1 | /* |
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2 | * namespaces.c: Implementation of the XSLT namespaces handling |
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3 | * |
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4 | * Reference: |
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5 | * http://www.w3.org/TR/1999/REC-xslt-19991116 |
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6 | * |
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7 | * See Copyright for the status of this software. |
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8 | * |
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9 | * daniel@veillard.com |
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10 | */ |
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11 | |
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12 | #define IN_LIBXSLT |
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13 | #include "libxslt.h" |
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14 | |
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15 | #include <string.h> |
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16 | |
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17 | #ifdef HAVE_SYS_TYPES_H |
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18 | #include <sys/types.h> |
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19 | #endif |
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20 | #ifdef HAVE_MATH_H |
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21 | #include <math.h> |
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22 | #endif |
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23 | #ifdef HAVE_FLOAT_H |
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24 | #include <float.h> |
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25 | #endif |
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26 | #ifdef HAVE_IEEEFP_H |
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27 | #include <ieeefp.h> |
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28 | #endif |
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29 | #ifdef HAVE_NAN_H |
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30 | #include <nan.h> |
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31 | #endif |
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32 | #ifdef HAVE_CTYPE_H |
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33 | #include <ctype.h> |
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34 | #endif |
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35 | |
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36 | #include <libxml/xmlmemory.h> |
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37 | #include <libxml/tree.h> |
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38 | #include <libxml/hash.h> |
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39 | #include <libxml/xmlerror.h> |
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40 | #include <libxml/uri.h> |
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41 | #include "xslt.h" |
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42 | #include "xsltInternals.h" |
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43 | #include "xsltutils.h" |
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44 | #include "namespaces.h" |
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45 | #include "imports.h" |
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46 | |
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47 | |
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48 | |
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49 | /************************************************************************ |
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50 | * * |
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51 | * Module interfaces * |
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52 | * * |
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53 | ************************************************************************/ |
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54 | |
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55 | /** |
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56 | * xsltNamespaceAlias: |
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57 | * @style: the XSLT stylesheet |
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58 | * @node: the xsl:namespace-alias node |
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59 | * |
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60 | * Read the stylesheet-prefix and result-prefix attributes, register |
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61 | * them as well as the corresponding namespace. |
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62 | */ |
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63 | void |
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64 | xsltNamespaceAlias(xsltStylesheetPtr style, xmlNodePtr node) { |
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65 | xmlChar *sprefix; |
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66 | xmlNsPtr sNs; |
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67 | const xmlChar *shref; |
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68 | xmlChar *rprefix; |
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69 | xmlNsPtr rNs; |
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70 | const xmlChar *rhref; |
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71 | |
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72 | sprefix = xsltGetNsProp(node, (const xmlChar *)"stylesheet-prefix", |
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73 | XSLT_NAMESPACE); |
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74 | if (sprefix == NULL) { |
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75 | xsltTransformError(NULL, style, node, |
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76 | "namespace-alias: stylesheet-prefix attribute missing\n"); |
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77 | return; |
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78 | } |
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79 | rprefix = xsltGetNsProp(node, (const xmlChar *)"result-prefix", |
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80 | XSLT_NAMESPACE); |
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81 | if (rprefix == NULL) { |
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82 | xsltTransformError(NULL, style, node, |
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83 | "namespace-alias: result-prefix attribute missing\n"); |
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84 | goto error; |
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85 | } |
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86 | |
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87 | if (xmlStrEqual(sprefix, (const xmlChar *)"#default")) { |
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88 | /* |
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89 | * Do we have a default namespace previously declared? |
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90 | */ |
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91 | sNs = xmlSearchNs(node->doc, node, NULL); |
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92 | if (sNs == NULL) |
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93 | shref = NULL; /* No - set NULL */ |
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94 | else |
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95 | shref = sNs->href; /* Yes - set for nsAlias table */ |
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96 | } else { |
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97 | sNs = xmlSearchNs(node->doc, node, sprefix); |
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98 | |
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99 | if ((sNs == NULL) || (sNs->href == NULL)) { |
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100 | xsltTransformError(NULL, style, node, |
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101 | "namespace-alias: prefix %s not bound to any namespace\n", |
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102 | sprefix); |
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103 | goto error; |
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104 | } else |
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105 | shref = sNs->href; |
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106 | } |
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107 | |
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108 | /* |
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109 | * When "#default" is used for result, if a default namespace has not |
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110 | * been explicitly declared the special value UNDEFINED_DEFAULT_NS is |
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111 | * put into the nsAliases table |
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112 | */ |
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113 | if (xmlStrEqual(rprefix, (const xmlChar *)"#default")) { |
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114 | rNs = xmlSearchNs(node->doc, node, NULL); |
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115 | if (rNs == NULL) |
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116 | rhref = UNDEFINED_DEFAULT_NS; |
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117 | else |
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118 | rhref = rNs->href; |
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119 | } else { |
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120 | rNs = xmlSearchNs(node->doc, node, rprefix); |
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121 | |
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122 | if ((rNs == NULL) || (rNs->href == NULL)) { |
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123 | xsltTransformError(NULL, style, node, |
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124 | "namespace-alias: prefix %s not bound to any namespace\n", |
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125 | rprefix); |
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126 | goto error; |
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127 | } else |
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128 | rhref = rNs->href; |
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129 | } |
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130 | /* |
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131 | * Special case if #default is used for stylesheet and no default has |
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132 | * been explicitly declared. We use style->defaultAlias for this |
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133 | */ |
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134 | if (shref == NULL) { |
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135 | if (rNs != NULL) |
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136 | style->defaultAlias = rNs->href; |
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137 | } else { |
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138 | if (style->nsAliases == NULL) |
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139 | style->nsAliases = xmlHashCreate(10); |
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140 | if (style->nsAliases == NULL) { |
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141 | xsltTransformError(NULL, style, node, |
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142 | "namespace-alias: cannot create hash table\n"); |
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143 | goto error; |
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144 | } |
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145 | xmlHashAddEntry((xmlHashTablePtr) style->nsAliases, |
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146 | shref, (void *) rhref); |
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147 | } |
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148 | |
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149 | error: |
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150 | if (sprefix != NULL) |
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151 | xmlFree(sprefix); |
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152 | if (rprefix != NULL) |
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153 | xmlFree(rprefix); |
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154 | } |
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155 | |
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156 | /** |
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157 | * xsltNsInScope: |
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158 | * @doc: the document |
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159 | * @node: the current node |
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160 | * @ancestor: the ancestor carrying the namespace |
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161 | * @prefix: the namespace prefix |
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162 | * |
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163 | * Copy of xmlNsInScope which is not public ... |
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164 | * |
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165 | * Returns 1 if true, 0 if false and -1 in case of error. |
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166 | */ |
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167 | static int |
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168 | xsltNsInScope(xmlDocPtr doc ATTRIBUTE_UNUSED, xmlNodePtr node, |
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169 | xmlNodePtr ancestor, const xmlChar * prefix) |
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170 | { |
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171 | xmlNsPtr tst; |
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172 | |
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173 | while ((node != NULL) && (node != ancestor)) { |
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174 | if ((node->type == XML_ENTITY_REF_NODE) || |
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175 | (node->type == XML_ENTITY_NODE) || |
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176 | (node->type == XML_ENTITY_DECL)) |
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177 | return (-1); |
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178 | if (node->type == XML_ELEMENT_NODE) { |
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179 | tst = node->nsDef; |
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180 | while (tst != NULL) { |
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181 | if ((tst->prefix == NULL) |
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182 | && (prefix == NULL)) |
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183 | return (0); |
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184 | if ((tst->prefix != NULL) |
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185 | && (prefix != NULL) |
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186 | && (xmlStrEqual(tst->prefix, prefix))) |
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187 | return (0); |
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188 | tst = tst->next; |
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189 | } |
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190 | } |
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191 | node = node->parent; |
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192 | } |
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193 | if (node != ancestor) |
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194 | return (-1); |
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195 | return (1); |
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196 | } |
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197 | |
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198 | /** |
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199 | * xsltSearchPlainNsByHref: |
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200 | * @doc: the document |
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201 | * @node: the current node |
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202 | * @href: the namespace value |
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203 | * |
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204 | * Search a Ns aliasing a given URI and without a NULL prefix. |
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205 | * Recurse on the parents until it finds |
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206 | * the defined namespace or return NULL otherwise. |
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207 | * Returns the namespace pointer or NULL. |
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208 | */ |
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209 | static xmlNsPtr |
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210 | xsltSearchPlainNsByHref(xmlDocPtr doc, xmlNodePtr node, const xmlChar * href) |
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211 | { |
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212 | xmlNsPtr cur; |
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213 | xmlNodePtr orig = node; |
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214 | |
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215 | if ((node == NULL) || (href == NULL)) |
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216 | return (NULL); |
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217 | |
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218 | while (node != NULL) { |
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219 | if ((node->type == XML_ENTITY_REF_NODE) || |
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220 | (node->type == XML_ENTITY_NODE) || |
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221 | (node->type == XML_ENTITY_DECL)) |
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222 | return (NULL); |
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223 | if (node->type == XML_ELEMENT_NODE) { |
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224 | cur = node->nsDef; |
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225 | while (cur != NULL) { |
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226 | if ((cur->href != NULL) && (cur->prefix != NULL) && |
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227 | (href != NULL) && (xmlStrEqual(cur->href, href))) { |
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228 | if (xsltNsInScope(doc, orig, node, cur->href) == 1) |
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229 | return (cur); |
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230 | } |
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231 | cur = cur->next; |
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232 | } |
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233 | if (orig != node) { |
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234 | cur = node->ns; |
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235 | if (cur != NULL) { |
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236 | if ((cur->href != NULL) && (cur->prefix != NULL) && |
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237 | (href != NULL) && (xmlStrEqual(cur->href, href))) { |
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238 | if (xsltNsInScope(doc, orig, node, cur->href) == 1) |
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239 | return (cur); |
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240 | } |
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241 | } |
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242 | } |
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243 | } |
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244 | node = node->parent; |
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245 | } |
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246 | return (NULL); |
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247 | } |
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248 | |
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249 | /** |
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250 | * xsltGetPlainNamespace: |
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251 | * @ctxt: a transformation context |
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252 | * @cur: the input node |
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253 | * @ns: the namespace |
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254 | * @out: the output node (or its parent) |
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255 | * |
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256 | * Find the right namespace value for this prefix, if needed create |
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257 | * and add a new namespace decalaration on the node |
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258 | * Handle namespace aliases and make sure the prefix is not NULL, this |
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259 | * is needed for attributes. |
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260 | * |
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261 | * Returns the namespace node to use or NULL |
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262 | */ |
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263 | xmlNsPtr |
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264 | xsltGetPlainNamespace(xsltTransformContextPtr ctxt, xmlNodePtr cur, |
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265 | xmlNsPtr ns, xmlNodePtr out) { |
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266 | xsltStylesheetPtr style; |
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267 | xmlNsPtr ret; |
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268 | const xmlChar *URI = NULL; /* the replacement URI */ |
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269 | |
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270 | if ((ctxt == NULL) || (cur == NULL) || (out == NULL) || (ns == NULL)) |
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271 | return(NULL); |
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272 | |
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273 | style = ctxt->style; |
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274 | while (style != NULL) { |
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275 | if (style->nsAliases != NULL) |
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276 | URI = (const xmlChar *) xmlHashLookup(style->nsAliases, ns->href); |
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277 | if (URI != NULL) |
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278 | break; |
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279 | |
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280 | style = xsltNextImport(style); |
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281 | } |
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282 | |
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283 | if (URI == UNDEFINED_DEFAULT_NS) { |
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284 | xmlNsPtr dflt; |
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285 | dflt = xmlSearchNs(cur->doc, cur, NULL); |
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286 | if (dflt == NULL) |
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287 | return NULL; |
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288 | else |
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289 | URI = dflt->href; |
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290 | } |
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291 | |
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292 | if (URI == NULL) |
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293 | URI = ns->href; |
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294 | |
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295 | if ((out->parent != NULL) && |
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296 | (out->parent->type == XML_ELEMENT_NODE) && |
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297 | (out->parent->ns != NULL) && |
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298 | (out->parent->ns->prefix != NULL) && |
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299 | (xmlStrEqual(out->parent->ns->href, URI))) |
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300 | ret = out->parent->ns; |
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301 | else { |
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302 | if (ns->prefix != NULL) { |
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303 | ret = xmlSearchNs(out->doc, out, ns->prefix); |
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304 | if ((ret == NULL) || (!xmlStrEqual(ret->href, URI)) || |
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305 | (ret->prefix == NULL)) { |
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306 | ret = xsltSearchPlainNsByHref(out->doc, out, URI); |
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307 | } |
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308 | } else { |
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309 | ret = xsltSearchPlainNsByHref(out->doc, out, URI); |
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310 | } |
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311 | } |
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312 | |
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313 | if (ret == NULL) { |
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314 | if (out->type == XML_ELEMENT_NODE) |
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315 | ret = xmlNewNs(out, URI, ns->prefix); |
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316 | } |
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317 | return(ret); |
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318 | } |
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319 | |
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320 | /** |
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321 | * xsltGetSpecialNamespace: |
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322 | * @ctxt: a transformation context |
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323 | * @cur: the input node |
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324 | * @URI: the namespace URI |
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325 | * @prefix: the suggested prefix |
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326 | * @out: the output node (or its parent) |
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327 | * |
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328 | * Find the right namespace value for this URI, if needed create |
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329 | * and add a new namespace decalaration on the node |
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330 | * |
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331 | * Returns the namespace node to use or NULL |
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332 | */ |
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333 | xmlNsPtr |
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334 | xsltGetSpecialNamespace(xsltTransformContextPtr ctxt, xmlNodePtr cur, |
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335 | const xmlChar *URI, const xmlChar *prefix, xmlNodePtr out) { |
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336 | xmlNsPtr ret; |
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337 | static int prefixno = 1; |
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338 | char nprefix[10]; |
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339 | |
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340 | if ((ctxt == NULL) || (cur == NULL) || (out == NULL) || (URI == NULL)) |
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341 | return(NULL); |
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342 | |
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343 | if ((prefix == NULL) && (URI[0] == 0)) { |
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344 | ret = xmlSearchNs(out->doc, out, NULL); |
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345 | if (ret != NULL) { |
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346 | ret = xmlNewNs(out, URI, prefix); |
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347 | return(ret); |
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348 | } |
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349 | return(NULL); |
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350 | } |
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351 | |
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352 | if ((out->parent != NULL) && |
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353 | (out->parent->type == XML_ELEMENT_NODE) && |
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354 | (out->parent->ns != NULL) && |
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355 | (xmlStrEqual(out->parent->ns->href, URI))) |
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356 | ret = out->parent->ns; |
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357 | else |
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358 | ret = xmlSearchNsByHref(out->doc, out, URI); |
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359 | |
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360 | if ((ret == NULL) || (ret->prefix == NULL)) { |
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361 | if (prefix == NULL) { |
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362 | do { |
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363 | sprintf(nprefix, "ns%d", prefixno++); |
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364 | ret = xmlSearchNs(out->doc, out, (xmlChar *)nprefix); |
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365 | } while (ret != NULL); |
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366 | prefix = (const xmlChar *) &nprefix[0]; |
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367 | } else if ((ret != NULL) && (ret->prefix == NULL)) { |
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368 | /* found ns but no prefix - search for the prefix */ |
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369 | ret = xmlSearchNs(out->doc, out, prefix); |
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370 | if (ret != NULL) |
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371 | return(ret); /* found it */ |
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372 | } |
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373 | if (out->type == XML_ELEMENT_NODE) |
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374 | ret = xmlNewNs(out, URI, prefix); |
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375 | } |
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376 | return(ret); |
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377 | } |
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378 | |
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379 | /** |
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380 | * xsltGetNamespace: |
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381 | * @ctxt: a transformation context |
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382 | * @cur: the input node |
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383 | * @ns: the namespace |
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384 | * @out: the output node (or its parent) |
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385 | * |
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386 | * Find the right namespace value for this prefix, if needed create |
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387 | * and add a new namespace decalaration on the node |
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388 | * Handle namespace aliases |
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389 | * |
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390 | * Returns the namespace node to use or NULL |
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391 | */ |
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392 | xmlNsPtr |
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393 | xsltGetNamespace(xsltTransformContextPtr ctxt, xmlNodePtr cur, xmlNsPtr ns, |
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394 | xmlNodePtr out) { |
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395 | xsltStylesheetPtr style; |
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396 | xmlNsPtr ret; |
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397 | const xmlChar *URI = NULL; /* the replacement URI */ |
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398 | |
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399 | if ((ctxt == NULL) || (cur == NULL) || (out == NULL) || (ns == NULL)) |
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400 | return(NULL); |
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401 | |
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402 | style = ctxt->style; |
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403 | while (style != NULL) { |
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404 | if (style->nsAliases != NULL) |
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405 | URI = (const xmlChar *) |
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406 | xmlHashLookup(style->nsAliases, ns->href); |
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407 | if (URI != NULL) |
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408 | break; |
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409 | |
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410 | style = xsltNextImport(style); |
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411 | } |
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412 | |
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413 | if (URI == UNDEFINED_DEFAULT_NS) { |
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414 | xmlNsPtr dflt; |
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415 | dflt = xmlSearchNs(cur->doc, cur, NULL); |
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416 | if (dflt != NULL) |
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417 | URI = dflt->href; |
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418 | else |
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419 | return NULL; |
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420 | } else if (URI == NULL) |
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421 | URI = ns->href; |
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422 | |
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423 | /* |
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424 | * If the parent is an XML_ELEMENT_NODE, and has the "equivalent" |
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425 | * namespace as ns (either both default, or both with a prefix |
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426 | * with the same href) then return the parent's ns record |
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427 | */ |
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428 | if ((out->parent != NULL) && |
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429 | (out->parent->type == XML_ELEMENT_NODE) && |
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430 | (out->parent->ns != NULL) && |
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431 | (((out->parent->ns->prefix == NULL) && (ns->prefix == NULL)) || |
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432 | ((out->parent->ns->prefix != NULL) && (ns->prefix != NULL))) && |
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433 | (xmlStrEqual(out->parent->ns->href, URI))) |
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434 | ret = out->parent->ns; |
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435 | else { |
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436 | /* |
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437 | * do a standard namespace search for ns in the output doc |
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438 | */ |
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439 | ret = xmlSearchNs(out->doc, out, ns->prefix); |
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440 | /* |
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441 | * if the search fails and it's not for the default prefix |
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442 | * do a search by href |
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443 | */ |
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444 | if ((ret == NULL) && (ns->prefix != NULL)) |
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445 | ret = xmlSearchNsByHref(out->doc, out, URI); |
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446 | } |
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447 | |
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448 | if (ret == NULL) { /* if no success and an element node, create the ns */ |
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449 | if (out->type == XML_ELEMENT_NODE) |
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450 | ret = xmlNewNs(out, URI, ns->prefix); |
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451 | } |
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452 | return(ret); |
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453 | } |
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454 | |
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455 | /** |
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456 | * xsltCopyNamespaceList: |
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457 | * @ctxt: a transformation context |
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458 | * @node: the target node |
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459 | * @cur: the first namespace |
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460 | * |
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461 | * Do a copy of an namespace list. If @node is non-NULL the |
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462 | * new namespaces are added automatically. This handles namespaces |
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463 | * aliases |
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464 | * |
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465 | * Returns: a new xmlNsPtr, or NULL in case of error. |
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466 | */ |
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467 | xmlNsPtr |
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468 | xsltCopyNamespaceList(xsltTransformContextPtr ctxt, xmlNodePtr node, |
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469 | xmlNsPtr cur) { |
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470 | xmlNsPtr ret = NULL, tmp; |
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471 | xmlNsPtr p = NULL,q; |
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472 | const xmlChar *URI; |
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473 | |
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474 | if (cur == NULL) |
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475 | return(NULL); |
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476 | if (cur->type != XML_NAMESPACE_DECL) |
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477 | return(NULL); |
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478 | |
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479 | /* |
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480 | * One can add namespaces only on element nodes |
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481 | */ |
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482 | if ((node != NULL) && (node->type != XML_ELEMENT_NODE)) |
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483 | node = NULL; |
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484 | |
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485 | while (cur != NULL) { |
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486 | if (cur->type != XML_NAMESPACE_DECL) |
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487 | break; |
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488 | |
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489 | /* |
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490 | * Avoid duplicating namespace declrations on the tree |
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491 | */ |
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492 | if ((node != NULL) && (node->ns != NULL) && |
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493 | (xmlStrEqual(node->ns->href, cur->href)) && |
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494 | (xmlStrEqual(node->ns->prefix, cur->prefix))) { |
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495 | cur = cur->next; |
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496 | continue; |
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497 | } |
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498 | tmp = xmlSearchNs(node->doc, node, cur->prefix); |
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499 | if ((tmp != NULL) && (xmlStrEqual(tmp->href, cur->href))) { |
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500 | cur = cur->next; |
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501 | continue; |
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502 | } |
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503 | |
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504 | if (!xmlStrEqual(cur->href, XSLT_NAMESPACE)) { |
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505 | /* TODO apply cascading */ |
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506 | URI = (const xmlChar *) xmlHashLookup(ctxt->style->nsAliases, |
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507 | cur->href); |
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508 | if (URI == UNDEFINED_DEFAULT_NS) |
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509 | continue; |
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510 | if (URI != NULL) { |
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511 | q = xmlNewNs(node, URI, cur->prefix); |
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512 | } else { |
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513 | q = xmlNewNs(node, cur->href, cur->prefix); |
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514 | } |
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515 | if (p == NULL) { |
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516 | ret = p = q; |
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517 | } else { |
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518 | p->next = q; |
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519 | p = q; |
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520 | } |
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521 | } |
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522 | cur = cur->next; |
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523 | } |
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524 | return(ret); |
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525 | } |
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526 | |
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527 | /** |
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528 | * xsltCopyNamespace: |
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529 | * @ctxt: a transformation context |
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530 | * @node: the target node |
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531 | * @cur: the namespace node |
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532 | * |
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533 | * Do a copy of an namespace node. If @node is non-NULL the |
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534 | * new namespaces are added automatically. This handles namespaces |
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535 | * aliases |
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536 | * |
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537 | * Returns: a new xmlNsPtr, or NULL in case of error. |
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538 | */ |
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539 | xmlNsPtr |
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540 | xsltCopyNamespace(xsltTransformContextPtr ctxt, xmlNodePtr node, |
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541 | xmlNsPtr cur) { |
---|
542 | xmlNsPtr ret = NULL; |
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543 | const xmlChar *URI; |
---|
544 | |
---|
545 | if (cur == NULL) |
---|
546 | return(NULL); |
---|
547 | if (cur->type != XML_NAMESPACE_DECL) |
---|
548 | return(NULL); |
---|
549 | |
---|
550 | /* |
---|
551 | * One can add namespaces only on element nodes |
---|
552 | */ |
---|
553 | if ((node != NULL) && (node->type != XML_ELEMENT_NODE)) |
---|
554 | node = NULL; |
---|
555 | |
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556 | if (!xmlStrEqual(cur->href, XSLT_NAMESPACE)) { |
---|
557 | URI = (const xmlChar *) xmlHashLookup(ctxt->style->nsAliases, |
---|
558 | cur->href); |
---|
559 | if (URI == UNDEFINED_DEFAULT_NS) |
---|
560 | return(NULL); |
---|
561 | if (URI != NULL) { |
---|
562 | ret = xmlNewNs(node, URI, cur->prefix); |
---|
563 | } else { |
---|
564 | ret = xmlNewNs(node, cur->href, cur->prefix); |
---|
565 | } |
---|
566 | } |
---|
567 | return(ret); |
---|
568 | } |
---|
569 | |
---|
570 | |
---|
571 | /** |
---|
572 | * xsltFreeNamespaceAliasHashes: |
---|
573 | * @style: an XSLT stylesheet |
---|
574 | * |
---|
575 | * Free up the memory used by namespaces aliases |
---|
576 | */ |
---|
577 | void |
---|
578 | xsltFreeNamespaceAliasHashes(xsltStylesheetPtr style) { |
---|
579 | if (style->nsAliases != NULL) |
---|
580 | xmlHashFree((xmlHashTablePtr) style->nsAliases, NULL); |
---|
581 | style->nsAliases = NULL; |
---|
582 | } |
---|