| 1 | /* |
| 2 | * Jexer - Java Text User Interface |
| 3 | * |
| 4 | * The MIT License (MIT) |
| 5 | * |
| 6 | * Copyright (C) 2017 Kevin Lamonte |
| 7 | * |
| 8 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 9 | * copy of this software and associated documentation files (the "Software"), |
| 10 | * to deal in the Software without restriction, including without limitation |
| 11 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| 12 | * and/or sell copies of the Software, and to permit persons to whom the |
| 13 | * Software is furnished to do so, subject to the following conditions: |
| 14 | * |
| 15 | * The above copyright notice and this permission notice shall be included in |
| 16 | * all copies or substantial portions of the Software. |
| 17 | * |
| 18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 20 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 21 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 22 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| 23 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
| 24 | * DEALINGS IN THE SOFTWARE. |
| 25 | * |
| 26 | * @author Kevin Lamonte [kevin.lamonte@gmail.com] |
| 27 | * @version 1 |
| 28 | */ |
| 29 | package jexer.teditor; |
| 30 | |
| 31 | import java.util.ArrayList; |
| 32 | import java.util.List; |
| 33 | |
| 34 | /** |
| 35 | * A Document represents a text file, as a collection of lines. |
| 36 | */ |
| 37 | public class Document { |
| 38 | |
| 39 | /** |
| 40 | * The list of lines. |
| 41 | */ |
| 42 | private ArrayList<Line> lines = new ArrayList<Line>(); |
| 43 | |
| 44 | /** |
| 45 | * The current line number being edited. Note that this is 0-based, the |
| 46 | * first line is line number 0. |
| 47 | */ |
| 48 | private int lineNumber = 0; |
| 49 | |
| 50 | /** |
| 51 | * The overwrite flag. When true, characters overwrite data. |
| 52 | */ |
| 53 | private boolean overwrite = false; |
| 54 | |
| 55 | /** |
| 56 | * Get the overwrite flag. |
| 57 | * |
| 58 | * @return true if addChar() overwrites data, false if it inserts |
| 59 | */ |
| 60 | public boolean getOverwrite() { |
| 61 | return overwrite; |
| 62 | } |
| 63 | |
| 64 | /** |
| 65 | * Set the overwrite flag. |
| 66 | * |
| 67 | * @param overwrite true if addChar() should overwrite data, false if it |
| 68 | * should insert |
| 69 | */ |
| 70 | public void setOverwrite(final boolean overwrite) { |
| 71 | this.overwrite = overwrite; |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * Get the current line number being edited. |
| 76 | * |
| 77 | * @return the line number. Note that this is 0-based: 0 is the first |
| 78 | * line. |
| 79 | */ |
| 80 | public int getLineNumber() { |
| 81 | return lineNumber; |
| 82 | } |
| 83 | |
| 84 | /** |
| 85 | * Get a specific line by number. |
| 86 | * |
| 87 | * @param lineNumber the line number. Note that this is 0-based: 0 is |
| 88 | * the first line. |
| 89 | * @return the line |
| 90 | */ |
| 91 | public Line getLine(final int lineNumber) { |
| 92 | return lines.get(lineNumber); |
| 93 | } |
| 94 | |
| 95 | /** |
| 96 | * Set the current line number being edited. |
| 97 | * |
| 98 | * @param n the line number. Note that this is 0-based: 0 is the first |
| 99 | * line. |
| 100 | */ |
| 101 | public void setLineNumber(final int n) { |
| 102 | if ((n < 0) || (n > lines.size())) { |
| 103 | throw new IndexOutOfBoundsException("Line size is " + lines.size() + |
| 104 | ", requested index " + n); |
| 105 | } |
| 106 | lineNumber = n; |
| 107 | } |
| 108 | |
| 109 | /** |
| 110 | * Increment the line number by one. If at the last line, do nothing. |
| 111 | */ |
| 112 | public void down() { |
| 113 | if (lineNumber < lines.size() - 1) { |
| 114 | lineNumber++; |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | /** |
| 119 | * Increment the line number by n. If n would go past the last line, |
| 120 | * increment only to the last line. |
| 121 | * |
| 122 | * @param n the number of lines to increment by |
| 123 | */ |
| 124 | public void down(final int n) { |
| 125 | lineNumber += n; |
| 126 | if (lineNumber > lines.size() - 1) { |
| 127 | lineNumber = lines.size() - 1; |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | /** |
| 132 | * Decrement the line number by one. If at the first line, do nothing. |
| 133 | */ |
| 134 | public void up() { |
| 135 | if (lineNumber > 0) { |
| 136 | lineNumber--; |
| 137 | } |
| 138 | } |
| 139 | |
| 140 | /** |
| 141 | * Decrement the line number by n. If n would go past the first line, |
| 142 | * decrement only to the first line. |
| 143 | * |
| 144 | * @param n the number of lines to decrement by |
| 145 | */ |
| 146 | public void up(final int n) { |
| 147 | lineNumber -= n; |
| 148 | if (lineNumber < 0) { |
| 149 | lineNumber = 0; |
| 150 | } |
| 151 | } |
| 152 | |
| 153 | /** |
| 154 | * Decrement the cursor by one. If at the first column, do nothing. |
| 155 | */ |
| 156 | public void left() { |
| 157 | lines.get(lineNumber).left(); |
| 158 | } |
| 159 | |
| 160 | /** |
| 161 | * Increment the cursor by one. If at the last column, do nothing. |
| 162 | */ |
| 163 | public void right() { |
| 164 | lines.get(lineNumber).right(); |
| 165 | } |
| 166 | |
| 167 | /** |
| 168 | * Go to the first column of this line. |
| 169 | */ |
| 170 | public void home() { |
| 171 | lines.get(lineNumber).home(); |
| 172 | } |
| 173 | |
| 174 | /** |
| 175 | * Go to the last column of this line. |
| 176 | */ |
| 177 | public void end() { |
| 178 | lines.get(lineNumber).end(); |
| 179 | } |
| 180 | |
| 181 | /** |
| 182 | * Delete the character under the cursor. |
| 183 | */ |
| 184 | public void del() { |
| 185 | lines.get(lineNumber).del(); |
| 186 | } |
| 187 | |
| 188 | /** |
| 189 | * Delete the character immediately preceeding the cursor. |
| 190 | */ |
| 191 | public void backspace() { |
| 192 | lines.get(lineNumber).backspace(); |
| 193 | } |
| 194 | |
| 195 | /** |
| 196 | * Replace or insert a character at the cursor, depending on overwrite |
| 197 | * flag. |
| 198 | * |
| 199 | * @param ch the character to replace or insert |
| 200 | */ |
| 201 | public void addChar(final char ch) { |
| 202 | lines.get(lineNumber).addChar(ch); |
| 203 | } |
| 204 | |
| 205 | /** |
| 206 | * Get a (shallow) copy of the list of lines. |
| 207 | * |
| 208 | * @return the list of lines |
| 209 | */ |
| 210 | public List<Line> getLines() { |
| 211 | return new ArrayList<Line>(lines); |
| 212 | } |
| 213 | |
| 214 | /** |
| 215 | * Get the number of lines. |
| 216 | * |
| 217 | * @return the number of lines |
| 218 | */ |
| 219 | public int getLineCount() { |
| 220 | return lines.size(); |
| 221 | } |
| 222 | |
| 223 | /** |
| 224 | * Compute the maximum line length for this document. |
| 225 | * |
| 226 | * @return the number of cells needed to display the longest line |
| 227 | */ |
| 228 | public int getLineLengthMax() { |
| 229 | int n = 0; |
| 230 | for (Line line : lines) { |
| 231 | if (line.getDisplayLength() > n) { |
| 232 | n = line.getDisplayLength(); |
| 233 | } |
| 234 | } |
| 235 | return n; |
| 236 | } |
| 237 | |
| 238 | /** |
| 239 | * Construct a new Document from an existing text string. |
| 240 | * |
| 241 | * @param str the text string |
| 242 | */ |
| 243 | public Document(final String str) { |
| 244 | String [] rawLines = str.split("\n"); |
| 245 | for (int i = 0; i < rawLines.length; i++) { |
| 246 | lines.add(new Line(rawLines[i])); |
| 247 | } |
| 248 | } |
| 249 | |
| 250 | } |