Fix invalid JSON escapes errors

Author: RedCMD

src/DiagnosticCollection.ts

@@ -4,7 +4,7 @@ import * as vscodeOniguruma from 'vscode-oniguruma';
 import * as textmateOnigmo from "./Onigmo/Onigmo";
 import * as PCRE from '@syntropiq/libpcre-ts';
 import * as onigurumaToES from 'oniguruma-to-es';
-import { closeEnoughQuestionMark, DocumentSelector, getPackageJSON, stringify, wagnerFischer } from "./extension";
+import { closeEnoughQuestionMark, DocumentSelector, getPackageJSON, JSONParseStringRelaxed, stringify, wagnerFischer } from "./extension";
 import { getLastNode, getTrees, queryNode, toRange, trees } from "./TreeSitter";
 import { ignoreDiagnosticsUnusedRepos } from "./Providers/CodeActionsProvider";
 import { unicodeproperties } from "./UNICODE_PROPERTIES";
@@ -407,7 +407,7 @@ async function diagnosticsOnigurumaRegexErrors(diagnostics: vscode.Diagnostic[],
 
 		let groupCaptures!: webTreeSitter.QueryCapture[];
 
-		const regex: string = JSON.parse(`"${text}"`);
+		const regex: string = JSONParseStringRelaxed(text);
 		const hasBackreferences = (key.text == 'end' || key.text == 'while') && /\\[0-9]/.test(regex);
 		const beginNode = hasBackreferences ? getLastNode(regexNode.parent!.parent!, 'begin')?.childForFieldName('regex') : null;
 		if (beginNode) {

src/Providers/CodeActionsProvider.ts

@@ -1,7 +1,7 @@
 import * as vscode from 'vscode';
 import * as webTreeSitter from 'web-tree-sitter';
 import * as optimizer from 'oniguruma-parser-cjs/optimizer';
-import { closeEnoughQuestionMark, stringify, wagnerFischer } from "../extension";
+import { closeEnoughQuestionMark, JSONParseStringRelaxed, stringify, wagnerFischer } from "../extension";
 import { getTrees, queryNode, toRange } from "../TreeSitter";
 import { debouncedDiagnostics } from "../DiagnosticCollection";
 import { unicodeproperties, UNICODE_PROPERTIES } from "../UNICODE_PROPERTIES";
@@ -223,7 +223,7 @@ async function optimizeRegex(edit: vscode.WorkspaceEdit, regexNode: webTreeSitte
 	const range = toRange(regexNode);
 
 	try {
-		const text: string = JSON.parse(`"${regexNode.text}"`);
+		const text: string = JSONParseStringRelaxed(regexNode.text);
 
 		const optimized = optimizer.optimize(text, {
 			rules: {

src/Providers/HoverProvider.ts

@@ -1,6 +1,7 @@
 import * as vscode from 'vscode';
 import * as webTreeSitter from 'web-tree-sitter';
 import * as onigurumaToES from 'oniguruma-to-es';
+import { JSONParseStringRelaxed } from "../extension";
 import { getTrees, queryNode, toPoint, toRange, trees } from "../TreeSitter";
 
 
@@ -70,7 +71,7 @@ export const HoverProvider: vscode.HoverProvider = {
 		try {
 			const regexNode = hoverNode.parent?.childForFieldName('regex');
 			if (regexNode?.text) {
-				const text: string = JSON.parse(`"${regexNode.text}"`);
+				const text: string = JSONParseStringRelaxed(regexNode.text);
 				const options: onigurumaToES.ToRegExpOptions = {
 					accuracy: 'default',
 					avoidSubclass: true,

src/extension.ts

@@ -109,6 +109,27 @@ export function stringify(this: any, key: string, value: any): any {
 	return value;
 }
 
+export function JSONParseStringRelaxed(string: string) {
+	return string.replaceAll(
+		/\\u[0-9A-Fa-f]{1,4}|\\.?/g,
+		(escapeString) => {
+			const escapeChar = escapeString.charAt(1);
+			switch (escapeChar) {
+				case 'u': // unicode \u0000
+					const hexadecimalString = escapeString.substring(2, 6);
+					const hexadecimalCode = parseInt(hexadecimalString, 16);
+					return String.fromCodePoint(hexadecimalCode);
+				case 'b': return '\b'; // backspace
+				case 'f': return '\f'; // form feed
+				case 'n': return '\n'; // newline
+				case 'r': return '\r'; // carriage return
+				case 't': return '\t'; // tab
+				default:
+					return escapeChar;
+			}
+		}
+	);
+}
 
 export function closeEnoughQuestionMark(distance: number, text: string): boolean {
 	if (typeof distance != 'number') {