symbolic calculations

This commit is contained in:
serso 2011-10-22 17:59:40 +04:00
parent fcbed15837
commit b3591242e6
2 changed files with 116 additions and 10 deletions

View File

@ -2,11 +2,14 @@ package org.solovyev.android.calculator.model;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.solovyev.android.calculator.StartsWithFinder;
import org.solovyev.android.calculator.math.Functions;
import org.solovyev.android.calculator.math.MathType;
import org.solovyev.common.utils.CollectionsUtils;
import org.solovyev.common.utils.Finder;
import java.util.Arrays;
import java.util.List;
/**
* User: serso
* Date: 10/20/11
@ -50,11 +53,12 @@ public class FromJsclSimplifyTextProcessor implements TextProcessor<String> {
replaceSystemVars(sb, number);
if (mathType == MathType.constant) {
if (mathType == MathType.constant){
sb.append(mathTypeResult.getMatch());
i += mathTypeResult.getMatch().length() - 1;
} else if (ch == '*') {
sb.append("×");
} else if ( mathType == MathType.function) {
sb.append(fromJsclFunction(mathTypeResult.getMatch()));
i += mathTypeResult.getMatch().length() - 1;
} else {
sb.append(ch);
}
@ -73,10 +77,87 @@ public class FromJsclSimplifyTextProcessor implements TextProcessor<String> {
replaceSystemVars(sb, number);
return removeMultiplicationSigns(sb.toString());
}
@NotNull
private static String fromJsclFunction(@NotNull String function) {
final String result;
if (function.equals(Functions.LN_JSCL)) {
result = Functions.LN;
} else if (function.equals(Functions.SQRT_JSCL)) {
result = Functions.SQRT;
} else {
result = function;
}
return result;
}
@NotNull
private String removeMultiplicationSigns(String s) {
final StringBuilder sb = new StringBuilder();
MathType.Result mathTypeBefore;
MathType.Result mathType = null;
MathType.Result mathTypeAfter = null;
for (int i = 0; i < s.length(); i++) {
mathTypeBefore = mathType;
if (mathTypeAfter == null) {
mathType = MathType.getType(s, i);
} else {
mathType = mathTypeAfter;
}
char ch = s.charAt(i);
if (ch == '*') {
if (i + 1 < s.length()) {
mathTypeAfter = MathType.getType(s, i + 1);
} else {
mathTypeAfter = null;
}
if (needMultiplicationSign(mathTypeBefore == null ? null : mathTypeBefore.getMathType(), mathTypeAfter == null ? null : mathTypeAfter.getMathType())) {
sb.append("×");
}
} else {
if (mathType.getMathType() == MathType.constant || mathType.getMathType() == MathType.function) {
sb.append(mathType.getMatch());
i += mathType.getMatch().length() - 1;
} else {
sb.append(ch);
}
mathTypeAfter = null;
}
}
return sb.toString();
}
private void replaceSystemVars(StringBuilder sb, String number) {
private final List<MathType> mathTypes = Arrays.asList(MathType.function, MathType.constant);
private boolean needMultiplicationSign(@Nullable MathType mathTypeBefore, @Nullable MathType mathTypeAfter) {
if (mathTypeBefore == null || mathTypeAfter == null) {
return true;
} else if (mathTypes.contains(mathTypeBefore) || mathTypes.contains(mathTypeAfter)) {
return false;
} else if ( mathTypeBefore == MathType.close_group_symbol ) {
return false;
} else if ( mathTypeAfter == MathType.open_group_symbol ) {
return false;
}
return true;
}
@Nullable
private MathType replaceSystemVars(StringBuilder sb, String number) {
MathType result = null;
if (number != null) {
final String finalNumber = number;
final Var var = CollectionsUtils.get(CalculatorEngine.instance.getVarsRegister().getSystemVars(), new Finder<Var>() {
@ -89,8 +170,11 @@ public class FromJsclSimplifyTextProcessor implements TextProcessor<String> {
if (var != null) {
sb.delete(sb.length() - number.length(), sb.length());
sb.append(var.getName());
result = MathType.constant;
}
}
return result;
}
}

View File

@ -1,10 +1,8 @@
package org.solovyev.android.calculator.model;
import org.junit.Assert;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
import org.solovyev.android.calculator.jscl.JsclOperation;
/**
* User: serso
@ -21,12 +19,36 @@ public class FromJsclSimplifyTextProcessorTest {
@Test
public void testProcess() throws Exception {
FromJsclSimplifyTextProcessor tp = new FromJsclSimplifyTextProcessor();
Assert.assertEquals("t11×e", tp.process("t11*2.718281828459045"));
Assert.assertEquals("t11e", tp.process("t11*2.718281828459045"));
Assert.assertEquals("e", tp.process("2.718281828459045"));
Assert.assertEquals("te×e", tp.process("t2.718281828459045*2.718281828459045"));
Assert.assertEquals("tee", tp.process("t2.718281828459045*2.718281828459045"));
CalculatorEngine.instance.getVarsRegister().addVar(null, new Var.Builder("t2.718281828459045", "2"));
Assert.assertEquals("t2.718281828459045×e", tp.process("t2.718281828459045*2.718281828459045"));
Assert.assertEquals("t2.718281828459045e", tp.process("t2.718281828459045*2.718281828459045"));
Assert.assertEquals("t×", tp.process("t*"));
Assert.assertEquals("×t", tp.process("*t"));
Assert.assertEquals("t×2", tp.process("t*2"));
Assert.assertEquals("2×t", tp.process("2*t"));
CalculatorEngine.instance.getVarsRegister().addVar(null, new Var.Builder("t", (String)null));
Assert.assertEquals("t×", tp.process("t*"));
Assert.assertEquals("×t", tp.process("*t"));
Assert.assertEquals("t2", tp.process("t*2"));
Assert.assertEquals("2t", tp.process("2*t"));
Assert.assertEquals("t^2×2", tp.process("t^2*2"));
Assert.assertEquals("2t^2", tp.process("2*t^2"));
Assert.assertEquals("t^[2×2t]", tp.process("t^[2*2*t]"));
Assert.assertEquals("2t^2[2t]", tp.process("2*t^2[2*t]"));
CalculatorEngine.instance.getVarsRegister().addVar(null, new Var.Builder("k", (String)null));
Assert.assertEquals("(t+2k)[k+2t]", tp.process("(t+2*k)*[k+2*t]"));
Assert.assertEquals("(te+2k)e[k+2te]", tp.process("(t*e+2*k)*e*[k+2*t*e]"));
Assert.assertEquals("tln(3)", tp.process("t*log(3)"));
Assert.assertEquals("t√(3)", tp.process("t*sqrt(3)"));
}
}