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