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/* Title: Tools/VSCode/src/document_model.scala
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Author: Makarius
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Document model for line-oriented text.
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*/
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package isabelle.vscode
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import isabelle._
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import scala.util.parsing.input.CharSequenceReader
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case class Document_Model(
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session: Session, doc: Line.Document, node_name: Document.Node.Name,
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changed: Boolean = true)
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{
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/* header */
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def is_theory: Boolean = node_name.is_theory
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lazy val node_header: Document.Node.Header =
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if (is_theory) {
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val toks = Token.explode(Thy_Header.bootstrap_syntax.keywords, doc.text)
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val toks1 = toks.dropWhile(tok => !tok.is_command(Thy_Header.THEORY))
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toks1.iterator.zipWithIndex.collectFirst({ case (tok, i) if tok.is_begin => i }) match {
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case Some(i) =>
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session.resources.check_thy_reader("", node_name,
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new CharSequenceReader(toks1.take(i + 1).map(_.source).mkString), Token.Pos.command)
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case None => Document.Node.no_header
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}
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}
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else Document.Node.no_header
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/* edits */
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def text_edits: List[Text.Edit] =
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if (changed) List(Text.Edit.insert(0, doc.text)) else Nil
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def node_edits: List[Document.Edit_Text] =
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if (changed) {
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List(session.header_edit(node_name, node_header),
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node_name -> Document.Node.Clear(),
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node_name -> Document.Node.Edits(text_edits),
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node_name ->
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Document.Node.Perspective(true, Text.Perspective.full, Document.Node.Overlays.empty))
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}
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else Nil
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def unchanged: Document_Model = if (changed) copy(changed = false) else this
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/* snapshot */
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def snapshot(): Document.Snapshot = session.snapshot(node_name, text_edits)
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}
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