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