1 | /* |
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2 | * 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 | */ |
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9 | |
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10 | |
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11 | #define IN_LIBXML |
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12 | #include "libxml.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 <libxml/xmlmemory.h> |
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36 | #include <libxml/tree.h> |
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37 | #include <libxml/parser.h> |
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38 | #include <libxml/valid.h> |
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39 | #include <libxml/xlink.h> |
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40 | #include <libxml/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 | static xlinkHandlerPtr xlinkDefaultHandler = NULL; |
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52 | static xlinkNodeDetectFunc xlinkDefaultDetect = NULL; |
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53 | |
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54 | /** |
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55 | * xlinkGetDefaultHandler: |
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56 | * |
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57 | * Get the default xlink handler. |
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58 | * |
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59 | * Returns the current xlinkHandlerPtr value. |
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60 | */ |
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61 | xlinkHandlerPtr |
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62 | xlinkGetDefaultHandler(void) { |
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63 | return(xlinkDefaultHandler); |
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64 | } |
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65 | |
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66 | |
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67 | /** |
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68 | * xlinkSetDefaultHandler: |
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69 | * @handler: the new value for the xlink handler block |
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70 | * |
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71 | * Set the default xlink handlers |
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72 | */ |
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73 | void |
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74 | xlinkSetDefaultHandler(xlinkHandlerPtr handler) { |
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75 | xlinkDefaultHandler = handler; |
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76 | } |
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77 | |
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78 | /** |
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79 | * xlinkGetDefaultDetect: |
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80 | * |
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81 | * Get the default xlink detection routine |
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82 | * |
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83 | * Returns the current function or NULL; |
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84 | */ |
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85 | xlinkNodeDetectFunc |
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86 | xlinkGetDefaultDetect (void) { |
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87 | return(xlinkDefaultDetect); |
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88 | } |
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89 | |
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90 | /** |
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91 | * xlinkSetDefaultDetect: |
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92 | * @func: pointer to the new detection routine. |
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93 | * |
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94 | * Set the default xlink detection routine |
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95 | */ |
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96 | void |
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97 | xlinkSetDefaultDetect (xlinkNodeDetectFunc func) { |
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98 | xlinkDefaultDetect = func; |
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99 | } |
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100 | |
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101 | /**************************************************************** |
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102 | * * |
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103 | * The detection routines * |
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104 | * * |
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105 | ****************************************************************/ |
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106 | |
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107 | |
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108 | /** |
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109 | * xlinkIsLink: |
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110 | * @doc: the document containing the node |
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111 | * @node: the node pointer itself |
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112 | * |
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113 | * Check whether the given node carries the attributes needed |
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114 | * to be a link element (or is one of the linking elements issued |
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115 | * from the (X)HTML DtDs). |
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116 | * This routine don't try to do full checking of the link validity |
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117 | * but tries to detect and return the appropriate link type. |
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118 | * |
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119 | * Returns the xlinkType of the node (XLINK_TYPE_NONE if there is no |
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120 | * link detected. |
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121 | */ |
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122 | xlinkType |
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123 | xlinkIsLink (xmlDocPtr doc, xmlNodePtr node) { |
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124 | xmlChar *type = NULL, *role = NULL; |
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125 | xlinkType ret = XLINK_TYPE_NONE; |
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126 | |
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127 | if (node == NULL) return(XLINK_TYPE_NONE); |
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128 | if (doc == NULL) doc = node->doc; |
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129 | if ((doc != NULL) && (doc->type == XML_HTML_DOCUMENT_NODE)) { |
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130 | /* |
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131 | * This is an HTML document. |
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132 | */ |
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133 | } else if ((node->ns != NULL) && |
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134 | (xmlStrEqual(node->ns->href, XHTML_NAMESPACE))) { |
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135 | /* |
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136 | * !!!! We really need an IS_XHTML_ELEMENT function from HTMLtree.h @@@ |
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137 | */ |
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138 | /* |
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139 | * This is an XHTML element within an XML document |
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140 | * Check whether it's one of the element able to carry links |
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141 | * and in that case if it holds the attributes. |
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142 | */ |
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143 | } |
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144 | |
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145 | /* |
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146 | * We don't prevent a-priori having XML Linking constructs on |
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147 | * XHTML elements |
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148 | */ |
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149 | type = xmlGetNsProp(node, BAD_CAST"type", XLINK_NAMESPACE); |
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150 | if (type != NULL) { |
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151 | if (xmlStrEqual(type, BAD_CAST "simple")) { |
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152 | ret = XLINK_TYPE_SIMPLE; |
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153 | } if (xmlStrEqual(type, BAD_CAST "extended")) { |
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154 | role = xmlGetNsProp(node, BAD_CAST "role", XLINK_NAMESPACE); |
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155 | if (role != NULL) { |
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156 | xmlNsPtr xlink; |
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157 | xlink = xmlSearchNs(doc, node, XLINK_NAMESPACE); |
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158 | if (xlink == NULL) { |
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159 | /* Humm, fallback method */ |
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160 | if (xmlStrEqual(role, BAD_CAST"xlink:external-linkset")) |
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161 | ret = XLINK_TYPE_EXTENDED_SET; |
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162 | } else { |
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163 | xmlChar buf[200]; |
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164 | snprintf((char *) buf, sizeof(buf), "%s:external-linkset", |
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165 | (char *) xlink->prefix); |
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166 | buf[sizeof(buf) - 1] = 0; |
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167 | if (xmlStrEqual(role, buf)) |
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168 | ret = XLINK_TYPE_EXTENDED_SET; |
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169 | |
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170 | } |
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171 | |
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172 | } |
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173 | ret = XLINK_TYPE_EXTENDED; |
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174 | } |
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175 | } |
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176 | |
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177 | if (type != NULL) xmlFree(type); |
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178 | if (role != NULL) xmlFree(role); |
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179 | return(ret); |
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180 | } |
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181 | #endif /* LIBXML_XPTR_ENABLED */ |
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