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LibJS: Add operator precedence parsing

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Obey precedence and associativity rules when parsing expressions
with chained operators.
This commit is contained in:
Stephan Unverwerth 2020-03-12 23:02:41 +01:00 • committed by Andreas Kling
parent f347dd5c5e
commit 15d5b2d29e
8 changed files with 281 additions and 53 deletions
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26
Libraries/LibJS/Token.h
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@ -35,10 +35,13 @@ enum class TokenType {
Ampersand,
AmpersandEquals,
Asterisk,
AsteriskAsteriskEquals,
AsteriskEquals,
Await,
BoolLiteral,
BracketClose,
BracketOpen,
Caret,
Catch,
Class,
Comma,
@ -48,7 +51,9 @@ enum class TokenType {
Delete,
Do,
DoubleAmpersand,
DoubleAsterisk,
DoublePipe,
DoubleQuestionMark,
Else,
Eof,
Equals,
@ -64,6 +69,8 @@ enum class TokenType {
GreaterThanEquals,
Identifier,
If,
In,
Instanceof,
Interface,
Invalid,
LessThan,
@ -86,17 +93,26 @@ enum class TokenType {
PlusEquals,
PlusPlus,
QuestionMark,
QuestionMarkPeriod,
RegexLiteral,
Return,
Semicolon,
ShiftLeft,
ShiftLeftEquals,
ShiftRight,
ShiftRightEquals,
Slash,
SlashEquals,
StringLiteral,
Tilde,
Try,
Typeof,
UnsignedShiftRight,
UnsignedShiftRightEquals,
Var,
While
Void,
While,
Yield,
};
class Token {
@ -125,3 +141,11 @@ private:
};
}
namespace AK {
template<>
struct Traits<JS::TokenType> : public GenericTraits<JS::TokenType> {
static constexpr bool is_trivial() { return true; }
static unsigned hash(JS::TokenType t) { return int_hash((int)t); }
};
}