@angular/core
Version:
Angular - the core framework
78 lines • 13.2 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { RuntimeError } from './error_code';
import { TVIEW } from './interfaces/view';
import { INTERPOLATION_DELIMITER } from './util/misc_utils';
/** Called when there are multiple component selectors that match a given node */
export function throwMultipleComponentError(tNode) {
throw new RuntimeError("300" /* MULTIPLE_COMPONENTS_MATCH */, `Multiple components match node with tagname ${tNode.value}`);
}
/** Throws an ExpressionChangedAfterChecked error if checkNoChanges mode is on. */
export function throwErrorIfNoChangesMode(creationMode, oldValue, currValue, propName) {
const field = propName ? ` for '${propName}'` : '';
let msg = `ExpressionChangedAfterItHasBeenCheckedError: Expression has changed after it was checked. Previous value${field}: '${oldValue}'. Current value: '${currValue}'.`;
if (creationMode) {
msg +=
` It seems like the view has been created after its parent and its children have been dirty checked.` +
` Has it been created in a change detection hook?`;
}
// TODO: include debug context, see `viewDebugError` function in
// `packages/core/src/view/errors.ts` for reference.
throw new RuntimeError("100" /* EXPRESSION_CHANGED_AFTER_CHECKED */, msg);
}
function constructDetailsForInterpolation(lView, rootIndex, expressionIndex, meta, changedValue) {
const [propName, prefix, ...chunks] = meta.split(INTERPOLATION_DELIMITER);
let oldValue = prefix, newValue = prefix;
for (let i = 0; i < chunks.length; i++) {
const slotIdx = rootIndex + i;
oldValue += `${lView[slotIdx]}${chunks[i]}`;
newValue += `${slotIdx === expressionIndex ? changedValue : lView[slotIdx]}${chunks[i]}`;
}
return { propName, oldValue, newValue };
}
/**
* Constructs an object that contains details for the ExpressionChangedAfterItHasBeenCheckedError:
* - property name (for property bindings or interpolations)
* - old and new values, enriched using information from metadata
*
* More information on the metadata storage format can be found in `storePropertyBindingMetadata`
* function description.
*/
export function getExpressionChangedErrorDetails(lView, bindingIndex, oldValue, newValue) {
const tData = lView[TVIEW].data;
const metadata = tData[bindingIndex];
if (typeof metadata === 'string') {
// metadata for property interpolation
if (metadata.indexOf(INTERPOLATION_DELIMITER) > -1) {
return constructDetailsForInterpolation(lView, bindingIndex, bindingIndex, metadata, newValue);
}
// metadata for property binding
return { propName: metadata, oldValue, newValue };
}
// metadata is not available for this expression, check if this expression is a part of the
// property interpolation by going from the current binding index left and look for a string that
// contains INTERPOLATION_DELIMITER, the layout in tView.data for this case will look like this:
// [..., 'id�Prefix � and � suffix', null, null, null, ...]
if (metadata === null) {
let idx = bindingIndex - 1;
while (typeof tData[idx] !== 'string' && tData[idx + 1] === null) {
idx--;
}
const meta = tData[idx];
if (typeof meta === 'string') {
const matches = meta.match(new RegExp(INTERPOLATION_DELIMITER, 'g'));
// first interpolation delimiter separates property name from interpolation parts (in case of
// property interpolations), so we subtract one from total number of found delimiters
if (matches && (matches.length - 1) > bindingIndex - idx) {
return constructDetailsForInterpolation(lView, idx, bindingIndex, meta, newValue);
}
}
}
return { propName: undefined, oldValue, newValue };
}
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Previous value${\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 RuntimeError(RuntimeErrorCode.EXPRESSION_CHANGED_AFTER_CHECKED, 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"]}