54 lines
1.2 KiB
TypeScript
54 lines
1.2 KiB
TypeScript
export function parseJsObject(str: string, offset = 0) {
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let i = offset
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const len = str.length
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let start = -1
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let end = -1
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const depth = {
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'{': 0,
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'[': 0,
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}
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const possibleQuotes = {
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'"': true,
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'\'': true,
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'`': true,
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}
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let inQuote: string | null = null
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let escapeNextQuote = false
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while (i < len) {
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const char = str[i]
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if (char in possibleQuotes && !escapeNextQuote) {
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if (inQuote === null) {
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inQuote = char
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} else if (char === inQuote) {
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inQuote = null
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}
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} else if (inQuote != null) {
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escapeNextQuote = char === '\\' && !escapeNextQuote
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} else if (inQuote == null && char in depth) {
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if (start === -1) {
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start = i
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}
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depth[char] += 1
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} else if (inQuote == null && (
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char === '}' || char === ']'
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)) {
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if (char === '}') depth['{'] -= 1
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if (char === ']') depth['['] -= 1
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if (depth['{'] === 0 && depth['['] === 0) {
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end = i + 1
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break
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}
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}
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i += 1
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}
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if (start === -1 && end === -1) return null
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if (depth['{'] !== 0 || depth['['] !== 0) throw new SyntaxError('Mismatched brackets')
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if (inQuote) throw new SyntaxError('Unclosed string')
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return str.substring(start, end)
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}
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