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parser.go
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1455 lines (1229 loc) · 29.3 KB
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package parser
import (
"fmt"
"os"
)
// Parse parses AIDL source code and returns the AST document.
func Parse(
filename string,
src []byte,
) (*Document, error) {
p := &parserState{
lex: NewLexer(filename, src),
}
p.advance()
return p.parseDocument()
}
// ParseFile reads a file and parses it as AIDL.
func ParseFile(
filename string,
) (*Document, error) {
src, err := os.ReadFile(filename)
if err != nil {
return nil, fmt.Errorf("reading %s: %w", filename, err)
}
return Parse(filename, src)
}
// parserState holds the state of the recursive-descent parser.
type parserState struct {
lex *Lexer
cur Token
lexErr error
pushback *Token // synthetic token to return before the next lex call
}
func (p *parserState) advance() Token {
prev := p.cur
if p.pushback != nil {
p.cur = *p.pushback
p.pushback = nil
} else {
p.cur = p.lex.Next()
}
if p.cur.Kind == TokenError {
p.lexErr = fmt.Errorf("%s: %s", p.cur.Pos, p.cur.Value)
}
return prev
}
func (p *parserState) at(
kind TokenKind,
) bool {
return p.cur.Kind == kind
}
func (p *parserState) expect(
kind TokenKind,
) (Token, error) {
if p.lexErr != nil {
return Token{}, p.lexErr
}
if p.cur.Kind != kind {
return Token{}, fmt.Errorf(
"%s: expected %s, got %s (%q)",
p.cur.Pos, kind, p.cur.Kind, p.cur.Value,
)
}
return p.advance(), nil
}
// expectRAngle consumes a '>' token. When the current token is '>>' (RShift),
// it splits it into two '>' tokens, consuming one and pushing back the other.
// This handles nested generics like Map<String, List<Foo>>.
func (p *parserState) expectRAngle() error {
if p.lexErr != nil {
return p.lexErr
}
if p.cur.Kind == TokenRAngle {
p.advance()
return nil
}
if p.cur.Kind == TokenRShift {
// Split ">>" into ">" consumed now, and ">" pushed back.
synth := Token{
Kind: TokenRAngle,
Pos: p.cur.Pos,
Value: ">",
}
synth.Pos.Column++
p.pushback = &synth
p.advance()
return nil
}
return fmt.Errorf(
"%s: expected >, got %s (%q)",
p.cur.Pos, p.cur.Kind, p.cur.Value,
)
}
func (p *parserState) parseDocument() (*Document, error) {
if p.lexErr != nil {
return nil, p.lexErr
}
doc := &Document{}
// Optional package declaration.
if p.at(TokenPackage) {
pkg, err := p.parsePackage()
if err != nil {
return nil, err
}
doc.Package = pkg
}
// Import declarations.
for p.at(TokenImport) {
imp, err := p.parseImport()
if err != nil {
return nil, err
}
doc.Imports = append(doc.Imports, imp)
}
// Top-level definitions.
for !p.at(TokenEOF) {
if p.lexErr != nil {
return nil, p.lexErr
}
def, err := p.parseDefinition()
if err != nil {
return nil, err
}
doc.Definitions = append(doc.Definitions, def)
}
return doc, nil
}
func (p *parserState) parsePackage() (*PackageDecl, error) {
tok, err := p.expect(TokenPackage)
if err != nil {
return nil, err
}
name, err := p.parseDottedName()
if err != nil {
return nil, err
}
if _, err := p.expect(TokenSemicolon); err != nil {
return nil, err
}
return &PackageDecl{Pos: tok.Pos, Name: name}, nil
}
func (p *parserState) parseImport() (*ImportDecl, error) {
tok, err := p.expect(TokenImport)
if err != nil {
return nil, err
}
name, err := p.parseDottedName()
if err != nil {
return nil, err
}
if _, err := p.expect(TokenSemicolon); err != nil {
return nil, err
}
return &ImportDecl{Pos: tok.Pos, Name: name}, nil
}
func (p *parserState) parseDottedName() (string, error) {
tok, err := p.expect(TokenIdent)
if err != nil {
return "", err
}
name := tok.Value
for p.at(TokenDot) {
p.advance()
part, err := p.expect(TokenIdent)
if err != nil {
return "", err
}
name += "." + part.Value
}
return name, nil
}
func (p *parserState) parseDefinition() (Definition, error) {
annots, err := p.parseAnnotations()
if err != nil {
return nil, err
}
switch p.cur.Kind {
case TokenOneway:
return p.parseInterface(annots, true)
case TokenInterface:
return p.parseInterface(annots, false)
case TokenParcelable:
return p.parseParcelable(annots)
case TokenEnum:
return p.parseEnum(annots)
case TokenUnion:
return p.parseUnion(annots)
default:
return nil, fmt.Errorf(
"%s: expected definition (interface, parcelable, enum, union), got %s (%q)",
p.cur.Pos, p.cur.Kind, p.cur.Value,
)
}
}
func (p *parserState) parseInterface(
annots []*Annotation,
oneway bool,
) (*InterfaceDecl, error) {
if oneway {
p.advance() // consume "oneway"
}
tok, err := p.expect(TokenInterface)
if err != nil {
return nil, err
}
nameTok, err := p.expect(TokenIdent)
if err != nil {
return nil, err
}
if _, err := p.expect(TokenLBrace); err != nil {
return nil, err
}
decl := &InterfaceDecl{
Pos: tok.Pos,
Annots: annots,
IntfName: nameTok.Value,
Oneway: oneway,
}
for !p.at(TokenRBrace) && !p.at(TokenEOF) {
switch {
case p.at(TokenConst):
c, err := p.parseConstant()
if err != nil {
return nil, err
}
decl.Constants = append(decl.Constants, c)
case p.isNestedTypeStart():
nested, err := p.parseInterfaceMemberDefinition()
if err != nil {
return nil, err
}
decl.NestedTypes = append(decl.NestedTypes, nested)
default:
m, err := p.parseMethod()
if err != nil {
return nil, err
}
decl.Methods = append(decl.Methods, m)
}
}
if _, err := p.expect(TokenRBrace); err != nil {
return nil, err
}
return decl, nil
}
// isNestedTypeStart checks whether the current position starts a nested type
// definition. It handles annotations before the type keyword, and the
// "oneway interface" pattern.
func (p *parserState) isNestedTypeStart() bool {
// Direct type keyword without annotations.
if isNestedTypeKeyword(p.cur.Kind) {
return true
}
// "oneway interface" pattern for nested oneway interfaces.
if p.at(TokenOneway) && p.peekNextTokenKind() == TokenInterface {
return true
}
// Annotations followed by a type keyword are also nested type definitions.
// We peek ahead past annotations to see if a type keyword follows.
if !p.at(TokenAnnotation) {
return false
}
return p.peekPastAnnotationsIsTypeKeyword()
}
// peekPastAnnotationsIsTypeKeyword looks ahead in the lexer source (without
// consuming tokens) to check if a sequence of annotations is followed by a
// type keyword (enum, parcelable, union, interface).
//
// Precondition: p.cur.Kind == TokenAnnotation.
func (p *parserState) peekPastAnnotationsIsTypeKeyword() bool {
// Save lexer state to restore later.
savedOffset := p.lex.Offset
savedLine := p.lex.Line
savedColumn := p.lex.Column
defer func() {
p.lex.Offset = savedOffset
p.lex.Line = savedLine
p.lex.Column = savedColumn
}()
// p.cur is already an annotation token. The lexer is positioned just
// after the annotation name. We need to skip any params of the current
// annotation, then check for more annotations or a type keyword.
for {
// Skip annotation params if present (the '(' ... ')' block).
if err := p.lex.skipWhitespaceAndComments(); err != nil {
return false
}
if p.lex.Offset < len(p.lex.Src) && p.lex.Src[p.lex.Offset] == '(' {
depth := 1
p.lex.advance()
for depth > 0 && p.lex.Offset < len(p.lex.Src) {
ch := p.lex.advance()
switch ch {
case '(':
depth++
case ')':
depth--
}
}
}
// Get the next token after the annotation (and its params).
tok := p.lex.Next()
if tok.Kind == TokenAnnotation {
// Another annotation follows; continue the loop to skip its params.
continue
}
// "oneway interface" pattern: oneway followed by interface keyword.
if tok.Kind == TokenOneway {
next := p.lex.Next()
return next.Kind == TokenInterface
}
return isNestedTypeKeyword(tok.Kind)
}
}
func (p *parserState) parseMethod() (*MethodDecl, error) {
annots, err := p.parseAnnotations()
if err != nil {
return nil, err
}
pos := p.cur.Pos
oneway := false
if p.at(TokenOneway) {
oneway = true
p.advance()
}
retType, err := p.parseTypeSpecifier()
if err != nil {
return nil, err
}
nameTok, err := p.expect(TokenIdent)
if err != nil {
return nil, err
}
if _, err := p.expect(TokenLParen); err != nil {
return nil, err
}
var params []*ParamDecl
for !p.at(TokenRParen) && !p.at(TokenEOF) {
if len(params) > 0 {
if _, err := p.expect(TokenComma); err != nil {
return nil, err
}
}
param, err := p.parseParam()
if err != nil {
return nil, err
}
params = append(params, param)
}
if _, err := p.expect(TokenRParen); err != nil {
return nil, err
}
transactionID := 0
if p.at(TokenAssign) {
p.advance()
idTok, err := p.expect(TokenIntLiteral)
if err != nil {
return nil, err
}
val, err := parseIntString(idTok.Value)
if err != nil {
return nil, fmt.Errorf("%s: invalid transaction ID: %w", idTok.Pos, err)
}
transactionID = int(val)
}
if _, err := p.expect(TokenSemicolon); err != nil {
return nil, err
}
return &MethodDecl{
Pos: pos,
Annots: annots,
Oneway: oneway,
ReturnType: retType,
MethodName: nameTok.Value,
Params: params,
TransactionID: transactionID,
}, nil
}
func (p *parserState) parseParam() (*ParamDecl, error) {
annots, err := p.parseAnnotations()
if err != nil {
return nil, err
}
pos := p.cur.Pos
dir := DirectionNone
switch p.cur.Kind {
case TokenIn:
dir = DirectionIn
p.advance()
case TokenOut:
dir = DirectionOut
p.advance()
case TokenInout:
dir = DirectionInOut
p.advance()
}
typ, err := p.parseTypeSpecifier()
if err != nil {
return nil, err
}
nameTok, err := p.expect(TokenIdent)
if err != nil {
return nil, err
}
return &ParamDecl{
Pos: pos,
Annots: annots,
Direction: dir,
Type: typ,
ParamName: nameTok.Value,
}, nil
}
func (p *parserState) parseParcelable(
annots []*Annotation,
) (*ParcelableDecl, error) {
tok, err := p.expect(TokenParcelable)
if err != nil {
return nil, err
}
nameTok, err := p.expect(TokenIdent)
if err != nil {
return nil, err
}
// Support dotted names in forward declarations (e.g., parcelable Foo.Bar;).
name := nameTok.Value
for p.at(TokenDot) {
p.advance()
part, err := p.expect(TokenIdent)
if err != nil {
return nil, err
}
name += "." + part.Value
}
decl := &ParcelableDecl{
Pos: tok.Pos,
Annots: annots,
ParcName: name,
}
// Generic type parameters on declarations (e.g., parcelable Foo<T>).
if p.at(TokenLAngle) {
if err := p.skipTypeParams(); err != nil {
return nil, err
}
}
// Forward-declared parcelable with foreign language headers.
if p.at(TokenIdent) && isForeignHeaderDirective(p.cur.Value) {
if err := p.parseForeignHeaders(decl); err != nil {
return nil, err
}
if _, err := p.expect(TokenSemicolon); err != nil {
return nil, err
}
return decl, nil
}
// Forward-declared parcelable without body (just semicolon).
if p.at(TokenSemicolon) {
p.advance()
return decl, nil
}
if _, err := p.expect(TokenLBrace); err != nil {
return nil, err
}
for !p.at(TokenRBrace) && !p.at(TokenEOF) {
switch {
case p.at(TokenConst):
c, err := p.parseConstant()
if err != nil {
return nil, err
}
decl.Constants = append(decl.Constants, c)
case p.isNestedTypeStart():
nested, err := p.parseInterfaceMemberDefinition()
if err != nil {
return nil, err
}
decl.NestedTypes = append(decl.NestedTypes, nested)
default:
f, err := p.parseField()
if err != nil {
return nil, err
}
decl.Fields = append(decl.Fields, f)
}
}
if _, err := p.expect(TokenRBrace); err != nil {
return nil, err
}
return decl, nil
}
func (p *parserState) parseField() (*FieldDecl, error) {
annots, err := p.parseAnnotations()
if err != nil {
return nil, err
}
pos := p.cur.Pos
typ, err := p.parseTypeSpecifier()
if err != nil {
return nil, err
}
nameTok, err := p.expect(TokenIdent)
if err != nil {
return nil, err
}
var defaultVal ConstExpr
if p.at(TokenAssign) {
p.advance()
defaultVal, err = p.parseConstExpr()
if err != nil {
return nil, err
}
}
if _, err := p.expect(TokenSemicolon); err != nil {
return nil, err
}
return &FieldDecl{
Pos: pos,
Annots: annots,
Type: typ,
FieldName: nameTok.Value,
DefaultValue: defaultVal,
}, nil
}
func (p *parserState) parseEnum(
annots []*Annotation,
) (*EnumDecl, error) {
tok, err := p.expect(TokenEnum)
if err != nil {
return nil, err
}
nameTok, err := p.expect(TokenIdent)
if err != nil {
return nil, err
}
if _, err := p.expect(TokenLBrace); err != nil {
return nil, err
}
decl := &EnumDecl{
Pos: tok.Pos,
Annots: annots,
EnumName: nameTok.Value,
}
// Extract backing type from @Backing annotation.
for _, a := range annots {
if a.Name == "Backing" {
if typeExpr, ok := a.Params["type"]; ok {
if strLit, ok := typeExpr.(*StringLiteralExpr); ok {
decl.BackingType = &TypeSpecifier{
Pos: a.Pos,
Name: strLit.Value,
}
}
}
}
}
for !p.at(TokenRBrace) && !p.at(TokenEOF) {
e, err := p.parseEnumerator()
if err != nil {
return nil, err
}
decl.Enumerators = append(decl.Enumerators, e)
// Trailing comma is optional; consume if present.
if p.at(TokenComma) {
p.advance()
}
}
if _, err := p.expect(TokenRBrace); err != nil {
return nil, err
}
return decl, nil
}
func (p *parserState) parseEnumerator() (*Enumerator, error) {
nameTok, err := p.expect(TokenIdent)
if err != nil {
return nil, err
}
e := &Enumerator{
Pos: nameTok.Pos,
Name: nameTok.Value,
}
if p.at(TokenAssign) {
p.advance()
val, err := p.parseConstExpr()
if err != nil {
return nil, err
}
e.Value = val
}
return e, nil
}
func (p *parserState) parseUnion(
annots []*Annotation,
) (*UnionDecl, error) {
tok, err := p.expect(TokenUnion)
if err != nil {
return nil, err
}
nameTok, err := p.expect(TokenIdent)
if err != nil {
return nil, err
}
if _, err := p.expect(TokenLBrace); err != nil {
return nil, err
}
decl := &UnionDecl{
Pos: tok.Pos,
Annots: annots,
UnionName: nameTok.Value,
}
for !p.at(TokenRBrace) && !p.at(TokenEOF) {
switch {
case p.at(TokenConst):
c, err := p.parseConstant()
if err != nil {
return nil, err
}
decl.Constants = append(decl.Constants, c)
case p.isNestedTypeStart():
nested, err := p.parseInterfaceMemberDefinition()
if err != nil {
return nil, err
}
decl.NestedTypes = append(decl.NestedTypes, nested)
default:
f, err := p.parseField()
if err != nil {
return nil, err
}
decl.Fields = append(decl.Fields, f)
}
}
if _, err := p.expect(TokenRBrace); err != nil {
return nil, err
}
return decl, nil
}
func (p *parserState) parseConstant() (*ConstantDecl, error) {
tok, err := p.expect(TokenConst)
if err != nil {
return nil, err
}
typ, err := p.parseTypeSpecifier()
if err != nil {
return nil, err
}
nameTok, err := p.expect(TokenIdent)
if err != nil {
return nil, err
}
if _, err := p.expect(TokenAssign); err != nil {
return nil, err
}
val, err := p.parseConstExpr()
if err != nil {
return nil, err
}
if _, err := p.expect(TokenSemicolon); err != nil {
return nil, err
}
return &ConstantDecl{
Pos: tok.Pos,
Type: typ,
ConstName: nameTok.Value,
Value: val,
}, nil
}
func (p *parserState) parseTypeSpecifier() (*TypeSpecifier, error) {
annots, err := p.parseAnnotations()
if err != nil {
return nil, err
}
pos := p.cur.Pos
// The type name. "void" is also valid as a return type.
var name string
if p.at(TokenVoid) {
name = "void"
p.advance()
} else {
name, err = p.parseDottedName()
if err != nil {
return nil, err
}
}
ts := &TypeSpecifier{
Pos: pos,
Annots: annots,
Name: name,
}
// Generic type arguments: <T, U>
if p.at(TokenLAngle) {
p.advance()
for {
arg, err := p.parseTypeSpecifier()
if err != nil {
return nil, err
}
ts.TypeArgs = append(ts.TypeArgs, arg)
if !p.at(TokenComma) {
break
}
p.advance()
}
if err := p.expectRAngle(); err != nil {
return nil, err
}
}
// Array suffix: [], [N], or [CONST_NAME]
if p.at(TokenLBracket) {
p.advance()
ts.IsArray = true
switch {
case p.at(TokenIntLiteral):
tok := p.advance()
ts.FixedSize = tok.Value
case p.at(TokenIdent):
tok := p.advance()
ts.FixedSize = tok.Value
}
if _, err := p.expect(TokenRBracket); err != nil {
return nil, err
}
}
return ts, nil
}
func (p *parserState) parseAnnotations() ([]*Annotation, error) {
var annots []*Annotation
for p.at(TokenAnnotation) {
a, err := p.parseAnnotation()
if err != nil {
return nil, err
}
annots = append(annots, a)
}
return annots, nil
}
func (p *parserState) parseAnnotation() (*Annotation, error) {
tok := p.advance() // TokenAnnotation
a := &Annotation{
Pos: tok.Pos,
Name: tok.Value,
}
// Optional parameters in parentheses.
if p.at(TokenLParen) {
p.advance()
a.Params = make(map[string]ConstExpr)
paramIdx := 0
for !p.at(TokenRParen) && !p.at(TokenEOF) {
if paramIdx > 0 {
if _, err := p.expect(TokenComma); err != nil {
return nil, err
}
}
// Determine if this is key=value or a positional value.
// If we see an identifier followed by '=', it's key=value.
// We must distinguish '=' (assign) from '==' (equality).
// peekNextNonWS returns '=' for both, so after consuming
// the ident we verify the token is TokenAssign, not TokenEqEq.
if p.at(TokenIdent) && p.lex.peekNextNonWS() == '=' {
keyTok := p.advance()
if p.at(TokenAssign) {
p.advance() // consume '='
val, err := p.parseConstExpr()
if err != nil {
return nil, err
}
a.Params[keyTok.Value] = val
} else {
// It was '==' not '=': push the ident back as
// part of a value expression. We already consumed
// the ident, so wrap it and parse the rest via
// the equality operator in parseConstExpr.
p.pushback = &p.cur
p.cur = keyTok
val, err := p.parseAnnotationValue()
if err != nil {
return nil, err
}
a.Params["value"] = val
}
} else {
// Positional value: store under "value" key.
val, err := p.parseAnnotationValue()
if err != nil {
return nil, err
}
a.Params["value"] = val
}
paramIdx++
}
if _, err := p.expect(TokenRParen); err != nil {
return nil, err
}
}
return a, nil
}
// parseAnnotationValue parses an annotation value, which can be a constant
// expression or a brace-enclosed list of values like {"a", "b"}.
func (p *parserState) parseAnnotationValue() (ConstExpr, error) {
return p.parseConstExpr()
}
// parseInterfaceMemberDefinition parses a nested type definition inside an
// interface, parcelable, or union body. It handles leading annotations and
// the "oneway interface" pattern.
func (p *parserState) parseInterfaceMemberDefinition() (Definition, error) {
annots, err := p.parseAnnotations()
if err != nil {
return nil, err
}
// Handle "oneway interface" pattern.
if p.at(TokenOneway) {
return p.parseInterface(annots, true)
}
return p.parseNestedDefinition(annots)
}
// peekNextTokenKind peeks at the next token kind without consuming it. It saves
// and restores the lexer state.
func (p *parserState) peekNextTokenKind() TokenKind {
savedOffset := p.lex.Offset
savedLine := p.lex.Line
savedColumn := p.lex.Column
defer func() {
p.lex.Offset = savedOffset
p.lex.Line = savedLine
p.lex.Column = savedColumn
}()
tok := p.lex.Next()
return tok.Kind
}
// isNestedTypeKeyword returns true if the given token kind is a type keyword
// that can start a nested type definition.
func isNestedTypeKeyword(kind TokenKind) bool {
switch kind {
case TokenEnum, TokenParcelable, TokenUnion, TokenInterface:
return true
}
return false
}
// parseNestedDefinition parses a nested type definition (enum, parcelable,
// union, or interface) inside another type body.
func (p *parserState) parseNestedDefinition(
annots []*Annotation,
) (Definition, error) {
switch p.cur.Kind {
case TokenEnum:
return p.parseEnum(annots)
case TokenParcelable:
return p.parseParcelable(annots)
case TokenUnion:
return p.parseUnion(annots)
case TokenInterface:
return p.parseInterface(annots, false)
default:
return nil, fmt.Errorf(
"%s: expected nested type definition, got %s (%q)",
p.cur.Pos, p.cur.Kind, p.cur.Value,
)
}
}
// isForeignHeaderDirective returns true if the given identifier is a foreign
// language header directive used in forward-declared parcelables.
func isForeignHeaderDirective(name string) bool {
switch name {