/// <param name="l"> Left side. </param>
/// <param name="r"> Right side. </param>
public Equation(Formula[] l, Formula[] r)
{
left = new Formula[l.Length];
leftCoeff = new int[l.Length];
right = new Formula[r.Length];
rightCoeff = new int[r.Length];
//copies the formulas instead of referencing
//(reduces side-effects of using Equation class)
for(int i = 0; i < l.Length; i++) {
if(l[i] == null || l[i].Size == 0) {
throw new ArgumentException("Invalid formula in equation.");
}
left[i] = new Formula(l[i]);
leftCoeff[i] = 1;
}
for(int i = 0; i < r.Length; i++) {
if(r[i] == null || r[i].Size == 0) {
throw new ArgumentException("Invalid formula in equation.");
}
right[i] = new Formula(r[i]);
rightCoeff[i] = 1;
}
}
//gets a Formula starting from next
//hydrates arent handled
private Formula GetFormula()
{
Formula formula = new Formula();
while(BoundCheck) {
//end inner formula, return this
if(chars[next] == ')') {
Next();
return formula;
}
//start inner formula
else if(chars[next] == '(') {
Next();
//gets formula
Formula f1 = GetFormula();
//gets the number after the closing parens
//i.e. get 7 from (CO2)7
if(f1 == null ) return null;
int n = GetNumber();
//adds it to the main formula
formula.MergeFormula(f1.Factor(n));
}
//start symbol
else if (char.IsUpper(chars[next])){
Element e = GetSymbol();
if(e == null) {
continue;
}
int n = GetNumber();
formula.Add(new NElements(n, e));
//error or end of data
} else {
return null;
}
}
return formula;
}
/// <summary> Copy constructor. </summary>
/// <param name="f"> Formula to copy. </param>
public Formula(Formula f)
{
MergeFormula(f);
}
/// <summary> Merges this formula with other.
/// Result is this object; other isn't affected. </summary>
/// <example> H2O merged with H2 will result in H4O </example>
public void MergeFormula(Formula other)
{
foreach(NElements ne in other.elementMap.Values) {
Add(new NElements(ne));
}
}
//returns an equivalent formula that takes into account all
//formulas and coefficients
//i.e. [O2,2H2] results in H4O2
private static Formula CountMolecules(Formula[] formulas, int[] coeff)
{
Formula f = new Formula();
for(int i = 0; i < formulas.Length; i++) {
//creates new equivalent formula without coefficient
Formula f2 = new Formula(formulas[i]);
//merges the formula into f
f.MergeFormula(f2.Factor(coeff[i]));
}
return f;
}
