Mercurial > hg > truffle
annotate graal/com.oracle.max.base/src/com/sun/max/lang/Strings.java @ 4186:71a2cd79c375
Made stdout for mx unbuffered.
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 03 Jan 2012 13:53:38 +0100 |
parents | bc8527f3071c |
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rev | line source |
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1 /* |
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2 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 package com.sun.max.lang; |
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24 |
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25 import java.io.*; |
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26 import java.util.*; |
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27 |
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28 /** |
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29 * Additional String-related operations. |
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30 */ |
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31 public final class Strings { |
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32 |
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33 private Strings() { |
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34 } |
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35 |
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36 /** |
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37 * @param stream |
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38 * the input stream to be read in its entirety and then closed |
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39 * @return the contents of the input stream as a String, with line breaks |
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40 * @throws IOException |
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41 * as usual |
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42 */ |
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43 public static String fromInputStream(InputStream stream) throws IOException { |
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44 final BufferedReader reader = new BufferedReader(new InputStreamReader(stream)); |
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45 final StringBuffer result = new StringBuffer(); |
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46 final String lineSeparator = System.getProperty("line.separator"); |
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47 while (true) { |
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48 final String line = reader.readLine(); |
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49 if (line == null) { |
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50 stream.close(); |
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51 return result.toString(); |
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52 } |
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53 result.append(line); |
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54 result.append(lineSeparator); |
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55 } |
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56 } |
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57 |
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58 public static String firstCharToLowerCase(String s) { |
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59 if (s == null || s.length() == 0) { |
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60 return s; |
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61 } |
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62 return s.substring(0, 1).toLowerCase() + s.substring(1); |
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63 } |
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64 |
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65 public static String firstCharToUpperCase(String s) { |
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66 if (s == null || s.length() == 0) { |
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67 return s; |
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68 } |
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69 return s.substring(0, 1).toUpperCase() + s.substring(1); |
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70 } |
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71 |
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72 public static String times(char ch, int nTimes) { |
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73 if (nTimes <= 0) { |
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74 return ""; |
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75 } |
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76 final char[] chars = new char[nTimes]; |
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77 for (int i = 0; i < nTimes; i++) { |
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78 chars[i] = ch; |
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79 } |
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80 return new String(chars); |
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81 } |
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82 |
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83 private static final char[] SPACES; |
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84 static { |
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85 SPACES = new char[200]; |
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86 java.util.Arrays.fill(SPACES, ' '); |
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87 } |
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88 |
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89 public static String spaces(int nSpaces) { |
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90 if (nSpaces <= 0) { |
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91 return ""; |
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92 } |
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93 if (nSpaces <= SPACES.length) { |
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94 return new String(SPACES, 0, nSpaces); |
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95 } |
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96 return times(' ', nSpaces); |
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97 } |
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98 |
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99 /** |
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100 * @return The String {@code s} padded out to {@code length}, if needed, by appending space characters |
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101 */ |
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102 public static String padLengthWithSpaces(String s, int length) { |
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103 if (s.length() >= length) { |
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104 return s; |
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105 } |
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106 return s + spaces(length - s.length()); |
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107 } |
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108 |
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109 /** |
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110 * @return The string {@code s} padded out to {@code length}, if needed, by prepending space characters |
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111 */ |
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112 public static String padLengthWithSpaces(int length, String s) { |
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113 if (s.length() >= length) { |
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114 return s; |
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115 } |
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116 return spaces(length - s.length()) + s; |
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117 } |
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118 |
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119 private static final char[] ZEROES; |
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120 static { |
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121 ZEROES = new char[200]; |
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122 java.util.Arrays.fill(ZEROES, '0'); |
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123 } |
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124 |
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125 public static String zeroes(int nZeroes) { |
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126 if (nZeroes <= 0) { |
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127 return ""; |
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128 } |
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129 if (nZeroes <= ZEROES.length) { |
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130 return new String(ZEROES, 0, nZeroes); |
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131 } |
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132 return times(' ', nZeroes); |
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133 } |
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134 |
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135 /** |
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136 * @return The String {@code s} padded out to {@code length}, if needed, by appending zero characters |
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137 */ |
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138 public static String padLengthWithZeroes(String s, int length) { |
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139 if (s.length() >= length) { |
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140 return s; |
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141 } |
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142 return s + zeroes(length - s.length()); |
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143 } |
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144 |
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145 /** |
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146 * @return The string {@code s} padded out to {@code length}, if needed, by prepending zero characters |
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147 */ |
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148 public static String padLengthWithZeroes(int length, String s) { |
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149 if (s.length() >= length) { |
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150 return s; |
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151 } |
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152 return zeroes(length - s.length()) + s; |
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153 } |
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154 |
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155 /** |
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156 * Finds the index of the first non-escaped instance of {@code c} in {@code s} starting at {@code fromIndex}. |
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157 * The search takes into account that the escape char (i.e. {@code '\'}) may itself be escaped. |
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158 * |
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159 * @return -1 if the char could not be found |
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160 */ |
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161 public static int indexOfNonEscapedChar(char c, String s, int fromIndex) { |
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162 int index = s.indexOf(c, fromIndex); |
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163 while (index != -1) { |
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164 if (index > 0 && (s.charAt(index - 1) != '\\') || (index > 1 && s.charAt(index - 2) == '\\')) { |
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165 return index; |
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166 } |
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167 index = s.indexOf(c, index + 1); |
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168 } |
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169 return -1; |
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170 } |
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171 |
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172 /** |
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173 * Parses a command line into a string array appropriate for calling {@link Runtime#exec(String[])}. |
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174 * The given command line is tokenized around {@link Character#isWhitespace(char) whitespaces} |
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175 * except for sequences of characters enclosed in non-escaped double quotes (after the double |
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176 * quotes are removed). |
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177 */ |
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178 public static String[] splitCommand(String command) { |
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179 final List<String> parts = new ArrayList<>(); |
3733
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180 |
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181 boolean escapedChar = false; |
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|
182 boolean insideQuotes = false; |
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183 |
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184 final char[] buffer = new char[command.length()]; |
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185 int pos = 0; |
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186 |
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187 for (int index = 0; index < command.length(); ++index) { |
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188 final char ch = command.charAt(index); |
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189 if (escapedChar) { |
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190 escapedChar = false; |
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|
191 } else { |
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192 if (ch == '\\') { |
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193 escapedChar = true; |
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|
194 } else { |
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195 if (insideQuotes) { |
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196 if (ch == '"') { |
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197 insideQuotes = false; |
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198 continue; |
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|
199 } |
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|
200 } else { |
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|
201 if (ch == '"') { |
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|
202 insideQuotes = true; |
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|
203 continue; |
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|
204 } else if (Character.isWhitespace(ch)) { |
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|
205 if (pos != 0) { |
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|
206 parts.add(new String(buffer, 0, pos)); |
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|
207 pos = 0; |
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|
208 } |
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|
209 continue; |
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|
210 |
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|
211 } |
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|
212 } |
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|
213 } |
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|
214 } |
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|
215 buffer[pos++] = ch; |
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|
216 } |
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|
217 |
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|
218 if (insideQuotes) { |
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|
219 throw new IllegalArgumentException("unclosed quotes"); |
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|
220 } |
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|
221 if (escapedChar) { |
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|
222 throw new IllegalArgumentException("command line cannot end with escape char '\\'"); |
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|
223 } |
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224 if (pos != 0) { |
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changeset
|
225 parts.add(new String(buffer, 0, pos)); |
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|
226 } |
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|
227 return parts.toArray(new String[parts.size()]); |
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|
228 } |
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229 |
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|
230 public static String truncate(String s, int maxLength) { |
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|
231 if (maxLength < 0) { |
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|
232 throw new IllegalArgumentException(); |
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|
233 } |
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diff
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|
234 if (s.length() <= maxLength) { |
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|
235 return s; |
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|
236 } |
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|
237 return s.substring(0, maxLength) + "..."; |
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|
238 } |
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|
239 |
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|
240 /** |
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|
241 * Capitalizes the first character in a given string. |
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|
242 * |
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|
243 * @param string the string to process |
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|
244 * @param lowercaseTail if true, the remaining characters in {@code string} are converted to lower case |
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parents:
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|
245 */ |
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diff
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|
246 public static String capitalizeFirst(String string, boolean lowercaseTail) { |
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|
247 final String tail = string.substring(1); |
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|
248 return Character.toUpperCase(string.charAt(0)) + (lowercaseTail ? tail.toLowerCase() : tail); |
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|
249 } |
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|
250 |
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parents:
diff
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|
251 /** |
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|
252 * Chops the last {@code count} from a given string. |
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253 * |
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254 * @param s the string to chop |
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255 * @param count the number of characters to chop from the end of {@code s} |
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256 * @return the chopped string |
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257 * @throws IndexOutOfBoundsException if {@code count < 0} or {@code count > s.length()} |
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258 */ |
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259 public static String chopSuffix(String s, int count) { |
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260 return s.substring(0, s.length() - count); |
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261 } |
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262 |
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263 /** |
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264 * Chops the last {@code suffix.length()} from a given string. Calling this method is |
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265 * equivalent to {@link #chopSuffix(String, int) chop(s, suffix.length())}. |
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266 */ |
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267 public static String chopSuffix(String s, String suffix) { |
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268 return chopSuffix(s, suffix.length()); |
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269 } |
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270 |
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271 /** |
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272 * Prepends {@code n} space characters to every line in String {@code lines}, |
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273 * including a possibly non-empty line following the final newline. |
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274 * Returns {@code lines} if {@code spaces <= 0} |
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275 */ |
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276 public static String indent(String lines, int spaces) { |
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277 return indent(lines, spaces(spaces)); |
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278 } |
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279 |
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280 /** |
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281 * Prepends the String {@code indentation} to every line in String {@code lines}, |
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282 * including a possibly non-empty line following the final newline. |
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283 */ |
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284 public static String indent(String lines, String indentation) { |
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285 if (lines.length() == 0) { |
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286 return lines; |
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287 } |
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288 final String newLine = "\n"; |
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289 if (lines.endsWith(newLine)) { |
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290 return indentation + (lines.substring(0, lines.length() - 1)).replace(newLine, newLine + indentation) + newLine; |
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291 } |
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292 return indentation + lines.replace(newLine, newLine + indentation); |
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293 } |
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294 |
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295 public static String formatParagraphs(String s, int leftJust, int pindent, int width) { |
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296 final int len = s.length(); |
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297 int indent = pindent; |
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298 indent += leftJust; |
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299 int consumed = indent + leftJust; |
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300 final String indstr = space(indent); |
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301 final String ljstr = space(leftJust); |
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302 final StringBuffer buf = new StringBuffer(s.length() + 50); |
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303 buf.append(indstr); |
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304 int lastSp = -1; |
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305 for (int cntr = 0; cntr < len; cntr++) { |
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306 final char c = s.charAt(cntr); |
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307 if (c == '\n') { |
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308 buf.append('\n'); |
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309 consumed = indent; |
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310 buf.append(indstr); |
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311 continue; |
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312 } else if (Character.isWhitespace(c)) { |
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313 lastSp = buf.length(); |
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314 } |
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315 buf.append(c); |
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316 consumed++; |
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317 |
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318 if (consumed > width) { |
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319 if (lastSp >= 0) { |
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320 buf.setCharAt(lastSp, '\n'); |
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321 buf.insert(lastSp + 1, ljstr); |
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322 consumed = buf.length() - lastSp + leftJust - 1; |
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323 } |
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324 } |
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325 } |
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326 return buf.toString(); |
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|
327 } |
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328 |
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329 protected static final String[] spacers = { |
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330 "", // 0 |
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331 " ", // 1 |
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332 " ", // 2 |
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|
333 " ", // 3 |
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|
334 " ", // 4 |
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|
335 " ", // 5 |
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|
336 " ", // 6 |
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337 " ", // 7 |
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338 " ", // 8 |
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339 " ", // 9 |
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340 " ", // 10 |
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|
341 }; |
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342 |
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343 public static void appendFract(StringBuffer buf, double val, int digits) { |
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344 int cntr = 0; |
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345 for (int radix = 10; cntr < digits; radix = radix * 10, cntr++) { |
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346 if (cntr == 0) { |
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347 buf.append('.'); |
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348 } |
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349 final int digit = (int) (val * radix) % 10; |
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350 buf.append((char) (digit + '0')); |
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|
351 } |
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|
352 } |
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|
353 |
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|
354 public static String fixedDouble(double fval, int places) { |
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355 if (Double.isInfinite(fval)) { |
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|
356 return "(inf)"; |
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|
357 } |
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|
358 if (Double.isNaN(fval)) { |
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|
359 return "(NaN)"; |
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|
360 } |
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|
361 |
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|
362 final StringBuffer buf = new StringBuffer(places + 5); |
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|
363 // append the whole part |
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|
364 final long val = (long) fval; |
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|
365 buf.append(val); |
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|
366 // append the fractional part |
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|
367 final double fract = fval >= 0 ? fval - val : val - fval; |
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|
368 appendFract(buf, fract, places); |
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|
369 |
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|
370 return buf.toString(); |
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parents:
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|
371 } |
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|
372 |
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|
373 public static String space(int len) { |
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|
374 if (len <= 0) { |
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|
375 return ""; |
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parents:
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|
376 } |
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|
377 if (len < spacers.length) { |
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|
378 return spacers[len]; |
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|
379 } |
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parents:
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|
380 return times(' ', len); |
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381 } |
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382 |
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383 public static void space(StringBuffer buf, int len) { |
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384 int i = 0; |
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385 while (i++ < len) { |
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386 buf.append(' '); |
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387 } |
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388 } |
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389 |
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390 public static String concat(String first, String second, String separator) { |
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391 if (!first.isEmpty()) { |
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392 return first + separator + second; |
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393 } |
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394 return second; |
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395 } |
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396 |
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397 } |