tree.c

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/*
 * tree.c : implementation of access function for an XML tree.
 *
 * References:
 *   XHTML 1.0 W3C REC: http://www.w3.org/TR/2002/REC-xhtml1-20020801/
 *
 * See Copyright for the status of this software.
 *
 * [e-mail]
 *
 */

#define IN_LIBXML
#include "libxml.h"

#include <string.h> /* for memset() only ! */

#ifdef HAVE_CTYPE_H
#include <ctype.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_ZLIB_H
#include <zlib.h>
#endif

#include <libxml/xmlmemory.h>
#include <libxml/tree.h>
#include <libxml/parser.h>
#include <libxml/uri.h>
#include <libxml/entities.h>
#include <libxml/valid.h>
#include <libxml/xmlerror.h>
#include <libxml/parserInternals.h>
#include <libxml/globals.h>
#ifdef LIBXML_HTML_ENABLED
#include <libxml/HTMLtree.h>
#endif
#ifdef LIBXML_DEBUG_ENABLED
#include <libxml/debugXML.h>
#endif

int __xmlRegisterCallbacks = 0;

xmlNsPtr xmlNewReconciliedNs(xmlDocPtr doc, xmlNodePtr tree, xmlNsPtr ns);

/************************************************************************
 *									*
 * 		Tree memory error handler				*
 *									*
 ************************************************************************/
/**
 * xmlTreeErrMemory:
 * @extra:  extra informations
 *
 * Handle an out of memory condition
 */
static void
xmlTreeErrMemory(const char *extra)
{
    __xmlSimpleError(XML_FROM_TREE, XML_ERR_NO_MEMORY, NULL, NULL, extra);
}

/**
 * xmlTreeErr:
 * @code:  the error number
 * @extra:  extra informations
 *
 * Handle an out of memory condition
 */
static void
xmlTreeErr(int code, xmlNodePtr node, const char *extra)
{
    const char *msg = NULL;

    switch(code) {
        case XML_TREE_INVALID_HEX:
	    msg = "invalid hexadecimal character value\n";
	    break;
	case XML_TREE_INVALID_DEC:
	    msg = "invalid decimal character value\n";
	    break;
	case XML_TREE_UNTERMINATED_ENTITY:
	    msg = "unterminated entity reference %15s\n";
	    break;
	default:
	    msg = "unexpected error number\n";
    }
    __xmlSimpleError(XML_FROM_TREE, code, node, msg, extra);
}

/************************************************************************
 *									*
 * 		A few static variables and macros			*
 *									*
 ************************************************************************/
/* #undef xmlStringText */
const xmlChar xmlStringText[] = { 't', 'e', 'x', 't', 0 };
/* #undef xmlStringTextNoenc */
const xmlChar xmlStringTextNoenc[] =
              { 't', 'e', 'x', 't', 'n', 'o', 'e', 'n', 'c', 0 };
/* #undef xmlStringComment */
const xmlChar xmlStringComment[] = { 'c', 'o', 'm', 'm', 'e', 'n', 't', 0 };

static int xmlCompressMode = 0;
static int xmlCheckDTD = 1;

#define UPDATE_LAST_CHILD_AND_PARENT(n) if ((n) != NULL) {		\
    xmlNodePtr ulccur = (n)->children;					\
    if (ulccur == NULL) {						\
        (n)->last = NULL;						\
    } else {								\
        while (ulccur->next != NULL) {					\
	       	ulccur->parent = (n);					\
		ulccur = ulccur->next;					\
	}								\
	ulccur->parent = (n);						\
	(n)->last = ulccur;						\
}}

/* #define DEBUG_BUFFER */
/* #define DEBUG_TREE */

/************************************************************************
 *									*
 *		Functions to move to entities.c once the 		*
 *		API freeze is smoothen and they can be made public.	*
 *									*
 ************************************************************************/
#include <libxml/hash.h>
 
#ifdef LIBXML_TREE_ENABLED
/**
 * xmlGetEntityFromDtd:
 * @dtd:  A pointer to the DTD to search
 * @name:  The entity name
 *
 * Do an entity lookup in the DTD entity hash table and
 * return the corresponding entity, if found.
 * 
 * Returns A pointer to the entity structure or NULL if not found.
 */
static xmlEntityPtr
xmlGetEntityFromDtd(xmlDtdPtr dtd, const xmlChar *name) {
    xmlEntitiesTablePtr table;
    
    if((dtd != NULL) && (dtd->entities != NULL)) {
	table = (xmlEntitiesTablePtr) dtd->entities;
	return((xmlEntityPtr) xmlHashLookup(table, name));
    	/* return(xmlGetEntityFromTable(table, name)); */
    }
    return(NULL);
}
/**
 * xmlGetParameterEntityFromDtd:
 * @dtd:  A pointer to the DTD to search
 * @name:  The entity name
 * 
 * Do an entity lookup in the DTD pararmeter entity hash table and
 * return the corresponding entity, if found.
 *
 * Returns A pointer to the entity structure or NULL if not found.
 */
static xmlEntityPtr
xmlGetParameterEntityFromDtd(xmlDtdPtr dtd, const xmlChar *name) {
    xmlEntitiesTablePtr table;
    
    if ((dtd != NULL) && (dtd->pentities != NULL)) {
	table = (xmlEntitiesTablePtr) dtd->pentities;
	return((xmlEntityPtr) xmlHashLookup(table, name));
	/* return(xmlGetEntityFromTable(table, name)); */
    }
    return(NULL);
}
#endif /* LIBXML_TREE_ENABLED */

/************************************************************************
 *									*
 *			QName handling helper				*
 *									*
 ************************************************************************/

/**
 * xmlBuildQName:
 * @ncname:  the Name
 * @prefix:  the prefix
 * @memory:  preallocated memory
 * @len:  preallocated memory length
 *
 * Builds the QName @prefix:@ncname in @memory if there is enough space
 * and prefix is not NULL nor empty, otherwise allocate a new string.
 * If prefix is NULL or empty it returns ncname.
 *
 * Returns the new string which must be freed by the caller if different from
 *         @memory and @ncname or NULL in case of error
 */
xmlChar *
xmlBuildQName(const xmlChar *ncname, const xmlChar *prefix,
	      xmlChar *memory, int len) {
    int lenn, lenp;
    xmlChar *ret;

    if (ncname == NULL) return(NULL);
    if (prefix == NULL) return((xmlChar *) ncname);

    lenn = strlen((char *) ncname);
    lenp = strlen((char *) prefix);

    if ((memory == NULL) || (len < lenn + lenp + 2)) {
	ret = (xmlChar *) xmlMallocAtomic(lenn + lenp + 2);
	if (ret == NULL) {
	    xmlTreeErrMemory("building QName");
	    return(NULL);
	}
    } else {
	ret = memory;
    }
    memcpy(&ret[0], prefix, lenp);
    ret[lenp] = ':';
    memcpy(&ret[lenp + 1], ncname, lenn);
    ret[lenn + lenp + 1] = 0;
    return(ret);
}

/**
 * xmlSplitQName2:
 * @name:  the full QName
 * @prefix:  a xmlChar ** 
 *
 * parse an XML qualified name string
 *
 * [NS 5] QName ::= (Prefix ':')? LocalPart
 *
 * [NS 6] Prefix ::= NCName
 *
 * [NS 7] LocalPart ::= NCName
 *
 * Returns NULL if not a QName, otherwise the local part, and prefix
 *   is updated to get the Prefix if any.
 */

xmlChar *
xmlSplitQName2(const xmlChar *name, xmlChar **prefix) {
    int len = 0;
    xmlChar *ret = NULL;

    if (prefix == NULL) return(NULL);
    *prefix = NULL;
    if (name == NULL) return(NULL);

#ifndef XML_XML_NAMESPACE
    /* xml: prefix is not really a namespace */
    if ((name[0] == 'x') && (name[1] == 'm') &&
        (name[2] == 'l') && (name[3] == ':'))
	return(NULL);
#endif

    /* nasty but valid */
    if (name[0] == ':')
	return(NULL);

    /*
     * we are not trying to validate but just to cut, and yes it will
     * work even if this is as set of UTF-8 encoded chars
     */
    while ((name[len] != 0) && (name[len] != ':')) 
	len++;
    
    if (name[len] == 0)
	return(NULL);

    *prefix = xmlStrndup(name, len);
    if (*prefix == NULL) {
	xmlTreeErrMemory("QName split");
	return(NULL);
    }
    ret = xmlStrdup(&name[len + 1]);
    if (ret == NULL) {
	xmlTreeErrMemory("QName split");
	if (*prefix != NULL) {
	    xmlFree(*prefix);
	    *prefix = NULL;
	}
	return(NULL);
    }

    return(ret);
}

/**
 * xmlSplitQName3:
 * @name:  the full QName
 * @len: an int *
 *
 * parse an XML qualified name string,i
 *
 * returns NULL if it is not a Qualified Name, otherwise, update len
 *         with the lenght in byte of the prefix and return a pointer
 */

const xmlChar *
xmlSplitQName3(const xmlChar *name, int *len) {
    int l = 0;

    if (name == NULL) return(NULL);
    if (len == NULL) return(NULL);

    /* nasty but valid */
    if (name[0] == ':')
	return(NULL);

    /*
     * we are not trying to validate but just to cut, and yes it will
     * work even if this is as set of UTF-8 encoded chars
     */
    while ((name[l] != 0) && (name[l] != ':')) 
	l++;
    
    if (name[l] == 0)
	return(NULL);

    *len = l;

    return(&name[l+1]);
}

/************************************************************************
 *									*
 *		Check Name, NCName and QName strings			*
 *									*
 ************************************************************************/
 
#define CUR_SCHAR(s, l) xmlStringCurrentChar(NULL, s, &l)

#if defined(LIBXML_TREE_ENABLED) || defined(LIBXML_XPATH_ENABLED) || defined(LIBXML_SCHEMAS_ENABLED) || defined(LIBXML_DEBUG_ENABLED) || defined (LIBXML_HTML_ENABLED)
/**
 * xmlValidateNCName:
 * @value: the value to check
 * @space: allow spaces in front and end of the string
 *
 * Check that a value conforms to the lexical space of NCName
 *
 * Returns 0 if this validates, a positive error code number otherwise
 *         and -1 in case of internal or API error.
 */
int
xmlValidateNCName(const xmlChar *value, int space) {
    const xmlChar *cur = value;
    int c,l;

    if (value == NULL)
        return(-1);

    /*
     * First quick algorithm for ASCII range
     */
    if (space)
	while (IS_BLANK_CH(*cur)) cur++;
    if (((*cur >= 'a') && (*cur <= 'z')) || ((*cur >= 'A') && (*cur <= 'Z')) ||
	(*cur == '_'))
	cur++;
    else
	goto try_complex;
    while (((*cur >= 'a') && (*cur <= 'z')) ||
	   ((*cur >= 'A') && (*cur <= 'Z')) ||
	   ((*cur >= '0') && (*cur <= '9')) ||
	   (*cur == '_') || (*cur == '-') || (*cur == '.'))
	cur++;
    if (space)
	while (IS_BLANK_CH(*cur)) cur++;
    if (*cur == 0)
	return(0);

try_complex:
    /*
     * Second check for chars outside the ASCII range
     */
    cur = value;
    c = CUR_SCHAR(cur, l);
    if (space) {
	while (IS_BLANK(c)) {
	    cur += l;
	    c = CUR_SCHAR(cur, l);
	}
    }
    if ((!IS_LETTER(c)) && (c != '_'))
	return(1);
    cur += l;
    c = CUR_SCHAR(cur, l);
    while (IS_LETTER(c) || IS_DIGIT(c) || (c == '.') ||
	   (c == '-') || (c == '_') || IS_COMBINING(c) ||
	   IS_EXTENDER(c)) {
	cur += l;
	c = CUR_SCHAR(cur, l);
    }
    if (space) {
	while (IS_BLANK(c)) {
	    cur += l;
	    c = CUR_SCHAR(cur, l);
	}
    }
    if (c != 0)
	return(1);

    return(0);
}
#endif

#if defined(LIBXML_TREE_ENABLED) || defined(LIBXML_SCHEMAS_ENABLED)
/**
 * xmlValidateQName:
 * @value: the value to check
 * @space: allow spaces in front and end of the string
 *
 * Check that a value conforms to the lexical space of QName
 *
 * Returns 0 if this validates, a positive error code number otherwise
 *         and -1 in case of internal or API error.
 */
int
xmlValidateQName(const xmlChar *value, int space) {
    const xmlChar *cur = value;
    int c,l;

    if (value == NULL)
        return(-1);
    /*
     * First quick algorithm for ASCII range
     */
    if (space)
	while (IS_BLANK_CH(*cur)) cur++;
    if (((*cur >= 'a') && (*cur <= 'z')) || ((*cur >= 'A') && (*cur <= 'Z')) ||
	(*cur == '_'))
	cur++;
    else
	goto try_complex;
    while (((*cur >= 'a') && (*cur <= 'z')) ||
	   ((*cur >= 'A') && (*cur <= 'Z')) ||
	   ((*cur >= '0') && (*cur <= '9')) ||
	   (*cur == '_') || (*cur == '-') || (*cur == '.'))
	cur++;
    if (*cur == ':') {
	cur++;
	if (((*cur >= 'a') && (*cur <= 'z')) ||
	    ((*cur >= 'A') && (*cur <= 'Z')) ||
	    (*cur == '_'))
	    cur++;
	else
	    goto try_complex;
	while (((*cur >= 'a') && (*cur <= 'z')) ||
	       ((*cur >= 'A') && (*cur <= 'Z')) ||
	       ((*cur >= '0') && (*cur <= '9')) ||
	       (*cur == '_') || (*cur == '-') || (*cur == '.'))
	    cur++;
    }
    if (space)
	while (IS_BLANK_CH(*cur)) cur++;
    if (*cur == 0)
	return(0);

try_complex:
    /*
     * Second check for chars outside the ASCII range
     */
    cur = value;
    c = CUR_SCHAR(cur, l);
    if (space) {
	while (IS_BLANK(c)) {
	    cur += l;
	    c = CUR_SCHAR(cur, l);
	}
    }
    if ((!IS_LETTER(c)) && (c != '_'))
	return(1);
    cur += l;
    c = CUR_SCHAR(cur, l);
    while (IS_LETTER(c) || IS_DIGIT(c) || (c == '.') ||
	   (c == '-') || (c == '_') || IS_COMBINING(c) ||
	   IS_EXTENDER(c)) {
	cur += l;
	c = CUR_SCHAR(cur, l);
    }
    if (c == ':') {
	cur += l;
	c = CUR_SCHAR(cur, l);
	if ((!IS_LETTER(c)) && (c != '_'))
	    return(1);
	cur += l;
	c = CUR_SCHAR(cur, l);
	while (IS_LETTER(c) || IS_DIGIT(c) || (c == '.') ||
	       (c == '-') || (c == '_') || IS_COMBINING(c) ||
	       IS_EXTENDER(c)) {
	    cur += l;
	    c = CUR_SCHAR(cur, l);
	}
    }
    if (space) {
	while (IS_BLANK(c)) {
	    cur += l;
	    c = CUR_SCHAR(cur, l);
	}
    }
    if (c != 0)
	return(1);