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1 /* |
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2 * Copyright (c) 2005 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of the License "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: Parser "base" class. |
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15 * |
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16 */ |
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17 |
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18 |
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19 #include <TInternetDate.h> |
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20 |
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21 #include "FeedParser.h" |
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22 #include "FeedParserObserver.h" |
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23 #include "LeakTracker.h" |
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24 #include "XmlUtils.h" |
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25 |
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26 |
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27 _LIT8(KUrlStr, "url"); |
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28 |
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29 // ----------------------------------------------------------------------------- |
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30 // CFeedParser::CFeedParser |
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31 // C++ default constructor can NOT contain any code, that |
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32 // might leave. |
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33 // ----------------------------------------------------------------------------- |
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34 // |
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35 CFeedParser::CFeedParser(CXmlUtils& aXmlUtils): |
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36 iFeedMappings(3), iItemMappings(3), iXmlUtils(aXmlUtils) |
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37 { |
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38 } |
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39 |
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40 |
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41 // ----------------------------------------------------------------------------- |
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42 // CFeedParser::~CFeedParser |
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43 // Deconstructor. |
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44 // ----------------------------------------------------------------------------- |
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45 // |
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46 CFeedParser::~CFeedParser() |
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47 { |
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48 iFeedMappings.Close(); |
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49 iItemMappings.Close(); |
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50 } |
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51 |
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52 |
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53 // ----------------------------------------------------------------------------- |
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54 // CFeedParser::AddFeedMappingL |
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55 // |
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56 // Add a feed ElementHandler mapping. See AddMappingL. |
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57 // ----------------------------------------------------------------------------- |
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58 // |
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59 void CFeedParser::AddFeedMappingL(const TDesC8& aNamespace, const TDesC8& aElementName, |
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60 TInt aValueId, ElementHandlerFunctionL aHandler) |
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61 { |
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62 AddMappingL(iFeedMappings, aNamespace, aElementName, aValueId, aHandler); |
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63 } |
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64 |
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65 |
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66 // ----------------------------------------------------------------------------- |
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67 // CFeedParser::HandleFeedChildL |
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68 // |
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69 // Process a child of a feed element. See HandleChildL |
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70 // ----------------------------------------------------------------------------- |
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71 // |
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72 void CFeedParser::HandleFeedChildL(TXmlEngElement aNode, |
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73 MFeedParserObserver& aObserver) const |
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74 { |
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75 HandleChildL(iFeedMappings, aNode, aObserver); |
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76 } |
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77 |
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78 |
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79 // ----------------------------------------------------------------------------- |
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80 // CFeedParser::AddItemMappingL |
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81 // |
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82 // Add an item ElementHandler mapping. See AddMappingL. |
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83 // ----------------------------------------------------------------------------- |
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84 // |
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85 void CFeedParser::AddItemMappingL(const TDesC8& aNamespace, const TDesC8& aElementName, |
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86 TInt aValueId, ElementHandlerFunctionL aHandler) |
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87 { |
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88 AddMappingL(iItemMappings, aNamespace, aElementName, aValueId, aHandler); |
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89 } |
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90 |
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91 |
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92 // ----------------------------------------------------------------------------- |
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93 // CFeedParser::HandleItemChildL |
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94 // |
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95 // Process a child of a item element. See HandleChildL |
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96 // ----------------------------------------------------------------------------- |
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97 // |
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98 void CFeedParser::HandleItemChildL(TXmlEngElement aNode, |
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99 MFeedParserObserver& aObserver) const |
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100 { |
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101 HandleChildL(iItemMappings, aNode, aObserver); |
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102 } |
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103 |
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104 |
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105 // ----------------------------------------------------------------------------- |
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106 // CFeedParser::ElementHandlerCDataL |
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107 // |
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108 // An ElementHandler function that extracts the value from the |
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109 // child text nodes. |
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110 // ----------------------------------------------------------------------------- |
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111 // |
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112 void CFeedParser::ElementHandlerCDataL(const CFeedParser& /*aParser*/, CXmlUtils& aXmlUtils, |
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113 TXmlEngElement aNode, TInt aValueId, MFeedParserObserver& aObserver) |
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114 { |
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115 TDesC* ucs2Des = NULL; |
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116 |
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117 // Get the text. |
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118 ucs2Des = aXmlUtils.ExtractTextL(aNode); |
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119 if ((ucs2Des == NULL) || (ucs2Des->Length() == 0)) |
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120 { |
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121 delete ucs2Des; |
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122 return; |
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123 } |
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124 |
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125 // Set the value |
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126 CleanupStack::PushL(ucs2Des); |
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127 aObserver.AddAttributeL(aValueId, *ucs2Des); |
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128 CleanupStack::PopAndDestroy(ucs2Des); |
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129 } |
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130 |
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131 |
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132 // ----------------------------------------------------------------------------- |
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133 // CFeedParser::ElementHandlerTextL |
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134 // |
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135 // An ElementHandler function that extracts the value from the |
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136 // child text nodes then resolves any html entities and removes any markup. |
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137 // ----------------------------------------------------------------------------- |
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138 // |
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139 void CFeedParser::ElementHandlerTextL(const CFeedParser& /*aParser*/, CXmlUtils& aXmlUtils, |
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140 TXmlEngElement aNode, TInt aValueId, MFeedParserObserver& aObserver) |
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141 { |
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142 HBufC* ucs2Des = NULL; |
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143 |
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144 // Get the text. |
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145 ucs2Des = aXmlUtils.ExtractTextL(aNode); |
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146 if ((ucs2Des == NULL) || (ucs2Des->Length() == 0)) |
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147 { |
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148 delete ucs2Des; |
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149 return; |
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150 } |
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151 |
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152 // Clean it up. |
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153 TPtr ptr(ucs2Des->Des()); |
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154 |
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155 CleanupStack::PushL(ucs2Des); |
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156 (void) aXmlUtils.CleanupMarkupL(ptr, 0); |
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157 |
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158 // Set the value |
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159 if (ucs2Des->Length() > 0) |
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160 { |
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161 aObserver.AddAttributeL(aValueId, *ucs2Des); |
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162 } |
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163 |
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164 CleanupStack::PopAndDestroy(ucs2Des); |
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165 } |
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166 |
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167 |
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168 // ----------------------------------------------------------------------------- |
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169 // CFeedParser::ElementHandlerUrlChildL |
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170 // |
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171 // An ElementHandler function that extracts the value from a child |
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172 // url element. If the element doesn't contain any elements and it contains |
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173 // text it is extracted instead. |
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174 // ----------------------------------------------------------------------------- |
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175 // |
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176 void CFeedParser::ElementHandlerUrlChildL(const CFeedParser& aParser, CXmlUtils& aXmlUtils, |
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177 TXmlEngElement aNode, TInt aValueId, MFeedParserObserver& aObserver) |
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178 { |
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179 TXmlEngElement urlNode = NULL; |
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180 |
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181 // Get the url element. |
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182 urlNode = aXmlUtils.GetFirstNamedChild(aNode, KUrlStr()); |
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183 |
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184 // If it doesn't have a url child and it has no children at all just |
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185 // extract the url from the node's text. |
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186 if ((urlNode.IsNull()) && (!urlNode.HasChildNodes())) |
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187 { |
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188 urlNode = aNode; |
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189 } |
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190 |
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191 // Extracts the value url. |
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192 ElementHandlerUrlL(aParser, aXmlUtils, urlNode, aValueId, aObserver); |
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193 } |
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194 |
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195 |
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196 // ----------------------------------------------------------------------------- |
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197 // CFeedParser::ElementHandlerUrlL |
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198 // |
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199 // An ElementHandler function that extracts the value from the |
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200 // child text nodes. It further performs url related clean up. |
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201 // ----------------------------------------------------------------------------- |
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202 // |
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203 void CFeedParser::ElementHandlerUrlL(const CFeedParser& /*aParser*/, CXmlUtils& aXmlUtils, |
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204 TXmlEngElement aNode, TInt aValueId, MFeedParserObserver& aObserver) |
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205 { |
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206 TDesC* ucs2Des = NULL; |
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207 |
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208 // Get the text. |
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209 ucs2Des = aXmlUtils.ExtractTextL(aNode); |
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210 if ((ucs2Des == NULL) || (ucs2Des->Length() == 0)) |
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211 { |
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212 delete ucs2Des; |
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213 return; |
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214 } |
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215 |
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216 CleanupStack::PushL(ucs2Des); |
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217 |
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218 // Clean up the url. |
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219 TPtr ptr(const_cast<TUint16*>(ucs2Des->Ptr()), ucs2Des->Length()); |
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220 aXmlUtils.CleanupUrlL(ptr); |
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221 |
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222 // TODO: Resolve the href using feed url (the feed's url can be stored in CFeedParser). |
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223 |
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224 // Set the value |
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225 aObserver.AddAttributeL(aValueId, *ucs2Des); |
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226 CleanupStack::PopAndDestroy(ucs2Des); |
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227 } |
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228 |
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229 |
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230 // ----------------------------------------------------------------------------- |
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231 // CFeedParser::ElementHandlerDateL |
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232 // |
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233 // An ElementHandler function that extracts the date from the |
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234 // child text nodes. It can handle date formats defined in RFC 3339, RFC 822, |
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235 // RFC 1123, RFC 850, and RFC 1036 |
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236 // ----------------------------------------------------------------------------- |
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237 // |
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238 void CFeedParser::ElementHandlerDateL(const CFeedParser& /*aParser*/, |
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239 CXmlUtils& /*aXmlUtils*/, TXmlEngElement aNode, TInt aValueId, MFeedParserObserver& aObserver) |
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240 { |
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241 TTime date; |
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242 TBool dateSet = EFalse; |
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243 RBuf8 rbuf; |
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244 |
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245 // Get the text. |
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246 aNode.WholeTextContentsCopyL( rbuf ); |
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247 if ( rbuf.Length() == 0 ) |
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248 { |
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249 rbuf.Close(); |
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250 return; |
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251 } |
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252 rbuf.CleanupClosePushL(); |
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253 |
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254 // Try to handle the date with TInternetDate first. |
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255 TInternetDate internetData; |
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256 |
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257 TRAPD(err, internetData.SetDateL( rbuf )); |
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258 if (err == KErrNone) |
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259 { |
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260 date = internetData.DateTime(); |
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261 dateSet = ETrue; |
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262 } |
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263 |
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264 // Otherwise if that didn't work then try to interpret it as a RFC 3339 date. |
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265 else if (err == KErrCorrupt) |
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266 { |
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267 TRAP(err, ParseRFC3339L( rbuf, date )); |
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268 if (err == KErrNone) |
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269 { |
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270 dateSet = ETrue; |
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271 } |
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272 } |
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273 |
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274 // Set the value |
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275 if (dateSet) |
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276 { |
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277 TBuf16<25> str; |
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278 |
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279 str.Format(_L("%Ld"), date.Int64()); |
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280 aObserver.AddAttributeL(aValueId, str); |
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281 } |
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282 |
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283 CleanupStack::PopAndDestroy( /*rbuf*/ ); |
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284 } |
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285 |
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286 |
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287 // ----------------------------------------------------------------------------- |
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288 // CFeedParser::AddMappingL |
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289 // |
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290 // Makes a mapping between an element's namespance and name with the normalized |
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291 // value-id (i.e. title or description) and a function which extracts out |
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292 // relevant data and applies it to a provided ValueHolder using the value-id |
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293 // (see HandleChildL). |
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294 // ----------------------------------------------------------------------------- |
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295 // |
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296 void CFeedParser::AddMappingL(RArray<ElementHandlerMapEntry>& aMappings, |
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297 const TDesC8& aNamespace, const TDesC8& aElementName, TInt aValueId, |
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298 ElementHandlerFunctionL aHandler) |
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299 { |
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300 ElementHandlerMapEntry entry; |
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301 |
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302 // Init the entry. |
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303 entry.iElementNamespace.Set(aNamespace); |
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304 entry.iElementName.Set(aElementName); |
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305 entry.iValueId = aValueId; |
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306 entry.iElementHandlerL = aHandler; |
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307 |
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308 // Append the entry. |
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309 User::LeaveIfError(aMappings.Append(entry)); |
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310 } |
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311 |
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312 |
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313 // ----------------------------------------------------------------------------- |
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314 // CFeedParser::HandleChildL |
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315 // |
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316 // Using the mapping defined by calls to AddMappingL it passes aNode, |
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317 // aValueHolder and associated value-id to the associated function. The method |
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318 // does what is needed to extract the relevant values from the node and applies |
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319 // them on aValueHolder (using the normalized value-id). |
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320 // ----------------------------------------------------------------------------- |
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321 // |
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322 void CFeedParser::HandleChildL(const RArray<ElementHandlerMapEntry>& aMappings, |
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323 TXmlEngElement aNode, MFeedParserObserver& aObserver) const |
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324 { |
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325 // Find the corresponding entry in the map. |
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326 for (TInt i = 0; i < aMappings.Count(); i++) |
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327 { |
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328 // Call the ElementHandler. |
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329 if (iXmlUtils.IsNamed(aNode, aMappings[i].iElementNamespace, |
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330 aMappings[i].iElementName)) |
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331 { |
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332 (aMappings[i].iElementHandlerL)(*this, iXmlUtils, aNode, |
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333 aMappings[i].iValueId, aObserver); |
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334 break; |
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335 } |
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336 } |
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337 } |
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338 |
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339 |
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340 // ----------------------------------------------------------------------------- |
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341 // CFeedParser::RFC3339DateL |
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342 // |
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343 // Converts the given RFC 3339 date into a TTime. |
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344 // RFC 3339 format (examples): YYYY-MM-DDTHH:MM:SS.FFZ, |
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345 // YYYY-MM-DDTHH:MM:SS.FF+HH:MM or YYYY-MM-DDTHH:MM:SS.FF-HH:MM |
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346 // ----------------------------------------------------------------------------- |
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347 // |
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348 void CFeedParser::ParseRFC3339L(const TDesC8& aDateStr, TTime& aDate) |
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349 { |
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350 enum TPart {EYear, EMonth, EDay, EHour, EMin, ESec, EMicro, EZoneHour, EZoneMin, ENone}; |
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351 |
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352 TDateTime dateTime; |
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353 TInt num; |
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354 TBuf<30> timeStr; |
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355 TBuf<30> zoneHour; |
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356 TBuf<30> zoneMin; |
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357 TPart part = EYear; |
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358 TInt zone = 0; |
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359 |
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360 timeStr.Zero(); |
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361 |
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362 if (aDateStr.Length() > 30) |
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363 { |
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364 User::Leave(KErrCorrupt); |
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365 } |
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366 |
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367 for (TInt i = 0; i < aDateStr.Length(); i++) |
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368 { |
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369 TChar c(aDateStr[i]); |
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370 |
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371 // Extract the year. |
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372 if (part == EYear) |
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373 { |
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374 if (c.IsDigit()) |
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375 { |
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376 timeStr.Append(c); |
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377 } |
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378 else if (c == '-') |
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379 { |
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380 // If timeStr.Length() equals 2 then get the current |
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381 // year and use the first two digits to set the four digit year. |
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382 if (timeStr.Length() == 2) |
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383 { |
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384 TTime now; |
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385 TInt year; |
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386 TBuf<4> yearStr; |
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387 |
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388 now.UniversalTime(); |
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389 year = now.DateTime().Year(); |
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390 yearStr.AppendNum(year); |
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391 |
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392 timeStr.Insert(0, yearStr.Left(1)); |
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393 timeStr.Insert(1, yearStr.Mid(1, 1)); |
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394 } |
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395 |
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396 TLex16 lex(timeStr); |
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397 |
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398 lex.Val(num); |
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399 User::LeaveIfError(dateTime.SetYear(num)); |
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400 timeStr.Zero(); |
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401 |
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402 part = EMonth; |
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403 } |
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404 else |
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405 { |
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406 User::Leave(KErrCorrupt); |
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407 } |
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408 } |
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409 |
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410 // Extract the month. |
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411 else if (part == EMonth) |
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412 { |
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413 if (c.IsDigit()) |
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414 { |
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415 timeStr.Append(c); |
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416 } |
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417 else if (c == '-') |
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418 { |
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419 TLex16 lex(timeStr); |
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420 TMonth month = EJanuary; |
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421 |
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422 lex.Val(num); |
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423 |
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424 // Convert num to the month enum. |
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425 switch (num) |
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426 { |
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427 case 1: |
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428 month = EJanuary; |
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429 break; |
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430 case 2: |
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431 month = EFebruary; |
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432 break; |
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433 case 3: |
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434 month = EMarch; |
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435 break; |
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436 case 4: |
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437 month = EApril; |
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438 break; |
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439 case 5: |
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440 month = EMay; |
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441 break; |
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442 case 6: |
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443 month = EJune; |
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444 break; |
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445 case 7: |
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446 month = EJuly; |
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447 break; |
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448 case 8: |
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449 month = EAugust; |
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450 break; |
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451 case 9: |
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452 month = ESeptember; |
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453 break; |
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454 case 10: |
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455 month = EOctober; |
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456 break; |
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457 case 11: |
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458 month = ENovember; |
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459 break; |
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460 case 12: |
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461 month = EDecember; |
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462 break; |
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463 default: |
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464 User::Leave(KErrCorrupt); |
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465 break; |
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466 } |
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467 |
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468 User::LeaveIfError(dateTime.SetMonth(month)); |
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469 timeStr.Zero(); |
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470 |
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471 part = EDay; |
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472 } |
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473 else |
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474 { |
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475 User::Leave(KErrCorrupt); |
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476 } |
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477 } |
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478 |
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479 // Extract the day. |
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480 else if (part == EDay) |
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481 { |
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482 if (c.IsDigit()) |
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483 { |
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484 timeStr.Append(c); |
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485 } |
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486 else if ((c == 'T') || (c == 't')) |
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487 { |
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488 TLex16 lex(timeStr); |
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489 |
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490 lex.Val(num); |
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491 // Day is zero based for some odd reason... |
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492 User::LeaveIfError(dateTime.SetDay(num - 1)); |
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493 timeStr.Zero(); |
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494 |
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495 part = EHour; |
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496 } |
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497 else |
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498 { |
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499 User::Leave(KErrCorrupt); |
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500 } |
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501 } |
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502 |
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503 // Extract the hour. |
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504 else if (part == EHour) |
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505 { |
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506 if (c.IsDigit()) |
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507 { |
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508 timeStr.Append(c); |
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509 } |
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510 else if (c == ':') |
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511 { |
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512 TLex16 lex(timeStr); |
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513 |
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514 lex.Val(num); |
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515 User::LeaveIfError(dateTime.SetHour(num)); |
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516 timeStr.Zero(); |
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517 |
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518 part = EMin; |
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519 } |
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520 else |
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521 { |
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522 User::Leave(KErrCorrupt); |
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523 } |
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524 } |
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525 |
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526 // Extract the min. |
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527 else if (part == EMin) |
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528 { |
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529 if (c.IsDigit()) |
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530 { |
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531 timeStr.Append(c); |
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532 } |
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533 else if (c == ':') |
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534 { |
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535 TLex16 lex(timeStr); |
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536 |
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537 lex.Val(num); |
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538 User::LeaveIfError(dateTime.SetMinute(num)); |
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539 timeStr.Zero(); |
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540 |
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541 part = ESec; |
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542 } |
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543 else |
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544 { |
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545 User::Leave(KErrCorrupt); |
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546 } |
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547 } |
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548 |
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549 |
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550 // Extract the sec. |
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551 else if (part == ESec) |
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552 { |
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553 if (c.IsDigit()) |
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554 { |
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555 timeStr.Append(c); |
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556 } |
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557 else if (c == '.') |
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558 { |
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559 TLex16 lex(timeStr); |
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560 |
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561 lex.Val(num); |
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562 User::LeaveIfError(dateTime.SetSecond(num)); |
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563 timeStr.Zero(); |
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564 |
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565 part = EMicro; |
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566 } |
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567 else if ((c == 'Z') || (c == 'z')) |
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568 { |
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569 TLex16 lex(timeStr); |
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570 |
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571 lex.Val(num); |
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572 User::LeaveIfError(dateTime.SetSecond(num)); |
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573 timeStr.Zero(); |
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574 |
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575 zone = 0; |
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576 part = ENone; |
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577 } |
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578 else if (c == '+') |
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579 { |
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580 TLex16 lex(timeStr); |
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581 |
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582 lex.Val(num); |
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583 User::LeaveIfError(dateTime.SetSecond(num)); |
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584 timeStr.Zero(); |
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585 |
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586 zone = 1; |
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587 part = EZoneHour; |
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588 } |
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589 else if (c == '-') |
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590 { |
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591 TLex16 lex(timeStr); |
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592 |
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593 lex.Val(num); |
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594 User::LeaveIfError(dateTime.SetSecond(num)); |
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595 timeStr.Zero(); |
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596 |
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597 zone = -1; |
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598 part = EZoneHour; |
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599 } |
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600 else |
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601 { |
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602 User::Leave(KErrCorrupt); |
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603 } |
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604 } |
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605 |
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606 // Ignore the micro-sec. |
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607 else if (part == EMicro) |
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608 { |
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609 if (c.IsDigit()) |
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610 { |
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611 // Ignore microseconds. |
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612 } |
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613 else if ((c == 'Z') || (c == 'z')) |
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614 { |
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615 zone = 0; |
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616 part = ENone; |
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617 } |
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618 else if (c == '+') |
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619 { |
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620 zone = 1; |
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621 part = EZoneHour; |
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622 } |
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623 else if (c == '-') |
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624 { |
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625 zone = -1; |
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626 part = EZoneHour; |
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627 } |
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628 else |
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629 { |
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630 User::Leave(KErrCorrupt); |
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631 } |
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632 } |
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633 |
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634 // Extract the hour. |
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635 else if (part == EZoneHour) |
|
636 { |
|
637 if (c.IsDigit()) |
|
638 { |
|
639 zoneHour.Append(c); |
|
640 } |
|
641 else if (c == ':') |
|
642 { |
|
643 part = EZoneMin; |
|
644 } |
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645 else |
|
646 { |
|
647 User::Leave(KErrCorrupt); |
|
648 } |
|
649 } |
|
650 |
|
651 // Extract the min. |
|
652 else if (part == EZoneMin) |
|
653 { |
|
654 if (c.IsDigit()) |
|
655 { |
|
656 zoneMin.Append(c); |
|
657 } |
|
658 else |
|
659 { |
|
660 User::Leave(KErrCorrupt); |
|
661 } |
|
662 } |
|
663 |
|
664 else |
|
665 { |
|
666 User::Leave(KErrCorrupt); |
|
667 } |
|
668 } |
|
669 |
|
670 // Handle the common date only format (i.e. YYYY-MM-DD). |
|
671 if ((part == EDay) && ((aDateStr.Length() == 10) || (aDateStr.Length() == 8))) |
|
672 { |
|
673 TLex16 lex(timeStr); |
|
674 |
|
675 lex.Val(num); |
|
676 |
|
677 // Day is zero based for some odd reason... |
|
678 User::LeaveIfError(dateTime.SetDay(num - 1)); |
|
679 } |
|
680 |
|
681 // Convert timeStr into a TTime. |
|
682 aDate = dateTime; |
|
683 |
|
684 // Adjust the aDate to UTC. |
|
685 if (zone != 0) |
|
686 { |
|
687 TLex16 zHoursLex(zoneHour); |
|
688 TLex16 zMinLex(zoneMin); |
|
689 TInt zHours; |
|
690 TInt zMins; |
|
691 |
|
692 // Get the offset. |
|
693 zHoursLex.Val(zHours); |
|
694 zMinLex.Val(zMins); |
|
695 |
|
696 // Adjust it back to UTC. |
|
697 if (zone > 0) |
|
698 { |
|
699 aDate -= TTimeIntervalHours(zHours); |
|
700 aDate -= TTimeIntervalMinutes(zMins); |
|
701 } |
|
702 |
|
703 // Otherwise adjust it forward to UTC. |
|
704 else |
|
705 { |
|
706 aDate += TTimeIntervalHours(zHours); |
|
707 aDate += TTimeIntervalMinutes(zMins); |
|
708 } |
|
709 } |
|
710 } |
|
711 |