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var pull = require('pull-stream')
var cat = require('pull-cat')
var h = require('hyperscript')
var u = exports
u.ssbRefRegex = /((?:@|%|&|ssb:\/\/%)[A-Za-z0-9\/+]{43}=\.[\w\d]+)/g
u.isRef = function (str) {
if (!str) return false
u.ssbRefRegex.lastIndex = 0
return u.ssbRefRegex.test(str)
}
u.readNext = function (fn) {
var next
return function (end, cb) {
if (next) return next(end, cb)
fn(function (err, _next) {
if (err) return cb(err)
next = _next
next(null, cb)
})
}
}
u.pullReverse = function () {
return function (read) {
return u.readNext(function (cb) {
pull(read, pull.collect(function (err, items) {
cb(err, items && pull.values(items.reverse()))
}))
})
}
}
u.toHTML = function (el) {
if (!el) return ''
if (typeof el === 'string' || Array.isArray(el)) {
return h('div', el).innerHTML
}
return el.outerHTML || String(el)
}
u.hyperwrap = function (fn) {
var token = '__HYPERWRAP_' + Math.random() + '__'
return function (read) {
return u.readNext(function (cb) {
fn(token, function (err, el) {
if (err) return cb(err)
var parts = u.toHTML(el).split(token)
switch (parts.length) {
case 0: return cb(null, pull.empty())
case 1: return cb(null, pull.once(parts[0]))
case 2: return cb(null,
cat([pull.once(parts[0]), read, pull.once(parts[1])]))
default: return cb(new Error('duplicate wrap'))
}
})
})
}
}
u.linkDest = function (link) {
return typeof link === 'string' ? link : link && link.link || link
}
u.toArray = function (x) {
return !x ? [] : Array.isArray(x) ? x : [x]
}
u.fromArray = function (arr) {
return Array.isArray(arr) && arr.length === 1 ? arr[0] : arr
}
u.renderError = function(err) {
return h('div.error',
h('h3', err.name),
h('pre', err.stack))
}
u.pullLength = function (cb) {
var len = 0
return pull.through(function (data) {
len += data.length
}, function (err) {
cb(err, len)
})
}
u.tryDecodeJSON = function (json) {
try {
return JSON.parse(json)
} catch(e) {
return null
}
}
u.extractFeedIds = function (str) {
var ids = []
String(str).replace(u.ssbRefRegex, function (id) {
ids.push(id)
})
return ids
}
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