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@glimmer/runtime

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Minimal runtime needed to render Glimmer templates

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import { DEBUG } from '@glimmer/env'; import { updateRef, valueForRef } from '@glimmer/reference'; import { associateDestroyableChild, destroy, destroyChildren } from '@glimmer/destroyable'; import { Stack, logStep } from '@glimmer/util'; import { resetTracking, runInTrackingTransaction } from '@glimmer/validator'; import { clear, move as moveBounds } from '../bounds'; import { NewElementBuilder } from './element-builder'; export default class UpdatingVMImpl { constructor(env, { alwaysRevalidate = false }) { this.frameStack = new Stack(); this.env = env; this.dom = env.getDOM(); this.alwaysRevalidate = alwaysRevalidate; } execute(opcodes, handler) { if (DEBUG) { let hasErrored = true; try { runInTrackingTransaction(() => this._execute(opcodes, handler), '- While rendering:'); // using a boolean here to avoid breaking ergonomics of "pause on uncaught exceptions" // which would happen with a `catch` + `throw` hasErrored = false; } finally { if (hasErrored) { // eslint-disable-next-line no-console console.error(`\n\nError occurred:\n\n${resetTracking()}\n\n`); } } } else { this._execute(opcodes, handler); } } _execute(opcodes, handler) { let { frameStack } = this; this.try(opcodes, handler); while (true) { if (frameStack.isEmpty()) break; let opcode = this.frame.nextStatement(); if (opcode === undefined) { frameStack.pop(); continue; } opcode.evaluate(this); } } get frame() { return this.frameStack.current; } goto(index) { this.frame.goto(index); } try(ops, handler) { this.frameStack.push(new UpdatingVMFrame(ops, handler)); } throw() { this.frame.handleException(); this.frameStack.pop(); } } export class ResumableVMStateImpl { constructor(state, resumeCallback) { this.state = state; this.resumeCallback = resumeCallback; } resume(runtime, builder) { return this.resumeCallback(runtime, this.state, builder); } } export class BlockOpcode { constructor(state, runtime, bounds, children) { this.state = state; this.runtime = runtime; this.children = children; this.bounds = bounds; } parentElement() { return this.bounds.parentElement(); } firstNode() { return this.bounds.firstNode(); } lastNode() { return this.bounds.lastNode(); } evaluate(vm) { vm.try(this.children, null); } } export class TryOpcode extends BlockOpcode { constructor() { super(...arguments); this.type = 'try'; } evaluate(vm) { vm.try(this.children, this); } handleException() { let { state, bounds, runtime } = this; destroyChildren(this); let elementStack = NewElementBuilder.resume(runtime.env, bounds); let vm = state.resume(runtime, elementStack); let updating = []; let children = this.children = []; let result = vm.execute(vm => { vm.pushUpdating(updating); vm.updateWith(this); vm.pushUpdating(children); }); associateDestroyableChild(this, result.drop); } } export class ListItemOpcode extends TryOpcode { constructor(state, runtime, bounds, key, memo, value) { super(state, runtime, bounds, []); this.key = key; this.memo = memo; this.value = value; this.retained = false; this.index = -1; } updateReferences(item) { this.retained = true; updateRef(this.value, item.value); updateRef(this.memo, item.memo); } shouldRemove() { return !this.retained; } reset() { this.retained = false; } } export class ListBlockOpcode extends BlockOpcode { constructor(state, runtime, bounds, children, iterableRef) { super(state, runtime, bounds, children); this.iterableRef = iterableRef; this.type = 'list-block'; this.opcodeMap = new Map(); this.marker = null; this.lastIterator = valueForRef(iterableRef); } initializeChild(opcode) { opcode.index = this.children.length - 1; this.opcodeMap.set(opcode.key, opcode); } evaluate(vm) { let iterator = valueForRef(this.iterableRef); if (this.lastIterator !== iterator) { let { bounds } = this; let { dom } = vm; let marker = this.marker = dom.createComment(''); dom.insertAfter(bounds.parentElement(), marker, bounds.lastNode()); this.sync(iterator); this.parentElement().removeChild(marker); this.marker = null; this.lastIterator = iterator; } // Run now-updated updating opcodes super.evaluate(vm); } sync(iterator) { let { opcodeMap: itemMap, children } = this; let currentOpcodeIndex = 0; let seenIndex = 0; this.children = this.bounds.boundList = []; while (true) { let item = iterator.next(); if (item === null) break; let opcode = children[currentOpcodeIndex]; let { key } = item; // Items that have already been found and moved will already be retained, // we can continue until we find the next unretained item while (opcode !== undefined && opcode.retained === true) { opcode = children[++currentOpcodeIndex]; } if (opcode !== undefined && opcode.key === key) { this.retainItem(opcode, item); currentOpcodeIndex++; } else if (itemMap.has(key)) { let itemOpcode = itemMap.get(key); // The item opcode was seen already, so we should move it. if (itemOpcode.index < seenIndex) { this.moveItem(itemOpcode, item, opcode); } else { // Update the seen index, we are going to be moving this item around // so any other items that come before it will likely need to move as // well. seenIndex = itemOpcode.index; let seenUnretained = false; // iterate through all of the opcodes between the current position and // the position of the item's opcode, and determine if they are all // retained. for (let i = currentOpcodeIndex + 1; i < seenIndex; i++) { if (children[i].retained === false) { seenUnretained = true; break; } } // If we have seen only retained opcodes between this and the matching // opcode, it means that all the opcodes in between have been moved // already, and we can safely retain this item's opcode. if (seenUnretained === false) { this.retainItem(itemOpcode, item); currentOpcodeIndex = seenIndex + 1; } else { this.moveItem(itemOpcode, item, opcode); currentOpcodeIndex++; } } } else { this.insertItem(item, opcode); } } for (let i = 0; i < children.length; i++) { let opcode = children[i]; if (opcode.retained === false) { this.deleteItem(opcode); } else { opcode.reset(); } } } retainItem(opcode, item) { if (false /* LOCAL_DEBUG */ ) { logStep('list-updates', ['retain', item.key]); } let { children } = this; updateRef(opcode.memo, item.memo); updateRef(opcode.value, item.value); opcode.retained = true; opcode.index = children.length; children.push(opcode); } insertItem(item, before) { if (false /* LOCAL_DEBUG */ ) { logStep('list-updates', ['insert', item.key]); } let { opcodeMap, bounds, state, runtime, children } = this; let { key } = item; let nextSibling = before === undefined ? this.marker : before.firstNode(); let elementStack = NewElementBuilder.forInitialRender(runtime.env, { element: bounds.parentElement(), nextSibling }); let vm = state.resume(runtime, elementStack); vm.execute(vm => { vm.pushUpdating(); let opcode = vm.enterItem(item); opcode.index = children.length; children.push(opcode); opcodeMap.set(key, opcode); associateDestroyableChild(this, opcode); }); } moveItem(opcode, item, before) { let { children } = this; updateRef(opcode.memo, item.memo); updateRef(opcode.value, item.value); opcode.retained = true; let currentSibling, nextSibling; if (before === undefined) { moveBounds(opcode, this.marker); } else { currentSibling = opcode.lastNode().nextSibling; nextSibling = before.firstNode(); // Items are moved throughout the algorithm, so there are cases where the // the items already happen to be siblings (e.g. an item in between was // moved before this move happened). Check to see if they are siblings // first before doing the move. if (currentSibling !== nextSibling) { moveBounds(opcode, nextSibling); } } opcode.index = children.length; children.push(opcode); if (false /* LOCAL_DEBUG */ ) { let type = currentSibling && currentSibling === nextSibling ? 'move-retain' : 'move'; logStep('list-updates', [type, item.key]); } } deleteItem(opcode) { if (false /* LOCAL_DEBUG */ ) { logStep('list-updates', ['delete', opcode.key]); } destroy(opcode); clear(opcode); this.opcodeMap.delete(opcode.key); } } class UpdatingVMFrame { constructor(ops, exceptionHandler) { this.ops = ops; this.exceptionHandler = exceptionHandler; this.current = 0; } goto(index) { this.current = index; } nextStatement() { return this.ops[this.current++]; } handleException() { if (this.exceptionHandler) { this.exceptionHandler.handleException(); } } } //# 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{ DEBUG } from '@glimmer/env';\nimport {\n  Bounds,\n  DynamicScope,\n  ElementBuilder,\n  Environment,\n  ExceptionHandler,\n  GlimmerTreeChanges,\n  LiveBlock,\n  Option,\n  RuntimeContext,\n  Scope,\n  UpdatableBlock,\n  UpdatingVM,\n  UpdatingOpcode,\n} from '@glimmer/interfaces';\nimport { LOCAL_DEBUG } from '@glimmer/local-debug-flags';\nimport {\n  OpaqueIterationItem,\n  OpaqueIterator,\n  Reference,\n  updateRef,\n  valueForRef,\n} from '@glimmer/reference';\nimport { associateDestroyableChild, destroy, destroyChildren } from '@glimmer/destroyable';\nimport { expect, Stack, logStep } from '@glimmer/util';\nimport { resetTracking, runInTrackingTransaction } from '@glimmer/validator';\nimport { SimpleComment } from '@simple-dom/interface';\nimport { clear, move as moveBounds } from '../bounds';\nimport { InternalVM, VmInitCallback } from './append';\nimport { LiveBlockList, NewElementBuilder } from './element-builder';\n\nexport default class UpdatingVMImpl implements UpdatingVM {\n  public env: Environment;\n  public dom: GlimmerTreeChanges;\n  public alwaysRevalidate: boolean;\n\n  private frameStack: Stack<UpdatingVMFrame> = new Stack<UpdatingVMFrame>();\n\n  constructor(env: Environment, { alwaysRevalidate = false }) {\n    this.env = env;\n    this.dom = env.getDOM();\n    this.alwaysRevalidate = alwaysRevalidate;\n  }\n\n  execute(opcodes: UpdatingOpcode[], handler: ExceptionHandler) {\n    if (DEBUG) {\n      let hasErrored = true;\n      try {\n        runInTrackingTransaction!(() => this._execute(opcodes, handler), '- While rendering:');\n\n        // using a boolean here to avoid breaking ergonomics of \"pause on uncaught exceptions\"\n        // which would happen with a `catch` + `throw`\n        hasErrored = false;\n      } finally {\n        if (hasErrored) {\n          // eslint-disable-next-line no-console\n          console.error(`\\n\\nError occurred:\\n\\n${resetTracking()}\\n\\n`);\n        }\n      }\n    } else {\n      this._execute(opcodes, handler);\n    }\n  }\n\n  private _execute(opcodes: UpdatingOpcode[], handler: ExceptionHandler) {\n    let { frameStack } = this;\n\n    this.try(opcodes, handler);\n\n    while (true) {\n      if (frameStack.isEmpty()) break;\n\n      let opcode = this.frame.nextStatement();\n\n      if (opcode === undefined) {\n        frameStack.pop();\n        continue;\n      }\n\n      opcode.evaluate(this);\n    }\n  }\n\n  private get frame() {\n    return expect(this.frameStack.current, 'bug: expected a frame');\n  }\n\n  goto(index: number) {\n    this.frame.goto(index);\n  }\n\n  try(ops: UpdatingOpcode[], handler: Option<ExceptionHandler>) {\n    this.frameStack.push(new UpdatingVMFrame(ops, handler));\n  }\n\n  throw() {\n    this.frame.handleException();\n    this.frameStack.pop();\n  }\n}\n\nexport interface VMState {\n  readonly pc: number;\n  readonly scope: Scope;\n  readonly dynamicScope: DynamicScope;\n  readonly stack: unknown[];\n}\n\nexport interface ResumableVMState {\n  resume(runtime: RuntimeContext, builder: ElementBuilder): InternalVM;\n}\n\nexport class ResumableVMStateImpl implements ResumableVMState {\n  constructor(readonly state: VMState, private resumeCallback: VmInitCallback) {}\n\n  resume(runtime: RuntimeContext, builder: ElementBuilder): InternalVM {\n    return this.resumeCallback(runtime, this.state, builder);\n  }\n}\n\nexport abstract class BlockOpcode implements UpdatingOpcode, Bounds {\n  public children: UpdatingOpcode[];\n\n  protected readonly bounds: LiveBlock;\n\n  constructor(\n    protected state: ResumableVMState,\n    protected runtime: RuntimeContext,\n    bounds: LiveBlock,\n    children: UpdatingOpcode[]\n  ) {\n    this.children = children;\n    this.bounds = bounds;\n  }\n\n  parentElement() {\n    return this.bounds.parentElement();\n  }\n\n  firstNode() {\n    return this.bounds.firstNode();\n  }\n\n  lastNode() {\n    return this.bounds.lastNode();\n  }\n\n  evaluate(vm: UpdatingVMImpl) {\n    vm.try(this.children, null);\n  }\n}\n\nexport class TryOpcode extends BlockOpcode implements ExceptionHandler {\n  public type = 'try';\n\n  protected bounds!: UpdatableBlock; // Hides property on base class\n\n  evaluate(vm: UpdatingVMImpl) {\n    vm.try(this.children, this);\n  }\n\n  handleException() {\n    let { state, bounds, runtime } = this;\n\n    destroyChildren(this);\n\n    let elementStack = NewElementBuilder.resume(runtime.env, bounds);\n    let vm = state.resume(runtime, elementStack);\n\n    let updating: UpdatingOpcode[] = [];\n    let children = (this.children = []);\n\n    let result = vm.execute((vm) => {\n      vm.pushUpdating(updating);\n      vm.updateWith(this);\n      vm.pushUpdating(children);\n    });\n\n    associateDestroyableChild(this, result.drop);\n  }\n}\n\nexport class ListItemOpcode extends TryOpcode {\n  public retained = false;\n  public index = -1;\n\n  constructor(\n    state: ResumableVMState,\n    runtime: RuntimeContext,\n    bounds: UpdatableBlock,\n    public key: unknown,\n    public memo: Reference,\n    public value: Reference\n  ) {\n    super(state, runtime, bounds, []);\n  }\n\n  updateReferences(item: OpaqueIterationItem) {\n    this.retained = true;\n    updateRef(this.value, item.value);\n    updateRef(this.memo, item.memo);\n  }\n\n  shouldRemove(): boolean {\n    return !this.retained;\n  }\n\n  reset() {\n    this.retained = false;\n  }\n}\n\nexport class ListBlockOpcode extends BlockOpcode {\n  public type = 'list-block';\n  public children!: ListItemOpcode[];\n\n  private opcodeMap = new Map<unknown, ListItemOpcode>();\n  private marker: SimpleComment | null = null;\n  private lastIterator: OpaqueIterator;\n\n  protected readonly bounds!: LiveBlockList;\n\n  constructor(\n    state: ResumableVMState,\n    runtime: RuntimeContext,\n    bounds: LiveBlockList,\n    children: ListItemOpcode[],\n    private iterableRef: Reference<OpaqueIterator>\n  ) {\n    super(state, runtime, bounds, children);\n    this.lastIterator = valueForRef(iterableRef);\n  }\n\n  initializeChild(opcode: ListItemOpcode) {\n    opcode.index = this.children.length - 1;\n    this.opcodeMap.set(opcode.key, opcode);\n  }\n\n  evaluate(vm: UpdatingVMImpl) {\n    let iterator = valueForRef(this.iterableRef);\n\n    if (this.lastIterator !== iterator) {\n      let { bounds } = this;\n      let { dom } = vm;\n\n      let marker = (this.marker = dom.createComment(''));\n      dom.insertAfter(\n        bounds.parentElement(),\n        marker,\n        expect(bounds.lastNode(), \"can't insert after an empty bounds\")\n      );\n\n      this.sync(iterator);\n\n      this.parentElement().removeChild(marker);\n      this.marker = null;\n      this.lastIterator = iterator;\n    }\n\n    // Run now-updated updating opcodes\n    super.evaluate(vm);\n  }\n\n  private sync(iterator: OpaqueIterator) {\n    let { opcodeMap: itemMap, children } = this;\n\n    let currentOpcodeIndex = 0;\n    let seenIndex = 0;\n\n    this.children = this.bounds.boundList = [];\n\n    while (true) {\n      let item = iterator.next();\n\n      if (item === null) break;\n\n      let opcode = children[currentOpcodeIndex];\n      let { key } = item;\n\n      // Items that have already been found and moved will already be retained,\n      // we can continue until we find the next unretained item\n      while (opcode !== undefined && opcode.retained === true) {\n        opcode = children[++currentOpcodeIndex];\n      }\n\n      if (opcode !== undefined && opcode.key === key) {\n        this.retainItem(opcode, item);\n        currentOpcodeIndex++;\n      } else if (itemMap.has(key)) {\n        let itemOpcode = itemMap.get(key)!;\n\n        // The item opcode was seen already, so we should move it.\n        if (itemOpcode.index < seenIndex) {\n          this.moveItem(itemOpcode, item, opcode);\n        } else {\n          // Update the seen index, we are going to be moving this item around\n          // so any other items that come before it will likely need to move as\n          // well.\n          seenIndex = itemOpcode.index;\n\n          let seenUnretained = false;\n\n          // iterate through all of the opcodes between the current position and\n          // the position of the item's opcode, and determine if they are all\n          // retained.\n          for (let i = currentOpcodeIndex + 1; i < seenIndex; i++) {\n            if (children[i].retained === false) {\n              seenUnretained = true;\n              break;\n            }\n          }\n\n          // If we have seen only retained opcodes between this and the matching\n          // opcode, it means that all the opcodes in between have been moved\n          // already, and we can safely retain this item's opcode.\n          if (seenUnretained === false) {\n            this.retainItem(itemOpcode, item);\n            currentOpcodeIndex = seenIndex + 1;\n          } else {\n            this.moveItem(itemOpcode, item, opcode);\n            currentOpcodeIndex++;\n          }\n        }\n      } else {\n        this.insertItem(item, opcode);\n      }\n    }\n\n    for (let i = 0; i < children.length; i++) {\n      let opcode = children[i];\n\n      if (opcode.retained === false) {\n        this.deleteItem(opcode);\n      } else {\n        opcode.reset();\n      }\n    }\n  }\n\n  private retainItem(opcode: ListItemOpcode, item: OpaqueIterationItem) {\n    if (LOCAL_DEBUG) {\n      logStep!('list-updates', ['retain', item.key]);\n    }\n\n    let { children } = this;\n\n    updateRef(opcode.memo, item.memo);\n    updateRef(opcode.value, item.value);\n    opcode.retained = true;\n\n    opcode.index = children.length;\n    children.push(opcode);\n  }\n\n  private insertItem(item: OpaqueIterationItem, before: ListItemOpcode) {\n    if (LOCAL_DEBUG) {\n      logStep!('list-updates', ['insert', item.key]);\n    }\n\n    let { opcodeMap, bounds, state, runtime, children } = this;\n    let { key } = item;\n    let nextSibling = before === undefined ? this.marker : before.firstNode();\n\n    let elementStack = NewElementBuilder.forInitialRender(runtime.env, {\n      element: bounds.parentElement(),\n      nextSibling,\n    });\n\n    let vm = state.resume(runtime, elementStack);\n\n    vm.execute((vm) => {\n      vm.pushUpdating();\n      let opcode = vm.enterItem(item);\n\n      opcode.index = children.length;\n      children.push(opcode);\n      opcodeMap.set(key, opcode);\n      associateDestroyableChild(this, opcode);\n    });\n  }\n\n  private moveItem(opcode: ListItemOpcode, item: OpaqueIterationItem, before: ListItemOpcode) {\n    let { children } = this;\n\n    updateRef(opcode.memo, item.memo);\n    updateRef(opcode.value, item.value);\n    opcode.retained = true;\n\n    let currentSibling, nextSibling;\n\n    if (before === undefined) {\n      moveBounds(opcode, this.marker);\n    } else {\n      currentSibling = opcode.lastNode().nextSibling;\n      nextSibling = before.firstNode();\n\n      // Items are moved throughout the algorithm, so there are cases where the\n      // the items already happen to be siblings (e.g. an item in between was\n      // moved before this move happened). Check to see if they are siblings\n      // first before doing the move.\n      if (currentSibling !== nextSibling) {\n        moveBounds(opcode, nextSibling);\n      }\n    }\n\n    opcode.index = children.length;\n    children.push(opcode);\n\n    if (LOCAL_DEBUG) {\n      let type = currentSibling && currentSibling === nextSibling ? 'move-retain' : 'move';\n      logStep!('list-updates', [type, item.key]);\n    }\n  }\n\n  private deleteItem(opcode: ListItemOpcode) {\n    if (LOCAL_DEBUG) {\n      logStep!('list-updates', ['delete', opcode.key]);\n    }\n\n    destroy(opcode);\n    clear(opcode);\n    this.opcodeMap.delete(opcode.key);\n  }\n}\n\nclass UpdatingVMFrame {\n  private current = 0;\n\n  constructor(private ops: UpdatingOpcode[], private exceptionHandler: Option<ExceptionHandler>) {}\n\n  goto(index: number) {\n    this.current = index;\n  }\n\n  nextStatement(): UpdatingOpcode | undefined {\n    return this.ops[this.current++];\n  }\n\n  handleException() {\n    if (this.exceptionHandler) {\n      this.exceptionHandler.handleException();\n    }\n  }\n}\n"],"sourceRoot":""}