[18214] | 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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