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package G4ip;
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/** Class for propositional formulae.<p>
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* @author Christian Urban
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*/
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public class Form {
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public case False();
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public case And(Form c1,Form c2);
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public case Or(Form c1,Form c2);
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public case Imp(Form c1,Form c2);
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//public case Equ(Form c1,Form c2);
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public case Atm(String c);
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public String toString() {
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switch(this) {
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case False():
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return "false";
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case And(Form c1,Form c2):
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return "(" + c1.toString() + " & " + c2.toString() + ")";
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case Or(Form c1,Form c2):
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return "(" + c1.toString() + " v " + c2.toString() + ")";
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case Imp(Form c1,Form c2):
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return "(" + c1.toString() + " -> " + c2.toString() + ")";
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case Atm(String c):
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return c;
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}
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}
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// for testing
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public String internalString() {
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switch(this) {
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case False():
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return "false";
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case And(Form c1,Form c2):
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return "And(" + c1.internalString() + "," + c2.internalString() + ")";
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case Or(Form c1,Form c2):
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return "Or(" + c1.internalString() + "," + c2.internalString() + ")";
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case Imp(Form c1,Form c2):
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return "Imp(" + c1.internalString() + "," + c2.internalString() + ")";
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case Atm(String c):
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return "Atm(\"p"+ c + "\")";
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}
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}
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}
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