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https://github.com/RGBCube/serenity
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4fb96afafc
https://tc39.es/ecma262/#sec-additional-syntax-string-literals The syntax and semantics of 11.8.4 is extended as follows except that this extension is not allowed for strict mode code: Syntax EscapeSequence:: CharacterEscapeSequence LegacyOctalEscapeSequence NonOctalDecimalEscapeSequence HexEscapeSequence UnicodeEscapeSequence LegacyOctalEscapeSequence:: OctalDigit [lookahead ∉ OctalDigit] ZeroToThree OctalDigit [lookahead ∉ OctalDigit] FourToSeven OctalDigit ZeroToThree OctalDigit OctalDigit ZeroToThree :: one of 0 1 2 3 FourToSeven :: one of 4 5 6 7 NonOctalDecimalEscapeSequence :: one of 8 9 This definition of EscapeSequence is not used in strict mode or when parsing TemplateCharacter. Note It is possible for string literals to precede a Use Strict Directive that places the enclosing code in strict mode, and implementations must take care to not use this extended definition of EscapeSequence with such literals. For example, attempting to parse the following source text must fail: function invalid() { "\7"; "use strict"; }
226 lines
11 KiB
C++
226 lines
11 KiB
C++
/*
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* Copyright (c) 2020, Stephan Unverwerth <s.unverwerth@gmx.de>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/String.h>
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#include <AK/StringView.h>
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namespace JS {
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// U+2028 LINE SEPARATOR
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constexpr const char line_separator_chars[] { (char)0xe2, (char)0x80, (char)0xa8, 0 };
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constexpr const StringView LINE_SEPARATOR { line_separator_chars };
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// U+2029 PARAGRAPH SEPARATOR
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constexpr const char paragraph_separator_chars[] { (char)0xe2, (char)0x80, (char)0xa9, 0 };
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constexpr const StringView PARAGRAPH_SEPARATOR { paragraph_separator_chars };
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#define ENUMERATE_JS_TOKENS \
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__ENUMERATE_JS_TOKEN(Ampersand, Operator) \
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__ENUMERATE_JS_TOKEN(AmpersandEquals, Operator) \
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__ENUMERATE_JS_TOKEN(Arrow, Operator) \
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__ENUMERATE_JS_TOKEN(Asterisk, Operator) \
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__ENUMERATE_JS_TOKEN(AsteriskEquals, Operator) \
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__ENUMERATE_JS_TOKEN(Async, Keyword) \
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__ENUMERATE_JS_TOKEN(Await, Keyword) \
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__ENUMERATE_JS_TOKEN(BigIntLiteral, Number) \
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__ENUMERATE_JS_TOKEN(BoolLiteral, Keyword) \
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__ENUMERATE_JS_TOKEN(BracketClose, Punctuation) \
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__ENUMERATE_JS_TOKEN(BracketOpen, Punctuation) \
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__ENUMERATE_JS_TOKEN(Break, Keyword) \
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__ENUMERATE_JS_TOKEN(Caret, Operator) \
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__ENUMERATE_JS_TOKEN(CaretEquals, Operator) \
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__ENUMERATE_JS_TOKEN(Case, ControlKeyword) \
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__ENUMERATE_JS_TOKEN(Catch, ControlKeyword) \
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__ENUMERATE_JS_TOKEN(Class, Keyword) \
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__ENUMERATE_JS_TOKEN(Colon, Punctuation) \
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__ENUMERATE_JS_TOKEN(Comma, Punctuation) \
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__ENUMERATE_JS_TOKEN(Const, Keyword) \
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__ENUMERATE_JS_TOKEN(Continue, ControlKeyword) \
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__ENUMERATE_JS_TOKEN(CurlyClose, Punctuation) \
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__ENUMERATE_JS_TOKEN(CurlyOpen, Punctuation) \
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__ENUMERATE_JS_TOKEN(Debugger, Keyword) \
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__ENUMERATE_JS_TOKEN(Default, ControlKeyword) \
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__ENUMERATE_JS_TOKEN(Delete, Keyword) \
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__ENUMERATE_JS_TOKEN(Do, ControlKeyword) \
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__ENUMERATE_JS_TOKEN(DoubleAmpersand, Operator) \
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__ENUMERATE_JS_TOKEN(DoubleAmpersandEquals, Operator) \
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__ENUMERATE_JS_TOKEN(DoubleAsterisk, Operator) \
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__ENUMERATE_JS_TOKEN(DoubleAsteriskEquals, Operator) \
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__ENUMERATE_JS_TOKEN(DoublePipe, Operator) \
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__ENUMERATE_JS_TOKEN(DoublePipeEquals, Operator) \
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__ENUMERATE_JS_TOKEN(DoubleQuestionMark, Operator) \
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__ENUMERATE_JS_TOKEN(DoubleQuestionMarkEquals, Operator) \
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__ENUMERATE_JS_TOKEN(Else, ControlKeyword) \
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__ENUMERATE_JS_TOKEN(Enum, Keyword) \
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__ENUMERATE_JS_TOKEN(Eof, Invalid) \
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__ENUMERATE_JS_TOKEN(Equals, Operator) \
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__ENUMERATE_JS_TOKEN(EqualsEquals, Operator) \
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__ENUMERATE_JS_TOKEN(EqualsEqualsEquals, Operator) \
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__ENUMERATE_JS_TOKEN(ExclamationMark, Operator) \
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__ENUMERATE_JS_TOKEN(ExclamationMarkEquals, Operator) \
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__ENUMERATE_JS_TOKEN(ExclamationMarkEqualsEquals, Operator) \
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__ENUMERATE_JS_TOKEN(Export, Keyword) \
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__ENUMERATE_JS_TOKEN(Extends, Keyword) \
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__ENUMERATE_JS_TOKEN(Finally, ControlKeyword) \
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__ENUMERATE_JS_TOKEN(For, ControlKeyword) \
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__ENUMERATE_JS_TOKEN(Function, Keyword) \
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__ENUMERATE_JS_TOKEN(GreaterThan, Operator) \
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__ENUMERATE_JS_TOKEN(GreaterThanEquals, Operator) \
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__ENUMERATE_JS_TOKEN(Identifier, Identifier) \
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__ENUMERATE_JS_TOKEN(If, ControlKeyword) \
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__ENUMERATE_JS_TOKEN(Implements, Keyword) \
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__ENUMERATE_JS_TOKEN(Import, Keyword) \
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__ENUMERATE_JS_TOKEN(In, Keyword) \
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__ENUMERATE_JS_TOKEN(Instanceof, Keyword) \
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__ENUMERATE_JS_TOKEN(Interface, Keyword) \
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__ENUMERATE_JS_TOKEN(Invalid, Invalid) \
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__ENUMERATE_JS_TOKEN(LessThan, Operator) \
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__ENUMERATE_JS_TOKEN(LessThanEquals, Operator) \
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__ENUMERATE_JS_TOKEN(Let, Keyword) \
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__ENUMERATE_JS_TOKEN(Minus, Operator) \
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__ENUMERATE_JS_TOKEN(MinusEquals, Operator) \
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__ENUMERATE_JS_TOKEN(MinusMinus, Operator) \
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__ENUMERATE_JS_TOKEN(New, Keyword) \
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__ENUMERATE_JS_TOKEN(NullLiteral, Keyword) \
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__ENUMERATE_JS_TOKEN(NumericLiteral, Number) \
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__ENUMERATE_JS_TOKEN(Package, Keyword) \
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__ENUMERATE_JS_TOKEN(ParenClose, Punctuation) \
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__ENUMERATE_JS_TOKEN(ParenOpen, Punctuation) \
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__ENUMERATE_JS_TOKEN(Percent, Operator) \
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__ENUMERATE_JS_TOKEN(PercentEquals, Operator) \
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__ENUMERATE_JS_TOKEN(Period, Operator) \
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__ENUMERATE_JS_TOKEN(Pipe, Operator) \
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__ENUMERATE_JS_TOKEN(PipeEquals, Operator) \
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__ENUMERATE_JS_TOKEN(Plus, Operator) \
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__ENUMERATE_JS_TOKEN(PlusEquals, Operator) \
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__ENUMERATE_JS_TOKEN(PlusPlus, Operator) \
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__ENUMERATE_JS_TOKEN(Private, Keyword) \
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__ENUMERATE_JS_TOKEN(Protected, Keyword) \
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__ENUMERATE_JS_TOKEN(Public, Keyword) \
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__ENUMERATE_JS_TOKEN(QuestionMark, Operator) \
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__ENUMERATE_JS_TOKEN(QuestionMarkPeriod, Operator) \
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__ENUMERATE_JS_TOKEN(RegexFlags, String) \
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__ENUMERATE_JS_TOKEN(RegexLiteral, String) \
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__ENUMERATE_JS_TOKEN(Return, ControlKeyword) \
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__ENUMERATE_JS_TOKEN(Semicolon, Punctuation) \
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__ENUMERATE_JS_TOKEN(ShiftLeft, Operator) \
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__ENUMERATE_JS_TOKEN(ShiftLeftEquals, Operator) \
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__ENUMERATE_JS_TOKEN(ShiftRight, Operator) \
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__ENUMERATE_JS_TOKEN(ShiftRightEquals, Operator) \
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__ENUMERATE_JS_TOKEN(Slash, Operator) \
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__ENUMERATE_JS_TOKEN(SlashEquals, Operator) \
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__ENUMERATE_JS_TOKEN(Static, Keyword) \
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__ENUMERATE_JS_TOKEN(StringLiteral, String) \
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__ENUMERATE_JS_TOKEN(Super, Keyword) \
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__ENUMERATE_JS_TOKEN(Switch, ControlKeyword) \
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__ENUMERATE_JS_TOKEN(TemplateLiteralEnd, String) \
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__ENUMERATE_JS_TOKEN(TemplateLiteralExprEnd, Punctuation) \
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__ENUMERATE_JS_TOKEN(TemplateLiteralExprStart, Punctuation) \
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__ENUMERATE_JS_TOKEN(TemplateLiteralStart, String) \
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__ENUMERATE_JS_TOKEN(TemplateLiteralString, String) \
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__ENUMERATE_JS_TOKEN(This, Keyword) \
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__ENUMERATE_JS_TOKEN(Throw, ControlKeyword) \
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__ENUMERATE_JS_TOKEN(Tilde, Operator) \
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__ENUMERATE_JS_TOKEN(TripleDot, Operator) \
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__ENUMERATE_JS_TOKEN(Try, ControlKeyword) \
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__ENUMERATE_JS_TOKEN(Typeof, Keyword) \
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__ENUMERATE_JS_TOKEN(UnsignedShiftRight, Operator) \
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__ENUMERATE_JS_TOKEN(UnsignedShiftRightEquals, Operator) \
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__ENUMERATE_JS_TOKEN(UnterminatedRegexLiteral, String) \
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__ENUMERATE_JS_TOKEN(UnterminatedStringLiteral, String) \
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__ENUMERATE_JS_TOKEN(UnterminatedTemplateLiteral, String) \
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__ENUMERATE_JS_TOKEN(Var, Keyword) \
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__ENUMERATE_JS_TOKEN(Void, Keyword) \
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__ENUMERATE_JS_TOKEN(While, ControlKeyword) \
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__ENUMERATE_JS_TOKEN(With, ControlKeyword) \
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__ENUMERATE_JS_TOKEN(Yield, ControlKeyword)
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enum class TokenType {
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#define __ENUMERATE_JS_TOKEN(type, category) type,
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ENUMERATE_JS_TOKENS
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#undef __ENUMERATE_JS_TOKEN
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_COUNT_OF_TOKENS
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};
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constexpr size_t cs_num_of_js_tokens = static_cast<size_t>(TokenType::_COUNT_OF_TOKENS);
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enum class TokenCategory {
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Invalid,
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Number,
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String,
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Punctuation,
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Operator,
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Keyword,
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ControlKeyword,
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Identifier
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};
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class Token {
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public:
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Token(TokenType type, StringView trivia, StringView value, size_t line_number, size_t line_column)
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: m_type(type)
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, m_trivia(trivia)
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, m_value(value)
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, m_line_number(line_number)
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, m_line_column(line_column)
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{
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}
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TokenType type() const { return m_type; }
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TokenCategory category() const;
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static TokenCategory category(TokenType);
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const char* name() const;
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static const char* name(TokenType);
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const StringView& trivia() const { return m_trivia; }
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const StringView& value() const { return m_value; }
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size_t line_number() const { return m_line_number; }
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size_t line_column() const { return m_line_column; }
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double double_value() const;
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bool bool_value() const;
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enum class StringValueStatus {
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Ok,
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MalformedHexEscape,
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MalformedUnicodeEscape,
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UnicodeEscapeOverflow,
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LegacyOctalEscapeSequence,
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};
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String string_value(StringValueStatus& status) const;
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bool is_identifier_name() const;
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bool trivia_contains_line_terminator() const;
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private:
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TokenType m_type;
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StringView m_trivia;
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StringView m_value;
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size_t m_line_number;
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size_t m_line_column;
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};
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}
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