feat: cache completion values

Author: xepozz

src/main/kotlin/com/github/tempest/framework/router/completion/RouteParameterCompletionContributor.kt

@@ -51,7 +51,7 @@ class RouteParameterCompletionContributor : CompletionContributor() {
                     if (firstParameter == element) return
 
                     RouteResolveUtils
-                        .resolve(firstParameter)
+                        .resolveCached(firstParameter)
                         .flatMap { RouteLookupElementBuilder.create(it) }
                         .apply { result.addAllElements(this) }
                         .apply { if (isNotEmpty()) result.stopHere() }

src/main/kotlin/com/github/tempest/framework/router/references/RouteParameterReference.kt

@@ -16,15 +16,15 @@ class RouteParameterReference(
     override fun resolve(): PsiElement? {
         val phpIndex = PhpIndex.getInstance(routeReferenceElement.project)
         return RouteResolveUtils
-            .resolve(routeReferenceElement)
+            .resolveCached(routeReferenceElement)
             .firstOrNull()
             ?.let { phpIndex.getMethodsByFQN(it.action) }
             ?.firstOrNull()
             ?.getParameter(parameterName)
     }
 
     override fun getVariants() = RouteResolveUtils
-        .resolve(routeReferenceElement)
+        .resolveCached(routeReferenceElement)
         .flatMap { RouteLookupElementBuilder.create(it) }
         .toTypedArray()
 

src/main/kotlin/com/github/tempest/framework/router/references/RouteResolveUtils.kt

@@ -4,12 +4,22 @@ import com.github.tempest.framework.TempestFrameworkClasses
 import com.github.tempest.framework.router.index.Route
 import com.github.tempest.framework.router.index.RouterIndexUtils
 import com.intellij.psi.PsiElement
+import com.intellij.psi.util.CachedValueProvider
+import com.intellij.psi.util.CachedValuesManager
 import com.jetbrains.php.lang.PhpReferenceContributor
 import com.jetbrains.php.lang.psi.elements.ArrayCreationExpression
 import com.jetbrains.php.lang.psi.elements.Method
 import com.jetbrains.php.lang.psi.elements.StringLiteralExpression
 
 object RouteResolveUtils {
+    fun resolveCached(firstParameter: PsiElement): Collection<Route> =
+        CachedValuesManager.getCachedValue(firstParameter) {
+            CachedValueProvider.Result.create(
+                resolve(firstParameter),
+                firstParameter.containingFile,
+            )
+        }
+
     fun resolve(firstParameter: PsiElement): Collection<Route> =
         when (firstParameter) {
             is ArrayCreationExpression -> fromArrayCreation(firstParameter)