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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->getLength();

     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;

 }