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wine/libs/xslt/libxslt/pattern.c
Alexandre Julliard 6b678a4e9b xslt: Import upstream release 1.1.38.
2023-06-05 12:09:29 +02:00

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/*
* pattern.c: Implemetation of the template match compilation and lookup
*
* Reference:
* http://www.w3.org/TR/1999/REC-xslt-19991116
*
* See Copyright for the status of this software.
*
* daniel@veillard.com
*/
/*
* TODO: handle pathological cases like *[*[@a="b"]]
* TODO: detect [number] at compilation, optimize accordingly
*/
#define IN_LIBXSLT
#include "libxslt.h"
#include <string.h>
#include <libxml/xmlmemory.h>
#include <libxml/tree.h>
#include <libxml/valid.h>
#include <libxml/hash.h>
#include <libxml/xmlerror.h>
#include <libxml/parserInternals.h>
#include <libxml/xpath.h>
#include "xslt.h"
#include "xsltInternals.h"
#include "xsltutils.h"
#include "imports.h"
#include "templates.h"
#include "keys.h"
#include "pattern.h"
#include "documents.h"
#ifdef WITH_XSLT_DEBUG
#define WITH_XSLT_DEBUG_PATTERN
#endif
/*
* Types are private:
*/
typedef enum {
XSLT_OP_END=0,
XSLT_OP_ROOT,
XSLT_OP_ELEM,
XSLT_OP_ATTR,
XSLT_OP_PARENT,
XSLT_OP_ANCESTOR,
XSLT_OP_ID,
XSLT_OP_KEY,
XSLT_OP_NS,
XSLT_OP_ALL,
XSLT_OP_PI,
XSLT_OP_COMMENT,
XSLT_OP_TEXT,
XSLT_OP_NODE,
XSLT_OP_PREDICATE
} xsltOp;
typedef enum {
AXIS_CHILD=1,
AXIS_ATTRIBUTE
} xsltAxis;
typedef struct _xsltStepState xsltStepState;
typedef xsltStepState *xsltStepStatePtr;
struct _xsltStepState {
int step;
xmlNodePtr node;
};
typedef struct _xsltStepStates xsltStepStates;
typedef xsltStepStates *xsltStepStatesPtr;
struct _xsltStepStates {
int nbstates;
int maxstates;
xsltStepStatePtr states;
};
typedef struct _xsltStepOp xsltStepOp;
typedef xsltStepOp *xsltStepOpPtr;
struct _xsltStepOp {
xsltOp op;
xmlChar *value;
xmlChar *value2;
xmlChar *value3;
xmlXPathCompExprPtr comp;
/*
* Optimisations for count
*/
int previousExtra;
int indexExtra;
int lenExtra;
};
struct _xsltCompMatch {
struct _xsltCompMatch *next; /* siblings in the name hash */
float priority; /* the priority */
const xmlChar *pattern; /* the pattern */
const xmlChar *mode; /* the mode */
const xmlChar *modeURI; /* the mode URI */
xsltTemplatePtr template; /* the associated template */
xmlNodePtr node; /* the containing element */
int direct;
/* TODO fix the statically allocated size steps[] */
int nbStep;
int maxStep;
xmlNsPtr *nsList; /* the namespaces in scope */
int nsNr; /* the number of namespaces in scope */
xsltStepOpPtr steps; /* ops for computation */
};
typedef struct _xsltParserContext xsltParserContext;
typedef xsltParserContext *xsltParserContextPtr;
struct _xsltParserContext {
xsltStylesheetPtr style; /* the stylesheet */
xsltTransformContextPtr ctxt; /* the transformation or NULL */
const xmlChar *cur; /* the current char being parsed */
const xmlChar *base; /* the full expression */
xmlDocPtr doc; /* the source document */
xmlNodePtr elem; /* the source element */
int error; /* error code */
xsltCompMatchPtr comp; /* the result */
};
/************************************************************************
* *
* Type functions *
* *
************************************************************************/
/**
* xsltNewCompMatch:
*
* Create a new XSLT CompMatch
*
* Returns the newly allocated xsltCompMatchPtr or NULL in case of error
*/
static xsltCompMatchPtr
xsltNewCompMatch(void) {
xsltCompMatchPtr cur;
cur = (xsltCompMatchPtr) xmlMalloc(sizeof(xsltCompMatch));
if (cur == NULL) {
xsltTransformError(NULL, NULL, NULL,
"xsltNewCompMatch : out of memory error\n");
return(NULL);
}
memset(cur, 0, sizeof(xsltCompMatch));
cur->maxStep = 10;
cur->nbStep = 0;
cur-> steps = (xsltStepOpPtr) xmlMalloc(sizeof(xsltStepOp) *
cur->maxStep);
if (cur->steps == NULL) {
xsltTransformError(NULL, NULL, NULL,
"xsltNewCompMatch : out of memory error\n");
xmlFree(cur);
return(NULL);
}
cur->nsNr = 0;
cur->nsList = NULL;
cur->direct = 0;
return(cur);
}
/**
* xsltFreeCompMatch:
* @comp: an XSLT comp
*
* Free up the memory allocated by @comp
*/
static void
xsltFreeCompMatch(xsltCompMatchPtr comp) {
xsltStepOpPtr op;
int i;
if (comp == NULL)
return;
if (comp->pattern != NULL)
xmlFree((xmlChar *)comp->pattern);
if (comp->nsList != NULL)
xmlFree(comp->nsList);
for (i = 0;i < comp->nbStep;i++) {
op = &comp->steps[i];
if (op->value != NULL)
xmlFree(op->value);
if (op->value2 != NULL)
xmlFree(op->value2);
if (op->value3 != NULL)
xmlFree(op->value3);
if (op->comp != NULL)
xmlXPathFreeCompExpr(op->comp);
}
xmlFree(comp->steps);
memset(comp, -1, sizeof(xsltCompMatch));
xmlFree(comp);
}
/**
* xsltFreeCompMatchList:
* @comp: an XSLT comp list
*
* Free up the memory allocated by all the elements of @comp
*/
void
xsltFreeCompMatchList(xsltCompMatchPtr comp) {
xsltCompMatchPtr cur;
while (comp != NULL) {
cur = comp;
comp = comp->next;
xsltFreeCompMatch(cur);
}
}
static void
xsltFreeCompMatchListEntry(void *payload,
const xmlChar *name ATTRIBUTE_UNUSED) {
xsltFreeCompMatchList((xsltCompMatchPtr) payload);
}
/**
* xsltNormalizeCompSteps:
* @payload: pointer to template hash table entry
* @data: pointer to the stylesheet
* @name: template match name
*
* This is a hashtable scanner function to normalize the compiled
* steps of an imported stylesheet.
*/
void xsltNormalizeCompSteps(void *payload,
void *data, const xmlChar *name ATTRIBUTE_UNUSED) {
xsltCompMatchPtr comp = payload;
xsltStylesheetPtr style = data;
int ix;
for (ix = 0; ix < comp->nbStep; ix++) {
comp->steps[ix].previousExtra += style->extrasNr;
comp->steps[ix].indexExtra += style->extrasNr;
comp->steps[ix].lenExtra += style->extrasNr;
}
}
/**
* xsltNewParserContext:
* @style: the stylesheet
* @ctxt: the transformation context, if done at run-time
*
* Create a new XSLT ParserContext
*
* Returns the newly allocated xsltParserContextPtr or NULL in case of error
*/
static xsltParserContextPtr
xsltNewParserContext(xsltStylesheetPtr style, xsltTransformContextPtr ctxt) {
xsltParserContextPtr cur;
cur = (xsltParserContextPtr) xmlMalloc(sizeof(xsltParserContext));
if (cur == NULL) {
xsltTransformError(NULL, NULL, NULL,
"xsltNewParserContext : malloc failed\n");
return(NULL);
}
memset(cur, 0, sizeof(xsltParserContext));
cur->style = style;
cur->ctxt = ctxt;
return(cur);
}
/**
* xsltFreeParserContext:
* @ctxt: an XSLT parser context
*
* Free up the memory allocated by @ctxt
*/
static void
xsltFreeParserContext(xsltParserContextPtr ctxt) {
if (ctxt == NULL)
return;
memset(ctxt, -1, sizeof(xsltParserContext));
xmlFree(ctxt);
}
/**
* xsltCompMatchAdd:
* @comp: the compiled match expression
* @op: an op
* @value: the first value
* @value2: the second value
* @novar: flag to set XML_XPATH_NOVAR
*
* Add an step to an XSLT Compiled Match
*
* Returns -1 in case of failure, 0 otherwise.
*/
static int
xsltCompMatchAdd(xsltParserContextPtr ctxt, xsltCompMatchPtr comp,
xsltOp op, xmlChar * value, xmlChar * value2, int novar)
{
if (comp->nbStep >= comp->maxStep) {
xsltStepOpPtr tmp;
tmp = (xsltStepOpPtr) xmlRealloc(comp->steps, comp->maxStep * 2 *
sizeof(xsltStepOp));
if (tmp == NULL) {
xsltGenericError(xsltGenericErrorContext,
"xsltCompMatchAdd: memory re-allocation failure.\n");
if (ctxt->style != NULL)
ctxt->style->errors++;
return (-1);
}
comp->maxStep *= 2;
comp->steps = tmp;
}
comp->steps[comp->nbStep].op = op;
comp->steps[comp->nbStep].value = value;
comp->steps[comp->nbStep].value2 = value2;
comp->steps[comp->nbStep].value3 = NULL;
comp->steps[comp->nbStep].comp = NULL;
if (ctxt->ctxt != NULL) {
comp->steps[comp->nbStep].previousExtra =
xsltAllocateExtraCtxt(ctxt->ctxt);
comp->steps[comp->nbStep].indexExtra =
xsltAllocateExtraCtxt(ctxt->ctxt);
comp->steps[comp->nbStep].lenExtra =
xsltAllocateExtraCtxt(ctxt->ctxt);
} else {
comp->steps[comp->nbStep].previousExtra =
xsltAllocateExtra(ctxt->style);
comp->steps[comp->nbStep].indexExtra =
xsltAllocateExtra(ctxt->style);
comp->steps[comp->nbStep].lenExtra =
xsltAllocateExtra(ctxt->style);
}
if (op == XSLT_OP_PREDICATE) {
int flags = 0;
#ifdef XML_XPATH_NOVAR
if (novar != 0)
flags = XML_XPATH_NOVAR;
#endif
comp->steps[comp->nbStep].comp = xsltXPathCompileFlags(ctxt->style,
value, flags);
if (comp->steps[comp->nbStep].comp == NULL) {
xsltTransformError(NULL, ctxt->style, ctxt->elem,
"Failed to compile predicate\n");
if (ctxt->style != NULL)
ctxt->style->errors++;
}
}
comp->nbStep++;
return (0);
}
/**
* xsltSwapTopCompMatch:
* @comp: the compiled match expression
*
* reverse the two top steps.
*/
static void
xsltSwapTopCompMatch(xsltCompMatchPtr comp) {
int i;
int j = comp->nbStep - 1;
if (j > 0) {
register xmlChar *tmp;
register xsltOp op;
register xmlXPathCompExprPtr expr;
register int t;
i = j - 1;
tmp = comp->steps[i].value;
comp->steps[i].value = comp->steps[j].value;
comp->steps[j].value = tmp;
tmp = comp->steps[i].value2;
comp->steps[i].value2 = comp->steps[j].value2;
comp->steps[j].value2 = tmp;
tmp = comp->steps[i].value3;
comp->steps[i].value3 = comp->steps[j].value3;
comp->steps[j].value3 = tmp;
op = comp->steps[i].op;
comp->steps[i].op = comp->steps[j].op;
comp->steps[j].op = op;
expr = comp->steps[i].comp;
comp->steps[i].comp = comp->steps[j].comp;
comp->steps[j].comp = expr;
t = comp->steps[i].previousExtra;
comp->steps[i].previousExtra = comp->steps[j].previousExtra;
comp->steps[j].previousExtra = t;
t = comp->steps[i].indexExtra;
comp->steps[i].indexExtra = comp->steps[j].indexExtra;
comp->steps[j].indexExtra = t;
t = comp->steps[i].lenExtra;
comp->steps[i].lenExtra = comp->steps[j].lenExtra;
comp->steps[j].lenExtra = t;
}
}
/**
* xsltReverseCompMatch:
* @ctxt: the parser context
* @comp: the compiled match expression
*
* reverse all the stack of expressions
*/
static void
xsltReverseCompMatch(xsltParserContextPtr ctxt, xsltCompMatchPtr comp) {
int i = 0;
int j = comp->nbStep - 1;
while (j > i) {
register xmlChar *tmp;
register xsltOp op;
register xmlXPathCompExprPtr expr;
register int t;
tmp = comp->steps[i].value;
comp->steps[i].value = comp->steps[j].value;
comp->steps[j].value = tmp;
tmp = comp->steps[i].value2;
comp->steps[i].value2 = comp->steps[j].value2;
comp->steps[j].value2 = tmp;
tmp = comp->steps[i].value3;
comp->steps[i].value3 = comp->steps[j].value3;
comp->steps[j].value3 = tmp;
op = comp->steps[i].op;
comp->steps[i].op = comp->steps[j].op;
comp->steps[j].op = op;
expr = comp->steps[i].comp;
comp->steps[i].comp = comp->steps[j].comp;
comp->steps[j].comp = expr;
t = comp->steps[i].previousExtra;
comp->steps[i].previousExtra = comp->steps[j].previousExtra;
comp->steps[j].previousExtra = t;
t = comp->steps[i].indexExtra;
comp->steps[i].indexExtra = comp->steps[j].indexExtra;
comp->steps[j].indexExtra = t;
t = comp->steps[i].lenExtra;
comp->steps[i].lenExtra = comp->steps[j].lenExtra;
comp->steps[j].lenExtra = t;
j--;
i++;
}
xsltCompMatchAdd(ctxt, comp, XSLT_OP_END, NULL, NULL, 0);
/*
* Detect consecutive XSLT_OP_PREDICATE indicating a direct matching
* should be done.
*/
for (i = 0;i < comp->nbStep - 1;i++) {
if ((comp->steps[i].op == XSLT_OP_PREDICATE) &&
(comp->steps[i + 1].op == XSLT_OP_PREDICATE)) {
comp->direct = 1;
if (comp->pattern[0] != '/') {
xmlChar *query;
query = xmlStrdup((const xmlChar *)"//");
query = xmlStrcat(query, comp->pattern);
xmlFree((xmlChar *) comp->pattern);
comp->pattern = query;
}
break;
}
}
}
/************************************************************************
* *
* The interpreter for the precompiled patterns *
* *
************************************************************************/
static int
xsltPatPushState(xsltTransformContextPtr ctxt, xsltStepStates *states,
int step, xmlNodePtr node) {
if (states->maxstates <= states->nbstates) {
xsltStepState *tmp;
int newMax = states->maxstates == 0 ? 4 : 2 * states->maxstates;
tmp = (xsltStepStatePtr) xmlRealloc(states->states,
newMax * sizeof(xsltStepState));
if (tmp == NULL) {
xsltGenericError(xsltGenericErrorContext,
"xsltPatPushState: memory re-allocation failure.\n");
ctxt->state = XSLT_STATE_STOPPED;
return(-1);
}
states->states = tmp;
states->maxstates = newMax;
}
states->states[states->nbstates].step = step;
states->states[states->nbstates++].node = node;
#if 0
fprintf(stderr, "Push: %d, %s\n", step, node->name);
#endif
return(0);
}
static void
xmlXPathFreeObjectWrapper(void *obj) {
xmlXPathFreeObject((xmlXPathObjectPtr) obj);
}
/**
* xsltTestCompMatchDirect:
* @ctxt: a XSLT process context
* @comp: the precompiled pattern
* @node: a node
* @nsList: the namespaces in scope
* @nsNr: the number of namespaces in scope
*
* Test whether the node matches the pattern, do a direct evalutation
* and not a step by step evaluation.
*
* Returns 1 if it matches, 0 if it doesn't and -1 in case of failure
*/
static int
xsltTestCompMatchDirect(xsltTransformContextPtr ctxt, xsltCompMatchPtr comp,
xmlNodePtr node, xmlNsPtr *nsList, int nsNr) {
xsltStepOpPtr sel = NULL;
xmlDocPtr prevdoc;
xmlDocPtr doc;
xmlXPathObjectPtr list;
int ix, j;
int nocache = 0;
int isRVT;
doc = node->doc;
if (XSLT_IS_RES_TREE_FRAG(doc))
isRVT = 1;
else
isRVT = 0;
sel = &comp->steps[0]; /* store extra in first step arbitrarily */
prevdoc = (xmlDocPtr)
XSLT_RUNTIME_EXTRA(ctxt, sel->previousExtra, ptr);
ix = XSLT_RUNTIME_EXTRA(ctxt, sel->indexExtra, ival);
list = (xmlXPathObjectPtr)
XSLT_RUNTIME_EXTRA_LST(ctxt, sel->lenExtra);
if ((list == NULL) || (prevdoc != doc)) {
xmlXPathObjectPtr newlist;
xmlNodePtr parent = node->parent;
xmlDocPtr olddoc;
xmlNodePtr oldnode;
int oldNsNr, oldContextSize, oldProximityPosition;
xmlNsPtr *oldNamespaces;
oldnode = ctxt->xpathCtxt->node;
olddoc = ctxt->xpathCtxt->doc;
oldNsNr = ctxt->xpathCtxt->nsNr;
oldNamespaces = ctxt->xpathCtxt->namespaces;
oldContextSize = ctxt->xpathCtxt->contextSize;
oldProximityPosition = ctxt->xpathCtxt->proximityPosition;
ctxt->xpathCtxt->node = node;
ctxt->xpathCtxt->doc = doc;
ctxt->xpathCtxt->namespaces = nsList;
ctxt->xpathCtxt->nsNr = nsNr;
newlist = xmlXPathEval(comp->pattern, ctxt->xpathCtxt);
ctxt->xpathCtxt->node = oldnode;
ctxt->xpathCtxt->doc = olddoc;
ctxt->xpathCtxt->namespaces = oldNamespaces;
ctxt->xpathCtxt->nsNr = oldNsNr;
ctxt->xpathCtxt->contextSize = oldContextSize;
ctxt->xpathCtxt->proximityPosition = oldProximityPosition;
if (newlist == NULL)
return(-1);
if (newlist->type != XPATH_NODESET) {
xmlXPathFreeObject(newlist);
return(-1);
}
ix = 0;
if ((parent == NULL) || (node->doc == NULL) || isRVT)
nocache = 1;
if (nocache == 0) {
if (list != NULL)
xmlXPathFreeObject(list);
list = newlist;
XSLT_RUNTIME_EXTRA_LST(ctxt, sel->lenExtra) =
(void *) list;
XSLT_RUNTIME_EXTRA(ctxt, sel->previousExtra, ptr) =
(void *) doc;
XSLT_RUNTIME_EXTRA(ctxt, sel->indexExtra, ival) =
0;
XSLT_RUNTIME_EXTRA_FREE(ctxt, sel->lenExtra) =
xmlXPathFreeObjectWrapper;
} else
list = newlist;
}
if ((list->nodesetval == NULL) ||
(list->nodesetval->nodeNr <= 0)) {
if (nocache == 1)
xmlXPathFreeObject(list);
return(0);
}
/* TODO: store the index and use it for the scan */
if (ix == 0) {
for (j = 0;j < list->nodesetval->nodeNr;j++) {
if (list->nodesetval->nodeTab[j] == node) {
if (nocache == 1)
xmlXPathFreeObject(list);
return(1);
}
}
} else {
}
if (nocache == 1)
xmlXPathFreeObject(list);
return(0);
}
/**
* xsltTestStepMatch:
* @ctxt: a XSLT process context
* @node: a node
* @step: the step
*
* Test whether the node matches the step.
*
* Returns 1 if it matches, 0 if it doesn't and -1 in case of failure
*/
static int
xsltTestStepMatch(xsltTransformContextPtr ctxt, xmlNodePtr node,
xsltStepOpPtr step) {
switch (step->op) {
case XSLT_OP_ROOT:
if ((node->type == XML_DOCUMENT_NODE) ||
#ifdef LIBXML_DOCB_ENABLED
(node->type == XML_DOCB_DOCUMENT_NODE) ||
#endif
(node->type == XML_HTML_DOCUMENT_NODE))
return(1);
if ((node->type == XML_ELEMENT_NODE) && (node->name[0] == ' '))
return(1);
return(0);
case XSLT_OP_ELEM:
if (node->type != XML_ELEMENT_NODE)
return(0);
if (step->value == NULL)
return(1);
if (step->value[0] != node->name[0])
return(0);
if (!xmlStrEqual(step->value, node->name))
return(0);
/* Namespace test */
if (node->ns == NULL) {
if (step->value2 != NULL)
return(0);
} else if (node->ns->href != NULL) {
if (step->value2 == NULL)
return(0);
if (!xmlStrEqual(step->value2, node->ns->href))
return(0);
}
return(1);
case XSLT_OP_ATTR:
if (node->type != XML_ATTRIBUTE_NODE)
return(0);
if (step->value != NULL) {
if (step->value[0] != node->name[0])
return(0);
if (!xmlStrEqual(step->value, node->name))
return(0);
}
/* Namespace test */
if (node->ns == NULL) {
if (step->value2 != NULL)
return(0);
} else if (step->value2 != NULL) {
if (!xmlStrEqual(step->value2, node->ns->href))
return(0);
}
return(1);
case XSLT_OP_ID: {
/* TODO Handle IDs decently, must be done differently */
xmlAttrPtr id;
if (node->type != XML_ELEMENT_NODE)
return(0);
id = xmlGetID(node->doc, step->value);
if ((id == NULL) || (id->parent != node))
return(0);
break;
}
case XSLT_OP_KEY: {
xmlNodeSetPtr list;
int indx;
list = xsltGetKey(ctxt, step->value,
step->value3, step->value2);
if (list == NULL)
return(0);
for (indx = 0;indx < list->nodeNr;indx++)
if (list->nodeTab[indx] == node)
break;
if (indx >= list->nodeNr)
return(0);
break;
}
case XSLT_OP_NS:
if (node->type != XML_ELEMENT_NODE)
return(0);
if (node->ns == NULL) {
if (step->value != NULL)
return(0);
} else if (node->ns->href != NULL) {
if (step->value == NULL)
return(0);
if (!xmlStrEqual(step->value, node->ns->href))
return(0);
}
break;
case XSLT_OP_ALL:
if (node->type != XML_ELEMENT_NODE)
return(0);
break;
case XSLT_OP_PI:
if (node->type != XML_PI_NODE)
return(0);
if (step->value != NULL) {
if (!xmlStrEqual(step->value, node->name))
return(0);
}
break;
case XSLT_OP_COMMENT:
if (node->type != XML_COMMENT_NODE)
return(0);
break;
case XSLT_OP_TEXT:
if ((node->type != XML_TEXT_NODE) &&
(node->type != XML_CDATA_SECTION_NODE))
return(0);
break;
case XSLT_OP_NODE:
switch (node->type) {
case XML_ELEMENT_NODE:
case XML_CDATA_SECTION_NODE:
case XML_PI_NODE:
case XML_COMMENT_NODE:
case XML_TEXT_NODE:
break;
default:
return(0);
}
break;
default:
xsltTransformError(ctxt, NULL, node,
"xsltTestStepMatch: unexpected step op %d\n",
step->op);
return(-1);
}
return(1);
}
/**
* xsltTestPredicateMatch:
* @ctxt: a XSLT process context
* @comp: the precompiled pattern
* @node: a node
* @step: the predicate step
* @sel: the previous step
*
* Test whether the node matches the predicate
*
* Returns 1 if it matches, 0 if it doesn't and -1 in case of failure
*/
static int
xsltTestPredicateMatch(xsltTransformContextPtr ctxt, xsltCompMatchPtr comp,
xmlNodePtr node, xsltStepOpPtr step,
xsltStepOpPtr sel) {
xmlNodePtr oldNode;
xmlDocPtr doc;
int oldCS, oldCP;
int pos = 0, len = 0;
int isRVT;
int match;
if (step->value == NULL)
return(0);
if (step->comp == NULL)
return(0);
if (sel == NULL)
return(0);
doc = node->doc;
if (XSLT_IS_RES_TREE_FRAG(doc))
isRVT = 1;
else
isRVT = 0;
/*
* Recompute contextSize and proximityPosition.
*
* This could be improved in the following ways:
*
* - Skip recomputation if predicates don't use position() or last()
* - Keep data for multiple parents. This would require a hash table
* or an unused member in xmlNode.
* - Store node test results in a bitmap to avoid computing them twice.
*/
oldCS = ctxt->xpathCtxt->contextSize;
oldCP = ctxt->xpathCtxt->proximityPosition;
{
xmlNodePtr previous;
int nocache = 0;
previous = (xmlNodePtr)
XSLT_RUNTIME_EXTRA(ctxt, sel->previousExtra, ptr);
if ((previous != NULL) &&
(previous->parent == node->parent)) {
/*
* just walk back to adjust the index
*/
int indx = 0;
xmlNodePtr sibling = node;
while (sibling != NULL) {
if (sibling == previous)
break;
if (xsltTestStepMatch(ctxt, sibling, sel))
indx++;
sibling = sibling->prev;
}
if (sibling == NULL) {
/* hum going backward in document order ... */
indx = 0;
sibling = node;
while (sibling != NULL) {
if (sibling == previous)
break;
if (xsltTestStepMatch(ctxt, sibling, sel))
indx--;
sibling = sibling->next;
}
}
if (sibling != NULL) {
pos = XSLT_RUNTIME_EXTRA(ctxt, sel->indexExtra, ival) + indx;
/*
* If the node is in a Value Tree we need to
* save len, but cannot cache the node!
* (bugs 153137 and 158840)
*/
if (node->doc != NULL) {
len = XSLT_RUNTIME_EXTRA(ctxt, sel->lenExtra, ival);
if (!isRVT) {
XSLT_RUNTIME_EXTRA(ctxt,
sel->previousExtra, ptr) = node;
XSLT_RUNTIME_EXTRA(ctxt, sel->indexExtra, ival) = pos;
}
}
} else
pos = 0;
} else {
/*
* recompute the index
*/
xmlNodePtr parent = node->parent;
xmlNodePtr siblings = NULL;
if (parent) siblings = parent->children;
while (siblings != NULL) {
if (siblings == node) {
len++;
pos = len;
} else if (xsltTestStepMatch(ctxt, siblings, sel)) {
len++;
}
siblings = siblings->next;
}
if ((parent == NULL) || (node->doc == NULL))
nocache = 1;
else {
while (parent->parent != NULL)
parent = parent->parent;
if (((parent->type != XML_DOCUMENT_NODE) &&
(parent->type != XML_HTML_DOCUMENT_NODE)) ||
(parent != (xmlNodePtr) node->doc))
nocache = 1;
}
}
if (pos != 0) {
ctxt->xpathCtxt->contextSize = len;
ctxt->xpathCtxt->proximityPosition = pos;
/*
* If the node is in a Value Tree we cannot
* cache it !
*/
if ((!isRVT) && (node->doc != NULL) &&
(nocache == 0)) {
XSLT_RUNTIME_EXTRA(ctxt, sel->previousExtra, ptr) = node;
XSLT_RUNTIME_EXTRA(ctxt, sel->indexExtra, ival) = pos;
XSLT_RUNTIME_EXTRA(ctxt, sel->lenExtra, ival) = len;
}
}
}
oldNode = ctxt->node;
ctxt->node = node;
match = xsltEvalXPathPredicate(ctxt, step->comp, comp->nsList, comp->nsNr);
if (pos != 0) {
ctxt->xpathCtxt->contextSize = oldCS;
ctxt->xpathCtxt->proximityPosition = oldCP;
}
ctxt->node = oldNode;
return match;
}
/**
* xsltTestCompMatch:
* @ctxt: a XSLT process context
* @comp: the precompiled pattern
* @node: a node
* @mode: the mode name or NULL
* @modeURI: the mode URI or NULL
*
* Test whether the node matches the pattern
*
* Returns 1 if it matches, 0 if it doesn't and -1 in case of failure
*/
static int
xsltTestCompMatch(xsltTransformContextPtr ctxt, xsltCompMatchPtr comp,
xmlNodePtr matchNode, const xmlChar *mode,
const xmlChar *modeURI) {
int i;
int found = 0;
xmlNodePtr node = matchNode;
xmlNodePtr oldInst;
xsltStepOpPtr step, sel = NULL;
xsltStepStates states = {0, 0, NULL}; /* // may require backtrack */
if ((comp == NULL) || (node == NULL) || (ctxt == NULL)) {
xsltTransformError(ctxt, NULL, node,
"xsltTestCompMatch: null arg\n");
return(-1);
}
if (mode != NULL) {
if (comp->mode == NULL)
return(0);
/*
* both mode strings must be interned on the stylesheet dictionary
*/
if (comp->mode != mode)
return(0);
} else {
if (comp->mode != NULL)
return(0);
}
if (modeURI != NULL) {
if (comp->modeURI == NULL)
return(0);
/*
* both modeURI strings must be interned on the stylesheet dictionary
*/
if (comp->modeURI != modeURI)
return(0);
} else {
if (comp->modeURI != NULL)
return(0);
}
/* Some XPath functions rely on inst being set correctly. */
oldInst = ctxt->inst;
ctxt->inst = comp->node;
i = 0;
restart:
for (;i < comp->nbStep;i++) {
step = &comp->steps[i];
if (step->op != XSLT_OP_PREDICATE)
sel = step;
switch (step->op) {
case XSLT_OP_END:
goto found;
case XSLT_OP_PARENT:
if ((node->type == XML_DOCUMENT_NODE) ||
(node->type == XML_HTML_DOCUMENT_NODE) ||
#ifdef LIBXML_DOCB_ENABLED
(node->type == XML_DOCB_DOCUMENT_NODE) ||
#endif
(node->type == XML_NAMESPACE_DECL))
goto rollback;
node = node->parent;
if (node == NULL)
goto rollback;
if (step->value == NULL)
continue;
if (step->value[0] != node->name[0])
goto rollback;
if (!xmlStrEqual(step->value, node->name))
goto rollback;
/* Namespace test */
if (node->ns == NULL) {
if (step->value2 != NULL)
goto rollback;
} else if (node->ns->href != NULL) {
if (step->value2 == NULL)
goto rollback;
if (!xmlStrEqual(step->value2, node->ns->href))
goto rollback;
}
continue;
case XSLT_OP_ANCESTOR:
/* TODO: implement coalescing of ANCESTOR/NODE ops */
if (step->value == NULL) {
step = &comp->steps[i+1];
if (step->op == XSLT_OP_ROOT)
goto found;
/* added NS, ID and KEY as a result of bug 168208 */
if ((step->op != XSLT_OP_ELEM) &&
(step->op != XSLT_OP_ALL) &&
(step->op != XSLT_OP_NS) &&
(step->op != XSLT_OP_ID) &&
(step->op != XSLT_OP_KEY))
goto rollback;
}
if (node == NULL)
goto rollback;
if ((node->type == XML_DOCUMENT_NODE) ||
(node->type == XML_HTML_DOCUMENT_NODE) ||
#ifdef LIBXML_DOCB_ENABLED
(node->type == XML_DOCB_DOCUMENT_NODE) ||
#endif
(node->type == XML_NAMESPACE_DECL))
goto rollback;
node = node->parent;
if ((step->op != XSLT_OP_ELEM) && step->op != XSLT_OP_ALL) {
xsltPatPushState(ctxt, &states, i, node);
continue;
}
i++;
sel = step;
if (step->value == NULL) {
xsltPatPushState(ctxt, &states, i - 1, node);
continue;
}
while (node != NULL) {
if ((node->type == XML_ELEMENT_NODE) &&
(step->value[0] == node->name[0]) &&
(xmlStrEqual(step->value, node->name))) {
/* Namespace test */
if (node->ns == NULL) {
if (step->value2 == NULL)
break;
} else if (node->ns->href != NULL) {
if ((step->value2 != NULL) &&
(xmlStrEqual(step->value2, node->ns->href)))
break;
}
}
node = node->parent;
}
if (node == NULL)
goto rollback;
xsltPatPushState(ctxt, &states, i - 1, node);
continue;
case XSLT_OP_PREDICATE: {
/*
* When there is cascading XSLT_OP_PREDICATE or a predicate
* after an op which hasn't been optimized yet, then use a
* direct computation approach. It's not done directly
* at the beginning of the routine to filter out as much
* as possible this costly computation.
*/
if (comp->direct) {
found = xsltTestCompMatchDirect(ctxt, comp, matchNode,
comp->nsList, comp->nsNr);
goto exit;
}
if (!xsltTestPredicateMatch(ctxt, comp, node, step, sel))
goto rollback;
break;
}
default:
if (xsltTestStepMatch(ctxt, node, step) != 1)
goto rollback;
break;
}
}
found:
found = 1;
exit:
ctxt->inst = oldInst;
if (states.states != NULL) {
/* Free the rollback states */
xmlFree(states.states);
}
return found;
rollback:
/* got an error try to rollback */
if (states.states == NULL || states.nbstates <= 0) {
found = 0;
goto exit;
}
states.nbstates--;
i = states.states[states.nbstates].step;
node = states.states[states.nbstates].node;
#if 0
fprintf(stderr, "Pop: %d, %s\n", i, node->name);
#endif
goto restart;
}
/**
* xsltTestCompMatchList:
* @ctxt: a XSLT process context
* @node: a node
* @comp: the precompiled pattern list
*
* Test whether the node matches one of the patterns in the list
*
* Returns 1 if it matches, 0 if it doesn't and -1 in case of failure
*/
int
xsltTestCompMatchList(xsltTransformContextPtr ctxt, xmlNodePtr node,
xsltCompMatchPtr comp) {
int ret;
if ((ctxt == NULL) || (node == NULL))
return(-1);
while (comp != NULL) {
ret = xsltTestCompMatch(ctxt, comp, node, NULL, NULL);
if (ret == 1)
return(1);
comp = comp->next;
}
return(0);
}
/**
* xsltCompMatchClearCache:
* @ctxt: a XSLT process context
* @comp: the precompiled pattern list
*
* Clear pattern match cache.
*/
void
xsltCompMatchClearCache(xsltTransformContextPtr ctxt, xsltCompMatchPtr comp) {
xsltStepOpPtr sel;
xmlXPathObjectPtr list;
if ((ctxt == NULL) || (comp == NULL))
return;
sel = &comp->steps[0];
list = (xmlXPathObjectPtr) XSLT_RUNTIME_EXTRA_LST(ctxt, sel->lenExtra);
if (list != NULL) {
xmlXPathFreeObject(list);
XSLT_RUNTIME_EXTRA_LST(ctxt, sel->lenExtra) = NULL;
XSLT_RUNTIME_EXTRA(ctxt, sel->previousExtra, ptr) = NULL;
XSLT_RUNTIME_EXTRA(ctxt, sel->indexExtra, ival) = 0;
XSLT_RUNTIME_EXTRA_FREE(ctxt, sel->lenExtra) = NULL;
}
}
/************************************************************************
* *
* Dedicated parser for templates *
* *
************************************************************************/
#define CUR (*ctxt->cur)
#define SKIP(val) ctxt->cur += (val)
#define NXT(val) ctxt->cur[(val)]
#define CUR_PTR ctxt->cur
#define SKIP_BLANKS \
while (xmlIsBlank_ch(CUR)) NEXT
#define CURRENT (*ctxt->cur)
#define NEXT ((*ctxt->cur) ? ctxt->cur++: ctxt->cur)
#define PUSH(op, val, val2, novar) \
if (xsltCompMatchAdd(ctxt, ctxt->comp, (op), (val), (val2), (novar))) goto error;
#define SWAP() \
xsltSwapTopCompMatch(ctxt->comp);
#define XSLT_ERROR(X) \
{ xsltError(ctxt, __FILE__, __LINE__, X); \
ctxt->error = (X); return; }
#define XSLT_ERROR0(X) \
{ xsltError(ctxt, __FILE__, __LINE__, X); \
ctxt->error = (X); return(0); }
/**
* xsltScanLiteral:
* @ctxt: the XPath Parser context
*
* Parse an XPath Litteral:
*
* [29] Literal ::= '"' [^"]* '"'
* | "'" [^']* "'"
*
* Returns the Literal parsed or NULL
*/
static xmlChar *
xsltScanLiteral(xsltParserContextPtr ctxt) {
const xmlChar *q, *cur;
xmlChar *ret = NULL;
int val, len;
SKIP_BLANKS;
if (CUR == '"') {
NEXT;
cur = q = CUR_PTR;
val = xsltGetUTF8CharZ(cur, &len);
while ((xmlIsCharQ(val)) && (val != '"')) {
cur += len;
val = xsltGetUTF8CharZ(cur, &len);
}
if (!xmlIsCharQ(val)) {
ctxt->error = 1;
return(NULL);
} else {
ret = xmlStrndup(q, cur - q);
}
cur += len;
CUR_PTR = cur;
} else if (CUR == '\'') {
NEXT;
cur = q = CUR_PTR;
val = xsltGetUTF8CharZ(cur, &len);
while ((xmlIsCharQ(val)) && (val != '\'')) {
cur += len;
val = xsltGetUTF8CharZ(cur, &len);
}
if (!xmlIsCharQ(val)) {
ctxt->error = 1;
return(NULL);
} else {
ret = xmlStrndup(q, cur - q);
}
cur += len;
CUR_PTR = cur;
} else {
ctxt->error = 1;
return(NULL);
}
return(ret);
}
/**
* xsltScanNCName:
* @ctxt: the XPath Parser context
*
* Parses a non qualified name
*
* Returns the Name parsed or NULL
*/
static xmlChar *
xsltScanNCName(xsltParserContextPtr ctxt) {
const xmlChar *q, *cur;
xmlChar *ret = NULL;
int val, len;
SKIP_BLANKS;
cur = q = CUR_PTR;
val = xsltGetUTF8CharZ(cur, &len);
if (!xmlIsBaseCharQ(val) && !xmlIsIdeographicQ(val) && (val != '_'))
return(NULL);
while (xmlIsBaseCharQ(val) || xmlIsIdeographicQ(val) ||
xmlIsDigitQ(val) ||
(val == '.') || (val == '-') ||
(val == '_') ||
xmlIsCombiningQ(val) ||
xmlIsExtenderQ(val)) {
cur += len;
val = xsltGetUTF8CharZ(cur, &len);
}
ret = xmlStrndup(q, cur - q);
CUR_PTR = cur;
return(ret);
}
/*
* xsltCompileIdKeyPattern:
* @ctxt: the compilation context
* @name: a preparsed name
* @aid: whether id/key are allowed there
* @novar: flag to prohibit xslt var
*
* Compile the XSLT LocationIdKeyPattern
* [3] IdKeyPattern ::= 'id' '(' Literal ')'
* | 'key' '(' Literal ',' Literal ')'
*
* also handle NodeType and PI from:
*
* [7] NodeTest ::= NameTest
* | NodeType '(' ')'
* | 'processing-instruction' '(' Literal ')'
*/
static void
xsltCompileIdKeyPattern(xsltParserContextPtr ctxt, xmlChar *name,
int aid, int novar, xsltAxis axis) {
xmlChar *lit = NULL;
xmlChar *lit2 = NULL;
if (CUR != '(') {
xsltTransformError(NULL, NULL, NULL,
"xsltCompileIdKeyPattern : ( expected\n");
ctxt->error = 1;
return;
}
if ((aid) && (xmlStrEqual(name, (const xmlChar *)"id"))) {
if (axis != 0) {
xsltTransformError(NULL, NULL, NULL,
"xsltCompileIdKeyPattern : NodeTest expected\n");
ctxt->error = 1;
return;
}
NEXT;
SKIP_BLANKS;
lit = xsltScanLiteral(ctxt);
if (ctxt->error) {
xsltTransformError(NULL, NULL, NULL,
"xsltCompileIdKeyPattern : Literal expected\n");
xmlFree(lit);
return;
}
SKIP_BLANKS;
if (CUR != ')') {
xsltTransformError(NULL, NULL, NULL,
"xsltCompileIdKeyPattern : ) expected\n");
xmlFree(lit);
ctxt->error = 1;
return;
}
NEXT;
PUSH(XSLT_OP_ID, lit, NULL, novar);
lit = NULL;
} else if ((aid) && (xmlStrEqual(name, (const xmlChar *)"key"))) {
if (axis != 0) {
xsltTransformError(NULL, NULL, NULL,
"xsltCompileIdKeyPattern : NodeTest expected\n");
ctxt->error = 1;
return;
}
NEXT;
SKIP_BLANKS;
lit = xsltScanLiteral(ctxt);
if (ctxt->error) {
xsltTransformError(NULL, NULL, NULL,
"xsltCompileIdKeyPattern : Literal expected\n");
xmlFree(lit);
return;
}
SKIP_BLANKS;
if (CUR != ',') {
xsltTransformError(NULL, NULL, NULL,
"xsltCompileIdKeyPattern : , expected\n");
xmlFree(lit);
ctxt->error = 1;
return;
}
NEXT;
SKIP_BLANKS;
lit2 = xsltScanLiteral(ctxt);
if (ctxt->error) {
xsltTransformError(NULL, NULL, NULL,
"xsltCompileIdKeyPattern : Literal expected\n");
xmlFree(lit);
return;
}
SKIP_BLANKS;
if (CUR != ')') {
xsltTransformError(NULL, NULL, NULL,
"xsltCompileIdKeyPattern : ) expected\n");
xmlFree(lit);
xmlFree(lit2);
ctxt->error = 1;
return;
}
NEXT;
/* URGENT TODO: support namespace in keys */
PUSH(XSLT_OP_KEY, lit, lit2, novar);
lit = NULL;
lit2 = NULL;
} else if (xmlStrEqual(name, (const xmlChar *)"processing-instruction")) {
NEXT;
SKIP_BLANKS;
if (CUR != ')') {
lit = xsltScanLiteral(ctxt);
if (ctxt->error) {
xsltTransformError(NULL, NULL, NULL,
"xsltCompileIdKeyPattern : Literal expected\n");
xmlFree(lit);
return;
}
SKIP_BLANKS;
if (CUR != ')') {
xsltTransformError(NULL, NULL, NULL,
"xsltCompileIdKeyPattern : ) expected\n");
ctxt->error = 1;
xmlFree(lit);
return;
}
}
NEXT;
PUSH(XSLT_OP_PI, lit, NULL, novar);
lit = NULL;
} else if (xmlStrEqual(name, (const xmlChar *)"text")) {
NEXT;
SKIP_BLANKS;
if (CUR != ')') {
xsltTransformError(NULL, NULL, NULL,
"xsltCompileIdKeyPattern : ) expected\n");
ctxt->error = 1;
return;
}
NEXT;
PUSH(XSLT_OP_TEXT, NULL, NULL, novar);
} else if (xmlStrEqual(name, (const xmlChar *)"comment")) {
NEXT;
SKIP_BLANKS;
if (CUR != ')') {
xsltTransformError(NULL, NULL, NULL,
"xsltCompileIdKeyPattern : ) expected\n");
ctxt->error = 1;
return;
}
NEXT;
PUSH(XSLT_OP_COMMENT, NULL, NULL, novar);
} else if (xmlStrEqual(name, (const xmlChar *)"node")) {
NEXT;
SKIP_BLANKS;
if (CUR != ')') {
xsltTransformError(NULL, NULL, NULL,
"xsltCompileIdKeyPattern : ) expected\n");
ctxt->error = 1;
return;
}
NEXT;
if (axis == AXIS_ATTRIBUTE) {
PUSH(XSLT_OP_ATTR, NULL, NULL, novar);
}
else {
PUSH(XSLT_OP_NODE, NULL, NULL, novar);
}
} else if (aid) {
xsltTransformError(NULL, NULL, NULL,
"xsltCompileIdKeyPattern : expecting 'key' or 'id' or node type\n");
ctxt->error = 1;
return;
} else {
xsltTransformError(NULL, NULL, NULL,
"xsltCompileIdKeyPattern : node type\n");
ctxt->error = 1;
return;
}
error:
return;
}
/**
* xsltCompileStepPattern:
* @ctxt: the compilation context
* @token: a posible precompiled name
* @novar: flag to prohibit xslt variables from pattern
*
* Compile the XSLT StepPattern and generates a precompiled
* form suitable for fast matching.
*
* [5] StepPattern ::= ChildOrAttributeAxisSpecifier NodeTest Predicate*
* [6] ChildOrAttributeAxisSpecifier ::= AbbreviatedAxisSpecifier
* | ('child' | 'attribute') '::'
* from XPath
* [7] NodeTest ::= NameTest
* | NodeType '(' ')'
* | 'processing-instruction' '(' Literal ')'
* [8] Predicate ::= '[' PredicateExpr ']'
* [9] PredicateExpr ::= Expr
* [13] AbbreviatedAxisSpecifier ::= '@'?
* [37] NameTest ::= '*' | NCName ':' '*' | QName
*/
static void
xsltCompileStepPattern(xsltParserContextPtr ctxt, xmlChar *token, int novar) {
xmlChar *name = NULL;
const xmlChar *URI = NULL;
xmlChar *URL = NULL;
xmlChar *ret = NULL;
int level;
xsltAxis axis = 0;
SKIP_BLANKS;
if ((token == NULL) && (CUR == '@')) {
NEXT;
axis = AXIS_ATTRIBUTE;
}
parse_node_test:
if (token == NULL)
token = xsltScanNCName(ctxt);
if (token == NULL) {
if (CUR == '*') {
NEXT;
if (axis == AXIS_ATTRIBUTE) {
PUSH(XSLT_OP_ATTR, NULL, NULL, novar);
}
else {
PUSH(XSLT_OP_ALL, NULL, NULL, novar);
}
goto parse_predicate;
} else {
xsltTransformError(NULL, NULL, NULL,
"xsltCompileStepPattern : Name expected\n");
ctxt->error = 1;
goto error;
}
}
SKIP_BLANKS;
if (CUR == '(') {
xsltCompileIdKeyPattern(ctxt, token, 0, novar, axis);
xmlFree(token);
token = NULL;
if (ctxt->error)
goto error;
} else if (CUR == ':') {
NEXT;
if (CUR != ':') {
xmlChar *prefix = token;
xmlNsPtr ns;
/*
* This is a namespace match
*/
token = xsltScanNCName(ctxt);
ns = xmlSearchNs(ctxt->doc, ctxt->elem, prefix);
if (ns == NULL) {
xsltTransformError(NULL, NULL, NULL,
"xsltCompileStepPattern : no namespace bound to prefix %s\n",
prefix);
xmlFree(prefix);
prefix=NULL;
ctxt->error = 1;
goto error;
} else {
URL = xmlStrdup(ns->href);
}
xmlFree(prefix);
prefix=NULL;
if (token == NULL) {
if (CUR == '*') {
NEXT;
if (axis == AXIS_ATTRIBUTE) {
PUSH(XSLT_OP_ATTR, NULL, URL, novar);
URL = NULL;
}
else {
PUSH(XSLT_OP_NS, URL, NULL, novar);
URL = NULL;
}
} else {
xsltTransformError(NULL, NULL, NULL,
"xsltCompileStepPattern : Name expected\n");
ctxt->error = 1;
goto error;
}
} else {
if (axis == AXIS_ATTRIBUTE) {
PUSH(XSLT_OP_ATTR, token, URL, novar);
token = NULL;
URL = NULL;
}
else {
PUSH(XSLT_OP_ELEM, token, URL, novar);
token = NULL;
URL = NULL;
}
}
} else {
if (axis != 0) {
xsltTransformError(NULL, NULL, NULL,
"xsltCompileStepPattern : NodeTest expected\n");
ctxt->error = 1;
goto error;
}
NEXT;
if (xmlStrEqual(token, (const xmlChar *) "child")) {
axis = AXIS_CHILD;
} else if (xmlStrEqual(token, (const xmlChar *) "attribute")) {
axis = AXIS_ATTRIBUTE;
} else {
xsltTransformError(NULL, NULL, NULL,
"xsltCompileStepPattern : 'child' or 'attribute' expected\n");
ctxt->error = 1;
goto error;
}
xmlFree(token);
token = NULL;
SKIP_BLANKS;
token = xsltScanNCName(ctxt);
goto parse_node_test;
}
} else {
URI = xsltGetQNameURI(ctxt->elem, &token);
if (token == NULL) {
ctxt->error = 1;
goto error;
}
if (URI != NULL)
URL = xmlStrdup(URI);
if (axis == AXIS_ATTRIBUTE) {
PUSH(XSLT_OP_ATTR, token, URL, novar);
token = NULL;
URL = NULL;
}
else {
PUSH(XSLT_OP_ELEM, token, URL, novar);
token = NULL;
URL = NULL;
}
}
parse_predicate:
SKIP_BLANKS;
level = 0;
while (CUR == '[') {
const xmlChar *q;
level++;
NEXT;
q = CUR_PTR;
while (CUR != 0) {
/* Skip over nested predicates */
if (CUR == '[')
level++;
else if (CUR == ']') {
level--;
if (level == 0)
break;
} else if (CUR == '"') {
NEXT;
while ((CUR != 0) && (CUR != '"'))
NEXT;
} else if (CUR == '\'') {
NEXT;
while ((CUR != 0) && (CUR != '\''))
NEXT;
}
NEXT;
}
if (CUR == 0) {
xsltTransformError(NULL, NULL, NULL,
"xsltCompileStepPattern : ']' expected\n");
ctxt->error = 1;
return;
}
ret = xmlStrndup(q, CUR_PTR - q);
PUSH(XSLT_OP_PREDICATE, ret, NULL, novar);
ret = NULL;
/* push the predicate lower than local test */
SWAP();
NEXT;
SKIP_BLANKS;
}
return;
error:
if (token != NULL)
xmlFree(token);
if (name != NULL)
xmlFree(name);
if (URL != NULL)
xmlFree(URL);
if (ret != NULL)
xmlFree(ret);
}
/**
* xsltCompileRelativePathPattern:
* @comp: the compilation context
* @token: a posible precompiled name
* @novar: flag to prohibit xslt variables
*
* Compile the XSLT RelativePathPattern and generates a precompiled
* form suitable for fast matching.
*
* [4] RelativePathPattern ::= StepPattern
* | RelativePathPattern '/' StepPattern
* | RelativePathPattern '//' StepPattern
*/
static void
xsltCompileRelativePathPattern(xsltParserContextPtr ctxt, xmlChar *token, int novar) {
xsltCompileStepPattern(ctxt, token, novar);
if (ctxt->error)
goto error;
SKIP_BLANKS;
while ((CUR != 0) && (CUR != '|')) {
if ((CUR == '/') && (NXT(1) == '/')) {
PUSH(XSLT_OP_ANCESTOR, NULL, NULL, novar);
NEXT;
NEXT;
SKIP_BLANKS;
xsltCompileStepPattern(ctxt, NULL, novar);
} else if (CUR == '/') {
PUSH(XSLT_OP_PARENT, NULL, NULL, novar);
NEXT;
SKIP_BLANKS;
xsltCompileStepPattern(ctxt, NULL, novar);
} else {
ctxt->error = 1;
}
if (ctxt->error)
goto error;
SKIP_BLANKS;
}
error:
return;
}
/**
* xsltCompileLocationPathPattern:
* @ctxt: the compilation context
* @novar: flag to prohibit xslt variables
*
* Compile the XSLT LocationPathPattern and generates a precompiled
* form suitable for fast matching.
*
* [2] LocationPathPattern ::= '/' RelativePathPattern?
* | IdKeyPattern (('/' | '//') RelativePathPattern)?
* | '//'? RelativePathPattern
*/
static void
xsltCompileLocationPathPattern(xsltParserContextPtr ctxt, int novar) {
SKIP_BLANKS;
if ((CUR == '/') && (NXT(1) == '/')) {
/*
* since we reverse the query
* a leading // can be safely ignored
*/
NEXT;
NEXT;
ctxt->comp->priority = 0.5; /* '//' means not 0 priority */
xsltCompileRelativePathPattern(ctxt, NULL, novar);
} else if (CUR == '/') {
/*
* We need to find root as the parent
*/
NEXT;
SKIP_BLANKS;
PUSH(XSLT_OP_ROOT, NULL, NULL, novar);
if ((CUR != 0) && (CUR != '|')) {
PUSH(XSLT_OP_PARENT, NULL, NULL, novar);
xsltCompileRelativePathPattern(ctxt, NULL, novar);
}
} else if (CUR == '*') {
xsltCompileRelativePathPattern(ctxt, NULL, novar);
} else if (CUR == '@') {
xsltCompileRelativePathPattern(ctxt, NULL, novar);
} else {
xmlChar *name;
name = xsltScanNCName(ctxt);
if (name == NULL) {
xsltTransformError(NULL, NULL, NULL,
"xsltCompileLocationPathPattern : Name expected\n");
ctxt->error = 1;
return;
}
SKIP_BLANKS;
if ((CUR == '(') && !xmlXPathIsNodeType(name)) {
xsltCompileIdKeyPattern(ctxt, name, 1, novar, 0);
xmlFree(name);
name = NULL;
if (ctxt->error)
return;
if ((CUR == '/') && (NXT(1) == '/')) {
PUSH(XSLT_OP_ANCESTOR, NULL, NULL, novar);
NEXT;
NEXT;
SKIP_BLANKS;
xsltCompileRelativePathPattern(ctxt, NULL, novar);
} else if (CUR == '/') {
PUSH(XSLT_OP_PARENT, NULL, NULL, novar);
NEXT;
SKIP_BLANKS;
xsltCompileRelativePathPattern(ctxt, NULL, novar);
}
return;
}
xsltCompileRelativePathPattern(ctxt, name, novar);
}
error:
return;
}
/**
* xsltCompilePatternInternal:
* @pattern: an XSLT pattern
* @doc: the containing document
* @node: the containing element
* @style: the stylesheet
* @runtime: the transformation context, if done at run-time
* @novar: flag to prohibit xslt variables
*
* Compile the XSLT pattern and generates a list of precompiled form suitable
* for fast matching.
*
* [1] Pattern ::= LocationPathPattern | Pattern '|' LocationPathPattern
*
* Returns the generated pattern list or NULL in case of failure
*/
static xsltCompMatchPtr
xsltCompilePatternInternal(const xmlChar *pattern, xmlDocPtr doc,
xmlNodePtr node, xsltStylesheetPtr style,
xsltTransformContextPtr runtime, int novar) {
xsltParserContextPtr ctxt = NULL;
xsltCompMatchPtr element, first = NULL, previous = NULL;
int current, start, end, level, j;
if (pattern == NULL) {
xsltTransformError(NULL, NULL, node,
"xsltCompilePattern : NULL pattern\n");
return(NULL);
}
ctxt = xsltNewParserContext(style, runtime);
if (ctxt == NULL)
return(NULL);
ctxt->doc = doc;
ctxt->elem = node;
current = end = 0;
while (pattern[current] != 0) {
start = current;
while (xmlIsBlank_ch(pattern[current]))
current++;
end = current;
level = 0;
while ((pattern[end] != 0) && ((pattern[end] != '|') || (level != 0))) {
if (pattern[end] == '[')
level++;
else if (pattern[end] == ']')
level--;
else if (pattern[end] == '\'') {
end++;
while ((pattern[end] != 0) && (pattern[end] != '\''))
end++;
} else if (pattern[end] == '"') {
end++;
while ((pattern[end] != 0) && (pattern[end] != '"'))
end++;
}
if (pattern[end] == 0)
break;
end++;
}
if (current == end) {
xsltTransformError(NULL, NULL, node,
"xsltCompilePattern : NULL pattern\n");
goto error;
}
element = xsltNewCompMatch();
if (element == NULL) {
goto error;
}
if (first == NULL)
first = element;
else if (previous != NULL)
previous->next = element;
previous = element;
ctxt->comp = element;
ctxt->base = xmlStrndup(&pattern[start], end - start);
if (ctxt->base == NULL)
goto error;
ctxt->cur = &(ctxt->base)[current - start];
element->pattern = ctxt->base;
element->node = node;
element->nsList = xmlGetNsList(doc, node);
j = 0;
if (element->nsList != NULL) {
while (element->nsList[j] != NULL)
j++;
}
element->nsNr = j;
#ifdef WITH_XSLT_DEBUG_PATTERN
xsltGenericDebug(xsltGenericDebugContext,
"xsltCompilePattern : parsing '%s'\n",
element->pattern);
#endif
/*
Preset default priority to be zero.
This may be changed by xsltCompileLocationPathPattern.
*/
element->priority = 0;
xsltCompileLocationPathPattern(ctxt, novar);
if (ctxt->error) {
xsltTransformError(NULL, style, node,
"xsltCompilePattern : failed to compile '%s'\n",
element->pattern);
if (style != NULL) style->errors++;
goto error;
}
/*
* Reverse for faster interpretation.
*/
xsltReverseCompMatch(ctxt, element);
/*
* Set-up the priority
*/
if (element->priority == 0) { /* if not yet determined */
if (((element->steps[0].op == XSLT_OP_ELEM) ||
(element->steps[0].op == XSLT_OP_ATTR) ||
(element->steps[0].op == XSLT_OP_PI)) &&
(element->steps[0].value != NULL) &&
(element->steps[1].op == XSLT_OP_END)) {
; /* previously preset */
} else if ((element->steps[0].op == XSLT_OP_ATTR) &&
(element->steps[0].value2 != NULL) &&
(element->steps[1].op == XSLT_OP_END)) {
element->priority = -0.25;
} else if ((element->steps[0].op == XSLT_OP_NS) &&
(element->steps[0].value != NULL) &&
(element->steps[1].op == XSLT_OP_END)) {
element->priority = -0.25;
} else if ((element->steps[0].op == XSLT_OP_ATTR) &&
(element->steps[0].value == NULL) &&
(element->steps[0].value2 == NULL) &&
(element->steps[1].op == XSLT_OP_END)) {
element->priority = -0.5;
} else if (((element->steps[0].op == XSLT_OP_PI) ||
(element->steps[0].op == XSLT_OP_TEXT) ||
(element->steps[0].op == XSLT_OP_ALL) ||
(element->steps[0].op == XSLT_OP_NODE) ||
(element->steps[0].op == XSLT_OP_COMMENT)) &&
(element->steps[1].op == XSLT_OP_END)) {
element->priority = -0.5;
} else {
element->priority = 0.5;
}
}
#ifdef WITH_XSLT_DEBUG_PATTERN
xsltGenericDebug(xsltGenericDebugContext,
"xsltCompilePattern : parsed %s, default priority %f\n",
element->pattern, element->priority);
#endif
if (pattern[end] == '|')
end++;
current = end;
}
if (end == 0) {
xsltTransformError(NULL, style, node,
"xsltCompilePattern : NULL pattern\n");
if (style != NULL) style->errors++;
goto error;
}
xsltFreeParserContext(ctxt);
return(first);
error:
if (ctxt != NULL)
xsltFreeParserContext(ctxt);
if (first != NULL)
xsltFreeCompMatchList(first);
return(NULL);
}
/**
* xsltCompilePattern:
* @pattern: an XSLT pattern
* @doc: the containing document
* @node: the containing element
* @style: the stylesheet
* @runtime: the transformation context, if done at run-time
*
* Compile the XSLT pattern and generates a list of precompiled form suitable
* for fast matching.
*
* [1] Pattern ::= LocationPathPattern | Pattern '|' LocationPathPattern
*
* Returns the generated pattern list or NULL in case of failure
*/
xsltCompMatchPtr
xsltCompilePattern(const xmlChar *pattern, xmlDocPtr doc,
xmlNodePtr node, xsltStylesheetPtr style,
xsltTransformContextPtr runtime) {
return (xsltCompilePatternInternal(pattern, doc, node, style, runtime, 0));
}
/************************************************************************
* *
* Module interfaces *
* *
************************************************************************/
/**
* xsltAddTemplate:
* @style: an XSLT stylesheet
* @cur: an XSLT template
* @mode: the mode name or NULL
* @modeURI: the mode URI or NULL
*
* Register the XSLT pattern associated to @cur
*
* Returns -1 in case of error, 0 otherwise
*/
int
xsltAddTemplate(xsltStylesheetPtr style, xsltTemplatePtr cur,
const xmlChar *mode, const xmlChar *modeURI) {
xsltCompMatchPtr pat, list, next;
/*
* 'top' will point to style->xxxMatch ptr - declaring as 'void'
* avoids gcc 'type-punned pointer' warning.
*/
xsltCompMatchPtr *top = NULL;
const xmlChar *name = NULL;
float priority; /* the priority */
if ((style == NULL) || (cur == NULL))
return(-1);
if (cur->next != NULL)
cur->position = cur->next->position + 1;
/* Register named template */
if (cur->name != NULL) {
if (style->namedTemplates == NULL) {
style->namedTemplates = xmlHashCreate(10);
if (style->namedTemplates == NULL)
return(-1);
}
else {
void *dup = xmlHashLookup2(style->namedTemplates, cur->name,
cur->nameURI);
if (dup != NULL) {
xsltTransformError(NULL, style, cur->elem,
"xsl:template: error duplicate name '%s'\n",
cur->name);
style->errors++;
return(-1);
}
}
xmlHashAddEntry2(style->namedTemplates, cur->name, cur->nameURI, cur);
}
if (cur->match == NULL) {
if (cur->name == NULL) {
xsltTransformError(NULL, style, cur->elem,
"xsl:template: need to specify match or name attribute\n");
style->errors++;
return(-1);
}
return(0);
}
priority = cur->priority;
pat = xsltCompilePatternInternal(cur->match, style->doc, cur->elem,
style, NULL, 1);
if (pat == NULL)
return(-1);
while (pat) {
int success = 0;
next = pat->next;
pat->next = NULL;
name = NULL;
pat->template = cur;
if (mode != NULL)
pat->mode = xmlDictLookup(style->dict, mode, -1);
if (modeURI != NULL)
pat->modeURI = xmlDictLookup(style->dict, modeURI, -1);
if (priority != XSLT_PAT_NO_PRIORITY)
pat->priority = priority;
/*
* insert it in the hash table list corresponding to its lookup name
*/
switch (pat->steps[0].op) {
case XSLT_OP_ATTR:
if (pat->steps[0].value != NULL)
name = pat->steps[0].value;
else
top = &(style->attrMatch);
break;
case XSLT_OP_PARENT:
case XSLT_OP_ANCESTOR:
top = &(style->elemMatch);
break;
case XSLT_OP_ROOT:
top = &(style->rootMatch);
break;
case XSLT_OP_KEY:
top = &(style->keyMatch);
break;
case XSLT_OP_ID:
/* TODO optimize ID !!! */
case XSLT_OP_NS:
case XSLT_OP_ALL:
top = &(style->elemMatch);
break;
case XSLT_OP_END:
case XSLT_OP_PREDICATE:
xsltTransformError(NULL, style, NULL,
"xsltAddTemplate: invalid compiled pattern\n");
xsltFreeCompMatch(pat);
return(-1);
/*
* TODO: some flags at the top level about type based patterns
* would be faster than inclusion in the hash table.
*/
case XSLT_OP_PI:
if (pat->steps[0].value != NULL)
name = pat->steps[0].value;
else
top = &(style->piMatch);
break;
case XSLT_OP_COMMENT:
top = &(style->commentMatch);
break;
case XSLT_OP_TEXT:
top = &(style->textMatch);
break;
case XSLT_OP_ELEM:
case XSLT_OP_NODE:
if (pat->steps[0].value != NULL)
name = pat->steps[0].value;
else
top = &(style->elemMatch);
break;
}
if (name != NULL) {
if (style->templatesHash == NULL) {
style->templatesHash = xmlHashCreate(1024);
success = (style->templatesHash != NULL) &&
(xmlHashAddEntry3(style->templatesHash, name, mode,
modeURI, pat) >= 0);
} else {
list = (xsltCompMatchPtr) xmlHashLookup3(style->templatesHash,
name, mode, modeURI);
if (list == NULL) {
success = (xmlHashAddEntry3(style->templatesHash, name,
mode, modeURI, pat) >= 0);
} else {
/*
* Note '<=' since one must choose among the matching
* template rules that are left, the one that occurs
* last in the stylesheet
*/
if (list->priority <= pat->priority) {
pat->next = list;
xmlHashUpdateEntry3(style->templatesHash, name,
mode, modeURI, pat, NULL);
} else {
while (list->next != NULL) {
if (list->next->priority <= pat->priority)
break;
list = list->next;
}
pat->next = list->next;
list->next = pat;
}
success = 1;
}
}
} else if (top != NULL) {
list = *top;
if (list == NULL) {
*top = pat;
pat->next = NULL;
} else if (list->priority <= pat->priority) {
pat->next = list;
*top = pat;
} else {
while (list->next != NULL) {
if (list->next->priority <= pat->priority)
break;
list = list->next;
}
pat->next = list->next;
list->next = pat;
}
success = 1;
}
if (success == 0) {
xsltTransformError(NULL, style, NULL,
"xsltAddTemplate: invalid compiled pattern\n");
xsltFreeCompMatch(pat);
xsltFreeCompMatchList(next);
return(-1);
}
#ifdef WITH_XSLT_DEBUG_PATTERN
if (mode)
xsltGenericDebug(xsltGenericDebugContext,
"added pattern : '%s' mode '%s' priority %f\n",
pat->pattern, pat->mode, pat->priority);
else
xsltGenericDebug(xsltGenericDebugContext,
"added pattern : '%s' priority %f\n",
pat->pattern, pat->priority);
#endif
pat = next;
}
return(0);
}
static int
xsltComputeAllKeys(xsltTransformContextPtr ctxt, xmlNodePtr contextNode)
{
if ((ctxt == NULL) || (contextNode == NULL)) {
xsltTransformError(ctxt, NULL, ctxt->inst,
"Internal error in xsltComputeAllKeys(): "
"Bad arguments.\n");
return(-1);
}
if (ctxt->document == NULL) {
/*
* The document info will only be NULL if we have a RTF.
*/
if (contextNode->doc->_private != NULL)
goto doc_info_mismatch;
/*
* On-demand creation of the document info (needed for keys).
*/
ctxt->document = xsltNewDocument(ctxt, contextNode->doc);
if (ctxt->document == NULL)
return(-1);
}
return xsltInitAllDocKeys(ctxt);
doc_info_mismatch:
xsltTransformError(ctxt, NULL, ctxt->inst,
"Internal error in xsltComputeAllKeys(): "
"The context's document info doesn't match the "
"document info of the current result tree.\n");
ctxt->state = XSLT_STATE_STOPPED;
return(-1);
}
/**
* xsltGetTemplate:
* @ctxt: a XSLT process context
* @node: the node being processed
* @style: the current style
*
* Finds the template applying to this node, if @style is non-NULL
* it means one needs to look for the next imported template in scope.
*
* Returns the xsltTemplatePtr or NULL if not found
*/
xsltTemplatePtr
xsltGetTemplate(xsltTransformContextPtr ctxt, xmlNodePtr node,
xsltStylesheetPtr style)
{
xsltStylesheetPtr curstyle;
xsltTemplatePtr ret = NULL;
const xmlChar *name = NULL;
xsltCompMatchPtr list = NULL;
float priority;
if ((ctxt == NULL) || (node == NULL))
return(NULL);
if (style == NULL) {
curstyle = ctxt->style;
} else {
curstyle = xsltNextImport(style);
}
while ((curstyle != NULL) && (curstyle != style)) {
priority = XSLT_PAT_NO_PRIORITY;
/* TODO : handle IDs/keys here ! */
if (curstyle->templatesHash != NULL) {
/*
* Use the top name as selector
*/
switch (node->type) {
case XML_ELEMENT_NODE:
if (node->name[0] == ' ')
break;
/* Intentional fall-through */
case XML_ATTRIBUTE_NODE:
case XML_PI_NODE:
name = node->name;
break;
case XML_DOCUMENT_NODE:
case XML_HTML_DOCUMENT_NODE:
case XML_TEXT_NODE:
case XML_CDATA_SECTION_NODE:
case XML_COMMENT_NODE:
case XML_ENTITY_REF_NODE:
case XML_ENTITY_NODE:
case XML_DOCUMENT_TYPE_NODE:
case XML_DOCUMENT_FRAG_NODE:
case XML_NOTATION_NODE:
case XML_DTD_NODE:
case XML_ELEMENT_DECL:
case XML_ATTRIBUTE_DECL:
case XML_ENTITY_DECL:
case XML_NAMESPACE_DECL:
case XML_XINCLUDE_START:
case XML_XINCLUDE_END:
break;
default:
return(NULL);
}
}
if (name != NULL) {
/*
* find the list of applicable expressions based on the name
*/
list = (xsltCompMatchPtr) xmlHashLookup3(curstyle->templatesHash,
name, ctxt->mode, ctxt->modeURI);
} else
list = NULL;
while (list != NULL) {
if (xsltTestCompMatch(ctxt, list, node,
ctxt->mode, ctxt->modeURI) == 1) {
ret = list->template;
priority = list->priority;
break;
}
list = list->next;
}
list = NULL;
/*
* find alternate generic matches
*/
switch (node->type) {
case XML_ELEMENT_NODE:
if (node->name[0] == ' ')
list = curstyle->rootMatch;
else
list = curstyle->elemMatch;
break;
case XML_ATTRIBUTE_NODE: {
list = curstyle->attrMatch;
break;
}
case XML_PI_NODE:
list = curstyle->piMatch;
break;
case XML_DOCUMENT_NODE:
case XML_HTML_DOCUMENT_NODE: {
list = curstyle->rootMatch;
break;
}
case XML_TEXT_NODE:
case XML_CDATA_SECTION_NODE:
list = curstyle->textMatch;
break;
case XML_COMMENT_NODE:
list = curstyle->commentMatch;
break;
case XML_ENTITY_REF_NODE:
case XML_ENTITY_NODE:
case XML_DOCUMENT_TYPE_NODE:
case XML_DOCUMENT_FRAG_NODE:
case XML_NOTATION_NODE:
case XML_DTD_NODE:
case XML_ELEMENT_DECL:
case XML_ATTRIBUTE_DECL:
case XML_ENTITY_DECL:
case XML_NAMESPACE_DECL:
case XML_XINCLUDE_START:
case XML_XINCLUDE_END:
break;
default:
break;
}
while ((list != NULL) &&
((ret == NULL) ||
(list->priority > priority) ||
((list->priority == priority) &&
(list->template->position > ret->position)))) {
if (xsltTestCompMatch(ctxt, list, node,
ctxt->mode, ctxt->modeURI) == 1) {
ret = list->template;
priority = list->priority;
break;
}
list = list->next;
}
/*
* Some of the tests for elements can also apply to documents
*/
if ((node->type == XML_DOCUMENT_NODE) ||
(node->type == XML_HTML_DOCUMENT_NODE) ||
(node->type == XML_TEXT_NODE)) {
list = curstyle->elemMatch;
while ((list != NULL) &&
((ret == NULL) ||
(list->priority > priority) ||
((list->priority == priority) &&
(list->template->position > ret->position)))) {
if (xsltTestCompMatch(ctxt, list, node,
ctxt->mode, ctxt->modeURI) == 1) {
ret = list->template;
priority = list->priority;
break;
}
list = list->next;
}
} else if ((node->type == XML_PI_NODE) ||
(node->type == XML_COMMENT_NODE)) {
list = curstyle->elemMatch;
while ((list != NULL) &&
((ret == NULL) ||
(list->priority > priority) ||
((list->priority == priority) &&
(list->template->position > ret->position)))) {
if (xsltTestCompMatch(ctxt, list, node,
ctxt->mode, ctxt->modeURI) == 1) {
ret = list->template;
priority = list->priority;
break;
}
list = list->next;
}
}
keyed_match:
if (xsltGetSourceNodeFlags(node) & XSLT_SOURCE_NODE_HAS_KEY) {
list = curstyle->keyMatch;
while ((list != NULL) &&
((ret == NULL) ||
(list->priority > priority) ||
((list->priority == priority) &&
(list->template->position > ret->position)))) {
if (xsltTestCompMatch(ctxt, list, node,
ctxt->mode, ctxt->modeURI) == 1) {
ret = list->template;
priority = list->priority;
break;
}
list = list->next;
}
}
else if (ctxt->hasTemplKeyPatterns &&
((ctxt->document == NULL) ||
(ctxt->document->nbKeysComputed < ctxt->nbKeys)))
{
/*
* Compute all remaining keys for this document.
*
* REVISIT TODO: I think this could be further optimized.
*/
if (xsltComputeAllKeys(ctxt, node) == -1)
goto error;
if (xsltGetSourceNodeFlags(node) & XSLT_SOURCE_NODE_HAS_KEY)
goto keyed_match;
}
if (ret != NULL)
return(ret);
/*
* Cycle on next curstylesheet import.
*/
curstyle = xsltNextImport(curstyle);
}
error:
return(NULL);
}
/**
* xsltCleanupTemplates:
* @style: an XSLT stylesheet
*
* Cleanup the state of the templates used by the stylesheet and
* the ones it imports.
*/
void
xsltCleanupTemplates(xsltStylesheetPtr style ATTRIBUTE_UNUSED) {
}
/**
* xsltFreeTemplateHashes:
* @style: an XSLT stylesheet
*
* Free up the memory used by xsltAddTemplate/xsltGetTemplate mechanism
*/
void
xsltFreeTemplateHashes(xsltStylesheetPtr style) {
if (style->templatesHash != NULL)
xmlHashFree(style->templatesHash, xsltFreeCompMatchListEntry);
if (style->rootMatch != NULL)
xsltFreeCompMatchList(style->rootMatch);
if (style->keyMatch != NULL)
xsltFreeCompMatchList(style->keyMatch);
if (style->elemMatch != NULL)
xsltFreeCompMatchList(style->elemMatch);
if (style->attrMatch != NULL)
xsltFreeCompMatchList(style->attrMatch);
if (style->parentMatch != NULL)
xsltFreeCompMatchList(style->parentMatch);
if (style->textMatch != NULL)
xsltFreeCompMatchList(style->textMatch);
if (style->piMatch != NULL)
xsltFreeCompMatchList(style->piMatch);
if (style->commentMatch != NULL)
xsltFreeCompMatchList(style->commentMatch);
if (style->namedTemplates != NULL)
xmlHashFree(style->namedTemplates, NULL);
}
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