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"nb-javac" is a patched version of OpenJDK "javac", i.e., the Java compiler. This has long been part of NetBeans, providing a highly tuned Java compiler specifically for the Java editor i.e., parsing and lexing for features such as syntax coloring, code completion.
/*
* Copyright (c) 2002, 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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 com.sun.tools.javac.code;
import java.util.*;
import javax.lang.model.SourceVersion;
import static javax.lang.model.SourceVersion.*;
import com.sun.tools.javac.jvm.Target;
import com.sun.tools.javac.resources.CompilerProperties.Errors;
import com.sun.tools.javac.resources.CompilerProperties.Fragments;
import com.sun.tools.javac.util.*;
import com.sun.tools.javac.util.JCDiagnostic.Error;
import com.sun.tools.javac.util.JCDiagnostic.Fragment;
import static com.sun.tools.javac.main.Option.*;
/** The source language version accepted.
*
*
This is NOT part of any supported API.
* If you write code that depends on this, you do so at your own risk.
* This code and its internal interfaces are subject to change or
* deletion without notice.
*/
public enum Source {
/** 1.0 had no inner classes, and so could not pass the JCK. */
// public static final Source JDK1_0 = new Source("1.0");
/** 1.1 did not have strictfp, and so could not pass the JCK. */
// public static final Source JDK1_1 = new Source("1.1");
/** 1.2 introduced strictfp. */
JDK1_2("1.2"),
/** 1.3 is the same language as 1.2. */
JDK1_3("1.3"),
/** 1.4 introduced assert. */
JDK1_4("1.4"),
/** 1.5 introduced generics, attributes, foreach, boxing, static import,
* covariant return, enums, varargs, et al. */
JDK5("5"),
/** 1.6 reports encoding problems as errors instead of warnings. */
JDK6("6"),
/** 1.7 introduced try-with-resources, multi-catch, string switch, etc. */
JDK7("7"),
/** 1.8 lambda expressions and default methods. */
JDK8("8"),
/** 1.9 modularity. */
JDK9("9"),
/** 1.10 local-variable type inference (var). */
JDK10("10"),
/** 1.11 local-variable syntax for lambda parameters */
JDK11("11"),
/** 12, no language features; switch expression in preview */
JDK12("12"),
/**
* 13, no language features; text blocks and revised switch
* expressions in preview
*/
JDK13("13"),
/**
* 14, switch expressions; pattern matching, records, and revised
* text blocks in preview
*/
JDK14("14"),
/**
* 15, text blocks
*/
JDK15("15"),
/**
* 16, tbd
*/
JDK16("16"),
/**
* 17, tbd
*/
JDK17("17"),
/**
* 18, tbd
*/
JDK18("18"),
/**
* 19, tbd
*/
JDK19("19");
private static final Context.Key sourceKey = new Context.Key<>();
public static Source instance(Context context) {
Source instance = context.get(sourceKey);
if (instance == null) {
Options options = Options.instance(context);
String sourceString = options.get(SOURCE);
if (sourceString != null) instance = lookup(sourceString);
if (instance == null) instance = DEFAULT;
context.put(sourceKey, instance);
}
return instance;
}
public final String name;
private static final Map tab = new HashMap<>();
static {
for (Source s : values()) {
tab.put(s.name, s);
}
tab.put("1.5", JDK5); // Make 5 an alias for 1.5
tab.put("1.6", JDK6); // Make 6 an alias for 1.6
tab.put("1.7", JDK7); // Make 7 an alias for 1.7
tab.put("1.8", JDK8); // Make 8 an alias for 1.8
tab.put("1.9", JDK9); // Make 9 an alias for 1.9
tab.put("1.10", JDK10); // Make 10 an alias for 1.10
// Decline to make 1.11 an alias for 11.
}
private Source(String name) {
this.name = name;
}
public static final Source MIN = Source.JDK7;
private static final Source MAX = values()[values().length - 1];
public static final Source DEFAULT = MAX;
public static Source lookup(String name) {
return tab.get(name);
}
public boolean isSupported() {
return this.compareTo(MIN) >= 0;
}
public Target requiredTarget() {
return switch(this) {
case JDK19 -> Target.JDK1_19;
case JDK18 -> Target.JDK1_18;
case JDK17 -> Target.JDK1_17;
case JDK16 -> Target.JDK1_16;
case JDK15 -> Target.JDK1_15;
case JDK14 -> Target.JDK1_14;
case JDK13 -> Target.JDK1_13;
case JDK12 -> Target.JDK1_12;
case JDK11 -> Target.JDK1_11;
case JDK10 -> Target.JDK1_10;
case JDK9 -> Target.JDK1_9;
case JDK8 -> Target.JDK1_8;
case JDK7 -> Target.JDK1_7;
case JDK6 -> Target.JDK1_6;
case JDK5 -> Target.JDK1_5;
case JDK1_4 -> Target.JDK1_4;
default -> Target.JDK1_1;
};
}
/**
* Models a feature of the Java programming language. Each feature can be associated with a
* minimum source level, a maximum source level and a diagnostic fragment describing the feature,
* which is used to generate error messages of the kind {@code feature XYZ not supported in source N}.
*/
public enum Feature {
DIAMOND(JDK7, Fragments.FeatureDiamond, DiagKind.NORMAL),
MODULES(JDK9, Fragments.FeatureModules, DiagKind.PLURAL),
EFFECTIVELY_FINAL_VARIABLES_IN_TRY_WITH_RESOURCES(JDK9, Fragments.FeatureVarInTryWithResources, DiagKind.PLURAL),
DEPRECATION_ON_IMPORT(MIN, JDK8),
POLY(JDK8),
LAMBDA(JDK8, Fragments.FeatureLambda, DiagKind.PLURAL),
METHOD_REFERENCES(JDK8, Fragments.FeatureMethodReferences, DiagKind.PLURAL),
DEFAULT_METHODS(JDK8, Fragments.FeatureDefaultMethods, DiagKind.PLURAL),
STATIC_INTERFACE_METHODS(JDK8, Fragments.FeatureStaticIntfMethods, DiagKind.PLURAL),
STATIC_INTERFACE_METHODS_INVOKE(JDK8, Fragments.FeatureStaticIntfMethodInvoke, DiagKind.PLURAL),
STRICT_METHOD_CLASH_CHECK(JDK8),
EFFECTIVELY_FINAL_IN_INNER_CLASSES(JDK8),
TYPE_ANNOTATIONS(JDK8, Fragments.FeatureTypeAnnotations, DiagKind.PLURAL),
ANNOTATIONS_AFTER_TYPE_PARAMS(JDK8, Fragments.FeatureAnnotationsAfterTypeParams, DiagKind.PLURAL),
REPEATED_ANNOTATIONS(JDK8, Fragments.FeatureRepeatableAnnotations, DiagKind.PLURAL),
INTERSECTION_TYPES_IN_CAST(JDK8, Fragments.FeatureIntersectionTypesInCast, DiagKind.PLURAL),
GRAPH_INFERENCE(JDK8),
FUNCTIONAL_INTERFACE_MOST_SPECIFIC(JDK8),
POST_APPLICABILITY_VARARGS_ACCESS_CHECK(JDK8),
MAP_CAPTURES_TO_BOUNDS(MIN, JDK7),
PRIVATE_SAFE_VARARGS(JDK9),
DIAMOND_WITH_ANONYMOUS_CLASS_CREATION(JDK9, Fragments.FeatureDiamondAndAnonClass, DiagKind.NORMAL),
UNDERSCORE_IDENTIFIER(MIN, JDK8),
PRIVATE_INTERFACE_METHODS(JDK9, Fragments.FeaturePrivateIntfMethods, DiagKind.PLURAL),
LOCAL_VARIABLE_TYPE_INFERENCE(JDK10),
VAR_SYNTAX_IMPLICIT_LAMBDAS(JDK11, Fragments.FeatureVarSyntaxInImplicitLambda, DiagKind.PLURAL),
IMPORT_ON_DEMAND_OBSERVABLE_PACKAGES(JDK1_2, JDK8),
SWITCH_MULTIPLE_CASE_LABELS(JDK14, Fragments.FeatureMultipleCaseLabels, DiagKind.PLURAL),
SWITCH_RULE(JDK14, Fragments.FeatureSwitchRules, DiagKind.PLURAL),
SWITCH_EXPRESSION(JDK14, Fragments.FeatureSwitchExpressions, DiagKind.PLURAL),
TEXT_BLOCKS(JDK15, Fragments.FeatureTextBlocks, DiagKind.PLURAL),
PATTERN_MATCHING_IN_INSTANCEOF(JDK16, Fragments.FeaturePatternMatchingInstanceof, DiagKind.NORMAL),
REIFIABLE_TYPES_INSTANCEOF(JDK16, Fragments.FeatureReifiableTypesInstanceof, DiagKind.PLURAL),
RECORDS(JDK16, Fragments.FeatureRecords, DiagKind.PLURAL),
SEALED_CLASSES(JDK17, Fragments.FeatureSealedClasses, DiagKind.PLURAL),
CASE_NULL(JDK17, Fragments.FeatureCaseNull, DiagKind.NORMAL),
PATTERN_SWITCH(JDK17, Fragments.FeaturePatternSwitch, DiagKind.PLURAL),
REDUNDANT_STRICTFP(JDK17),
UNCONDITIONAL_PATTERN_IN_INSTANCEOF(JDK19, Fragments.FeatureUnconditionalPatternsInInstanceof, DiagKind.PLURAL),
RECORD_PATTERNS(JDK19, Fragments.FeatureDeconstructionPatterns, DiagKind.PLURAL),
;
enum DiagKind {
NORMAL,
PLURAL;
}
private final Source minLevel;
private final Source maxLevel;
private final Fragment optFragment;
private final DiagKind optKind;
Feature(Source minLevel) {
this(minLevel, null, null);
}
Feature(Source minLevel, Fragment optFragment, DiagKind optKind) {
this(minLevel, MAX, optFragment, optKind);
}
Feature(Source minLevel, Source maxLevel) {
this(minLevel, maxLevel, null, null);
}
Feature(Source minLevel, Source maxLevel, Fragment optFragment, DiagKind optKind) {
this.minLevel = minLevel;
this.maxLevel = maxLevel;
this.optFragment = optFragment;
this.optKind = optKind;
}
public boolean allowedInSource(Source source) {
return source.compareTo(minLevel) >= 0 &&
source.compareTo(maxLevel) <= 0;
}
public boolean isPlural() {
Assert.checkNonNull(optKind);
return optKind == DiagKind.PLURAL;
}
public Fragment nameFragment() {
Assert.checkNonNull(optFragment);
return optFragment;
}
public Fragment fragment(String sourceName) {
Assert.checkNonNull(optFragment);
return optKind == DiagKind.NORMAL ?
Fragments.FeatureNotSupportedInSource(optFragment, sourceName, minLevel.name) :
Fragments.FeatureNotSupportedInSourcePlural(optFragment, sourceName, minLevel.name);
}
public Error error(String sourceName) {
Assert.checkNonNull(optFragment);
return optKind == DiagKind.NORMAL ?
Errors.FeatureNotSupportedInSource(optFragment, sourceName, minLevel.name) :
Errors.FeatureNotSupportedInSourcePlural(optFragment, sourceName, minLevel.name);
}
}
public static SourceVersion toSourceVersion(Source source) {
return switch(source) {
case JDK1_2 -> RELEASE_2;
case JDK1_3 -> RELEASE_3;
case JDK1_4 -> RELEASE_4;
case JDK5 -> RELEASE_5;
case JDK6 -> RELEASE_6;
case JDK7 -> RELEASE_7;
case JDK8 -> RELEASE_8;
case JDK9 -> RELEASE_9;
case JDK10 -> RELEASE_10;
case JDK11 -> RELEASE_11;
case JDK12 -> RELEASE_12;
case JDK13 -> RELEASE_13;
case JDK14 -> RELEASE_14;
case JDK15 -> RELEASE_15;
case JDK16 -> RELEASE_16;
case JDK17 -> RELEASE_17;
case JDK18 -> RELEASE_18;
case JDK19 -> RELEASE_19;
default -> null;
};
}
}
