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libxml2/pattern.c
Nick Wellnhofer 4467b89143 Add missing argument checks for new API functions
2024-06-12 13:57:20 +02:00

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/*
* pattern.c: Implementation of selectors for nodes
*
* Reference:
* http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/
* to some extent
* http://www.w3.org/TR/1999/REC-xml-19991116
*
* See Copyright for the status of this software.
*
* daniel@veillard.com
*/
/*
* TODO:
* - compilation flags to check for specific syntaxes
* using flags of xmlPatterncompile()
* - making clear how pattern starting with / or . need to be handled,
* currently push(NULL, NULL) means a reset of the streaming context
* and indicating we are on / (the document node), probably need
* something similar for .
* - get rid of the "compile" starting with lowercase
* - DONE (2006-05-16): get rid of the Strdup/Strndup in case of dictionary
*/
#define IN_LIBXML
#include "libxml.h"
#include <string.h>
#include <libxml/pattern.h>
#include <libxml/xmlmemory.h>
#include <libxml/tree.h>
#include <libxml/dict.h>
#include <libxml/xmlerror.h>
#include <libxml/parserInternals.h>
#ifdef LIBXML_PATTERN_ENABLED
#ifdef ERROR
#undef ERROR
#endif
#define ERROR(a, b, c, d)
#define ERROR5(a, b, c, d, e)
#define XML_STREAM_STEP_DESC 1
#define XML_STREAM_STEP_FINAL 2
#define XML_STREAM_STEP_ROOT 4
#define XML_STREAM_STEP_ATTR 8
#define XML_STREAM_STEP_NODE 16
#define XML_STREAM_STEP_IN_SET 32
/*
* NOTE: Those private flags (XML_STREAM_xxx) are used
* in _xmlStreamCtxt->flag. They extend the public
* xmlPatternFlags, so be careful not to interfere with the
* reserved values for xmlPatternFlags.
*/
#define XML_STREAM_FINAL_IS_ANY_NODE 1<<14
#define XML_STREAM_FROM_ROOT 1<<15
#define XML_STREAM_DESC 1<<16
/*
* XML_STREAM_ANY_NODE is used for comparison against
* xmlElementType enums, to indicate a node of any type.
*/
#define XML_STREAM_ANY_NODE 100
#define XML_PATTERN_NOTPATTERN (XML_PATTERN_XPATH | \
XML_PATTERN_XSSEL | \
XML_PATTERN_XSFIELD)
#define XML_STREAM_XS_IDC(c) ((c)->flags & \
(XML_PATTERN_XSSEL | XML_PATTERN_XSFIELD))
#define XML_STREAM_XS_IDC_SEL(c) ((c)->flags & XML_PATTERN_XSSEL)
#define XML_STREAM_XS_IDC_FIELD(c) ((c)->flags & XML_PATTERN_XSFIELD)
#define XML_PAT_COPY_NSNAME(c, r, nsname) \
if ((c)->comp->dict) \
r = (xmlChar *) xmlDictLookup((c)->comp->dict, BAD_CAST nsname, -1); \
else r = xmlStrdup(BAD_CAST nsname);
#define XML_PAT_FREE_STRING(c, r) if ((c)->comp->dict == NULL) xmlFree(r);
typedef struct _xmlStreamStep xmlStreamStep;
typedef xmlStreamStep *xmlStreamStepPtr;
struct _xmlStreamStep {
int flags; /* properties of that step */
const xmlChar *name; /* first string value if NULL accept all */
const xmlChar *ns; /* second string value */
int nodeType; /* type of node */
};
typedef struct _xmlStreamComp xmlStreamComp;
typedef xmlStreamComp *xmlStreamCompPtr;
struct _xmlStreamComp {
xmlDict *dict; /* the dictionary if any */
int nbStep; /* number of steps in the automata */
int maxStep; /* allocated number of steps */
xmlStreamStepPtr steps; /* the array of steps */
int flags;
};
struct _xmlStreamCtxt {
struct _xmlStreamCtxt *next;/* link to next sub pattern if | */
xmlStreamCompPtr comp; /* the compiled stream */
int nbState; /* number of states in the automata */
int maxState; /* allocated number of states */
int level; /* how deep are we ? */
int *states; /* the array of step indexes */
int flags; /* validation options */
int blockLevel;
};
static void xmlFreeStreamComp(xmlStreamCompPtr comp);
/*
* Types are private:
*/
typedef enum {
XML_OP_END=0,
XML_OP_ROOT,
XML_OP_ELEM,
XML_OP_CHILD,
XML_OP_ATTR,
XML_OP_PARENT,
XML_OP_ANCESTOR,
XML_OP_NS,
XML_OP_ALL
} xmlPatOp;
typedef struct _xmlStepState xmlStepState;
typedef xmlStepState *xmlStepStatePtr;
struct _xmlStepState {
int step;
xmlNodePtr node;
};
typedef struct _xmlStepStates xmlStepStates;
typedef xmlStepStates *xmlStepStatesPtr;
struct _xmlStepStates {
int nbstates;
int maxstates;
xmlStepStatePtr states;
};
typedef struct _xmlStepOp xmlStepOp;
typedef xmlStepOp *xmlStepOpPtr;
struct _xmlStepOp {
xmlPatOp op;
const xmlChar *value;
const xmlChar *value2; /* The namespace name */
};
#define PAT_FROM_ROOT (1<<8)
#define PAT_FROM_CUR (1<<9)
struct _xmlPattern {
void *data; /* the associated template */
xmlDictPtr dict; /* the optional dictionary */
struct _xmlPattern *next; /* next pattern if | is used */
const xmlChar *pattern; /* the pattern */
int flags; /* flags */
int nbStep;
int maxStep;
xmlStepOpPtr steps; /* ops for computation */
xmlStreamCompPtr stream; /* the streaming data if any */
};
typedef struct _xmlPatParserContext xmlPatParserContext;
typedef xmlPatParserContext *xmlPatParserContextPtr;
struct _xmlPatParserContext {
const xmlChar *cur; /* the current char being parsed */
const xmlChar *base; /* the full expression */
int error; /* error code */
xmlDictPtr dict; /* the dictionary if any */
xmlPatternPtr comp; /* the result */
xmlNodePtr elem; /* the current node if any */
const xmlChar **namespaces; /* the namespaces definitions */
int nb_namespaces; /* the number of namespaces */
};
/************************************************************************
* *
* Type functions *
* *
************************************************************************/
/**
* xmlNewPattern:
*
* Create a new XSLT Pattern
*
* Returns the newly allocated xmlPatternPtr or NULL in case of error
*/
static xmlPatternPtr
xmlNewPattern(void) {
xmlPatternPtr cur;
cur = (xmlPatternPtr) xmlMalloc(sizeof(xmlPattern));
if (cur == NULL) {
ERROR(NULL, NULL, NULL,
"xmlNewPattern : malloc failed\n");
return(NULL);
}
memset(cur, 0, sizeof(xmlPattern));
cur->maxStep = 10;
cur->steps = (xmlStepOpPtr) xmlMalloc(cur->maxStep * sizeof(xmlStepOp));
if (cur->steps == NULL) {
xmlFree(cur);
ERROR(NULL, NULL, NULL,
"xmlNewPattern : malloc failed\n");
return(NULL);
}
return(cur);
}
/**
* xmlFreePattern:
* @comp: an XSLT comp
*
* Free up the memory allocated by @comp
*/
void
xmlFreePattern(xmlPatternPtr comp) {
xmlFreePatternList(comp);
}
static void
xmlFreePatternInternal(xmlPatternPtr comp) {
xmlStepOpPtr op;
int i;
if (comp == NULL)
return;
if (comp->stream != NULL)
xmlFreeStreamComp(comp->stream);
if (comp->pattern != NULL)
xmlFree((xmlChar *)comp->pattern);
if (comp->steps != NULL) {
if (comp->dict == NULL) {
for (i = 0;i < comp->nbStep;i++) {
op = &comp->steps[i];
if (op->value != NULL)
xmlFree((xmlChar *) op->value);
if (op->value2 != NULL)
xmlFree((xmlChar *) op->value2);
}
}
xmlFree(comp->steps);
}
if (comp->dict != NULL)
xmlDictFree(comp->dict);
memset(comp, -1, sizeof(xmlPattern));
xmlFree(comp);
}
/**
* xmlFreePatternList:
* @comp: an XSLT comp list
*
* Free up the memory allocated by all the elements of @comp
*/
void
xmlFreePatternList(xmlPatternPtr comp) {
xmlPatternPtr cur;
while (comp != NULL) {
cur = comp;
comp = comp->next;
cur->next = NULL;
xmlFreePatternInternal(cur);
}
}
/**
* xmlNewPatParserContext:
* @pattern: the pattern context
* @dict: the inherited dictionary or NULL
* @namespaces: the prefix definitions, array of [URI, prefix] terminated
* with [NULL, NULL] or NULL if no namespace is used
*
* Create a new XML pattern parser context
*
* Returns the newly allocated xmlPatParserContextPtr or NULL in case of error
*/
static xmlPatParserContextPtr
xmlNewPatParserContext(const xmlChar *pattern, xmlDictPtr dict,
const xmlChar **namespaces) {
xmlPatParserContextPtr cur;
if (pattern == NULL)
return(NULL);
cur = (xmlPatParserContextPtr) xmlMalloc(sizeof(xmlPatParserContext));
if (cur == NULL) {
ERROR(NULL, NULL, NULL,
"xmlNewPatParserContext : malloc failed\n");
return(NULL);
}
memset(cur, 0, sizeof(xmlPatParserContext));
cur->dict = dict;
cur->cur = pattern;
cur->base = pattern;
if (namespaces != NULL) {
int i;
for (i = 0;namespaces[2 * i] != NULL;i++)
;
cur->nb_namespaces = i;
} else {
cur->nb_namespaces = 0;
}
cur->namespaces = namespaces;
return(cur);
}
/**
* xmlFreePatParserContext:
* @ctxt: an XSLT parser context
*
* Free up the memory allocated by @ctxt
*/
static void
xmlFreePatParserContext(xmlPatParserContextPtr ctxt) {
if (ctxt == NULL)
return;
memset(ctxt, -1, sizeof(xmlPatParserContext));
xmlFree(ctxt);
}
/**
* xmlPatternAdd:
* @comp: the compiled match expression
* @op: an op
* @value: the first value
* @value2: the second value
*
* Add a step to an XSLT Compiled Match
*
* Returns -1 in case of failure, 0 otherwise.
*/
static int
xmlPatternAdd(xmlPatParserContextPtr ctxt, xmlPatternPtr comp,
xmlPatOp op, xmlChar * value, xmlChar * value2)
{
if (comp->nbStep >= comp->maxStep) {
xmlStepOpPtr temp;
temp = (xmlStepOpPtr) xmlRealloc(comp->steps, comp->maxStep * 2 *
sizeof(xmlStepOp));
if (temp == NULL) {
ERROR(ctxt, NULL, NULL,
"xmlPatternAdd: realloc failed\n");
ctxt->error = -1;
return (-1);
}
comp->steps = temp;
comp->maxStep *= 2;
}
comp->steps[comp->nbStep].op = op;
comp->steps[comp->nbStep].value = value;
comp->steps[comp->nbStep].value2 = value2;
comp->nbStep++;
return (0);
}
#if 0
/**
* xsltSwapTopPattern:
* @comp: the compiled match expression
*
* reverse the two top steps.
*/
static void
xsltSwapTopPattern(xmlPatternPtr comp) {
int i;
int j = comp->nbStep - 1;
if (j > 0) {
register const xmlChar *tmp;
register xmlPatOp op;
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;
op = comp->steps[i].op;
comp->steps[i].op = comp->steps[j].op;
comp->steps[j].op = op;
}
}
#endif
/**
* xmlReversePattern:
* @comp: the compiled match expression
*
* reverse all the stack of expressions
*
* returns 0 in case of success and -1 in case of error.
*/
static int
xmlReversePattern(xmlPatternPtr comp) {
int i, j;
/*
* remove the leading // for //a or .//a
*/
if ((comp->nbStep > 0) && (comp->steps[0].op == XML_OP_ANCESTOR)) {
for (i = 0, j = 1;j < comp->nbStep;i++,j++) {
comp->steps[i].value = comp->steps[j].value;
comp->steps[i].value2 = comp->steps[j].value2;
comp->steps[i].op = comp->steps[j].op;
}
comp->nbStep--;
}
if (comp->nbStep >= comp->maxStep) {
xmlStepOpPtr temp;
temp = (xmlStepOpPtr) xmlRealloc(comp->steps, comp->maxStep * 2 *
sizeof(xmlStepOp));
if (temp == NULL) {
ERROR(ctxt, NULL, NULL,
"xmlReversePattern: realloc failed\n");
return (-1);
}
comp->steps = temp;
comp->maxStep *= 2;
}
i = 0;
j = comp->nbStep - 1;
while (j > i) {
register const xmlChar *tmp;
register xmlPatOp op;
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;
op = comp->steps[i].op;
comp->steps[i].op = comp->steps[j].op;
comp->steps[j].op = op;
j--;
i++;
}
comp->steps[comp->nbStep].value = NULL;
comp->steps[comp->nbStep].value2 = NULL;
comp->steps[comp->nbStep++].op = XML_OP_END;
return(0);
}
/************************************************************************
* *
* The interpreter for the precompiled patterns *
* *
************************************************************************/
static int
xmlPatPushState(xmlStepStates *states, int step, xmlNodePtr node) {
if ((states->states == NULL) || (states->maxstates <= 0)) {
states->maxstates = 4;
states->nbstates = 0;
states->states = xmlMalloc(4 * sizeof(xmlStepState));
}
else if (states->maxstates <= states->nbstates) {
xmlStepState *tmp;
tmp = (xmlStepStatePtr) xmlRealloc(states->states,
2 * states->maxstates * sizeof(xmlStepState));
if (tmp == NULL)
return(-1);
states->states = tmp;
states->maxstates *= 2;
}
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);
}
/**
* xmlPatMatch:
* @comp: the precompiled pattern
* @node: a node
*
* 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
xmlPatMatch(xmlPatternPtr comp, xmlNodePtr node) {
int i;
xmlStepOpPtr step;
xmlStepStates states = {0, 0, NULL}; /* // may require backtrack */
if ((comp == NULL) || (node == NULL)) return(-1);
i = 0;
restart:
for (;i < comp->nbStep;i++) {
step = &comp->steps[i];
switch (step->op) {
case XML_OP_END:
goto found;
case XML_OP_ROOT:
if (node->type == XML_NAMESPACE_DECL)
goto rollback;
node = node->parent;
if ((node->type == XML_DOCUMENT_NODE) ||
(node->type == XML_HTML_DOCUMENT_NODE))
continue;
goto rollback;
case XML_OP_ELEM:
if (node->type != XML_ELEMENT_NODE)
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 XML_OP_CHILD: {
xmlNodePtr lst;
if ((node->type != XML_ELEMENT_NODE) &&
(node->type != XML_DOCUMENT_NODE) &&
(node->type != XML_HTML_DOCUMENT_NODE))
goto rollback;
lst = node->children;
if (step->value != NULL) {
while (lst != NULL) {
if ((lst->type == XML_ELEMENT_NODE) &&
(step->value[0] == lst->name[0]) &&
(xmlStrEqual(step->value, lst->name)))
break;
lst = lst->next;
}
if (lst != NULL)
continue;
}
goto rollback;
}
case XML_OP_ATTR:
if (node->type != XML_ATTRIBUTE_NODE)
goto rollback;
if (step->value != NULL) {
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 (step->value2 != NULL) {
if (!xmlStrEqual(step->value2, node->ns->href))
goto rollback;
}
continue;
case XML_OP_PARENT:
if ((node->type == XML_DOCUMENT_NODE) ||
(node->type == XML_HTML_DOCUMENT_NODE) ||
(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 XML_OP_ANCESTOR:
/* TODO: implement coalescing of ANCESTOR/NODE ops */
if (step->value == NULL) {
i++;
step = &comp->steps[i];
if (step->op == XML_OP_ROOT)
goto found;
if (step->op != XML_OP_ELEM)
goto rollback;
if (step->value == NULL)
return(-1);
}
if (node == NULL)
goto rollback;
if ((node->type == XML_DOCUMENT_NODE) ||
(node->type == XML_HTML_DOCUMENT_NODE) ||
(node->type == XML_NAMESPACE_DECL))
goto rollback;
node = node->parent;
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;
/*
* prepare a potential rollback from here
* for ancestors of that node.
*/
if (step->op == XML_OP_ANCESTOR)
xmlPatPushState(&states, i, node);
else
xmlPatPushState(&states, i - 1, node);
continue;
case XML_OP_NS:
if (node->type != XML_ELEMENT_NODE)
goto rollback;
if (node->ns == NULL) {
if (step->value != NULL)
goto rollback;
} else if (node->ns->href != NULL) {
if (step->value == NULL)
goto rollback;
if (!xmlStrEqual(step->value, node->ns->href))
goto rollback;
}
break;
case XML_OP_ALL:
if (node->type != XML_ELEMENT_NODE)
goto rollback;
break;
}
}
found:
if (states.states != NULL) {
/* Free the rollback states */
xmlFree(states.states);
}
return(1);
rollback:
/* got an error try to rollback */
if (states.states == NULL)
return(0);
if (states.nbstates <= 0) {
xmlFree(states.states);
return(0);
}
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;
}
/************************************************************************
* *
* Dedicated parser for templates *
* *
************************************************************************/
#define CUR (*ctxt->cur)
#define SKIP(val) ctxt->cur += (val)
#define NXT(val) ctxt->cur[(val)]
#define PEEKPREV(val) ctxt->cur[-(val)]
#define CUR_PTR ctxt->cur
#define SKIP_BLANKS \
while (IS_BLANK_CH(CUR)) NEXT
#define CURRENT (*ctxt->cur)
#define NEXT ((*ctxt->cur) ? ctxt->cur++: ctxt->cur)
#define PUSH(op, val, val2) \
if (xmlPatternAdd(ctxt, ctxt->comp, (op), (val), (val2))) goto error;
#if 0
/**
* xmlPatScanLiteral:
* @ctxt: the XPath Parser context
*
* Parse an XPath Literal:
*
* [29] Literal ::= '"' [^"]* '"'
* | "'" [^']* "'"
*
* Returns the Literal parsed or NULL
*/
static xmlChar *
xmlPatScanLiteral(xmlPatParserContextPtr ctxt) {
const xmlChar *q, *cur;
xmlChar *ret = NULL;
int val, len;
SKIP_BLANKS;
if (CUR == '"') {
NEXT;
cur = q = CUR_PTR;
val = xmlStringCurrentChar(NULL, cur, &len);
while ((IS_CHAR(val)) && (val != '"')) {
cur += len;
val = xmlStringCurrentChar(NULL, cur, &len);
}
if (!IS_CHAR(val)) {
ctxt->error = 1;
return(NULL);
} else {
if (ctxt->dict)
ret = (xmlChar *) xmlDictLookup(ctxt->dict, q, cur - q);
else
ret = xmlStrndup(q, cur - q);
}
cur += len;
CUR_PTR = cur;
} else if (CUR == '\'') {
NEXT;
cur = q = CUR_PTR;
val = xmlStringCurrentChar(NULL, cur, &len);
while ((IS_CHAR(val)) && (val != '\'')) {
cur += len;
val = xmlStringCurrentChar(NULL, cur, &len);
}
if (!IS_CHAR(val)) {
ctxt->error = 1;
return(NULL);
} else {
if (ctxt->dict)
ret = (xmlChar *) xmlDictLookup(ctxt->dict, q, cur - q);
else
ret = xmlStrndup(q, cur - q);
}
cur += len;
CUR_PTR = cur;
} else {
/* XP_ERROR(XPATH_START_LITERAL_ERROR); */
ctxt->error = 1;
return(NULL);
}
return(ret);
}
#endif
/**
* xmlPatScanName:
* @ctxt: the XPath Parser context
*
* [4] NameChar ::= Letter | Digit | '.' | '-' | '_' |
* CombiningChar | Extender
*
* [5] Name ::= (Letter | '_' | ':') (NameChar)*
*
* [6] Names ::= Name (S Name)*
*
* Returns the Name parsed or NULL
*/
static xmlChar *
xmlPatScanName(xmlPatParserContextPtr ctxt) {
const xmlChar *q, *cur;
xmlChar *ret = NULL;
int val, len;
SKIP_BLANKS;
cur = q = CUR_PTR;
val = xmlStringCurrentChar(NULL, cur, &len);
if (!IS_LETTER(val) && (val != '_') && (val != ':'))
return(NULL);
while ((IS_LETTER(val)) || (IS_DIGIT(val)) ||
(val == '.') || (val == '-') ||
(val == '_') ||
(IS_COMBINING(val)) ||
(IS_EXTENDER(val))) {
cur += len;
val = xmlStringCurrentChar(NULL, cur, &len);
}
if (ctxt->dict)
ret = (xmlChar *) xmlDictLookup(ctxt->dict, q, cur - q);
else
ret = xmlStrndup(q, cur - q);
CUR_PTR = cur;
return(ret);
}
/**
* xmlPatScanNCName:
* @ctxt: the XPath Parser context
*
* Parses a non qualified name
*
* Returns the Name parsed or NULL
*/
static xmlChar *
xmlPatScanNCName(xmlPatParserContextPtr ctxt) {
const xmlChar *q, *cur;
xmlChar *ret = NULL;
int val, len;
SKIP_BLANKS;
cur = q = CUR_PTR;
val = xmlStringCurrentChar(NULL, cur, &len);
if (!IS_LETTER(val) && (val != '_'))
return(NULL);
while ((IS_LETTER(val)) || (IS_DIGIT(val)) ||
(val == '.') || (val == '-') ||
(val == '_') ||
(IS_COMBINING(val)) ||
(IS_EXTENDER(val))) {
cur += len;
val = xmlStringCurrentChar(NULL, cur, &len);
}
if (ctxt->dict)
ret = (xmlChar *) xmlDictLookup(ctxt->dict, q, cur - q);
else
ret = xmlStrndup(q, cur - q);
if (ret == NULL)
ctxt->error = -1;
CUR_PTR = cur;
return(ret);
}
#if 0
/**
* xmlPatScanQName:
* @ctxt: the XPath Parser context
* @prefix: the place to store the prefix
*
* Parse a qualified name
*
* Returns the Name parsed or NULL
*/
static xmlChar *
xmlPatScanQName(xmlPatParserContextPtr ctxt, xmlChar **prefix) {
xmlChar *ret = NULL;
*prefix = NULL;
ret = xmlPatScanNCName(ctxt);
if (CUR == ':') {
*prefix = ret;
NEXT;
ret = xmlPatScanNCName(ctxt);
}
return(ret);
}
#endif
/**
* xmlCompileAttributeTest:
* @ctxt: the compilation context
*
* Compile an attribute test.
*/
static void
xmlCompileAttributeTest(xmlPatParserContextPtr ctxt) {
xmlChar *token = NULL;
xmlChar *name = NULL;
xmlChar *URL = NULL;
SKIP_BLANKS;
name = xmlPatScanNCName(ctxt);
if (ctxt->error < 0)
return;
if (name == NULL) {
if (CUR == '*') {
PUSH(XML_OP_ATTR, NULL, NULL);
NEXT;
} else {
ERROR(NULL, NULL, NULL,
"xmlCompileAttributeTest : Name expected\n");
ctxt->error = 1;
}
return;
}
if (CUR == ':') {
int i;
xmlChar *prefix = name;
NEXT;
if (IS_BLANK_CH(CUR)) {
ERROR5(NULL, NULL, NULL, "Invalid QName.\n", NULL);
ctxt->error = 1;
goto error;
}
/*
* This is a namespace match
*/
token = xmlPatScanName(ctxt);
if ((prefix[0] == 'x') &&
(prefix[1] == 'm') &&
(prefix[2] == 'l') &&
(prefix[3] == 0))
{
XML_PAT_COPY_NSNAME(ctxt, URL, XML_XML_NAMESPACE);
} else {
for (i = 0;i < ctxt->nb_namespaces;i++) {
if (xmlStrEqual(ctxt->namespaces[2 * i + 1], prefix)) {
XML_PAT_COPY_NSNAME(ctxt, URL, ctxt->namespaces[2 * i])
break;
}
}
if (i >= ctxt->nb_namespaces) {
ERROR5(NULL, NULL, NULL,
"xmlCompileAttributeTest : no namespace bound to prefix %s\n",
prefix);
ctxt->error = 1;
goto error;
}
}
XML_PAT_FREE_STRING(ctxt, name);
name = NULL;
if (token == NULL) {
if (CUR == '*') {
NEXT;
PUSH(XML_OP_ATTR, NULL, URL);
} else {
ERROR(NULL, NULL, NULL,
"xmlCompileAttributeTest : Name expected\n");
ctxt->error = 1;
goto error;
}
} else {
PUSH(XML_OP_ATTR, token, URL);
}
} else {
PUSH(XML_OP_ATTR, name, NULL);
}
return;
error:
if (name != NULL)
XML_PAT_FREE_STRING(ctxt, name);
if (URL != NULL)
XML_PAT_FREE_STRING(ctxt, URL)
if (token != NULL)
XML_PAT_FREE_STRING(ctxt, token);
}
/**
* xmlCompileStepPattern:
* @ctxt: the compilation context
*
* Compile the Step Pattern and generates a precompiled
* form suitable for fast matching.
*
* [3] Step ::= '.' | NameTest
* [4] NameTest ::= QName | '*' | NCName ':' '*'
*/
static void
xmlCompileStepPattern(xmlPatParserContextPtr ctxt) {
xmlChar *token = NULL;
xmlChar *name = NULL;
xmlChar *URL = NULL;
int hasBlanks = 0;
SKIP_BLANKS;
if (CUR == '.') {
/*
* Context node.
*/
NEXT;
PUSH(XML_OP_ELEM, NULL, NULL);
return;
}
if (CUR == '@') {
/*
* Attribute test.
*/
if (XML_STREAM_XS_IDC_SEL(ctxt->comp)) {
ERROR5(NULL, NULL, NULL,
"Unexpected attribute axis in '%s'.\n", ctxt->base);
ctxt->error = 1;
return;
}
NEXT;
xmlCompileAttributeTest(ctxt);
if (ctxt->error != 0)
goto error;
return;
}
name = xmlPatScanNCName(ctxt);
if (ctxt->error < 0)
return;
if (name == NULL) {
if (CUR == '*') {
NEXT;
PUSH(XML_OP_ALL, NULL, NULL);
return;
} else {
ERROR(NULL, NULL, NULL,
"xmlCompileStepPattern : Name expected\n");
ctxt->error = 1;
return;
}
}
if (IS_BLANK_CH(CUR)) {
hasBlanks = 1;
SKIP_BLANKS;
}
if (CUR == ':') {
NEXT;
if (CUR != ':') {
xmlChar *prefix = name;
int i;
if (hasBlanks || IS_BLANK_CH(CUR)) {
ERROR5(NULL, NULL, NULL, "Invalid QName.\n", NULL);
ctxt->error = 1;
goto error;
}
/*
* This is a namespace match
*/
token = xmlPatScanName(ctxt);
if ((prefix[0] == 'x') &&
(prefix[1] == 'm') &&
(prefix[2] == 'l') &&
(prefix[3] == 0))
{
XML_PAT_COPY_NSNAME(ctxt, URL, XML_XML_NAMESPACE)
} else {
for (i = 0;i < ctxt->nb_namespaces;i++) {
if (xmlStrEqual(ctxt->namespaces[2 * i + 1], prefix)) {
XML_PAT_COPY_NSNAME(ctxt, URL, ctxt->namespaces[2 * i])
break;
}
}
if (i >= ctxt->nb_namespaces) {
ERROR5(NULL, NULL, NULL,
"xmlCompileStepPattern : no namespace bound to prefix %s\n",
prefix);
ctxt->error = 1;
goto error;
}
}
XML_PAT_FREE_STRING(ctxt, prefix);
name = NULL;
if (token == NULL) {
if (CUR == '*') {
NEXT;
PUSH(XML_OP_NS, URL, NULL);
} else {
ERROR(NULL, NULL, NULL,
"xmlCompileStepPattern : Name expected\n");
ctxt->error = 1;
goto error;
}
} else {
PUSH(XML_OP_ELEM, token, URL);
}
} else {
NEXT;
if (xmlStrEqual(name, (const xmlChar *) "child")) {
XML_PAT_FREE_STRING(ctxt, name);
name = xmlPatScanName(ctxt);
if (name == NULL) {
if (CUR == '*') {
NEXT;
PUSH(XML_OP_ALL, NULL, NULL);
return;
} else {
ERROR(NULL, NULL, NULL,
"xmlCompileStepPattern : QName expected\n");
ctxt->error = 1;
goto error;
}
}
if (CUR == ':') {
xmlChar *prefix = name;
int i;
NEXT;
if (IS_BLANK_CH(CUR)) {
ERROR5(NULL, NULL, NULL, "Invalid QName.\n", NULL);
ctxt->error = 1;
goto error;
}
/*
* This is a namespace match
*/
token = xmlPatScanName(ctxt);
if ((prefix[0] == 'x') &&
(prefix[1] == 'm') &&
(prefix[2] == 'l') &&
(prefix[3] == 0))
{
XML_PAT_COPY_NSNAME(ctxt, URL, XML_XML_NAMESPACE)
} else {
for (i = 0;i < ctxt->nb_namespaces;i++) {
if (xmlStrEqual(ctxt->namespaces[2 * i + 1], prefix)) {
XML_PAT_COPY_NSNAME(ctxt, URL, ctxt->namespaces[2 * i])
break;
}
}
if (i >= ctxt->nb_namespaces) {
ERROR5(NULL, NULL, NULL,
"xmlCompileStepPattern : no namespace bound "
"to prefix %s\n", prefix);
ctxt->error = 1;
goto error;
}
}
XML_PAT_FREE_STRING(ctxt, prefix);
name = NULL;
if (token == NULL) {
if (CUR == '*') {
NEXT;
PUSH(XML_OP_NS, URL, NULL);
} else {
ERROR(NULL, NULL, NULL,
"xmlCompileStepPattern : Name expected\n");
ctxt->error = 1;
goto error;
}
} else {
PUSH(XML_OP_CHILD, token, URL);
}
} else
PUSH(XML_OP_CHILD, name, NULL);
return;
} else if (xmlStrEqual(name, (const xmlChar *) "attribute")) {
XML_PAT_FREE_STRING(ctxt, name)
name = NULL;
if (XML_STREAM_XS_IDC_SEL(ctxt->comp)) {
ERROR5(NULL, NULL, NULL,
"Unexpected attribute axis in '%s'.\n", ctxt->base);
ctxt->error = 1;
goto error;
}
xmlCompileAttributeTest(ctxt);
if (ctxt->error != 0)
goto error;
return;
} else {
ERROR5(NULL, NULL, NULL,
"The 'element' or 'attribute' axis is expected.\n", NULL);
ctxt->error = 1;
goto error;
}
}
} else if (CUR == '*') {
if (name != NULL) {
ctxt->error = 1;
goto error;
}
NEXT;
PUSH(XML_OP_ALL, token, NULL);
} else {
PUSH(XML_OP_ELEM, name, NULL);
}
return;
error:
if (URL != NULL)
XML_PAT_FREE_STRING(ctxt, URL)
if (token != NULL)
XML_PAT_FREE_STRING(ctxt, token)
if (name != NULL)
XML_PAT_FREE_STRING(ctxt, name)
}
/**
* xmlCompilePathPattern:
* @ctxt: the compilation context
*
* Compile the Path Pattern and generates a precompiled
* form suitable for fast matching.
*
* [5] Path ::= ('.//')? ( Step '/' )* ( Step | '@' NameTest )
*/
static void
xmlCompilePathPattern(xmlPatParserContextPtr ctxt) {
SKIP_BLANKS;
if (CUR == '/') {
ctxt->comp->flags |= PAT_FROM_ROOT;
} else if ((CUR == '.') || (ctxt->comp->flags & XML_PATTERN_NOTPATTERN)) {
ctxt->comp->flags |= PAT_FROM_CUR;
}
if ((CUR == '/') && (NXT(1) == '/')) {
PUSH(XML_OP_ANCESTOR, NULL, NULL);
NEXT;
NEXT;
} else if ((CUR == '.') && (NXT(1) == '/') && (NXT(2) == '/')) {
PUSH(XML_OP_ANCESTOR, NULL, NULL);
NEXT;
NEXT;
NEXT;
/* Check for incompleteness. */
SKIP_BLANKS;
if (CUR == 0) {
ERROR5(NULL, NULL, NULL,
"Incomplete expression '%s'.\n", ctxt->base);
ctxt->error = 1;
goto error;
}
}
if (CUR == '@') {
NEXT;
xmlCompileAttributeTest(ctxt);
if (ctxt->error != 0)
goto error;
SKIP_BLANKS;
/* TODO: check for incompleteness */
if (CUR != 0) {
xmlCompileStepPattern(ctxt);
if (ctxt->error != 0)
goto error;
}
} else {
if (CUR == '/') {
PUSH(XML_OP_ROOT, NULL, NULL);
NEXT;
/* Check for incompleteness. */
SKIP_BLANKS;
if (CUR == 0) {
ERROR5(NULL, NULL, NULL,
"Incomplete expression '%s'.\n", ctxt->base);
ctxt->error = 1;
goto error;
}
}
xmlCompileStepPattern(ctxt);
if (ctxt->error != 0)
goto error;
SKIP_BLANKS;
while (CUR == '/') {
if (NXT(1) == '/') {
PUSH(XML_OP_ANCESTOR, NULL, NULL);
NEXT;
NEXT;
SKIP_BLANKS;
xmlCompileStepPattern(ctxt);
if (ctxt->error != 0)
goto error;
} else {
PUSH(XML_OP_PARENT, NULL, NULL);
NEXT;
SKIP_BLANKS;
if (CUR == 0) {
ERROR5(NULL, NULL, NULL,
"Incomplete expression '%s'.\n", ctxt->base);
ctxt->error = 1;
goto error;
}
xmlCompileStepPattern(ctxt);
if (ctxt->error != 0)
goto error;
}
}
}
if (CUR != 0) {
ERROR5(NULL, NULL, NULL,
"Failed to compile pattern %s\n", ctxt->base);
ctxt->error = 1;
}
error:
return;
}
/**
* xmlCompileIDCXPathPath:
* @ctxt: the compilation context
*
* Compile the Path Pattern and generates a precompiled
* form suitable for fast matching.
*
* [5] Path ::= ('.//')? ( Step '/' )* ( Step | '@' NameTest )
*/
static void
xmlCompileIDCXPathPath(xmlPatParserContextPtr ctxt) {
SKIP_BLANKS;
if (CUR == '/') {
ERROR5(NULL, NULL, NULL,
"Unexpected selection of the document root in '%s'.\n",
ctxt->base);
goto error;
}
ctxt->comp->flags |= PAT_FROM_CUR;
if (CUR == '.') {
/* "." - "self::node()" */
NEXT;
SKIP_BLANKS;
if (CUR == 0) {
/*
* Selection of the context node.
*/
PUSH(XML_OP_ELEM, NULL, NULL);
return;
}
if (CUR != '/') {
/* TODO: A more meaningful error message. */
ERROR5(NULL, NULL, NULL,
"Unexpected token after '.' in '%s'.\n", ctxt->base);
goto error;
}
/* "./" - "self::node()/" */
NEXT;
SKIP_BLANKS;
if (CUR == '/') {
if (IS_BLANK_CH(PEEKPREV(1))) {
/*
* Disallow "./ /"
*/
ERROR5(NULL, NULL, NULL,
"Unexpected '/' token in '%s'.\n", ctxt->base);
goto error;
}
/* ".//" - "self:node()/descendant-or-self::node()/" */
PUSH(XML_OP_ANCESTOR, NULL, NULL);
NEXT;
SKIP_BLANKS;
}
if (CUR == 0)
goto error_unfinished;
}
/*
* Process steps.
*/
do {
xmlCompileStepPattern(ctxt);
if (ctxt->error != 0)
goto error;
SKIP_BLANKS;
if (CUR != '/')
break;
PUSH(XML_OP_PARENT, NULL, NULL);
NEXT;
SKIP_BLANKS;
if (CUR == '/') {
/*
* Disallow subsequent '//'.
*/
ERROR5(NULL, NULL, NULL,
"Unexpected subsequent '//' in '%s'.\n",
ctxt->base);
goto error;
}
if (CUR == 0)
goto error_unfinished;
} while (CUR != 0);
if (CUR != 0) {
ERROR5(NULL, NULL, NULL,
"Failed to compile expression '%s'.\n", ctxt->base);
ctxt->error = 1;
}
return;
error:
ctxt->error = 1;
return;
error_unfinished:
ctxt->error = 1;
ERROR5(NULL, NULL, NULL,
"Unfinished expression '%s'.\n", ctxt->base);
return;
}
/************************************************************************
* *
* The streaming code *
* *
************************************************************************/
/**
* xmlNewStreamComp:
* @size: the number of expected steps
*
* build a new compiled pattern for streaming
*
* Returns the new structure or NULL in case of error.
*/
static xmlStreamCompPtr
xmlNewStreamComp(int size) {
xmlStreamCompPtr cur;
if (size < 4)
size = 4;
cur = (xmlStreamCompPtr) xmlMalloc(sizeof(xmlStreamComp));
if (cur == NULL) {
ERROR(NULL, NULL, NULL,
"xmlNewStreamComp: malloc failed\n");
return(NULL);
}
memset(cur, 0, sizeof(xmlStreamComp));
cur->steps = (xmlStreamStepPtr) xmlMalloc(size * sizeof(xmlStreamStep));
if (cur->steps == NULL) {
xmlFree(cur);
ERROR(NULL, NULL, NULL,
"xmlNewStreamComp: malloc failed\n");
return(NULL);
}
cur->nbStep = 0;
cur->maxStep = size;
return(cur);
}
/**
* xmlFreeStreamComp:
* @comp: the compiled pattern for streaming
*
* Free the compiled pattern for streaming
*/
static void
xmlFreeStreamComp(xmlStreamCompPtr comp) {
if (comp != NULL) {
if (comp->steps != NULL)
xmlFree(comp->steps);
if (comp->dict != NULL)
xmlDictFree(comp->dict);
xmlFree(comp);
}
}
/**
* xmlStreamCompAddStep:
* @comp: the compiled pattern for streaming
* @name: the first string, the name, or NULL for *
* @ns: the second step, the namespace name
* @flags: the flags for that step
*
* Add a new step to the compiled pattern
*
* Returns -1 in case of error or the step index if successful
*/
static int
xmlStreamCompAddStep(xmlStreamCompPtr comp, const xmlChar *name,
const xmlChar *ns, int nodeType, int flags) {
xmlStreamStepPtr cur;
if (comp->nbStep >= comp->maxStep) {
cur = (xmlStreamStepPtr) xmlRealloc(comp->steps,
comp->maxStep * 2 * sizeof(xmlStreamStep));
if (cur == NULL) {
ERROR(NULL, NULL, NULL,
"xmlNewStreamComp: malloc failed\n");
return(-1);
}
comp->steps = cur;
comp->maxStep *= 2;
}
cur = &comp->steps[comp->nbStep++];
cur->flags = flags;
cur->name = name;
cur->ns = ns;
cur->nodeType = nodeType;
return(comp->nbStep - 1);
}
/**
* xmlStreamCompile:
* @comp: the precompiled pattern
*
* Tries to stream compile a pattern
*
* Returns -1 in case of failure and 0 in case of success.
*/
static int
xmlStreamCompile(xmlPatternPtr comp) {
xmlStreamCompPtr stream;
int i, s = 0, root = 0, flags = 0, prevs = -1;
xmlStepOp step;
if ((comp == NULL) || (comp->steps == NULL))
return(-1);
/*
* special case for .
*/
if ((comp->nbStep == 1) &&
(comp->steps[0].op == XML_OP_ELEM) &&
(comp->steps[0].value == NULL) &&
(comp->steps[0].value2 == NULL)) {
stream = xmlNewStreamComp(0);
if (stream == NULL)
return(-1);
/* Note that the stream will have no steps in this case. */
stream->flags |= XML_STREAM_FINAL_IS_ANY_NODE;
comp->stream = stream;
return(0);
}
stream = xmlNewStreamComp((comp->nbStep / 2) + 1);
if (stream == NULL)
return(-1);
if (comp->dict != NULL) {
stream->dict = comp->dict;
xmlDictReference(stream->dict);
}
i = 0;
if (comp->flags & PAT_FROM_ROOT)
stream->flags |= XML_STREAM_FROM_ROOT;
for (;i < comp->nbStep;i++) {
step = comp->steps[i];
switch (step.op) {
case XML_OP_END:
break;
case XML_OP_ROOT:
if (i != 0)
goto error;
root = 1;
break;
case XML_OP_NS:
s = xmlStreamCompAddStep(stream, NULL, step.value,
XML_ELEMENT_NODE, flags);
if (s < 0)
goto error;
prevs = s;
flags = 0;
break;
case XML_OP_ATTR:
flags |= XML_STREAM_STEP_ATTR;
prevs = -1;
s = xmlStreamCompAddStep(stream,
step.value, step.value2, XML_ATTRIBUTE_NODE, flags);
flags = 0;
if (s < 0)
goto error;
break;
case XML_OP_ELEM:
if ((step.value == NULL) && (step.value2 == NULL)) {
/*
* We have a "." or "self::node()" here.
* Eliminate redundant self::node() tests like in "/./."
* or "//./"
* The only case we won't eliminate is "//.", i.e. if
* self::node() is the last node test and we had
* continuation somewhere beforehand.
*/
if ((comp->nbStep == i + 1) &&
(flags & XML_STREAM_STEP_DESC)) {
/*
* Mark the special case where the expression resolves
* to any type of node.
*/
if (comp->nbStep == i + 1) {
stream->flags |= XML_STREAM_FINAL_IS_ANY_NODE;
}
flags |= XML_STREAM_STEP_NODE;
s = xmlStreamCompAddStep(stream, NULL, NULL,
XML_STREAM_ANY_NODE, flags);
if (s < 0)
goto error;
flags = 0;
/*
* If there was a previous step, mark it to be added to
* the result node-set; this is needed since only
* the last step will be marked as "final" and only
* "final" nodes are added to the resulting set.
*/
if (prevs != -1) {
stream->steps[prevs].flags |= XML_STREAM_STEP_IN_SET;
prevs = -1;
}
break;
} else {
/* Just skip this one. */
continue;
}
}
/* An element node. */
s = xmlStreamCompAddStep(stream, step.value, step.value2,
XML_ELEMENT_NODE, flags);
if (s < 0)
goto error;
prevs = s;
flags = 0;
break;
case XML_OP_CHILD:
/* An element node child. */
s = xmlStreamCompAddStep(stream, step.value, step.value2,
XML_ELEMENT_NODE, flags);
if (s < 0)
goto error;
prevs = s;
flags = 0;
break;
case XML_OP_ALL:
s = xmlStreamCompAddStep(stream, NULL, NULL,
XML_ELEMENT_NODE, flags);
if (s < 0)
goto error;
prevs = s;
flags = 0;
break;
case XML_OP_PARENT:
break;
case XML_OP_ANCESTOR:
/* Skip redundant continuations. */
if (flags & XML_STREAM_STEP_DESC)
break;
flags |= XML_STREAM_STEP_DESC;
/*
* Mark the expression as having "//".
*/
if ((stream->flags & XML_STREAM_DESC) == 0)
stream->flags |= XML_STREAM_DESC;
break;
}
}
if ((! root) && (comp->flags & XML_PATTERN_NOTPATTERN) == 0) {
/*
* If this should behave like a real pattern, we will mark
* the first step as having "//", to be reentrant on every
* tree level.
*/
if ((stream->flags & XML_STREAM_DESC) == 0)
stream->flags |= XML_STREAM_DESC;
if (stream->nbStep > 0) {
if ((stream->steps[0].flags & XML_STREAM_STEP_DESC) == 0)
stream->steps[0].flags |= XML_STREAM_STEP_DESC;
}
}
if (stream->nbStep <= s)
goto error;
stream->steps[s].flags |= XML_STREAM_STEP_FINAL;
if (root)
stream->steps[0].flags |= XML_STREAM_STEP_ROOT;
comp->stream = stream;
return(0);
error:
xmlFreeStreamComp(stream);
return(0);
}
/**
* xmlNewStreamCtxt:
* @size: the number of expected states
*
* build a new stream context
*
* Returns the new structure or NULL in case of error.
*/
static xmlStreamCtxtPtr
xmlNewStreamCtxt(xmlStreamCompPtr stream) {
xmlStreamCtxtPtr cur;
cur = (xmlStreamCtxtPtr) xmlMalloc(sizeof(xmlStreamCtxt));
if (cur == NULL) {
ERROR(NULL, NULL, NULL,
"xmlNewStreamCtxt: malloc failed\n");
return(NULL);
}
memset(cur, 0, sizeof(xmlStreamCtxt));
cur->states = (int *) xmlMalloc(4 * 2 * sizeof(int));
if (cur->states == NULL) {
xmlFree(cur);
ERROR(NULL, NULL, NULL,
"xmlNewStreamCtxt: malloc failed\n");
return(NULL);
}
cur->nbState = 0;
cur->maxState = 4;
cur->level = 0;
cur->comp = stream;
cur->blockLevel = -1;
return(cur);
}
/**
* xmlFreeStreamCtxt:
* @stream: the stream context
*
* Free the stream context
*/
void
xmlFreeStreamCtxt(xmlStreamCtxtPtr stream) {
xmlStreamCtxtPtr next;
while (stream != NULL) {
next = stream->next;
if (stream->states != NULL)
xmlFree(stream->states);
xmlFree(stream);
stream = next;
}
}
/**
* xmlStreamCtxtAddState:
* @comp: the stream context
* @idx: the step index for that streaming state
*
* Add a new state to the stream context
*
* Returns -1 in case of error or the state index if successful
*/
static int
xmlStreamCtxtAddState(xmlStreamCtxtPtr comp, int idx, int level) {
int i;
for (i = 0;i < comp->nbState;i++) {
if (comp->states[2 * i] < 0) {
comp->states[2 * i] = idx;
comp->states[2 * i + 1] = level;
return(i);
}
}
if (comp->nbState >= comp->maxState) {
int *cur;
cur = (int *) xmlRealloc(comp->states,
comp->maxState * 4 * sizeof(int));
if (cur == NULL) {
ERROR(NULL, NULL, NULL,
"xmlNewStreamCtxt: malloc failed\n");
return(-1);
}
comp->states = cur;
comp->maxState *= 2;
}
comp->states[2 * comp->nbState] = idx;
comp->states[2 * comp->nbState++ + 1] = level;
return(comp->nbState - 1);
}
/**
* xmlStreamPushInternal:
* @stream: the stream context
* @name: the current name
* @ns: the namespace name
* @nodeType: the type of the node
*
* Push new data onto the stream. NOTE: if the call xmlPatterncompile()
* indicated a dictionary, then strings for name and ns will be expected
* to come from the dictionary.
* Both @name and @ns being NULL means the / i.e. the root of the document.
* This can also act as a reset.
*
* Returns: -1 in case of error, 1 if the current state in the stream is a
* match and 0 otherwise.
*/
static int
xmlStreamPushInternal(xmlStreamCtxtPtr stream,
const xmlChar *name, const xmlChar *ns,
int nodeType) {
int ret = 0, final = 0, tmp, i, m, match, stepNr, desc;
xmlStreamCompPtr comp;
xmlStreamStep step;
if ((stream == NULL) || (stream->nbState < 0))
return(-1);
while (stream != NULL) {
comp = stream->comp;
if ((nodeType == XML_ELEMENT_NODE) &&
(name == NULL) && (ns == NULL)) {
/* We have a document node here (or a reset). */
stream->nbState = 0;
stream->level = 0;
stream->blockLevel = -1;
if (comp->flags & XML_STREAM_FROM_ROOT) {
if (comp->nbStep == 0) {
/* TODO: We have a "/." here? */
ret = 1;
} else {
if ((comp->nbStep == 1) &&
(comp->steps[0].nodeType == XML_STREAM_ANY_NODE) &&
(comp->steps[0].flags & XML_STREAM_STEP_DESC))
{
/*
* In the case of "//." the document node will match
* as well.
*/
ret = 1;
} else if (comp->steps[0].flags & XML_STREAM_STEP_ROOT) {
if (xmlStreamCtxtAddState(stream, 0, 0) < 0)
return(-1);
}
}
}
stream = stream->next;
continue; /* while */
}
/*
* Fast check for ".".
*/
if (comp->nbStep == 0) {
/*
* / and . are handled at the XPath node set creation
* level by checking min depth
*/
if (stream->flags & XML_PATTERN_XPATH) {
stream = stream->next;
continue; /* while */
}
/*
* For non-pattern like evaluation like XML Schema IDCs
* or traditional XPath expressions, this will match if
* we are at the first level only, otherwise on every level.
*/
if ((nodeType != XML_ATTRIBUTE_NODE) &&
(((stream->flags & XML_PATTERN_NOTPATTERN) == 0) ||
(stream->level == 0))) {
ret = 1;
}
stream->level++;
goto stream_next;
}
if (stream->blockLevel != -1) {
/*
* Skip blocked expressions.
*/
stream->level++;
goto stream_next;
}
if ((nodeType != XML_ELEMENT_NODE) &&
(nodeType != XML_ATTRIBUTE_NODE) &&
((comp->flags & XML_STREAM_FINAL_IS_ANY_NODE) == 0)) {
/*
* No need to process nodes of other types if we don't
* resolve to those types.
* TODO: Do we need to block the context here?
*/
stream->level++;
goto stream_next;
}
/*
* Check evolution of existing states
*/
i = 0;
m = stream->nbState;
while (i < m) {
if ((comp->flags & XML_STREAM_DESC) == 0) {
/*
* If there is no "//", then only the last
* added state is of interest.
*/
stepNr = stream->states[2 * (stream->nbState -1)];
/*
* TODO: Security check, should not happen, remove it.
*/
if (stream->states[(2 * (stream->nbState -1)) + 1] <
stream->level) {
return (-1);
}
desc = 0;
/* loop-stopper */
i = m;
} else {
/*
* If there are "//", then we need to process every "//"
* occurring in the states, plus any other state for this
* level.
*/
stepNr = stream->states[2 * i];
/* TODO: should not happen anymore: dead states */
if (stepNr < 0)
goto next_state;
tmp = stream->states[(2 * i) + 1];
/* skip new states just added */
if (tmp > stream->level)
goto next_state;
/* skip states at ancestor levels, except if "//" */
desc = comp->steps[stepNr].flags & XML_STREAM_STEP_DESC;
if ((tmp < stream->level) && (!desc))
goto next_state;
}
/*
* Check for correct node-type.
*/
step = comp->steps[stepNr];
if (step.nodeType != nodeType) {
if (step.nodeType == XML_ATTRIBUTE_NODE) {
/*
* Block this expression for deeper evaluation.
*/
if ((comp->flags & XML_STREAM_DESC) == 0)
stream->blockLevel = stream->level +1;
goto next_state;
} else if (step.nodeType != XML_STREAM_ANY_NODE)
goto next_state;
}
/*
* Compare local/namespace-name.
*/
match = 0;
if (step.nodeType == XML_STREAM_ANY_NODE) {
match = 1;
} else if (step.name == NULL) {
if (step.ns == NULL) {
/*
* This lets through all elements/attributes.
*/
match = 1;
} else if (ns != NULL)
match = xmlStrEqual(step.ns, ns);
} else if (((step.ns != NULL) == (ns != NULL)) &&
(name != NULL) &&
(step.name[0] == name[0]) &&
xmlStrEqual(step.name, name) &&
((step.ns == ns) || xmlStrEqual(step.ns, ns)))
{
match = 1;
}
#if 0
/*
* TODO: Pointer comparison won't work, since not guaranteed that the given
* values are in the same dict; especially if it's the namespace name,
* normally coming from ns->href. We need a namespace dict mechanism !
*/
} else if (comp->dict) {
if (step.name == NULL) {
if (step.ns == NULL)
match = 1;
else
match = (step.ns == ns);
} else {
match = ((step.name == name) && (step.ns == ns));
}
#endif /* if 0 ------------------------------------------------------- */
if (match) {
final = step.flags & XML_STREAM_STEP_FINAL;
if (final) {
ret = 1;
} else if (xmlStreamCtxtAddState(stream, stepNr + 1,
stream->level + 1) < 0) {
return(-1);
}
if ((ret != 1) && (step.flags & XML_STREAM_STEP_IN_SET)) {
/*
* Check if we have a special case like "foo/bar//.", where
* "foo" is selected as well.
*/
ret = 1;
}
}
if (((comp->flags & XML_STREAM_DESC) == 0) &&
((! match) || final)) {
/*
* Mark this expression as blocked for any evaluation at
* deeper levels. Note that this includes "/foo"
* expressions if the *pattern* behaviour is used.
*/
stream->blockLevel = stream->level +1;
}
next_state:
i++;
}
stream->level++;
/*
* Re/enter the expression.
* Don't reenter if it's an absolute expression like "/foo",
* except "//foo".
*/
step = comp->steps[0];
if (step.flags & XML_STREAM_STEP_ROOT)
goto stream_next;
desc = step.flags & XML_STREAM_STEP_DESC;
if (stream->flags & XML_PATTERN_NOTPATTERN) {
/*
* Re/enter the expression if it is a "descendant" one,
* or if we are at the 1st level of evaluation.
*/
if (stream->level == 1) {
if (XML_STREAM_XS_IDC(stream)) {
/*
* XS-IDC: The missing "self::node()" will always
* match the first given node.
*/
goto stream_next;
} else
goto compare;
}
/*
* A "//" is always reentrant.
*/
if (desc)
goto compare;
/*
* XS-IDC: Process the 2nd level, since the missing
* "self::node()" is responsible for the 2nd level being
* the real start level.
*/
if ((stream->level == 2) && XML_STREAM_XS_IDC(stream))
goto compare;
goto stream_next;
}
compare:
/*
* Check expected node-type.
*/
if (step.nodeType != nodeType) {
if (nodeType == XML_ATTRIBUTE_NODE)
goto stream_next;
else if (step.nodeType != XML_STREAM_ANY_NODE)
goto stream_next;
}
/*
* Compare local/namespace-name.
*/
match = 0;
if (step.nodeType == XML_STREAM_ANY_NODE) {
match = 1;
} else if (step.name == NULL) {
if (step.ns == NULL) {
/*
* This lets through all elements/attributes.
*/
match = 1;
} else if (ns != NULL)
match = xmlStrEqual(step.ns, ns);
} else if (((step.ns != NULL) == (ns != NULL)) &&
(name != NULL) &&
(step.name[0] == name[0]) &&
xmlStrEqual(step.name, name) &&
((step.ns == ns) || xmlStrEqual(step.ns, ns)))
{
match = 1;
}
final = step.flags & XML_STREAM_STEP_FINAL;
if (match) {
if (final) {
ret = 1;
} else if (xmlStreamCtxtAddState(stream, 1, stream->level) < 0) {
return(-1);
}
if ((ret != 1) && (step.flags & XML_STREAM_STEP_IN_SET)) {
/*
* Check if we have a special case like "foo//.", where
* "foo" is selected as well.
*/
ret = 1;
}
}
if (((comp->flags & XML_STREAM_DESC) == 0) &&
((! match) || final)) {
/*
* Mark this expression as blocked for any evaluation at
* deeper levels.
*/
stream->blockLevel = stream->level;
}
stream_next:
stream = stream->next;
} /* while stream != NULL */
return(ret);
}
/**
* xmlStreamPush:
* @stream: the stream context
* @name: the current name
* @ns: the namespace name
*
* Push new data onto the stream. NOTE: if the call xmlPatterncompile()
* indicated a dictionary, then strings for name and ns will be expected
* to come from the dictionary.
* Both @name and @ns being NULL means the / i.e. the root of the document.
* This can also act as a reset.
* Otherwise the function will act as if it has been given an element-node.
*
* Returns: -1 in case of error, 1 if the current state in the stream is a
* match and 0 otherwise.
*/
int
xmlStreamPush(xmlStreamCtxtPtr stream,
const xmlChar *name, const xmlChar *ns) {
return (xmlStreamPushInternal(stream, name, ns, XML_ELEMENT_NODE));
}
/**
* xmlStreamPushNode:
* @stream: the stream context
* @name: the current name
* @ns: the namespace name
* @nodeType: the type of the node being pushed
*
* Push new data onto the stream. NOTE: if the call xmlPatterncompile()
* indicated a dictionary, then strings for name and ns will be expected
* to come from the dictionary.
* Both @name and @ns being NULL means the / i.e. the root of the document.
* This can also act as a reset.
* Different from xmlStreamPush() this function can be fed with nodes of type:
* element-, attribute-, text-, cdata-section-, comment- and
* processing-instruction-node.
*
* Returns: -1 in case of error, 1 if the current state in the stream is a
* match and 0 otherwise.
*/
int
xmlStreamPushNode(xmlStreamCtxtPtr stream,
const xmlChar *name, const xmlChar *ns,
int nodeType)
{
return (xmlStreamPushInternal(stream, name, ns,
nodeType));
}
/**
* xmlStreamPushAttr:
* @stream: the stream context
* @name: the current name
* @ns: the namespace name
*
* Push new attribute data onto the stream. NOTE: if the call xmlPatterncompile()
* indicated a dictionary, then strings for name and ns will be expected
* to come from the dictionary.
* Both @name and @ns being NULL means the / i.e. the root of the document.
* This can also act as a reset.
* Otherwise the function will act as if it has been given an attribute-node.
*
* Returns: -1 in case of error, 1 if the current state in the stream is a
* match and 0 otherwise.
*/
int
xmlStreamPushAttr(xmlStreamCtxtPtr stream,
const xmlChar *name, const xmlChar *ns) {
return (xmlStreamPushInternal(stream, name, ns, XML_ATTRIBUTE_NODE));
}
/**
* xmlStreamPop:
* @stream: the stream context
*
* push one level from the stream.
*
* Returns: -1 in case of error, 0 otherwise.
*/
int
xmlStreamPop(xmlStreamCtxtPtr stream) {
int i, lev;
if (stream == NULL)
return(-1);
while (stream != NULL) {
/*
* Reset block-level.
*/
if (stream->blockLevel == stream->level)
stream->blockLevel = -1;
/*
* stream->level can be zero when XML_FINAL_IS_ANY_NODE is set
* (see the thread at
* http://mail.gnome.org/archives/xslt/2008-July/msg00027.html)
*/
if (stream->level)
stream->level--;
/*
* Check evolution of existing states
*/
for (i = stream->nbState -1; i >= 0; i--) {
/* discard obsoleted states */
lev = stream->states[(2 * i) + 1];
if (lev > stream->level)
stream->nbState--;
if (lev <= stream->level)
break;
}
stream = stream->next;
}
return(0);
}
/**
* xmlStreamWantsAnyNode:
* @streamCtxt: the stream context
*
* Query if the streaming pattern additionally needs to be fed with
* text-, cdata-section-, comment- and processing-instruction-nodes.
* If the result is 0 then only element-nodes and attribute-nodes
* need to be pushed.
*
* Returns: 1 in case of need of nodes of the above described types,
* 0 otherwise. -1 on API errors.
*/
int
xmlStreamWantsAnyNode(xmlStreamCtxtPtr streamCtxt)
{
if (streamCtxt == NULL)
return(-1);
while (streamCtxt != NULL) {
if (streamCtxt->comp->flags & XML_STREAM_FINAL_IS_ANY_NODE)
return(1);
streamCtxt = streamCtxt->next;
}
return(0);
}
/************************************************************************
* *
* The public interfaces *
* *
************************************************************************/
/**
* xmlPatternCompileSafe:
* @pattern: the pattern to compile
* @dict: an optional dictionary for interned strings
* @flags: compilation flags, see xmlPatternFlags
* @namespaces: the prefix definitions, array of [URI, prefix] or NULL
* @patternOut: output pattern
*
* Compile a pattern.
*
* Available since 2.13.0.
*
* Returns 0 on success, 1 on error, -1 if a memory allocation failed.
*/
int
xmlPatternCompileSafe(const xmlChar *pattern, xmlDict *dict, int flags,
const xmlChar **namespaces, xmlPatternPtr *patternOut) {
xmlPatternPtr ret = NULL, cur;
xmlPatParserContextPtr ctxt = NULL;
const xmlChar *or, *start;
xmlChar *tmp = NULL;
int type = 0;
int streamable = 1;
int error;
if (patternOut == NULL)
return(1);
if (pattern == NULL) {
error = 1;
goto error;
}
start = pattern;
or = start;
while (*or != 0) {
tmp = NULL;
while ((*or != 0) && (*or != '|')) or++;
if (*or == 0)
ctxt = xmlNewPatParserContext(start, dict, namespaces);
else {
tmp = xmlStrndup(start, or - start);
if (tmp != NULL) {
ctxt = xmlNewPatParserContext(tmp, dict, namespaces);
}
or++;
}
if (ctxt == NULL) {
error = -1;
goto error;
}
cur = xmlNewPattern();
if (cur == NULL) {
error = -1;
goto error;
}
/*
* Assign string dict.
*/
if (dict) {
cur->dict = dict;
xmlDictReference(dict);
}
if (ret == NULL)
ret = cur;
else {
cur->next = ret->next;
ret->next = cur;
}
cur->flags = flags;
ctxt->comp = cur;
if (XML_STREAM_XS_IDC(cur))
xmlCompileIDCXPathPath(ctxt);
else
xmlCompilePathPattern(ctxt);
if (ctxt->error != 0) {
error = ctxt->error;
goto error;
}
xmlFreePatParserContext(ctxt);
ctxt = NULL;
if (streamable) {
if (type == 0) {
type = cur->flags & (PAT_FROM_ROOT | PAT_FROM_CUR);
} else if (type == PAT_FROM_ROOT) {
if (cur->flags & PAT_FROM_CUR)
streamable = 0;
} else if (type == PAT_FROM_CUR) {
if (cur->flags & PAT_FROM_ROOT)
streamable = 0;
}
}
if (streamable) {
error = xmlStreamCompile(cur);
if (error != 0)
goto error;
}
error = xmlReversePattern(cur);
if (error != 0)
goto error;
if (tmp != NULL) {
xmlFree(tmp);
tmp = NULL;
}
start = or;
}
if (streamable == 0) {
cur = ret;
while (cur != NULL) {
if (cur->stream != NULL) {
xmlFreeStreamComp(cur->stream);
cur->stream = NULL;
}
cur = cur->next;
}
}
*patternOut = ret;
return(0);
error:
if (ctxt != NULL) xmlFreePatParserContext(ctxt);
if (ret != NULL) xmlFreePattern(ret);
if (tmp != NULL) xmlFree(tmp);
*patternOut = NULL;
return(error);
}
/**
* xmlPatterncompile:
* @pattern: the pattern to compile
* @dict: an optional dictionary for interned strings
* @flags: compilation flags, see xmlPatternFlags
* @namespaces: the prefix definitions, array of [URI, prefix] or NULL
*
* Compile a pattern.
*
* Returns the compiled form of the pattern or NULL in case of error
*/
xmlPatternPtr
xmlPatterncompile(const xmlChar *pattern, xmlDict *dict, int flags,
const xmlChar **namespaces) {
xmlPatternPtr ret;
xmlPatternCompileSafe(pattern, dict, flags, namespaces, &ret);
return(ret);
}
/**
* xmlPatternMatch:
* @comp: the precompiled pattern
* @node: a node
*
* Test whether the node matches the pattern
*
* Returns 1 if it matches, 0 if it doesn't and -1 in case of failure
*/
int
xmlPatternMatch(xmlPatternPtr comp, xmlNodePtr node)
{
int ret = 0;
if ((comp == NULL) || (node == NULL))
return(-1);
while (comp != NULL) {
ret = xmlPatMatch(comp, node);
if (ret != 0)
return(ret);
comp = comp->next;
}
return(ret);
}
/**
* xmlPatternGetStreamCtxt:
* @comp: the precompiled pattern
*
* Get a streaming context for that pattern
* Use xmlFreeStreamCtxt to free the context.
*
* Returns a pointer to the context or NULL in case of failure
*/
xmlStreamCtxtPtr
xmlPatternGetStreamCtxt(xmlPatternPtr comp)
{
xmlStreamCtxtPtr ret = NULL, cur;
if ((comp == NULL) || (comp->stream == NULL))
return(NULL);
while (comp != NULL) {
if (comp->stream == NULL)
goto failed;
cur = xmlNewStreamCtxt(comp->stream);
if (cur == NULL)
goto failed;
if (ret == NULL)
ret = cur;
else {
cur->next = ret->next;
ret->next = cur;
}
cur->flags = comp->flags;
comp = comp->next;
}
return(ret);
failed:
xmlFreeStreamCtxt(ret);
return(NULL);
}
/**
* xmlPatternStreamable:
* @comp: the precompiled pattern
*
* Check if the pattern is streamable i.e. xmlPatternGetStreamCtxt()
* should work.
*
* Returns 1 if streamable, 0 if not and -1 in case of error.
*/
int
xmlPatternStreamable(xmlPatternPtr comp) {
if (comp == NULL)
return(-1);
while (comp != NULL) {
if (comp->stream == NULL)
return(0);
comp = comp->next;
}
return(1);
}
/**
* xmlPatternMaxDepth:
* @comp: the precompiled pattern
*
* Check the maximum depth reachable by a pattern
*
* Returns -2 if no limit (using //), otherwise the depth,
* and -1 in case of error
*/
int
xmlPatternMaxDepth(xmlPatternPtr comp) {
int ret = 0, i;
if (comp == NULL)
return(-1);
while (comp != NULL) {
if (comp->stream == NULL)
return(-1);
for (i = 0;i < comp->stream->nbStep;i++)
if (comp->stream->steps[i].flags & XML_STREAM_STEP_DESC)
return(-2);
if (comp->stream->nbStep > ret)
ret = comp->stream->nbStep;
comp = comp->next;
}
return(ret);
}
/**
* xmlPatternMinDepth:
* @comp: the precompiled pattern
*
* Check the minimum depth reachable by a pattern, 0 mean the / or . are
* part of the set.
*
* Returns -1 in case of error otherwise the depth,
*
*/
int
xmlPatternMinDepth(xmlPatternPtr comp) {
int ret = 12345678;
if (comp == NULL)
return(-1);
while (comp != NULL) {
if (comp->stream == NULL)
return(-1);
if (comp->stream->nbStep < ret)
ret = comp->stream->nbStep;
if (ret == 0)
return(0);
comp = comp->next;
}
return(ret);
}
/**
* xmlPatternFromRoot:
* @comp: the precompiled pattern
*
* Check if the pattern must be looked at from the root.
*
* Returns 1 if true, 0 if false and -1 in case of error
*/
int
xmlPatternFromRoot(xmlPatternPtr comp) {
if (comp == NULL)
return(-1);
while (comp != NULL) {
if (comp->stream == NULL)
return(-1);
if (comp->flags & PAT_FROM_ROOT)
return(1);
comp = comp->next;
}
return(0);
}
#endif /* LIBXML_PATTERN_ENABLED */
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