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FnXmlReader.cpp
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FnXmlReader.cpp
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//
/////////////////////////////////////////////////////////
#include "Calculator.h"
#include "Fn.h"
#include "FnData.h"
#include "FnXmlReader.h"
/////////////////////////////////////////////////////////
FnXmlReader::FnXmlReader(VariableList *varListInput, DisplayWidget *displayInput)
{
varList = varListInput;
display = displayInput;
}
void FnXmlReader::readXml(QFile *file)
{
reader.setDevice(file);
reader.readNext();
while(!reader.atEnd()) {
if(reader.isStartElement()) {
if(reader.name() == "fn") { // check version number
QString fileVersion = reader.attributes().value("version").toString();
bool ok;
if(FnVersion.toFloat() < fileVersion.toFloat(&ok) || !ok ) {
reader.raiseError(QObject::tr("File version (%1) is more recent than current version (%2)")
.arg(fileVersion).arg(FnVersion));
} else {
readCalculatorElement();
}
} else {
reader.raiseError(QObject::tr("Not a Free Group Calculator File"));
}
} else {
reader.readNext();
}
}
}
bool FnXmlReader::hasError()
{
return reader.hasError();
}
QString FnXmlReader::errorString()
{
return reader.errorString();
}
/////////////////////////////////////////////////////////
// PRIVATE
void FnXmlReader::readCalculatorElement()
{
reader.readNext();
while(!reader.atEnd()) {
if(reader.isEndElement()) { // can only be </fn>
reader.readNext();
break;
}
if(reader.isStartElement()) {
if(reader.name() == "variables") {
readVariableListElement();
} else if(reader.name() == "output") {
skipUnknownElement(); // need to make reader here!
} else {
skipUnknownElement();
}
} else {
reader.readNext();
}
}
}
void FnXmlReader::readVariableElement()
{
QString varType = reader.attributes().value("type").toString();
bool isList = (reader.attributes().value("list").toString() == "true") ? true : false;
QString varName;
QStringList varValue;
bool readName = false;
bool readValue = false;
reader.readNext();
if(varType == "no type" || varType.isEmpty()) {
reader.raiseError(QObject::tr("Variable error: type not specified"));
return;
}
while(!reader.atEnd()) {
if(reader.isEndElement()) { // can only be </var>
reader.readNext();
break;
}
if(reader.isStartElement()) {
if(reader.name() == "name") {
if(readName) { // already read in name of variable
reader.raiseError(QObject::tr("Variable Error: duplicate name field"));
}
else {
varName = reader.readElementText();
readName = true;
reader.readNext();
}
} else if(reader.name() == "value") {
if(readValue && !isList) { // already read in value of variable
reader.raiseError(QObject::tr("Variable Error: duplicate value field in non-list"));
}
else {
varValue.append(reader.readElementText());
readValue = true;
reader.readNext();
}
} else {
skipUnknownElement();
}
} else {
reader.readNext();
}
}
if(!readName || !readValue) {
reader.raiseError(QObject::tr("Variable Error: name or value field missing"));
return;
}
FnData variable = processData(varValue.takeFirst(),varType);
foreach(QString variableString, varValue) {
FnData nextData = processData(variableString,varType);
variable.addToList(nextData);
}
varList->insert(varName,variable);
}
void FnXmlReader::readVariableListElement()
{
reader.readNext();
while(!reader.atEnd()) {
if(reader.isEndElement()) { // can only be </variables>
reader.readNext();
break;
}
if(reader.isStartElement()) {
if(reader.name() == "var") {
readVariableElement();
} else {
skipUnknownElement();
}
} else {
reader.readNext();
}
}
}
void FnXmlReader::skipUnknownElement()
{
reader.readNext();
while(!reader.atEnd()) {
if(reader.isEndElement()) {
reader.readNext();
break;
}
if(reader.isStartElement()) {
skipUnknownElement();
} else {
reader.readNext();
}
}
}
FnData FnXmlReader::processData(const QString & varValue,const QString & varType) {
FnData variable;
variable.setFailMessage("Xml Reader Error");
if(varType == "element"){
FnWord u(varValue);
if(!u.checkBasis()) {
reader.raiseError(QObject::tr("Variable Error: %1 is not a valid element").arg(varValue));
return variable;
}
variable.setElement(u);
}
else if(varType == "integer") {
int i;
bool ok;
i = varValue.toInt(&ok);
if(!ok) {
reader.raiseError(QObject::tr("Variable Error: %1 is not a valid integer").arg(varValue));
return variable;
}
variable.setInteger(i);
}
else if(varType == "graph") {
if(!varValue.startsWith(QChar('(')) || !varValue.endsWith(QChar(')'))) {
reader.raiseError(QObject::tr("Variable Error: %1 is not a valid graph").arg(varValue));
return variable;
}
variable = loadGraphData(varValue);
if(variable.type() == FailMessage) {
reader.raiseError(variable.toOutput());
return variable;
}
}
else if(varType == "morphism") {
if(!varValue.startsWith(QChar('{')) || !varValue.endsWith(QChar('}'))) {
reader.raiseError(QObject::tr("Variable Error: %1 is not a valid morphism").arg(varValue));
return variable;
}
variable = loadMorphismData(varValue);
if(variable.type() == FailMessage) {
reader.raiseError(variable.toOutput());
return variable;
}
}
else {
reader.raiseError(QObject::tr("Variable Error: cannot identify type"));
return variable;
}
return variable;
}