+#include "paranoidnumber.h"
+
+#include <sstream>
+#include <fenv.h>
+#include "log.h"
+
+using namespace std;
+namespace IPDF
+{
+
+
+ParanoidNumber::ParanoidNumber(const char * str) : m_value(0), m_op(ADD), m_next(NULL)
+{
+ int dp = 0;
+ int end = 0;
+ while (str[dp] != '\0' && str[dp] != '.')
+ {
+ ++dp;
+ ++end;
+ }
+ while (str[end] != '\0')
+ ++end;
+
+ ParanoidNumber m(1);
+ for (int i = dp-1; i >= 0; --i)
+ {
+ ParanoidNumber b(str[i]-'0');
+ b*=m;
+ this->operator+=(b);
+ m*=10;
+ }
+ ParanoidNumber n(1);
+ for (int i = dp+1; i < end; ++i)
+ {
+ n/=10;
+ ParanoidNumber b(str[i]-'0');
+ b*=n;
+ this->operator+=(b);
+ }
+
+}
+
+ParanoidNumber * ParanoidNumber::InsertAfter(float value, Optype op)
+{
+ return InsertAfter(new ParanoidNumber(value, op));
+}
+
+ParanoidNumber * ParanoidNumber::InsertAfter(ParanoidNumber * insert)
+{
+ //Debug("Insert {%s} after {%f, %s}",insert->Str().c_str(),
+ // m_value, g_opstr[m_op]);
+ ParanoidNumber * n = m_next;
+ m_next = insert;
+
+ ParanoidNumber * p = m_next;
+ while (p->m_next != NULL)
+ p = p->m_next;
+ p->m_next = n;
+
+ return m_next;
+}
+
+
+ParanoidNumber & ParanoidNumber::operator=(const ParanoidNumber & a)
+{
+ const ParanoidNumber * na = &a;
+ ParanoidNumber * nb = this;
+ ParanoidNumber * p = NULL;
+ while (na != NULL && nb != NULL)
+ {
+ nb->m_value = na->m_value;
+ nb->m_op = na->m_op;
+ na = na->m_next;
+ p = nb;
+ nb = nb->m_next;
+
+ }
+
+ while (na != NULL) // => nb == NULL
+ {
+ InsertAfter(na->m_value, na->m_op);
+ na = na->m_next;
+ }
+
+ if (nb != NULL)
+ {
+ if (p != NULL)
+ p->m_next = NULL;
+ delete nb;
+ }
+ return *this;
+}
+
+ParanoidNumber & ParanoidNumber::operator+=(const ParanoidNumber & a)
+{
+ ParanoidNumber * insert = new ParanoidNumber(a, ADD);
+ if (m_next == NULL || m_next->m_op == ADD || m_next->m_op == SUBTRACT)
+ {
+ InsertAfter(insert);
+ Simplify();
+ return *this;
+ }
+
+ if (m_next->m_op == MULTIPLY) // (a*b) + c == (a+[c/b]) * b
+ insert->operator/=(*m_next);
+ else
+ insert->operator*=(*m_next); // (a/b) + c == (a+[c*b])/b
+
+ if (insert->m_next != NULL) // neither of the above simplified
+ {
+ //Debug("{%s} did not simplify, change back to {%s}", insert->Str().c_str(), a.Str().c_str());
+ insert->operator=(a); // Just add as is
+ insert->m_op = ADD;
+ ParanoidNumber * n = this;
+ while (n->m_next != NULL)
+ n = n->m_next;
+ n->InsertAfter(insert);
+ }
+ else
+ {
+ InsertAfter(insert);
+ }
+ Simplify();
+ return *this;
+}
+ParanoidNumber & ParanoidNumber::operator-=(const ParanoidNumber & a)
+{
+ ParanoidNumber * insert = new ParanoidNumber(a, SUBTRACT);
+ if (m_next == NULL || m_next->m_op == ADD || m_next->m_op == SUBTRACT)
+ {
+ InsertAfter(insert);
+ Simplify();
+ return *this;
+ }
+
+ if (m_next->m_op == MULTIPLY) // (a*b) - c == (a-[c/b]) * b
+ insert->operator/=(*m_next);
+ else
+ insert->operator*=(*m_next); // (a/b) - c == (a-[c*b])/b
+
+ if (insert->m_next != NULL) // neither of the above simplified
+ {
+ //Debug("{%s} did not simplify, change back to {%s}", insert->Str().c_str(), a.Str().c_str());
+ insert->operator=(a); // Just add as is
+ insert->m_op = SUBTRACT;
+ ParanoidNumber * n = this;
+ while (n->m_next != NULL)
+ n = n->m_next;
+ n->InsertAfter(insert);
+ }
+ else
+ {
+ InsertAfter(insert);
+ }
+ Simplify();
+ return *this;
+}
+
+ParanoidNumber & ParanoidNumber::operator*=(const ParanoidNumber & a)
+{
+ ParanoidNumber * n = m_next;
+ while (n != NULL)
+ {
+ if (n->m_op == ADD || n->m_op == SUBTRACT)
+ {
+ n->operator*=(a);
+ break;
+ }
+ n = n->m_next;
+ }
+
+ InsertAfter(new ParanoidNumber(a, MULTIPLY));
+ Simplify();
+ return *this;
+}
+
+
+ParanoidNumber & ParanoidNumber::operator/=(const ParanoidNumber & a)
+{
+ ParanoidNumber * n = m_next;
+ while (n != NULL)
+ {
+ if (n->m_op == ADD || n->m_op == SUBTRACT)
+ {
+ n->operator/=(a);
+ break;
+ }
+ n = n->m_next;
+ }
+
+ InsertAfter(new ParanoidNumber(a, DIVIDE));
+ Simplify();
+ return *this;
+}
+
+double ParanoidNumber::ToDouble() const
+{
+ double value = (m_op == SUBTRACT) ? -m_value : m_value;
+ const ParanoidNumber * n = m_next;
+ while (n != NULL)
+ {
+ switch (n->m_op)
+ {
+ case ADD:
+ case SUBTRACT:
+ return value + n->ToDouble();
+ break;
+ case MULTIPLY:
+ value *= n->m_value;
+ break;
+ case DIVIDE:
+ value /= n->m_value;
+ break;
+ }
+ n = n->m_next;
+ }
+ return value;
+}
+
+void ParanoidNumber::Simplify()
+{
+ ParanoidNumber * n = m_next;
+ ParanoidNumber * p = this;
+
+ while (n != NULL)
+ {
+
+ float a = p->m_value;
+ switch (n->m_op)
+ {
+ case ADD:
+ n->Simplify();
+ feclearexcept(FE_ALL_EXCEPT);
+ a += n->m_value;
+ break;
+ case SUBTRACT:
+ n->Simplify();
+ feclearexcept(FE_ALL_EXCEPT);
+ a -= n->m_value;
+ break;
+ case MULTIPLY:
+ feclearexcept(FE_ALL_EXCEPT);
+ a *= n->m_value;
+ break;
+ case DIVIDE:
+ feclearexcept(FE_ALL_EXCEPT);
+ a /= n->m_value;
+ break;
+
+ }
+ // can't merge p and n
+ if (fetestexcept(FE_ALL_EXCEPT))
+ {
+ while (n != NULL && n->m_op != ADD && n->m_op != SUBTRACT)
+ n = n->m_next;
+ if (n != NULL)
+ n->Simplify();
+ return;
+ }
+ else
+ {
+ // merge n into p
+ p->m_value = a;
+ p->m_next = n->m_next;
+ n->m_next = NULL;
+ delete n;
+ n = p->m_next;
+ }
+ //Debug(" -> {%s}", Str().c_str());
+ }
+}
+
+string ParanoidNumber::Str() const
+{
+ string result("");
+ switch (m_op)
+ {
+ case ADD:
+ result += " +";
+ break;
+ case SUBTRACT:
+ result += " -";
+ break;
+ case MULTIPLY:
+ result += " *";
+ break;
+ case DIVIDE:
+ result += " /";
+ break;
+ }
+ stringstream s("");
+ s << m_value;
+ result += s.str();
+ if (m_next != NULL)
+ result += m_next->Str();
+ return result;
+}
+
+}
git.ucc.asn.au / ipdf / code.git / commitdiff
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