Added script editor widget.

core/src/commonMain/kotlin/world/phantasmal/core/PrimitiveExtensions.kt

@@ -1,3 +1,5 @@
 package world.phantasmal.core
 
 fun Char.isDigit(): Boolean = this in '0'..'9'
+
+expect fun Int.reinterpretAsFloat(): Float

core/src/jsMain/kotlin/world/phantasmal/core/PrimitiveExtensions.kt

@@ -0,0 +1,11 @@
+package world.phantasmal.core
+
+import org.khronos.webgl.ArrayBuffer
+import org.khronos.webgl.DataView
+
+private val dataView = DataView(ArrayBuffer(4))
+
+actual fun Int.reinterpretAsFloat(): Float {
+    dataView.setInt32(0, this)
+    return dataView.getFloat32(0)
+}

core/src/jvmMain/kotlin/world/phantasmal/core/PrimitiveExtensions.kt

@@ -0,0 +1,5 @@
+package world.phantasmal.core
+
+import java.lang.Float.intBitsToFloat
+
+actual fun Int.reinterpretAsFloat(): Float = intBitsToFloat(this)

lib/src/commonMain/kotlin/world/phantasmal/lib/assembly/Assembly.kt

@@ -20,11 +20,15 @@ class AssemblyProblem(
 
 fun assemble(
     assembly: List<String>,
-    manualStack: Boolean = false,
+    inlineStackArgs: Boolean = true,
 ): PwResult<List<Segment>> {
-    logger.trace { "Assembly start." }
+    logger.trace {
+        "Assembling ${assembly.size} lines with ${
+            if (inlineStackArgs) "inline stack arguments" else "stack push instructions"
+        }."
+    }
 
-    val result = Assembler(assembly, manualStack).assemble()
+    val result = Assembler(assembly, inlineStackArgs).assemble()
 
     logger.trace {
         val warnings = result.problems.count { it.severity == Severity.Warning }
@@ -36,7 +40,7 @@ fun assemble(
     return result
 }
 
-private class Assembler(private val assembly: List<String>, private val manualStack: Boolean) {
+private class Assembler(private val assembly: List<String>, private val inlineStackArgs: Boolean) {
     private var lineNo = 1
     private lateinit var tokens: MutableList<Token>
     private var ir: MutableList<Segment> = mutableListOf()
@@ -355,7 +359,7 @@ private class Assembler(private val assembly: List<String>, private val manualSt
             }
 
             val paramCount =
-                if (manualStack && opcode.stack == StackInteraction.Pop) 0
+                if (!inlineStackArgs && opcode.stack == StackInteraction.Pop) 0
                 else opcode.params.size
 
             val argCount = tokens.count { it !is ArgSeparatorToken }

lib/src/commonMain/kotlin/world/phantasmal/lib/assembly/Disassembly.kt

@@ -0,0 +1,310 @@
+package world.phantasmal.lib.assembly
+
+import mu.KotlinLogging
+import world.phantasmal.core.reinterpretAsFloat
+import kotlin.math.min
+
+private val logger = KotlinLogging.logger {}
+
+private const val INDENT_WIDTH = 4
+private val INDENT = " ".repeat(INDENT_WIDTH)
+
+/**
+ * @param inlineStackArgs If true, will output stack arguments inline instead of outputting stack
+ * management instructions (argpush variants).
+ */
+fun disassemble(byteCodeIr: List<Segment>, inlineStackArgs: Boolean = true): List<String> {
+    logger.trace {
+        "Disassembling ${byteCodeIr.size} segments with ${
+            if (inlineStackArgs) "inline stack arguments" else "stack push instructions"
+        }."
+    }
+
+    val lines = mutableListOf<String>()
+    val stack = mutableListOf<ArgWithType>()
+    var sectionType: SegmentType? = null
+
+    for (segment in byteCodeIr) {
+        // Section marker (.code, .data or .string).
+        if (sectionType != segment.type) {
+            sectionType = segment.type
+
+            if (lines.isNotEmpty()) {
+                lines.add("")
+            }
+
+            val sectionMarker = when (segment) {
+                is InstructionSegment -> ".code"
+                is DataSegment -> ".data"
+                is StringSegment -> ".string"
+            }
+
+            lines.add(sectionMarker)
+            lines.add("")
+        }
+
+        // Labels.
+        for (label in segment.labels) {
+            lines.add("$label:")
+        }
+
+        // Code or data lines.
+        when (segment) {
+            is InstructionSegment -> {
+                var inVaList = false
+
+                segment.instructions.forEachIndexed { i, instruction ->
+                    val opcode = instruction.opcode
+
+                    if (opcode.code == OP_VA_START.code) {
+                        inVaList = true
+                    } else if (opcode.code == OP_VA_END.code) {
+                        inVaList = false
+                    }
+
+                    if (inlineStackArgs &&
+                        !inVaList &&
+                        opcode.stack == StackInteraction.Push &&
+                        canInlinePushedArg(segment, i)
+                    ) {
+                        stack.addAll(addTypeToArgs(opcode.params, instruction.args))
+                    } else {
+                        val sb = StringBuilder(INDENT)
+                        sb.append(opcode.mnemonic)
+
+                        if (opcode.stack == StackInteraction.Pop) {
+                            if (inlineStackArgs) {
+                                sb.appendArgs(
+                                    opcode.params,
+                                    stack.takeLast(opcode.params.size),
+                                    stack = true,
+                                )
+                            }
+                        } else {
+                            sb.appendArgs(
+                                opcode.params,
+                                addTypeToArgs(opcode.params, instruction.args),
+                                stack = false
+                            )
+                        }
+
+                        if (opcode.stack != StackInteraction.Push) {
+                            stack.clear()
+                        }
+
+                        lines.add(sb.toString())
+                    }
+                }
+            }
+
+            is DataSegment -> {
+                val sb = StringBuilder(INDENT)
+
+                for (i in 0 until segment.data.size) {
+                    sb.append("0x")
+                    sb.append(segment.data.getUByte(i).toString(16).padStart(2, '0'))
+
+                    when {
+                        // Last line.
+                        i == segment.data.size - 1 -> {
+                            lines.add(sb.toString())
+                        }
+                        // Start a new line after every 16 bytes.
+                        i % 16 == 15 -> {
+                            lines.add(sb.toString())
+                            sb.setLength(0)
+                            sb.append(INDENT)
+                        }
+                        // Add a space between each byte.
+                        else -> {
+                            sb.append(" ")
+                        }
+                    }
+                }
+            }
+
+            is StringSegment -> {
+                lines.add(StringBuilder(INDENT).appendStringSegment(segment.value).toString())
+            }
+        }
+    }
+
+    // Ensure newline at the end.
+    lines.add("")
+
+    logger.trace { "Disassembly finished, line count: ${lines.size}." }
+
+    return lines
+}
+
+private data class ArgWithType(val arg: Arg, val type: AnyType)
+
+private fun canInlinePushedArg(segment: InstructionSegment, index: Int): Boolean {
+    var pushedArgCount = 0
+
+    for (i in index until segment.instructions.size) {
+        val opcode = segment.instructions[i].opcode
+
+        when (opcode.stack) {
+            StackInteraction.Push -> pushedArgCount++
+
+            StackInteraction.Pop -> {
+                var paramCount = 0
+                var varArgs = false
+
+                for (param in opcode.params) {
+                    when (param.type) {
+                        is ILabelVarType -> varArgs = true
+                        is RegRefVarType -> varArgs = true
+                        else -> paramCount++
+                    }
+                }
+
+                return pushedArgCount <= paramCount || (pushedArgCount > paramCount && varArgs)
+            }
+
+            null -> return false
+        }
+    }
+
+    return false
+}
+
+private fun addTypeToArgs(params: List<Param>, args: List<Arg>): List<ArgWithType> {
+    val argsWithType = mutableListOf<ArgWithType>()
+
+    for (i in 0 until min(params.size, args.size)) {
+        argsWithType.add(ArgWithType(args[i], params[i].type))
+    }
+
+    // Deal with varargs.
+    val lastParam = params.lastOrNull()
+
+    if (
+        lastParam != null &&
+        (lastParam.type == ILabelVarType || lastParam.type == RegRefVarType)
+    ) {
+        for (i in argsWithType.size until args.size) {
+            argsWithType.add(ArgWithType(args[i], lastParam.type))
+        }
+    }
+
+    return argsWithType
+}
+
+private fun StringBuilder.appendArgs(params: List<Param>, args: List<ArgWithType>, stack: Boolean) {
+    var i = 0
+
+    while (i < params.size) {
+        val paramType = params[i].type
+
+        if (i == 0) {
+            append(" ")
+        } else {
+            append(", ")
+        }
+
+        if (i < args.size) {
+            val (arg, argType) = args[i]
+
+            if (argType is RegTupRefType) {
+                append("r")
+                append(arg.value)
+            } else {
+                when (paramType) {
+                    FloatType -> {
+                        // Floats are pushed onto the stack as integers with arg_pushl.
+                        if (stack) {
+                            append((arg.value as Int).reinterpretAsFloat())
+                        } else {
+                            append(arg.value)
+                        }
+                    }
+
+                    ILabelVarType -> {
+                        while (i < args.size) {
+                            append(args[i].arg.value)
+                            if (i < args.lastIndex) append(", ")
+                            i++
+                        }
+                    }
+
+                    RegRefVarType -> {
+                        while (i < args.size) {
+                            append("r")
+                            append(args[i].arg.value)
+                            if (i < args.lastIndex) append(", ")
+                            i++
+                        }
+                    }
+
+                    RegRefType,
+                    is RegTupRefType,
+                    -> {
+                        append("r")
+                        append(arg.value)
+                    }
+
+                    StringType -> {
+                        appendStringArg(arg.value as String)
+                    }
+
+                    else -> {
+                        append(arg.value)
+                    }
+                }
+            }
+        }
+
+        i++
+    }
+}
+
+private fun StringBuilder.appendStringArg(value: String) {
+    append("\"")
+
+    for (char in value) {
+        when (char) {
+            '\r' -> append("\\r")
+            '\n' -> append("\\n")
+            '\t' -> append("\\t")
+            '"' -> append("\\\"")
+            else -> append(char)
+        }
+    }
+
+    append("\"")
+}
+
+private fun StringBuilder.appendStringSegment(value: String) {
+    append("\"")
+
+    var i = 0
+
+    while (i < value.length) {
+        when (val char = value[i]) {
+            // Replace <cr> with \n.
+            '<' -> {
+                if (i + 3 < value.length &&
+                    value[i + 1] == 'c' &&
+                    value[i + 2] == 'r' &&
+                    value[i + 3] == '>'
+                ) {
+                    append("\\n")
+                    i += 3
+                } else {
+                    append(char)
+                }
+            }
+            '\r' -> append("\\r")
+            '\n' -> append("\\n")
+            '\t' -> append("\\t")
+            '"' -> append("\\\"")
+            else -> append(char)
+        }
+
+        i++
+    }
+
+    append("\"")
+}

lib/src/commonMain/kotlin/world/phantasmal/lib/assembly/Instructions.kt

@@ -58,11 +58,12 @@ fun instructionSize(instruction: Instruction, dcGcFormat: Boolean): Int {
             is RegTupRefType,
             -> 1
 
+            // Ensure this case is before the LabelType case because ILabelVarType extends
+            // LabelType.
+            is ILabelVarType -> 1 + 2 * args.size
+
             is ShortType,
             is LabelType,
-            is ILabelType,
-            is DLabelType,
-            is SLabelType,
             -> 2
 
             is IntType,
@@ -77,8 +78,6 @@ fun instructionSize(instruction: Instruction, dcGcFormat: Boolean): Int {
                 }
             }
 
-            is ILabelVarType -> 1 + 2 * args.size
-
             is RegRefVarType -> 1 + args.size
 
             else -> error("Parameter type ${type::class} not implemented.")

lib/src/commonMain/kotlin/world/phantasmal/lib/assembly/Opcode.kt

@@ -62,7 +62,7 @@ object DLabelType : LabelType()
 object SLabelType : LabelType()
 
 /**
- * Arbitrary amount of instruction labels.
+ * Arbitrary amount of instruction labels (variadic arguments).
  */
 object ILabelVarType : LabelType()
 
@@ -88,7 +88,7 @@ object RegRefType : RefType()
 class RegTupRefType(val registerTuple: List<Param>) : RefType()
 
 /**
- * Arbitrary amount of register references.
+ * Arbitrary amount of register references (variadic arguments).
  */
 object RegRefVarType : RefType()
 

lib/src/commonMain/kotlin/world/phantasmal/lib/assembly/dataFlowAnalysis/ControlFlowGraph.kt

@@ -5,10 +5,30 @@ import world.phantasmal.lib.assembly.*
 // See https://en.wikipedia.org/wiki/Control-flow_graph.
 
 enum class BranchType {
+    /**
+     * Only encountered when the last segment of a script has no jump or return.
+     */
     None,
+
+    /**
+     * ret
+     */
     Return,
+
+    /**
+     * jmp or switch_jmp. switch_jmp is a non-conditional jump because it always jumps even though
+     * the jump location is dynamic.
+     */
     Jump,
+
+    /**
+     * Every other jump instruction.
+     */
     ConditionalJump,
+
+    /**
+     * call, switch_call or va_call.
+     */
     Call,
 }
 
@@ -180,7 +200,7 @@ private fun createBasicBlocks(cfg: ControlFlowGraphBuilder, segment: Instruction
                 branchLabels = listOf(inst.args[2].value as Int)
             }
             OP_SWITCH_JMP.code -> {
-                branchType = BranchType.ConditionalJump
+                branchType = BranchType.Jump
                 branchLabels = inst.args.drop(1).map { it.value as Int }
             }
 
@@ -248,7 +268,7 @@ private fun linkBlocks(cfg: ControlFlowGraphBuilder) {
             BranchType.ConditionalJump,
             -> nextBlock?.let(block::linkTo)
 
-            else -> {
+            BranchType.Jump -> {
                 // Ignore.
             }
         }

lib/src/commonMain/kotlin/world/phantasmal/lib/fileFormats/quest/ByteCode.kt

@@ -411,7 +411,7 @@ private fun parseInstructionsSegment(
         for (i in instructions.size - 1 downTo 0) {
             val opcode = instructions[i].opcode.code
 
-            if (opcode == OP_RET.code || opcode == OP_JMP.code) {
+            if (opcode == OP_RET.code || opcode == OP_JMP.code || opcode == OP_SWITCH_JMP.code) {
                 dropThrough = false
                 break
             }
@@ -506,11 +506,7 @@ private fun parseInstructionArguments(
                     args.addAll(cursor.uShortArray(argSize.toInt()).map { Arg(it.toInt()) })
                 }
 
-                is LabelType,
+                is LabelType -> {
-                is ILabelType,
-                is DLabelType,
-                is SLabelType,
-                -> {
                     args.add(Arg(cursor.uShort().toInt()))
                 }
 

lib/src/commonTest/kotlin/world/phantasmal/lib/assembly/AssemblyTokenizationTests.kt

@@ -0,0 +1,47 @@
+package world.phantasmal.lib.assembly
+
+import world.phantasmal.lib.test.LibTestSuite
+import world.phantasmal.testUtils.assertCloseTo
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class AssemblyTokenizationTests : LibTestSuite() {
+    @Test
+    fun valid_floats_are_parsed_as_FloatTokens() {
+        assertCloseTo(808.9f, (tokenizeLine("808.9")[0] as FloatToken).value)
+        assertCloseTo(-0.9f, (tokenizeLine("-0.9")[0] as FloatToken).value)
+        assertCloseTo(0.001f, (tokenizeLine("1e-3")[0] as FloatToken).value)
+        assertCloseTo(-600.0f, (tokenizeLine("-6e2")[0] as FloatToken).value)
+    }
+
+    @Test
+    fun invalid_floats_area_parsed_as_InvalidNumberTokens_or_InvalidSectionTokens() {
+        val tokens1 = tokenizeLine(" 808.9a ")
+
+        assertEquals(1, tokens1.size)
+        assertEquals(InvalidNumberToken::class, tokens1[0]::class)
+        assertEquals(2, tokens1[0].col)
+        assertEquals(6, tokens1[0].len)
+
+        val tokens2 = tokenizeLine("  -55e ")
+
+        assertEquals(1, tokens2.size)
+        assertEquals(InvalidNumberToken::class, tokens2[0]::class)
+        assertEquals(3, tokens2[0].col)
+        assertEquals(4, tokens2[0].len)
+
+        val tokens3 = tokenizeLine(".7429")
+
+        assertEquals(1, tokens3.size)
+        assertEquals(InvalidSectionToken::class, tokens3[0]::class)
+        assertEquals(1, tokens3[0].col)
+        assertEquals(5, tokens3[0].len)
+
+        val tokens4 = tokenizeLine("\t\t\t4. test")
+
+        assertEquals(2, tokens4.size)
+        assertEquals(InvalidNumberToken::class, tokens4[0]::class)
+        assertEquals(4, tokens4[0].col)
+        assertEquals(2, tokens4[0].len)
+    }
+}

observable/src/commonMain/kotlin/world/phantasmal/observable/value/ValExtensions.kt

@@ -18,6 +18,9 @@ fun Val<Any?>.isNull(): Val<Boolean> =
 fun Val<Any?>.isNotNull(): Val<Boolean> =
     map { it != null }
 
+fun <T> Val<T?>.orElse(defaultValue: () -> T): Val<T> =
+    map { it ?: defaultValue() }
+
 infix fun <T : Comparable<T>> Val<T>.gt(value: T): Val<Boolean> =
     map { it > value }
 

observable/src/commonTest/kotlin/world/phantasmal/observable/value/RegularValTests.kt

@@ -25,6 +25,9 @@ abstract class RegularValTests : ValTests() {
 
             // Test `isNotNull`.
             assertEquals(any != null, value.isNotNull().value)
+
+            // Test `orElse`.
+            assertEquals(any ?: "default", value.orElse { "default" }.value)
         }
         listOf(10 to 10, 5 to 99, "a" to "a", "x" to "y").forEach { (a, b) ->
             val aVal = createWithValue(a)

web/build.gradle.kts

@@ -39,8 +39,11 @@ dependencies {
     implementation("io.ktor:ktor-client-core-js:$ktorVersion")
     implementation("io.ktor:ktor-client-serialization-js:$ktorVersion")
     implementation("org.jetbrains.kotlinx:kotlinx-serialization-core-js:1.0.0")
-    implementation(npm("golden-layout", "1.5.9"))
+    implementation(npm("@babylonjs/core", "^4.2.0-rc.5"))
-    implementation(npm("@babylonjs/core", "4.2.0-rc.5"))
+    implementation(npm("golden-layout", "^1.5.9"))
+    implementation(npm("monaco-editor", "^0.21.2"))
+
+    implementation(devNpm("file-loader", "^6.0.0"))
 
     testImplementation(kotlin("test-js"))
     testImplementation(project(":test-utils"))

web/src/main/kotlin/world/phantasmal/web/core/widgets/DockWidget.kt

@@ -51,8 +51,6 @@ class DockWidget(
 
     init {
         js("""require("golden-layout/src/css/goldenlayout-base.css");""")
-
-        observeResize()
     }
 
     override fun Node.createElement() =
@@ -94,11 +92,11 @@ class DockWidget(
 
             style.width = ""
             style.height = ""
-        }
 
-    override fun resized(width: Double, height: Double) {
+            addDisposable(size.observe { (size) ->
-        goldenLayout.updateSize(width, height)
+                goldenLayout.updateSize(size.width, size.height)
-    }
+            })
+        }
 
     override fun internalDispose() {
         goldenLayout.destroy()
@@ -155,6 +153,7 @@ class DockWidget(
                 .pw-core-dock {
                     width: 100%;
                     height: 100%;
+                    overflow: hidden;
                 }
                 
                 #pw-root .lm_header {

web/src/main/kotlin/world/phantasmal/web/core/widgets/RendererWidget.kt

@@ -19,8 +19,6 @@ class RendererWidget(
             className = "pw-core-renderer"
             tabIndex = -1
 
-            observeResize()
-
             observe(selfOrAncestorVisible) { visible ->
                 if (visible) {
                     renderer.startRendering()
@@ -29,14 +27,14 @@ class RendererWidget(
                 }
             }
 
+            addDisposable(size.observe { (size) ->
+                canvas.width = floor(size.width).toInt()
+                canvas.height = floor(size.height).toInt()
+            })
+
             append(canvas)
         }
 
-    override fun resized(width: Double, height: Double) {
-        canvas.width = floor(width).toInt()
-        canvas.height = floor(height).toInt()
-    }
-
     companion object {
         init {
             @Suppress("CssUnusedSymbol")

web/src/main/kotlin/world/phantasmal/web/externals/babylon/babylon.kt

@@ -495,4 +495,11 @@ external class Color4(
     var g: Double
     var b: Double
     var a: Double
+
+    companion object {
+        /**
+         * Creates a new Color4 from integer values (< 256)
+         */
+        fun FromInts(r: Int, g: Int, b: Int, a: Int): Color4
+    }
 }

web/src/main/kotlin/world/phantasmal/web/externals/monacoEditor/editor.kt

@@ -0,0 +1,769 @@
+@file:JsModule("monaco-editor")
+@file:JsNonModule
+@file:JsQualifier("editor")
+@file:Suppress("unused", "PropertyName")
+
+package world.phantasmal.web.externals.monacoEditor
+
+import org.w3c.dom.HTMLElement
+import org.w3c.dom.Range
+
+external fun create(
+    domElement: HTMLElement,
+    options: IStandaloneEditorConstructionOptions = definedExternally,
+): IStandaloneCodeEditor
+
+external fun createModel(
+    value: String,
+    language: String = definedExternally,
+    uri: Uri = definedExternally,
+): ITextModel
+
+external fun defineTheme(themeName: String, themeData: IStandaloneThemeData)
+
+external interface IStandaloneThemeData {
+    var base: String /* 'vs' | 'vs-dark' | 'hc-black' */
+    var inherit: Boolean
+    var rules: Array<ITokenThemeRule>
+    var encodedTokensColors: Array<String>?
+    var colors: IColors
+}
+
+external interface IColors
+
+external interface ITokenThemeRule {
+    var token: String
+    var foreground: String?
+    var background: String?
+    var fontStyle: String?
+}
+
+external enum class ScrollType {
+    Smooth /* = 0 */,
+    Immediate /* = 1 */
+}
+
+external interface IDimension {
+    var width: Number
+    var height: Number
+}
+
+external interface IEditor {
+    fun onDidDispose(listener: () -> Unit): IDisposable
+    fun dispose()
+    fun getId(): String
+    fun getEditorType(): String
+    fun updateOptions(newOptions: IEditorOptions)
+    fun layout(dimension: IDimension = definedExternally)
+    fun focus()
+    fun hasTextFocus(): Boolean
+    fun saveViewState(): dynamic /* ICodeEditorViewState? | IDiffEditorViewState? */
+    fun getVisibleColumnFromPosition(position: IPosition): Number
+    fun getPosition(): Position?
+    fun setPosition(position: IPosition)
+    fun revealLine(lineNumber: Number, scrollType: ScrollType = definedExternally)
+    fun revealLineInCenter(lineNumber: Number, scrollType: ScrollType = definedExternally)
+    fun revealLineInCenterIfOutsideViewport(
+        lineNumber: Number,
+        scrollType: ScrollType = definedExternally,
+    )
+
+    fun revealLineNearTop(lineNumber: Number, scrollType: ScrollType = definedExternally)
+    fun revealPosition(position: IPosition, scrollType: ScrollType = definedExternally)
+    fun revealPositionInCenter(position: IPosition, scrollType: ScrollType = definedExternally)
+    fun revealPositionInCenterIfOutsideViewport(
+        position: IPosition,
+        scrollType: ScrollType = definedExternally,
+    )
+
+    fun revealPositionNearTop(position: IPosition, scrollType: ScrollType = definedExternally)
+    fun getSelection(): Selection?
+    fun getSelections(): Array<Selection>?
+    fun setSelection(selection: IRange)
+    fun setSelection(selection: Range)
+    fun setSelection(selection: ISelection)
+    fun setSelection(selection: Selection)
+    fun setSelections(selections: Any)
+    fun revealLines(
+        startLineNumber: Number,
+        endLineNumber: Number,
+        scrollType: ScrollType = definedExternally,
+    )
+
+    fun revealLinesInCenter(
+        lineNumber: Number,
+        endLineNumber: Number,
+        scrollType: ScrollType = definedExternally,
+    )
+
+    fun revealLinesInCenterIfOutsideViewport(
+        lineNumber: Number,
+        endLineNumber: Number,
+        scrollType: ScrollType = definedExternally,
+    )
+
+    fun revealLinesNearTop(
+        lineNumber: Number,
+        endLineNumber: Number,
+        scrollType: ScrollType = definedExternally,
+    )
+
+    fun revealRange(range: IRange, scrollType: ScrollType = definedExternally)
+    fun revealRangeInCenter(range: IRange, scrollType: ScrollType = definedExternally)
+    fun revealRangeAtTop(range: IRange, scrollType: ScrollType = definedExternally)
+    fun revealRangeInCenterIfOutsideViewport(
+        range: IRange,
+        scrollType: ScrollType = definedExternally,
+    )
+
+    fun revealRangeNearTop(range: IRange, scrollType: ScrollType = definedExternally)
+    fun revealRangeNearTopIfOutsideViewport(
+        range: IRange,
+        scrollType: ScrollType = definedExternally,
+    )
+
+    fun trigger(source: String?, handlerId: String, payload: Any)
+    fun getModel(): dynamic /* ITextModel? | IDiffEditorModel? */
+    fun setModel(model: ITextModel?)
+}
+
+external interface ICodeEditor : IEditor {
+    fun onDidChangeModelContent(listener: (e: IModelContentChangedEvent) -> Unit): IDisposable
+    fun onDidChangeModelLanguage(listener: (e: IModelLanguageChangedEvent) -> Unit): IDisposable
+    fun onDidChangeModelLanguageConfiguration(listener: (e: IModelLanguageConfigurationChangedEvent) -> Unit): IDisposable
+    fun onDidChangeModelOptions(listener: (e: IModelOptionsChangedEvent) -> Unit): IDisposable
+    fun onDidChangeCursorPosition(listener: (e: ICursorPositionChangedEvent) -> Unit): IDisposable
+    fun onDidChangeCursorSelection(listener: (e: ICursorSelectionChangedEvent) -> Unit): IDisposable
+    fun onDidChangeModelDecorations(listener: (e: IModelDecorationsChangedEvent) -> Unit): IDisposable
+    fun onDidFocusEditorText(listener: () -> Unit): IDisposable
+    fun onDidBlurEditorText(listener: () -> Unit): IDisposable
+    fun onDidFocusEditorWidget(listener: () -> Unit): IDisposable
+    fun onDidBlurEditorWidget(listener: () -> Unit): IDisposable
+    fun onDidCompositionStart(listener: () -> Unit): IDisposable
+    fun onDidCompositionEnd(listener: () -> Unit): IDisposable
+    fun onDidAttemptReadOnlyEdit(listener: () -> Unit): IDisposable
+    fun hasWidgetFocus(): Boolean
+    override fun getModel(): ITextModel?
+    override fun setModel(model: ITextModel?)
+    fun getRawOptions(): IEditorOptions
+    fun setValue(newValue: String)
+    fun getContentWidth(): Number
+    fun getScrollWidth(): Number
+    fun getScrollLeft(): Number
+    fun getContentHeight(): Number
+    fun getScrollHeight(): Number
+    fun getScrollTop(): Number
+    fun pushUndoStop(): Boolean
+    fun executeEdits(
+        source: String?,
+        edits: Array<IIdentifiedSingleEditOperation>,
+        endCursorState: ICursorStateComputer = definedExternally,
+    ): Boolean
+
+    fun executeEdits(
+        source: String?,
+        edits: Array<IIdentifiedSingleEditOperation>,
+        endCursorState: Array<Selection> = definedExternally,
+    ): Boolean
+
+    fun getLineDecorations(lineNumber: Number): Array<IModelDecoration>?
+    fun deltaDecorations(
+        oldDecorations: Array<String>,
+        newDecorations: Array<IModelDeltaDecoration>,
+    ): Array<String>
+
+    fun getVisibleRanges(): Array<Range>
+    fun getTopForLineNumber(lineNumber: Number): Number
+    fun getTopForPosition(lineNumber: Number, column: Number): Number
+    fun getContainerDomNode(): HTMLElement
+    fun getDomNode(): HTMLElement?
+    fun getOffsetForColumn(lineNumber: Number, column: Number): Number
+    fun render(forceRedraw: Boolean = definedExternally)
+    fun applyFontInfo(target: HTMLElement)
+}
+
+external interface IStandaloneCodeEditor : ICodeEditor {
+    override fun updateOptions(newOptions: IEditorOptions /* IEditorOptions & IGlobalEditorOptions */)
+}
+
+external interface IGlobalEditorOptions {
+    var tabSize: Number?
+    var insertSpaces: Boolean?
+    var detectIndentation: Boolean?
+    var trimAutoWhitespace: Boolean?
+    var largeFileOptimizations: Boolean?
+    var wordBasedSuggestions: Boolean?
+    var stablePeek: Boolean?
+    var maxTokenizationLineLength: Number?
+    var theme: String?
+}
+
+external interface IEditorScrollbarOptions {
+    var arrowSize: Number?
+    var vertical: String? /* 'auto' | 'visible' | 'hidden' */
+    var horizontal: String? /* 'auto' | 'visible' | 'hidden' */
+    var useShadows: Boolean?
+    var verticalHasArrows: Boolean?
+    var horizontalHasArrows: Boolean?
+    var handleMouseWheel: Boolean?
+    var alwaysConsumeMouseWheel: Boolean?
+    var horizontalScrollbarSize: Number?
+    var verticalScrollbarSize: Number?
+    var verticalSliderSize: Number?
+    var horizontalSliderSize: Number?
+}
+
+external interface IEditorMinimapOptions {
+    var enabled: Boolean?
+    var side: String? /* 'right' | 'left' */
+    var size: String? /* 'proportional' | 'fill' | 'fit' */
+    var showSlider: String? /* 'always' | 'mouseover' */
+    var renderCharacters: Boolean?
+    var maxColumn: Number?
+    var scale: Number?
+}
+
+external interface IEditorFindOptions {
+    var cursorMoveOnType: Boolean?
+    var seedSearchStringFromSelection: Boolean?
+    var autoFindInSelection: String? /* 'never' | 'always' | 'multiline' */
+    var addExtraSpaceOnTop: Boolean?
+    var loop: Boolean?
+}
+
+external interface IEditorOptions {
+    var inDiffEditor: Boolean?
+    var ariaLabel: String?
+    var tabIndex: Number?
+    var rulers: Array<dynamic /* Number | IRulerOption */>?
+    var wordSeparators: String?
+    var selectionClipboard: Boolean?
+    var lineNumbers: dynamic /* String | String | String | String | ((lineNumber: Number) -> String)? */
+    var cursorSurroundingLines: Number?
+    var cursorSurroundingLinesStyle: String? /* 'default' | 'all' */
+    var renderFinalNewline: Boolean?
+    var unusualLineTerminators: String? /* 'off' | 'prompt' | 'auto' */
+    var selectOnLineNumbers: Boolean?
+    var lineNumbersMinChars: Number?
+    var glyphMargin: Boolean?
+    var lineDecorationsWidth: dynamic /* Number? | String? */
+    var revealHorizontalRightPadding: Number?
+    var roundedSelection: Boolean?
+    var extraEditorClassName: String?
+    var readOnly: Boolean?
+    var renameOnType: Boolean?
+    var renderValidationDecorations: String? /* 'editable' | 'on' | 'off' */
+    var scrollbar: IEditorScrollbarOptions?
+    var minimap: IEditorMinimapOptions?
+    var find: IEditorFindOptions?
+    var fixedOverflowWidgets: Boolean?
+    var overviewRulerLanes: Number?
+    var overviewRulerBorder: Boolean?
+    var cursorBlinking: String? /* 'blink' | 'smooth' | 'phase' | 'expand' | 'solid' */
+    var mouseWheelZoom: Boolean?
+    var mouseStyle: String? /* 'text' | 'default' | 'copy' */
+    var cursorSmoothCaretAnimation: Boolean?
+    var cursorStyle: String? /* 'line' | 'block' | 'underline' | 'line-thin' | 'block-outline' | 'underline-thin' */
+    var cursorWidth: Number?
+    var fontLigatures: dynamic /* Boolean? | String? */
+    var disableLayerHinting: Boolean?
+    var disableMonospaceOptimizations: Boolean?
+    var hideCursorInOverviewRuler: Boolean?
+    var scrollBeyondLastLine: Boolean?
+    var scrollBeyondLastColumn: Number?
+    var smoothScrolling: Boolean?
+    var automaticLayout: Boolean?
+    var wordWrap: String? /* 'off' | 'on' | 'wordWrapColumn' | 'bounded' */
+    var wordWrapColumn: Number?
+    var wordWrapMinified: Boolean?
+    var wrappingIndent: String? /* 'none' | 'same' | 'indent' | 'deepIndent' */
+    var wrappingStrategy: String? /* 'simple' | 'advanced' */
+    var wordWrapBreakBeforeCharacters: String?
+    var wordWrapBreakAfterCharacters: String?
+    var stopRenderingLineAfter: Number?
+    var links: Boolean?
+    var colorDecorators: Boolean?
+    var contextmenu: Boolean?
+    var mouseWheelScrollSensitivity: Number?
+    var fastScrollSensitivity: Number?
+    var scrollPredominantAxis: Boolean?
+    var columnSelection: Boolean?
+    var multiCursorModifier: String? /* 'ctrlCmd' | 'alt' */
+    var multiCursorMergeOverlapping: Boolean?
+    var multiCursorPaste: String? /* 'spread' | 'full' */
+    var accessibilitySupport: String? /* 'auto' | 'off' | 'on' */
+    var accessibilityPageSize: Number?
+    var quickSuggestions: dynamic /* Boolean? | IQuickSuggestionsOptions? */
+    var quickSuggestionsDelay: Number?
+    var autoClosingBrackets: String? /* 'always' | 'languageDefined' | 'beforeWhitespace' | 'never' */
+    var autoClosingQuotes: String? /* 'always' | 'languageDefined' | 'beforeWhitespace' | 'never' */
+    var autoClosingOvertype: String? /* 'always' | 'auto' | 'never' */
+    var autoSurround: String? /* 'languageDefined' | 'quotes' | 'brackets' | 'never' */
+    var autoIndent: String? /* 'none' | 'keep' | 'brackets' | 'advanced' | 'full' */
+    var formatOnType: Boolean?
+    var formatOnPaste: Boolean?
+    var dragAndDrop: Boolean?
+    var suggestOnTriggerCharacters: Boolean?
+    var acceptSuggestionOnEnter: String? /* 'on' | 'smart' | 'off' */
+    var acceptSuggestionOnCommitCharacter: Boolean?
+    var snippetSuggestions: String? /* 'top' | 'bottom' | 'inline' | 'none' */
+    var emptySelectionClipboard: Boolean?
+    var copyWithSyntaxHighlighting: Boolean?
+    var suggestSelection: String? /* 'first' | 'recentlyUsed' | 'recentlyUsedByPrefix' */
+    var suggestFontSize: Number?
+    var suggestLineHeight: Number?
+    var tabCompletion: String? /* 'on' | 'off' | 'onlySnippets' */
+    var selectionHighlight: Boolean?
+    var occurrencesHighlight: Boolean?
+    var codeLens: Boolean?
+    var codeActionsOnSaveTimeout: Number?
+    var folding: Boolean?
+    var foldingStrategy: String? /* 'auto' | 'indentation' */
+    var foldingHighlight: Boolean?
+    var showFoldingControls: String? /* 'always' | 'mouseover' */
+    var unfoldOnClickAfterEndOfLine: Boolean?
+    var matchBrackets: String? /* 'never' | 'near' | 'always' */
+    var renderWhitespace: String? /* 'none' | 'boundary' | 'selection' | 'trailing' | 'all' */
+    var renderControlCharacters: Boolean?
+    var renderIndentGuides: Boolean?
+    var highlightActiveIndentGuide: Boolean?
+    var renderLineHighlight: String? /* 'none' | 'gutter' | 'line' | 'all' */
+    var renderLineHighlightOnlyWhenFocus: Boolean?
+    var useTabStops: Boolean?
+    var fontFamily: String?
+    var fontWeight: String?
+    var fontSize: Number?
+    var lineHeight: Number?
+    var letterSpacing: Number?
+    var showUnused: Boolean?
+    var peekWidgetDefaultFocus: String? /* 'tree' | 'editor' */
+    var definitionLinkOpensInPeek: Boolean?
+    var showDeprecated: Boolean?
+}
+
+external interface IEditorConstructionOptions : IEditorOptions {
+    var overflowWidgetsDomNode: HTMLElement?
+}
+
+external interface IStandaloneEditorConstructionOptions : IEditorConstructionOptions,
+    IGlobalEditorOptions {
+    var model: ITextModel?
+    var value: String?
+    var language: String?
+    override var theme: String?
+    var accessibilityHelpUrl: String?
+}
+
+external interface IMarker {
+    var owner: String
+    var resource: Uri
+    var severity: MarkerSeverity
+    var code: dynamic /* String? | `T$5`? */
+    var message: String
+    var source: String?
+    var startLineNumber: Number
+    var startColumn: Number
+    var endLineNumber: Number
+    var endColumn: Number
+    var relatedInformation: Array<IRelatedInformation>?
+    var tags: Array<MarkerTag>?
+}
+
+external interface IMarkerData {
+    var code: dynamic /* String? | `T$5`? */
+    var severity: MarkerSeverity
+    var message: String
+    var source: String?
+    var startLineNumber: Number
+    var startColumn: Number
+    var endLineNumber: Number
+    var endColumn: Number
+    var relatedInformation: Array<IRelatedInformation>?
+    var tags: Array<MarkerTag>?
+}
+
+external interface IRelatedInformation {
+    var resource: Uri
+    var message: String
+    var startLineNumber: Number
+    var startColumn: Number
+    var endLineNumber: Number
+    var endColumn: Number
+}
+
+external interface IColorizerOptions {
+    var tabSize: Number?
+}
+
+external interface IColorizerElementOptions : IColorizerOptions {
+    var theme: String?
+    var mimeType: String?
+}
+
+external enum class ScrollbarVisibility {
+    Auto /* = 1 */,
+    Hidden /* = 2 */,
+    Visible /* = 3 */
+}
+
+external interface ThemeColor {
+    var id: String
+}
+
+external enum class OverviewRulerLane {
+    Left /* = 1 */,
+    Center /* = 2 */,
+    Right /* = 4 */,
+    Full /* = 7 */
+}
+
+external enum class MinimapPosition {
+    Inline /* = 1 */,
+    Gutter /* = 2 */
+}
+
+external interface IDecorationOptions {
+    var color: dynamic /* String? | ThemeColor? */
+    var darkColor: dynamic /* String? | ThemeColor? */
+}
+
+external interface IModelDecorationOverviewRulerOptions : IDecorationOptions {
+    var position: OverviewRulerLane
+}
+
+external interface IModelDecorationMinimapOptions : IDecorationOptions {
+    var position: MinimapPosition
+}
+
+external interface IModelDecorationOptions {
+    var stickiness: TrackedRangeStickiness?
+    var className: String?
+    var glyphMarginHoverMessage: dynamic /* IMarkdownString? | Array<IMarkdownString>? */
+    var hoverMessage: dynamic /* IMarkdownString? | Array<IMarkdownString>? */
+    var isWholeLine: Boolean?
+    var zIndex: Number?
+    var overviewRuler: IModelDecorationOverviewRulerOptions?
+    var minimap: IModelDecorationMinimapOptions?
+    var glyphMarginClassName: String?
+    var linesDecorationsClassName: String?
+    var firstLineDecorationClassName: String?
+    var marginClassName: String?
+    var inlineClassName: String?
+    var inlineClassNameAffectsLetterSpacing: Boolean?
+    var beforeContentClassName: String?
+    var afterContentClassName: String
+}
+
+external interface IModelDeltaDecoration {
+    var range: IRange
+    var options: IModelDecorationOptions
+}
+
+external interface IModelDecoration {
+    var id: String
+    var ownerId: Number
+    var range: Range
+    var options: IModelDecorationOptions
+}
+
+external interface IWordAtPosition {
+    var word: String
+    var startColumn: Number
+    var endColumn: Number
+}
+
+external enum class EndOfLinePreference {
+    TextDefined /* = 0 */,
+    LF /* = 1 */,
+    CRLF /* = 2 */
+}
+
+external enum class DefaultEndOfLine {
+    LF /* = 1 */,
+    CRLF /* = 2 */
+}
+
+external enum class EndOfLineSequence {
+    LF /* = 0 */,
+    CRLF /* = 1 */
+}
+
+external interface ISingleEditOperation {
+    var range: IRange
+    var text: String?
+    var forceMoveMarkers: Boolean?
+}
+
+external interface IIdentifiedSingleEditOperation {
+    var range: IRange
+    var text: String?
+    var forceMoveMarkers: Boolean?
+}
+
+external interface IValidEditOperation {
+    var range: Range
+    var text: String
+}
+
+external interface ICursorStateComputer
+
+open external class TextModelResolvedOptions {
+    open var _textModelResolvedOptionsBrand: Unit
+    open var tabSize: Number
+    open var indentSize: Number
+    open var insertSpaces: Boolean
+    open var defaultEOL: DefaultEndOfLine
+    open var trimAutoWhitespace: Boolean
+}
+
+external interface ITextModelUpdateOptions {
+    var tabSize: Number?
+    var indentSize: Number?
+    var insertSpaces: Boolean?
+    var trimAutoWhitespace: Boolean?
+}
+
+open external class FindMatch {
+    open var _findMatchBrand: Unit
+    open var range: Range
+    open var matches: Array<String>?
+}
+
+external enum class TrackedRangeStickiness {
+    AlwaysGrowsWhenTypingAtEdges /* = 0 */,
+    NeverGrowsWhenTypingAtEdges /* = 1 */,
+    GrowsOnlyWhenTypingBefore /* = 2 */,
+    GrowsOnlyWhenTypingAfter /* = 3 */
+}
+
+external interface ITextModel {
+    var uri: Uri
+    var id: String
+    fun getOptions(): TextModelResolvedOptions
+    fun getVersionId(): Number
+    fun getAlternativeVersionId(): Number
+    fun setValue(newValue: String)
+    fun getValue(
+        eol: EndOfLinePreference = definedExternally,
+        preserveBOM: Boolean = definedExternally,
+    ): String
+
+    fun getValueLength(
+        eol: EndOfLinePreference = definedExternally,
+        preserveBOM: Boolean = definedExternally,
+    ): Number
+
+    fun getValueInRange(range: IRange, eol: EndOfLinePreference = definedExternally): String
+    fun getValueLengthInRange(range: IRange): Number
+    fun getCharacterCountInRange(range: IRange): Number
+    fun getLineCount(): Number
+    fun getLineContent(lineNumber: Number): String
+    fun getLineLength(lineNumber: Number): Number
+    fun getLinesContent(): Array<String>
+    fun getEOL(): String
+    fun getLineMinColumn(lineNumber: Number): Number
+    fun getLineMaxColumn(lineNumber: Number): Number
+    fun getLineFirstNonWhitespaceColumn(lineNumber: Number): Number
+    fun getLineLastNonWhitespaceColumn(lineNumber: Number): Number
+    fun validatePosition(position: IPosition): Position
+    fun modifyPosition(position: IPosition, offset: Number): Position
+    fun validateRange(range: IRange): Range
+    fun getOffsetAt(position: IPosition): Number
+    fun getPositionAt(offset: Number): Position
+    fun getFullModelRange(): Range
+    fun isDisposed(): Boolean
+    fun findMatches(
+        searchString: String,
+        searchOnlyEditableRange: Boolean,
+        isRegex: Boolean,
+        matchCase: Boolean,
+        wordSeparators: String?,
+        captureMatches: Boolean,
+        limitResultCount: Number = definedExternally,
+    ): Array<FindMatch>
+
+    fun findMatches(
+        searchString: String,
+        searchScope: IRange,
+        isRegex: Boolean,
+        matchCase: Boolean,
+        wordSeparators: String?,
+        captureMatches: Boolean,
+        limitResultCount: Number = definedExternally,
+    ): Array<FindMatch>
+
+    fun findMatches(
+        searchString: String,
+        searchScope: Array<IRange>,
+        isRegex: Boolean,
+        matchCase: Boolean,
+        wordSeparators: String?,
+        captureMatches: Boolean,
+        limitResultCount: Number = definedExternally,
+    ): Array<FindMatch>
+
+    fun findNextMatch(
+        searchString: String,
+        searchStart: IPosition,
+        isRegex: Boolean,
+        matchCase: Boolean,
+        wordSeparators: String?,
+        captureMatches: Boolean,
+    ): FindMatch?
+
+    fun findPreviousMatch(
+        searchString: String,
+        searchStart: IPosition,
+        isRegex: Boolean,
+        matchCase: Boolean,
+        wordSeparators: String?,
+        captureMatches: Boolean,
+    ): FindMatch?
+
+    fun getModeId(): String
+    fun getWordAtPosition(position: IPosition): IWordAtPosition?
+    fun getWordUntilPosition(position: IPosition): IWordAtPosition
+    fun deltaDecorations(
+        oldDecorations: Array<String>,
+        newDecorations: Array<IModelDeltaDecoration>,
+        ownerId: Number = definedExternally,
+    ): Array<String>
+
+    fun getDecorationOptions(id: String): IModelDecorationOptions?
+    fun getDecorationRange(id: String): Range?
+    fun getLineDecorations(
+        lineNumber: Number,
+        ownerId: Number = definedExternally,
+        filterOutValidation: Boolean = definedExternally,
+    ): Array<IModelDecoration>
+
+    fun getLinesDecorations(
+        startLineNumber: Number,
+        endLineNumber: Number,
+        ownerId: Number = definedExternally,
+        filterOutValidation: Boolean = definedExternally,
+    ): Array<IModelDecoration>
+
+    fun getDecorationsInRange(
+        range: IRange,
+        ownerId: Number = definedExternally,
+        filterOutValidation: Boolean = definedExternally,
+    ): Array<IModelDecoration>
+
+    fun getAllDecorations(
+        ownerId: Number = definedExternally,
+        filterOutValidation: Boolean = definedExternally,
+    ): Array<IModelDecoration>
+
+    fun getOverviewRulerDecorations(
+        ownerId: Number = definedExternally,
+        filterOutValidation: Boolean = definedExternally,
+    ): Array<IModelDecoration>
+
+    fun normalizeIndentation(str: String): String
+    fun updateOptions(newOpts: ITextModelUpdateOptions)
+    fun detectIndentation(defaultInsertSpaces: Boolean, defaultTabSize: Number)
+    fun pushStackElement()
+    fun pushEditOperations(
+        beforeCursorState: Array<Selection>?,
+        editOperations: Array<IIdentifiedSingleEditOperation>,
+        cursorStateComputer: ICursorStateComputer,
+    ): Array<Selection>?
+
+    fun pushEOL(eol: EndOfLineSequence)
+    fun applyEdits(operations: Array<IIdentifiedSingleEditOperation>)
+    fun applyEdits(
+        operations: Array<IIdentifiedSingleEditOperation>,
+        computeUndoEdits: Boolean,
+    ): dynamic /* Unit | Array */
+
+    fun setEOL(eol: EndOfLineSequence)
+    fun onDidChangeContent(listener: (e: IModelContentChangedEvent) -> Unit): IDisposable
+    fun onDidChangeDecorations(listener: (e: IModelDecorationsChangedEvent) -> Unit): IDisposable
+    fun onDidChangeOptions(listener: (e: IModelOptionsChangedEvent) -> Unit): IDisposable
+    fun onDidChangeLanguage(listener: (e: IModelLanguageChangedEvent) -> Unit): IDisposable
+    fun onDidChangeLanguageConfiguration(listener: (e: IModelLanguageConfigurationChangedEvent) -> Unit): IDisposable
+    fun onWillDispose(listener: () -> Unit): IDisposable
+    fun dispose()
+}
+
+external object EditorType {
+    var ICodeEditor: String
+    var IDiffEditor: String
+}
+
+external interface IModelLanguageChangedEvent {
+    var oldLanguage: String
+    var newLanguage: String
+}
+
+external interface IModelLanguageConfigurationChangedEvent
+
+external interface IModelContentChange {
+    var range: IRange
+    var rangeOffset: Number
+    var rangeLength: Number
+    var text: String
+}
+
+external interface IModelContentChangedEvent {
+    var changes: Array<IModelContentChange>
+    var eol: String
+    var versionId: Number
+    var isUndoing: Boolean
+    var isRedoing: Boolean
+    var isFlush: Boolean
+}
+
+external interface IModelDecorationsChangedEvent {
+    var affectsMinimap: Boolean
+    var affectsOverviewRuler: Boolean
+}
+
+external interface IModelOptionsChangedEvent {
+    var tabSize: Boolean
+    var indentSize: Boolean
+    var insertSpaces: Boolean
+    var trimAutoWhitespace: Boolean
+}
+
+external enum class CursorChangeReason {
+    NotSet /* = 0 */,
+    ContentFlush /* = 1 */,
+    RecoverFromMarkers /* = 2 */,
+    Explicit /* = 3 */,
+    Paste /* = 4 */,
+    Undo /* = 5 */,
+    Redo /* = 6 */
+}
+
+external interface ICursorPositionChangedEvent {
+    var position: Position
+    var secondaryPositions: Array<Position>
+    var reason: CursorChangeReason
+    var source: String
+}
+
+external interface ICursorSelectionChangedEvent {
+    var selection: Selection
+    var secondarySelections: Array<Selection>
+    var modelVersionId: Number
+    var oldSelections: Array<Selection>?
+    var oldModelVersionId: Number
+    var source: String
+    var reason: CursorChangeReason
+}
+
+external enum class AccessibilitySupport {
+    Unknown /* = 0 */,
+    Disabled /* = 1 */,
+    Enabled /* = 2 */
+}
+
+external enum class EditorAutoIndentStrategy {
+    None /* = 0 */,
+    Keep /* = 1 */,
+    Brackets /* = 2 */,
+    Advanced /* = 3 */,
+    Full /* = 4 */
+}

web/src/main/kotlin/world/phantasmal/web/externals/monacoEditor/editorExtensions.kt

@@ -0,0 +1,8 @@
+package world.phantasmal.web.externals.monacoEditor
+
+inline operator fun IColors.get(name: String): String =
+    asDynamic()[name].unsafeCast<String>()
+
+inline operator fun IColors.set(name: String, value: String) {
+    asDynamic()[name] = value
+}

web/src/main/kotlin/world/phantasmal/web/externals/monacoEditor/languages.kt

@@ -0,0 +1,220 @@
+@file:JsModule("monaco-editor")
+@file:JsNonModule
+@file:JsQualifier("languages")
+
+package world.phantasmal.web.externals.monacoEditor
+
+import kotlin.js.RegExp
+
+external fun register(language: ILanguageExtensionPoint)
+
+external fun setLanguageConfiguration(
+    languageId: String,
+    configuration: LanguageConfiguration,
+): IDisposable
+
+external fun setMonarchTokensProvider(
+    languageId: String,
+    languageDef: IMonarchLanguage,
+): IDisposable
+
+external interface CommentRule {
+    var lineComment: String?
+        get() = definedExternally
+        set(value) = definedExternally
+    var blockComment: dynamic /* JsTuple<String, String> */
+        get() = definedExternally
+        set(value) = definedExternally
+}
+
+external interface LanguageConfiguration {
+    var comments: CommentRule?
+        get() = definedExternally
+        set(value) = definedExternally
+    var brackets: Array<dynamic /* JsTuple<String, String> */>?
+        get() = definedExternally
+        set(value) = definedExternally
+    var wordPattern: RegExp?
+        get() = definedExternally
+        set(value) = definedExternally
+    var indentationRules: IndentationRule?
+        get() = definedExternally
+        set(value) = definedExternally
+    var onEnterRules: Array<OnEnterRule>?
+        get() = definedExternally
+        set(value) = definedExternally
+    var autoClosingPairs: Array<IAutoClosingPairConditional>?
+        get() = definedExternally
+        set(value) = definedExternally
+    var surroundingPairs: Array<IAutoClosingPair>?
+        get() = definedExternally
+        set(value) = definedExternally
+    var autoCloseBefore: String?
+        get() = definedExternally
+        set(value) = definedExternally
+    var folding: FoldingRules?
+        get() = definedExternally
+        set(value) = definedExternally
+}
+
+external interface IndentationRule {
+    var decreaseIndentPattern: RegExp
+    var increaseIndentPattern: RegExp
+    var indentNextLinePattern: RegExp?
+        get() = definedExternally
+        set(value) = definedExternally
+    var unIndentedLinePattern: RegExp?
+        get() = definedExternally
+        set(value) = definedExternally
+}
+
+external interface FoldingMarkers {
+    var start: RegExp
+    var end: RegExp
+}
+
+external interface FoldingRules {
+    var offSide: Boolean?
+        get() = definedExternally
+        set(value) = definedExternally
+    var markers: FoldingMarkers?
+        get() = definedExternally
+        set(value) = definedExternally
+}
+
+external interface OnEnterRule {
+    var beforeText: RegExp
+    var afterText: RegExp?
+        get() = definedExternally
+        set(value) = definedExternally
+    var oneLineAboveText: RegExp?
+        get() = definedExternally
+        set(value) = definedExternally
+    var action: EnterAction
+}
+
+external interface IDocComment {
+    var open: String
+    var close: String?
+        get() = definedExternally
+        set(value) = definedExternally
+}
+
+external interface IAutoClosingPair {
+    var open: String
+    var close: String
+}
+
+external interface IAutoClosingPairConditional : IAutoClosingPair {
+    var notIn: Array<String>?
+        get() = definedExternally
+        set(value) = definedExternally
+}
+
+external enum class IndentAction {
+    None /* = 0 */,
+    Indent /* = 1 */,
+    IndentOutdent /* = 2 */,
+    Outdent /* = 3 */
+}
+
+external interface EnterAction {
+    var indentAction: IndentAction
+    var appendText: String?
+        get() = definedExternally
+        set(value) = definedExternally
+    var removeText: Number?
+        get() = definedExternally
+        set(value) = definedExternally
+}
+
+external interface ILanguageExtensionPoint {
+    var id: String
+    var extensions: Array<String>?
+        get() = definedExternally
+        set(value) = definedExternally
+    var filenames: Array<String>?
+        get() = definedExternally
+        set(value) = definedExternally
+    var filenamePatterns: Array<String>?
+        get() = definedExternally
+        set(value) = definedExternally
+    var firstLine: String?
+        get() = definedExternally
+        set(value) = definedExternally
+    var aliases: Array<String>?
+        get() = definedExternally
+        set(value) = definedExternally
+    var mimetypes: Array<String>?
+        get() = definedExternally
+        set(value) = definedExternally
+    var configuration: Uri?
+        get() = definedExternally
+        set(value) = definedExternally
+}
+
+external interface IMonarchLanguageTokenizer
+
+external interface IMonarchLanguage {
+    var tokenizer: IMonarchLanguageTokenizer
+    var ignoreCase: Boolean?
+        get() = definedExternally
+        set(value) = definedExternally
+    var unicode: Boolean?
+        get() = definedExternally
+        set(value) = definedExternally
+    var defaultToken: String?
+        get() = definedExternally
+        set(value) = definedExternally
+    var brackets: Array<IMonarchLanguageBracket>?
+        get() = definedExternally
+        set(value) = definedExternally
+    var start: String?
+        get() = definedExternally
+        set(value) = definedExternally
+    var tokenPostfix: String?
+        get() = definedExternally
+        set(value) = definedExternally
+}
+
+external interface IExpandedMonarchLanguageRule {
+    var regex: RegExp
+    var action: IExpandedMonarchLanguageAction
+    var include: String
+}
+
+external interface IExpandedMonarchLanguageAction {
+    var group: Array<dynamic /* IShortMonarchLanguageAction | IExpandedMonarchLanguageAction | Array<IShortMonarchLanguageAction> | Array<IExpandedMonarchLanguageAction> */>?
+        get() = definedExternally
+        set(value) = definedExternally
+    var cases: Any?
+        get() = definedExternally
+        set(value) = definedExternally
+    var token: String?
+        get() = definedExternally
+        set(value) = definedExternally
+    var next: String?
+        get() = definedExternally
+        set(value) = definedExternally
+    var switchTo: String?
+        get() = definedExternally
+        set(value) = definedExternally
+    var goBack: Number?
+        get() = definedExternally
+        set(value) = definedExternally
+    var bracket: String?
+        get() = definedExternally
+        set(value) = definedExternally
+    var nextEmbedded: String?
+        get() = definedExternally
+        set(value) = definedExternally
+    var log: String?
+        get() = definedExternally
+        set(value) = definedExternally
+}
+
+external interface IMonarchLanguageBracket {
+    var open: String
+    var close: String
+    var token: String
+}

web/src/main/kotlin/world/phantasmal/web/externals/monacoEditor/languagesExtensions.kt

@@ -0,0 +1,10 @@
+package world.phantasmal.web.externals.monacoEditor
+
+typealias IMonarchLanguageRule = IExpandedMonarchLanguageRule
+
+inline operator fun IMonarchLanguageTokenizer.get(name: String): Array<IMonarchLanguageRule> =
+    asDynamic()[name].unsafeCast<Array<IMonarchLanguageRule>>()
+
+inline operator fun IMonarchLanguageTokenizer.set(name: String, value: Array<IMonarchLanguageRule>) {
+    asDynamic()[name] = value
+}

web/src/main/kotlin/world/phantasmal/web/externals/monacoEditor/monacoEditor.kt

@@ -0,0 +1,183 @@
+@file:JsModule("monaco-editor")
+@file:JsNonModule
+@file:Suppress("CovariantEquals", "unused")
+
+package world.phantasmal.web.externals.monacoEditor
+
+external interface IDisposable {
+    fun dispose()
+}
+
+external enum class MarkerTag {
+    Unnecessary /* = 1 */,
+    Deprecated /* = 2 */
+}
+
+external enum class MarkerSeverity {
+    Hint /* = 1 */,
+    Info /* = 2 */,
+    Warning /* = 4 */,
+    Error /* = 8 */
+}
+
+external interface IRange {
+    var startLineNumber: Number
+    var startColumn: Number
+    var endLineNumber: Number
+    var endColumn: Number
+}
+
+open external class Range(
+    startLineNumber: Number,
+    startColumn: Number,
+    endLineNumber: Number,
+    endColumn: Number,
+) {
+    open var startLineNumber: Number
+    open var startColumn: Number
+    open var endLineNumber: Number
+    open var endColumn: Number
+    open fun isEmpty(): Boolean
+    open fun containsPosition(position: IPosition): Boolean
+    open fun containsRange(range: IRange): Boolean
+    open fun strictContainsRange(range: IRange): Boolean
+    open fun plusRange(range: IRange): Range
+    open fun intersectRanges(range: IRange): Range?
+    open fun equalsRange(other: IRange?): Boolean
+    open fun getEndPosition(): Position
+    open fun getStartPosition(): Position
+    override fun toString(): String
+    open fun setEndPosition(endLineNumber: Number, endColumn: Number): Range
+    open fun setStartPosition(startLineNumber: Number, startColumn: Number): Range
+    open fun collapseToStart(): Range
+
+    companion object {
+        fun isEmpty(range: IRange): Boolean
+        fun containsPosition(range: IRange, position: IPosition): Boolean
+        fun containsRange(range: IRange, otherRange: IRange): Boolean
+        fun strictContainsRange(range: IRange, otherRange: IRange): Boolean
+        fun plusRange(a: IRange, b: IRange): Range
+        fun intersectRanges(a: IRange, b: IRange): Range?
+        fun equalsRange(a: IRange?, b: IRange?): Boolean
+        fun getEndPosition(range: IRange): Position
+        fun getStartPosition(range: IRange): Position
+        fun collapseToStart(range: IRange): Range
+        fun fromPositions(start: IPosition, end: IPosition = definedExternally): Range
+        fun lift(range: Nothing?): Nothing?
+        fun lift(range: IRange): Range
+        fun isIRange(obj: Any): Boolean
+        fun areIntersectingOrTouching(a: IRange, b: IRange): Boolean
+        fun areIntersecting(a: IRange, b: IRange): Boolean
+        fun compareRangesUsingStarts(a: IRange?, b: IRange?): Number
+        fun compareRangesUsingEnds(a: IRange, b: IRange): Number
+        fun spansMultipleLines(range: IRange): Boolean
+    }
+}
+
+external interface ISelection {
+    var selectionStartLineNumber: Number
+    var selectionStartColumn: Number
+    var positionLineNumber: Number
+    var positionColumn: Number
+}
+
+open external class Selection(
+    selectionStartLineNumber: Number,
+    selectionStartColumn: Number,
+    positionLineNumber: Number,
+    positionColumn: Number,
+) : Range {
+    open var selectionStartLineNumber: Number
+    open var selectionStartColumn: Number
+    open var positionLineNumber: Number
+    open var positionColumn: Number
+    override fun toString(): String
+    open fun equalsSelection(other: ISelection): Boolean
+    open fun getDirection(): SelectionDirection
+    override fun setEndPosition(endLineNumber: Number, endColumn: Number): Selection
+    open fun getPosition(): Position
+    override fun setStartPosition(startLineNumber: Number, startColumn: Number): Selection
+
+    companion object {
+        fun selectionsEqual(a: ISelection, b: ISelection): Boolean
+        fun fromPositions(start: IPosition, end: IPosition = definedExternally): Selection
+        fun liftSelection(sel: ISelection): Selection
+        fun selectionsArrEqual(a: Array<ISelection>, b: Array<ISelection>): Boolean
+        fun isISelection(obj: Any): Boolean
+        fun createWithDirection(
+            startLineNumber: Number,
+            startColumn: Number,
+            endLineNumber: Number,
+            endColumn: Number,
+            direction: SelectionDirection,
+        ): Selection
+    }
+}
+
+external enum class SelectionDirection {
+    LTR /* = 0 */,
+    RTL /* = 1 */
+}
+
+external interface IPosition {
+    var lineNumber: Number
+    var column: Number
+}
+
+open external class Position(lineNumber: Number, column: Number) {
+    open var lineNumber: Number
+    open var column: Number
+    open fun with(
+        newLineNumber: Number = definedExternally,
+        newColumn: Number = definedExternally,
+    ): Position
+
+    open fun delta(
+        deltaLineNumber: Number = definedExternally,
+        deltaColumn: Number = definedExternally,
+    ): Position
+
+    open fun equals(other: IPosition): Boolean
+    open fun isBefore(other: IPosition): Boolean
+    open fun isBeforeOrEqual(other: IPosition): Boolean
+    open fun clone(): Position
+    override fun toString(): String
+
+    companion object {
+        fun equals(a: IPosition?, b: IPosition?): Boolean
+        fun isBefore(a: IPosition, b: IPosition): Boolean
+        fun isBeforeOrEqual(a: IPosition, b: IPosition): Boolean
+        fun compare(a: IPosition, b: IPosition): Number
+        fun lift(pos: IPosition): Position
+        fun isIPosition(obj: Any): Boolean
+    }
+}
+
+external interface UriComponents {
+    var scheme: String
+    var authority: String
+    var path: String
+    var query: String
+    var fragment: String
+}
+
+open external class Uri : UriComponents {
+    override var scheme: String
+    override var authority: String
+    override var path: String
+    override var query: String
+    override var fragment: String
+    open fun toString(skipEncoding: Boolean = definedExternally): String
+    open fun toJSON(): UriComponents
+
+    companion object {
+        fun isUri(thing: Any): Boolean
+        fun parse(value: String, _strict: Boolean = definedExternally): Uri
+        fun file(path: String): Uri
+        fun joinPath(uri: Uri, vararg pathFragment: String): Uri
+        fun revive(data: UriComponents): Uri
+        fun revive(data: Uri): Uri
+        fun revive(data: UriComponents? = definedExternally): Uri?
+        fun revive(data: Uri? = definedExternally): Uri?
+    }
+}

web/src/main/kotlin/world/phantasmal/web/huntOptimizer/models/HuntMethodModel.kt

@@ -4,6 +4,7 @@ import world.phantasmal.lib.fileFormats.quest.Episode
 import world.phantasmal.lib.fileFormats.quest.NpcType
 import world.phantasmal.observable.value.Val
 import world.phantasmal.observable.value.mutableVal
+import world.phantasmal.observable.value.orElse
 import kotlin.time.Duration
 
 class HuntMethodModel(
@@ -26,7 +27,7 @@ class HuntMethodModel(
      */
     val userTime: Val<Duration?> = _userTime
 
-    val time: Val<Duration> = userTime.map { it ?: defaultTime }
+    val time: Val<Duration> = userTime.orElse { defaultTime }
 
     fun setUserTime(userTime: Duration?): HuntMethodModel {
         _userTime.value = userTime

web/src/main/kotlin/world/phantasmal/web/questEditor/QuestEditor.kt

@@ -8,6 +8,7 @@ import world.phantasmal.web.core.PwToolType
 import world.phantasmal.web.core.loading.AssetLoader
 import world.phantasmal.web.core.stores.UiStore
 import world.phantasmal.web.externals.babylon.Engine
+import world.phantasmal.web.questEditor.controllers.AssemblyEditorController
 import world.phantasmal.web.questEditor.controllers.NpcCountsController
 import world.phantasmal.web.questEditor.controllers.QuestEditorToolbarController
 import world.phantasmal.web.questEditor.controllers.QuestInfoController
@@ -18,6 +19,7 @@ import world.phantasmal.web.questEditor.rendering.QuestEditorMeshManager
 import world.phantasmal.web.questEditor.rendering.QuestRenderer
 import world.phantasmal.web.questEditor.rendering.UserInputManager
 import world.phantasmal.web.questEditor.stores.AreaStore
+import world.phantasmal.web.questEditor.stores.AssemblyEditorStore
 import world.phantasmal.web.questEditor.stores.QuestEditorStore
 import world.phantasmal.web.questEditor.widgets.*
 import world.phantasmal.webui.DisposableContainer
@@ -33,6 +35,7 @@ class QuestEditor(
     override fun initialize(scope: CoroutineScope): Widget {
         // Renderer
         val canvas = document.createElement("CANVAS") as HTMLCanvasElement
+        canvas.style.outline = "none"
         val renderer = addDisposable(QuestRenderer(canvas, createEngine(canvas)))
 
         // Asset Loaders
@@ -43,6 +46,7 @@ class QuestEditor(
         // Stores
         val areaStore = addDisposable(AreaStore(scope, areaAssetLoader))
         val questEditorStore = addDisposable(QuestEditorStore(scope, uiStore, areaStore))
+        val assemblyEditorStore = addDisposable(AssemblyEditorStore(scope, questEditorStore))
 
         // Controllers
         val toolbarController = addDisposable(QuestEditorToolbarController(
@@ -52,6 +56,7 @@ class QuestEditor(
         ))
         val questInfoController = addDisposable(QuestInfoController(questEditorStore))
         val npcCountsController = addDisposable(NpcCountsController(questEditorStore))
+        val assemblyEditorController = addDisposable(AssemblyEditorController(assemblyEditorStore))
 
         // Rendering
         addDisposables(
@@ -71,7 +76,8 @@ class QuestEditor(
             { s -> QuestEditorToolbarWidget(s, toolbarController) },
             { s -> QuestInfoWidget(s, questInfoController) },
             { s -> NpcCountsWidget(s, npcCountsController) },
-            { s -> QuestEditorRendererWidget(s, canvas, renderer) }
+            { s -> QuestEditorRendererWidget(s, canvas, renderer) },
+            { s -> AssemblyEditorWidget(s, assemblyEditorController) },
         )
     }
 }

web/src/main/kotlin/world/phantasmal/web/questEditor/assembly/AssemblyAnalyser.kt

@@ -0,0 +1,8 @@
+package world.phantasmal.web.questEditor.assembly
+
+import world.phantasmal.core.disposable.TrackedDisposable
+
+class AssemblyAnalyser : TrackedDisposable() {
+    fun setAssembly(assembly: List<String>) {
+    }
+}

web/src/main/kotlin/world/phantasmal/web/questEditor/controllers/AssemblyEditorController.kt

@@ -0,0 +1,17 @@
+package world.phantasmal.web.questEditor.controllers
+
+import world.phantasmal.observable.value.*
+import world.phantasmal.web.externals.monacoEditor.ITextModel
+import world.phantasmal.web.externals.monacoEditor.createModel
+import world.phantasmal.web.questEditor.stores.AssemblyEditorStore
+import world.phantasmal.webui.controllers.Controller
+
+class AssemblyEditorController(assemblyEditorStore: AssemblyEditorStore) : Controller() {
+    val textModel: Val<ITextModel> = assemblyEditorStore.textModel.orElse { EMPTY_MODEL }
+    val enabled: Val<Boolean> = assemblyEditorStore.editingEnabled
+    val readOnly: Val<Boolean> = enabled.not() or assemblyEditorStore.textModel.isNull()
+
+    companion object {
+        private val EMPTY_MODEL = createModel("", AssemblyEditorStore.ASM_LANG_ID)
+    }
+}

web/src/main/kotlin/world/phantasmal/web/questEditor/models/QuestModel.kt

@@ -1,5 +1,6 @@
 package world.phantasmal.web.questEditor.models
 
+import world.phantasmal.lib.assembly.Segment
 import world.phantasmal.lib.fileFormats.quest.Episode
 import world.phantasmal.observable.value.Val
 import world.phantasmal.observable.value.list.ListVal
@@ -16,6 +17,7 @@ class QuestModel(
     mapDesignations: Map<Int, Int>,
     npcs: MutableList<QuestNpcModel>,
     objects: MutableList<QuestObjectModel>,
+    val byteCodeIr: List<Segment>,
     getVariant: (Episode, areaId: Int, variantId: Int) -> AreaVariantModel?,
 ) {
     private val _id = mutableVal(0)

web/src/main/kotlin/world/phantasmal/web/questEditor/stores/AssemblyEditorStore.kt

@@ -0,0 +1,178 @@
+package world.phantasmal.web.questEditor.stores
+
+import kotlinx.coroutines.CoroutineScope
+import world.phantasmal.lib.assembly.disassemble
+import world.phantasmal.observable.value.Val
+import world.phantasmal.observable.value.trueVal
+import world.phantasmal.web.externals.monacoEditor.*
+import world.phantasmal.webui.obj
+import world.phantasmal.webui.stores.Store
+import kotlin.js.RegExp
+
+class AssemblyEditorStore(
+    scope: CoroutineScope,
+    questEditorStore: QuestEditorStore,
+) : Store(scope) {
+    private var _textModel: ITextModel? = null
+
+    val inlineStackArgs: Val<Boolean> = trueVal()
+
+    val textModel: Val<ITextModel?> =
+        questEditorStore.currentQuest.map(inlineStackArgs) { quest, inlineArgs ->
+            _textModel?.dispose()
+
+            _textModel =
+                if (quest == null) null
+                else {
+                    val assembly = disassemble(quest.byteCodeIr, inlineArgs)
+                    createModel(assembly.joinToString("\n"), ASM_LANG_ID)
+                }
+
+            _textModel
+        }
+
+    val editingEnabled: Val<Boolean> = questEditorStore.questEditingEnabled
+
+    companion object {
+        const val ASM_LANG_ID = "psoasm"
+
+        init {
+            register(obj { id = ASM_LANG_ID })
+
+            setMonarchTokensProvider(ASM_LANG_ID, obj {
+                defaultToken = "invalid"
+
+                tokenizer = obj {
+                    this["root"] = arrayOf(
+                        // Strings.
+                        obj {
+                            // Unterminated string.
+                            regex = RegExp('"' + """([^"\\]|\.)*$""")
+                            action = obj { token = "string.invalid" }
+                        },
+                        obj {
+                            regex = RegExp("\"")
+                            action = obj {
+                                token = "string.quote"
+                                bracket = "@open"
+                                next = "@string"
+                            }
+                        },
+
+                        // Registers.
+                        obj {
+                            regex = RegExp("""r\d+""")
+                            action = obj { token = "predefined" }
+                        },
+
+                        // Labels.
+                        obj {
+                            regex = RegExp("""[^\s]+:""")
+                            action = obj { token = "tag" }
+                        },
+
+                        // Numbers.
+                        obj {
+                            regex = RegExp("""0x[0-9a-fA-F]+""")
+                            action = obj { token = "number.hex" }
+                        },
+                        obj {
+                            regex = RegExp("""-?\d+(\.\d+)?(e-?\d+)?""")
+                            action = obj { token = "number.float" }
+                        },
+                        obj {
+                            regex = RegExp("""-?[0-9]+""")
+                            action = obj { token = "number" }
+                        },
+
+                        // Section markers.
+                        obj {
+                            regex = RegExp("""\.[^\s]+""")
+                            action = obj { token = "keyword" }
+                        },
+
+                        // Identifiers.
+                        obj {
+                            regex = RegExp("""[a-z][a-z0-9_=<>!]*""")
+                            action = obj { token = "identifier" }
+                        },
+
+                        // Whitespace.
+                        obj {
+                            regex = RegExp("""[ \t\r\n]+""")
+                            action = obj { token = "white" }
+                        },
+//                        obj {
+//                            regex = RegExp("""\/\*""")
+//                            action = obj { token = "comment"; next = "@comment" }
+//                        },
+                        obj {
+                            regex = RegExp("\\/\\/.*$")
+                            action = obj { token = "comment" }
+                        },
+
+                        // Delimiters.
+                        obj {
+                            regex = RegExp(",")
+                            action = obj { token = "delimiter" }
+                        },
+                    )
+
+//                    this["comment"] = arrayOf(
+//                        obj {
+//                            regex = RegExp("""[^/*]+""")
+//                            action = obj { token = "comment" }
+//                        },
+//                        obj {
+//                            // Nested comment.
+//                            regex = RegExp("""\/\*""")
+//                            action = obj { token = "comment"; next = "@push" }
+//                        },
+//                        obj {
+//                            // Nested comment end.
+//                            regex = RegExp("""\*/""")
+//                            action = obj { token = "comment"; next = "@pop" }
+//                        },
+//                        obj {
+//                            regex = RegExp("""[/*]""")
+//                            action = obj { token = "comment" }
+//                        },
+//                    )
+
+                    this["string"] = arrayOf(
+                        obj {
+                            regex = RegExp("""[^\\"]+""")
+                            action = obj { token = "string" }
+                        },
+                        obj {
+                            regex = RegExp("""\\(?:[n\\"])""")
+                            action = obj { token = "string.escape" }
+                        },
+                        obj {
+                            regex = RegExp("""\\.""")
+                            action = obj { token = "string.escape.invalid" }
+                        },
+                        obj {
+                            regex = RegExp("\"")
+                            action = obj {
+                                token = "string.quote"
+                                bracket = "@close"
+                                next = "@pop"
+                            }
+                        },
+                    )
+                }
+            })
+
+            setLanguageConfiguration(ASM_LANG_ID, obj {
+                indentationRules = obj<IndentationRule> {
+                    increaseIndentPattern = RegExp("^\\s*\\d+:")
+                    decreaseIndentPattern = RegExp("^\\s*(\\d+|\\.)")
+                }
+                autoClosingPairs = arrayOf(obj { open = "\""; close = "\"" })
+                surroundingPairs = arrayOf(obj { open = "\""; close = "\"" })
+                comments = obj<CommentRule> { lineComment = "//" }
+            })
+        }
+    }
+}

web/src/main/kotlin/world/phantasmal/web/questEditor/stores/ModelConversion.kt

@@ -22,6 +22,7 @@ fun convertQuestToModel(
         // TODO: Add WaveModel to QuestNpcModel
         quest.npcs.mapTo(mutableListOf()) { QuestNpcModel(it, null) },
         quest.objects.mapTo(mutableListOf()) { QuestObjectModel(it) },
+        quest.byteCodeIr,
         getVariant
     )
 }

web/src/main/kotlin/world/phantasmal/web/questEditor/widgets/AssemblyEditorWidget.kt

@@ -0,0 +1,70 @@
+package world.phantasmal.web.questEditor.widgets
+
+import kotlinx.coroutines.CoroutineScope
+import org.w3c.dom.Node
+import world.phantasmal.core.disposable.disposable
+import world.phantasmal.web.externals.monacoEditor.IStandaloneCodeEditor
+import world.phantasmal.web.externals.monacoEditor.create
+import world.phantasmal.web.externals.monacoEditor.defineTheme
+import world.phantasmal.web.externals.monacoEditor.set
+import world.phantasmal.web.questEditor.controllers.AssemblyEditorController
+import world.phantasmal.webui.dom.div
+import world.phantasmal.webui.obj
+import world.phantasmal.webui.widgets.Widget
+
+class AssemblyEditorWidget(
+    scope: CoroutineScope,
+    private val ctrl: AssemblyEditorController,
+) : Widget(scope) {
+    private lateinit var editor: IStandaloneCodeEditor
+
+    override fun Node.createElement() =
+        div {
+            editor = create(this, obj {
+                theme = "phantasmal-world"
+                scrollBeyondLastLine = false
+                autoIndent = "full"
+                fontSize = 13
+                wordWrap = "on"
+                wrappingIndent = "indent"
+                renderIndentGuides = false
+                folding = false
+            })
+
+            addDisposable(disposable { editor.dispose() })
+
+            observe(ctrl.textModel) { editor.setModel(it) }
+
+            observe(ctrl.readOnly) { editor.updateOptions(obj { readOnly = it }) }
+
+            addDisposable(size.observe { (size) ->
+                editor.layout(obj {
+                    width = size.width
+                    height = size.height
+                })
+            })
+        }
+
+    companion object {
+        init {
+            defineTheme("phantasmal-world", obj {
+                base = "vs-dark"
+                inherit = true
+                rules = arrayOf(
+                    obj { token = ""; foreground = "E0E0E0"; background = "#181818" },
+                    obj { token = "tag"; foreground = "99BBFF" },
+                    obj { token = "keyword"; foreground = "D0A0FF"; fontStyle = "bold" },
+                    obj { token = "predefined"; foreground = "BBFFBB" },
+                    obj { token = "number"; foreground = "FFFFAA" },
+                    obj { token = "number.hex"; foreground = "FFFFAA" },
+                    obj { token = "string"; foreground = "88FFFF" },
+                    obj { token = "string.escape"; foreground = "8888FF" },
+                )
+                colors = obj {
+                    this["editor.background"] = "#181818"
+                    this["editor.lineHighlightBackground"] = "#202020"
+                }
+            })
+        }
+    }
+}

web/src/main/kotlin/world/phantasmal/web/questEditor/widgets/QuestEditorWidget.kt

@@ -26,6 +26,7 @@ class QuestEditorWidget(
     private val createQuestInfoWidget: (CoroutineScope) -> Widget,
     private val createNpcCountsWidget: (CoroutineScope) -> Widget,
     private val createQuestRendererWidget: (CoroutineScope) -> Widget,
+    private val createAssemblyEditorWidget: (CoroutineScope) -> Widget,
 ) : Widget(scope) {
     override fun Node.createElement() =
         div {
@@ -60,7 +61,7 @@ class QuestEditorWidget(
                                 ),
                             )
                         ),
-                        DockedStack(
+                        DockedRow(
                             flex = 9,
                             items = listOf(
                                 DockedWidget(
@@ -71,7 +72,7 @@ class QuestEditorWidget(
                                 DockedWidget(
                                     title = "Script",
                                     id = "asm_editor",
-                                    createWidget = ::TestWidget
+                                    createWidget = createAssemblyEditorWidget
                                 ),
                             )
                         ),

web/src/test/kotlin/world/phantasmal/web/test/TestModels.kt

@@ -1,5 +1,6 @@
 package world.phantasmal.web.test
 
+import world.phantasmal.lib.assembly.Segment
 import world.phantasmal.lib.fileFormats.quest.Episode
 import world.phantasmal.lib.fileFormats.quest.NpcType
 import world.phantasmal.lib.fileFormats.quest.QuestNpc
@@ -15,6 +16,7 @@ fun createQuestModel(
     episode: Episode = Episode.I,
     npcs: List<QuestNpcModel> = emptyList(),
     objects: List<QuestObjectModel> = emptyList(),
+    byteCodeIr: List<Segment> = emptyList(),
 ): QuestModel =
     QuestModel(
         id,
@@ -26,6 +28,7 @@ fun createQuestModel(
         emptyMap(),
         npcs.toMutableList(),
         objects.toMutableList(),
+        byteCodeIr,
     ) { _, _, _ -> null }
 
 fun createQuestNpcModel(type: NpcType, episode: Episode): QuestNpcModel =

web/webpack.config.d/webpack.config.js

@@ -0,0 +1,4 @@
+config.module.rules.push({
+    test: /\.(gif|jpg|png|svg|ttf)$/,
+    loader: "file-loader",
+});

webui/src/main/kotlin/world/phantasmal/webui/Js.kt

@@ -1,4 +1,4 @@
 package world.phantasmal.webui
 
-fun <T> obj(block: T.() -> Unit): T =
+inline fun <T> obj(block: T.() -> Unit): T =
     js("{}").unsafeCast<T>().apply(block)

webui/src/main/kotlin/world/phantasmal/webui/dom/HTMLElementSizeVal.kt

@@ -0,0 +1,94 @@
+package world.phantasmal.webui.dom
+
+import org.w3c.dom.HTMLElement
+import world.phantasmal.core.disposable.Disposable
+import world.phantasmal.core.disposable.disposable
+import world.phantasmal.core.unsafeToNonNull
+import world.phantasmal.observable.Observer
+import world.phantasmal.observable.value.AbstractVal
+
+data class Size(val width: Double, val height: Double)
+
+class HTMLElementSizeVal(element: HTMLElement? = null) : AbstractVal<Size>() {
+    private var resizeObserver: dynamic = null
+
+    /**
+     * Set to true right before actual observers are added.
+     */
+    private var hasObservers = false
+
+    private var _value: Size? = null
+
+    var element: HTMLElement? = null
+        set(element) {
+            if (resizeObserver != null) {
+                if (field != null) {
+                    resizeObserver.unobserve(field)
+                }
+
+                if (element != null) {
+                    resizeObserver.observe(element)
+                }
+            }
+
+            field = element
+        }
+
+    init {
+        // Ensure we call the setter with element.
+        this.element = element
+    }
+
+    override val value: Size
+        get() {
+            if (!hasObservers) {
+                _value = getSize()
+            }
+
+            return _value.unsafeToNonNull()
+        }
+
+    override fun observe(callNow: Boolean, observer: Observer<Size>): Disposable {
+        if (!hasObservers) {
+            hasObservers = true
+
+            if (resizeObserver == null) {
+                @Suppress("UNUSED_VARIABLE")
+                val resize = ::resizeCallback
+                resizeObserver = js("new ResizeObserver(resize);")
+            }
+
+            if (element != null) {
+                resizeObserver.observe(element)
+            }
+
+            _value = getSize()
+        }
+
+        val superDisposable = super.observe(callNow, observer)
+
+        return disposable {
+            superDisposable.dispose()
+
+            if (observers.isEmpty()) {
+                hasObservers = false
+                resizeObserver.disconnect()
+            }
+        }
+    }
+
+    private fun getSize(): Size =
+        element
+            ?.let { Size(it.offsetWidth.toDouble(), it.offsetHeight.toDouble()) }
+            ?: Size(0.0, 0.0)
+
+    private fun resizeCallback(entries: Array<dynamic>) {
+        entries.forEach { entry ->
+            _value = Size(
+                entry.contentRect.width.unsafeCast<Double>(),
+                entry.contentRect.height.unsafeCast<Double>()
+            )
+            emit()
+        }
+    }
+}

webui/src/main/kotlin/world/phantasmal/webui/widgets/Widget.kt

@@ -3,12 +3,13 @@ package world.phantasmal.webui.widgets
 import kotlinx.browser.document
 import kotlinx.coroutines.CoroutineScope
 import org.w3c.dom.*
-import world.phantasmal.core.disposable.disposable
 import world.phantasmal.observable.Observable
 import world.phantasmal.observable.value.*
 import world.phantasmal.observable.value.list.ListVal
 import world.phantasmal.observable.value.list.ListValChangeEvent
 import world.phantasmal.webui.DisposableContainer
+import world.phantasmal.webui.dom.HTMLElementSizeVal
+import world.phantasmal.webui.dom.Size
 
 abstract class Widget(
     protected val scope: CoroutineScope,
@@ -25,8 +26,7 @@ abstract class Widget(
 ) : DisposableContainer() {
     private val _ancestorVisible = mutableVal(true)
     private val _children = mutableListOf<Widget>()
-    private var initResizeObserverRequested = false
+    private val _size = HTMLElementSizeVal()
-    private var resizeObserverInitialized = false
 
     private val elementDelegate = lazy {
         val el = document.createDocumentFragment().createElement()
@@ -54,9 +54,7 @@ abstract class Widget(
             }
         }
 
-        if (initResizeObserverRequested) {
+        _size.element = el
-            initResizeObserver(el)
-        }
 
         interceptElement(el)
         el
@@ -77,6 +75,8 @@ abstract class Widget(
      */
     val selfOrAncestorVisible: Val<Boolean> = visible and ancestorVisible
 
+    val size: Val<Size> = _size
+
     val children: List<Widget> = _children
 
     open fun focus() {
@@ -189,40 +189,6 @@ abstract class Widget(
         spliceChildren(0, 0, list.value)
     }
 
-    /**
-     * Called whenever [element] is resized.
-     * Must be initialized with [observeResize].
-     */
-    protected open fun resized(width: Double, height: Double) {}
-
-    protected fun observeResize() {
-        if (elementDelegate.isInitialized()) {
-            initResizeObserver(element)
-        } else {
-            initResizeObserverRequested = true
-        }
-    }
-
-    private fun initResizeObserver(element: Element) {
-        if (resizeObserverInitialized) return
-
-        resizeObserverInitialized = true
-        @Suppress("UNUSED_VARIABLE")
-        val resize = ::resizeCallback
-        val observer = js("new ResizeObserver(resize);")
-        observer.observe(element)
-        addDisposable(disposable { observer.disconnect().unsafeCast<Unit>() })
-    }
-
-    private fun resizeCallback(entries: Array<dynamic>) {
-        entries.forEach { entry ->
-            resized(
-                entry.contentRect.width.unsafeCast<Double>(),
-                entry.contentRect.height.unsafeCast<Double>()
-            )
-        }
-    }
-
     companion object {
         private val STYLE_EL by lazy {
             val el = document.createElement("style") as HTMLStyleElement