src/Tools/jEdit/src/text_structure.scala
author wenzelm
Mon, 11 Jul 2016 14:25:06 +0200
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/*  Title:      Tools/jEdit/src/text_structure.scala
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    Author:     Makarius
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Text structure based on Isabelle/Isar outer syntax.
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*/
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package isabelle.jedit
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import isabelle._
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import org.gjt.sp.jedit.indent.{IndentRule, IndentAction}
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import org.gjt.sp.jedit.textarea.{TextArea, StructureMatcher, Selection}
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import org.gjt.sp.jedit.buffer.JEditBuffer
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import org.gjt.sp.jedit.Buffer
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object Text_Structure
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{
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  /* token navigator */
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  class Navigator(syntax: Outer_Syntax, buffer: Buffer)
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  {
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    val limit = PIDE.options.value.int("jedit_structure_limit") max 0
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    def iterator(line: Int, lim: Int = limit): Iterator[Text.Info[Token]] =
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      Token_Markup.line_token_iterator(syntax, buffer, line, line + lim).
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        filter(_.info.is_proper)
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    def reverse_iterator(line: Int, lim: Int = limit): Iterator[Text.Info[Token]] =
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      Token_Markup.line_token_reverse_iterator(syntax, buffer, line, line - lim).
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        filter(_.info.is_proper)
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  }
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  /* indentation */
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  object Indent_Rule extends IndentRule
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  {
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    private val keyword_open = Keyword.theory_goal ++ Keyword.proof_open
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    private val keyword_close = Keyword.proof_close
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    def apply(buffer: JEditBuffer, current_line: Int, prev_line: Int, prev_prev_line: Int,
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      actions: java.util.List[IndentAction])
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    {
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      Isabelle.buffer_syntax(buffer) match {
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        case Some(syntax) if buffer.isInstanceOf[Buffer] =>
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          val keywords = syntax.keywords
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          val nav = new Navigator(syntax, buffer.asInstanceOf[Buffer])
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          def head_token(line: Int): Option[Token] =
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            nav.iterator(line, 1).toStream.headOption.map(_.info)
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          def head_is_quasi_command(line: Int): Boolean =
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            head_token(line) match {
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              case None => false
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              case Some(tok) => keywords.is_quasi_command(tok)
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            }
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          def prev_command: Option[Token] =
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            nav.reverse_iterator(prev_line, 1).
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              collectFirst({ case Text.Info(_, tok) if tok.is_command => tok })
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          def prev_span: Iterator[Token] =
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            nav.reverse_iterator(prev_line).map(_.info).takeWhile(tok => !tok.is_command)
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          def line_indent(line: Int): Int =
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            if (line < 0 || line >= buffer.getLineCount) 0
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            else buffer.getCurrentIndentForLine(line, null)
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          val indent_size = buffer.getIndentSize
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          def indent_indent(tok: Token): Int =
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            if (keywords.is_command(tok, keyword_open)) indent_size
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            else if (keywords.is_command(tok, keyword_close)) - indent_size
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            else 0
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          def indent_offset(tok: Token): Int =
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            if (keywords.is_command(tok, Keyword.proof_enclose)) indent_size
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            else if (tok.is_begin) indent_size
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            else 0
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          def indent_extra: Int =
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            if (prev_span.exists(keywords.is_quasi_command(_))) indent_size
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            else 0
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          def indent_structure: Int =
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            nav.reverse_iterator(current_line - 1).scanLeft((0, false))(
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              { case ((ind, _), Text.Info(range, tok)) =>
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                  val ind1 = ind + indent_indent(tok)
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                  if (tok.is_command) {
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                    val line = buffer.getLineOfOffset(range.start)
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                    if (head_token(line) == Some(tok))
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                      (ind1 + indent_offset(tok) + line_indent(line), true)
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                    else (ind1, false)
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                  }
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                  else (ind1, false)
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              }).collectFirst({ case (i, true) => i }).getOrElse(0)
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          def nesting(it: Iterator[Token], open: Token => Boolean, close: Token => Boolean): Int =
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            (0 /: it)({ case (d, tok) => if (open(tok)) d + 1 else if (close(tok)) d - 1 else d })
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          def indent_begin: Int =
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            (nesting(nav.iterator(current_line - 1, 1).map(_.info), _.is_begin, _.is_end) max 0) *
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              indent_size
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          val indent =
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            head_token(current_line) match {
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              case None => indent_structure + indent_extra
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              case Some(tok) =>
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                if (keywords.is_command(tok, Keyword.theory)) indent_begin
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                else if (tok.is_command) indent_structure + indent_begin - indent_offset(tok)
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                else {
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                  prev_command match {
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                    case None =>
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                      val extra =
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                        (keywords.is_quasi_command(tok), head_is_quasi_command(prev_line)) match {
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                          case (true, true) | (false, false) => 0
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                          case (true, false) => - indent_extra
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                          case (false, true) => indent_extra
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                        }
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                      line_indent(prev_line) - indent_offset(tok) + extra
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                    case Some(prev_tok) =>
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                      indent_structure - indent_offset(tok) - indent_offset(prev_tok) -
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                      indent_indent(prev_tok) + indent_size
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                  }
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               }
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            }
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          actions.clear()
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          actions.add(new IndentAction.AlignOffset(indent max 0))
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        case _ =>
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      }
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    }
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  }
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  /* structure matching */
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  object Matcher extends StructureMatcher
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  {
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    private def find_block(
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      open: Token => Boolean,
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      close: Token => Boolean,
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      reset: Token => Boolean,
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      restrict: Token => Boolean,
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      it: Iterator[Text.Info[Token]]): Option[(Text.Range, Text.Range)] =
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    {
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      val range1 = it.next.range
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      it.takeWhile(info => !info.info.is_command || restrict(info.info)).
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        scanLeft((range1, 1))(
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          { case ((r, d), Text.Info(range, tok)) =>
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              if (open(tok)) (range, d + 1)
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              else if (close(tok)) (range, d - 1)
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              else if (reset(tok)) (range, 0)
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              else (r, d) }
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        ).collectFirst({ case (range2, 0) => (range1, range2) })
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    }
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    private def find_pair(text_area: TextArea): Option[(Text.Range, Text.Range)] =
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    {
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      val buffer = text_area.getBuffer
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      val caret_line = text_area.getCaretLine
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      val caret = text_area.getCaretPosition
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      Isabelle.buffer_syntax(text_area.getBuffer) match {
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        case Some(syntax) if buffer.isInstanceOf[Buffer] =>
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          val keywords = syntax.keywords
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          val nav = new Navigator(syntax, buffer.asInstanceOf[Buffer])
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          def caret_iterator(): Iterator[Text.Info[Token]] =
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            nav.iterator(caret_line).dropWhile(info => !info.range.touches(caret))
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          def reverse_caret_iterator(): Iterator[Text.Info[Token]] =
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            nav.reverse_iterator(caret_line).dropWhile(info => !info.range.touches(caret))
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          nav.iterator(caret_line, 1).find(info => info.range.touches(caret))
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          match {
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            case Some(Text.Info(range1, tok)) if keywords.is_command(tok, Keyword.theory_goal) =>
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              find_block(
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                keywords.is_command(_, Keyword.proof_goal),
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                keywords.is_command(_, Keyword.qed),
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                keywords.is_command(_, Keyword.qed_global),
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                t =>
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                  keywords.is_command(t, Keyword.diag) ||
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                  keywords.is_command(t, Keyword.proof),
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                caret_iterator())
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            case Some(Text.Info(range1, tok)) if keywords.is_command(tok, Keyword.proof_goal) =>
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              find_block(
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                keywords.is_command(_, Keyword.proof_goal),
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                keywords.is_command(_, Keyword.qed),
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                _ => false,
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                t =>
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                  keywords.is_command(t, Keyword.diag) ||
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                  keywords.is_command(t, Keyword.proof),
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                caret_iterator())
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            case Some(Text.Info(range1, tok)) if keywords.is_command(tok, Keyword.qed_global) =>
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              reverse_caret_iterator().find(info => keywords.is_command(info.info, Keyword.theory))
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              match {
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                case Some(Text.Info(range2, tok))
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                if keywords.is_command(tok, Keyword.theory_goal) => Some((range1, range2))
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                case _ => None
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              }
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            case Some(Text.Info(range1, tok)) if keywords.is_command(tok, Keyword.qed) =>
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              find_block(
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                keywords.is_command(_, Keyword.qed),
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                t =>
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                  keywords.is_command(t, Keyword.proof_goal) ||
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                  keywords.is_command(t, Keyword.theory_goal),
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                _ => false,
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                t =>
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                  keywords.is_command(t, Keyword.diag) ||
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                  keywords.is_command(t, Keyword.proof) ||
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                  keywords.is_command(t, Keyword.theory_goal),
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                reverse_caret_iterator())
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            case Some(Text.Info(range1, tok)) if tok.is_begin =>
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              find_block(_.is_begin, _.is_end, _ => false, _ => true, caret_iterator())
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            case Some(Text.Info(range1, tok)) if tok.is_end =>
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              find_block(_.is_end, _.is_begin, _ => false, _ => true, reverse_caret_iterator())
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              match {
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                case Some((_, range2)) =>
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                  reverse_caret_iterator().
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                    dropWhile(info => info.range != range2).
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                    dropWhile(info => info.range == range2).
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                    find(info => info.info.is_command || info.info.is_begin)
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                  match {
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                    case Some(Text.Info(range3, tok)) =>
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                      if (keywords.is_command(tok, Keyword.theory_block)) Some((range1, range3))
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                      else Some((range1, range2))
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                    case None => None
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                  }
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                case None => None
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              }
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            case _ => None
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          }
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        case _ => None
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      }
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    }
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    def getMatch(text_area: TextArea): StructureMatcher.Match =
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      find_pair(text_area) match {
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        case Some((_, range)) =>
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          val line = text_area.getBuffer.getLineOfOffset(range.start)
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          new StructureMatcher.Match(Matcher, line, range.start, line, range.stop)
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        case None => null
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      }
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    def selectMatch(text_area: TextArea)
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    {
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      def get_span(offset: Text.Offset): Option[Text.Range] =
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        for {
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          syntax <- Isabelle.buffer_syntax(text_area.getBuffer)
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          span <- Token_Markup.command_span(syntax, text_area.getBuffer, offset)
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        } yield span.range
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      find_pair(text_area) match {
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        case Some((r1, r2)) =>
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          (get_span(r1.start), get_span(r2.start)) match {
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            case (Some(range1), Some(range2)) =>
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              val start = range1.start min range2.start
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              val stop = range1.stop max range2.stop
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              text_area.moveCaretPosition(stop, false)
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              if (!text_area.isMultipleSelectionEnabled) text_area.selectNone
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              text_area.addToSelection(new Selection.Range(start, stop))
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            case _ =>
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          }
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        case None =>
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      }
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    }
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  }
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}