
+ token = tokenTypeForIntegerLikeToken(tokenData->doubleValue);
}
// No identifiers allowed directly after numeric literal, e.g. "3in" is bad.
if (UNLIKELY(isIdentStart(m_current))) {
- m_lexErrorMessage = "At least one digit must occur after a decimal point";
+ m_lexErrorMessage = ASCIILiteral("At least one digit must occur after a decimal point");
token = atEnd() ? UNTERMINATED_NUMERIC_LITERAL_ERRORTOK : INVALID_NUMERIC_LITERAL_ERRORTOK;
goto returnError;
}
- m_buffer8.resize(0);
+ m_buffer8.shrink(0);
break;
- case CharacterQuote:
- if (lexerFlags & LexerFlagsDontBuildStrings) {
- StringParseResult result = parseString<false>(tokenData, strictMode);
- if (UNLIKELY(result != StringParsedSuccessfully)) {
- token = result == StringUnterminated ? UNTERMINATED_STRING_LITERAL_ERRORTOK : INVALID_STRING_LITERAL_ERRORTOK;
- goto returnError;
- }
- } else {
- StringParseResult result = parseString<true>(tokenData, strictMode);
- if (UNLIKELY(result != StringParsedSuccessfully)) {
- token = result == StringUnterminated ? UNTERMINATED_STRING_LITERAL_ERRORTOK : INVALID_STRING_LITERAL_ERRORTOK;
- goto returnError;
- }
+ case CharacterQuote: {
+ StringParseResult result = StringCannotBeParsed;
+ if (lexerFlags & LexerFlagsDontBuildStrings)
+ result = parseString<false>(tokenData, strictMode);
+ else
+ result = parseString<true>(tokenData, strictMode);
+
+ if (UNLIKELY(result != StringParsedSuccessfully)) {
+ token = result == StringUnterminated ? UNTERMINATED_STRING_LITERAL_ERRORTOK : INVALID_STRING_LITERAL_ERRORTOK;
+ goto returnError;
}
shift();
token = STRING;
break;
+ }
+#if ENABLE(ES6_TEMPLATE_LITERAL_SYNTAX)
+ case CharacterBackQuote: {
+ // Skip backquote.
+ shift();
+ StringParseResult result = StringCannotBeParsed;
+ if (lexerFlags & LexerFlagsDontBuildStrings)
+ result = parseTemplateLiteral<false>(tokenData, RawStringsBuildMode::BuildRawStrings);
+ else
+ result = parseTemplateLiteral<true>(tokenData, RawStringsBuildMode::BuildRawStrings);
+
+ if (UNLIKELY(result != StringParsedSuccessfully)) {
+ token = result == StringUnterminated ? UNTERMINATED_TEMPLATE_LITERAL_ERRORTOK : INVALID_TEMPLATE_LITERAL_ERRORTOK;
+ goto returnError;
+ }
+ token = TEMPLATE;
+ break;
+ }
+#endif
case CharacterIdentifierStart:
ASSERT(isIdentStart(m_current));
FALLTHROUGH;
goto returnError;
default:
RELEASE_ASSERT_NOT_REACHED();
- m_lexErrorMessage = "Internal Error";
+ m_lexErrorMessage = ASCIILiteral("Internal Error");
token = ERRORTOK;
goto returnError;
}
while (true) {
if (isLineTerminator(m_current) || atEnd()) {
- m_buffer16.resize(0);
+ m_buffer16.shrink(0);
return false;
}
pattern = makeRightSizedIdentifier(m_buffer16.data(), m_buffer16.size(), charactersOredTogether);
- m_buffer16.resize(0);
+ m_buffer16.shrink(0);
charactersOredTogether = 0;
while (isIdentPart(m_current)) {
}
flags = makeRightSizedIdentifier(m_buffer16.data(), m_buffer16.size(), charactersOredTogether);
- m_buffer16.resize(0);
+ m_buffer16.shrink(0);
return true;
}
return true;
}
+#if ENABLE(ES6_TEMPLATE_LITERAL_SYNTAX)
+template <typename T>
+JSTokenType Lexer<T>::scanTrailingTemplateString(JSToken* tokenRecord, RawStringsBuildMode rawStringsBuildMode)
+{
+ JSTokenData* tokenData = &tokenRecord->m_data;
+ JSTokenLocation* tokenLocation = &tokenRecord->m_location;
+ ASSERT(!m_error);
+ ASSERT(m_buffer16.isEmpty());
+
+ // Leading closing brace } is already shifted in the previous token scan.
+ // So in this re-scan phase, shift() is not needed here.
+ StringParseResult result = parseTemplateLiteral<true>(tokenData, rawStringsBuildMode);
+ JSTokenType token = ERRORTOK;
+ if (UNLIKELY(result != StringParsedSuccessfully)) {
+ token = result == StringUnterminated ? UNTERMINATED_TEMPLATE_LITERAL_ERRORTOK : INVALID_TEMPLATE_LITERAL_ERRORTOK;
+ m_error = true;
+ } else {
+ token = TEMPLATE;
+ m_lastToken = token;
+ }
+
+ // Since TemplateString always ends with ` or }, m_atLineStart always becomes false.
+ m_atLineStart = false;
+
+ // Adjust current tokenLocation data for TemplateString.
+ tokenLocation->line = m_lineNumber;
+ tokenLocation->endOffset = currentOffset();
+ tokenLocation->lineStartOffset = currentLineStartOffset();
+ ASSERT(tokenLocation->endOffset >= tokenLocation->lineStartOffset);
+ tokenRecord->m_endPosition = currentPosition();
+ return token;
+}
+#endif
+
template <typename T>
void Lexer<T>::clear()
{
Vector<UChar> newBuffer16;
m_buffer16.swap(newBuffer16);
+ Vector<UChar> newBufferForRawTemplateString16;
+ m_bufferForRawTemplateString16.swap(newBufferForRawTemplateString16);
+
m_isReparsing = false;
}
projects / apple / javascriptcore.git / blobdiff