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+/**
+ * Arara, the cool TeX automation tool
+ * Copyright (c) 2012 -- 2018, Paulo Roberto Massa Cereda
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the project's author nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
+ * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+package com.github.cereda.arara.model;
+
+import com.github.cereda.arara.controller.ConfigurationController;
+import com.github.cereda.arara.controller.LanguageController;
+import com.github.cereda.arara.utils.CommonUtils;
+import com.github.cereda.arara.utils.Methods;
+import java.util.HashMap;
+import java.util.Map;
+import org.mvel2.templates.TemplateRuntime;
+
+/**
+ * Implements the evaluator model, on which a conditional can be analyzed and
+ * processed.
+ * @author Paulo Roberto Massa Cereda
+ * @version 4.0
+ * @since 4.0
+ */
+public class Evaluator {
+
+ // this attribute holds the maximum number of
+ // loops arara will accept; it's like
+ // reaching infinity
+ private final long loops;
+
+ // the counter for the current execution, it
+ // helps us keep track of the number of times
+ // this evaluation has happened, and also to
+ // prevent potential infinite loops
+ private long counter;
+
+ // a flag that indicates the
+ // evaluation to halt regardless
+ // of the the result
+ private boolean halt;
+
+ // the application messages obtained from the
+ // language controller
+ private static final LanguageController messages =
+ LanguageController.getInstance();
+
+ /**
+ * Constructor. It gets the application maximum number of loops and reset
+ * all counters.
+ */
+ public Evaluator() {
+ loops = (Long) ConfigurationController.getInstance().
+ get("execution.loops");
+ counter = 0;
+ halt = false;
+ }
+
+ /**
+ * Evaluate the provided conditional.
+ * @param conditional The conditional object.
+ * @return A boolean value indicating if the conditional holds.
+ * @throws AraraException Something wrong happened, to be caught in the
+ * higher levels.
+ */
+ public boolean evaluate(Conditional conditional) throws AraraException {
+
+ // when in dry-run mode, arara
+ // always ignore conditional evaluations
+ if (((Boolean) ConfigurationController.
+ getInstance().get("execution.dryrun")) == true) {
+ return false;
+ }
+
+ switch (conditional.getType()) {
+ case NONE:
+ return false;
+ case IF:
+ case UNLESS:
+ if (!halt) {
+ halt = true;
+ } else {
+ return false;
+ }
+ break;
+ }
+
+ // check counters and see if the execution
+ // has reached our concept of infinity,
+ // thus breaking the cycles
+ counter++;
+ if (((conditional.getType() == Conditional.ConditionalType.WHILE) &&
+ (counter > loops)) ||
+ ((conditional.getType() == Conditional.ConditionalType.UNTIL) &&
+ (counter >= loops))) {
+ return false;
+ } else {
+
+ Map<String, Object> context = new HashMap<String, Object>();
+ Methods.addConditionalMethods(context);
+
+ try {
+ Object result = TemplateRuntime.eval("@{ ".concat(
+ conditional.getCondition()).concat(" }"), context);
+ if (!CommonUtils.checkClass(Boolean.class, result)) {
+ throw new AraraException(
+ messages.getMessage(
+ Messages.ERROR_EVALUATE_NOT_BOOLEAN_VALUE
+ )
+ );
+ } else {
+ boolean value = (Boolean) result;
+ switch (conditional.getType()) {
+ case UNLESS:
+ case UNTIL:
+ value = !value;
+ break;
+ }
+ return value;
+ }
+ } catch (RuntimeException exception) {
+ throw new AraraException(
+ messages.getMessage(
+ Messages.ERROR_EVALUATE_COMPILATION_FAILED
+ ),
+ exception
+ );
+ }
+ }
+ }
+
+}