67 lines
2.3 KiB
JavaScript
67 lines
2.3 KiB
JavaScript
'use strict'
|
|
const command = require('./command')()
|
|
const YError = require('./yerror')
|
|
|
|
const positionName = ['first', 'second', 'third', 'fourth', 'fifth', 'sixth']
|
|
|
|
module.exports = function argsert (expected, callerArguments, length) {
|
|
// TODO: should this eventually raise an exception.
|
|
try {
|
|
// preface the argument description with "cmd", so
|
|
// that we can run it through yargs' command parser.
|
|
let position = 0
|
|
let parsed = {demanded: [], optional: []}
|
|
if (typeof expected === 'object') {
|
|
length = callerArguments
|
|
callerArguments = expected
|
|
} else {
|
|
parsed = command.parseCommand(`cmd ${expected}`)
|
|
}
|
|
const args = [].slice.call(callerArguments)
|
|
|
|
while (args.length && args[args.length - 1] === undefined) args.pop()
|
|
length = length || args.length
|
|
|
|
if (length < parsed.demanded.length) {
|
|
throw new YError(`Not enough arguments provided. Expected ${parsed.demanded.length} but received ${args.length}.`)
|
|
}
|
|
|
|
const totalCommands = parsed.demanded.length + parsed.optional.length
|
|
if (length > totalCommands) {
|
|
throw new YError(`Too many arguments provided. Expected max ${totalCommands} but received ${length}.`)
|
|
}
|
|
|
|
parsed.demanded.forEach((demanded) => {
|
|
const arg = args.shift()
|
|
const observedType = guessType(arg)
|
|
const matchingTypes = demanded.cmd.filter(type => type === observedType || type === '*')
|
|
if (matchingTypes.length === 0) argumentTypeError(observedType, demanded.cmd, position, false)
|
|
position += 1
|
|
})
|
|
|
|
parsed.optional.forEach((optional) => {
|
|
if (args.length === 0) return
|
|
const arg = args.shift()
|
|
const observedType = guessType(arg)
|
|
const matchingTypes = optional.cmd.filter(type => type === observedType || type === '*')
|
|
if (matchingTypes.length === 0) argumentTypeError(observedType, optional.cmd, position, true)
|
|
position += 1
|
|
})
|
|
} catch (err) {
|
|
console.warn(err.stack)
|
|
}
|
|
}
|
|
|
|
function guessType (arg) {
|
|
if (Array.isArray(arg)) {
|
|
return 'array'
|
|
} else if (arg === null) {
|
|
return 'null'
|
|
}
|
|
return typeof arg
|
|
}
|
|
|
|
function argumentTypeError (observedType, allowedTypes, position, optional) {
|
|
throw new YError(`Invalid ${positionName[position] || 'manyith'} argument. Expected ${allowedTypes.join(' or ')} but received ${observedType}.`)
|
|
}
|