summaryrefslogtreecommitdiffstats
path: root/src/function.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/function.cpp')
-rw-r--r--src/function.cpp298
1 files changed, 298 insertions, 0 deletions
diff --git a/src/function.cpp b/src/function.cpp
new file mode 100644
index 0000000..70c4f1c
--- /dev/null
+++ b/src/function.cpp
@@ -0,0 +1,298 @@
+/*
+ * function.cpp - part of abakus
+ * Copyright (C) 2004, 2005 Michael Pyne <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02110-1301 USA
+ */
+#include "numerictypes.h"
+
+#include <kdebug.h>
+
+#include <qvaluevector.h>
+#include <qstring.h>
+#include <qregexp.h>
+
+#include <math.h>
+
+#include "function.h"
+#include "node.h"
+#include "valuemanager.h"
+#include "hmath.h"
+
+// Used to try and avoid recursive function definitions
+class DupFinder : public NodeFunctor
+{
+ public:
+ DupFinder(const QString &nameToFind) :
+ m_name(nameToFind), m_valid(true)
+ {
+ }
+
+ virtual ~DupFinder() { }
+
+ bool isValid() const { return m_valid; }
+
+ virtual void operator()(const Node *node)
+ {
+ if(!m_valid)
+ return;
+
+ const BaseFunction *fn = dynamic_cast<const BaseFunction *>(node);
+ if(fn && fn->name() == m_name)
+ m_valid = false; // Duplicate detected
+ }
+
+ private:
+ QString m_name;
+ bool m_valid;
+};
+
+// Define static member for FunctionManager
+FunctionManager *FunctionManager::m_manager = 0;
+
+FunctionManager *FunctionManager::instance()
+{
+ if(!m_manager)
+ m_manager = new FunctionManager;
+
+ return m_manager;
+}
+
+FunctionManager::FunctionManager(QObject *parent, const char *name) :
+ QObject(parent, name)
+{
+ m_dict.setAutoDelete(true);
+}
+
+// Dummy return value to enable static initialization in the DECL_*()
+// macros.
+bool FunctionManager::addFunction(const QString &name, function_t fn, const QString &desc)
+{
+ Function *newFn = new Function;
+ QRegExp returnTrigRE("^a(cos|sin|tan)");
+ QRegExp needsTrigRE("^(cos|sin|tan)");
+ QString fnName(name);
+
+ newFn->name = name;
+ newFn->description = desc;
+ newFn->fn = fn;
+ newFn->userDefined = false;
+ newFn->returnsTrig = fnName.contains(returnTrigRE);
+ newFn->needsTrig = fnName.contains(needsTrigRE);
+
+ m_dict.insert(name, newFn);
+
+ return false;
+}
+
+#define DECLARE_FUNC(name, fn, desc) bool dummy##name = FunctionManager::instance()->addFunction(#name, fn, desc)
+
+// Declares a function name that is implemented by the function of a different
+// name. e.g. atan -> Abakus::number_t::arctan()
+#define DECLARE_FUNC2(name, fnName, desc) DECLARE_FUNC(name, &Abakus::number_t::fnName, desc)
+
+// Declares a function name that is implemented by the function of the
+// same base name.
+#define DECLARE_FUNC1(name, desc) DECLARE_FUNC2(name, name, desc)
+
+DECLARE_FUNC1(sin, "Trigonometric sine");
+DECLARE_FUNC1(cos, "Trigonometric cosine");
+DECLARE_FUNC1(tan, "Trigonometric tangent");
+
+DECLARE_FUNC1(sinh, "Hyperbolic sine");
+DECLARE_FUNC1(cosh, "Hyperbolic cosine");
+DECLARE_FUNC1(tanh, "Hyperbolic tangent");
+
+DECLARE_FUNC1(atan, "Inverse tangent");
+DECLARE_FUNC1(acos, "Inverse cosine");
+DECLARE_FUNC1(asin, "Inverse sine");
+
+DECLARE_FUNC1(asinh, "Inverse hyperbolic sine");
+DECLARE_FUNC1(acosh, "Inverse hyperbolic cosine");
+DECLARE_FUNC1(atanh, "Inverse hyperbolic tangent");
+
+DECLARE_FUNC1(abs, "Absolute value of number");
+DECLARE_FUNC1(sqrt, "Square root");
+DECLARE_FUNC1(ln, "Natural logarithm (base e)");
+DECLARE_FUNC1(log, "Logarithm (base 10)");
+DECLARE_FUNC1(exp, "Natural exponential function");
+
+DECLARE_FUNC1(round, "Round to nearest number");
+DECLARE_FUNC1(ceil, "Nearest greatest integer");
+DECLARE_FUNC1(floor, "Nearest lesser integer");
+DECLARE_FUNC2(int, integer, "Integral part of number");
+DECLARE_FUNC1(frac, "Fractional part of number");
+
+Function *FunctionManager::function(const QString &name)
+{
+ return m_dict[name];
+}
+
+// Returns true if the named identifier is a function, false otherwise.
+bool FunctionManager::isFunction(const QString &name)
+{
+ return function(name) != 0;
+}
+
+bool FunctionManager::isFunctionUserDefined(const QString &name)
+{
+ const Function *fn = function(name);
+ return (fn != 0) && (fn->userDefined);
+}
+
+bool FunctionManager::addFunction(BaseFunction *fn, const QString &dependantVar)
+{
+ // First see if this function is recursive
+ DupFinder dupFinder(fn->name());
+ UnaryFunction *unFunction = dynamic_cast<UnaryFunction *>(fn);
+ if(unFunction && unFunction->operand()) {
+ unFunction->operand()->applyMap(dupFinder);
+ if(!dupFinder.isValid())
+ return false;
+ }
+
+ // Structure holds extra data needed to call the user defined
+ // function.
+ UserFunction *newFn = new UserFunction;
+ newFn->sequenceNumber = m_dict.count();
+ newFn->fn = fn;
+ newFn->varName = QString(dependantVar);
+
+ // Now setup the Function data structure that holds the information
+ // we need to access and call the function later.
+ Function *fnTabEntry = new Function;
+ fnTabEntry->name = fn->name();
+ fnTabEntry->userFn = newFn;
+ fnTabEntry->returnsTrig = false;
+ fnTabEntry->needsTrig = false;
+ fnTabEntry->userDefined = true;
+
+ if(m_dict.find(fn->name()))
+ emit signalFunctionRemoved(fn->name());
+
+ m_dict.replace(fn->name(), fnTabEntry);
+ emit signalFunctionAdded(fn->name());
+
+ return true;
+}
+
+void FunctionManager::removeFunction(const QString &name)
+{
+ Function *fn = function(name);
+
+ // If we remove a function, we need to decrement the sequenceNumber of
+ // functions after this one.
+ if(fn && fn->userDefined) {
+ int savedSeqNum = fn->userFn->sequenceNumber;
+
+ // Emit before we actually remove it so that the info on the function
+ // can still be looked up.
+ emit signalFunctionRemoved(name);
+
+ delete fn->userFn;
+ fn->userFn = 0;
+ m_dict.remove(name);
+
+ QDictIterator<Function> it(m_dict);
+ for (; it.current(); ++it) {
+ UserFunction *userFn = it.current()->userDefined ? it.current()->userFn : 0;
+ if(userFn && userFn->sequenceNumber > savedSeqNum)
+ --it.current()->userFn->sequenceNumber;
+ }
+ }
+}
+
+QStringList FunctionManager::functionList(FunctionManager::FunctionType type)
+{
+ QDictIterator<Function> it(m_dict);
+ QStringList functions;
+
+ switch(type) {
+ case Builtin:
+ for(; it.current(); ++it)
+ if(!it.current()->userDefined)
+ functions += it.current()->name;
+ break;
+
+ case UserDefined:
+ // We want to return the function names in the order they were
+ // added.
+ {
+ QValueVector<Function *> fnTable(m_dict.count(), 0);
+ QValueVector<int> sequenceNumberTable(m_dict.count(), -1);
+
+ // First find out what sequence numbers we have.
+ for(; it.current(); ++it)
+ if(it.current()->userDefined) {
+ int id = it.current()->userFn->sequenceNumber;
+ fnTable[id] = it.current();
+ sequenceNumberTable.append(id);
+ }
+
+ // Now sort the sequence numbers and return the ordered list
+ qHeapSort(sequenceNumberTable.begin(), sequenceNumberTable.end());
+
+ for(unsigned i = 0; i < sequenceNumberTable.count(); ++i)
+ if(sequenceNumberTable[i] >= 0)
+ functions += fnTable[sequenceNumberTable[i]]->name;
+ }
+ break;
+
+ case All:
+ functions += functionList(Builtin);
+ functions += functionList(UserDefined);
+ break;
+ }
+
+ return functions;
+}
+
+// Applies the function identified by func, using value as a parameter.
+Abakus::number_t evaluateFunction(const Function *func, const Abakus::number_t value)
+{
+ if(func->userDefined) {
+ // Pull real entry from userFunctionTable
+ UserFunction *realFunction = func->userFn;
+
+ bool wasSet = ValueManager::instance()->isValueSet(realFunction->varName);
+ Abakus::number_t oldValue;
+ if(wasSet)
+ oldValue = ValueManager::instance()->value(realFunction->varName);
+
+ ValueManager::instance()->setValue(realFunction->varName, value);
+ Abakus::number_t result = realFunction->fn->value();
+
+ if(wasSet)
+ ValueManager::instance()->setValue(realFunction->varName, oldValue);
+ else
+ ValueManager::instance()->removeValue(realFunction->varName);
+
+ return result;
+ }
+
+ return (value.*(func->fn))();
+}
+
+void setTrigMode(Abakus::TrigMode mode)
+{
+ Abakus::m_trigMode = mode;
+}
+
+Abakus::TrigMode trigMode()
+{
+ return Abakus::m_trigMode;
+}
+
+#include "function.moc"
generated by cgit v1.2.1 (git 2.18.0) at 2024-12-22 19:36:29 +0000