completion in kdoc

compiler/frontend/src/org/jetbrains/kotlin/kdoc/psi/impl/KDocName.kt

@@ -30,10 +30,12 @@ import org.jetbrains.kotlin.psi.psiUtil.getChildOfType
 public class KDocName(node: ASTNode): JetElementImpl(node) {
     public fun getContainingDoc(): KDoc {
         val kdoc = getStrictParentOfType<KDoc>()
-        if (kdoc == null) {
-            throw IllegalStateException("KDocName must be inside a KDoc")
-        }
-        return kdoc
+        return kdoc ?: throw IllegalStateException("KDocName must be inside a KDoc")
+    }
+
+    public fun getContainingSection(): KDocSection {
+        val kdoc = getStrictParentOfType<KDocSection>()
+        return kdoc ?: throw IllegalStateException("KDocName must be inside a KDocSection")
     }
 
     public fun getQualifier(): KDocName? = getChildOfType()

generators/src/org/jetbrains/kotlin/generators/tests/GenerateTests.kt

@@ -678,6 +678,10 @@ fun main(args: Array<String>) {
         testClass(javaClass<AbstractKDocHighlightingTest>()) {
             model("kdoc/highlighting")
         }
+
+        testClass<AbstractJvmBasicCompletionTest>("org.jetbrains.kotlin.idea.kdoc.KDocCompletionTestGenerated") {
+            model("kdoc/completion")
+        }
     }
 
     testGroup("idea/tests", "compiler/testData") {
@@ -734,6 +738,13 @@ fun main(args: Array<String>) {
 }
 
 private class TestGroup(val testsRoot: String, val testDataRoot: String) {
+    inline fun <reified T: TestCase> testClass(
+            suiteTestClass: String = getDefaultSuiteTestClass(javaClass<T>()),
+            [noinline] init: TestClass.() -> Unit
+    ) {
+        testClass(javaClass<T>(), suiteTestClass, init)
+    }
+
     fun testClass(
             baseTestClass: Class<out TestCase>,
             suiteTestClass: String = getDefaultSuiteTestClass(baseTestClass),

idea/idea-analysis/src/org/jetbrains/kotlin/idea/kdoc/KDocReference.kt

@@ -46,6 +46,8 @@ import org.jetbrains.kotlin.resolve.source.PsiSourceElement
 import org.jetbrains.kotlin.psi.JetFile
 import org.jetbrains.kotlin.descriptors.DeclarationDescriptorWithSource
 import org.jetbrains.kotlin.kdoc.parser.KDocKnownTag
+import com.intellij.psi.PsiReference
+import org.jetbrains.kotlin.idea.caches.resolve.analyze
 
 public class KDocReference(element: KDocName): JetMultiReference<KDocName>(element) {
     override fun getTargetDescriptors(context: BindingContext): Collection<DeclarationDescriptor> {
@@ -92,27 +94,28 @@ public fun resolveKDocLink(session: KotlinCodeAnalyzer,
     return result
 }
 
-private fun resolveParamLink(fromDescriptor: DeclarationDescriptor, qualifiedName: List<String>): List<DeclarationDescriptor> {
+public fun getParamDescriptors(fromDescriptor: DeclarationDescriptor): List<DeclarationDescriptor> {
     // TODO resolve parameters of functions passed as parameters
-    val name = qualifiedName.singleOrNull() ?: return listOf()
     when (fromDescriptor) {
         is CallableDescriptor ->
-            return fromDescriptor.getValueParameters().filter { it.getName().asString() == name }
+            return fromDescriptor.getValueParameters()
         is ClassifierDescriptor -> {
-            val typeParams = fromDescriptor.getTypeConstructor().getParameters().filter { it.getName().asString() == name }
-            if (typeParams.isNotEmpty()) {
-                return typeParams
-            }
+            val typeParams = fromDescriptor.getTypeConstructor().getParameters()
             if (fromDescriptor is ClassDescriptor) {
-                return resolveParamLink(fromDescriptor.getUnsubstitutedPrimaryConstructor(), qualifiedName)
+                return typeParams + fromDescriptor.getUnsubstitutedPrimaryConstructor().getValueParameters()
             }
-            return listOf()
+            return typeParams
         }
     }
 
     return listOf()
 }
 
+private fun resolveParamLink(fromDescriptor: DeclarationDescriptor, qualifiedName: List<String>): List<DeclarationDescriptor> {
+    val name = qualifiedName.singleOrNull() ?: return listOf()
+    return getParamDescriptors(fromDescriptor).filter { it.getName().asString() == name }
+}
+
 private fun getPackageInnerScope(descriptor: PackageFragmentDescriptor): JetScope {
     val module = descriptor.getContainingDeclaration()
     val packageView = module.getPackage(descriptor.fqName)
@@ -136,7 +139,7 @@ private fun getClassInnerScope(outerScope: JetScope, descriptor: ClassDescriptor
     return classScope
 }
 
-private fun getResolutionScope(session: KotlinCodeAnalyzer, descriptor: DeclarationDescriptor): JetScope {
+public fun getResolutionScope(session: KotlinCodeAnalyzer, descriptor: DeclarationDescriptor): JetScope {
     return when (descriptor) {
         is PackageFragmentDescriptor ->
             getPackageInnerScope(descriptor)

idea/src/META-INF/plugin.xml

@@ -276,6 +276,8 @@
                             id="JetCompletionContributor"
                             order="first"
                             implementationClass="org.jetbrains.kotlin.idea.completion.KotlinCompletionContributor"/>
+    <completion.contributor language="jet"
+                            implementationClass="org.jetbrains.kotlin.idea.kdoc.KDocCompletionContributor"/>
 
     <completion.confidence language="jet" implementationClass="com.intellij.codeInsight.completion.UnfocusedNameIdentifier"/>
     <completion.confidence language="jet"

idea/src/org/jetbrains/kotlin/idea/completion/KotlinCompletionContributor.kt

@@ -192,6 +192,11 @@ public class KotlinCompletionContributor : CompletionContributor() {
         val position = parameters.getPosition()
         if (position.getContainingFile() !is JetFile) return
 
+        if (position.getNonStrictParentOfType<PsiComment>() != null) {
+            // don't stop here, allow other contributors to run
+            return
+        }
+
         if (shouldSuppressCompletion(parameters, result.getPrefixMatcher())) {
             result.stopHere()
             return
@@ -235,10 +240,6 @@ public class KotlinCompletionContributor : CompletionContributor() {
         val position = parameters.getPosition()
         val invocationCount = parameters.getInvocationCount()
 
-        // no completion in comments
-        // TODO: this must be changed if we will have references in doc-comments
-        if (position.getNonStrictParentOfType<PsiComment>() != null) return true
-
         // no completion inside number literals
         if (AFTER_NUMBER_LITERAL.accepts(position)) return true
 

idea/src/org/jetbrains/kotlin/idea/kdoc/KDocCompletionContributor.kt

@@ -0,0 +1,111 @@
+/*
+ * Copyright 2010-2015 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 org.jetbrains.kotlin.idea.kdoc
+
+import com.intellij.codeInsight.completion.CompletionContributor
+import com.intellij.codeInsight.completion.CompletionType
+import com.intellij.patterns.PlatformPatterns.psiElement
+import org.jetbrains.kotlin.kdoc.psi.impl.KDocName
+import com.intellij.codeInsight.completion.CompletionProvider
+import com.intellij.codeInsight.completion.CompletionParameters
+import com.intellij.util.ProcessingContext
+import com.intellij.codeInsight.completion.CompletionResultSet
+import org.jetbrains.kotlin.resolve.BindingContext
+import org.jetbrains.kotlin.kdoc.parser.KDocKnownTag
+import org.jetbrains.kotlin.idea.caches.resolve.analyze
+import org.jetbrains.kotlin.kdoc.psi.impl.KDocLink
+import org.jetbrains.kotlin.psi.psiUtil.getStrictParentOfType
+import org.jetbrains.kotlin.psi.psiUtil.getParentOfType
+import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
+import org.jetbrains.kotlin.idea.caches.resolve.KotlinCacheService
+import org.jetbrains.kotlin.resolve.lazy.KotlinCodeAnalyzer
+import org.jetbrains.kotlin.idea.completion.LookupElementFactory
+import org.jetbrains.kotlin.idea.caches.resolve.getResolutionFacade
+import com.intellij.codeInsight.lookup.LookupElementDecorator
+import com.intellij.codeInsight.lookup.LookupElement
+import com.intellij.codeInsight.completion.InsertionContext
+import org.jetbrains.kotlin.kdoc.lexer.KDocTokens
+import com.intellij.codeInsight.lookup.LookupElementBuilder
+import com.intellij.patterns.StandardPatterns
+
+class KDocCompletionContributor(): CompletionContributor() {
+    {
+        extend(CompletionType.BASIC, psiElement().inside(javaClass<KDocName>()),
+                KDocNameCompletionProvider)
+
+        extend(CompletionType.BASIC,
+               psiElement().afterLeaf(
+                   StandardPatterns.or(psiElement(KDocTokens.LEADING_ASTERISK), psiElement(KDocTokens.START))),
+               KDocTagCompletionProvider)
+    }
+}
+
+object KDocNameCompletionProvider: CompletionProvider<CompletionParameters>() {
+    override fun addCompletions(parameters: CompletionParameters, context: ProcessingContext, result: CompletionResultSet) {
+        val position = parameters.getPosition().getParentOfType<KDocName>(false) ?: return
+        val declaration = position.getContainingDoc().getOwner() ?: return
+        val bindingContext = declaration.analyze()
+        val kdocLink = position.getStrictParentOfType<KDocLink>()!!
+        val declarationDescriptor = bindingContext[BindingContext.DECLARATION_TO_DESCRIPTOR, declaration]
+        if (kdocLink.getTagIfSubject()?.knownTag == KDocKnownTag.PARAM) {
+            addParamCompletions(position, declarationDescriptor, result)
+        } else {
+            val session = KotlinCacheService.getInstance(parameters.getPosition().getProject()).getLazyResolveSession(position)
+            addLinkCompletions(session, position, declarationDescriptor, result)
+        }
+    }
+
+    private fun addParamCompletions(position: KDocName,
+                                    declarationDescriptor: DeclarationDescriptor,
+                                    result: CompletionResultSet) {
+        val section = position.getContainingSection()
+        val documentedParameters = section.findTagsByName("param").map { it.getSubjectName() }.toSet()
+        val descriptors = getParamDescriptors(declarationDescriptor)
+                .filter { it.getName().asString() !in documentedParameters }
+
+        val resolutionFacade = position.getResolutionFacade()
+        val factory = LookupElementFactory(listOf())
+        descriptors.forEach {
+            result.addElement(factory.createLookupElement(resolutionFacade, it, false))
+        }
+    }
+
+    private fun addLinkCompletions(session: KotlinCodeAnalyzer,
+                                   position: KDocName,
+                                   declarationDescriptor: DeclarationDescriptor,
+                                   result: CompletionResultSet) {
+        val scope = getResolutionScope(session, declarationDescriptor)
+        val resolutionFacade = position.getResolutionFacade()
+        val factory = LookupElementFactory(listOf())
+        scope.getAllDescriptors().forEach {
+            val element = factory.createLookupElement(resolutionFacade, it, false)
+            result.addElement(object: LookupElementDecorator<LookupElement>(element) {
+                override fun handleInsert(context: InsertionContext?) {
+                    // don't insert any qualified name here
+                }
+            })
+        }
+    }
+}
+
+object KDocTagCompletionProvider: CompletionProvider<CompletionParameters>() {
+    override fun addCompletions(parameters: CompletionParameters?, context: ProcessingContext, result: CompletionResultSet) {
+        KDocKnownTag.values().forEach {
+            result.addElement(LookupElementBuilder.create("@" + it.name().toLowerCase()))
+        }
+    }
+}

idea/testData/completion/basic/common/NoCompletionInDocComment.kt

@@ -1,7 +0,0 @@
-/**
- * <caret>
- */
-class C
-
-// INVOCATION_COUNT: 1
-// NUMBER: 0

idea/testData/kdoc/completion/Link.kt

@@ -0,0 +1,13 @@
+/**
+ * [<caret>]
+ */
+fun f(xyzzy: String) {
+
+}
+
+fun bar() {
+
+}
+
+// EXIST: xyzzy
+// EXIST: bar

idea/testData/kdoc/completion/ParamTag.kt

@@ -0,0 +1,8 @@
+/**
+ * @param <caret>
+ */
+fun foo(xyzzy: Int, foobar: String) {
+}
+
+// EXIST: xyzzy
+// EXIST: foobar

idea/testData/kdoc/completion/SkipExistingParamTag.kt

@@ -0,0 +1,9 @@
+/**
+ * @param xyzzy This is a xyzzy
+ * @param <caret>
+ */
+fun foo(xyzzy: Int, foobar: String) {
+}
+
+// ABSENT: xyzzy
+// EXIST: foobar

idea/testData/kdoc/completion/TagName.kt

@@ -0,0 +1,8 @@
+/**
+ * <caret>
+ */
+fun f(x: Int): Int {
+}
+
+// EXIST: @param
+// EXIST: @return

idea/testData/kdoc/completion/TagNameStart.kt

@@ -0,0 +1,6 @@
+/** <caret> */
+fun f(x: Int): Int {
+}
+
+// EXIST: @param
+// EXIST: @return

idea/tests/org/jetbrains/kotlin/completion/JSBasicCompletionTestGenerated.java

@@ -694,12 +694,6 @@ public class JSBasicCompletionTestGenerated extends AbstractJSBasicCompletionTes
             doTest(fileName);
         }
 
-        @TestMetadata("NoCompletionInDocComment.kt")
-        public void testNoCompletionInDocComment() throws Exception {
-            String fileName = JetTestUtils.navigationMetadata("idea/testData/completion/basic/common/NoCompletionInDocComment.kt");
-            doTest(fileName);
-        }
-
         @TestMetadata("NoEmptyPackage.kt")
         public void testNoEmptyPackage() throws Exception {
             String fileName = JetTestUtils.navigationMetadata("idea/testData/completion/basic/common/NoEmptyPackage.kt");

idea/tests/org/jetbrains/kotlin/completion/JvmBasicCompletionTestGenerated.java

@@ -694,12 +694,6 @@ public class JvmBasicCompletionTestGenerated extends AbstractJvmBasicCompletionT
             doTest(fileName);
         }
 
-        @TestMetadata("NoCompletionInDocComment.kt")
-        public void testNoCompletionInDocComment() throws Exception {
-            String fileName = JetTestUtils.navigationMetadata("idea/testData/completion/basic/common/NoCompletionInDocComment.kt");
-            doTest(fileName);
-        }
-
         @TestMetadata("NoEmptyPackage.kt")
         public void testNoEmptyPackage() throws Exception {
             String fileName = JetTestUtils.navigationMetadata("idea/testData/completion/basic/common/NoEmptyPackage.kt");

idea/tests/org/jetbrains/kotlin/idea/kdoc/KDocCompletionTestGenerated.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright 2010-2015 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 org.jetbrains.kotlin.idea.kdoc;
+
+import com.intellij.testFramework.TestDataPath;
+import org.jetbrains.kotlin.test.InnerTestClasses;
+import org.jetbrains.kotlin.test.JUnit3RunnerWithInners;
+import org.jetbrains.kotlin.test.JetTestUtils;
+import org.jetbrains.kotlin.completion.AbstractJvmBasicCompletionTest;
+import org.jetbrains.kotlin.test.TestMetadata;
+import org.junit.runner.RunWith;
+
+import java.io.File;
+import java.util.regex.Pattern;
+
+/** This class is generated by {@link org.jetbrains.kotlin.generators.tests.TestsPackage}. DO NOT MODIFY MANUALLY */
+@SuppressWarnings("all")
+@TestMetadata("idea/testData/kdoc/completion")
+@TestDataPath("$PROJECT_ROOT")
+@RunWith(JUnit3RunnerWithInners.class)
+public class KDocCompletionTestGenerated extends AbstractJvmBasicCompletionTest {
+    public void testAllFilesPresentInCompletion() throws Exception {
+        JetTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("idea/testData/kdoc/completion"), Pattern.compile("^(.+)\\.kt$"), true);
+    }
+
+    @TestMetadata("Link.kt")
+    public void testLink() throws Exception {
+        String fileName = JetTestUtils.navigationMetadata("idea/testData/kdoc/completion/Link.kt");
+        doTest(fileName);
+    }
+
+    @TestMetadata("ParamTag.kt")
+    public void testParamTag() throws Exception {
+        String fileName = JetTestUtils.navigationMetadata("idea/testData/kdoc/completion/ParamTag.kt");
+        doTest(fileName);
+    }
+
+    @TestMetadata("SkipExistingParamTag.kt")
+    public void testSkipExistingParamTag() throws Exception {
+        String fileName = JetTestUtils.navigationMetadata("idea/testData/kdoc/completion/SkipExistingParamTag.kt");
+        doTest(fileName);
+    }
+
+    @TestMetadata("TagName.kt")
+    public void testTagName() throws Exception {
+        String fileName = JetTestUtils.navigationMetadata("idea/testData/kdoc/completion/TagName.kt");
+        doTest(fileName);
+    }
+
+    @TestMetadata("TagNameStart.kt")
+    public void testTagNameStart() throws Exception {
+        String fileName = JetTestUtils.navigationMetadata("idea/testData/kdoc/completion/TagNameStart.kt");
+        doTest(fileName);
+    }
+}