kotlin.reflect.jvm.internal.impl.load.java.utils.kt Maven / Gradle / Ivy

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/*
 * Copyright 2010-2017 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
 *
 * http://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 kotlin.reflect.jvm.internal.impl.load.java

import kotlin.reflect.jvm.internal.impl.builtins.KotlinBuiltIns
import kotlin.reflect.jvm.internal.impl.descriptors.ClassDescriptor
import kotlin.reflect.jvm.internal.impl.descriptors.ClassKind
import kotlin.reflect.jvm.internal.impl.incremental.components.NoLookupLocation
import kotlin.reflect.jvm.internal.impl.name.Name
import kotlin.reflect.jvm.internal.impl.types.KotlinType
import kotlin.reflect.jvm.internal.impl.types.typeUtil.makeNotNullable
import kotlin.reflect.jvm.internal.impl.utils.extractRadix

sealed class JavaDefaultValue
class EnumEntry(val descriptor: ClassDescriptor) : JavaDefaultValue()
class Constant(val value: Any) : JavaDefaultValue()

fun KotlinType.lexicalCastFrom(value: String): JavaDefaultValue? {
    val typeDescriptor = constructor.declarationDescriptor
    if (typeDescriptor is ClassDescriptor && typeDescriptor.kind == ClassKind.ENUM_CLASS) {
        val descriptor = typeDescriptor.unsubstitutedInnerClassesScope.getContributedClassifier(
                Name.identifier(value),
                NoLookupLocation.FROM_BACKEND
        )

        return if (descriptor is ClassDescriptor && descriptor.kind == ClassKind.ENUM_ENTRY) EnumEntry(descriptor) else null
    }

    val type = this.makeNotNullable()
    val (number, radix) = extractRadix(value)
    val result: Any? = try {
        when {
            KotlinBuiltIns.isBoolean(type) -> value.toBoolean()
            KotlinBuiltIns.isChar(type) -> value.singleOrNull()
            KotlinBuiltIns.isByte(type) -> number.toByteOrNull(radix)
            KotlinBuiltIns.isShort(type) -> number.toShortOrNull(radix)
            KotlinBuiltIns.isInt(type) -> number.toIntOrNull(radix)
            KotlinBuiltIns.isLong(type) -> number.toLongOrNull(radix)
            KotlinBuiltIns.isFloat(type) -> value.toFloatOrNull()
            KotlinBuiltIns.isDouble(type) -> value.toDoubleOrNull()
            KotlinBuiltIns.isString(type) -> value
            else -> null
        }
    } catch (e: IllegalArgumentException) {
        null
    }

    return if (result != null) Constant(result) else null
}