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/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkXMLParser.h"
#include "SkChunkAlloc.h"
#include "SkString.h"
#include "SkStream.h"
#include "expat.h"
static inline char* dupstr(SkChunkAlloc& chunk, const char src[], size_t len)
{
SkASSERT(src);
char* dst = (char*)chunk.alloc(len + 1, SkChunkAlloc::kThrow_AllocFailType);
memcpy(dst, src, len);
dst[len] = 0;
return dst;
}
static inline int count_pairs(const char** p)
{
const char** start = p;
while (*p)
{
SkASSERT(p[1] != NULL);
p += 2;
}
return (p - start) >> 1;
}
struct Data {
Data() : fAlloc(2048), fState(NORMAL) {}
XML_Parser fParser;
SkXMLPullParser::Curr* fCurr;
SkChunkAlloc fAlloc;
enum State {
NORMAL,
MISSED_START_TAG,
RETURN_END_TAG
};
State fState;
const char* fEndTag; // if state is RETURN_END_TAG
};
static void XMLCALL start_proc(void *data, const char *el, const char **attr)
{
Data* p = (Data*)data;
SkXMLPullParser::Curr* c = p->fCurr;
SkChunkAlloc& alloc = p->fAlloc;
c->fName = dupstr(alloc, el, strlen(el));
int n = count_pairs(attr);
SkXMLPullParser::AttrInfo* info = (SkXMLPullParser::AttrInfo*)alloc.alloc(n * sizeof(SkXMLPullParser::AttrInfo),
SkChunkAlloc::kThrow_AllocFailType);
c->fAttrInfoCount = n;
c->fAttrInfos = info;
for (int i = 0; i < n; i++)
{
info[i].fName = dupstr(alloc, attr[0], strlen(attr[0]));
info[i].fValue = dupstr(alloc, attr[1], strlen(attr[1]));
attr += 2;
}
c->fEventType = SkXMLPullParser::START_TAG;
XML_StopParser(p->fParser, true);
}
static void XMLCALL end_proc(void *data, const char *el)
{
Data* p = (Data*)data;
SkXMLPullParser::Curr* c = p->fCurr;
if (c->fEventType == SkXMLPullParser::START_TAG)
{
/* if we get here, we were called with a start_tag immediately
followed by this end_tag. The caller will only see the end_tag,
so we set a flag to notify them of the missed start_tag
*/
p->fState = Data::MISSED_START_TAG;
SkASSERT(c->fName != NULL);
SkASSERT(strcmp(c->fName, el) == 0);
}
else
c->fName = dupstr(p->fAlloc, el, strlen(el));
c->fEventType = SkXMLPullParser::END_TAG;
XML_StopParser(p->fParser, true);
}
#include <ctype.h>
static bool isws(const char s[])
{
for (; *s; s++)
if (!isspace(*s))
return false;
return true;
}
static void XMLCALL text_proc(void* data, const char* text, int len)
{
Data* p = (Data*)data;
SkXMLPullParser::Curr* c = p->fCurr;
c->fName = dupstr(p->fAlloc, text, len);
c->fIsWhitespace = isws(c->fName);
c->fEventType = SkXMLPullParser::TEXT;
XML_StopParser(p->fParser, true);
}
//////////////////////////////////////////////////////////////////////////
struct SkXMLPullParser::Impl {
Data fData;
void* fBuffer;
size_t fBufferLen;
};
static void reportError(XML_Parser parser)
{
XML_Error code = XML_GetErrorCode(parser);
int lineNumber = XML_GetCurrentLineNumber(parser);
const char* msg = XML_ErrorString(code);
printf("-------- XML error [%d] on line %d, %s\n", code, lineNumber, msg);
}
bool SkXMLPullParser::onInit()
{
fImpl = new Impl;
XML_Parser p = XML_ParserCreate(NULL);
SkASSERT(p);
fImpl->fData.fParser = p;
fImpl->fData.fCurr = &fCurr;
XML_SetElementHandler(p, start_proc, end_proc);
XML_SetCharacterDataHandler(p, text_proc);
XML_SetUserData(p, &fImpl->fData);
size_t len = fStream->read(NULL, 0);
fImpl->fBufferLen = len;
fImpl->fBuffer = sk_malloc_throw(len);
fStream->rewind();
size_t len2 = fStream->read(fImpl->fBuffer, len);
return len2 == len;
}
void SkXMLPullParser::onExit()
{
sk_free(fImpl->fBuffer);
XML_ParserFree(fImpl->fData.fParser);
delete fImpl;
fImpl = NULL;
}
SkXMLPullParser::EventType SkXMLPullParser::onNextToken()
{
if (Data::RETURN_END_TAG == fImpl->fData.fState)
{
fImpl->fData.fState = Data::NORMAL;
fCurr.fName = fImpl->fData.fEndTag; // restore name from (below) save
return SkXMLPullParser::END_TAG;
}
fImpl->fData.fAlloc.reset();
XML_Parser p = fImpl->fData.fParser;
XML_Status status;
status = XML_ResumeParser(p);
CHECK_STATUS:
switch (status) {
case XML_STATUS_OK:
return SkXMLPullParser::END_DOCUMENT;
case XML_STATUS_ERROR:
if (XML_GetErrorCode(p) != XML_ERROR_NOT_SUSPENDED)
{
reportError(p);
return SkXMLPullParser::ERROR;
}
status = XML_Parse(p, (const char*)fImpl->fBuffer, fImpl->fBufferLen, true);
goto CHECK_STATUS;
case XML_STATUS_SUSPENDED:
if (Data::MISSED_START_TAG == fImpl->fData.fState)
{
// return a start_tag, and clear the flag so we return end_tag next
SkASSERT(SkXMLPullParser::END_TAG == fCurr.fEventType);
fImpl->fData.fState = Data::RETURN_END_TAG;
fImpl->fData.fEndTag = fCurr.fName; // save this pointer
return SkXMLPullParser::START_TAG;
}
break;
}
return fCurr.fEventType;
}
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