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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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12
Libraries/LibJS/Parser.h
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@ -31,6 +31,12 @@
#include <AK/NonnullOwnPtr.h>
namespace JS {
enum class Associativity {
Left,
Right
};
class Parser {
public:
explicit Parser(Lexer lexer);
@ -44,15 +50,17 @@ public:
NonnullOwnPtr<VariableDeclaration> parse_variable_declaration();
NonnullOwnPtr<ForStatement> parse_for_statement();
NonnullOwnPtr<Expression> parse_expression();
NonnullOwnPtr<Expression> parse_expression(int min_precedence, Associativity associate = Associativity::Right);
NonnullOwnPtr<Expression> parse_primary_expression();
NonnullOwnPtr<ObjectExpression> parse_object_expression();
NonnullOwnPtr<Expression> parse_secondary_expression(NonnullOwnPtr<Expression>);
NonnullOwnPtr<Expression> parse_secondary_expression(NonnullOwnPtr<Expression>, int min_precedence, Associativity associate = Associativity::Right);
NonnullOwnPtr<CallExpression> parse_call_expression(NonnullOwnPtr<Expression>);
bool has_errors() const { return m_has_errors; }
private:
int operator_precedence(TokenType) const;
Associativity operator_associativity(TokenType) const;
bool match_expression() const;
bool match_secondary_expression() const;
bool match_statement() const;