53 lines
1.1 KiB
JavaScript
53 lines
1.1 KiB
JavaScript
var reFirstKey = /^[^\[]*/
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var reDigitPath = /^\[(\d+)\]/
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var reNormalPath = /^\[([^\]]+)\]/
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function parsePath (key) {
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function failure () {
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return [{ type: 'object', key: key, last: true }]
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}
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var firstKey = reFirstKey.exec(key)[0]
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if (!firstKey) return failure()
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var len = key.length
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var pos = firstKey.length
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var tail = { type: 'object', key: firstKey }
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var steps = [tail]
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while (pos < len) {
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var m
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if (key[pos] === '[' && key[pos + 1] === ']') {
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pos += 2
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tail.append = true
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if (pos !== len) return failure()
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continue
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}
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m = reDigitPath.exec(key.substring(pos))
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if (m !== null) {
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pos += m[0].length
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tail.nextType = 'array'
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tail = { type: 'array', key: parseInt(m[1], 10) }
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steps.push(tail)
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continue
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}
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m = reNormalPath.exec(key.substring(pos))
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if (m !== null) {
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pos += m[0].length
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tail.nextType = 'object'
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tail = { type: 'object', key: m[1] }
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steps.push(tail)
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continue
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}
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return failure()
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}
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tail.last = true
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return steps
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}
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module.exports = parsePath
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