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feat(annotations): add
@CommandMethod annotation processing (#366)
We now verify the following at compile time: - That `@CommandMethod` annotated methods are non-static (error) - That `@CommandMethod` annotated methods are public (warning) - That the `@CommandMethod` syntax and specified `@Argument`s match - That no optional argument precedes a required argument
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67 changes: 67 additions & 0 deletions
67
...s/src/main/java/cloud/commandframework/annotations/processing/CommandMethodProcessor.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,67 @@ | ||
| // | ||
| // MIT License | ||
| // | ||
| // Copyright (c) 2021 Alexander Söderberg & Contributors | ||
| // | ||
| // 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 cloud.commandframework.annotations.processing; | ||
|
|
||
| import cloud.commandframework.annotations.CommandMethod; | ||
| import java.util.Set; | ||
| import javax.annotation.processing.AbstractProcessor; | ||
| import javax.annotation.processing.RoundEnvironment; | ||
| import javax.annotation.processing.SupportedAnnotationTypes; | ||
| import javax.lang.model.SourceVersion; | ||
| import javax.lang.model.element.Element; | ||
| import javax.lang.model.element.ElementKind; | ||
| import javax.lang.model.element.TypeElement; | ||
|
|
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| @SupportedAnnotationTypes(CommandMethod.ANNOTATION_PATH) | ||
| public final class CommandMethodProcessor extends AbstractProcessor { | ||
|
|
||
| @Override | ||
| public boolean process( | ||
| final Set<? extends TypeElement> annotations, | ||
| final RoundEnvironment roundEnv | ||
| ) { | ||
| final Set<? extends Element> elements = roundEnv.getElementsAnnotatedWith(CommandMethod.class); | ||
| if (elements.isEmpty()) { | ||
| return false; // Nothing to process... | ||
| } | ||
|
|
||
| for (final Element element : elements) { | ||
| if (element.getKind() != ElementKind.METHOD) { | ||
| // @CommandMethod can also be used on classes, but there's | ||
| // essentially nothing to process there... | ||
| continue; | ||
| } | ||
|
|
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| element.accept(new CommandMethodVisitor(this.processingEnv), null); | ||
| } | ||
|
|
||
| // https://errorprone.info/bugpattern/DoNotClaimAnnotations | ||
| return false; | ||
| } | ||
|
|
||
| @Override | ||
| public SourceVersion getSupportedSourceVersion() { | ||
| return SourceVersion.latest(); | ||
| } | ||
| } |
191 changes: 191 additions & 0 deletions
191
...ons/src/main/java/cloud/commandframework/annotations/processing/CommandMethodVisitor.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,191 @@ | ||
| // | ||
| // MIT License | ||
| // | ||
| // Copyright (c) 2021 Alexander Söderberg & Contributors | ||
| // | ||
| // 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 cloud.commandframework.annotations.processing; | ||
|
|
||
| import cloud.commandframework.annotations.Argument; | ||
| import cloud.commandframework.annotations.ArgumentMode; | ||
| import cloud.commandframework.annotations.CommandMethod; | ||
| import cloud.commandframework.annotations.SyntaxFragment; | ||
| import cloud.commandframework.annotations.SyntaxParser; | ||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
| import java.util.Objects; | ||
| import java.util.stream.Collectors; | ||
| import javax.annotation.processing.ProcessingEnvironment; | ||
| import javax.lang.model.element.Element; | ||
| import javax.lang.model.element.ElementVisitor; | ||
| import javax.lang.model.element.ExecutableElement; | ||
| import javax.lang.model.element.Modifier; | ||
| import javax.lang.model.element.PackageElement; | ||
| import javax.lang.model.element.TypeElement; | ||
| import javax.lang.model.element.TypeParameterElement; | ||
| import javax.lang.model.element.VariableElement; | ||
| import javax.tools.Diagnostic; | ||
| import org.checkerframework.checker.nullness.qual.NonNull; | ||
|
|
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| class CommandMethodVisitor implements ElementVisitor<Void, Void> { | ||
|
|
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| private final ProcessingEnvironment processingEnvironment; | ||
| private final SyntaxParser syntaxParser; | ||
|
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| CommandMethodVisitor(final @NonNull ProcessingEnvironment processingEnvironment) { | ||
| this.processingEnvironment = processingEnvironment; | ||
| this.syntaxParser = new SyntaxParser(); | ||
| } | ||
|
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| @Override | ||
| public Void visit(final Element e) { | ||
| return this.visit(e, null); | ||
| } | ||
|
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| @Override | ||
| public Void visit(final Element e, final Void unused) { | ||
| return null; | ||
| } | ||
|
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| @Override | ||
| public Void visitPackage(final PackageElement e, final Void unused) { | ||
| return null; | ||
| } | ||
|
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| @Override | ||
| public Void visitType(final TypeElement e, final Void unused) { | ||
| return null; | ||
| } | ||
|
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| @Override | ||
| public Void visitVariable(final VariableElement e, final Void unused) { | ||
| return null; | ||
| } | ||
|
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| @Override | ||
| public Void visitExecutable(final ExecutableElement e, final Void unused) { | ||
| if (!e.getModifiers().contains(Modifier.PUBLIC)) { | ||
| this.processingEnvironment.getMessager().printMessage( | ||
| Diagnostic.Kind.WARNING, | ||
| String.format( | ||
| "@CommandMethod annotated methods should be public (%s)", | ||
| e.getSimpleName() | ||
| ), | ||
| e | ||
| ); | ||
| } | ||
|
|
||
| if (e.getModifiers().contains(Modifier.STATIC)) { | ||
| this.processingEnvironment.getMessager().printMessage( | ||
| Diagnostic.Kind.ERROR, | ||
| String.format( | ||
| "@CommandMethod annotated methods should be non-static (%s)", | ||
| e.getSimpleName() | ||
| ), | ||
| e | ||
| ); | ||
| } | ||
|
|
||
| if (e.getReturnType().toString().equals("Void")) { | ||
| this.processingEnvironment.getMessager().printMessage( | ||
| Diagnostic.Kind.ERROR, | ||
| String.format( | ||
| "@CommandMethod annotated methods should return void (%s)", | ||
| e.getSimpleName() | ||
| ), | ||
| e | ||
| ); | ||
| } | ||
|
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| final CommandMethod commandMethod = e.getAnnotation(CommandMethod.class); | ||
| final List<String> parameterArgumentNames = e.getParameters() | ||
| .stream() | ||
| .map(parameter -> parameter.getAnnotation(Argument.class)) | ||
| .filter(Objects::nonNull) | ||
| .map(Argument::value) | ||
| .collect(Collectors.toList()); | ||
| final List<String> parsedArgumentNames = new ArrayList<>(parameterArgumentNames.size()); | ||
|
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| final List<SyntaxFragment> syntaxFragments = this.syntaxParser.apply(commandMethod.value()); | ||
|
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| boolean foundOptional = false; | ||
| for (final SyntaxFragment fragment : syntaxFragments) { | ||
| if (fragment.getArgumentMode() == ArgumentMode.LITERAL) { | ||
| continue; | ||
| } | ||
|
|
||
| if (!parameterArgumentNames.contains(fragment.getMajor())) { | ||
| this.processingEnvironment.getMessager().printMessage( | ||
| Diagnostic.Kind.ERROR, | ||
| String.format( | ||
| "@Argument(\"%s\") is missing from @CommandMethod (%s)", | ||
| fragment.getMajor(), | ||
| e.getSimpleName() | ||
| ), | ||
| e | ||
| ); | ||
| } | ||
|
|
||
| if (fragment.getArgumentMode() == ArgumentMode.REQUIRED) { | ||
| if (foundOptional) { | ||
| this.processingEnvironment.getMessager().printMessage( | ||
| Diagnostic.Kind.ERROR, | ||
| String.format( | ||
| "Required argument '%s' cannot succeed an optional argument (%s)", | ||
| fragment.getMajor(), | ||
| e.getSimpleName() | ||
| ), | ||
| e | ||
| ); | ||
| } | ||
| } else { | ||
| foundOptional = true; | ||
| } | ||
|
|
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| parsedArgumentNames.add(fragment.getMajor()); | ||
| } | ||
|
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| for (final String argument : parameterArgumentNames) { | ||
| if (!parsedArgumentNames.contains(argument)) { | ||
| this.processingEnvironment.getMessager().printMessage( | ||
| Diagnostic.Kind.ERROR, | ||
| String.format( | ||
| "Argument '%s' is missing from the @CommandMethod syntax (%s)", | ||
| argument, | ||
| e.getSimpleName() | ||
| ), | ||
| e | ||
| ); | ||
| } | ||
| } | ||
|
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| return null; | ||
| } | ||
|
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| @Override | ||
| public Void visitTypeParameter(final TypeParameterElement e, final Void unused) { | ||
| return null; | ||
| } | ||
|
|
||
| @Override | ||
| public Void visitUnknown(final Element e, final Void unused) { | ||
| return null; | ||
| } | ||
| } |
1 change: 1 addition & 0 deletions
1
cloud-annotations/src/main/resources/META-INF/services/javax.annotation.processing.Processor
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1 +1,2 @@ | ||
| cloud.commandframework.annotations.processing.CommandContainerProcessor | ||
| cloud.commandframework.annotations.processing.CommandMethodProcessor |
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