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@angular/core

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Angular - the core framework

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import { stringify } from '../util/stringify'; import { TVIEW } from './interfaces/view'; import { INTERPOLATION_DELIMITER } from './util/misc_utils'; /** Called when directives inject each other (creating a circular dependency) */ export function throwCyclicDependencyError(token) { throw new Error(`Cannot instantiate cyclic dependency! ${token}`); } /** Called when there are multiple component selectors that match a given node */ export function throwMultipleComponentError(tNode) { throw new Error(`Multiple components match node with tagname ${tNode.tagName}`); } export function throwMixedMultiProviderError() { throw new Error(`Cannot mix multi providers and regular providers`); } export function throwInvalidProviderError(ngModuleType, providers, provider) { let ngModuleDetail = ''; if (ngModuleType && providers) { const providerDetail = providers.map(v => v == provider ? '?' + provider + '?' : '...'); ngModuleDetail = ` - only instances of Provider and Type are allowed, got: [${providerDetail.join(', ')}]`; } throw new Error(`Invalid provider for the NgModule '${stringify(ngModuleType)}'` + ngModuleDetail); } /** Throws an ExpressionChangedAfterChecked error if checkNoChanges mode is on. */ export function throwErrorIfNoChangesMode(creationMode, oldValue, currValue, propName) { const field = propName ? ` for '${propName}'` : ''; let msg = `ExpressionChangedAfterItHasBeenCheckedError: Expression has changed after it was checked. Previous value${field}: '${oldValue}'. Current value: '${currValue}'.`; if (creationMode) { msg += ` It seems like the view has been created after its parent and its children have been dirty checked.` + ` Has it been created in a change detection hook?`; } // TODO: include debug context, see `viewDebugError` function in // `packages/core/src/view/errors.ts` for reference. throw new Error(msg); } function constructDetailsForInterpolation(lView, rootIndex, expressionIndex, meta, changedValue) { const [propName, prefix, ...chunks] = meta.split(INTERPOLATION_DELIMITER); let oldValue = prefix, newValue = prefix; for (let i = 0; i < chunks.length; i++) { const slotIdx = rootIndex + i; oldValue += `${lView[slotIdx]}${chunks[i]}`; newValue += `${slotIdx === expressionIndex ? changedValue : lView[slotIdx]}${chunks[i]}`; } return { propName, oldValue, newValue }; } /** * Constructs an object that contains details for the ExpressionChangedAfterItHasBeenCheckedError: * - property name (for property bindings or interpolations) * - old and new values, enriched using information from metadata * * More information on the metadata storage format can be found in `storePropertyBindingMetadata` * function description. */ export function getExpressionChangedErrorDetails(lView, bindingIndex, oldValue, newValue) { const tData = lView[TVIEW].data; const metadata = tData[bindingIndex]; if (typeof metadata === 'string') { // metadata for property interpolation if (metadata.indexOf(INTERPOLATION_DELIMITER) > -1) { return constructDetailsForInterpolation(lView, bindingIndex, bindingIndex, metadata, newValue); } // metadata for property binding return { propName: metadata, oldValue, newValue }; } // metadata is not available for this expression, check if this expression is a part of the // property interpolation by going from the current binding index left and look for a string that // contains INTERPOLATION_DELIMITER, the layout in tView.data for this case will look like this: // [..., 'id�Prefix � and � suffix', null, null, null, ...] if (metadata === null) { let idx = bindingIndex - 1; while (typeof tData[idx] !== 'string' && tData[idx + 1] === null) { idx--; } const meta = tData[idx]; if (typeof meta === 'string') { const matches = meta.match(new RegExp(INTERPOLATION_DELIMITER, 'g')); // first interpolation delimiter separates property name from interpolation parts (in case of // property interpolations), so we subtract one from total number of found delimiters if (matches && (matches.length - 1) > bindingIndex - idx) { return constructDetailsForInterpolation(lView, idx, bindingIndex, meta, newValue); 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'?' + provider + '?' : '...');\n    ngModuleDetail =\n        ` - only instances of Provider and Type are allowed, got: [${providerDetail.join(', ')}]`;\n  }\n\n  throw new Error(\n      `Invalid provider for the NgModule '${stringify(ngModuleType)}'` + ngModuleDetail);\n}\n\n/** Throws an ExpressionChangedAfterChecked error if checkNoChanges mode is on. */\nexport function throwErrorIfNoChangesMode(\n    creationMode: boolean, oldValue: any, currValue: any, propName?: string): never|void {\n  const field = propName ? ` for '${propName}'` : '';\n  let msg =\n      `ExpressionChangedAfterItHasBeenCheckedError: Expression has changed after it was checked. Previous value${\n          field}: '${oldValue}'. Current value: '${currValue}'.`;\n  if (creationMode) {\n    msg +=\n        ` It seems like the view has been created after its parent and its children have been dirty checked.` +\n        ` Has it been created in a change detection hook?`;\n  }\n  // TODO: include debug context, see `viewDebugError` function in\n  // `packages/core/src/view/errors.ts` for reference.\n  throw new Error(msg);\n}\n\nfunction constructDetailsForInterpolation(\n    lView: LView, rootIndex: number, expressionIndex: number, meta: string, changedValue: any) {\n  const [propName, prefix, ...chunks] = meta.split(INTERPOLATION_DELIMITER);\n  let oldValue = prefix, newValue = prefix;\n  for (let i = 0; i < chunks.length; i++) {\n    const slotIdx = rootIndex + i;\n    oldValue += `${lView[slotIdx]}${chunks[i]}`;\n    newValue += `${slotIdx === expressionIndex ? changedValue : lView[slotIdx]}${chunks[i]}`;\n  }\n  return {propName, oldValue, newValue};\n}\n\n/**\n * Constructs an object that contains details for the ExpressionChangedAfterItHasBeenCheckedError:\n * - property name (for property bindings or interpolations)\n * - old and new values, enriched using information from metadata\n *\n * More information on the metadata storage format can be found in `storePropertyBindingMetadata`\n * function description.\n */\nexport function getExpressionChangedErrorDetails(\n    lView: LView, bindingIndex: number, oldValue: any,\n    newValue: any): {propName?: string, oldValue: any, newValue: any} {\n  const tData = lView[TVIEW].data;\n  const metadata = tData[bindingIndex];\n\n  if (typeof metadata === 'string') {\n    // metadata for property interpolation\n    if (metadata.indexOf(INTERPOLATION_DELIMITER) > -1) {\n      return constructDetailsForInterpolation(\n          lView, bindingIndex, bindingIndex, metadata, newValue);\n    }\n    // metadata for property binding\n    return {propName: metadata, oldValue, newValue};\n  }\n\n  // metadata is not available for this expression, check if this expression is a part of the\n  // property interpolation by going from the current binding index left and look for a string that\n  // contains INTERPOLATION_DELIMITER, the layout in tView.data for this case will look like this:\n  // [..., 'id�Prefix � and � suffix', null, null, null, ...]\n  if (metadata === null) {\n    let idx = bindingIndex - 1;\n    while (typeof tData[idx] !== 'string' && tData[idx + 1] === null) {\n      idx--;\n    }\n    const meta = tData[idx];\n    if (typeof meta === 'string') {\n      const matches = meta.match(new RegExp(INTERPOLATION_DELIMITER, 'g'));\n      // first interpolation delimiter separates property name from interpolation parts (in case of\n      // property interpolations), so we subtract one from total number of found delimiters\n      if (matches && (matches.length - 1) > bindingIndex - idx) {\n        return constructDetailsForInterpolation(lView, idx, bindingIndex, meta, newValue);\n      }\n    }\n  }\n  return {propName: undefined, oldValue, newValue};\n}\n"]}