| import { YError } from './yerror.js'; | |
| import { parseCommand } from './parse-command.js'; | |
| const positionName = ['first', 'second', 'third', 'fourth', 'fifth', 'sixth']; | |
| export function argsert(arg1, arg2, arg3) { | |
| function parseArgs() { | |
| return typeof arg1 === 'object' | |
| ? [{ demanded: [], optional: [] }, arg1, arg2] | |
| : [ | |
| parseCommand(`cmd ${arg1}`), | |
| arg2, | |
| arg3, | |
| ]; | |
| } | |
| try { | |
| let position = 0; | |
| const [parsed, callerArguments, _length] = parseArgs(); | |
| const args = [].slice.call(callerArguments); | |
| while (args.length && args[args.length - 1] === undefined) | |
| args.pop(); | |
| const 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); | |
| 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); | |
| 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) { | |
| throw new YError(`Invalid ${positionName[position] || 'manyith'} argument. Expected ${allowedTypes.join(' or ')} but received ${observedType}.`); | |
| } | |