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//! This module implements various structure for logic handling. use crate::gc::{empty_trace, Finalize, Trace}; use std::fmt::{Display, Formatter, Result}; #[cfg(feature = "deser")] use serde::{Deserialize, Serialize}; /// Arithmetic operators take numerical values (either literals or variables) /// as their operands and return a single numerical value. /// /// More information: /// - [MDN documentation][mdn] /// /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators#Arithmetic #[cfg_attr(feature = "deser", derive(Serialize, Deserialize))] #[derive(Clone, Copy, Debug, Finalize, PartialEq)] pub enum NumOp { /// The addition operator produces the sum of numeric operands or string concatenation. /// /// Syntax: `x + y` /// /// More information: /// - [ECMAScript reference][spec]. /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#sec-addition-operator-plus /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators#Addition Add, /// The subtraction operator subtracts the two operands, producing their difference. /// /// Syntax: `x - y` /// /// More information: /// - [ECMAScript reference][spec]. /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#sec-subtraction-operator-minus /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators#Subtraction Sub, /// The division operator produces the quotient of its operands where the left operand /// is the dividend and the right operand is the divisor. /// /// Syntax: `x / y` /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-MultiplicativeOperator /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators#Division Div, /// The multiplication operator produces the product of the operands. /// /// Syntax: `x * y` /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-MultiplicativeExpression /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators#Multiplication Mul, /// The exponentiation operator returns the result of raising the first operand to /// the power of the second operand. /// /// Syntax: `x ** y` /// /// The exponentiation operator is right-associative. a ** b ** c is equal to a ** (b ** c). /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#sec-exp-operator /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators#Exponentiation Exp, /// The remainder operator returns the remainder left over when one operand is divided by a second operand. /// /// Syntax: `x % y` /// /// The remainder operator always takes the sign of the dividend. /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-MultiplicativeOperator /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators#Remainder Mod, } impl Display for NumOp { fn fmt(&self, f: &mut Formatter<'_>) -> Result { write!( f, "{}", match *self { Self::Add => "+", Self::Sub => "-", Self::Div => "/", Self::Mul => "*", Self::Exp => "**", Self::Mod => "%", } ) } } unsafe impl Trace for NumOp { empty_trace!(); } /// A unary operator is one that takes a single operand/argument and performs an operation. /// /// A unary operation is an operation with only one operand. This operand comes either /// before or after the operator. Unary operators are more efficient than standard JavaScript /// function calls. /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-UnaryExpression /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators#Unary #[cfg_attr(feature = "deser", derive(Serialize, Deserialize))] #[derive(Clone, Copy, Debug, Finalize, PartialEq)] pub enum UnaryOp { /// The increment operator increments (adds one to) its operand and returns a value. /// /// Syntax: `++x` /// /// This operator increments and returns the value after incrementing. /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#sec-postfix-increment-operator /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators#Increment IncrementPost, /// The increment operator increments (adds one to) its operand and returns a value. /// /// Syntax: `x++` /// /// This operator increments and returns the value before incrementing. /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#sec-prefix-increment-operator /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators#Increment IncrementPre, /// The decrement operator decrements (subtracts one from) its operand and returns a value. /// /// Syntax: `--x` /// /// This operator decrements and returns the value before decrementing. /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#sec-postfix-decrement-operator /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators#Decrement DecrementPost, /// The decrement operator decrements (subtracts one from) its operand and returns a value. /// /// Syntax: `x--` /// /// This operator decrements the operand and returns the value after decrementing. /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#sec-prefix-decrement-operator /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators#Decrement DecrementPre, /// The unary negation operator precedes its operand and negates it. /// /// Syntax: `-x` /// /// Converts non-numbers data types to numbers like unary plus, /// however, it performs an additional operation, negation. /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#sec-unary-minus-operator /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators#Unary_negation Minus, /// The unary plus operator attempts to convert the operand into a number, if it isn't already. /// /// Syntax: `+x` /// /// Although unary negation (`-`) also can convert non-numbers, unary plus is the fastest and preferred /// way of converting something into a number, because it does not perform any other operations on the number. /// It can convert `string` representations of integers and floats, as well as the non-string values `true`, `false`, and `null`. /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#sec-unary-plus-operator /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators#Unary_plus Plus, /// Returns `false` if its single operand can be converted to `true`; otherwise, returns `true`. /// /// Syntax: `!x` /// /// Boolean values simply get inverted: `!true === false` and `!false === true`. /// Non-boolean values get converted to boolean values first, then are negated. /// This means that it is possible to use a couple of NOT operators in series to explicitly /// force the conversion of any value to the corresponding boolean primitive. /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#sec-logical-not-operator /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Logical_Operators#Logical_NOT Not, /// Performs the NOT operator on each bit. /// /// Syntax: `~x` /// /// NOT `a` yields the inverted value (or one's complement) of `a`. /// Bitwise NOTing any number x yields -(x + 1). For example, ~-5 yields 4. /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#sec-bitwise-not-operator /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_Operators#Bitwise_NOT Tilde, /// The `typeof` operator returns a string indicating the type of the unevaluated operand. /// /// Syntax: `typeof x` or `typeof(x)` /// /// The `typeof` is a JavaScript keyword that will return the type of a variable when you call it. /// You can use this to validate function parameters or check if variables are defined. /// There are other uses as well. /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#sec-typeof-operator /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/typeof TypeOf, /// The JavaScript `delete` operator removes a property from an object. /// /// Syntax: `delete x` /// /// Unlike what common belief suggests, the delete operator has nothing to do with /// directly freeing memory. Memory management is done indirectly via breaking references. /// If no more references to the same property are held, it is eventually released automatically. /// /// The `delete` operator returns `true` for all cases except when the property is an /// [own](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty) /// [non-configurable](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Cant_delete) /// property, in which case, `false` is returned in non-strict mode. /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#sec-delete-operator /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/delete Delete, /// The `void` operator evaluates the given `expression` and then returns `undefined`. /// /// Syntax: `void x` /// /// This operator allows evaluating expressions that produce a value into places where an /// expression that evaluates to `undefined` is desired. /// The `void` operator is often used merely to obtain the `undefined` primitive value, usually using `void(0)` /// (which is equivalent to `void 0`). In these cases, the global variable undefined can be used. /// /// When using an [immediately-invoked function expression](https://developer.mozilla.org/en-US/docs/Glossary/IIFE), /// `void` can be used to force the function keyword to be treated as an expression instead of a declaration. /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#sec-void-operator /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/void Void, } impl Display for UnaryOp { fn fmt(&self, f: &mut Formatter<'_>) -> Result { write!( f, "{}", match *self { Self::IncrementPost | Self::IncrementPre => "++", Self::DecrementPost | Self::DecrementPre => "--", Self::Plus => "+", Self::Minus => "-", Self::Not => "!", Self::Tilde => "~", Self::Delete => "delete", Self::TypeOf => "typeof", Self::Void => "void", } ) } } unsafe impl Trace for UnaryOp { empty_trace!(); } /// A bitwise operator is an operator used to perform bitwise operations /// on bit patterns or binary numerals that involve the manipulation of individual bits. /// /// More information: /// - [MDN documentation][mdn] /// /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators#Bitwise #[cfg_attr(feature = "deser", derive(Serialize, Deserialize))] #[derive(Clone, Copy, Debug, Finalize, PartialEq)] pub enum BitOp { /// Performs the AND operation on each pair of bits. a AND b yields 1 only if both a and b are 1. /// /// Syntax: `x & y` /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-BitwiseANDExpression /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_Operators#Bitwise_AND And, /// Performs the OR operation on each pair of bits. a OR b yields 1 if either a or b is 1. /// /// Syntax: `x | y` /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-BitwiseORExpression /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_Operators#Bitwise_OR Or, /// Performs the XOR operation on each pair of bits. a XOR b yields 1 if a and b are different. /// /// Syntax: `x ^ y` /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-BitwiseXORExpression /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_Operators#Bitwise_XOR Xor, /// This operator shifts the first operand the specified number of bits to the left. /// /// Syntax: `x << y` /// /// Excess bits shifted off to the left are discarded. Zero bits are shifted in from the right. /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#sec-left-shift-operator /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_Operators#Left_shift Shl, /// This operator shifts the first operand the specified number of bits to the right. /// /// Syntax: `x >> y` /// /// Excess bits shifted off to the right are discarded. Copies of the leftmost bit /// are shifted in from the left. Since the new leftmost bit has the same value as /// the previous leftmost bit, the sign bit (the leftmost bit) does not change. /// Hence the name "sign-propagating". /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#sec-signed-right-shift-operator /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_Operators#Right_shift Shr, /// This operator shifts the first operand the specified number of bits to the right. /// /// Syntax: `x >>> y` /// /// Excess bits shifted off to the right are discarded. Zero bits are shifted in /// from the left. The sign bit becomes 0, so the result is always non-negative. /// Unlike the other bitwise operators, zero-fill right shift returns an unsigned 32-bit integer. /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#sec-unsigned-right-shift-operator /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_Operators#Unsigned_right_shift UShr, } impl Display for BitOp { fn fmt(&self, f: &mut Formatter<'_>) -> Result { write!( f, "{}", match *self { Self::And => "&", Self::Or => "|", Self::Xor => "^", Self::Shl => "<<", Self::Shr => ">>", Self::UShr => ">>>", } ) } } unsafe impl Trace for BitOp { empty_trace!(); } /// A comparison operator compares its operands and returns a logical value based on whether the comparison is true. /// /// The operands can be numerical, string, logical, or object values. Strings are compared based on standard /// lexicographical ordering, using Unicode values. In most cases, if the two operands are not of the same type, /// JavaScript attempts to convert them to an appropriate type for the comparison. This behavior generally results in /// comparing the operands numerically. The sole exceptions to type conversion within comparisons involve the `===` and `!==` /// operators, which perform strict equality and inequality comparisons. These operators do not attempt to convert the operands /// to compatible types before checking equality. /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: tc39.es/ecma262/#sec-testing-and-comparison-operations /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators#Comparison #[cfg_attr(feature = "deser", derive(Serialize, Deserialize))] #[derive(Clone, Copy, Debug, Finalize, PartialEq)] pub enum CompOp { /// The equality operator converts the operands if they are not of the same type, then applies /// strict comparison. /// /// Syntax: `y == y` /// /// If both operands are objects, then JavaScript compares internal references which are equal /// when operands refer to the same object in memory. /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#sec-abstract-equality-comparison /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Comparison_Operators#Equality Equal, /// The inequality operator returns `true` if the operands are not equal. /// /// Syntax: `x != y` /// /// If the two operands are not of the same type, JavaScript attempts to convert the operands /// to an appropriate type for the comparison. If both operands are objects, then JavaScript /// compares internal references which are not equal when operands refer to different objects /// in memory. /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-EqualityExpression /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Comparison_Operators#Inequality NotEqual, /// The identity operator returns `true` if the operands are strictly equal **with no type /// conversion**. /// /// Syntax: `x === y` /// /// Returns `true` if the operands are equal and of the same type. /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#sec-strict-equality-comparison /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Comparison_Operators#Identity StrictEqual, /// The non-identity operator returns `true` if the operands **are not equal and/or not of the /// same type**. /// /// Syntax: `x !== y` /// /// Returns `true` if the operands are of the same type but not equal, or are of different type. /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-EqualityExpression /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Comparison_Operators#Nonidentity> StrictNotEqual, /// The greater than operator returns `true` if the left operand is greater than the right /// operand. /// /// Syntax: `x > y` /// /// Returns `true` if the left operand is greater than the right operand. /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-RelationalExpression /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Comparison_Operators#Greater_than_operator GreaterThan, /// The greater than or equal operator returns `true` if the left operand is greater than or /// equal to the right operand. /// /// Syntax: `x >= y` /// /// Returns `true` if the left operand is greater than the right operand. /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-RelationalExpression /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Comparison_Operators#Greater_than_operator GreaterThanOrEqual, /// The less than operator returns `true` if the left operand is less than the right operand. /// /// Syntax: `x < y` /// /// Returns `true` if the left operand is less than the right operand. /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-RelationalExpression /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Comparison_Operators#Less_than_operator LessThan, /// The less than or equal operator returns `true` if the left operand is less than or equal to /// the right operand. /// /// Syntax: `x <= y` /// /// Returns `true` if the left operand is less than or equal to the right operand. /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-RelationalExpression /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Comparison_Operators#Less_than_or_equal_operator LessThanOrEqual, /// The `in` operator returns `true` if the specified property is in the specified object or /// its prototype chain. /// /// Syntax: `prop in object` /// /// Returns `true` the specified property is in the specified object or its prototype chain. /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-RelationalExpression /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/in In, /// The `instanceof` operator returns `true` if the specified object is an instance of the /// right hand side object. /// /// Syntax: `obj instanceof Object` /// /// Returns `true` the `prototype` property of the right hand side constructor appears anywhere /// in the prototype chain of the object. /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-RelationalExpression /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/instanceof InstanceOf, } impl Display for CompOp { fn fmt(&self, f: &mut Formatter<'_>) -> Result { write!( f, "{}", match *self { Self::Equal => "==", Self::NotEqual => "!=", Self::StrictEqual => "===", Self::StrictNotEqual => "!==", Self::GreaterThan => ">", Self::GreaterThanOrEqual => ">=", Self::LessThan => "<", Self::LessThanOrEqual => "<=", Self::In => "in", Self::InstanceOf => "instanceof", } ) } } unsafe impl Trace for CompOp { empty_trace!(); } /// Logical operators are typically used with Boolean (logical) values; when they are, they return a Boolean value. /// /// However, the `&&` and `||` operators actually return the value of one of the specified operands, /// so if these operators are used with non-Boolean values, they may return a non-Boolean value. /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#sec-binary-logical-operators /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators#Logical #[cfg_attr(feature = "deser", derive(Serialize, Deserialize))] #[derive(Clone, Copy, Debug, Finalize, PartialEq)] pub enum LogOp { /// The logical AND operator returns the value of the first operand if it can be coerced into `false`; /// otherwise, it returns the second operand. /// /// Syntax: `x && y` /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-LogicalANDExpression /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Logical_Operators#Logical_AND And, /// The logical OR operator returns the value the first operand if it can be coerced into `true`; /// otherwise, it returns the second operand. /// /// Syntax: `x || y` /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-LogicalORExpression /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Logical_Operators#Logical_OR Or, /// The nullish coalescing operator is a logical operator that returns the second operand /// when its first operand is null or undefined, and otherwise returns its first operand. /// /// Syntax: `x ?? y` /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-CoalesceExpression /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Nullish_coalescing_operator Coalesce, } impl Display for LogOp { fn fmt(&self, f: &mut Formatter<'_>) -> Result { write!( f, "{}", match *self { Self::And => "&&", Self::Or => "||", Self::Coalesce => "??", } ) } } unsafe impl Trace for LogOp { empty_trace!(); } /// This represents a binary operation between two values. #[cfg_attr(feature = "deser", derive(Serialize, Deserialize))] #[derive(Clone, Copy, Debug, Finalize, PartialEq)] pub enum BinOp { /// Numeric operation. /// /// see: [`NumOp`](enum.NumOp.html) Num(NumOp), /// Bitwise operation. /// /// see: [`BitOp`](enum.BitOp.html). Bit(BitOp), /// Comparitive operation. /// /// see: [`CompOp`](enum.CompOp.html). Comp(CompOp), /// Logical operation. /// /// see: [`LogOp`](enum.LogOp.html). Log(LogOp), /// Assign operation. /// /// see: [`AssignOp`](enum.AssignOp.html). Assign(AssignOp), /// Comma operation. Comma, } impl From<NumOp> for BinOp { fn from(op: NumOp) -> Self { Self::Num(op) } } impl From<BitOp> for BinOp { fn from(op: BitOp) -> Self { Self::Bit(op) } } impl From<CompOp> for BinOp { fn from(op: CompOp) -> Self { Self::Comp(op) } } impl From<LogOp> for BinOp { fn from(op: LogOp) -> Self { Self::Log(op) } } impl From<AssignOp> for BinOp { fn from(op: AssignOp) -> Self { Self::Assign(op) } } impl Display for BinOp { fn fmt(&self, f: &mut Formatter<'_>) -> Result { write!( f, "{}", match *self { Self::Num(ref op) => op.to_string(), Self::Bit(ref op) => op.to_string(), Self::Comp(ref op) => op.to_string(), Self::Log(ref op) => op.to_string(), Self::Assign(ref op) => op.to_string(), Self::Comma => ",".to_string(), } ) } } unsafe impl Trace for BinOp { empty_trace!(); } /// An assignment operator assigns a value to its left operand based on the value of its right operand. /// /// The simple assignment operator is equal (`=`), which assigns the value of its right operand to its /// left operand. That is, `x = y` assigns the value of `y to x`. /// /// There are also compound assignment operators that are shorthand for the operations /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-AssignmentOperator /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators#Assignment #[cfg_attr(feature = "deser", derive(Serialize, Deserialize))] #[derive(Clone, Copy, Debug, Finalize, PartialEq)] pub enum AssignOp { /// The addition assignment operator adds the value of the right operand to a variable and assigns the result to the variable. /// /// Syntax: `x += y` /// /// The types of the two operands determine the behavior of the addition assignment operator. Addition or concatenation is possible. /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-AssignmentOperator /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Assignment_Operators#Addition_assignment Add, /// The subtraction assignment operator subtracts the value of the right operand from a variable and assigns the result to the variable. /// /// Syntax: `x -= y` /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-AssignmentOperator /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Assignment_Operators#Subtraction_assignment Sub, /// The multiplication assignment operator multiplies a variable by the value of the right operand and assigns the result to the variable. /// /// Syntax: `x *= y` /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-AssignmentOperator /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Assignment_Operators#Multiplication_assignment Mul, /// The division assignment operator divides a variable by the value of the right operand and assigns the result to the variable. /// /// Syntax: `x /= y` /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-AssignmentOperator /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Assignment_Operators#Division_assignment Div, /// The remainder assignment operator divides a variable by the value of the right operand and assigns the remainder to the variable. /// /// Syntax: `x %= y` /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-AssignmentOperator /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Assignment_Operators#Remainder_assignment Mod, /// The exponentiation assignment operator raises the value of a variable to the power of the right operand. /// /// Syntax: `x ** y` /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-AssignmentOperator /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Assignment_Operators#Exponentiation_assignment Exp, /// The bitwise AND assignment operator uses the binary representation of both operands, does a bitwise AND operation on /// them and assigns the result to the variable. /// /// Syntax: `x &= y` /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-AssignmentOperator /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Assignment_Operators#Bitwise_AND_assignment And, /// The bitwise OR assignment operator uses the binary representation of both operands, does a bitwise OR operation on /// them and assigns the result to the variable. /// /// Syntax: `x |= y` /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-AssignmentOperator /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Assignment_Operators#Bitwise_OR_assignment Or, /// The bitwise XOR assignment operator uses the binary representation of both operands, does a bitwise XOR operation on /// them and assigns the result to the variable. /// /// Syntax: `x ^= y` /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-AssignmentOperator /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Assignment_Operators#Bitwise_XOR_assignment Xor, /// The left shift assignment operator moves the specified amount of bits to the left and assigns the result to the variable. /// /// Syntax: `x <<= y` /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-AssignmentOperator /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Assignment_Operators#Left_shift_assignment Shl, /// The right shift assignment operator moves the specified amount of bits to the right and assigns the result to the variable. /// /// Syntax: `x >>= y` /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-AssignmentOperator /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Assignment_Operators#Right_shift_assignment Shr, /// The unsigned right shift assignment operator moves the specified amount of bits to the right and assigns the result to the variable. /// /// Syntax: `x >>>= y` /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-AssignmentOperator /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Unsigned_right_shift_assignment Ushr, /// The logical and assignment operator only assigns if the target variable is truthy. /// /// Syntax: `x &&= y` /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-AssignmentExpression /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Logical_AND_assignment BoolAnd, /// The logical or assignment operator only assigns if the target variable is falsy. /// /// Syntax: `x ||= y` /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-AssignmentExpression /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Logical_OR_assignment BoolOr, /// The logical nullish assignment operator only assigns if the target variable is nullish (null or undefined). /// /// Syntax: `x ??= y` /// /// More information: /// - [ECMAScript reference][spec] /// - [MDN documentation][mdn] /// /// [spec]: https://tc39.es/ecma262/#prod-AssignmentExpression /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Logical_nullish_assignment Coalesce, } unsafe impl Trace for AssignOp { empty_trace!(); } impl Display for AssignOp { fn fmt(&self, f: &mut Formatter<'_>) -> Result { write!( f, "{}", match *self { Self::Add => "+=", Self::Sub => "-=", Self::Mul => "*=", Self::Exp => "**=", Self::Div => "/=", Self::Mod => "%=", Self::And => "&=", Self::Or => "|=", Self::Xor => "^=", Self::Shl => "<<=", Self::Shr => ">>=", Self::Ushr => ">>>=", Self::BoolAnd => "&&=", Self::BoolOr => "||=", Self::Coalesce => "??=", } ) } }