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/*
* Copyright (c) 2021, 2022, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package compiler.lib.ir_framework.shared;
import java.util.function.BiPredicate;
import java.util.function.Function;
/**
* Utility class to parse a comparator either in the applyIf* or in the counts properties of an @IR rules.
*/
public class ComparisonConstraintParser {
private enum Comparator {
ONE_CHAR, TWO_CHARS
}
public static <T extends Comparable<T>> Comparison<T> parse(String constraint, Function<String, T> parseFunction) {
try {
return parseConstraintAndValue(constraint, parseFunction);
} catch (EmptyConstraintException e) {
throw new TestFormatException("Provided empty value");
} catch (MissingConstraintValueException e) {
throw new TestFormatException("Provided empty value after comparator \"" + e.getComparator() + "\"");
} catch (InvalidComparatorException e) {
throw new TestFormatException("Provided invalid comparator \"" + e.getComparator() + "\"");
} catch (InvalidConstraintValueException e) {
String comparator = e.getComparator();
if (!comparator.isEmpty()) {
comparator = " after comparator \"" + comparator + "\"";
}
throw new TestFormatException("Provided invalid value \"" + e.getInvalidValue() + "\"" + comparator);
}
}
private static <T extends Comparable<T>> Comparison<T> parseConstraintAndValue(String constraint,
Function<String, T> parseFunction) throws
EmptyConstraintException, MissingConstraintValueException,
InvalidComparatorException, InvalidConstraintValueException {
ParsedResult<T> result = parse(constraint);
T givenValue = parseGivenValue(parseFunction, result);
return new Comparison<>(givenValue, result.comparator, result.comparisonPredicate);
}
private static <T extends Comparable<T>> ParsedResult<T> parse(String constraint) throws
EmptyConstraintException, MissingConstraintValueException, InvalidComparatorException {
constraint = constraint.trim();
if (constraint.isEmpty()) {
throw new EmptyConstraintException();
}
switch (constraint.charAt(0)) {
case '<' -> {
throwIfNoValueAfterComparator(constraint, Comparator.ONE_CHAR);
if (constraint.charAt(1) == '=') {
throwIfNoValueAfterComparator(constraint, Comparator.TWO_CHARS);
return new ParsedResult<>(constraint.substring(2).trim(), "<=", (x, y) -> x.compareTo(y) <= 0);
} else {
return new ParsedResult<>(constraint.substring(1).trim(), "<", (x, y) -> x.compareTo(y) < 0);
}
}
case '>' -> {
throwIfNoValueAfterComparator(constraint, Comparator.ONE_CHAR);
if (constraint.charAt(1) == '=') {
throwIfNoValueAfterComparator(constraint, Comparator.TWO_CHARS);
return new ParsedResult<>(constraint.substring(2).trim(), ">=", (x, y) -> x.compareTo(y) >= 0);
} else {
return new ParsedResult<>(constraint.substring(1).trim(), ">", (x, y) -> x.compareTo(y) > 0);
}
}
case '!' -> {
throwIfNoValueAfterComparator(constraint, Comparator.ONE_CHAR);
if (constraint.charAt(1) != '=') {
throw new InvalidComparatorException("!");
}
throwIfNoValueAfterComparator(constraint, Comparator.TWO_CHARS);
return new ParsedResult<>(constraint.substring(2).trim(), "!=", (x, y) -> x.compareTo(y) != 0);
}
case '=' -> { // Allowed syntax, equivalent to not using any symbol.
throwIfNoValueAfterComparator(constraint, Comparator.ONE_CHAR);
return new ParsedResult<>(constraint.substring(1).trim(), "=", (x, y) -> x.compareTo(y) == 0);
}
default -> {
return new ParsedResult<>(constraint.trim(), "=", (x, y) -> x.compareTo(y) == 0);
}
}
}
private static void throwIfNoValueAfterComparator(String constraint, Comparator comparator) throws MissingConstraintValueException {
switch (comparator) {
case ONE_CHAR -> {
if (constraint.length() == 1) {
throw new MissingConstraintValueException(constraint);
}
}
case TWO_CHARS -> {
if (constraint.length() == 2) {
throw new MissingConstraintValueException(constraint);
}
}
}
}
private static <T extends Comparable<T>> T parseGivenValue(Function<String, T> parseFunction, ParsedResult<T> result)
throws InvalidConstraintValueException {
try {
return parseFunction.apply(result.value);
}
catch (NumberFormatException e) {
throw new InvalidConstraintValueException(result.value, result.comparator);
}
}
static class ParsedResult<T> {
public String value;
public BiPredicate<T, T> comparisonPredicate;
public String comparator;
public ParsedResult(String value, String comparator,BiPredicate<T, T> comparisonPredicate) {
this.value = value;
this.comparator = comparator;
this.comparisonPredicate = comparisonPredicate;
}
}
}
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