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/**
* Arara, the cool TeX automation tool
* Copyright (c) 2012 -- 2019, 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
);
}
}
}
}
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