/* Title: Pure/Thy/thy_info.scala
Author: Makarius
Theory and file dependencies.
*/
package isabelle
class Thy_Info(resources: Resources)
{
/* messages */
private def show_path(names: List[Document.Node.Name]): String =
names.map(name => quote(name.theory)).mkString(" via ")
private def cycle_msg(names: List[Document.Node.Name]): String =
"Cyclic dependency of " + show_path(names)
private def required_by(initiators: List[Document.Node.Name]): String =
if (initiators.isEmpty) ""
else "\n(required by " + show_path(initiators.reverse) + ")"
/* dependencies */
object Dependencies
{
val empty = new Dependencies(Nil, Nil, Nil, Set.empty)
}
final class Dependencies private(
rev_entries: List[Document.Node.Entry],
val keywords: Thy_Header.Keywords,
val abbrevs: Thy_Header.Abbrevs,
val seen: Set[Document.Node.Name])
{
def :: (entry: Document.Node.Entry): Dependencies =
new Dependencies(
entry :: rev_entries,
entry.header.keywords ::: keywords,
entry.header.abbrevs ::: abbrevs,
seen)
def + (name: Document.Node.Name): Dependencies =
new Dependencies(rev_entries, keywords, abbrevs, seen + name)
def entries: List[Document.Node.Entry] = rev_entries.reverse
def errors: List[String] = entries.flatMap(_.header.errors)
lazy val syntax: Outer_Syntax =
resources.session_base.syntax.add_keywords(keywords).add_abbrevs(abbrevs)
def loaded_theories: Set[String] =
resources.session_base.loaded_theories ++ rev_entries.map(_.name.theory)
def loaded_files: List[(String, List[Path])] =
{
val names = entries.map(_.name)
names.map(_.theory) zip
Par_List.map((e: () => List[Path]) => e(), names.map(resources.loaded_files(syntax, _)))
}
override def toString: String = entries.toString
}
private def require_thys(initiators: List[Document.Node.Name], required: Dependencies,
thys: List[(Document.Node.Name, Position.T)]): Dependencies =
(required /: thys)(require_thy(initiators, _, _))
private def require_thy(initiators: List[Document.Node.Name], required: Dependencies,
thy: (Document.Node.Name, Position.T)): Dependencies =
{
val (name, pos) = thy
def message: String =
"The error(s) above occurred for theory " + quote(name.theory) +
required_by(initiators) + Position.here(pos)
val required1 = required + name
if (required.seen(name)) required
else if (resources.session_base.loaded_theory(name)) required1
else {
try {
if (initiators.contains(name)) error(cycle_msg(initiators))
val header =
try { resources.check_thy(name, Token.Pos.file(name.node)).cat_errors(message) }
catch { case ERROR(msg) => cat_error(msg, message) }
Document.Node.Entry(name, header) ::
require_thys(name :: initiators, required1, header.imports)
}
catch {
case e: Throwable =>
Document.Node.Entry(name, Document.Node.bad_header(Exn.message(e))) :: required1
}
}
}
def dependencies(thys: List[(Document.Node.Name, Position.T)]): Dependencies =
require_thys(Nil, Dependencies.empty, thys)
}