Refactor deprecation by version requirement

- Get rid of ApiVersion in favor of MavenComparableVersion
- Don't crash on invalid versions in RequireKotlin
- Extract to a separate function

compiler/frontend/src/org/jetbrains/kotlin/resolve/deprecationUtil.kt

@@ -18,9 +18,9 @@ package org.jetbrains.kotlin.resolve
 
 import com.intellij.psi.PsiElement
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
-import org.jetbrains.kotlin.config.ApiVersion
 import org.jetbrains.kotlin.config.KotlinCompilerVersion
 import org.jetbrains.kotlin.config.LanguageVersionSettings
+import org.jetbrains.kotlin.config.MavenComparableVersion
 import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.descriptors.annotations.AnnotationDescriptor
 import org.jetbrains.kotlin.descriptors.annotations.AnnotationUseSiteTarget
@@ -287,26 +287,7 @@ class DeprecationResolver(
                 result.add(deprecation)
             }
 
-            val versionRequirement =
+            getDeprecationByVersionRequirement(target)?.let(result::add)
-                (target as? DeserializedMemberDescriptor)?.versionRequirement
-                        ?: (target as? DeserializedClassDescriptor)?.versionRequirement
-            if (versionRequirement != null) {
-                // We're using ApiVersion because it's convenient to compare versions, "-api-version" is not involved in any way
-                // TODO: usage of ApiVersion is confusing here, refactor
-                val requiredVersion = ApiVersion.createByVersionRequirement(versionRequirement)
-                val currentVersion = when (versionRequirement.kind) {
-                    ProtoBuf.VersionRequirement.VersionKind.LANGUAGE_VERSION ->
-                        ApiVersion.createByLanguageVersion(languageVersionSettings.languageVersion)
-                    ProtoBuf.VersionRequirement.VersionKind.API_VERSION ->
-                        languageVersionSettings.apiVersion
-                    ProtoBuf.VersionRequirement.VersionKind.COMPILER_VERSION ->
-                        KotlinCompilerVersion.getVersion()?.let((ApiVersion)::parse)
-                    else -> null
-                }
-                if (currentVersion != null && currentVersion < requiredVersion) {
-                    result.add(DeprecatedByVersionRequirement(versionRequirement, target))
-                }
-            }
         }
 
         fun addUseSiteTargetedDeprecationIfPresent(annotatedDescriptor: DeclarationDescriptor, useSiteTarget: AnnotationUseSiteTarget?) {
@@ -345,4 +326,32 @@ class DeprecationResolver(
 
         return result.distinct()
     }
+
+    private fun getDeprecationByVersionRequirement(target: DeclarationDescriptor): DeprecatedByVersionRequirement? {
+        fun createVersion(version: String): MavenComparableVersion? = try {
+            MavenComparableVersion(version)
+        } catch (e: Exception) {
+            null
+        }
+
+        val versionRequirement =
+            (target as? DeserializedMemberDescriptor)?.versionRequirement
+                    ?: (target as? DeserializedClassDescriptor)?.versionRequirement
+        if (versionRequirement != null) {
+            val requiredVersion = createVersion(versionRequirement.version.asString())
+            val currentVersion = when (versionRequirement.kind) {
+                ProtoBuf.VersionRequirement.VersionKind.LANGUAGE_VERSION ->
+                    MavenComparableVersion(languageVersionSettings.languageVersion.versionString)
+                ProtoBuf.VersionRequirement.VersionKind.API_VERSION ->
+                    languageVersionSettings.apiVersion.version
+                ProtoBuf.VersionRequirement.VersionKind.COMPILER_VERSION ->
+                    KotlinCompilerVersion.getVersion()?.let(::createVersion)
+                else -> null
+            }
+            if (currentVersion != null && currentVersion < requiredVersion) {
+                return DeprecatedByVersionRequirement(versionRequirement, target)
+            }
+        }
+        return null
+    }
 }

compiler/util/src/org/jetbrains/kotlin/config/ApiVersion.kt

@@ -16,7 +16,6 @@
 
 package org.jetbrains.kotlin.config
 
-import org.jetbrains.kotlin.serialization.deserialization.descriptors.VersionRequirement
 import org.jetbrains.kotlin.utils.DescriptionAware
 
 class ApiVersion private constructor(
@@ -59,10 +58,6 @@ class ApiVersion private constructor(
         @JvmStatic
         fun createByLanguageVersion(version: LanguageVersion): ApiVersion = parse(version.versionString)!!
 
-        @JvmStatic
-        fun createByVersionRequirement(versionRequirement: VersionRequirement): ApiVersion =
-                versionRequirement.version.let { version -> parse(version.asString()) ?: error("Could not parse version: $version") }
-
         fun parse(versionString: String): ApiVersion? = try {
             ApiVersion(MavenComparableVersion(versionString), versionString)
         }