8ecda94899
The errors produced when error were encountered while interpreting the content of a directive was often incomprehencible. With this change these kind of error messages should be easier to understand and diagnose. PR Close #20459
61 lines
1.8 KiB
TypeScript
61 lines
1.8 KiB
TypeScript
/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {syntaxError} from '../util';
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export interface Position {
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fileName: string;
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line: number;
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column: number;
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}
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export interface FormattedMessageChain {
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message: string;
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position?: Position;
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next?: FormattedMessageChain;
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}
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export type FormattedError = Error & {
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chain: FormattedMessageChain;
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position?: Position;
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};
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const FORMATTED_MESSAGE = 'ngFormattedMessage';
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function indentStr(level: number): string {
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if (level <= 0) return '';
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if (level < 6) return ['', ' ', ' ', ' ', ' ', ' '][level];
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const half = indentStr(Math.floor(level / 2));
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return half + half + (level % 2 === 1 ? ' ' : '');
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}
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function formatChain(chain: FormattedMessageChain | undefined, indent: number = 0): string {
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if (!chain) return '';
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const position = chain.position ?
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`${chain.position.fileName}(${chain.position.line+1},${chain.position.column+1})` :
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'';
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const prefix = position && indent === 0 ? `${position}: ` : '';
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const postfix = position && indent !== 0 ? ` at ${position}` : '';
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const message = `${prefix}${chain.message}${postfix}`;
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return `${indentStr(indent)}${message}${(chain.next && ('\n' + formatChain(chain.next, indent + 2))) || ''}`;
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}
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export function formattedError(chain: FormattedMessageChain): FormattedError {
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const message = formatChain(chain) + '.';
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const error = syntaxError(message) as FormattedError;
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(error as any)[FORMATTED_MESSAGE] = true;
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error.chain = chain;
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error.position = chain.position;
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return error;
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}
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export function isFormattedError(error: Error): error is FormattedError {
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return !!(error as any)[FORMATTED_MESSAGE];
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}
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