/*
*******************************************************************************
*
* Copyright (C) 2004-2010, International Business Machines
* Corporation and others. All Rights Reserved.
*
*******************************************************************************
* file name: xmlparser.cpp
* encoding: US-ASCII
* tab size: 8 (not used)
* indentation:4
*
* created on: 2004jul21
* created by: Andy Heninger
*/
#include <stdio.h>
#include "unicode/uchar.h"
#include "unicode/ucnv.h"
#include "unicode/regex.h"
#include "filestrm.h"
#include "xmlparser.h"
#if !UCONFIG_NO_REGULAR_EXPRESSIONS && !UCONFIG_NO_CONVERSION
// character constants
enum {
x_QUOT=0x22,
x_AMP=0x26,
x_APOS=0x27,
x_LT=0x3c,
x_GT=0x3e,
x_l=0x6c
};
#define XML_SPACES "[ \\u0009\\u000d\\u000a]"
// XML #4
#define XML_NAMESTARTCHAR "[[A-Z]:_[a-z][\\u00c0-\\u00d6][\\u00d8-\\u00f6]" \
"[\\u00f8-\\u02ff][\\u0370-\\u037d][\\u037F-\\u1FFF][\\u200C-\\u200D]" \
"[\\u2070-\\u218F][\\u2C00-\\u2FEF][\\u3001-\\uD7FF][\\uF900-\\uFDCF]" \
"[\\uFDF0-\\uFFFD][\\U00010000-\\U000EFFFF]]"
// XML #5
#define XML_NAMECHAR "[" XML_NAMESTARTCHAR "\\-.[0-9]\\u00b7[\\u0300-\\u036f][\\u203f-\\u2040]]"
// XML #6
#define XML_NAME XML_NAMESTARTCHAR "(?:" XML_NAMECHAR ")*"
U_NAMESPACE_BEGIN
UOBJECT_DEFINE_RTTI_IMPLEMENTATION(UXMLParser)
UOBJECT_DEFINE_RTTI_IMPLEMENTATION(UXMLElement)
//
// UXMLParser constructor. Mostly just initializes the ICU regexes that are
// used for parsing.
//
UXMLParser::UXMLParser(UErrorCode &status) :
// XML Declaration. XML Production #23.
// example: "<?xml version=1.0 encoding="utf-16" ?>
// This is a sloppy implementation - just look for the leading <?xml and the closing ?>
// allow for a possible leading BOM.
mXMLDecl(UnicodeString("(?s)\\uFEFF?<\\?xml.+?\\?>", -1, US_INV), 0, status),
// XML Comment production #15
// example: "<!-- whatever -->
// note, does not detect an illegal "--" within comments
mXMLComment(UnicodeString("(?s)<!--.+?-->", -1, US_INV), 0, status),
// XML Spaces
// production [3]
mXMLSP(UnicodeString(XML_SPACES "+", -1, US_INV), 0, status),
// XML Doctype decl production #28
// example "<!DOCTYPE foo SYSTEM "somewhere" >
// or "<!DOCTYPE foo [internal dtd]>
// TODO: we don't actually parse the DOCTYPE or internal subsets.
// Some internal dtd subsets could confuse this simple-minded
// attempt at skipping over them, specifically, occcurences
// of closeing square brackets. These could appear in comments,
// or in parameter entity declarations, for example.
mXMLDoctype(UnicodeString(
"(?s)<!DOCTYPE.*?(>|\\[.*?\\].*?>)", -1, US_INV
), 0, status),
// XML PI production #16
// example "<?target stuff?>
mXMLPI(UnicodeString("(?s)<\\?.+?\\?>", -1, US_INV), 0, status),
// XML Element Start Productions #40, #41
// example <foo att1='abc' att2="d e f" >
// capture #1: the tag name
//
mXMLElemStart (UnicodeString("(?s)<(" XML_NAME ")" // match "<tag_name"
"(?:"
XML_SPACES "+" XML_NAME XML_SPACES "*=" XML_SPACES "*" // match "ATTR_NAME = "
"(?:(?:\\\'[^<\\\']*?\\\')|(?:\\\"[^<\\\"]*?\\\"))" // match '"attribute value"'
")*" // * for zero or more attributes.
XML_SPACES "*?>", -1, US_INV), 0, status), // match " >"
// XML Element End production #42
// example </foo>
mXMLElemEnd (UnicodeString("</(" XML_NAME ")" XML_SPACES "*>", -1, US_INV), 0, status),
// XML Element Empty production #44
// example <foo att1="abc" att2="d e f" />
mXMLElemEmpty (UnicodeString("(?s)<(" XML_NAME ")" // match "<tag_name"
"(?:"
XML_SPACES "+" XML_NAME XML_SPACES "*=" XML_SPACES "*" // match "ATTR_NAME = "
"(?:(?:\\\'[^<\\\']*?\\\')|(?:\\\"[^<\\\"]*?\\\"))" // match '"attribute value"'
")*" // * for zero or more attributes.
XML_SPACES "*?/>", -1, US_INV), 0, status), // match " />"
// XMLCharData. Everything but '<'. Note that & will be dealt with later.
mXMLCharData(UnicodeString("(?s)[^<]*", -1, US_INV), 0, status),
// Attribute name = "value". XML Productions 10, 40/41
// Capture group 1 is name,
// 2 is the attribute value, including the quotes.
//
// Note that attributes are scanned twice. The first time is with
// the regex for an entire element start. There, the attributes
// are checked syntactically, but not separted out one by one.
// Here, we match a single attribute, and make its name and
// attribute value available to the parser code.
mAttrValue(UnicodeString(XML_SPACES "+(" XML_NAME ")" XML_SPACES "*=" XML_SPACES "*"
"((?:\\\'[^<\\\']*?\\\')|(?:\\\"[^<\\\"]*?\\\"))", -1, US_INV), 0, status),
mAttrNormalizer(UnicodeString(XML_SPACES, -1, US_INV), 0, status),
// Match any of the new-line sequences in content.
// All are changed to \u000a.
mNewLineNormalizer(UnicodeString("\\u000d\\u000a|\\u000d\\u0085|\\u000a|\\u000d|\\u0085|\\u2028", -1, US_INV), 0, status),
// & char references
// We will figure out what we've got based on which capture group has content.
// The last one is a catchall for unrecognized entity references..
// 1 2 3 4 5 6 7 8
mAmps(UnicodeString("&(?:(amp;)|(lt;)|(gt;)|(apos;)|(quot;)|#x([0-9A-Fa-f]{1,8});|#([0-9]{1,8});|(.))"),
0, status),
fNames(status),
fElementStack(status),
fOneLF((UChar)0x0a) // Plain new-line string, used in new line normalization.
{
}
UXMLParser *
UXMLParser::createParser(UErrorCode &errorCode) {
if (U_FAILURE(errorCode)) {
return NULL;
} else {
return new UXMLParser(errorCode);
}
}
UXMLParser::~UXMLParser() {}
UXMLElement *
UXMLParser::parseFile(const char *filename, UErrorCode &errorCode) {
char bytes[4096], charsetBuffer[100];
FileStream *f;
const char *charset, *pb;
UnicodeString src;
UConverter *cnv;
UChar *buffer, *pu;
int32_t fileLength, bytesLength, length, capacity;
UBool flush;
if(U_FAILURE(errorCode)) {
return NULL;
}
f=T_FileStream_open(filename, "rb");
if(f==NULL) {
errorCode=U_FILE_ACCESS_ERROR;
return NULL;
}
bytesLength=T_FileStream_read(f, bytes, (int32_t)sizeof(bytes));
if(bytesLength<(int32_t)sizeof(bytes)) {
// we have already read the entire file
fileLength=bytesLength;
} else {
// get the file length
fileLength=T_FileStream_size(f);
}
/*
* get the charset:
* 1. Unicode signature
* 2. treat as ISO-8859-1 and read XML encoding="charser"
* 3. default to UTF-8
*/
charset=ucnv_detectUnicodeSignature(bytes, bytesLength, NULL, &errorCode);
if(U_SUCCESS(errorCode) && charset!=NULL) {
// open converter according to Unicode signature
cnv=ucnv_open(charset, &errorCode);
} else {
// read as Latin-1 and parse the XML declaration and encoding
cnv=ucnv_open("ISO-8859-1", &errorCode);
if(U_FAILURE(errorCode)) {
// unexpected error opening Latin-1 converter
goto exit;
}
buffer=src.getBuffer(bytesLength);
if(buffer==NULL) {
// unexpected failure to reserve some string capacity
errorCode=U_MEMORY_ALLOCATION_ERROR;
goto exit;
}
pb=bytes;
pu=buffer;
ucnv_toUnicode(
cnv,
&pu, buffer+src.getCapacity(),
&pb, bytes+bytesLength,
NULL, TRUE, &errorCode);
src.releaseBuffer(U_SUCCESS(errorCode) ? (int32_t)(pu-buffer) : 0);
ucnv_close(cnv);
cnv=NULL;
if(U_FAILURE(errorCode)) {
// unexpected error in conversion from Latin-1
src.remove();
goto exit;
}
// parse XML declaration
if(mXMLDecl.reset(src).lookingAt(0, errorCode)) {
int32_t declEnd=mXMLDecl.end(errorCode);
// go beyond <?xml
int32_t pos=src.indexOf((UChar)x_l)+1;
mAttrValue.reset(src);
while(pos<declEnd && mAttrValue.lookingAt(pos, errorCode)) { // loop runs once per attribute on this element.
UnicodeString attName = mAttrValue.group(1, errorCode);
UnicodeString attValue = mAttrValue.group(2, errorCode);
// Trim the quotes from the att value. These are left over from the original regex
// that parsed the attribue, which couldn't conveniently strip them.
attValue.remove(0,1); // one char from the beginning
attValue.truncate(attValue.length()-1); // and one from the end.
if(attName==UNICODE_STRING("encoding", 8)) {
length=attValue.extract(0, 0x7fffffff, charsetBuffer, (int32_t)sizeof(charsetBuffer));
charset=charsetBuffer;
break;
}
pos = mAttrValue.end(2, errorCode);
}
if(charset==NULL) {
// default to UTF-8
charset="UTF-8";
}
cnv=ucnv_open(charset, &errorCode);
}
}
if(U_FAILURE(errorCode)) {
// unable to open the converter
goto exit;
}
// convert the file contents
capacity=fileLength; // estimated capacity
src.getBuffer(capacity);
src.releaseBuffer(0); // zero length
flush=FALSE;
for(;;) {
// convert contents of bytes[bytesLength]
pb=bytes;
for(;;) {
length=src.length();
buffer=src.getBuffer(capacity);
if(buffer==NULL) {
// unexpected failure to reserve some string capacity
errorCode=U_MEMORY_ALLOCATION_ERROR;
goto exit;
}
pu=buffer+length;
ucnv_toUnicode(
cnv, &pu, buffer+src.getCapacity(),
&pb, bytes+bytesLength,
NULL, FALSE, &errorCode);
src.releaseBuffer(U_SUCCESS(errorCode) ? (int32_t)(pu-buffer) : 0);
if(errorCode==U_BUFFER_OVERFLOW_ERROR) {
errorCode=U_ZERO_ERROR;
capacity=(3*src.getCapacity())/2; // increase capacity by 50%
} else {
break;
}
}
if(U_FAILURE(errorCode)) {
break; // conversion error
}
if(flush) {
break; // completely converted the file
}
// read next block
bytesLength=T_FileStream_read(f, bytes, (int32_t)sizeof(bytes));
if(bytesLength==0) {
// reached end of file, convert once more to flush the converter
flush=TRUE;
}
};
exit:
ucnv_close(cnv);
T_FileStream_close(f);
if(U_SUCCESS(errorCode)) {
return parse(src, errorCode);
} else {
return NULL;
}
}
UXMLElement *
UXMLParser::parse(const UnicodeString &src, UErrorCode &status) {
if(U_FAILURE(status)) {
return NULL;
}
UXMLElement *root = NULL;
fPos = 0; // TODO use just a local pos variable and pass it into functions
// where necessary?
// set all matchers to work on the input string
mXMLDecl.reset(src);
mXMLComment.reset(src);
mXMLSP.reset(src);
mXMLDoctype.reset(src);
mXMLPI.reset(src);
mXMLElemStart.reset(src);
mXMLElemEnd.reset(src);
mXMLElemEmpty.reset(src);
mXMLCharData.reset(src);
mAttrValue.reset(src);
mAttrNormalizer.reset(src);
mNewLineNormalizer.reset(src);
mAmps.reset(src);
// Consume the XML Declaration, if present.
if (mXMLDecl.lookingAt(fPos, status)) {
fPos = mXMLDecl.end(status);
}
// Consume "misc" [XML production 27] appearing before DocType
parseMisc(status);
// Consume a DocType declaration, if present.
if (mXMLDoctype.lookingAt(fPos, status)) {
fPos = mXMLDoctype.end(status);
}
// Consume additional "misc" [XML production 27] appearing after the DocType
parseMisc(status);
// Get the root element
if (mXMLElemEmpty.lookingAt(fPos, status)) {
// Root is an empty element (no nested elements or content)
root = createElement(mXMLElemEmpty, status);
fPos = mXMLElemEmpty.end(status);
} else {
if (mXMLElemStart.lookingAt(fPos, status) == FALSE) {
error("Root Element expected", status);
goto errorExit;
}
root = createElement(mXMLElemStart, status);
UXMLElement *el = root;
//
// This is the loop that consumes the root element of the document,
// including all nested content. Nested elements are handled by
// explicit pushes/pops of the element stack; there is no recursion
// in the control flow of this code.
// "el" always refers to the current element, the one to which content
// is being added. It is above the top of the element stack.
for (;;) {
// Nested Element Start
if (mXMLElemStart.lookingAt(fPos, status)) {
UXMLElement *t = createElement(mXMLElemStart, status);
el->fChildren.addElement(t, status);
t->fParent = el;
fElementStack.push(el, status);
el = t;
continue;
}
// Text Content. String is concatenated onto the current node's content,
// but only if it contains something other than spaces.
UnicodeString s = scanContent(status);
if (s.length() > 0) {
mXMLSP.reset(s);
if (mXMLSP.matches(status) == FALSE) {
// This chunk of text contains something other than just
// white space. Make a child node for it.
replaceCharRefs(s, status);
el->fChildren.addElement(s.clone(), status);
}
mXMLSP.reset(src); // The matchers need to stay set to the main input string.
continue;
}
// Comments. Discard.
if (mXMLComment.lookingAt(fPos, status)) {
fPos = mXMLComment.end(status);
continue;
}
// PIs. Discard.
if (mXMLPI.lookingAt(fPos, status)) {
fPos = mXMLPI.end(status);
continue;
}
// Element End
if (mXMLElemEnd.lookingAt(fPos, status)) {
fPos = mXMLElemEnd.end(0, status);
const UnicodeString name = mXMLElemEnd.group(1, status);
if (name != *el->fName) {
error("Element start / end tag mismatch", status);
goto errorExit;
}
if (fElementStack.empty()) {
// Close of the root element. We're done with the doc.
el = NULL;
break;
}
el = (UXMLElement *)fElementStack.pop();
continue;
}
// Empty Element. Stored as a child of the current element, but not stacked.
if (mXMLElemEmpty.lookingAt(fPos, status)) {
UXMLElement *t = createElement(mXMLElemEmpty, status);
el->fChildren.addElement(t, status);
continue;
}
// Hit something within the document that doesn't match anything.
// It's an error.
error("Unrecognized markup", status);
break;
}
if (el != NULL || !fElementStack.empty()) {
// We bailed out early, for some reason.
error("Root element not closed.", status);
goto errorExit;
}
}
// Root Element parse is complete.
// Consume the annoying xml "Misc" that can appear at the end of the doc.
parseMisc(status);
// We should have reached the end of the input
if (fPos != src.length()) {
error("Extra content at the end of the document", status);
goto errorExit;
}
// Success!
return root;
errorExit:
delete root;
return NULL;
}
//
// createElement
// We've just matched an element start tag. Create and fill in a UXMLElement object
// for it.
//
UXMLElement *
UXMLParser::createElement(RegexMatcher &mEl, UErrorCode &status) {
// First capture group is the element's name.
UXMLElement *el = new UXMLElement(this, intern(mEl.group(1, status), status), status);
// Scan for attributes.
int32_t pos = mEl.end(1, status); // The position after the end of the tag name
while (mAttrValue.lookingAt(pos, status)) { // loop runs once per attribute on this element.
UnicodeString attName = mAttrValue.group(1, status);
UnicodeString attValue = mAttrValue.group(2, status);
// Trim the quotes from the att value. These are left over from the original regex
// that parsed the attribue, which couldn't conveniently strip them.
attValue.remove(0,1); // one char from the beginning
attValue.truncate(attValue.length()-1); // and one from the end.
// XML Attribue value normalization.
// This is one of the really screwy parts of the XML spec.
// See http://www.w3.org/TR/2004/REC-xml11-20040204/#AVNormalize
// Note that non-validating parsers must treat all entities as type CDATA
// which simplifies things some.
// Att normalization step 1: normalize any newlines in the attribute value
mNewLineNormalizer.reset(attValue);
attValue = mNewLineNormalizer.replaceAll(fOneLF, status);
// Next change all xml white space chars to plain \u0020 spaces.
mAttrNormalizer.reset(attValue);
UnicodeString oneSpace((UChar)0x0020);
attValue = mAttrNormalizer.replaceAll(oneSpace, status);
// Replace character entities.
replaceCharRefs(attValue, status);
// Save the attribute name and value in our document structure.
el->fAttNames.addElement((void *)intern(attName, status), status);
el->fAttValues.addElement(attValue.clone(), status);
pos = mAttrValue.end(2, status);
}
fPos = mEl.end(0, status);
return el;
}
//
// parseMisc
// Consume XML "Misc" [production #27]
// which is any combination of space, PI and comments
// Need to watch end-of-input because xml MISC stuff is allowed after
// the document element, so we WILL scan off the end in this function
//
void
UXMLParser::parseMisc(UErrorCode &status) {
for (;;) {
if (fPos >= mXMLPI.input().length()) {
break;
}
if (mXMLPI.lookingAt(fPos, status)) {
fPos = mXMLPI.end(status);
continue;
}
if (mXMLSP.lookingAt(fPos, status)) {
fPos = mXMLSP.end(status);
continue;
}
if (mXMLComment.lookingAt(fPos, status)) {
fPos = mXMLComment.end(status);
continue;
}
break;
}
}
//
// Scan for document content.
//
UnicodeString
UXMLParser::scanContent(UErrorCode &status) {
UnicodeString result;
if (mXMLCharData.lookingAt(fPos, status)) {
result = mXMLCharData.group((int32_t)0, status);
// Normalize the new-lines. (Before char ref substitution)
mNewLineNormalizer.reset(result);
result = mNewLineNormalizer.replaceAll(fOneLF, status);
// TODO: handle CDATA
fPos = mXMLCharData.end(0, status);
}
return result;
}
//
// replaceCharRefs
//
// replace the char entities < & { ካ etc. in a string
// with the corresponding actual character.
//
void
UXMLParser::replaceCharRefs(UnicodeString &s, UErrorCode &status) {
UnicodeString result;
UnicodeString replacement;
int i;
mAmps.reset(s);
// See the initialization for the regex matcher mAmps.
// Which entity we've matched is determined by which capture group has content,
// which is flaged by start() of that group not being -1.
while (mAmps.find()) {
if (mAmps.start(1, status) != -1) {
replacement.setTo((UChar)x_AMP);
} else if (mAmps.start(2, status) != -1) {
replacement.setTo((UChar)x_LT);
} else if (mAmps.start(3, status) != -1) {
replacement.setTo((UChar)x_GT);
} else if (mAmps.start(4, status) != -1) {
replacement.setTo((UChar)x_APOS);
} else if (mAmps.start(5, status) != -1) {
replacement.setTo((UChar)x_QUOT);
} else if (mAmps.start(6, status) != -1) {
UnicodeString hexString = mAmps.group(6, status);
UChar32 val = 0;
for (i=0; i<hexString.length(); i++) {
val = (val << 4) + u_digit(hexString.charAt(i), 16);
}
// TODO: some verification that the character is valid
replacement.setTo(val);
} else if (mAmps.start(7, status) != -1) {
UnicodeString decimalString = mAmps.group(7, status);
UChar32 val = 0;
for (i=0; i<decimalString.length(); i++) {
val = val*10 + u_digit(decimalString.charAt(i), 10);
}
// TODO: some verification that the character is valid
replacement.setTo(val);
} else {
// An unrecognized &entity; Leave it alone.
// TODO: check that it really looks like an entity, and is not some
// random & in the text.
replacement = mAmps.group((int32_t)0, status);
}
mAmps.appendReplacement(result, replacement, status);
}
mAmps.appendTail(result);
s = result;
}
void
UXMLParser::error(const char *message, UErrorCode &status) {
// TODO: something better here...
const UnicodeString &src=mXMLDecl.input();
int line = 0;
int ci = 0;
while (ci < fPos && ci>=0) {
ci = src.indexOf((UChar)0x0a, ci+1);
line++;
}
fprintf(stderr, "Error: %s at line %d\n", message, line);
if (U_SUCCESS(status)) {
status = U_PARSE_ERROR;
}
}
// intern strings like in Java
const UnicodeString *
UXMLParser::intern(const UnicodeString &s, UErrorCode &errorCode) {
const UHashElement *he=fNames.find(s);
if(he!=NULL) {
// already a known name, return its hashed key pointer
return (const UnicodeString *)he->key.pointer;
} else {
// add this new name and return its hashed key pointer
fNames.puti(s, 0, errorCode);
he=fNames.find(s);
return (const UnicodeString *)he->key.pointer;
}
}
const UnicodeString *
UXMLParser::findName(const UnicodeString &s) const {
const UHashElement *he=fNames.find(s);
if(he!=NULL) {
// a known name, return its hashed key pointer
return (const UnicodeString *)he->key.pointer;
} else {
// unknown name
return NULL;
}
}
// UXMLElement ------------------------------------------------------------- ***
UXMLElement::UXMLElement(const UXMLParser *parser, const UnicodeString *name, UErrorCode &errorCode) :
fParser(parser),
fName(name),
fAttNames(errorCode),
fAttValues(errorCode),
fChildren(errorCode),
fParent(NULL)
{
}
UXMLElement::~UXMLElement() {
int i;
// attribute names are owned by the UXMLParser, don't delete them here
for (i=fAttValues.size()-1; i>=0; i--) {
delete (UObject *)fAttValues.elementAt(i);
}
for (i=fChildren.size()-1; i>=0; i--) {
delete (UObject *)fChildren.elementAt(i);
}
}
const UnicodeString &
UXMLElement::getTagName() const {
return *fName;
}
UnicodeString
UXMLElement::getText(UBool recurse) const {
UnicodeString text;
appendText(text, recurse);
return text;
}
void
UXMLElement::appendText(UnicodeString &text, UBool recurse) const {
const UObject *node;
int32_t i, count=fChildren.size();
for(i=0; i<count; ++i) {
node=(const UObject *)fChildren.elementAt(i);
const UnicodeString *s=dynamic_cast<const UnicodeString *>(node);
if(s!=NULL) {
text.append(*s);
} else if(recurse) /* must be a UXMLElement */ {
((const UXMLElement *)node)->appendText(text, recurse);
}
}
}
int32_t
UXMLElement::countAttributes() const {
return fAttNames.size();
}
const UnicodeString *
UXMLElement::getAttribute(int32_t i, UnicodeString &name, UnicodeString &value) const {
if(0<=i && i<fAttNames.size()) {
name.setTo(*(const UnicodeString *)fAttNames.elementAt(i));
value.setTo(*(const UnicodeString *)fAttValues.elementAt(i));
return &value; // or return (UnicodeString *)fAttValues.elementAt(i);
} else {
return NULL;
}
}
const UnicodeString *
UXMLElement::getAttribute(const UnicodeString &name) const {
// search for the attribute name by comparing the interned pointer,
// not the string contents
const UnicodeString *p=fParser->findName(name);
if(p==NULL) {
return NULL; // no such attribute seen by the parser at all
}
int32_t i, count=fAttNames.size();
for(i=0; i<count; ++i) {
if(p==(const UnicodeString *)fAttNames.elementAt(i)) {
return (const UnicodeString *)fAttValues.elementAt(i);
}
}
return NULL;
}
int32_t
UXMLElement::countChildren() const {
return fChildren.size();
}
const UObject *
UXMLElement::getChild(int32_t i, UXMLNodeType &type) const {
if(0<=i && i<fChildren.size()) {
const UObject *node=(const UObject *)fChildren.elementAt(i);
if(dynamic_cast<const UXMLElement *>(node)!=NULL) {
type=UXML_NODE_TYPE_ELEMENT;
} else {
type=UXML_NODE_TYPE_STRING;
}
return node;
} else {
return NULL;
}
}
const UXMLElement *
UXMLElement::nextChildElement(int32_t &i) const {
if(i<0) {
return NULL;
}
const UObject *node;
int32_t count=fChildren.size();
while(i<count) {
node=(const UObject *)fChildren.elementAt(i++);
const UXMLElement *elem=dynamic_cast<const UXMLElement *>(node);
if(elem!=NULL) {
return elem;
}
}
return NULL;
}
const UXMLElement *
UXMLElement::getChildElement(const UnicodeString &name) const {
// search for the element name by comparing the interned pointer,
// not the string contents
const UnicodeString *p=fParser->findName(name);
if(p==NULL) {
return NULL; // no such element seen by the parser at all
}
const UObject *node;
int32_t i, count=fChildren.size();
for(i=0; i<count; ++i) {
node=(const UObject *)fChildren.elementAt(i);
const UXMLElement *elem=dynamic_cast<const UXMLElement *>(node);
if(elem!=NULL) {
if(p==elem->fName) {
return elem;
}
}
}
return NULL;
}
U_NAMESPACE_END
#endif /* !UCONFIG_NO_REGULAR_EXPRESSIONS */