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godot/thirdparty/thorvg/src/loaders/svg/tvgXmlParser.cpp
K. S. Ernest (iFire) Lee 609389af46 Use ThorVG instead of NanoSVG for importing SVGs 
ThorVG is a platform-independent portable library for drawing vector-based scene and animation.
Fixups to ThorVG integration

Update 0.4.0


Update readme.
Restore upsample.

Missed on scsub.


Modules are needed.

Restore build.

Do the math properly.

Force ColorStops to be not const.
2021-11-10 02:37:59 -08:00

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16 KiB
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/*
* Copyright (c) 2020-2021 Samsung Electronics Co., Ltd. All rights reserved.
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <ctype.h>
#include <string>
#ifdef _WIN32
#include <malloc.h>
#else
#include <alloca.h>
#endif
#include "tvgXmlParser.h"
/************************************************************************/
/* Internal Class Implementation */
/************************************************************************/
bool _isIgnoreUnsupportedLogAttributes(TVG_UNUSED const char* tagAttribute, TVG_UNUSED const char* tagValue)
{
#ifdef THORVG_LOG_ENABLED
const auto attributesNum = 6;
const struct
{
const char* tag;
bool tagWildcard; //If true, it is assumed that a wildcard is used after the tag. (ex: tagName*)
const char* value;
} attributes[] = {
{"id", false, nullptr},
{"data-name", false, nullptr},
{"overflow", false, "visible"},
{"version", false, nullptr},
{"xmlns", true, nullptr},
{"xml:space", false, nullptr},
};
for (unsigned int i = 0; i < attributesNum; ++i) {
if (!strncmp(tagAttribute, attributes[i].tag, attributes[i].tagWildcard ? strlen(attributes[i].tag) : strlen(tagAttribute))) {
if (attributes[i].value && tagValue) {
if (!strncmp(tagValue, attributes[i].value, strlen(tagValue))) {
return true;
} else continue;
}
return true;
}
}
return false;
#endif
return true;
}
static const char* _simpleXmlFindWhiteSpace(const char* itr, const char* itrEnd)
{
for (; itr < itrEnd; itr++) {
if (isspace((unsigned char)*itr)) break;
}
return itr;
}
static const char* _simpleXmlSkipWhiteSpace(const char* itr, const char* itrEnd)
{
for (; itr < itrEnd; itr++) {
if (!isspace((unsigned char)*itr)) break;
}
return itr;
}
static const char* _simpleXmlUnskipWhiteSpace(const char* itr, const char* itrStart)
{
for (itr--; itr > itrStart; itr--) {
if (!isspace((unsigned char)*itr)) break;
}
return itr + 1;
}
static const char* _simpleXmlSkipXmlEntities(const char* itr, const char* itrEnd)
{
auto p = itr;
while (itr < itrEnd && *itr == '&') {
for (int i = 0; i < NUMBER_OF_XML_ENTITIES; ++i) {
if (strncmp(itr, xmlEntity[i], xmlEntityLength[i]) == 0) {
itr += xmlEntityLength[i];
break;
}
}
if (itr == p) break;
p = itr;
}
return itr;
}
static const char* _simpleXmlUnskipXmlEntities(const char* itr, const char* itrStart)
{
auto p = itr;
while (itr > itrStart && *(itr - 1) == ';') {
for (int i = 0; i < NUMBER_OF_XML_ENTITIES; ++i) {
if (itr - xmlEntityLength[i] > itrStart &&
strncmp(itr - xmlEntityLength[i], xmlEntity[i], xmlEntityLength[i]) == 0) {
itr -= xmlEntityLength[i];
break;
}
}
if (itr == p) break;
p = itr;
}
return itr;
}
static const char* _skipWhiteSpacesAndXmlEntities(const char* itr, const char* itrEnd)
{
itr = _simpleXmlSkipWhiteSpace(itr, itrEnd);
auto p = itr;
while (true) {
if (p != (itr = _simpleXmlSkipXmlEntities(itr, itrEnd))) p = itr;
else break;
if (p != (itr = _simpleXmlSkipWhiteSpace(itr, itrEnd))) p = itr;
else break;
}
return itr;
}
static const char* _unskipWhiteSpacesAndXmlEntities(const char* itr, const char* itrStart)
{
itr = _simpleXmlUnskipWhiteSpace(itr, itrStart);
auto p = itr;
while (true) {
if (p != (itr = _simpleXmlUnskipXmlEntities(itr, itrStart))) p = itr;
else break;
if (p != (itr = _simpleXmlUnskipWhiteSpace(itr, itrStart))) p = itr;
else break;
}
return itr;
}
static const char* _simpleXmlFindStartTag(const char* itr, const char* itrEnd)
{
return (const char*)memchr(itr, '<', itrEnd - itr);
}
static const char* _simpleXmlFindEndTag(const char* itr, const char* itrEnd)
{
bool insideQuote = false;
for (; itr < itrEnd; itr++) {
if (*itr == '"') insideQuote = !insideQuote;
if (!insideQuote) {
if ((*itr == '>') || (*itr == '<'))
return itr;
}
}
return nullptr;
}
static const char* _simpleXmlFindEndCommentTag(const char* itr, const char* itrEnd)
{
for (; itr < itrEnd; itr++) {
if ((*itr == '-') && ((itr + 1 < itrEnd) && (*(itr + 1) == '-')) && ((itr + 2 < itrEnd) && (*(itr + 2) == '>'))) return itr + 2;
}
return nullptr;
}
static const char* _simpleXmlFindEndCdataTag(const char* itr, const char* itrEnd)
{
for (; itr < itrEnd; itr++) {
if ((*itr == ']') && ((itr + 1 < itrEnd) && (*(itr + 1) == ']')) && ((itr + 2 < itrEnd) && (*(itr + 2) == '>'))) return itr + 2;
}
return nullptr;
}
static const char* _simpleXmlFindDoctypeChildEndTag(const char* itr, const char* itrEnd)
{
for (; itr < itrEnd; itr++) {
if (*itr == '>') return itr;
}
return nullptr;
}
static SimpleXMLType _getXMLType(const char* itr, const char* itrEnd, size_t &toff)
{
toff = 0;
if (itr[1] == '/') {
toff = 1;
return SimpleXMLType::Close;
} else if (itr[1] == '?') {
toff = 1;
return SimpleXMLType::Processing;
} else if (itr[1] == '!') {
if ((itr + sizeof("<!DOCTYPE>") - 1 < itrEnd) && (!memcmp(itr + 2, "DOCTYPE", sizeof("DOCTYPE") - 1)) && ((itr[2 + sizeof("DOCTYPE") - 1] == '>') || (isspace((unsigned char)itr[2 + sizeof("DOCTYPE") - 1])))) {
toff = sizeof("!DOCTYPE") - 1;
return SimpleXMLType::Doctype;
} else if (itr + sizeof("<!>") - 1 < itrEnd) {
toff = sizeof("!") - 1;
return SimpleXMLType::DoctypeChild;
} else if ((itr + sizeof("<![CDATA[]]>") - 1 < itrEnd) && (!memcmp(itr + 2, "[CDATA[", sizeof("[CDATA[") - 1))) {
toff = sizeof("![CDATA[") - 1;
return SimpleXMLType::CData;
} else if ((itr + sizeof("<!---->") - 1 < itrEnd) && (!memcmp(itr + 2, "--", sizeof("--") - 1))) {
toff = sizeof("!--") - 1;
return SimpleXMLType::Comment;
}
return SimpleXMLType::Open;
}
return SimpleXMLType::Open;
}
/************************************************************************/
/* External Class Implementation */
/************************************************************************/
const char* simpleXmlNodeTypeToString(TVG_UNUSED SvgNodeType type)
{
#ifdef THORVG_LOG_ENABLED
static const char* TYPE_NAMES[] = {
"Svg",
"G",
"Defs",
"Animation",
"Arc",
"Circle",
"Ellipse",
"Image",
"Line",
"Path",
"Polygon",
"Polyline",
"Rect",
"Text",
"TextArea",
"Tspan",
"Use",
"Video",
"ClipPath",
"Mask",
"Unknown",
};
return TYPE_NAMES[(int) type];
#endif
return nullptr;
}
bool isIgnoreUnsupportedLogElements(TVG_UNUSED const char* tagName)
{
#ifdef THORVG_LOG_ENABLED
const auto elementsNum = 1;
const char* const elements[] = { "title" };
for (unsigned int i = 0; i < elementsNum; ++i) {
if (!strncmp(tagName, elements[i], strlen(tagName))) {
return true;
}
}
return false;
#else
return true;
#endif
}
bool simpleXmlParseAttributes(const char* buf, unsigned bufLength, simpleXMLAttributeCb func, const void* data)
{
const char *itr = buf, *itrEnd = buf + bufLength;
char* tmpBuf = (char*)alloca(bufLength + 1);
if (!buf || !func) return false;
while (itr < itrEnd) {
const char* p = _skipWhiteSpacesAndXmlEntities(itr, itrEnd);
const char *key, *keyEnd, *value, *valueEnd;
char* tval;
if (p == itrEnd) return true;
key = p;
for (keyEnd = key; keyEnd < itrEnd; keyEnd++) {
if ((*keyEnd == '=') || (isspace((unsigned char)*keyEnd))) break;
}
if (keyEnd == itrEnd) return false;
if (keyEnd == key) continue;
if (*keyEnd == '=') value = keyEnd + 1;
else {
value = (const char*)memchr(keyEnd, '=', itrEnd - keyEnd);
if (!value) return false;
value++;
}
keyEnd = _simpleXmlUnskipXmlEntities(keyEnd, key);
value = _skipWhiteSpacesAndXmlEntities(value, itrEnd);
if (value == itrEnd) return false;
if ((*value == '"') || (*value == '\'')) {
valueEnd = (const char*)memchr(value + 1, *value, itrEnd - value);
if (!valueEnd) return false;
value++;
} else {
valueEnd = _simpleXmlFindWhiteSpace(value, itrEnd);
}
itr = valueEnd + 1;
value = _skipWhiteSpacesAndXmlEntities(value, itrEnd);
valueEnd = _unskipWhiteSpacesAndXmlEntities(valueEnd, value);
memcpy(tmpBuf, key, keyEnd - key);
tmpBuf[keyEnd - key] = '\0';
tval = tmpBuf + (keyEnd - key) + 1;
int i = 0;
while (value < valueEnd) {
value = _simpleXmlSkipXmlEntities(value, valueEnd);
tval[i++] = *value;
value++;
}
tval[i] = '\0';
if (!func((void*)data, tmpBuf, tval)) {
if (!_isIgnoreUnsupportedLogAttributes(tmpBuf, tval)) {
TVGLOG("SVG", "Unsupported attributes used [Elements type: %s][Id : %s][Attribute: %s][Value: %s]", simpleXmlNodeTypeToString(((SvgLoaderData*)data)->svgParse->node->type), ((SvgLoaderData*)data)->svgParse->node->id ? ((SvgLoaderData*)data)->svgParse->node->id->c_str() : "NO_ID", tmpBuf, tval ? tval : "NONE");
}
}
}
return true;
}
bool simpleXmlParse(const char* buf, unsigned bufLength, bool strip, simpleXMLCb func, const void* data)
{
const char *itr = buf, *itrEnd = buf + bufLength;
if (!buf || !func) return false;
while (itr < itrEnd) {
if (itr[0] == '<') {
//Invalid case
if (itr + 1 >= itrEnd) return false;
size_t toff = 0;
SimpleXMLType type = _getXMLType(itr, itrEnd, toff);
const char* p;
if (type == SimpleXMLType::CData) p = _simpleXmlFindEndCdataTag(itr + 1 + toff, itrEnd);
else if (type == SimpleXMLType::DoctypeChild) p = _simpleXmlFindDoctypeChildEndTag(itr + 1 + toff, itrEnd);
else if (type == SimpleXMLType::Comment) p = _simpleXmlFindEndCommentTag(itr + 1 + toff, itrEnd);
else p = _simpleXmlFindEndTag(itr + 1 + toff, itrEnd);
if (p) {
//Invalid case: '<' nested
if (*p == '<') return false;
const char *start, *end;
start = itr + 1 + toff;
end = p;
switch (type) {
case SimpleXMLType::Open: {
if (p[-1] == '/') {
type = SimpleXMLType::OpenEmpty;
end--;
}
break;
}
case SimpleXMLType::CData: {
if (!memcmp(p - 2, "]]", 2)) end -= 2;
break;
}
case SimpleXMLType::Processing: {
if (p[-1] == '?') end--;
break;
}
case SimpleXMLType::Comment: {
if (!memcmp(p - 2, "--", 2)) end -= 2;
break;
}
default: {
break;
}
}
if (strip && (type != SimpleXMLType::CData)) {
start = _skipWhiteSpacesAndXmlEntities(start, end);
end = _unskipWhiteSpacesAndXmlEntities(end, start);
}
if (!func((void*)data, type, start, (unsigned int)(end - start))) return false;
itr = p + 1;
} else {
return false;
}
} else {
const char *p, *end;
if (strip) {
p = itr;
p = _skipWhiteSpacesAndXmlEntities(p, itrEnd);
if (p) {
if (!func((void*)data, SimpleXMLType::Ignored, itr, (unsigned int)(p - itr))) return false;
itr = p;
}
}
p = _simpleXmlFindStartTag(itr, itrEnd);
if (!p) p = itrEnd;
end = p;
if (strip) end = _unskipWhiteSpacesAndXmlEntities(end, itr);
if (itr != end && !func((void*)data, SimpleXMLType::Data, itr, (unsigned int)(end - itr))) return false;
if (strip && (end < p) && !func((void*)data, SimpleXMLType::Ignored, end, (unsigned int)(p - end))) return false;
itr = p;
}
}
return true;
}
bool simpleXmlParseW3CAttribute(const char* buf, simpleXMLAttributeCb func, const void* data)
{
const char* end;
char* key;
char* val;
char* next;
if (!buf) return false;
end = buf + strlen(buf);
key = (char*)alloca(end - buf + 1);
val = (char*)alloca(end - buf + 1);
if (buf == end) return true;
do {
char* sep = (char*)strchr(buf, ':');
next = (char*)strchr(buf, ';');
key[0] = '\0';
val[0] = '\0';
if (next == nullptr && sep != nullptr) {
memcpy(key, buf, sep - buf);
key[sep - buf] = '\0';
memcpy(val, sep + 1, end - sep - 1);
val[end - sep - 1] = '\0';
} else if (sep < next && sep != nullptr) {
memcpy(key, buf, sep - buf);
key[sep - buf] = '\0';
memcpy(val, sep + 1, next - sep - 1);
val[next - sep - 1] = '\0';
} else if (next) {
memcpy(key, buf, next - buf);
key[next - buf] = '\0';
}
if (key[0]) {
key = const_cast<char*>(_simpleXmlSkipWhiteSpace(key, key + strlen(key)));
key[_simpleXmlUnskipWhiteSpace(key + strlen(key) , key) - key] = '\0';
val = const_cast<char*>(_simpleXmlSkipWhiteSpace(val, val + strlen(val)));
val[_simpleXmlUnskipWhiteSpace(val + strlen(val) , val) - val] = '\0';
if (!func((void*)data, key, val)) {
if (!_isIgnoreUnsupportedLogAttributes(key, val)) {
TVGLOG("SVG", "Unsupported attributes used [Elements type: %s][Id : %s][Attribute: %s][Value: %s]", simpleXmlNodeTypeToString(((SvgLoaderData*)data)->svgParse->node->type), ((SvgLoaderData*)data)->svgParse->node->id ? ((SvgLoaderData*)data)->svgParse->node->id->c_str() : "NO_ID", key, val ? val : "NONE");
}
}
}
buf = next + 1;
} while (next != nullptr);
return true;
}
const char* simpleXmlFindAttributesTag(const char* buf, unsigned bufLength)
{
const char *itr = buf, *itrEnd = buf + bufLength;
for (; itr < itrEnd; itr++) {
if (!isspace((unsigned char)*itr)) {
//User skip tagname and already gave it the attributes.
if (*itr == '=') return buf;
} else {
itr = _simpleXmlUnskipXmlEntities(itr, buf);
if (itr == itrEnd) return nullptr;
return itr;
}
}
return nullptr;
}
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