Add gradle task to print spec tests statistic by spec sections

compiler/tests-spec/build.gradle.kts

@@ -17,3 +17,8 @@ projectTest {
 }
 
 val generateTests by generator("org.jetbrains.kotlin.generators.tests.GenerateCompilerSpecTestsKt")
+
+val printSpecTestsStatistic by smartJavaExec {
+    classpath = javaPluginConvention().sourceSets.getByName("test").runtimeClasspath
+    main = "org.jetbrains.kotlin.spec.tasks.PrintSpecTestsStatisticKt"
+}

compiler/tests-spec/tests/org/jetbrains/kotlin/spec/TestsStatisticCollector.kt

@@ -0,0 +1,83 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.spec
+
+import java.io.File
+
+abstract class SpecTestsStatElement {
+    var counter = 0
+    abstract val elements: MutableMap<*, out SpecTestsStatElement>?
+    open fun increment() {
+        counter++
+    }
+}
+
+class SpecTestsTypeStat(private val paragraph: SpecTestsStatElement) : SpecTestsStatElement() {
+    override val elements = null
+    override fun increment() {
+        super.increment()
+        paragraph.increment()
+    }
+}
+
+class SpecTestsParagraphStat(private val section: SpecTestsStatElement) : SpecTestsStatElement() {
+    override val elements = sortedMapOf<String, SpecTestsTypeStat>()
+    override fun increment() {
+        super.increment()
+        section.increment()
+    }
+}
+
+class SpecTestsSectionStat(private val area: SpecTestsStatElement) : SpecTestsStatElement() {
+    override val elements = sortedMapOf<Int, SpecTestsParagraphStat>()
+    override fun increment() {
+        super.increment()
+        area.increment()
+    }
+}
+
+class SpecTestsAreaStat : SpecTestsStatElement() {
+    override val elements = sortedMapOf<String, SpecTestsSectionStat>()
+}
+
+object TestsStatisticCollector {
+    private const val TEST_DATA_DIR = "./testData"
+
+    private fun incrementStatCounters(testAreaStats: SpecTestsAreaStat, sectionName: String, paragraphNumber: Int, testType: String) {
+        val section = testAreaStats.elements.computeIfAbsent(sectionName) { SpecTestsSectionStat(testAreaStats) }
+        val paragraph = section.elements.computeIfAbsent(paragraphNumber) { SpecTestsParagraphStat(section) }
+
+        paragraph.elements.computeIfAbsent(testType) { SpecTestsTypeStat(paragraph) }.increment()
+    }
+
+    fun collect(): Map<TestArea, SpecTestsAreaStat> {
+        val statistic = mutableMapOf<TestArea, SpecTestsAreaStat>()
+
+        for (specTestArea in TestArea.values()) {
+            val specTestsPath = "$TEST_DATA_DIR/${specTestArea.name.toLowerCase()}"
+
+            statistic[specTestArea] = SpecTestsAreaStat()
+
+            File(specTestsPath).walkTopDown().forEach areaTests@{
+                if (!it.isFile || it.extension != "kt") return@areaTests
+
+                val testInfoMatcher = SpecTestValidator.testPathPattern.matcher(it.path)
+
+                if (!testInfoMatcher.find()) return@areaTests
+
+                val sectionNumber = testInfoMatcher.group("sectionNumber")
+                val sectionName = testInfoMatcher.group("sectionName")
+                val paragraphNumber = testInfoMatcher.group("paragraphNumber").toInt()
+                val testType = testInfoMatcher.group("testType")
+                val section = "$sectionNumber $sectionName"
+
+                incrementStatCounters(statistic[specTestArea]!!, section, paragraphNumber, testType)
+            }
+        }
+
+        return statistic
+    }
+}

compiler/tests-spec/tests/org/jetbrains/kotlin/spec/tasks/PrintSpecTestsStatistic.kt

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.spec.tasks
+
+import org.jetbrains.kotlin.spec.TestsStatisticCollector
+
+fun main(args: Array<String>) {
+    val statistic = TestsStatisticCollector.collect()
+
+    println("--------------------------------------------------")
+    println("SPEC TESTS STATISTIC")
+    println("--------------------------------------------------")
+
+    for ((areaName, areaElement) in statistic) {
+        println("$areaName: ${areaElement.counter} tests")
+
+        for ((sectionName, sectionElement) in areaElement.elements) {
+            println("  ${sectionName.toUpperCase()}: ${sectionElement.counter} tests")
+
+            for ((paragraphName, paragraphElement) in sectionElement.elements) {
+                val testsStatByType = mutableListOf<String>()
+
+                for ((typeName, typeElement) in paragraphElement.elements) {
+                    testsStatByType.add("$typeName: ${typeElement.counter}")
+                }
+
+                println("    PARAGRAPH $paragraphName: ${paragraphElement.counter} tests (${testsStatByType.joinToString(", ")})")
+            }
+        }
+    }
+
+    println("--------------------------------------------------")
+}