From 33ec9ead7ce30bf9450b9048506f0bda49ba4791 Mon Sep 17 00:00:00 2001
From: cniehaus <cniehaus>
Date: Sun, 15 Sep 2002 17:09:54 +0000
Subject: Fell free to shoot me if I messed up CVS again... *fingercrossed*

---
(limited to 'noncore/apps/oxygen/kmolcalc.cpp')

diff --git a/noncore/apps/oxygen/kmolcalc.cpp b/noncore/apps/oxygen/kmolcalc.cpp
new file mode 100644
index 0000000..7257c4a
--- a/dev/null
+++ b/noncore/apps/oxygen/kmolcalc.cpp
@@ -0,0 +1,235 @@
+/* 
+ * kmolcalc.cpp
+ *
+ * Copyright (C) 2000 Tomislav Gountchev <tomi@idiom.com>
+ * Copyright (C) 2002 Carsten Niehaus <cniehaus@handhelds.org>
+ */
+
+/**
+ * KMOLCALC is the calculation engine. It knows about a hashtable of user defined atomic
+ * weights and group definitions ELSTABLE, and the currently processed formula, stored
+ * as a list of elements and their coefficients, ELEMENTS. 
+ */
+
+#include "kmolcalc.h"
+#include <qdict.h>
+#include <qdir.h>
+#include <qfile.h>
+#include <iostream.h>
+
+
+/**
+ * Construct a new calculator object.
+ */
+KMolCalc::KMolCalc() {
+  elements = new ElementList;
+  elstable = NULL;
+  readElstable();
+}
+
+KMolCalc::~KMolCalc() {
+  delete elements;
+}
+
+void KMolCalc::readElstable() {
+  weight = -1; // not calculated yet
+  if (elstable) delete elstable;
+  elstable = new QDict<SubUnit> (197, TRUE);
+  elstable->setAutoDelete(TRUE);
+  QStringList files = "/home/opie/opie/noncore/apps/oxigen/kmolweights";
+  mwfile = "/home/opie/opie/noncore/apps/oxigen/kmolweights";
+  QFile f(mwfile);
+  QString* latest_f = &mwfile;
+  for (uint i=0; i<files.count(); i++) {
+  	if (QFileInfo(QFile(files[i])).lastModified() > QFileInfo(QFile(*latest_f)).lastModified()) {
+		latest_f = &files[i];
+    }
+  }
+  QFile lf(*latest_f);
+  if (f.exists()) readMwfile(f);
+  if (!f.exists()) {
+  	readMwfile(lf);
+  	writeElstable();
+  } else if (QFileInfo(f).lastModified() < QFileInfo(lf).lastModified()) {
+    // announce
+    QMessageBox::information 
+      (0, "Warning:", "Found new global Mw file.\nLocal definitions will be updated.", QMessageBox::Ok);
+    readMwfile(lf);
+    writeElstable();
+  }
+  
+}
+
+
+/** 
+ * Parse a string S and construct the ElementList this->ELEMENTS, representing the 
+ * composition of S. Returns 0 if successful, or an error code (currently -1) if 
+ * parsing failed.
+ * The elements is S must be valid element or group symbols, as stored in this->ELSTABLE.
+ * See help files for correct formula syntax.
+ */
+QString KMolCalc::readFormula(const QString& s) {
+  weight = -1;
+  if (elements) delete elements;
+  elements = new ElementList;
+  return KMolCalc::readGroup(s, elements);
+}
+
+// read a formula group recursively. Called by readFormula.
+QString KMolCalc::readGroup(const QString& s, ElementList* els) {
+    if (s.isEmpty()) return QString ("Enter a formula."); //ERROR
+    int sl = s.length();
+    int i = 0;
+    QString errors ("OK");
+    bool ok = TRUE;
+    while (i < sl && ((s[i] <= '9' && s[i] >= '0') || s[i] == '.')) i++;
+    double prefix = (i == 0 ? 1 : s.left(i).toDouble(&ok)); 
+    if (! ok || i == sl || prefix == 0) return QString ("Bad formula."); // ERROR
+    ElementList* elstemp = new ElementList;
+    while (i < sl) {
+        int j = i;
+        if (s[i] == '(') {
+            ElementList* inner = new ElementList;
+            int level = 1; // count levels of nested ( ).
+            while (1) {
+                if (i++ == sl) {
+                    delete inner;
+                    delete elstemp;
+                    return QString ("Bad formula."); //ERROR
+                }
+                if (s[i] == '(') level++;
+                if (s[i] == ')') level--;
+                if (level == 0) break;
+            }
+            errors = KMolCalc::readGroup(s.mid(j+1, i-j-1), inner);
+            j = ++i;
+            while (i < sl && ((s[i] <= '9' && s[i] >= '0') || s[i] == '.')) i++;
+            double suffix = (i == j ? 1 : s.mid(j, i-j).toDouble(&ok)); 
+            if (! ok || suffix == 0) {
+                delete inner;
+                delete elstemp;
+                return QString ("Bad formula."); // ERROR
+            }      
+            inner->addTo(*elstemp, suffix);
+            delete inner;
+            inner = NULL;
+        } else if ((s[i] >= 'A' && s[i] <= 'Z') || (s[i] >= 'a' && s[i] <= 'z')) {
+            while (++i < sl && ((s[i] >= 'a' && s[i] <= 'z') || s[i] == '*' || 
+                        s[i] == '\''));
+            QString elname = s.mid(j, i-j);
+            j = i;
+            while (i < sl && ((s[i] <= '9' && s[i] >= '0') || s[i] == '.')) i++;
+            double suffix = (i == j ? 1 : s.mid(j, i-j).toDouble(&ok)); 
+            if (! ok || suffix == 0) {
+                delete elstemp;
+                return QString ("Bad formula."); // ERROR
+            }
+            SubUnit* group = elstable->find(elname);
+            if (group == 0) {
+                delete elstemp;
+                return QString ("Undefined symbol: ") + elname; //ERROR
+            }
+            group->addTo(*elstemp, suffix);
+        } else if (s[i] == '+') {
+            if (elstemp->isEmpty()) {
+                delete elstemp;
+                return QString ("Bad formula."); //ERROR
+            }
+            elstemp->addTo(*els, prefix);
+            delete elstemp;
+            errors = KMolCalc::readGroup(s.mid(i+1, sl-i-1), els);
+            return errors;
+        } else {
+            delete elstemp;
+            return QString ("Bad formula."); //ERROR
+        }
+    }
+    elstemp->addTo(*els, prefix);
+    delete elstemp;
+    return errors;
+}
+
+/**
+ * Calculate and return the molecular weight of the current chemical formula.
+ */
+double KMolCalc::getWeight() {
+  if (weight == -1) weight = elements->getWeight(elstable);
+  return weight;
+}
+
+/**
+ * Return the elemental composition of the current formula, as a string of tab-separated
+ * element - percentage pairs, separated by newlines.
+ */
+QString KMolCalc::getEA() {
+  if (weight == -1) weight = elements->getWeight(elstable);
+  if (weight == -1) return QString("ERROR: Couldn't get Mw..."); // ERROR
+  return elements->getEA(elstable, weight);
+}
+
+/**
+ * Return the empirical formula of the current compound as a QString.
+ */
+QString KMolCalc::getEmpFormula() {
+  return elements->getEmpFormula();
+}
+
+// Read the element definition file.
+void KMolCalc::readMwfile(QFile& f) {
+  if (! f.open(IO_ReadOnly)) return; //ERROR
+  QTextStream fs (&f);
+  QString line;
+  while (! fs.eof()) {
+    line = fs.readLine();
+    SubUnit* s = SubUnit::makeSubUnit(line);
+	elstable->replace(s->getName(), s);
+  }
+  f.close();
+}
+
+/**
+ * Save the element definitions file.
+ */
+void KMolCalc::writeElstable() {
+  QFile f(mwfile);
+  if (! f.open(IO_WriteOnly)) return; //ERROR
+  QTextStream fs (&f);
+  QString line;
+  QDictIterator<SubUnit> it(*elstable);
+  while (it.current()) {
+    it.current()->writeOut(line);
+    fs << line << endl;
+    ++it;
+  }
+  f.close();
+}
+
+/**
+ * Remove a group or element definition from ELSTABLE.
+ */
+void KMolCalc::undefineGroup (const QString& name) {
+  elstable->remove (name);
+}
+
+/**
+ * Add a new element name - atomic weight record to the ELSTABLE hashtable. Assumes 
+ * NAME has valid syntax.
+
+ */
+void KMolCalc::defineElement (const QString& name, double weight) {
+  Element* el = new Element(name, weight);
+  elstable->replace(name, el);
+}
+
+/**
+ * Add a new group definition to the ELSTABLE. Returns 0 if OK, -1 if parsing FORMULA
+ * fails. Assumes the syntax of grpname is correct.
+ */
+QString KMolCalc::defineGroup (const QString& grpname, const QString& formula) {
+  ElementList* els = new ElementList(grpname);
+  QString error = readGroup(formula, els);
+  if (error != "OK") return error;
+  if (els->contains(grpname)) return QString("Can't define a group recursively!\n");
+  elstable->replace(grpname, els);
+  return QString("OK");
+}
--
cgit v0.9.0.2