Refactoring: extract urls to separate class and remove long strings

.idea/dictionaries/Nikolay_Krasko.xml

@@ -10,6 +10,7 @@
       <w>infos</w>
       <w>intrinsics</w>
       <w>kdoc</w>
+      <w>lateinit</w>
       <w>memoize</w>
       <w>memoized</w>
       <w>multiline</w>
@@ -23,6 +24,7 @@
       <w>subclassed</w>
       <w>subgraph</w>
       <w>substep</w>
+      <w>tailrec</w>
     </words>
   </dictionary>
 </component>

idea/src/org/jetbrains/kotlin/idea/KotlinQuickDocumentationProvider.kt

@@ -31,6 +31,8 @@ import com.intellij.psi.PsiWhiteSpace
 import org.jetbrains.kotlin.asJava.LightClassUtil
 import org.jetbrains.kotlin.asJava.elements.KtLightDeclaration
 import org.jetbrains.kotlin.descriptors.*
+import org.jetbrains.kotlin.idea.DocumentationURLs.LATE_INITIALIZED_PROPERTIES_AND_VARIABLES_URL
+import org.jetbrains.kotlin.idea.DocumentationURLs.TAIL_RECURSIVE_FUNCTIONS_URL
 import org.jetbrains.kotlin.idea.caches.resolve.analyze
 import org.jetbrains.kotlin.idea.caches.resolve.getResolutionFacade
 import org.jetbrains.kotlin.idea.caches.resolve.resolveToDescriptorIfAny
@@ -63,6 +65,14 @@ import org.jetbrains.kotlin.resolve.lazy.BodyResolveMode
 import org.jetbrains.kotlin.utils.addToStdlib.constant
 import org.jetbrains.kotlin.utils.addToStdlib.safeAs
 
+private object DocumentationURLs {
+    const val LATE_INITIALIZED_PROPERTIES_AND_VARIABLES_URL =
+        "http://kotlinlang.org/docs/reference/properties.html#late-initialized-properties-and-variables"
+
+    const val TAIL_RECURSIVE_FUNCTIONS_URL =
+        "http://kotlinlang.org/docs/reference/functions.html#tail-recursive-functions"
+}
+
 class HtmlClassifierNamePolicy(val base: ClassifierNamePolicy) : ClassifierNamePolicy {
     override fun renderClassifier(classifier: ClassifierDescriptor, renderer: DescriptorRenderer): String {
         if (DescriptorUtils.isAnonymousObject(classifier)) {
@@ -281,8 +291,17 @@ class KotlinQuickDocumentationProvider : AbstractDocumentationProvider() {
                 return renderKotlinDeclaration(origin, quickNavigation)
             } else if (element.isModifier()) {
                 when(element.text) {
-                    KtTokens.LATEINIT_KEYWORD.value -> return """lateinit allows initializing a <a href="http://kotlinlang.org/docs/reference/properties.html#late-initialized-properties-and-variables">non-null property outside of a constructor</a>"""
-                    KtTokens.TAILREC_KEYWORD.value -> return """tailrec marks a function as <a href="http://kotlinlang.org/docs/reference/functions.html#tail-recursive-functions">tail-recursive</a> (allowing the compiler to replace recursion with iteration)"""
+                    KtTokens.LATEINIT_KEYWORD.value -> {
+                        return "lateinit allows initializing a ${a(
+                            LATE_INITIALIZED_PROPERTIES_AND_VARIABLES_URL,
+                            "non-null property outside of a constructor"
+                        )}"
+                    }
+
+                    KtTokens.TAILREC_KEYWORD.value -> {
+                        return "tailrec marks a function as ${a(TAIL_RECURSIVE_FUNCTIONS_URL, "tail-recursive")} " +
+                                "(allowing the compiler to replace recursion with iteration)"
+                    }
                 }
             }
 
@@ -383,7 +402,6 @@ class KotlinQuickDocumentationProvider : AbstractDocumentationProvider() {
             }
         }
 
-
         private fun StringBuilder.renderDefinition(descriptor: DeclarationDescriptor, renderer: DescriptorRenderer) {
             if (!DescriptorUtils.isLocal(descriptor)) {
                 val containingDeclaration = descriptor.containingDeclaration
@@ -469,6 +487,10 @@ class KotlinQuickDocumentationProvider : AbstractDocumentationProvider() {
             wrap("<$tag>", "</$tag>", body)
         }
 
+        private fun a(url: String, text: String): String {
+            return """<a href="$url">$text</a>"""
+        }
+
         private fun mixKotlinToJava(
             declarationDescriptor: DeclarationDescriptor,
             element: PsiElement,