/*
* Copyright 2013 serso aka se.solovyev
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* Contact details
*
* Email: se.solovyev@gmail.com
* Site: http://se.solovyev.org
*/
package org.solovyev.android.calculator;
import jscl.math.function.Function;
import jscl.math.function.IConstant;
import org.solovyev.android.calculator.math.MathType;
import org.solovyev.android.calculator.text.TextProcessor;
import org.solovyev.common.msg.MessageType;
import javax.annotation.Nonnull;
import javax.inject.Inject;
import javax.inject.Singleton;
import java.util.ArrayList;
import java.util.List;
@Singleton
public class ToJsclTextProcessor implements TextProcessor<PreparedExpression, String> {
@Nonnull
private static final Integer MAX_DEPTH = 20;
@Inject
Engine engine;
@Inject
public ToJsclTextProcessor() {
}
private static PreparedExpression processWithDepth(@Nonnull String s, int depth, @Nonnull List<IConstant> undefinedVars, @Nonnull Engine engine) throws ParseException {
return replaceVariables(processExpression(s, engine).toString(), depth, undefinedVars, engine);
}
@Nonnull
private static StringBuilder processExpression(@Nonnull String s, @Nonnull Engine engine) throws ParseException {
final StringBuilder result = new StringBuilder();
final MathType.Results results = new MathType.Results();
MathType.Result mathTypeResult = null;
MathType.Result mathTypeBefore = null;
final LiteNumberBuilder nb = new LiteNumberBuilder(engine);
for (int i = 0; i < s.length(); i++) {
if (s.charAt(i) == ' ') continue;
results.release(mathTypeBefore);
mathTypeBefore = mathTypeResult == null ? null : mathTypeResult;
mathTypeResult = MathType.getType(s, i, nb.isHexMode(), engine);
nb.process(mathTypeResult);
if (mathTypeBefore != null) {
final MathType current = mathTypeResult.type;
if (current.isNeedMultiplicationSignBefore(mathTypeBefore.type)) {
result.append("*");
}
}
if (mathTypeBefore != null &&
(mathTypeBefore.type == MathType.function || mathTypeBefore.type == MathType.operator) &&
App.find(MathType.groupSymbols, s, i) != null) {
final String functionName = mathTypeBefore.match;
final Function function = engine.getFunctionsRegistry().get(functionName);
if (function == null || function.getMinParameters() > 0) {
throw new ParseException(i, s, new CalculatorMessage(CalculatorMessages.msg_005, MessageType.error, mathTypeBefore.match));
}
}
i = mathTypeResult.processToJscl(result, i);
}
return result;
}
@Nonnull
private static PreparedExpression replaceVariables(@Nonnull final String s, int depth, @Nonnull List<IConstant> undefinedVars, @Nonnull Engine engine) throws ParseException {
if (depth >= MAX_DEPTH) {
throw new ParseException(s, new CalculatorMessage(CalculatorMessages.msg_006, MessageType.error));
} else {
depth++;
}
final StringBuilder result = new StringBuilder();
for (int i = 0; i < s.length(); i++) {
int offset = 0;
String functionName = App.find(MathType.function.getTokens(engine), s, i);
if (functionName == null) {
String operatorName = App.find(MathType.operator.getTokens(engine), s, i);
if (operatorName == null) {
String varName = App.find(engine.getVariablesRegistry().getNames(), s, i);
if (varName != null) {
final IConstant var = engine.getVariablesRegistry().get(varName);
if (var != null) {
if (!var.isDefined()) {
undefinedVars.add(var);
result.append(varName);
offset = varName.length();
} else {
final String value = var.getValue();
if (value == null) throw new AssertionError();
if (var.getDoubleValue() != null) {
//result.append(value);
// NOTE: append varName as JSCL engine will convert it to double if needed
result.append(varName);
} else {
result.append("(").append(processWithDepth(value, depth, undefinedVars, engine)).append(")");
}
offset = varName.length();
}
}
}
} else {
result.append(operatorName);
offset = operatorName.length();
}
} else {
result.append(functionName);
offset = functionName.length();
}
if (offset == 0) {
result.append(s.charAt(i));
} else {
i += offset - 1;
}
}
return new PreparedExpression(result.toString(), undefinedVars);
}
@Override
@Nonnull
public PreparedExpression process(@Nonnull String s) throws ParseException {
return processWithDepth(s, 0, new ArrayList<IConstant>(), engine);
}
}