snapshot of https://github.com/tldraw/tldraw.git (main, 2026-09-23; blobs > 131072B omitted)

templates/agent/worker/do/closeAndParseJson.ts

@@ -0,0 +1,72 @@
+/**
+ * JSON helper. Given a potentially incomplete JSON string, return the parsed object.
+ * The string might be missing closing braces, brackets, or other characters like quotation marks.
+ * @param string - The string to parse.
+ * @returns The parsed object.
+ */
+export function closeAndParseJson(string: string) {
+	const stackOfOpenings = []
+
+	// Track openings and closings
+	let i = 0
+	while (i < string.length) {
+		const char = string[i]
+		const lastOpening = stackOfOpenings.at(-1)
+
+		if (char === '"') {
+			// Check if this quote is escaped
+			if (i > 0 && string[i - 1] === '\\') {
+				// This is an escaped quote, skip it
+				i++
+				continue
+			}
+
+			if (lastOpening === '"') {
+				stackOfOpenings.pop()
+			} else {
+				stackOfOpenings.push('"')
+			}
+		}
+
+		if (lastOpening === '"') {
+			i++
+			continue
+		}
+
+		if (char === '{' || char === '[') {
+			stackOfOpenings.push(char)
+		}
+
+		if (char === '}' && lastOpening === '{') {
+			stackOfOpenings.pop()
+		}
+
+		if (char === ']' && lastOpening === '[') {
+			stackOfOpenings.pop()
+		}
+
+		i++
+	}
+
+	// Now close all unclosed openings
+	for (let i = stackOfOpenings.length - 1; i >= 0; i--) {
+		const opening = stackOfOpenings[i]
+		if (opening === '{') {
+			string += '}'
+		}
+
+		if (opening === '[') {
+			string += ']'
+		}
+
+		if (opening === '"') {
+			string += '"'
+		}
+	}
+
+	try {
+		return JSON.parse(string)
+	} catch (_e) {
+		return null
+	}
+}