Add context receiver extensions for DSLs

lyngio/src/commonMain/kotlin/net/sergeych/lyng/io/html/LyngHtmlModule.kt

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
+ *
+ * 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 net.sergeych.lyng.io.html
+
+import net.sergeych.lyng.ModuleScope
+import net.sergeych.lyng.Scope
+import net.sergeych.lyng.Source
+import net.sergeych.lyng.pacman.ImportManager
+import net.sergeych.lyngio.stdlib_included.htmlLyng
+
+private const val HTML_MODULE_NAME = "lyng.io.html"
+
+fun createHtmlModule(scope: Scope): Boolean = createHtmlModule(scope.importManager)
+
+fun createHtml(scope: Scope): Boolean = createHtmlModule(scope)
+
+fun createHtmlModule(manager: ImportManager): Boolean {
+    if (manager.packageNames.contains(HTML_MODULE_NAME)) return false
+    manager.addPackage(HTML_MODULE_NAME) { module ->
+        buildHtmlModule(module)
+    }
+    return true
+}
+
+fun createHtml(manager: ImportManager): Boolean = createHtmlModule(manager)
+
+private suspend fun buildHtmlModule(module: ModuleScope) {
+    module.eval(Source(HTML_MODULE_NAME, htmlLyng))
+}

lyngio/src/commonTest/kotlin/net/sergeych/lyng/io/html/LyngHtmlModuleTest.kt

@@ -0,0 +1,57 @@
+/*
+ * Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
+ *
+ * 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 net.sergeych.lyng.io.html
+
+import kotlinx.coroutines.test.runTest
+import net.sergeych.lyng.Compiler
+import net.sergeych.lyng.Script
+import net.sergeych.lyng.Source
+import net.sergeych.lyng.pacman.ImportManager
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertFalse
+import kotlin.test.assertTrue
+
+class LyngHtmlModuleTest {
+
+    @Test
+    fun testModuleRegistrationIsIdempotent() = runTest {
+        val importManager = ImportManager()
+        assertTrue(createHtmlModule(importManager))
+        assertFalse(createHtmlModule(importManager))
+    }
+
+    @Test
+    fun testModuleCanBeImported() = runTest {
+        val scope = Script.newScope()
+        createHtmlModule(scope.importManager)
+
+        val result = Compiler.compile(
+            Source(
+                "<html-test>",
+                """
+                import lyng.io.html
+                42
+                """.trimIndent()
+            ),
+            scope.importManager
+        ).execute(scope)
+
+        assertEquals("42", result.inspect(scope))
+    }
+}