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@tripsnek/tmf

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TypeScript Modeling Framework - A TypeScript port of the Eclipse Modeling Framework (EMF)

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/** * Default implementation for all TMF Lists, and hence all * multi-valued fields. * * This implementation wraps around a simple Javascript Array. */ export class BasicEList { //set when the list belongs to an EObject owner; eFeatureId; //set when a feature on objects in the list points back to the list owningEObject inverseEFeatureID; //the underlying array containing all List elements _elements = []; constructor(elems, owner, featID, inverseFeatID) { this.owner = owner; this.eFeatureId = featID; this.inverseEFeatureID = inverseFeatID; if (elems) this._elements = [...elems]; } add(item, index) { //if there is an inverse reference (container or eopposite), the list must be unique if (!this.hasInverseFeature() || !this.contains(item)) { this.basicAdd(item, index); if (this.hasInverseFeature()) { this.inverseAdd(item); } } } //should only be used for new objects with no existing container (optimization) //may provide modest performance boost in certain cases fastContainmentAddHack(item) { this._elements.push(item); item['_eContainer'] = this.owner; item['_eContainingFeature'] = this.eFeatureId; } basicAdd(item, index) { if (!index && index !== 0) this._elements.push(item); else this._elements.splice(index, 0, item); } inverseAdd(item) { //handle containment inverse references (TODO: Should this be handled by the item's eInverseAdd?) if (this.isContainment()) { item.setEContainer(this.owner, this.eFeatureId); } //handle inverse references (which may also be explicit references to the container) if (this.inverseEFeatureID) { //Remove from existing EOpposite, if it is single-valued (many-many eopposites do not need to be removed) const inverseFeature = item .eClass() .getEStructuralFeature(this.inverseEFeatureID); if (!inverseFeature?.isMany()) { const curOpposite = item.eGet(inverseFeature); if (curOpposite) { curOpposite.eInverseRemove(item, this.eFeatureId); } } item.eInverseAdd(this.owner, this.inverseEFeatureID); } } remove(item) { if (item) { //remove item from the array const removed = this.basicRemove(item); //only proceed with inverse removal if removal was successful if (removed && this.hasInverseFeature()) { this.inverseRemove(item); } } } basicRemove(item) { let removed = false; this._elements.forEach((arrItem, index) => { if (item === arrItem) { this._elements.splice(index, 1); removed = true; } }); return removed; } inverseRemove(item) { //only directly set container to null if there is no inverse feature if (this.isContainment() && !this.inverseEFeatureID) { item.setEContainer(undefined, undefined); } //otherwise, do an inverse remove on the field (whether it is a container or not) else { item.eInverseRemove(this.owner, this.inverseEFeatureID); } } containsAll(c) { throw new Error('Method not implemented.'); } addAll(list) { if (Array.isArray(list)) { for (let i = 0; i < list.length; i++) { this.add(list[i]); } } else { // For other iterables, convert to array first const items = Array.from(list); for (let i = 0; i < items.length; i++) { this.add(items[i]); } } } equals(o) { throw new Error('Method not implemented.'); } size() { return this._elements.length; } isEmpty() { return this._elements.length === 0; } contains(o) { for (const obj of this._elements) { if (o === obj) return true; } return false; } get(index) { return this._elements[index]; } set(index, element) { if (!this.hasInverseFeature() && !this.isContainment()) { this._elements[index] = element; return element; } //TODO: This method MUST handle inverse references else { throw new Error('BasicEList.set(index,element) not implemented for EReferences with containment or inverses.'); } } /** * Indicate whether this list represents a containment relationship * between the list owningEObject and the list contents. */ isContainment() { if (!this.eFeatureId || !this.owner) return false; else { const feature = this.owner .eClass() .getEStructuralFeature(this.eFeatureId); if (!feature) { return false; } //return feature instanceof EReferenceImpl && feature.isContainment(); return feature.isContainment(); } } indexOf(o) { let idx = 0; for (const element of this._elements) { if (element === o) return idx; idx++; } return -1; } lastIndexOf(o) { throw new Error('Method not implemented.'); } removeAll(list) { const startSize = this.size(); if (Array.isArray(list)) { for (let i = 0; i < list.length; i++) { this.remove(list[i]); } } else { // For other iterables, convert to array first const items = Array.from(list); for (let i = 0; i < items.length; i++) { this.remove(items[i]); } } return startSize !== this.size(); } clear() { this.removeAll(Object.assign([], this._elements)); } //implementation of Iterable interface - simply returns the iterator for the wrapped array [Symbol.iterator]() { return this._elements[Symbol.iterator](); } /** * Indicates whether objects in the list have a feature which refers * back to this list's owningEObject. */ hasInverseFeature() { if (this.inverseEFeatureID || this.isContainment()) return true; return false; } //====================================================================== // TMF-specific methods (to work better with TypeScript) /** * Swaps the elements at the given positions, if they exist. * @param idx1 * @param idx2 */ swap(idx1, idx2) { if (this._elements.length > idx1 && this._elements.length > idx2) { const temp = this._elements[idx1]; this._elements[idx1] = this._elements[idx2]; this._elements[idx2] = temp; } } /** * Returns a new native TypeScript Array of the EList's elements */ elements() { const size = this.size(); const result = new Array(size); for (let i = 0; i < size; i++) { result[i] = this.get(i); } return result; } filter(predicate, thisArg) { const result = new BasicEList(); for (const element of this._elements.filter(predicate)) { result.add(element); } return result; } forEach(callbackfn, thisArg) { return this._elements.forEach(callbackfn, thisArg); } find(predicate, thisArg) { return this._elements.find(predicate); } some(arg0) { return this._elements.some(arg0); } map(func, thisArg) { const result = new BasicEList(); for (const element of this._elements.map(func)) { result.add(element); } return result; } last() { if (this._elements.length == 0) return undefined; return this._elements.slice(-1)[0]; } /** * Removes the last element of the List and returns it. */ pop() { if (this.size() === 0) return undefined; const popped = this.get(this.size() - 1); this.remove(popped); return popped; } } //# 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{ EList } from './api/elist.js';\r\nimport { EObject } from './api/eobject.js';\r\n\r\n/**\r\n * Default implementation for all TMF Lists, and hence all\r\n * multi-valued fields.\r\n *\r\n * This implementation wraps around a simple Javascript Array.\r\n */\r\nexport class BasicEList<T> implements EList<T> {\r\n  //set when the list belongs to an EObject\r\n  private owner!: EObject;\r\n  private eFeatureId: number;\r\n\r\n  //set when a feature on objects in the list points back to the list owningEObject\r\n  private inverseEFeatureID: number;\r\n\r\n  //the underlying array containing all List elements\r\n  private _elements: T[] = [];\r\n\r\n  constructor(\r\n    elems?: T[],\r\n    owner?: EObject,\r\n    featID?: number,\r\n    inverseFeatID?: number\r\n  ) {\r\n    this.owner = owner!;\r\n    this.eFeatureId = featID!;\r\n    this.inverseEFeatureID = inverseFeatID!;\r\n    if (elems) this._elements = [...elems];\r\n  }\r\n\r\n  public add(item: T, index?: number): void {\r\n    //if there is an inverse reference (container or eopposite), the list must be unique\r\n    if (!this.hasInverseFeature() || !this.contains(item)) {\r\n      this.basicAdd(item, index);\r\n      if (this.hasInverseFeature()) {\r\n        this.inverseAdd(<EObject>(<unknown>item));\r\n      }\r\n    }\r\n  }\r\n\r\n  //should only be used for new objects with no existing container (optimization)\r\n  //may provide modest performance boost in certain cases\r\n  public fastContainmentAddHack(item: T): void {\r\n    this._elements.push(item);\r\n    (item as any)['_eContainer'] = this.owner;\r\n    (item as any)['_eContainingFeature'] = this.eFeatureId;\r\n  }\r\n\r\n  public basicAdd(item: T, index?: number): void {\r\n    if (!index && index !== 0) this._elements.push(item);\r\n    else this._elements.splice(index, 0, item);\r\n  }\r\n\r\n  private inverseAdd(item: EObject): void {\r\n    //handle containment inverse references (TODO: Should this be handled by the item's eInverseAdd?)\r\n    if (this.isContainment()) {\r\n      item.setEContainer(this.owner, this.eFeatureId);\r\n    }\r\n    //handle inverse references (which may also be explicit references to the container)\r\n    if (this.inverseEFeatureID) {\r\n      //Remove from existing EOpposite, if it is single-valued (many-many eopposites do not need to be removed)\r\n      const inverseFeature = item\r\n        .eClass()\r\n        .getEStructuralFeature(this.inverseEFeatureID);\r\n      if (!inverseFeature?.isMany()) {\r\n        const curOpposite = item.eGet(inverseFeature!);\r\n        if (curOpposite) {\r\n          curOpposite.eInverseRemove(item, this.eFeatureId);\r\n        }\r\n      }\r\n      item.eInverseAdd(this.owner, this.inverseEFeatureID);\r\n    }\r\n  }\r\n\r\n  public remove(item?: T) {\r\n    if (item) {\r\n      //remove item from the array\r\n      const removed = this.basicRemove(item);\r\n      //only proceed with inverse removal if removal was successful\r\n      if (removed && this.hasInverseFeature()) {\r\n        this.inverseRemove(<EObject>(<unknown>item));\r\n      }\r\n    }\r\n  }\r\n\r\n  public basicRemove(item: T) {\r\n    let removed = false;\r\n    this._elements.forEach((arrItem, index) => {\r\n      if (item === arrItem) {\r\n        this._elements.splice(index, 1);\r\n        removed = true;\r\n      }\r\n    });\r\n    return removed;\r\n  }\r\n\r\n  private inverseRemove(item: EObject): void {\r\n    //only directly set container to null if there is no inverse feature\r\n    if (this.isContainment() && !this.inverseEFeatureID) {\r\n      item.setEContainer(undefined, undefined);\r\n    }\r\n    //otherwise, do an inverse remove on the field (whether it is a container or not)\r\n    else {\r\n      item.eInverseRemove(this.owner, this.inverseEFeatureID);\r\n    }\r\n  }\r\n\r\n  public containsAll(c: EList<any>): boolean {\r\n    throw new Error('Method not implemented.');\r\n  }\r\n\r\n  public addAll(list: Iterable<T>) {\r\n    if (Array.isArray(list)) {\r\n      for (let i = 0; i < list.length; i++) {\r\n        this.add(list[i]);\r\n      }\r\n    } else {\r\n      // For other iterables, convert to array first\r\n      const items = Array.from(list);\r\n      for (let i = 0; i < items.length; i++) {\r\n        this.add(items[i] as T);\r\n      }\r\n    }\r\n  }\r\n\r\n  public equals(o: Object): boolean {\r\n    throw new Error('Method not implemented.');\r\n  }\r\n\r\n  public size(): number {\r\n    return this._elements.length;\r\n  }\r\n  public isEmpty(): boolean {\r\n    return this._elements.length === 0;\r\n  }\r\n  public contains(o: T): boolean {\r\n    for (const obj of this._elements) {\r\n      if (o === obj) return true;\r\n    }\r\n    return false;\r\n  }\r\n\r\n  public get(index: number): T {\r\n    return this._elements[index] as T;\r\n  }\r\n\r\n  public set(index: number, element: T): T {\r\n    if (!this.hasInverseFeature() && !this.isContainment()) {\r\n      this._elements[index] = element;\r\n      return element;\r\n    }\r\n    //TODO: This method MUST handle inverse references\r\n    else {\r\n      throw new Error(\r\n        'BasicEList.set(index,element) not implemented for EReferences with containment or inverses.'\r\n      );\r\n    }\r\n  }\r\n\r\n  /**\r\n   * Indicate whether this list represents a containment relationship\r\n   * between the list owningEObject and the list contents.\r\n   */\r\n  private isContainment(): boolean {\r\n    if (!this.eFeatureId || !this.owner) return false;\r\n    else {\r\n      const feature = this.owner\r\n        .eClass()\r\n        .getEStructuralFeature(this.eFeatureId);\r\n      if (!feature) {\r\n        return false;\r\n      }\r\n      //return feature instanceof EReferenceImpl && feature.isContainment();\r\n      return feature.isContainment();\r\n    }\r\n  }\r\n\r\n  public indexOf(o: T): number {\r\n    let idx = 0;\r\n    for (const element of this._elements) {\r\n      if (element === o) return idx;\r\n      idx++;\r\n    }\r\n    return -1;\r\n  }\r\n\r\n  public lastIndexOf(o: Object): number {\r\n    throw new Error('Method not implemented.');\r\n  }\r\n\r\n  public removeAll(list: Iterable<T>): boolean {\r\n    const startSize = this.size();\r\n    if (Array.isArray(list)) {\r\n      for (let i = 0; i < list.length; i++) {\r\n        this.remove(list[i]);\r\n      }\r\n    } else {\r\n      // For other iterables, convert to array first\r\n      const items = Array.from(list);\r\n      for (let i = 0; i < items.length; i++) {\r\n        this.remove(items[i]);\r\n      }\r\n    }\r\n    return startSize !== this.size();\r\n  }\r\n\r\n  public clear() {\r\n    this.removeAll(Object.assign([], this._elements));\r\n  }\r\n\r\n  //implementation of Iterable interface - simply returns the iterator for the wrapped array\r\n  [Symbol.iterator](): Iterator<T> {\r\n    return this._elements[Symbol.iterator]();\r\n  }\r\n\r\n  /**\r\n   * Indicates whether objects in the list have a feature which refers\r\n   * back to this list's owningEObject.\r\n   */\r\n  private hasInverseFeature(): boolean {\r\n    if (this.inverseEFeatureID || this.isContainment()) return true;\r\n    return false;\r\n  }\r\n\r\n  //======================================================================\r\n  // TMF-specific methods (to work better with TypeScript)\r\n\r\n  /**\r\n   * Swaps the elements at the given positions, if they exist.\r\n   * @param idx1\r\n   * @param idx2\r\n   */\r\n  public swap(idx1: number, idx2: number) {\r\n    if (this._elements.length > idx1 && this._elements.length > idx2) {\r\n      const temp = this._elements[idx1];\r\n      this._elements[idx1] = this._elements[idx2] as T;\r\n      this._elements[idx2] = temp as T;\r\n    }\r\n  }\r\n\r\n  /**\r\n   * Returns a new native TypeScript Array of the EList's elements\r\n   */\r\n  public elements(): T[] {\r\n    const size = this.size();\r\n    const result = new Array<T>(size);\r\n    for (let i = 0; i < size; i++) {\r\n      result[i] = this.get(i);\r\n    }\r\n    return result;\r\n  }\r\n\r\n  public filter(\r\n    predicate: (value: T, index: number, obj: T[]) => boolean,\r\n    thisArg?: any\r\n  ): EList<T> {\r\n    const result = new BasicEList<T>();\r\n    for (const element of this._elements.filter(predicate)) {\r\n      result.add(element);\r\n    }\r\n    return result;\r\n  }\r\n\r\n  public forEach(\r\n    callbackfn: (value: T, index: number, array: T[]) => void,\r\n    thisArg?: any\r\n  ): void {\r\n    return this._elements.forEach(callbackfn, thisArg);\r\n  }\r\n\r\n  public find(\r\n    predicate: (value: T, index: number, obj: T[]) => unknown,\r\n    thisArg?: any\r\n  ): T | undefined{\r\n    return this._elements.find(predicate);\r\n  }\r\n\r\n  public some(arg0: (e: any) => boolean): boolean {\r\n    return this._elements.some(arg0);\r\n  }\r\n\r\n  public map(\r\n    func: (value: T, index: number, obj: T[]) => any,\r\n    thisArg?: any\r\n  ): EList<any> {\r\n    const result = new BasicEList<T>();\r\n    for (const element of this._elements.map(func)) {\r\n      result.add(element);\r\n    }\r\n    return result;\r\n  }\r\n\r\n  public last(): T | undefined {\r\n    if (this._elements.length == 0) return undefined;\r\n    return this._elements.slice(-1)[0] as T;\r\n  }\r\n\r\n  /**\r\n   * Removes the last element of the List and returns it.\r\n   */\r\n  public pop(): T | undefined {\r\n    if (this.size() === 0) return undefined;\r\n    const popped = this.get(this.size() - 1);\r\n    this.remove(popped);\r\n    return popped;\r\n  }\r\n}\r\n"]}