/*
 * Copyright 2000-2021 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.intellij.lang.annotations

import org.jetbrains.annotations.NonNls

/**
 * Specifies that an element of the program represents a string that must completely match given regular expression.
 * Code editors may use this annotation to report errors if the literals that assigned to the annotated variables,
 * passed as arguments to the annotated parameters, or returned from the annotated methods, do not match the supplied
 * pattern.
 *
 *
 * This annotation also could be used as a meta-annotation, to define other annotations for convenience.
 * E.g. the following annotation could be defined to annotate the strings that represent UUIDs:
 *
 * <pre>
 * &#64;Pattern("[\\dA-Fa-f]{8}-[\\dA-Fa-f]{4}-[\\dA-Fa-f]{4}-[\\dA-Fa-f]{4}-[\\dA-Fa-f]{12}")
 * &#64;interface UUID {}
</pre> *
 *
 *
 * Note that using the derived annotation as meta-annotation is not supported.
 * Meta-annotation works only one level deep.
 *
 * @see RegExp
 */
@MustBeDocumented
@Retention(AnnotationRetention.BINARY)
@Target(
    AnnotationTarget.FUNCTION,
    AnnotationTarget.PROPERTY_GETTER,
    AnnotationTarget.PROPERTY_SETTER,
    AnnotationTarget.FIELD,
    AnnotationTarget.VALUE_PARAMETER,
    AnnotationTarget.LOCAL_VARIABLE,
    AnnotationTarget.ANNOTATION_CLASS
)
actual annotation class Pattern(
    /**
     * A regular expression that matches all the valid string literals that assigned to the annotated variables,
     * passed as arguments to the annotated parameters, or returned from the annotated methods.
     */
    @get:Language("RegExp") @get:NonNls actual val value: String
)
