@ngrx/schematics/schematics-core/utility/change.js.map

NgRx Schematics for Angular

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All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\nexport interface Host {\n  write(path: string, content: string): Promise<void>;\n  read(path: string): Promise<string>;\n}\n\nexport interface Change {\n  apply(host: Host): Promise<void>;\n\n  // The file this change should be applied to. Some changes might not apply to\n  // a file (maybe the config).\n  readonly path: string | null;\n\n  // The order this change should be applied. Normally the position inside the file.\n  // Changes are applied from the bottom of a file to the top.\n  readonly order: number;\n\n  // The description of this change. This will be outputted in a dry or verbose run.\n  readonly description: string;\n}\n\n/**\n * An operation that does nothing.\n */\nexport class NoopChange implements Change {\n  description = 'No operation.';\n  order = Infinity;\n  path = null;\n  apply() {\n    return Promise.resolve();\n  }\n}\n\n/**\n * Will add text to the source code.\n */\nexport class InsertChange implements Change {\n  order: number;\n  description: string;\n\n  constructor(\n    public path: string,\n    public pos: number,\n    public toAdd: string\n  ) {\n    if (pos < 0) {\n      throw new Error('Negative positions are invalid');\n    }\n    this.description = `Inserted ${toAdd} into position ${pos} of ${path}`;\n    this.order = pos;\n  }\n\n  /**\n   * This method does not insert spaces if there is none in the original string.\n   */\n  apply(host: Host) {\n    return host.read(this.path).then((content) => {\n      const prefix = content.substring(0, this.pos);\n      const suffix = content.substring(this.pos);\n\n      return host.write(this.path, `${prefix}${this.toAdd}${suffix}`);\n    });\n  }\n}\n\n/**\n * Will remove text from the source code.\n */\nexport class RemoveChange implements Change {\n  order: number;\n  description: string;\n\n  constructor(\n    public path: string,\n    public pos: number,\n    public end: number\n  ) {\n    if (pos < 0 || end < 0) {\n      throw new Error('Negative positions are invalid');\n    }\n    this.description = `Removed text in position ${pos} to ${end} of ${path}`;\n    this.order = pos;\n  }\n\n  apply(host: Host): Promise<void> {\n    return host.read(this.path).then((content) => {\n      const prefix = content.substring(0, this.pos);\n      const suffix = content.substring(this.end);\n\n      // TODO: throw error if toRemove doesn't match removed string.\n      return host.write(this.path, `${prefix}${suffix}`);\n    });\n  }\n}\n\n/**\n * Will replace text from the source code.\n */\nexport class ReplaceChange implements Change {\n  order: number;\n  description: string;\n\n  constructor(\n    public path: string,\n    public pos: number,\n    public oldText: string,\n    public newText: string\n  ) {\n    if (pos < 0) {\n      throw new Error('Negative positions are invalid');\n    }\n    this.description = `Replaced ${oldText} into position ${pos} of ${path} with ${newText}`;\n    this.order = pos;\n  }\n\n  apply(host: Host): Promise<void> {\n    return host.read(this.path).then((content) => {\n      const prefix = content.substring(0, this.pos);\n      const suffix = content.substring(this.pos + this.oldText.length);\n      const text = content.substring(this.pos, this.pos + this.oldText.length);\n\n      if (text !== this.oldText) {\n        return Promise.reject(\n          new Error(`Invalid replace: \"${text}\" != \"${this.oldText}\".`)\n        );\n      }\n\n      // TODO: throw error if oldText doesn't match removed string.\n      return host.write(this.path, `${prefix}${this.newText}${suffix}`);\n    });\n  }\n}\n\nexport function createReplaceChange(\n  sourceFile: ts.SourceFile,\n  node: ts.Node,\n  oldText: string,\n  newText: string\n): ReplaceChange {\n  return new ReplaceChange(\n    sourceFile.fileName,\n    node.getStart(sourceFile),\n    oldText,\n    newText\n  );\n}\n\nexport function createRemoveChange(\n  sourceFile: ts.SourceFile,\n  node: ts.Node,\n  from = node.getStart(sourceFile),\n  to = node.getEnd()\n): RemoveChange {\n  return new RemoveChange(sourceFile.fileName, from, to);\n}\n\nexport function createChangeRecorder(\n  tree: Tree,\n  path: string,\n  changes: Change[]\n): UpdateRecorder {\n  const recorder = tree.beginUpdate(path);\n  for (const change of changes) {\n    if (change instanceof InsertChange) {\n      recorder.insertLeft(change.pos, change.toAdd);\n    } else if (change instanceof RemoveChange) {\n      recorder.remove(change.pos, change.end - change.pos);\n    } else if (change instanceof ReplaceChange) {\n      recorder.remove(change.pos, change.oldText.length);\n      recorder.insertLeft(change.pos, change.newText);\n    }\n  }\n  return recorder;\n}\n\nexport function commitChanges(tree: Tree, path: string, changes: Change[]) {\n  if (changes.length === 0) {\n    return false;\n  }\n\n  const recorder = createChangeRecorder(tree, path, changes);\n  tree.commitUpdate(recorder);\n  return true;\n}\n"]}