1 /* Title: Pure/Thy/thy_header.scala
4 Theory headers -- independent of outer syntax.
10 import scala.collection.mutable
11 import scala.util.parsing.input.{Reader, CharSequenceReader}
20 val IMPORTS = "imports"
24 val lexicon = Scan.Lexicon("%", "(", ")", ";", BEGIN, HEADER, IMPORTS, THEORY, USES)
26 sealed case class Header(val name: String, val imports: List[String], val uses: List[String])
30 class Thy_Header(symbols: Symbol.Interpretation) extends Outer_Parse.Parser
37 val header: Parser[Header] =
39 val file_name = atom("file name", _.is_name) ^^ Library.decode_permissive_utf8
40 val theory_name = atom("theory name", _.is_name) ^^ Library.decode_permissive_utf8
43 keyword("(") ~! (file_name ~ keyword(")")) ^^ { case _ ~ (x ~ _) => x } | file_name
45 val uses = opt(keyword(USES) ~! (rep1(file))) ^^ { case None => Nil case Some(_ ~ xs) => xs }
48 theory_name ~ (keyword(IMPORTS) ~! (rep1(theory_name) ~ uses ~ keyword(BEGIN))) ^^
49 { case x ~ (_ ~ (ys ~ zs ~ _)) => Header(x, ys, zs) }
51 (keyword(HEADER) ~ tags) ~!
52 ((doc_source ~ rep(keyword(";")) ~ keyword(THEORY) ~ tags) ~> args) ^^ { case _ ~ x => x } |
53 (keyword(THEORY) ~ tags) ~! args ^^ { case _ ~ x => x }
57 /* read -- lazy scanning */
59 def read(file: File): Header =
61 val token = lexicon.token(symbols, _ => false)
62 val toks = new mutable.ListBuffer[Outer_Lex.Token]
64 def scan_to_begin(in: Reader[Char])
67 case lexicon.Success(tok, rest) =>
69 if (!(tok.kind == Outer_Lex.Token_Kind.KEYWORD && tok.content == BEGIN))
74 val reader = Scan.byte_reader(file)
75 try { scan_to_begin(reader) } finally { reader.close }
77 parse(commit(header), Outer_Lex.reader(toks.toList)) match {
78 case Success(result, _) => result
79 case bad => error(bad.toString)