src/Pure/Isar/outer_syntax.scala
author wenzelm
Sat Aug 04 16:56:42 2012 +0200 (2012-08-04)
changeset 48671 951bc4c3ee17
parent 48660 730ca503e955
child 48706 e2b512024eab
permissions -rw-r--r--
refined outer syntax;
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/*  Title:      Pure/Isar/outer_syntax.scala
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    Author:     Makarius
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Isabelle/Isar outer syntax.
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*/
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package isabelle
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import scala.util.parsing.input.{Reader, CharSequenceReader}
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import scala.collection.mutable
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object Outer_Syntax
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{
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  def quote_string(str: String): String =
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  {
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    val result = new StringBuilder(str.length + 10)
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    result += '"'
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    for (s <- Symbol.iterator(str)) {
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      if (s.length == 1) {
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        val c = s(0)
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        if (c < 32 && c != YXML.X && c != YXML.Y || c == '\\' || c == '"') {
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          result += '\\'
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          if (c < 10) result += '0'
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          if (c < 100) result += '0'
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          result ++= (c.asInstanceOf[Int].toString)
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        }
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        else result += c
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      }
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      else result ++= s
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    }
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    result += '"'
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    result.toString
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  }
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  type Decl = (String, Option[(String, List[String])])
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  val empty: Outer_Syntax = new Outer_Syntax()
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  def init(): Outer_Syntax = new Outer_Syntax(completion = Completion.init())
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}
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final class Outer_Syntax private(
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  keywords: Map[String, String] = Map.empty,
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  lexicon: Scan.Lexicon = Scan.Lexicon.empty,
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  val completion: Completion = Completion.empty)
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{
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  override def toString: String =
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    (for ((name, kind) <- keywords) yield {
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      if (kind == Keyword.MINOR) quote(name)
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      else quote(name) + " :: " + quote(kind)
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    }).toList.sorted.mkString("keywords\n  ", " and\n  ", "")
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  def keyword_kind(name: String): Option[String] = keywords.get(name)
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  def + (name: String, kind: String, replace: String): Outer_Syntax =
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    new Outer_Syntax(
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      keywords + (name -> kind),
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      lexicon + name,
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      if (Keyword.control(kind)) completion else completion + (name, replace))
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  def + (name: String, kind: String): Outer_Syntax = this + (name, kind, name)
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  def + (name: String): Outer_Syntax = this + (name, Keyword.MINOR)
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  def + (decl: Outer_Syntax.Decl): Outer_Syntax =
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    decl match {
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      case ((name, Some((kind, _)))) => this + (name, kind)
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      case ((name, None)) => this + name
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    }
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  def is_command(name: String): Boolean =
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    keyword_kind(name) match {
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      case Some(kind) => kind != Keyword.MINOR
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      case None => false
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    }
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  def heading_level(name: String): Option[Int] =
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  {
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    keyword_kind(name) match {
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      case _ if name == "header" => Some(0)
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      case Some(Keyword.THY_HEADING1) => Some(1)
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      case Some(Keyword.THY_HEADING2) | Some(Keyword.PRF_HEADING2) => Some(2)
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      case Some(Keyword.THY_HEADING3) | Some(Keyword.PRF_HEADING3) => Some(3)
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      case Some(Keyword.THY_HEADING4) | Some(Keyword.PRF_HEADING4) => Some(4)
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      case Some(kind) if Keyword.theory(kind) => Some(5)
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      case _ => None
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    }
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  }
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  def heading_level(command: Command): Option[Int] =
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    heading_level(command.name)
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  /* tokenize */
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  def scan(input: Reader[Char]): List[Token] =
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  {
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    import lexicon._
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    parseAll(rep(token(is_command)), input) match {
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      case Success(tokens, _) => tokens
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      case _ => error("Unexpected failure of tokenizing input:\n" + input.source.toString)
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    }
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  }
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  def scan(input: CharSequence): List[Token] =
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    scan(new CharSequenceReader(input))
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  def scan_context(input: CharSequence, context: Scan.Context): (List[Token], Scan.Context) =
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  {
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    import lexicon._
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    var in: Reader[Char] = new CharSequenceReader(input)
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    val toks = new mutable.ListBuffer[Token]
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    var ctxt = context
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    while (!in.atEnd) {
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      parse(token_context(is_command, ctxt), in) match {
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        case Success((x, c), rest) => { toks += x; ctxt = c; in = rest }
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        case NoSuccess(_, rest) =>
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          error("Unexpected failure of tokenizing input:\n" + rest.source.toString)
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      }
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    }
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    (toks.toList, ctxt)
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  }
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}