+++ /dev/null
-/*
- * This file is part of lanterna (http://code.google.com/p/lanterna/).
- *
- * lanterna is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program 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 Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- *
- * Copyright (C) 2010-2015 Martin
- */
-package com.googlecode.lanterna.screen;
-
-/**
- * What to do about the tab character when putting on a {@code Screen}. Since tabs are a bit special, their meaning
- * depends on which column the cursor is in when it's printed, we'll need to have some way to tell the Screen what to
- * do when encountering a tab character.
- *
- * @author martin
- */
-public enum TabBehaviour {
- /**
- * Tab characters are not replaced, this will probably have undefined and weird behaviour!
- */
- IGNORE(null, null),
- /**
- * Tab characters are replaced with a single blank space, no matter where the tab was placed.
- */
- CONVERT_TO_ONE_SPACE(1, null),
- /**
- * Tab characters are replaced with two blank spaces, no matter where the tab was placed.
- */
- CONVERT_TO_TWO_SPACES(2, null),
- /**
- * Tab characters are replaced with three blank spaces, no matter where the tab was placed.
- */
- CONVERT_TO_THREE_SPACES(3, null),
- /**
- * Tab characters are replaced with four blank spaces, no matter where the tab was placed.
- */
- CONVERT_TO_FOUR_SPACES(4, null),
- /**
- * Tab characters are replaced with eight blank spaces, no matter where the tab was placed.
- */
- CONVERT_TO_EIGHT_SPACES(8, null),
- /**
- * Tab characters are replaced with enough space characters to reach the next column index that is evenly divisible
- * by 4, simulating a normal tab character when placed inside a text document.
- */
- ALIGN_TO_COLUMN_4(null, 4),
- /**
- * Tab characters are replaced with enough space characters to reach the next column index that is evenly divisible
- * by 8, simulating a normal tab character when placed inside a text document.
- */
- ALIGN_TO_COLUMN_8(null, 8),
- ;
-
- private final Integer replaceFactor;
- private final Integer alignFactor;
-
- TabBehaviour(Integer replaceFactor, Integer alignFactor) {
- this.replaceFactor = replaceFactor;
- this.alignFactor = alignFactor;
- }
-
- /**
- * Given a string, being placed on the screen at column X, returns the same string with all tab characters (\t)
- * replaced according to this TabBehaviour.
- * @param string String that is going to be put to the screen, potentially containing tab characters
- * @param columnIndex Column on the screen where the first character of the string is going to end up
- * @return The input string with all tab characters replaced with spaces, according to this TabBehaviour
- */
- public String replaceTabs(String string, int columnIndex) {
- int tabPosition = string.indexOf('\t');
- while(tabPosition != -1) {
- String tabReplacementHere = getTabReplacement(columnIndex + tabPosition);
- string = string.substring(0, tabPosition) + tabReplacementHere + string.substring(tabPosition + 1);
- tabPosition += tabReplacementHere.length();
- tabPosition = string.indexOf('\t', tabPosition);
- }
- return string;
- }
-
- /**
- * Returns the String that can replace a tab at the specified position, according to this TabBehaviour.
- * @param columnIndex Column index of where the tab character is placed
- * @return String consisting of 1 or more space character
- */
- public String getTabReplacement(int columnIndex) {
- int replaceCount;
- StringBuilder replace = new StringBuilder();
- if(replaceFactor != null) {
- replaceCount = replaceFactor;
- }
- else if (alignFactor != null) {
- replaceCount = alignFactor - (columnIndex % alignFactor);
- }
- else {
- return "\t";
- }
- for(int i = 0; i < replaceCount; i++) {
- replace.append(" ");
- }
- return replace.toString();
- }
-}