content: /*
   *  This file is part of AndroidIDE.
   *
   *  AndroidIDE is free software: you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation, either version 3 of the License, or
   *  (at your option) any later version.
   *
   *  AndroidIDE is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *  GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License
   *   along with AndroidIDE.  If not, see <https://www.gnu.org/licenses/>.
   */
  
  package com.itsaky.androidide.lsp.java.visitors;
  
  import openjdk.source.tree.CompilationUnitTree;
  import openjdk.source.tree.VariableTree;
  import openjdk.source.util.JavacTask;
  import openjdk.source.util.SourcePositions;
  import openjdk.source.util.TreeScanner;
  import openjdk.source.util.Trees;
  
  public class FindVariableAtCursor extends TreeScanner<VariableTree, Integer> {
    private final SourcePositions pos;
    private CompilationUnitTree root;
  
    public FindVariableAtCursor(JavacTask task) {
      pos = Trees.instance(task).getSourcePositions();
    }
  
    @Override
    public VariableTree reduce(VariableTree r1, VariableTree r2) {
      if (r1 != null) return r1;
      return r2;
    }
  
    @Override
    public VariableTree visitCompilationUnit(CompilationUnitTree t, Integer find) {
      root = t;
      return super.visitCompilationUnit(t, find);
    }
  
    @Override
    public VariableTree visitVariable(VariableTree t, Integer find) {
      VariableTree smaller = super.visitVariable(t, find);
      if (smaller != null) {
        return smaller;
      }
      if (pos.getStartPosition(root, t) <= find && find < pos.getEndPosition(root, t)) {
        return t;
      }
      return null;
    }
  }
  