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//===--------------- OptionParsing.swift - Swift Option Parser ------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2019 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
import protocol TSCBasic.DiagnosticData
public enum OptionParseError : Error, Equatable, DiagnosticData {
case unknownOption(index: Int, argument: String)
case missingArgument(index: Int, argument: String)
case unsupportedOption(index: Int, argument: String, option: Option, currentDriverKind: DriverKind)
public var description: String {
switch self {
case let .unknownOption(index: _, argument: arg):
return "unknown argument: '\(arg)'"
case let .missingArgument(index: _, argument: arg):
return "missing argument value for '\(arg)'"
case let .unsupportedOption(index: _, argument: arg, option: option, currentDriverKind: driverKind):
// TODO: This logic to choose the recommended kind is copied from the C++
// driver and could be improved.
let recommendedDriverKind: DriverKind = option.attributes.contains(.noBatch) ? .interactive : .batch
return "option '\(arg)' is not supported by '\(driverKind.usage)'; did you mean to use '\(recommendedDriverKind.usage)'?"
}
}
}
extension OptionTable {
/// Parse the given command-line arguments into a set of options.
///
/// Throws an error if the command line contains any errors.
public func parse(_ arguments: [String],
for driverKind: DriverKind, delayThrows: Bool = false) throws -> ParsedOptions {
var trie = PrefixTrie<Option>()
// Add all options, ignoring the .noDriver ones
for opt in options where !opt.attributes.contains(.noDriver) {
trie[opt.spelling] = opt
}
var parsedOptions = ParsedOptions()
var seenDashE = false
var index = arguments.startIndex
while index < arguments.endIndex {
// Capture the next argument.
let argument = arguments[index]
index += 1
// Ignore empty arguments.
if argument.isEmpty {
continue
}
// If this is not a flag, record it as an input.
if argument == "-" || argument.first! != "-" {
// If we've seen -e, this argument and all remaining ones are arguments to the -e script.
if driverKind == .interactive && seenDashE {
parsedOptions.addOption(.DASHDASH, argument: .multiple(Array(arguments[(index-1)...])))
break
}
parsedOptions.addInput(argument)
// In interactive mode, synthesize a "--" argument for all args after the first input.
if driverKind == .interactive && index < arguments.endIndex {
parsedOptions.addOption(.DASHDASH, argument: .multiple(Array(arguments[index...])))
break
}
continue
}
// Match to an option, identified by key. Note that this is a prefix
// match -- if the option is a `.flag`, we'll explicitly check to see if
// there's an unmatched suffix at the end, and pop an error. Otherwise,
// we'll treat the unmatched suffix as the argument to the option.
guard let option = trie[argument] else {
if delayThrows {
parsedOptions.addUnknownFlag(index: index - 1, argument: argument)
continue
} else {
throw OptionParseError.unknownOption(index: index - 1, argument: argument)
}
}
let verifyOptionIsAcceptedByDriverKind = {
// Make sure this option is supported by the current driver kind.
guard option.isAccepted(by: driverKind) else {
throw OptionParseError.unsupportedOption(
index: index - 1, argument: argument, option: option,
currentDriverKind: driverKind)
}
}
if option == .e {
seenDashE = true
}
// Translate the argument
switch option.kind {
case .input:
parsedOptions.addOption(option, argument: .single(argument))
case .commaJoined:
// Comma-separated list of arguments follows the option spelling.
try verifyOptionIsAcceptedByDriverKind()
let rest = argument.dropFirst(option.spelling.count)
parsedOptions.addOption(
option,
argument: .multiple(rest.split(separator: ",").map { String($0) }))
case .flag:
// Make sure there was no extra text.
if argument != option.spelling {
throw OptionParseError.unknownOption(
index: index - 1, argument: argument)
}
try verifyOptionIsAcceptedByDriverKind()
parsedOptions.addOption(option, argument: .none)
case .joined:
// Argument text follows the option spelling.
try verifyOptionIsAcceptedByDriverKind()
parsedOptions.addOption(
option,
argument: .single(String(argument.dropFirst(option.spelling.count))))
case .joinedOrSeparate:
// Argument text follows the option spelling.
try verifyOptionIsAcceptedByDriverKind()
let arg = argument.dropFirst(option.spelling.count)
if !arg.isEmpty {
parsedOptions.addOption(option, argument: .single(String(arg)))
break
}
if index == arguments.endIndex {
throw OptionParseError.missingArgument(
index: index - 1, argument: argument)
}
parsedOptions.addOption(option, argument: .single(arguments[index]))
index += 1
case .remaining:
if argument != option.spelling {
throw OptionParseError.unknownOption(
index: index - 1, argument: argument)
}
parsedOptions.addOption(.DASHDASH, argument: .multiple(Array()))
arguments[index...].map { String($0) }.forEach { parsedOptions.addInput($0) }
index = arguments.endIndex
case .separate:
if argument != option.spelling {
throw OptionParseError.unknownOption(
index: index - 1, argument: argument)
}
try verifyOptionIsAcceptedByDriverKind()
if index == arguments.endIndex {
throw OptionParseError.missingArgument(
index: index - 1, argument: argument)
}
parsedOptions.addOption(option, argument: .single(arguments[index]))
index += 1
case .multiArg:
if argument != option.spelling {
throw OptionParseError.unknownOption(
index: index - 1, argument: argument)
}
let endIdx = index + Int(option.numArgs)
if endIdx > arguments.endIndex {
throw OptionParseError.missingArgument(
index: index - 1, argument: argument)
}
parsedOptions.addOption(option, argument: .multiple(Array()))
arguments[index..<endIdx].map { String($0) }.forEach { parsedOptions.addInput($0) }
index = endIdx
}
}
parsedOptions.buildIndex()
return parsedOptions
}
}
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