1 | /* |
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2 | * templates.c: Implementation of the template processing |
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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 | #include <libxml/xmlmemory.h> |
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18 | #include <libxml/globals.h> |
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19 | #include <libxml/xmlerror.h> |
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20 | #include <libxml/tree.h> |
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21 | #include <libxml/xpathInternals.h> |
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22 | #include <libxml/parserInternals.h> |
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23 | #include "xslt.h" |
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24 | #include "xsltInternals.h" |
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25 | #include "xsltutils.h" |
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26 | #include "variables.h" |
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27 | #include "functions.h" |
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28 | #include "templates.h" |
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29 | #include "transform.h" |
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30 | #include "namespaces.h" |
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31 | #include "attributes.h" |
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32 | |
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33 | #ifdef WITH_XSLT_DEBUG |
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34 | #define WITH_XSLT_DEBUG_TEMPLATES |
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35 | #endif |
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36 | |
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37 | /************************************************************************ |
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38 | * * |
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39 | * Module interfaces * |
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40 | * * |
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41 | ************************************************************************/ |
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42 | |
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43 | /** |
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44 | * xsltEvalXPathPredicate: |
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45 | * @ctxt: the XSLT transformation context |
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46 | * @comp: the XPath compiled expression |
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47 | * @nsList: the namespaces in scope |
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48 | * @nsNr: the number of namespaces in scope |
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49 | * |
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50 | * Process the expression using XPath and evaluate the result as |
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51 | * an XPath predicate |
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52 | * |
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53 | * Returns 1 is the predicate was true, 0 otherwise |
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54 | */ |
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55 | int |
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56 | xsltEvalXPathPredicate(xsltTransformContextPtr ctxt, xmlXPathCompExprPtr comp, |
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57 | xmlNsPtr *nsList, int nsNr) { |
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58 | int ret; |
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59 | xmlXPathObjectPtr res; |
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60 | int oldNsNr; |
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61 | xmlNsPtr *oldNamespaces; |
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62 | xmlNodePtr oldInst; |
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63 | int oldProximityPosition, oldContextSize; |
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64 | |
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65 | oldContextSize = ctxt->xpathCtxt->contextSize; |
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66 | oldProximityPosition = ctxt->xpathCtxt->proximityPosition; |
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67 | oldNsNr = ctxt->xpathCtxt->nsNr; |
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68 | oldNamespaces = ctxt->xpathCtxt->namespaces; |
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69 | oldInst = ctxt->inst; |
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70 | |
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71 | ctxt->xpathCtxt->node = ctxt->node; |
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72 | ctxt->xpathCtxt->namespaces = nsList; |
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73 | ctxt->xpathCtxt->nsNr = nsNr; |
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74 | |
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75 | res = xmlXPathCompiledEval(comp, ctxt->xpathCtxt); |
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76 | |
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77 | if (res != NULL) { |
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78 | ret = xmlXPathEvalPredicate(ctxt->xpathCtxt, res); |
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79 | xmlXPathFreeObject(res); |
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80 | #ifdef WITH_XSLT_DEBUG_TEMPLATES |
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81 | xsltGenericDebug(xsltGenericDebugContext, |
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82 | "xsltEvalXPathPredicate: returns %d\n", ret); |
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83 | #endif |
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84 | } else { |
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85 | #ifdef WITH_XSLT_DEBUG_TEMPLATES |
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86 | xsltGenericDebug(xsltGenericDebugContext, |
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87 | "xsltEvalXPathPredicate: failed\n"); |
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88 | #endif |
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89 | ctxt->state = XSLT_STATE_STOPPED; |
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90 | ret = 0; |
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91 | } |
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92 | ctxt->xpathCtxt->nsNr = oldNsNr; |
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93 | |
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94 | ctxt->xpathCtxt->namespaces = oldNamespaces; |
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95 | ctxt->inst = oldInst; |
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96 | ctxt->xpathCtxt->contextSize = oldContextSize; |
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97 | ctxt->xpathCtxt->proximityPosition = oldProximityPosition; |
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98 | |
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99 | return(ret); |
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100 | } |
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101 | |
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102 | /** |
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103 | * xsltEvalXPathStringNs: |
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104 | * @ctxt: the XSLT transformation context |
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105 | * @comp: the compiled XPath expression |
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106 | * @nsNr: the number of namespaces in the list |
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107 | * @nsList: the list of in-scope namespaces to use |
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108 | * |
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109 | * Process the expression using XPath, allowing to pass a namespace mapping |
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110 | * context and get a string |
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111 | * |
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112 | * Returns the computed string value or NULL, must be deallocated by the |
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113 | * caller. |
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114 | */ |
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115 | xmlChar * |
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116 | xsltEvalXPathStringNs(xsltTransformContextPtr ctxt, xmlXPathCompExprPtr comp, |
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117 | int nsNr, xmlNsPtr *nsList) { |
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118 | xmlChar *ret = NULL; |
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119 | xmlXPathObjectPtr res; |
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120 | xmlNodePtr oldInst; |
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121 | xmlNodePtr oldNode; |
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122 | int oldPos, oldSize; |
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123 | int oldNsNr; |
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124 | xmlNsPtr *oldNamespaces; |
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125 | |
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126 | oldInst = ctxt->inst; |
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127 | oldNode = ctxt->node; |
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128 | oldPos = ctxt->xpathCtxt->proximityPosition; |
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129 | oldSize = ctxt->xpathCtxt->contextSize; |
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130 | oldNsNr = ctxt->xpathCtxt->nsNr; |
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131 | oldNamespaces = ctxt->xpathCtxt->namespaces; |
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132 | |
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133 | ctxt->xpathCtxt->node = ctxt->node; |
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134 | /* TODO: do we need to propagate the namespaces here ? */ |
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135 | ctxt->xpathCtxt->namespaces = nsList; |
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136 | ctxt->xpathCtxt->nsNr = nsNr; |
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137 | res = xmlXPathCompiledEval(comp, ctxt->xpathCtxt); |
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138 | if (res != NULL) { |
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139 | if (res->type != XPATH_STRING) |
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140 | res = xmlXPathConvertString(res); |
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141 | if (res->type == XPATH_STRING) { |
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142 | ret = res->stringval; |
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143 | res->stringval = NULL; |
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144 | } else { |
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145 | xsltTransformError(ctxt, NULL, NULL, |
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146 | "xpath : string() function didn't return a String\n"); |
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147 | } |
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148 | xmlXPathFreeObject(res); |
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149 | } else { |
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150 | ctxt->state = XSLT_STATE_STOPPED; |
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151 | } |
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152 | #ifdef WITH_XSLT_DEBUG_TEMPLATES |
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153 | xsltGenericDebug(xsltGenericDebugContext, |
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154 | "xsltEvalXPathString: returns %s\n", ret); |
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155 | #endif |
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156 | ctxt->inst = oldInst; |
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157 | ctxt->node = oldNode; |
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158 | ctxt->xpathCtxt->contextSize = oldSize; |
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159 | ctxt->xpathCtxt->proximityPosition = oldPos; |
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160 | ctxt->xpathCtxt->nsNr = oldNsNr; |
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161 | ctxt->xpathCtxt->namespaces = oldNamespaces; |
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162 | return(ret); |
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163 | } |
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164 | |
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165 | /** |
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166 | * xsltEvalXPathString: |
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167 | * @ctxt: the XSLT transformation context |
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168 | * @comp: the compiled XPath expression |
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169 | * |
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170 | * Process the expression using XPath and get a string |
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171 | * |
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172 | * Returns the computed string value or NULL, must be deallocated by the |
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173 | * caller. |
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174 | */ |
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175 | xmlChar * |
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176 | xsltEvalXPathString(xsltTransformContextPtr ctxt, xmlXPathCompExprPtr comp) { |
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177 | return(xsltEvalXPathStringNs(ctxt, comp, 0, NULL)); |
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178 | } |
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179 | |
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180 | /** |
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181 | * xsltEvalTemplateString: |
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182 | * @ctxt: the XSLT transformation context |
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183 | * @node: the stylesheet node |
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184 | * @parent: the content parent |
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185 | * |
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186 | * Evaluate a template string value, i.e. the parent list is interpreter |
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187 | * as template content and the resulting tree string value is returned |
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188 | * This is needed for example by xsl:comment and xsl:processing-instruction |
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189 | * |
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190 | * Returns the computed string value or NULL, must be deallocated by the |
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191 | * caller. |
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192 | */ |
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193 | xmlChar * |
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194 | xsltEvalTemplateString(xsltTransformContextPtr ctxt, xmlNodePtr node, |
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195 | xmlNodePtr parent) { |
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196 | xmlNodePtr oldInsert, insert = NULL; |
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197 | xmlChar *ret; |
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198 | |
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199 | if ((ctxt == NULL) || (node == NULL) || (parent == NULL)) |
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200 | return(NULL); |
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201 | |
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202 | if (parent->children == NULL) |
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203 | return(NULL); |
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204 | |
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205 | insert = xmlNewDocNode(ctxt->output, NULL, |
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206 | (const xmlChar *)"fake", NULL); |
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207 | if (insert == NULL) |
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208 | return(NULL); |
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209 | oldInsert = ctxt->insert; |
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210 | ctxt->insert = insert; |
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211 | |
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212 | xsltApplyOneTemplate(ctxt, node, parent->children, NULL, NULL); |
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213 | |
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214 | ctxt->insert = oldInsert; |
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215 | |
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216 | ret = xmlNodeGetContent(insert); |
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217 | if (insert != NULL) |
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218 | xmlFreeNode(insert); |
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219 | return(ret); |
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220 | } |
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221 | |
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222 | /** |
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223 | * xsltAttrTemplateValueProcessNode: |
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224 | * @ctxt: the XSLT transformation context |
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225 | * @str: the attribute template node value |
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226 | * @node: the node hosting the attribute |
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227 | * |
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228 | * Process the given string, allowing to pass a namespace mapping |
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229 | * context and return the new string value. |
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230 | * |
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231 | * Returns the computed string value or NULL, must be deallocated by the |
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232 | * caller. |
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233 | */ |
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234 | xmlChar * |
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235 | xsltAttrTemplateValueProcessNode(xsltTransformContextPtr ctxt, |
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236 | const xmlChar *str, xmlNodePtr node) { |
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237 | xmlChar *ret = NULL; |
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238 | const xmlChar *cur; |
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239 | xmlChar *expr, *val; |
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240 | xmlNsPtr *nsList = NULL; |
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241 | int nsNr = 0; |
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242 | |
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243 | if (str == NULL) return(NULL); |
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244 | if (*str == 0) |
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245 | return(xmlStrndup((xmlChar *)"", 0)); |
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246 | |
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247 | cur = str; |
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248 | while (*cur != 0) { |
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249 | if (*cur == '{') { |
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250 | ret = xmlStrncat(ret, str, cur - str); |
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251 | str = cur; |
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252 | cur++; |
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253 | while ((*cur != 0) && (*cur != '}')) cur++; |
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254 | if (*cur == 0) { |
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255 | ret = xmlStrncat(ret, str, cur - str); |
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256 | return(ret); |
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257 | } |
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258 | str++; |
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259 | expr = xmlStrndup(str, cur - str); |
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260 | if (expr == NULL) |
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261 | return(ret); |
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262 | else if (*expr == '{') { |
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263 | ret = xmlStrcat(ret, expr); |
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264 | xmlFree(expr); |
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265 | } else { |
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266 | xmlXPathCompExprPtr comp; |
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267 | /* |
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268 | * TODO: keep precompiled form around |
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269 | */ |
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270 | if ((nsList == NULL) && (node != NULL)) { |
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271 | int i = 0; |
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272 | |
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273 | nsList = xmlGetNsList(node->doc, node); |
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274 | if (nsList != NULL) { |
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275 | while (nsList[i] != NULL) |
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276 | i++; |
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277 | nsNr = i; |
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278 | } |
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279 | } |
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280 | comp = xmlXPathCompile(expr); |
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281 | val = xsltEvalXPathStringNs(ctxt, comp, nsNr, nsList); |
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282 | xmlXPathFreeCompExpr(comp); |
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283 | xmlFree(expr); |
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284 | if (val != NULL) { |
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285 | ret = xmlStrcat(ret, val); |
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286 | xmlFree(val); |
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287 | } |
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288 | } |
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289 | cur++; |
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290 | str = cur; |
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291 | } else |
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292 | cur++; |
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293 | } |
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294 | if (cur != str) { |
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295 | ret = xmlStrncat(ret, str, cur - str); |
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296 | } |
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297 | |
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298 | if (nsList != NULL) |
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299 | xmlFree(nsList); |
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300 | |
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301 | return(ret); |
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302 | } |
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303 | |
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304 | /** |
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305 | * xsltAttrTemplateValueProcess: |
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306 | * @ctxt: the XSLT transformation context |
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307 | * @str: the attribute template node value |
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308 | * |
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309 | * Process the given node and return the new string value. |
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310 | * |
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311 | * Returns the computed string value or NULL, must be deallocated by the |
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312 | * caller. |
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313 | */ |
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314 | xmlChar * |
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315 | xsltAttrTemplateValueProcess(xsltTransformContextPtr ctxt, const xmlChar *str) { |
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316 | return(xsltAttrTemplateValueProcessNode(ctxt, str, NULL)); |
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317 | } |
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318 | |
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319 | /** |
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320 | * xsltEvalAttrValueTemplate: |
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321 | * @ctxt: the XSLT transformation context |
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322 | * @node: the stylesheet node |
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323 | * @name: the attribute QName |
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324 | * @ns: the attribute namespace URI |
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325 | * |
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326 | * Evaluate a attribute value template, i.e. the attribute value can |
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327 | * contain expressions contained in curly braces ({}) and those are |
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328 | * substituted by they computed value. |
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329 | * |
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330 | * Returns the computed string value or NULL, must be deallocated by the |
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331 | * caller. |
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332 | */ |
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333 | xmlChar * |
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334 | xsltEvalAttrValueTemplate(xsltTransformContextPtr ctxt, xmlNodePtr node, |
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335 | const xmlChar *name, const xmlChar *ns) { |
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336 | xmlChar *ret; |
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337 | xmlChar *expr; |
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338 | |
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339 | if ((ctxt == NULL) || (node == NULL) || (name == NULL)) |
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340 | return(NULL); |
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341 | |
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342 | expr = xsltGetNsProp(node, name, ns); |
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343 | if (expr == NULL) |
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344 | return(NULL); |
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345 | |
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346 | /* |
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347 | * TODO: though now {} is detected ahead, it would still be good to |
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348 | * optimize both functions to keep the splitted value if the |
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349 | * attribute content and the XPath precompiled expressions around |
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350 | */ |
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351 | |
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352 | ret = xsltAttrTemplateValueProcessNode(ctxt, expr, node); |
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353 | #ifdef WITH_XSLT_DEBUG_TEMPLATES |
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354 | xsltGenericDebug(xsltGenericDebugContext, |
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355 | "xsltEvalAttrValueTemplate: %s returns %s\n", expr, ret); |
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356 | #endif |
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357 | if (expr != NULL) |
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358 | xmlFree(expr); |
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359 | return(ret); |
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360 | } |
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361 | |
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362 | /** |
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363 | * xsltEvalStaticAttrValueTemplate: |
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364 | * @style: the XSLT stylesheet |
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365 | * @node: the stylesheet node |
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366 | * @name: the attribute Name |
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367 | * @ns: the attribute namespace URI |
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368 | * @found: indicator whether the attribute is present |
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369 | * |
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370 | * Check if an attribute value template has a static value, i.e. the |
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371 | * attribute value does not contain expressions contained in curly braces ({}) |
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372 | * |
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373 | * Returns the static string value or NULL, must be deallocated by the |
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374 | * caller. |
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375 | */ |
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376 | xmlChar * |
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377 | xsltEvalStaticAttrValueTemplate(xsltStylesheetPtr style, xmlNodePtr node, |
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378 | const xmlChar *name, const xmlChar *ns, int *found) { |
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379 | const xmlChar *ret; |
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380 | xmlChar *expr; |
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381 | |
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382 | if ((style == NULL) || (node == NULL) || (name == NULL)) |
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383 | return(NULL); |
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384 | |
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385 | expr = xsltGetNsProp(node, name, ns); |
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386 | if (expr == NULL) { |
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387 | *found = 0; |
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388 | return(NULL); |
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389 | } |
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390 | *found = 1; |
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391 | |
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392 | ret = xmlStrchr(expr, '{'); |
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393 | if (ret != NULL) { |
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394 | xmlFree(expr); |
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395 | return(NULL); |
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396 | } |
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397 | return(expr); |
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398 | } |
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399 | |
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400 | /** |
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401 | * xsltAttrTemplateProcess: |
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402 | * @ctxt: the XSLT transformation context |
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403 | * @target: the result node |
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404 | * @cur: the attribute template node |
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405 | * |
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406 | * Process the given attribute and return the new processed copy. |
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407 | * |
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408 | * Returns the attribute replacement. |
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409 | */ |
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410 | xmlAttrPtr |
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411 | xsltAttrTemplateProcess(xsltTransformContextPtr ctxt, xmlNodePtr target, |
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412 | xmlAttrPtr cur) { |
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413 | xmlNsPtr ns; |
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414 | xmlAttrPtr ret; |
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415 | if ((ctxt == NULL) || (cur == NULL)) |
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416 | return(NULL); |
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417 | |
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418 | if (cur->type != XML_ATTRIBUTE_NODE) |
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419 | return(NULL); |
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420 | |
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421 | if ((cur->ns != NULL) && |
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422 | (xmlStrEqual(cur->ns->href, XSLT_NAMESPACE))) { |
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423 | if (xmlStrEqual(cur->name, (const xmlChar *)"use-attribute-sets")) { |
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424 | xmlChar *in; |
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425 | |
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426 | in = xmlNodeListGetString(ctxt->document->doc, cur->children, 1); |
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427 | if (in != NULL) { |
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428 | xsltApplyAttributeSet(ctxt, ctxt->node, NULL, in); |
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429 | xmlFree(in); |
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430 | } |
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431 | } |
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432 | return(NULL); |
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433 | } |
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434 | if (cur->ns != NULL) |
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435 | ns = xsltGetNamespace(ctxt, cur->parent, cur->ns, target); |
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436 | else |
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437 | ns = NULL; |
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438 | |
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439 | if (cur->children != NULL) { |
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440 | xmlChar *in = xmlNodeListGetString(ctxt->document->doc, |
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441 | cur->children, 1); |
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442 | xmlChar *out; |
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443 | |
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444 | /* TODO: optimize if no template value was detected */ |
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445 | if (in != NULL) { |
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446 | out = xsltAttrTemplateValueProcessNode(ctxt, in, cur->parent); |
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447 | ret = xmlSetNsProp(target, ns, cur->name, out); |
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448 | if (out != NULL) |
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449 | xmlFree(out); |
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450 | xmlFree(in); |
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451 | } else |
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452 | ret = xmlSetNsProp(target, ns, cur->name, (const xmlChar *)""); |
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453 | |
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454 | } else |
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455 | ret = xmlSetNsProp(target, ns, cur->name, (const xmlChar *)""); |
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456 | return(ret); |
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457 | } |
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458 | |
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459 | |
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460 | /** |
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461 | * xsltAttrListTemplateProcess: |
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462 | * @ctxt: the XSLT transformation context |
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463 | * @target: the element where the attributes will be grafted |
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464 | * @cur: the first attribute |
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465 | * |
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466 | * Do a copy of an attribute list with attribute template processing |
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467 | * |
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468 | * Returns: a new xmlAttrPtr, or NULL in case of error. |
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469 | */ |
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470 | xmlAttrPtr |
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471 | xsltAttrListTemplateProcess(xsltTransformContextPtr ctxt, |
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472 | xmlNodePtr target, xmlAttrPtr cur) { |
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473 | xmlAttrPtr ret = NULL; |
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474 | xmlAttrPtr q; |
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475 | xmlNodePtr oldInsert; |
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476 | |
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477 | oldInsert = ctxt->insert; |
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478 | ctxt->insert = target; |
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479 | while (cur != NULL) { |
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480 | q = xsltAttrTemplateProcess(ctxt, target, cur); |
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481 | if (q != NULL) { |
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482 | q->parent = target; |
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483 | q->doc = ctxt->output; |
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484 | if (ret == NULL) { |
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485 | ret = q; |
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486 | } |
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487 | } |
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488 | cur = cur->next; |
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489 | } |
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490 | ctxt->insert = oldInsert; |
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491 | return(ret); |
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492 | } |
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493 | |
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494 | |
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495 | /** |
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496 | * xsltTemplateProcess: |
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497 | * @ctxt: the XSLT transformation context |
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498 | * @node: the attribute template node |
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499 | * |
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500 | * Process the given node and return the new string value. |
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501 | * |
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502 | * Returns the computed tree replacement |
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503 | */ |
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504 | xmlNodePtr * |
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505 | xsltTemplateProcess(xsltTransformContextPtr ctxt ATTRIBUTE_UNUSED, xmlNodePtr node) { |
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506 | if (node == NULL) |
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507 | return(NULL); |
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508 | |
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509 | return(0); |
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510 | } |
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511 | |
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512 | |
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