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1 /* |
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2 * libxml2_xlink.c : implementation of the hyperlinks detection module |
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3 * This version supports both XML XLinks and HTML simple links |
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4 * |
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5 * See Copyright for the status of this software. |
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6 * |
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7 * daniel@veillard.com |
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8 * Portion Copyright © 2009 Nokia Corporation and/or its subsidiary(-ies). All rights reserved. |
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9 */ |
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10 |
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11 #define IN_LIBXML |
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12 #include "xmlenglibxml.h" |
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13 |
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14 #ifdef LIBXML_XPTR_ENABLED |
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15 #include <string.h> /* for memset() only */ |
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16 #ifdef HAVE_CTYPE_H |
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17 #include <ctype.h> |
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18 #endif |
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19 #ifdef HAVE_STDLIB_H |
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20 #include <stdlib.h> |
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21 #endif |
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22 #ifdef HAVE_SYS_STAT_H |
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23 #include <sys/stat.h> |
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24 #endif |
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25 #ifdef HAVE_FCNTL_H |
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26 #include <fcntl.h> |
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27 #endif |
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28 #ifdef HAVE_UNISTD_H |
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29 #include <unistd.h> |
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30 #endif |
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31 #ifdef HAVE_ZLIB_H |
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32 #include <zlib.h> |
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33 #endif |
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34 |
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35 #include <libxml2_xmlmemory.h> |
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36 #include <libxml2_tree.h> |
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37 #include <libxml2_parser.h> |
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38 #include <libxml2_valid.h> |
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39 #include <libxml2_xlink.h> |
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40 #include <libxml2_globals.h> |
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41 |
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42 #define XLINK_NAMESPACE (BAD_CAST "http://www.w3.org/1999/xlink/namespace/") |
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43 #define XHTML_NAMESPACE (BAD_CAST "http://www.w3.org/1999/xhtml/") |
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44 |
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45 /**************************************************************** |
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46 * * |
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47 * Default setting and related functions * |
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48 * * |
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49 ****************************************************************/ |
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50 |
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51 /** |
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52 * xlinkGetDefaultHandler: |
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53 * |
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54 * Get the default xlink handler. |
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55 * |
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56 * Returns the current xlinkHandlerPtr value. |
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57 */ |
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58 xlinkHandlerPtr |
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59 xlinkGetDefaultHandler(void) { |
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60 return(xlinkDefaultHandler); |
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61 } |
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62 |
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63 |
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64 /** |
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65 * xlinkSetDefaultHandler: |
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66 * @param handler the new value for the xlink handler block |
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67 * |
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68 * Set the default xlink handlers |
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69 */ |
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70 void |
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71 xlinkSetDefaultHandler(xlinkHandlerPtr handler) { |
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72 xlinkDefaultHandler = handler; |
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73 } |
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74 |
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75 /** |
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76 * xlinkGetDefaultDetect: |
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77 * |
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78 * Get the default xlink detection routine |
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79 * |
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80 * Returns the current function or NULL; |
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81 */ |
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82 xlinkNodeDetectFunc |
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83 xlinkGetDefaultDetect (void) { |
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84 return(xlinkDefaultDetect); |
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85 } |
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86 |
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87 /** |
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88 * xlinkSetDefaultDetect: |
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89 * @param func pointer to the new detection routine. |
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90 * |
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91 * Set the default xlink detection routine |
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92 */ |
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93 void |
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94 xlinkSetDefaultDetect (xlinkNodeDetectFunc func) { |
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95 xlinkDefaultDetect = func; |
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96 } |
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97 |
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98 /**************************************************************** |
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99 * * |
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100 * The detection routines * |
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101 * * |
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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 * xlinkIsLink: |
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107 * @param doc the document containing the node |
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108 * @param node the node pointer itself |
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109 * |
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110 * Check whether the given node carries the attributes needed |
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111 * to be a link element (or is one of the linking elements issued |
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112 * from the (X)HTML DtDs). |
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113 * This routine don't try to do full checking of the link validity |
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114 * but tries to detect and return the appropriate link type. |
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115 * |
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116 * Returns the xlinkType of the node (XLINK_TYPE_NONE if there is no |
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117 * link detected. |
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118 */ |
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119 xlinkType |
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120 xlinkIsLink (xmlDocPtr doc, xmlNodePtr node) { |
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121 xmlChar *type = NULL, *role = NULL; |
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122 xlinkType ret = XLINK_TYPE_NONE; |
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123 |
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124 if (node == NULL) return(XLINK_TYPE_NONE); |
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125 if (doc == NULL) doc = node->doc; |
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126 if ((doc != NULL) && (doc->type == XML_HTML_DOCUMENT_NODE)) { |
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127 /* |
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128 * This is an HTML document. |
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129 */ |
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130 } else if ((node->ns != NULL) && |
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131 (xmlStrEqual(node->ns->href, XHTML_NAMESPACE))) { |
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132 /* |
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133 * !!!! We really need an IS_XHTML_ELEMENT function from HTMLtree.h @@@ |
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134 */ |
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135 /* |
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136 * This is an XHTML element within an XML document |
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137 * Check whether it's one of the element able to carry links |
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138 * and in that case if it holds the attributes. |
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139 */ |
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140 } |
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141 |
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142 /* |
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143 * We don't prevent a-priori having XML Linking constructs on |
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144 * XHTML elements |
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145 */ |
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146 type = xmlGetNsProp(node, BAD_CAST"type", XLINK_NAMESPACE); |
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147 if (type != NULL) { |
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148 if (xmlStrEqual(type, BAD_CAST "simple")) { |
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149 ret = XLINK_TYPE_SIMPLE; |
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150 } if (xmlStrEqual(type, BAD_CAST "extended")) { |
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151 role = xmlGetNsProp(node, BAD_CAST "role", XLINK_NAMESPACE); |
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152 if (role != NULL) { |
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153 xmlNsPtr xlink; |
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154 xlink = xmlSearchNs(doc, node, XLINK_NAMESPACE); |
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155 if (xlink == NULL) { |
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156 /* Humm, fallback method */ |
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157 if (xmlStrEqual(role, BAD_CAST"xlink:external-linkset")) |
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158 ret = XLINK_TYPE_EXTENDED_SET; |
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159 } else { |
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160 xmlChar buf[200]; |
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161 snprintf((char *) buf, sizeof(buf), "%s:external-linkset", |
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162 (char *) xlink->prefix); |
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163 buf[sizeof(buf) - 1] = 0; |
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164 if (xmlStrEqual(role, buf)) |
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165 ret = XLINK_TYPE_EXTENDED_SET; |
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166 |
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167 } |
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168 |
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169 } |
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170 ret = XLINK_TYPE_EXTENDED; |
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171 } |
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172 } |
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173 |
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174 if (type != NULL) xmlFree(type); |
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175 if (role != NULL) xmlFree(role); |
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176 return(ret); |
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177 } |
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178 #endif /* LIBXML_XPTR_ENABLED */ |