1 | package de.ugoe.cs.util.console;
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2 |
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3 | import java.util.ArrayList;
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4 | import java.util.List;
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5 |
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6 | /**
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7 | * <p>
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8 | * Helper class to parse command strings and create parameters.
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9 | * </p>
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10 | *
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11 | * @author Steffen Herbold
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12 | * @version 1.0
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13 | */
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14 | public class CommandParser {
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15 |
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16 | /**
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17 | * <p>
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18 | * Name of the command.
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19 | * </p>
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20 | */
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21 | private String commandName;
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22 |
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23 | /**
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24 | * <p>
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25 | * Parameters of the command as a {@link List}. The parameters can either be
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26 | * {@link String} or {@link String} arrays.
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27 | * </p>
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28 | */
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29 | private List<Object> parameters;
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30 |
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31 | /**
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32 | * <p>
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33 | * Creates a new CommandParser.
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34 | * </p>
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35 | */
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36 | public CommandParser() {
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37 | commandName = "";
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38 | parameters = new ArrayList<Object>();
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39 | }
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40 |
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41 | /**
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42 | * <p>
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43 | * Returns the name of the command.
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44 | * </p>
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45 | *
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46 | * @return name of the command
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47 | */
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48 | public String getCommandName() {
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49 | return commandName;
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50 | }
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51 |
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52 | /**
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53 | * <p>
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54 | * Returns the {@link List} of parameters
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55 | * </p>
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56 | *
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57 | * @return
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58 | */
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59 | public List<Object> getParameters() {
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60 | return parameters;
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61 | }
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62 |
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63 | /**
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64 | * <p>
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65 | * Parses a command after the following EBNF (mixed with natural language):
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66 | * </p>
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67 | * <code>
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68 | * <command> :=
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69 | * <commandname><whitespace>{<parameter>}<br>
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70 | * <commandname> := String without whitespaces. Has to be a valid Java
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71 | * class name<br>
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72 | * <parameter> := <string>|<stringarray><br>
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73 | * <string> :=
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74 | * <stringwithoutwhitespaces>|<stringwithwhitespaces>
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75 | * <stringwithoutwhitespaces> := a string without whitespaces<br>
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76 | * <stringwithoutwhitespaces> := a string, that can have whitespaces,
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77 | * but must be in double quotes<br>
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78 | * <stringarray> :=
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79 | * "["<string>{<whitespace><string>"]"
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80 | * </code>
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81 | *
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82 | * @param command
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83 | * the command as a string
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84 | */
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85 | public void parse(String command) {
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86 | if (command == null || command.equals("")) {
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87 | return;
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88 | }
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89 | String[] splitResult = command.split(" ");
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90 | commandName = splitResult[0];
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91 | char[] commandChars = command.substring(commandName.length())
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92 | .toCharArray();
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93 | boolean startParameter = true;
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94 | boolean isArray = false;
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95 | boolean startArrayparameter = false;
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96 | boolean isString = false;
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97 | int bufferPos = 0;
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98 | char[] buffer = new char[1024];
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99 | boolean quote = false;
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100 | List<String> arrayBuffer = null;
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101 | for (int i = 0; i < commandChars.length; i++) {
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102 | if (i < commandChars.length && startParameter
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103 | && commandChars[i] == '[') {
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104 | isArray = true;
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105 | startArrayparameter = true;
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106 | arrayBuffer = new ArrayList<String>();
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107 | startParameter = false;
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108 | i++; // skip [
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109 | }
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110 | if (i < commandChars.length && startParameter
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111 | && commandChars[i] == '\'') {
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112 | isString = true;
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113 | quote = true;
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114 | startParameter = false;
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115 | i++; // skip '
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116 | }
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117 | if (i < commandChars.length && startParameter
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118 | && !Character.isWhitespace(commandChars[i])) {
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119 | isString = true;
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120 | startParameter = false;
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121 | }
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122 | if (isArray) {
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123 | if (i < commandChars.length && commandChars[i] == ']') {
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124 | if (bufferPos > 0) {
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125 | buffer[bufferPos] = '\0';
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126 | arrayBuffer.add((new String(buffer)).trim());
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127 | }
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128 | parameters.add(arrayBuffer.toArray(new String[0]));
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129 | isArray = false;
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130 | isString = false;
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131 | bufferPos = 0;
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132 | buffer = new char[128];
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133 | startArrayparameter = false;
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134 | startParameter = true;
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135 | i++; // skip ]
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136 | }
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137 | if (i < commandChars.length && startArrayparameter
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138 | && !Character.isWhitespace(commandChars[i])) {
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139 | buffer = new char[128];
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140 | bufferPos = 0;
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141 | quote = commandChars[i] == '\'';
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142 | if (quote) {
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143 | i++; // skip '
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144 | }
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145 | startArrayparameter = false;
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146 | }
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147 | if (i < commandChars.length && quote && commandChars[i] == '\'') {
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148 | // end of parameter with '
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149 | i++; // skip '
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150 | startArrayparameter = true;
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151 | buffer[bufferPos] = '\0';
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152 | arrayBuffer.add((new String(buffer)).trim());
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153 | }
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154 | if (i < commandChars.length && !quote
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155 | && Character.isWhitespace(commandChars[i])) {
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156 | startArrayparameter = true;
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157 | buffer[bufferPos] = '\0';
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158 | arrayBuffer.add((new String(buffer)).trim());
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159 | }
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160 | if (i < commandChars.length && !startArrayparameter
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161 | && !startParameter) {
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162 | buffer[bufferPos] = commandChars[i];
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163 | bufferPos++;
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164 | }
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165 | }
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166 | if (isString) {
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167 | if ((quote && commandChars[i] == '\'')
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168 | || (!quote && Character.isWhitespace(commandChars[i]))) {
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169 | // end of parameter with '
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170 | if (quote) {
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171 | i++; // skip '
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172 | }
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173 | if (bufferPos > 0) {
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174 | buffer[bufferPos] = '\0';
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175 | }
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176 | parameters.add((new String(buffer).trim()));
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177 | isArray = false;
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178 | isString = false;
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179 | bufferPos = 0;
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180 | buffer = new char[128];
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181 | startArrayparameter = false;
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182 | startParameter = true;
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183 | }
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184 | if (!startParameter) {
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185 | buffer[bufferPos] = commandChars[i];
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186 | bufferPos++;
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187 | }
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188 | }
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189 | }
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190 | if (bufferPos > 0) {
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191 | if (isArray) {
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192 | arrayBuffer.add((new String(buffer)).trim());
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193 | parameters.add(arrayBuffer);
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194 | }
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195 | if (isString) {
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196 | parameters.add((new String(buffer)).trim());
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197 | }
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198 | }
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199 | }
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200 | }
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