diff options
Diffstat (limited to 'deps/npm/node_modules/libnpx/node_modules/yargs/lib/argsert.js')
-rw-r--r-- | deps/npm/node_modules/libnpx/node_modules/yargs/lib/argsert.js | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/deps/npm/node_modules/libnpx/node_modules/yargs/lib/argsert.js b/deps/npm/node_modules/libnpx/node_modules/yargs/lib/argsert.js new file mode 100644 index 0000000000..d3e72fce57 --- /dev/null +++ b/deps/npm/node_modules/libnpx/node_modules/yargs/lib/argsert.js @@ -0,0 +1,72 @@ +const command = require('./command')() +const YError = require('./yerror') + +const positionName = ['first', 'second', 'third', 'fourth', 'fifth', 'sixth'] + +module.exports = function (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. + var position = 0 + var 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(function (demanded) { + const arg = args.shift() + const observedType = guessType(arg) + const matchingTypes = demanded.cmd.filter(function (type) { + return type === observedType || type === '*' + }) + if (matchingTypes.length === 0) argumentTypeError(observedType, demanded.cmd, position, false) + position += 1 + }) + + parsed.optional.forEach(function (optional) { + if (args.length === 0) return + const arg = args.shift() + const observedType = guessType(arg) + const matchingTypes = optional.cmd.filter(function (type) { + return 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 + '.') +} |