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Embeddable expression language for Java.
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/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2019 Twineworks GmbH
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.twineworks.tweakflow.lang.interpreter.ops;

import com.twineworks.tweakflow.lang.ast.expressions.DebugNode;
import com.twineworks.tweakflow.lang.ast.expressions.ExpressionNode;
import com.twineworks.tweakflow.lang.interpreter.EvaluationContext;
import com.twineworks.tweakflow.lang.interpreter.Stack;
import com.twineworks.tweakflow.lang.values.Value;
import com.twineworks.tweakflow.lang.values.Values;

import java.util.ArrayList;
import java.util.Arrays;

final public class DebugOp implements ExpressionOp {

  private final DebugNode node;
  private final ArrayList debugOps;
  private final Value[] debugValues;

  public DebugOp(DebugNode node) {
    this.node = node;
    ArrayList exp = node.getExpressions();
    debugValues = new Value[exp.size()];

    this.debugOps = new ArrayList<>(exp.size());
    for (ExpressionNode expressionNode : exp) {
      debugOps.add(expressionNode.getOp());
    }
  }

  @Override
  public Value eval(Stack stack, EvaluationContext context) {

    Value debugValue = Values.NIL;

    for (int i = 0; i < debugOps.size(); i++) {
      ExpressionOp debugOp = debugOps.get(i);
      debugValue = debugOp.eval(stack, context);
      debugValues[i] = debugValue;
    }
    context.getDebugHandler().debug(debugValues);
    Arrays.fill(debugValues, null);
    return debugValue;

  }

  // debugged values never fold during analysis
  @Override
  public boolean isConstant() {
    return false;
  }

  @Override
  public ExpressionOp specialize() {
    return new DebugOp(node);
  }

  @Override
  public ExpressionOp refresh() {
    return new DebugOp(node);
  }

}