1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.gui.help;
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3 |
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4 | import java.awt.Component;
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5 | import java.util.Locale;
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6 |
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7 | import javax.swing.AbstractButton;
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8 | import javax.swing.Action;
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9 | import javax.swing.JComponent;
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10 | import javax.swing.JMenu;
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11 | import javax.swing.KeyStroke;
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12 |
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13 | import org.openstreetmap.josm.Main;
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14 | import org.openstreetmap.josm.actions.HelpAction;
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15 | import org.openstreetmap.josm.tools.LanguageInfo;
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16 | import org.openstreetmap.josm.tools.LanguageInfo.LocaleType;
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17 |
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18 | /**
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19 | * Provides utility methods for help system.
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20 | * @since 2252
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21 | */
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22 | public final class HelpUtil {
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23 |
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24 | private HelpUtil() {
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25 | // Hide default constructor for utils classes
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26 | }
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27 |
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28 | /**
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29 | * Replies the base wiki URL.
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30 | *
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31 | * @return the base wiki URL
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32 | */
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33 | public static String getWikiBaseUrl() {
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34 | return Main.pref.get("help.baseurl", Main.getJOSMWebsite());
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35 | }
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36 |
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37 | /**
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38 | * Replies the base wiki URL for help pages
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39 | *
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40 | * @return the base wiki URL for help pages
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41 | */
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42 | public static String getWikiBaseHelpUrl() {
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43 | return getWikiBaseUrl() + "/wiki";
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44 | }
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45 |
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46 | /**
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47 | * Replies the URL on the wiki for an absolute help topic. The URL is encoded in UTF-8.
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48 | *
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49 | * @param absoluteHelpTopic the absolute help topic
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50 | * @return the url
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51 | * @see #buildAbsoluteHelpTopic
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52 | */
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53 | public static String getHelpTopicUrl(String absoluteHelpTopic) {
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54 | if (absoluteHelpTopic == null)
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55 | return null;
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56 | String ret = getWikiBaseHelpUrl();
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57 | ret = ret.replaceAll("\\/+$", "");
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58 | absoluteHelpTopic = absoluteHelpTopic.replace(" ", "%20");
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59 | absoluteHelpTopic = absoluteHelpTopic.replaceAll("^\\/+", "/");
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60 | return ret + absoluteHelpTopic;
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61 | }
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62 |
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63 | /**
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64 | * Replies the URL to the edit page for the absolute help topic.
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65 | *
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66 | * @param absoluteHelpTopic the absolute help topic
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67 | * @return the URL to the edit page
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68 | */
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69 | public static String getHelpTopicEditUrl(String absoluteHelpTopic) {
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70 | String topicUrl = getHelpTopicUrl(absoluteHelpTopic);
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71 | topicUrl = topicUrl.replaceAll("#[^#]*$", ""); // remove optional fragment
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72 | return topicUrl + "?action=edit";
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73 | }
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74 |
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75 | /**
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76 | * Extracts the relative help topic from an URL. Replies null, if
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77 | * no relative help topic is found.
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78 | *
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79 | * @param url the url
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80 | * @return the relative help topic in the URL, i.e. "/Action/New"
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81 | */
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82 | public static String extractRelativeHelpTopic(String url) {
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83 | String topic = extractAbsoluteHelpTopic(url);
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84 | if (topic == null)
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85 | return null;
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86 | String pattern = "/[A-Z][a-z]{1,2}(_[A-Z]{2})?:" + getHelpTopicPrefix(LocaleType.ENGLISH).replaceAll("^\\/+", "");
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87 | if (url.matches(pattern)) {
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88 | return topic.substring(pattern.length());
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89 | }
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90 | return null;
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91 | }
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92 |
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93 | /**
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94 | * Extracts the absolute help topic from an URL. Replies null, if
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95 | * no absolute help topic is found.
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96 | *
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97 | * @param url the url
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98 | * @return the absolute help topic in the URL, i.e. "/De:Help/Action/New"
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99 | */
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100 | public static String extractAbsoluteHelpTopic(String url) {
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101 | if (url == null || !url.startsWith(getWikiBaseHelpUrl())) return null;
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102 | url = url.substring(getWikiBaseHelpUrl().length());
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103 | String prefix = getHelpTopicPrefix(LocaleType.ENGLISH);
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104 | if (url.startsWith(prefix))
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105 | return url;
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106 |
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107 | String pattern = "/[A-Z][a-z]{1,2}(_[A-Z]{2})?:" + prefix.replaceAll("^\\/+", "");
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108 | if (url.matches(pattern))
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109 | return url;
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110 |
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111 | return null;
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112 | }
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113 |
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114 | /**
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115 | * Replies the help topic prefix for the given locale. Examples:
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116 | * <ul>
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117 | * <li>/Help if the locale is a locale with language "en"</li>
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118 | * <li>/De:Help if the locale is a locale with language "de"</li>
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119 | * </ul>
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120 | *
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121 | * @param type the type of the locale to use
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122 | * @return the help topic prefix
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123 | * @since 5915
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124 | */
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125 | private static String getHelpTopicPrefix(LocaleType type) {
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126 | String ret = LanguageInfo.getWikiLanguagePrefix(type);
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127 | if (ret == null)
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128 | return ret;
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129 | ret = "/" + ret + Main.pref.get("help.pathhelp", "/Help").replaceAll("^\\/+", ""); // remove leading /
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130 | return ret.replaceAll("\\/+", "\\/"); // collapse sequences of //
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131 | }
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132 |
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133 | /**
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134 | * Replies the absolute, localized help topic for the given topic.
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135 | *
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136 | * Example: for a topic "/Dialog/RelationEditor" and the locale "de", this method
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137 | * replies "/De:Help/Dialog/RelationEditor"
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138 | *
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139 | * @param topic the relative help topic. Home help topic assumed, if null.
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140 | * @param type the locale. {@link Locale#ENGLISH} assumed, if null.
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141 | * @return the absolute, localized help topic
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142 | * @since 5915
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143 | */
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144 | public static String buildAbsoluteHelpTopic(String topic, LocaleType type) {
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145 | String prefix = getHelpTopicPrefix(type);
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146 | if (prefix == null || topic == null || topic.trim().isEmpty() || "/".equals(topic.trim()))
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147 | return prefix;
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148 | prefix += "/" + topic;
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149 | return prefix.replaceAll("\\/+", "\\/"); // collapse sequences of //
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150 | }
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151 |
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152 | /**
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153 | * Replies the context specific help topic configured for <code>context</code>.
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154 | * @param context The UI object used as context
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155 | *
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156 | * @return the help topic. null, if no context specific help topic is found
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157 | */
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158 | public static String getContextSpecificHelpTopic(Object context) {
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159 | if (context == null)
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160 | return null;
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161 | if (context instanceof Helpful)
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162 | return ((Helpful) context).helpTopic();
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163 | if (context instanceof JMenu) {
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164 | JMenu b = (JMenu) context;
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165 | if (b.getClientProperty("help") != null)
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166 | return (String) b.getClientProperty("help");
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167 | return null;
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168 | }
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169 | if (context instanceof AbstractButton) {
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170 | AbstractButton b = (AbstractButton) context;
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171 | if (b.getClientProperty("help") != null)
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172 | return (String) b.getClientProperty("help");
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173 | return getContextSpecificHelpTopic(b.getAction());
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174 | }
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175 | if (context instanceof Action)
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176 | return (String) ((Action) context).getValue("help");
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177 | if (context instanceof JComponent && ((JComponent) context).getClientProperty("help") != null)
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178 | return (String) ((JComponent) context).getClientProperty("help");
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179 | if (context instanceof Component)
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180 | return getContextSpecificHelpTopic(((Component) context).getParent());
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181 | return null;
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182 | }
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183 |
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184 | /**
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185 | * Replies the global help action, if available. Otherwise, creates an instance
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186 | * of {@link HelpAction}.
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187 | *
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188 | * @return instance of help action
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189 | */
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190 | private static Action getHelpAction() {
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191 | if (Main.main != null && Main.main.menu != null) {
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192 | return Main.main.menu.help;
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193 | }
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194 | return new HelpAction();
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195 | }
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196 |
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197 | /**
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198 | * Makes a component aware of context sensitive help.
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199 | *
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200 | * A relative help topic doesn't start with /Help and doesn't include a locale
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201 | * code. Example: /Dialog/RelationEditor is a relative help topic, /De:Help/Dialog/RelationEditor
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202 | * is not.
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203 | *
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204 | * @param component the component
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205 | * @param relativeHelpTopic the help topic. Set to the default help topic if null.
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206 | */
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207 | public static void setHelpContext(JComponent component, String relativeHelpTopic) {
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208 | component.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke("F1"), "help");
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209 | component.getActionMap().put("help", getHelpAction());
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210 | component.putClientProperty("help", relativeHelpTopic == null ? "/" : relativeHelpTopic);
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211 | }
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212 |
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213 | /**
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214 | * This is a simple marker method for help topic literals. If you declare a help
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215 | * topic literal in the source you should enclose it in ht(...).
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216 | *
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217 | * <strong>Example</strong>
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218 | * <pre>
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219 | * String helpTopic = ht("/Dialog/RelationEditor");
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220 | * or
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221 | * putValue("help", ht("/Dialog/RelationEditor"));
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222 | * </pre>
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223 | *
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224 | * @param helpTopic Help topic to mark
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225 | * @return {@code helpTopic}
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226 | */
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227 | public static String ht(String helpTopic) {
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228 | // this is just a marker method
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229 | return helpTopic;
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230 | }
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231 | }
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