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refactor(minifier): add a folder struct for constant folding (#4057)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| /// Tri state | ||
| #[derive(Debug, Clone, Copy, PartialEq, Eq)] | ||
| pub enum Tri { | ||
| True, | ||
| False, | ||
| Unknown, | ||
| } | ||
|
|
||
| impl Tri { | ||
| pub fn not(self) -> Self { | ||
| match self { | ||
| Self::True => Self::False, | ||
| Self::False => Self::True, | ||
| Self::Unknown => Self::Unknown, | ||
| } | ||
| } | ||
|
|
||
| pub fn xor(self, other: Self) -> Self { | ||
| self.for_int(-self.value() * other.value()) | ||
| } | ||
|
|
||
| pub fn for_int(self, int: i8) -> Self { | ||
| match int { | ||
| -1 => Self::False, | ||
| 1 => Self::True, | ||
| _ => Self::Unknown, | ||
| } | ||
| } | ||
|
|
||
| pub fn for_boolean(boolean: bool) -> Self { | ||
| if boolean { | ||
| Self::True | ||
| } else { | ||
| Self::False | ||
| } | ||
| } | ||
|
|
||
| pub fn value(self) -> i8 { | ||
| match self { | ||
| Self::True => 1, | ||
| Self::False => -1, | ||
| Self::Unknown => 0, | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,74 @@ | ||
| use oxc_ast::ast::*; | ||
| use oxc_syntax::operator::{BinaryOperator, UnaryOperator}; | ||
|
|
||
| /// JavaScript Language Type | ||
| /// | ||
| /// <https://tc39.es/ecma262/#sec-ecmascript-language-types> | ||
| #[derive(Debug, Clone, Copy, PartialEq, Eq)] | ||
| pub enum Ty { | ||
| BigInt, | ||
| Boolean, | ||
| Null, | ||
| Number, | ||
| Object, | ||
| Str, | ||
| Void, | ||
| Undetermined, | ||
| } | ||
|
|
||
| impl<'a> From<&Expression<'a>> for Ty { | ||
| fn from(expr: &Expression<'a>) -> Self { | ||
| // TODO: complete this | ||
| match expr { | ||
| Expression::BigIntLiteral(_) => Self::BigInt, | ||
| Expression::BooleanLiteral(_) => Self::Boolean, | ||
| Expression::NullLiteral(_) => Self::Null, | ||
| Expression::NumericLiteral(_) => Self::Number, | ||
| Expression::StringLiteral(_) => Self::Str, | ||
| Expression::ObjectExpression(_) | ||
| | Expression::ArrayExpression(_) | ||
| | Expression::RegExpLiteral(_) | ||
| | Expression::FunctionExpression(_) => Self::Object, | ||
| Expression::Identifier(ident) => match ident.name.as_str() { | ||
| "undefined" => Self::Void, | ||
| "NaN" | "Infinity" => Self::Number, | ||
| _ => Self::Undetermined, | ||
| }, | ||
| Expression::UnaryExpression(unary_expr) => match unary_expr.operator { | ||
| UnaryOperator::Void => Self::Void, | ||
| UnaryOperator::UnaryNegation => { | ||
| let argument_ty = Self::from(&unary_expr.argument); | ||
| if argument_ty == Self::BigInt { | ||
| return Self::BigInt; | ||
| } | ||
| Self::Number | ||
| } | ||
| UnaryOperator::UnaryPlus => Self::Number, | ||
| UnaryOperator::LogicalNot => Self::Boolean, | ||
| UnaryOperator::Typeof => Self::Str, | ||
| _ => Self::Undetermined, | ||
| }, | ||
| Expression::BinaryExpression(binary_expr) => match binary_expr.operator { | ||
| BinaryOperator::Addition => { | ||
| let left_ty = Self::from(&binary_expr.left); | ||
| let right_ty = Self::from(&binary_expr.right); | ||
|
|
||
| if left_ty == Self::Str || right_ty == Self::Str { | ||
| return Self::Str; | ||
| } | ||
|
|
||
| // There are some pretty weird cases for object types: | ||
| // {} + [] === "0" | ||
| // [] + {} === "[object Object]" | ||
| if left_ty == Self::Object || right_ty == Self::Object { | ||
| return Self::Undetermined; | ||
| } | ||
|
|
||
| Self::Undetermined | ||
| } | ||
| _ => Self::Undetermined, | ||
| }, | ||
| _ => Self::Undetermined, | ||
| } | ||
| } | ||
| } |
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