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 | xmlChar *rprefix; |
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68 | xmlNsPtr rNs; |
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69 | |
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70 | sprefix = xsltGetNsProp(node, (const xmlChar *)"stylesheet-prefix", |
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71 | XSLT_NAMESPACE); |
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72 | if (sprefix == NULL) { |
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73 | xsltTransformError(NULL, style, node, |
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74 | "namespace-alias: stylesheet-prefix attribute missing\n"); |
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75 | return; |
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76 | } |
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77 | rprefix = xsltGetNsProp(node, (const xmlChar *)"result-prefix", |
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78 | XSLT_NAMESPACE); |
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79 | if (rprefix == NULL) { |
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80 | xsltTransformError(NULL, style, node, |
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81 | "namespace-alias: result-prefix attribute missing\n"); |
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82 | goto error; |
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83 | } |
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84 | if (xmlStrEqual(sprefix, (const xmlChar *)"#default")) { |
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85 | sNs = xmlSearchNs(node->doc, node, NULL); |
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86 | } else { |
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87 | sNs = xmlSearchNs(node->doc, node, sprefix); |
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88 | } |
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89 | if ((sNs == NULL) || (sNs->href == NULL)) { |
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90 | xsltTransformError(NULL, style, node, |
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91 | "namespace-alias: prefix %s not bound to any namespace\n", |
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92 | sprefix); |
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93 | goto error; |
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94 | } |
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95 | if (xmlStrEqual(rprefix, (const xmlChar *)"#default")) { |
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96 | rNs = xmlSearchNs(node->doc, node, NULL); |
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97 | } else { |
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98 | rNs = xmlSearchNs(node->doc, node, rprefix); |
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99 | } |
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100 | if ((rNs == NULL) || (rNs->href == NULL)) { |
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101 | xsltTransformError(NULL, style, node, |
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102 | "namespace-alias: prefix %s not bound to any namespace\n", |
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103 | rprefix); |
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104 | goto error; |
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105 | } |
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106 | if (style->nsAliases == NULL) |
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107 | style->nsAliases = xmlHashCreate(10); |
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108 | if (style->nsAliases == NULL) { |
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109 | xsltTransformError(NULL, style, node, |
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110 | "namespace-alias: cannot create hash table\n"); |
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111 | goto error; |
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112 | } |
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113 | xmlHashAddEntry((xmlHashTablePtr) style->nsAliases, |
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114 | sNs->href, (void *) rNs->href); |
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115 | |
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116 | error: |
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117 | if (sprefix != NULL) |
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118 | xmlFree(sprefix); |
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119 | if (rprefix != NULL) |
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120 | xmlFree(rprefix); |
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121 | } |
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122 | |
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123 | /** |
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124 | * xsltGetSpecialNamespace: |
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125 | * @ctxt: a transformation context |
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126 | * @cur: the input node |
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127 | * @URI: the namespace URI |
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128 | * @prefix: the suggested prefix |
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129 | * @out: the output node (or its parent) |
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130 | * |
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131 | * Find the right namespace value for this URI, if needed create |
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132 | * and add a new namespace decalaration on the node |
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133 | * |
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134 | * Returns the namespace node to use or NULL |
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135 | */ |
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136 | xmlNsPtr |
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137 | xsltGetSpecialNamespace(xsltTransformContextPtr ctxt, xmlNodePtr cur, |
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138 | const xmlChar *URI, const xmlChar *prefix, xmlNodePtr out) { |
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139 | xmlNsPtr ret; |
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140 | static int prefixno = 1; |
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141 | char nprefix[10]; |
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142 | |
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143 | if ((ctxt == NULL) || (cur == NULL) || (out == NULL) || (URI == NULL)) |
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144 | return(NULL); |
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145 | |
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146 | if ((prefix == NULL) && (URI[0] == 0)) { |
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147 | ret = xmlSearchNs(out->doc, out, NULL); |
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148 | if (ret != NULL) { |
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149 | ret = xmlNewNs(out, URI, prefix); |
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150 | return(ret); |
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151 | } |
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152 | return(NULL); |
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153 | } |
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154 | |
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155 | if ((out->parent != NULL) && |
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156 | (out->parent->type == XML_ELEMENT_NODE) && |
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157 | (out->parent->ns != NULL) && |
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158 | (xmlStrEqual(out->parent->ns->href, URI))) |
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159 | ret = out->parent->ns; |
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160 | else |
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161 | ret = xmlSearchNsByHref(out->doc, out, URI); |
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162 | |
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163 | if ((ret == NULL) || (ret->prefix == NULL)) { |
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164 | if (prefix == NULL) { |
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165 | do { |
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166 | sprintf(nprefix, "ns%d", prefixno++); |
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167 | ret = xmlSearchNs(out->doc, out, (xmlChar *)nprefix); |
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168 | } while (ret != NULL); |
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169 | prefix = (const xmlChar *) &nprefix[0]; |
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170 | } |
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171 | if (out->type == XML_ELEMENT_NODE) |
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172 | ret = xmlNewNs(out, URI, prefix); |
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173 | } |
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174 | return(ret); |
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175 | } |
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176 | |
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177 | /** |
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178 | * xsltGetNamespace: |
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179 | * @ctxt: a transformation context |
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180 | * @cur: the input node |
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181 | * @ns: the namespace |
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182 | * @out: the output node (or its parent) |
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183 | * |
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184 | * Find the right namespace value for this prefix, if needed create |
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185 | * and add a new namespace decalaration on the node |
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186 | * Handle namespace aliases |
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187 | * |
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188 | * Returns the namespace node to use or NULL |
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189 | */ |
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190 | xmlNsPtr |
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191 | xsltGetNamespace(xsltTransformContextPtr ctxt, xmlNodePtr cur, xmlNsPtr ns, |
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192 | xmlNodePtr out) { |
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193 | xsltStylesheetPtr style; |
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194 | xmlNsPtr ret; |
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195 | const xmlChar *URI = NULL; /* the replacement URI */ |
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196 | |
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197 | if ((ctxt == NULL) || (cur == NULL) || (out == NULL) || (ns == NULL)) |
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198 | return(NULL); |
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199 | |
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200 | style = ctxt->style; |
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201 | while (style != NULL) { |
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202 | if (style->nsAliases != NULL) |
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203 | URI = (const xmlChar *) |
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204 | xmlHashLookup(style->nsAliases, ns->href); |
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205 | if (URI != NULL) |
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206 | break; |
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207 | |
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208 | style = xsltNextImport(style); |
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209 | } |
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210 | |
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211 | if (URI == NULL) |
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212 | URI = ns->href; |
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213 | |
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214 | if ((out->parent != NULL) && |
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215 | (out->parent->type == XML_ELEMENT_NODE) && |
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216 | (out->parent->ns != NULL) && |
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217 | (xmlStrEqual(out->parent->ns->href, URI))) |
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218 | ret = out->parent->ns; |
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219 | else { |
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220 | if (ns->prefix != NULL) { |
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221 | ret = xmlSearchNs(out->doc, out, ns->prefix); |
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222 | if ((ret == NULL) || (!xmlStrEqual(ns->href, URI))) { |
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223 | ret = xmlSearchNsByHref(out->doc, out, URI); |
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224 | } |
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225 | } else { |
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226 | ret = xmlSearchNsByHref(out->doc, out, URI); |
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227 | } |
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228 | } |
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229 | |
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230 | if (ret == NULL) { |
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231 | if (out->type == XML_ELEMENT_NODE) |
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232 | ret = xmlNewNs(out, URI, ns->prefix); |
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233 | } |
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234 | return(ret); |
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235 | } |
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236 | |
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237 | /** |
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238 | * xsltCopyNamespaceList: |
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239 | * @ctxt: a transformation context |
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240 | * @node: the target node |
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241 | * @cur: the first namespace |
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242 | * |
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243 | * Do a copy of an namespace list. If @node is non-NULL the |
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244 | * new namespaces are added automatically. This handles namespaces |
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245 | * aliases |
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246 | * |
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247 | * Returns: a new xmlNsPtr, or NULL in case of error. |
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248 | */ |
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249 | xmlNsPtr |
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250 | xsltCopyNamespaceList(xsltTransformContextPtr ctxt, xmlNodePtr node, |
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251 | xmlNsPtr cur) { |
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252 | xmlNsPtr ret = NULL, tmp; |
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253 | xmlNsPtr p = NULL,q; |
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254 | const xmlChar *URI; |
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255 | |
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256 | if (cur == NULL) |
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257 | return(NULL); |
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258 | if (cur->type != XML_NAMESPACE_DECL) |
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259 | return(NULL); |
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260 | |
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261 | /* |
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262 | * One can add namespaces only on element nodes |
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263 | */ |
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264 | if ((node != NULL) && (node->type != XML_ELEMENT_NODE)) |
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265 | node = NULL; |
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266 | |
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267 | while (cur != NULL) { |
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268 | if (cur->type != XML_NAMESPACE_DECL) |
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269 | break; |
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270 | |
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271 | /* |
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272 | * Avoid duplicating namespace declrations on the tree |
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273 | */ |
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274 | if ((node != NULL) && (node->ns != NULL) && |
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275 | (xmlStrEqual(node->ns->href, cur->href)) && |
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276 | (xmlStrEqual(node->ns->prefix, cur->prefix))) { |
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277 | cur = cur->next; |
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278 | continue; |
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279 | } |
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280 | tmp = xmlSearchNs(node->doc, node, cur->prefix); |
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281 | if ((tmp != NULL) && (xmlStrEqual(tmp->href, cur->href))) { |
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282 | cur = cur->next; |
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283 | continue; |
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284 | } |
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285 | |
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286 | if (!xmlStrEqual(cur->href, XSLT_NAMESPACE)) { |
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287 | /* TODO apply cascading */ |
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288 | URI = (const xmlChar *) xmlHashLookup(ctxt->style->nsAliases, |
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289 | cur->href); |
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290 | if (URI != NULL) { |
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291 | q = xmlNewNs(node, URI, cur->prefix); |
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292 | } else { |
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293 | q = xmlNewNs(node, cur->href, cur->prefix); |
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294 | } |
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295 | if (p == NULL) { |
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296 | ret = p = q; |
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297 | } else { |
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298 | p->next = q; |
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299 | p = q; |
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300 | } |
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301 | } |
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302 | cur = cur->next; |
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303 | } |
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304 | return(ret); |
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305 | } |
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306 | |
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307 | /** |
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308 | * xsltCopyNamespace: |
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309 | * @ctxt: a transformation context |
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310 | * @node: the target node |
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311 | * @cur: the namespace node |
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312 | * |
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313 | * Do a copy of an namespace node. If @node is non-NULL the |
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314 | * new namespaces are added automatically. This handles namespaces |
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315 | * aliases |
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316 | * |
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317 | * Returns: a new xmlNsPtr, or NULL in case of error. |
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318 | */ |
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319 | xmlNsPtr |
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320 | xsltCopyNamespace(xsltTransformContextPtr ctxt, xmlNodePtr node, |
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321 | xmlNsPtr cur) { |
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322 | xmlNsPtr ret = NULL; |
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323 | const xmlChar *URI; |
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324 | |
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325 | if (cur == NULL) |
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326 | return(NULL); |
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327 | if (cur->type != XML_NAMESPACE_DECL) |
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328 | return(NULL); |
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329 | |
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330 | /* |
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331 | * One can add namespaces only on element nodes |
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332 | */ |
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333 | if ((node != NULL) && (node->type != XML_ELEMENT_NODE)) |
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334 | node = NULL; |
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335 | |
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336 | if (!xmlStrEqual(cur->href, XSLT_NAMESPACE)) { |
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337 | URI = (const xmlChar *) xmlHashLookup(ctxt->style->nsAliases, |
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338 | cur->href); |
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339 | if (URI != NULL) { |
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340 | ret = xmlNewNs(node, URI, cur->prefix); |
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341 | } else { |
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342 | ret = xmlNewNs(node, cur->href, cur->prefix); |
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343 | } |
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344 | } |
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345 | return(ret); |
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346 | } |
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347 | |
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348 | |
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349 | /** |
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350 | * xsltFreeNamespaceAliasHashes: |
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351 | * @style: an XSLT stylesheet |
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352 | * |
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353 | * Free up the memory used by namespaces aliases |
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354 | */ |
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355 | void |
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356 | xsltFreeNamespaceAliasHashes(xsltStylesheetPtr style) { |
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357 | if (style->nsAliases != NULL) |
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358 | xmlHashFree((xmlHashTablePtr) style->nsAliases, NULL); |
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359 | style->nsAliases = NULL; |
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360 | } |
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