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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.ssbRefEncRegex = /((?:ssb:\/\/)?(?:[@%&]|%26|%40|%25)(?:[A-Za-z0-9\/+]|%2[fF]|%2[bB]){43}(?:=|%3[dD])\.[\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
}
var html = el.outerHTML || String(el)
if (el.nodeName === 'html') html = '<!doctype html>' + html + '\n'
return html
}
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.toLink = function (link) {
return typeof link === 'string' ? {link: link} : link
}
u.linkDest = function (link) {
return typeof link === 'string' ? link : link && link.link || link
}
u.toArray = function (x) {
return x == null ? [] : Array.isArray(x) ? x : [x]
}
u.fromArray = function (arr) {
return Array.isArray(arr) && arr.length === 1 ? arr[0] : arr
}
u.toLinkArray = function (x) {
return u.toArray(x).map(u.toLink).filter(u.linkDest)
}
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.extractRefs = function (str) {
var ids = []
String(str).replace(u.ssbRefRegex, function (id) {
ids.push(id)
})
return ids
}
u.extractFeedIds = function (str) {
return u.extractRefs(str).filter(function (ref) {
return ref[0] === '@'
})
}
u.extractBlobIds = function (str) {
return u.extractRefs(str).filter(function (ref) {
return ref[0] === '&'
})
}
u.isMsgReadable = function (msg) {
var c = msg && msg.value && msg.value.content
return typeof c === 'object' && c !== null
}
u.isMsgEncrypted = function (msg) {
var c = msg && msg.value.content
return typeof c === 'string'
}
u.pullConcat = function (cb) {
return pull.collect(function (err, bufs) {
if (err) return cb(err)
cb(null, Buffer.concat(bufs))
})
}
u.customError = function (name) {
return function (message) {
var error = new Error(message)
error.name = name
error.stack = error.stack.replace(/^ at .*\n/m, '')
return error
}
}
u.escapeHTML = function (html) {
return html.toString('utf8')
.replace(/</g, '<')
.replace(/>/g, '>')
}
u.pullSlice = function (start, end) {
if (end == null) end = Infinity
var offset = 0
return function (read) {
return function (abort, cb) {
if (abort) read(abort, cb)
else if (offset >= end) read(true, function (err) {
cb(err || true)
})
else if (offset < start) read(null, function next(err, data) {
if (err) return cb(err)
offset += data.length
if (offset <= start) read(null, next)
else if (offset < end) cb(null,
data.slice(data.length - (offset - start)))
else cb(null, data.slice(data.length - (offset - start),
data.length - (offset - end)))
})
else read(null, function (err, data) {
if (err) return cb(err)
offset += data.length
if (offset <= end) cb(null, data)
else cb(null, data.slice(0, data.length - (offset - end)))
})
}
}
}
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