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js_ast.go
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js_ast.go
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package js_ast
import (
"sort"
"strconv"
"github.com/evanw/esbuild/internal/ast"
"github.com/evanw/esbuild/internal/compat"
"github.com/evanw/esbuild/internal/logger"
)
// Every module (i.e. file) is parsed into a separate AST data structure. For
// efficiency, the parser also resolves all scopes and binds all symbols in the
// tree.
//
// Identifiers in the tree are referenced by a Ref, which is a pointer into the
// symbol table for the file. The symbol table is stored as a top-level field
// in the AST so it can be accessed without traversing the tree. For example,
// a renaming pass can iterate over the symbol table without touching the tree.
//
// Parse trees are intended to be immutable. That makes it easy to build an
// incremental compiler with a "watch" mode that can avoid re-parsing files
// that have already been parsed. Any passes that operate on an AST after it
// has been parsed should create a copy of the mutated parts of the tree
// instead of mutating the original tree.
type L uint8
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Operator_Precedence
const (
LLowest L = iota
LComma
LSpread
LYield
LAssign
LConditional
LNullishCoalescing
LLogicalOr
LLogicalAnd
LBitwiseOr
LBitwiseXor
LBitwiseAnd
LEquals
LCompare
LShift
LAdd
LMultiply
LExponentiation
LPrefix
LPostfix
LNew
LCall
LMember
)
type OpCode uint8
func (op OpCode) IsPrefix() bool {
return op < UnOpPostDec
}
func (op OpCode) UnaryAssignTarget() AssignTarget {
if op >= UnOpPreDec && op <= UnOpPostInc {
return AssignTargetUpdate
}
return AssignTargetNone
}
func (op OpCode) IsLeftAssociative() bool {
return op >= BinOpAdd && op < BinOpComma && op != BinOpPow
}
func (op OpCode) IsRightAssociative() bool {
return op >= BinOpAssign || op == BinOpPow
}
func (op OpCode) BinaryAssignTarget() AssignTarget {
if op == BinOpAssign {
return AssignTargetReplace
}
if op > BinOpAssign {
return AssignTargetUpdate
}
return AssignTargetNone
}
func (op OpCode) IsShortCircuit() bool {
switch op {
case BinOpLogicalOr, BinOpLogicalOrAssign,
BinOpLogicalAnd, BinOpLogicalAndAssign,
BinOpNullishCoalescing, BinOpNullishCoalescingAssign:
return true
}
return false
}
type AssignTarget uint8
const (
AssignTargetNone AssignTarget = iota
AssignTargetReplace // "a = b"
AssignTargetUpdate // "a += b"
)
// If you add a new token, remember to add it to "OpTable" too
const (
// Prefix
UnOpPos OpCode = iota
UnOpNeg
UnOpCpl
UnOpNot
UnOpVoid
UnOpTypeof
UnOpDelete
// Prefix update
UnOpPreDec
UnOpPreInc
// Postfix update
UnOpPostDec
UnOpPostInc
// Left-associative
BinOpAdd
BinOpSub
BinOpMul
BinOpDiv
BinOpRem
BinOpPow
BinOpLt
BinOpLe
BinOpGt
BinOpGe
BinOpIn
BinOpInstanceof
BinOpShl
BinOpShr
BinOpUShr
BinOpLooseEq
BinOpLooseNe
BinOpStrictEq
BinOpStrictNe
BinOpNullishCoalescing
BinOpLogicalOr
BinOpLogicalAnd
BinOpBitwiseOr
BinOpBitwiseAnd
BinOpBitwiseXor
// Non-associative
BinOpComma
// Right-associative
BinOpAssign
BinOpAddAssign
BinOpSubAssign
BinOpMulAssign
BinOpDivAssign
BinOpRemAssign
BinOpPowAssign
BinOpShlAssign
BinOpShrAssign
BinOpUShrAssign
BinOpBitwiseOrAssign
BinOpBitwiseAndAssign
BinOpBitwiseXorAssign
BinOpNullishCoalescingAssign
BinOpLogicalOrAssign
BinOpLogicalAndAssign
)
type opTableEntry struct {
Text string
Level L
IsKeyword bool
}
var OpTable = []opTableEntry{
// Prefix
{"+", LPrefix, false},
{"-", LPrefix, false},
{"~", LPrefix, false},
{"!", LPrefix, false},
{"void", LPrefix, true},
{"typeof", LPrefix, true},
{"delete", LPrefix, true},
// Prefix update
{"--", LPrefix, false},
{"++", LPrefix, false},
// Postfix update
{"--", LPostfix, false},
{"++", LPostfix, false},
// Left-associative
{"+", LAdd, false},
{"-", LAdd, false},
{"*", LMultiply, false},
{"/", LMultiply, false},
{"%", LMultiply, false},
{"**", LExponentiation, false}, // Right-associative
{"<", LCompare, false},
{"<=", LCompare, false},
{">", LCompare, false},
{">=", LCompare, false},
{"in", LCompare, true},
{"instanceof", LCompare, true},
{"<<", LShift, false},
{">>", LShift, false},
{">>>", LShift, false},
{"==", LEquals, false},
{"!=", LEquals, false},
{"===", LEquals, false},
{"!==", LEquals, false},
{"??", LNullishCoalescing, false},
{"||", LLogicalOr, false},
{"&&", LLogicalAnd, false},
{"|", LBitwiseOr, false},
{"&", LBitwiseAnd, false},
{"^", LBitwiseXor, false},
// Non-associative
{",", LComma, false},
// Right-associative
{"=", LAssign, false},
{"+=", LAssign, false},
{"-=", LAssign, false},
{"*=", LAssign, false},
{"/=", LAssign, false},
{"%=", LAssign, false},
{"**=", LAssign, false},
{"<<=", LAssign, false},
{">>=", LAssign, false},
{">>>=", LAssign, false},
{"|=", LAssign, false},
{"&=", LAssign, false},
{"^=", LAssign, false},
{"??=", LAssign, false},
{"||=", LAssign, false},
{"&&=", LAssign, false},
}
type LocRef struct {
Loc logger.Loc
Ref Ref
}
type Comment struct {
Text string
Loc logger.Loc
}
type PropertyKind uint8
const (
PropertyNormal PropertyKind = iota
PropertyGet
PropertySet
PropertySpread
PropertyDeclare
PropertyClassStaticBlock
)
type ClassStaticBlock struct {
Block SBlock
Loc logger.Loc
}
type Property struct {
ClassStaticBlock *ClassStaticBlock
Key Expr
// This is omitted for class fields
ValueOrNil Expr
// This is used when parsing a pattern that uses default values:
//
// [a = 1] = [];
// ({a = 1} = {});
//
// It's also used for class fields:
//
// class Foo { a = 1 }
//
InitializerOrNil Expr
TSDecorators []Expr
Kind PropertyKind
IsComputed bool
IsMethod bool
IsStatic bool
WasShorthand bool
PreferQuotedKey bool
}
type PropertyBinding struct {
Key Expr
Value Binding
DefaultValueOrNil Expr
IsComputed bool
IsSpread bool
PreferQuotedKey bool
}
type Arg struct {
Binding Binding
DefaultOrNil Expr
TSDecorators []Expr
// "constructor(public x: boolean) {}"
IsTypeScriptCtorField bool
}
type Fn struct {
Name *LocRef
Args []Arg
Body FnBody
ArgumentsRef Ref
OpenParenLoc logger.Loc
IsAsync bool
IsGenerator bool
HasRestArg bool
HasIfScope bool
// This is true if the function is a method
IsUniqueFormalParameters bool
}
type FnBody struct {
Block SBlock
Loc logger.Loc
}
type Class struct {
TSDecorators []Expr
Name *LocRef
ExtendsOrNil Expr
Properties []Property
ClassKeyword logger.Range
BodyLoc logger.Loc
CloseBraceLoc logger.Loc
}
type ArrayBinding struct {
Binding Binding
DefaultValueOrNil Expr
}
type Binding struct {
Data B
Loc logger.Loc
}
// This interface is never called. Its purpose is to encode a variant type in
// Go's type system.
type B interface{ isBinding() }
func (*BMissing) isBinding() {}
func (*BIdentifier) isBinding() {}
func (*BArray) isBinding() {}
func (*BObject) isBinding() {}
type BMissing struct{}
type BIdentifier struct{ Ref Ref }
type BArray struct {
Items []ArrayBinding
HasSpread bool
IsSingleLine bool
}
type BObject struct {
Properties []PropertyBinding
IsSingleLine bool
}
type Expr struct {
Data E
Loc logger.Loc
}
// This interface is never called. Its purpose is to encode a variant type in
// Go's type system.
type E interface{ isExpr() }
func (*EArray) isExpr() {}
func (*EUnary) isExpr() {}
func (*EBinary) isExpr() {}
func (*EBoolean) isExpr() {}
func (*ESuper) isExpr() {}
func (*ENull) isExpr() {}
func (*EUndefined) isExpr() {}
func (*EThis) isExpr() {}
func (*ENew) isExpr() {}
func (*ENewTarget) isExpr() {}
func (*EImportMeta) isExpr() {}
func (*ECall) isExpr() {}
func (*EDot) isExpr() {}
func (*EIndex) isExpr() {}
func (*EArrow) isExpr() {}
func (*EFunction) isExpr() {}
func (*EClass) isExpr() {}
func (*EIdentifier) isExpr() {}
func (*EImportIdentifier) isExpr() {}
func (*EPrivateIdentifier) isExpr() {}
func (*EMangledProp) isExpr() {}
func (*EJSXElement) isExpr() {}
func (*EMissing) isExpr() {}
func (*ENumber) isExpr() {}
func (*EBigInt) isExpr() {}
func (*EObject) isExpr() {}
func (*ESpread) isExpr() {}
func (*EString) isExpr() {}
func (*ETemplate) isExpr() {}
func (*ERegExp) isExpr() {}
func (*EInlinedEnum) isExpr() {}
func (*EAwait) isExpr() {}
func (*EYield) isExpr() {}
func (*EIf) isExpr() {}
func (*ERequireString) isExpr() {}
func (*ERequireResolveString) isExpr() {}
func (*EImportString) isExpr() {}
func (*EImportCall) isExpr() {}
type EArray struct {
Items []Expr
CommaAfterSpread logger.Loc
CloseBracketLoc logger.Loc
IsSingleLine bool
IsParenthesized bool
}
type EUnary struct {
Value Expr
Op OpCode
}
type EBinary struct {
Left Expr
Right Expr
Op OpCode
}
type EBoolean struct{ Value bool }
type EMissing struct{}
type ESuper struct{}
type ENull struct{}
type EUndefined struct{}
type EThis struct{}
type ENewTarget struct {
Range logger.Range
}
type EImportMeta struct {
RangeLen int32
}
// These help reduce unnecessary memory allocations
var BMissingShared = &BMissing{}
var EMissingShared = &EMissing{}
var ESuperShared = &ESuper{}
var ENullShared = &ENull{}
var EUndefinedShared = &EUndefined{}
var EThisShared = &EThis{}
type ENew struct {
Target Expr
Args []Expr
CloseParenLoc logger.Loc
// True if there is a comment containing "@__PURE__" or "#__PURE__" preceding
// this call expression. See the comment inside ECall for more details.
CanBeUnwrappedIfUnused bool
}
type OptionalChain uint8
const (
// "a.b"
OptionalChainNone OptionalChain = iota
// "a?.b"
OptionalChainStart
// "a?.b.c" => ".c" is OptionalChainContinue
// "(a?.b).c" => ".c" is OptionalChainNone
OptionalChainContinue
)
type ECall struct {
Target Expr
Args []Expr
CloseParenLoc logger.Loc
OptionalChain OptionalChain
IsDirectEval bool
// True if there is a comment containing "@__PURE__" or "#__PURE__" preceding
// this call expression. This is an annotation used for tree shaking, and
// means that the call can be removed if it's unused. It does not mean the
// call is pure (e.g. it may still return something different if called twice).
//
// Note that the arguments are not considered to be part of the call. If the
// call itself is removed due to this annotation, the arguments must remain
// if they have side effects.
CanBeUnwrappedIfUnused bool
IsKeepName bool
}
func (a *ECall) HasSameFlagsAs(b *ECall) bool {
return a.OptionalChain == b.OptionalChain &&
a.IsDirectEval == b.IsDirectEval &&
a.CanBeUnwrappedIfUnused == b.CanBeUnwrappedIfUnused
}
type EDot struct {
Target Expr
Name string
NameLoc logger.Loc
OptionalChain OptionalChain
// If true, this property access is known to be free of side-effects. That
// means it can be removed if the resulting value isn't used.
CanBeRemovedIfUnused bool
// If true, this property access is a function that, when called, can be
// unwrapped if the resulting value is unused. Unwrapping means discarding
// the call target but keeping any arguments with side effects.
CallCanBeUnwrappedIfUnused bool
}
func (a *EDot) HasSameFlagsAs(b *EDot) bool {
return a.OptionalChain == b.OptionalChain &&
a.CanBeRemovedIfUnused == b.CanBeRemovedIfUnused &&
a.CallCanBeUnwrappedIfUnused == b.CallCanBeUnwrappedIfUnused
}
type EIndex struct {
Target Expr
Index Expr
OptionalChain OptionalChain
// If true, this property access is known to be free of side-effects. That
// means it can be removed if the resulting value isn't used.
CanBeRemovedIfUnused bool
// If true, this property access is a function that, when called, can be
// unwrapped if the resulting value is unused. Unwrapping means discarding
// the call target but keeping any arguments with side effects.
CallCanBeUnwrappedIfUnused bool
}
func (a *EIndex) HasSameFlagsAs(b *EIndex) bool {
return a.OptionalChain == b.OptionalChain &&
a.CanBeRemovedIfUnused == b.CanBeRemovedIfUnused &&
a.CallCanBeUnwrappedIfUnused == b.CallCanBeUnwrappedIfUnused
}
type EArrow struct {
Args []Arg
Body FnBody
IsAsync bool
HasRestArg bool
PreferExpr bool // Use shorthand if true and "Body" is a single return statement
}
type EFunction struct{ Fn Fn }
type EClass struct{ Class Class }
type EIdentifier struct {
Ref Ref
// If we're inside a "with" statement, this identifier may be a property
// access. In that case it would be incorrect to remove this identifier since
// the property access may be a getter or setter with side effects.
MustKeepDueToWithStmt bool
// If true, this identifier is known to not have a side effect (i.e. to not
// throw an exception) when referenced. If false, this identifier may or may
// not have side effects when referenced. This is used to allow the removal
// of known globals such as "Object" if they aren't used.
CanBeRemovedIfUnused bool
// If true, this identifier represents a function that, when called, can be
// unwrapped if the resulting value is unused. Unwrapping means discarding
// the call target but keeping any arguments with side effects.
CallCanBeUnwrappedIfUnused bool
}
// This is similar to an EIdentifier but it represents a reference to an ES6
// import item.
//
// Depending on how the code is linked, the file containing this EImportIdentifier
// may or may not be in the same module group as the file it was imported from.
//
// If it's the same module group than we can just merge the import item symbol
// with the corresponding symbol that was imported, effectively renaming them
// to be the same thing and statically binding them together.
//
// But if it's a different module group, then the import must be dynamically
// evaluated using a property access off the corresponding namespace symbol,
// which represents the result of a require() call.
//
// It's stored as a separate type so it's not easy to confuse with a plain
// identifier. For example, it'd be bad if code trying to convert "{x: x}" into
// "{x}" shorthand syntax wasn't aware that the "x" in this case is actually
// "{x: importedNamespace.x}". This separate type forces code to opt-in to
// doing this instead of opt-out.
type EImportIdentifier struct {
Ref Ref
PreferQuotedKey bool
// If true, this was originally an identifier expression such as "foo". If
// false, this could potentially have been a member access expression such
// as "ns.foo" off of an imported namespace object.
WasOriginallyIdentifier bool
}
// This is similar to EIdentifier but it represents class-private fields and
// methods. It can be used where computed properties can be used, such as
// EIndex and Property.
type EPrivateIdentifier struct {
Ref Ref
}
// This represents an internal property name that can be mangled. The symbol
// referenced by this expression should be a "SymbolMangledProp" symbol.
type EMangledProp struct {
Ref Ref
}
type EJSXElement struct {
TagOrNil Expr
Properties []Property
Children []Expr
CloseLoc logger.Loc
}
type ENumber struct{ Value float64 }
type EBigInt struct{ Value string }
type EObject struct {
Properties []Property
CommaAfterSpread logger.Loc
CloseBraceLoc logger.Loc
IsSingleLine bool
IsParenthesized bool
}
type ESpread struct{ Value Expr }
// This is used for both strings and no-substitution template literals to reduce
// the number of cases that need to be checked for string optimization code
type EString struct {
Value []uint16
LegacyOctalLoc logger.Loc
PreferTemplate bool
}
type TemplatePart struct {
Value Expr
TailRaw string // Only use when "TagOrNil" is not nil
TailCooked []uint16 // Only use when "TagOrNil" is nil
TailLoc logger.Loc
}
type ETemplate struct {
TagOrNil Expr
HeadRaw string // Only use when "TagOrNil" is not nil
HeadCooked []uint16 // Only use when "TagOrNil" is nil
Parts []TemplatePart
HeadLoc logger.Loc
LegacyOctalLoc logger.Loc
}
type ERegExp struct{ Value string }
type EInlinedEnum struct {
Value Expr
Comment string
}
type EAwait struct {
Value Expr
}
type EYield struct {
ValueOrNil Expr
IsStar bool
}
type EIf struct {
Test Expr
Yes Expr
No Expr
}
type ERequireString struct {
ImportRecordIndex uint32
}
type ERequireResolveString struct {
ImportRecordIndex uint32
}
type EImportString struct {
// Comments inside "import()" expressions have special meaning for Webpack.
// Preserving comments inside these expressions makes it possible to use
// esbuild as a TypeScript-to-JavaScript frontend for Webpack to improve
// performance. We intentionally do not interpret these comments in esbuild
// because esbuild is not Webpack. But we do preserve them since doing so is
// harmless, easy to maintain, and useful to people. See the Webpack docs for
// more info: https://webpack.js.org/api/module-methods/#magic-comments.
LeadingInteriorComments []Comment
ImportRecordIndex uint32
}
type EImportCall struct {
Expr Expr
OptionsOrNil Expr
// See the comment for this same field on "EImportString" for more information
LeadingInteriorComments []Comment
}
type Stmt struct {
Data S
Loc logger.Loc
}
// This interface is never called. Its purpose is to encode a variant type in
// Go's type system.
type S interface{ isStmt() }
func (*SBlock) isStmt() {}
func (*SComment) isStmt() {}
func (*SDebugger) isStmt() {}
func (*SDirective) isStmt() {}
func (*SEmpty) isStmt() {}
func (*STypeScript) isStmt() {}
func (*SExportClause) isStmt() {}
func (*SExportFrom) isStmt() {}
func (*SExportDefault) isStmt() {}
func (*SExportStar) isStmt() {}
func (*SExportEquals) isStmt() {}
func (*SLazyExport) isStmt() {}
func (*SExpr) isStmt() {}
func (*SEnum) isStmt() {}
func (*SNamespace) isStmt() {}
func (*SFunction) isStmt() {}
func (*SClass) isStmt() {}
func (*SLabel) isStmt() {}
func (*SIf) isStmt() {}
func (*SFor) isStmt() {}
func (*SForIn) isStmt() {}
func (*SForOf) isStmt() {}
func (*SDoWhile) isStmt() {}
func (*SWhile) isStmt() {}
func (*SWith) isStmt() {}
func (*STry) isStmt() {}
func (*SSwitch) isStmt() {}
func (*SImport) isStmt() {}
func (*SReturn) isStmt() {}
func (*SThrow) isStmt() {}
func (*SLocal) isStmt() {}
func (*SBreak) isStmt() {}
func (*SContinue) isStmt() {}
type SBlock struct {
Stmts []Stmt
CloseBraceLoc logger.Loc
}
type SEmpty struct{}
// This is a stand-in for a TypeScript type declaration
type STypeScript struct{}
type SComment struct {
Text string
IsLegalComment bool
}
type SDebugger struct{}
type SDirective struct {
Value []uint16
LegacyOctalLoc logger.Loc
}
type SExportClause struct {
Items []ClauseItem
IsSingleLine bool
}
type SExportFrom struct {
Items []ClauseItem
NamespaceRef Ref
ImportRecordIndex uint32
IsSingleLine bool
}
type SExportDefault struct {
Value Stmt // May be a SExpr or SFunction or SClass
DefaultName LocRef
}
type ExportStarAlias struct {
// Although this alias name starts off as being the same as the statement's
// namespace symbol, it may diverge if the namespace symbol name is minified.
// The original alias name is preserved here to avoid this scenario.
OriginalName string
Loc logger.Loc
}
type SExportStar struct {
Alias *ExportStarAlias
NamespaceRef Ref
ImportRecordIndex uint32
}
// This is an "export = value;" statement in TypeScript
type SExportEquals struct {
Value Expr
}
// The decision of whether to export an expression using "module.exports" or
// "export default" is deferred until linking using this statement kind
type SLazyExport struct {
Value Expr
}
type SExpr struct {
Value Expr
}
type EnumValue struct {
ValueOrNil Expr
Name []uint16
Ref Ref
Loc logger.Loc
}
type SEnum struct {
Values []EnumValue
Name LocRef
Arg Ref
IsExport bool
}
type SNamespace struct {
Stmts []Stmt
Name LocRef
Arg Ref
IsExport bool
}
type SFunction struct {
Fn Fn
IsExport bool
}
type SClass struct {
Class Class
IsExport bool
}
type SLabel struct {
Stmt Stmt
Name LocRef
}
type SIf struct {
Test Expr
Yes Stmt
NoOrNil Stmt
}
type SFor struct {
InitOrNil Stmt // May be a SConst, SLet, SVar, or SExpr
TestOrNil Expr
UpdateOrNil Expr
Body Stmt
}
type SForIn struct {
Init Stmt // May be a SConst, SLet, SVar, or SExpr
Value Expr
Body Stmt
}
type SForOf struct {
Init Stmt // May be a SConst, SLet, SVar, or SExpr
Value Expr
Body Stmt
IsAwait bool
}
type SDoWhile struct {
Body Stmt
Test Expr
}
type SWhile struct {
Test Expr
Body Stmt
}
type SWith struct {
Value Expr
Body Stmt
BodyLoc logger.Loc
}
type Catch struct {
BindingOrNil Binding
Block SBlock
Loc logger.Loc
BlockLoc logger.Loc
}
type Finally struct {
Block SBlock
Loc logger.Loc
}
type STry struct {
Catch *Catch
Finally *Finally
Block SBlock
BlockLoc logger.Loc
}
type Case struct {
ValueOrNil Expr // If this is nil, this is "default" instead of "case"
Body []Stmt
}
type SSwitch struct {
Test Expr
Cases []Case
BodyLoc logger.Loc
}
// This object represents all of these types of import statements:
//
// import 'path'
// import {item1, item2} from 'path'
// import * as ns from 'path'
// import defaultItem, {item1, item2} from 'path'
// import defaultItem, * as ns from 'path'
//
// Many parts are optional and can be combined in different ways. The only
// restriction is that you cannot have both a clause and a star namespace.
type SImport struct {
DefaultName *LocRef
Items *[]ClauseItem
StarNameLoc *logger.Loc
// If this is a star import: This is a Ref for the namespace symbol. The Loc
// for the symbol is StarLoc.
//
// Otherwise: This is an auto-generated Ref for the namespace representing
// the imported file. In this case StarLoc is nil. The NamespaceRef is used
// when converting this module to a CommonJS module.
NamespaceRef Ref
ImportRecordIndex uint32
IsSingleLine bool
}
type SReturn struct {
ValueOrNil Expr
}
type SThrow struct {
Value Expr
}
type LocalKind uint8
const (