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parse.js
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parse.js
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export const parse = (str, {
open = '[',
close = ']',
escape = '`'
} = {}) => {
const parents = []
let parent = {subvalues: []}, buffer = '', isEscaped = false
for (let i = 0; i < str.length; ++i) {
const c = str[i]
if (isEscaped) {
if (c === escape || c === open || c === close) {
buffer += c
isEscaped = false
} else throw Error('Invalid escape!')
} else if (c === escape) {isEscaped = true}
else if (c === open) {
const value = {subvalues: []}
parent.subvalues.push({prefix: buffer, value})
parents.push(parent)
parent = value
buffer = ''
} else if (c === close) {
parent.suffix = buffer
buffer = ''
if (parents.length < 1) throw Error('Unexpected close!')
parent = parents.pop()
} else {buffer += c}
}
if (isEscaped || parents.length > 0) throw Error('Unexpected end!')
parent.suffix = buffer
parent.open = open
parent.close = close
parent.escape = escape
return parent
}