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JavaToplevelMtags.scala
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JavaToplevelMtags.scala
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package scala.meta.internal.mtags
import scala.annotation.tailrec
import scala.meta.dialects
import scala.meta.inputs.Input
import scala.meta.inputs.Position
import scala.meta.internal.semanticdb.Language
import scala.meta.internal.semanticdb.SymbolInformation
import scala.meta.internal.tokenizers.Reporter
class JavaToplevelMtags(val input: Input.VirtualFile) extends MtagsIndexer {
import JavaToplevelMtags._
val reporter: Reporter = Reporter(input)
val reader: CharArrayReader =
new CharArrayReader(input, dialects.Scala213, reporter)
override def language: Language = Language.JAVA
override def indexRoot(): Unit = {
if (!input.path.endsWith("module-info.java")) {
reader.nextRawChar()
loop
}
}
def readPackage: List[String] = {
fetchToken // start of file
fetchToken match {
case Token.Package => readPaths.map(_.value)
case _ => Nil
}
}
private def loop: Unit = {
val token = fetchToken
token match {
case Token.EOF =>
case Token.Package =>
val paths = readPaths
paths.foreach { path => pkg(path.value, path.pos) }
loop
case Token.Class | Token.Interface | _: Token.Enum | _: Token.Record =>
fetchToken match {
case Token.Word(v, pos) =>
val kind = token match {
case Token.Interface => SymbolInformation.Kind.INTERFACE
case _ => SymbolInformation.Kind.CLASS
}
withOwner(currentOwner)(tpe(v, pos, kind, 0))
skipBody
loop
case _ =>
loop
}
case _ =>
loop
}
}
@tailrec
private def skipMultilineComment(prevStar: Boolean): Unit = {
reader.nextChar()
if (prevStar) {
if (reader.ch == '/') reader.nextChar()
else skipMultilineComment(prevStar = reader.ch == '*')
} else skipMultilineComment(prevStar = reader.ch == '*')
}
private def fetchToken: Token = {
@tailrec
def quotedLiteral(quote: Char): Token = {
reader.nextChar()
reader.ch match {
case `quote` => Token.Literal
case '\\' =>
reader.nextChar()
quotedLiteral(quote)
case _ => quotedLiteral(quote)
}
}
@tailrec
def kwOrIdent(start: Int, builder: StringBuilder): Token = {
val ch = reader.ch
if (ch != Chars.SU && Character.isJavaIdentifierPart(ch)) {
reader.nextChar()
kwOrIdent(start, builder.append(ch.toChar))
} else if (builder.isEmpty) {
throw new Exception(
s"Unexpected symbol at word pos: '$ch'. Line: '$readCurrentLine'"
)
} else {
val pos = Position.Range(input, start, reader.endCharOffset)
builder.mkString match {
case "package" => Token.Package
case "class" => Token.Class
case "interface" => Token.Interface
case "record" => Token.Record(pos)
case "enum" => Token.Enum(pos)
case ident =>
Token.Word(ident, pos)
}
}
}
def parseToken: (Token, Boolean) = {
val first = reader.ch
first match {
case ',' | '<' | '>' | '&' | '|' | '!' | '=' | '+' | '-' | '*' | '@' |
':' | '?' | '%' | '^' | '~' =>
(Token.SpecialSym, false)
case Chars.SU => (Token.EOF, false)
case '.' => (Token.Dot, false)
case '{' => (Token.LBrace, false)
case '}' => (Token.RBrace, false)
case ';' => (Token.Semicolon, false)
case '(' => (Token.LParen, false)
case ')' => (Token.RParen, false)
case '[' => (Token.LBracket, false)
case ']' => (Token.RBracket, false)
case '"' => (quotedLiteral('"'), false)
case '\'' => (quotedLiteral('\''), false)
case '/' =>
reader.nextChar()
val next = reader.ch
next match {
case '*' =>
skipMultilineComment(prevStar = false)
toNextNonWhiteSpace()
parseToken
case '/' =>
skipLine
toNextNonWhiteSpace()
parseToken
case _ =>
val token = kwOrIdent(
reader.begCharOffset,
new StringBuilder().append(first.toChar).append(next.toChar)
)
(token, true)
}
case _ =>
val token = kwOrIdent(reader.endCharOffset, new StringBuilder(first))
(token, true)
}
}
toNextNonWhiteSpace()
val (t, didNextChar) = parseToken
if (!didNextChar) reader.nextChar()
t
}
private def readPaths: List[Token.WithPos] = {
val builder = List.newBuilder[Token.WithPos]
@tailrec
def loop(): List[Token.WithPos] = {
fetchToken match {
case t: Token.WithPos =>
builder += t
loop()
case Token.Dot => loop()
case _ =>
builder.result()
}
}
loop()
}
private def isWhitespace(ch: Char): Boolean = {
ch match {
case ' ' | '\t' | Chars.CR | Chars.LF | Chars.FF => true
case _ => false
}
}
private def skipBody: Unit = {
@tailrec
def skipToFirstBrace: Unit =
fetchToken match {
case Token.LBrace | Token.EOF => ()
case _ =>
skipToFirstBrace
}
@tailrec
def skipToRbrace(open: Int): Unit = {
fetchToken match {
case Token.RBrace if open == 1 => ()
case Token.RBrace =>
skipToRbrace(open - 1)
case Token.LBrace =>
skipToRbrace(open + 1)
case Token.EOF => ()
case _ =>
skipToRbrace(open)
}
}
skipToFirstBrace
skipToRbrace(1)
}
private def skipLine: Unit =
while ({ val ch = reader.ch; ch != Chars.SU && ch != '\n' })
reader.nextChar()
@tailrec
private def toNextNonWhiteSpace(): Unit = {
if (isWhitespace(reader.ch.toChar)) {
reader.nextChar()
toNextNonWhiteSpace()
}
}
private def readCurrentLine: String = {
def loop(builder: StringBuilder): String = {
val ch = reader.ch.toChar
if (ch == '\n' || ch == Chars.SU)
builder.mkString
else {
val next = builder.append(ch)
reader.nextChar()
loop(next)
}
}
val lineOffset = reader.lineStartOffset
val existing = input.text.substring(lineOffset, reader.endCharOffset)
loop(new StringBuilder().append(existing))
}
}
object JavaToplevelMtags {
sealed trait Token
object Token {
sealed trait WithPos extends Token {
def pos: Position
def value: String
}
case object BOF extends Token
case object EOF extends Token
case object Dot extends Token
case object Package extends Token
case object Class extends Token
case object Interface extends Token
case class Enum(pos: Position) extends WithPos {
val value: String = "enum"
}
case class Record(pos: Position) extends WithPos {
val value: String = "record"
}
case object RBrace extends Token
case object LBrace extends Token
case object RParen extends Token
case object LParen extends Token
case object RBracket extends Token
case object LBracket extends Token
case object Semicolon extends Token
// any allowed symbol like `=` , `-` and others
case object SpecialSym extends Token
case object Literal extends Token
case class Word(value: String, pos: Position) extends WithPos {
override def toString: String =
s"Word($value)"
}
}
}