1 files changed, 92 insertions, 0 deletions
diff --git a/src-qt5/desktop-utils/lumina-calculator/mainUI.cpp b/src-qt5/desktop-utils/lumina-calculator/mainUI.cpp
new file mode 100644
index 00000000..18d2cfdd
--- /dev/null
+++ b/src-qt5/desktop-utils/lumina-calculator/mainUI.cpp
@@ -0,0 +1,92 @@
+//===========================================
+//  Lumina Desktop source code
+//  Copyright (c) 2016, Ken Moore
+//  Available under the 3-clause BSD license
+//  See the LICENSE file for full details
+//===========================================
+#include "mainUI.h"
+#include "ui_mainUI.h"
+
+#include <QDebug>
+
+#define VALIDSYMBOLS QString("+-*x/.")
+
+#include <math.h>
+#define BADVALUE NAN
+
+mainUI::mainUI() : QMainWindow(), ui(new Ui::mainUI()){
+  ui->setupUi(this);
+  connect(ui->tool_start, SIGNAL(clicked()), this, SLOT(start_calc()) );
+  connect(ui->line_eq, SIGNAL(returnPressed()), this, SLOT(start_calc()) );
+  ui->line_eq->setFocus();
+}
+
+mainUI::~mainUI(){
+  
+}
+
+void mainUI::start_calc(){
+  if(ui->line_eq->text().isEmpty()){ return; } //nothing to do
+  double result = strToNumber(ui->line_eq->text());
+  if(result!=result){ return; } //bad calculation - NaN's values are special in that they don't equal itself
+  QString res = "%1 \t(%2)";
+  ui->list_results->addItem(res.arg(QString::number(result), ui->line_eq->text()));
+  ui->list_results->scrollToItem( ui->list_results->item( ui->list_results->count()-1) );
+  ui->line_eq->clear();
+}
+
+double mainUI::performOperation(double LHS, double RHS, QChar symbol){
+  if(symbol== '+'){ return (LHS+RHS); }
+  else if(symbol== '-'){ return (LHS-RHS); }
+  else if(symbol== '*' || symbol=='x'){ return (LHS*RHS); }
+  else if(symbol== '/'){ return (LHS/RHS); }
+  //else if(symbol== '%'){ return (LHS%RHS); }
+  qDebug() << "Invalid Symbol:" << symbol;
+  return BADVALUE;
+}
+
+double mainUI::strToNumber(QString str){
+  //Look for perentheses first
+  qDebug() << "String to Number: " << str;
+  if(str.indexOf("(")>=0){
+    //qDebug() << "Found Parenthesis";
+    int start = str.indexOf("(");
+    int need = 1;
+    int end = -1;
+    for(int i=start+1; i<str.length() && need>0; i++){
+      if(str[i]=='('){ need++; }
+      else if(str[i]==')'){ need--; }
+      //qDebug() << "Check char:" << str[i] << need;
+      if(need==0){ end = i; }
+    }
+    if(end<start){ return BADVALUE; }
+    //qDebug() << "Replace value:" << str << start << end << str.mid(start+1,end-start);
+    str.replace(start, end-start+1, QString::number( strToNumber( str.mid(start+1, end-start-1)) ) );
+    //qDebug() << "Replaced:" << str;
+  }
+  //  -------------------------------------
+  // NOTE: the order of operations appears reversed here due to the recursive nature of the algorithm
+  //     the first operation *found* is actually the last one *evaluated*
+  // --------------------------------------
+  //Now look for add/subtract
+  int sym = -1;
+  QStringList symbols; symbols << "+" << "-";
+  for(int i=0; i<symbols.length(); i++){
+    int tmp = str.indexOf(symbols[i]);
+    if(sym < tmp){ sym = tmp; }
+  }
+  if(sym>0){  return performOperation( strToNumber(str.left(sym)), strToNumber(str.right(str.length()-sym-1)), str[sym]); }
+  if(sym==0){ return BADVALUE; }
+  //Now look for multiply/divide
+  symbols.clear(); symbols << "x" << "*" << "/";
+  for(int i=0; i<symbols.length(); i++){
+    int tmp = str.indexOf(symbols[i]);
+    if(sym < tmp){ sym = tmp; }
+  }
+  if(sym>0){  return performOperation( strToNumber(str.left(sym)), strToNumber(str.right(str.length()-sym-1)), str[sym]); }
+  if(sym==0){ return BADVALUE; }
+
+  //Could not find any operations - must be a raw number
+  //qDebug() << "Found Number:" << str.toDouble();
+  return str.toDouble();
+}