| 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}.`); |
| } |