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pattern.c
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pattern.c
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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;