001////////////////////////////////////////////////////////////////////////////////
002// checkstyle: Checks Java source code for adherence to a set of rules.
003// Copyright (C) 2001-2018 the original author or authors.
004//
005// This library is free software; you can redistribute it and/or
006// modify it under the terms of the GNU Lesser General Public
007// License as published by the Free Software Foundation; either
008// version 2.1 of the License, or (at your option) any later version.
009//
010// This library is distributed in the hope that it will be useful,
011// but WITHOUT ANY WARRANTY; without even the implied warranty of
012// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
013// Lesser General Public License for more details.
014//
015// You should have received a copy of the GNU Lesser General Public
016// License along with this library; if not, write to the Free Software
017// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
018////////////////////////////////////////////////////////////////////////////////
019
020package com.puppycrawl.tools.checkstyle.gui;
021
022import java.util.List;
023
024import com.puppycrawl.tools.checkstyle.api.DetailAST;
025import com.puppycrawl.tools.checkstyle.api.DetailNode;
026import com.puppycrawl.tools.checkstyle.utils.TokenUtil;
027
028/**
029 * Presentation model for CodeSelector.
030 */
031public class CodeSelectorPresentation {
032
033    /** DetailAST or DetailNode node. */
034    private final Object node;
035    /** Mapping. */
036    private final List<Integer> lines2position;
037    /** Selection start position. */
038    private int selectionStart;
039    /** Selection end position. */
040    private int selectionEnd;
041
042    /**
043     * Constructor.
044     * @param ast ast node.
045     * @param lines2position list to map lines.
046     * @noinspection AssignmentOrReturnOfFieldWithMutableType
047     */
048    public CodeSelectorPresentation(DetailAST ast, List<Integer> lines2position) {
049        node = ast;
050        this.lines2position = lines2position;
051    }
052
053    /**
054     * Constructor.
055     * @param node DetailNode node.
056     * @param lines2position list to map lines.
057     * @noinspection AssignmentOrReturnOfFieldWithMutableType
058     */
059    public CodeSelectorPresentation(DetailNode node, List<Integer> lines2position) {
060        this.node = node;
061        this.lines2position = lines2position;
062    }
063
064    /**
065     * Returns selection start position.
066     * @return selection start position.
067     */
068    public int getSelectionStart() {
069        return selectionStart;
070    }
071
072    /**
073     * Returns selection end position.
074     * @return selection end position.
075     */
076    public int getSelectionEnd() {
077        return selectionEnd;
078    }
079
080    /**
081     * Find start and end selection positions from AST line and Column.
082     */
083    public void findSelectionPositions() {
084        if (node instanceof DetailAST) {
085            findSelectionPositions((DetailAST) node);
086        }
087        else {
088            findSelectionPositions((DetailNode) node);
089        }
090    }
091
092    /**
093     * Find start and end selection positions from AST line and Column.
094     * @param ast DetailAST node for which selection finds
095     */
096    private void findSelectionPositions(DetailAST ast) {
097        selectionStart = lines2position.get(ast.getLineNo()) + ast.getColumnNo();
098
099        if (ast.getChildCount() == 0
100                && TokenUtil.getTokenName(ast.getType()).equals(ast.getText())) {
101            selectionEnd = selectionStart;
102        }
103        else {
104            selectionEnd = findLastPosition(ast);
105        }
106    }
107
108    /**
109     * Find start and end selection positions from DetailNode line and Column.
110     * @param detailNode DetailNode node for which selection finds
111     */
112    private void findSelectionPositions(DetailNode detailNode) {
113        selectionStart = lines2position.get(detailNode.getLineNumber())
114                            + detailNode.getColumnNumber();
115
116        selectionEnd = findLastPosition(detailNode);
117    }
118
119    /**
120     * Finds the last position of node without children.
121     * @param astNode DetailAST node.
122     * @return Last position of node without children.
123     */
124    private int findLastPosition(final DetailAST astNode) {
125        final int lastPosition;
126        if (astNode.getChildCount() == 0) {
127            lastPosition = lines2position.get(astNode.getLineNo()) + astNode.getColumnNo()
128                    + astNode.getText().length();
129        }
130        else {
131            lastPosition = findLastPosition(astNode.getLastChild());
132        }
133        return lastPosition;
134    }
135
136    /**
137     * Finds the last position of node without children.
138     * @param detailNode DetailNode node.
139     * @return Last position of node without children.
140     */
141    private int findLastPosition(final DetailNode detailNode) {
142        final int lastPosition;
143        if (detailNode.getChildren().length == 0) {
144            lastPosition = lines2position.get(detailNode.getLineNumber())
145                    + detailNode.getColumnNumber() + detailNode.getText().length();
146        }
147        else {
148            final DetailNode lastChild =
149                    detailNode.getChildren()[detailNode.getChildren().length - 1];
150            lastPosition = findLastPosition(lastChild);
151        }
152        return lastPosition;
153    }
154
155}